/* Peking University Research Group Website - English Optimized CSS with Research Images Support */

/* CSS Variables Definition - PKU Theme */
:root {
    /* PKU Main Color System */
    --pku-red: #c41e3a;
    --pku-red-dark: #a01729;
    --pku-red-light: #d63651;
    --pku-gold: #ffd700;
    --pku-blue: #1e3a8a;
    --pku-blue-light: #3b82f6;
    --primary-color: var(--pku-red);
    --primary-hover: var(--pku-red-dark);
    --primary-light: var(--pku-red-light);
    --secondary-color: var(--pku-blue);
    --accent-color: var(--pku-gold);
    
    /* Modern Color System */
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --danger-color: #ef4444;
    --info-color: #06b6d4;
    
    /* Text Color System */
    --text-primary: #111827;
    --text-secondary: #374151;
    --text-muted: #6b7280;
    --text-light: #9ca3af;
    --text-white: #ffffff;
    
    /* Background Color System */
    --bg-primary: #ffffff;
    --bg-secondary: #f9fafb;
    --bg-tertiary: #f3f4f6;
    --bg-muted: #e5e7eb;
    --bg-overlay: rgba(0, 0, 0, 0.5);
    --bg-glass: rgba(255, 255, 255, 0.8);
    
    /* Border Color System */
    --border-light: #e5e7eb;
    --border-medium: #d1d5db;
    --border-dark: #9ca3af;
    
    /* Gradient Color System - PKU Theme */
    --gradient-primary: linear-gradient(135deg, var(--pku-red) 0%, var(--pku-red-light) 50%, #ff6b85 100%);
    --gradient-secondary: linear-gradient(135deg, var(--pku-blue) 0%, var(--pku-blue-light) 100%);
    --gradient-warm: linear-gradient(135deg, #fef3c7 0%, var(--pku-gold) 100%);
    --gradient-bg: linear-gradient(135deg, #f9fafb 0%, #ffffff 50%, #f3f4f6 100%);
    --gradient-hero: linear-gradient(135deg, var(--pku-red) 0%, var(--pku-blue) 100%);
    
    /* Shadow System */
    --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    --shadow-primary: 0 10px 40px rgba(196, 30, 58, 0.2);
    --shadow-colored: 0 8px 32px rgba(196, 30, 58, 0.15);
    --shadow-glass: 0 8px 32px 0 rgba(31, 38, 135, 0.37);
    
    /* Border Radius System */
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 20px;
    --radius-2xl: 24px;
    --radius-3xl: 32px;
    --radius-full: 50%;
    
    /* Spacing System */
    --spacing-1: 0.25rem;
    --spacing-2: 0.5rem;
    --spacing-3: 0.75rem;
    --spacing-4: 1rem;
    --spacing-5: 1.25rem;
    --spacing-6: 1.5rem;
    --spacing-8: 2rem;
    --spacing-10: 2.5rem;
    --spacing-12: 3rem;
    --spacing-16: 4rem;
    --spacing-20: 5rem;
    --spacing-24: 6rem;
    --spacing-32: 8rem;
    
    /* Font System */
    --font-sans: 'Inter', 'Segoe UI', -apple-system, BlinkMacSystemFont, 'Roboto', 'Helvetica Neue', Arial, sans-serif;
    
    /* Font Size System */
    --text-xs: 0.75rem;
    --text-sm: 0.875rem;
    --text-base: 1rem;
    --text-lg: 1.125rem;
    --text-xl: 1.25rem;
    --text-2xl: 1.5rem;
    --text-3xl: 1.875rem;
    --text-4xl: 2.25rem;
    --text-5xl: 3rem;
    --text-6xl: 3.75rem;
    
    /* Line Height System */
    --leading-tight: 1.25;
    --leading-normal: 1.5;
    --leading-relaxed: 1.625;
    
    /* Font Weight System */
    --font-light: 300;
    --font-normal: 400;
    --font-medium: 500;
    --font-semibold: 600;
    --font-bold: 700;
    
    /* Transition Animation System */
    --transition-fast: all 0.15s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-normal: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
    
    /* Z-Index System */
    --z-10: 10;
    --z-20: 20;
    --z-30: 30;
    --z-40: 40;
    --z-50: 50;
    --z-modal: 1000;
    --z-fixed: 1050;
}

/* Basic Reset and Global Styles */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    line-height: var(--leading-normal);
    scroll-behavior: smooth;
    scroll-padding-top: 80px;
}

body {
    font-family: var(--font-sans);
    font-size: var(--text-base);
    line-height: var(--leading-normal);
    color: var(--text-primary);

    background: radial-gradient(circle at 25% 25%, rgba(196, 30, 58, 0.03) 1px, transparent 1px), radial-gradient(circle at 75% 75%, rgba(30, 58, 138, 0.03) 1px, transparent 1px), linear-gradient(30deg, transparent 48%, rgba(196, 30, 58, 0.05) 49%, rgba(196, 30, 58, 0.05) 51%, transparent 52%), linear-gradient(150deg, transparent 48%, rgba(30, 58, 138, 0.05) 49%, rgba(30, 58, 138, 0.05) 51%, transparent 52%), linear-gradient(135deg, #f9fafb 0%, #ffffff 50%, #f3f4f6 100%);
    background-size: 60px 60px, 80px 80px, 120px 120px, 140px 140px, 100% 100%;
    background-position: 0 0, 30px 30px, 0 0, 70px 70px, 0 0;

    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

/* 动画定义 */
@keyframes backgroundShift {
    0%, 100% {
        background-position: 0 0, 60px 60px, 0 0, 140px 140px, 0 0;
    }

    50% {
        background-position: 60px 60px, 0 0, 120px 120px, 0 0, 0 0;
    }
}

@keyframes hexagonalFloat {
    0%, 100% {
        transform: translateY(0px) rotate(0deg);
        opacity: 0.8;
    }

    33% {
        transform: translateY(-10px) rotate(2deg);
        opacity: 1;
    }

    66% {
        transform: translateY(-5px) rotate(-1deg);
        opacity: 0.9;
    }
}

@keyframes particleFloat {
    0% {
        transform: translateY(0px);
    }

    100% {
        transform: translateY(-200px);
    }
}

/* Scrollbar Styles */
::-webkit-scrollbar {
    width: 6px;
}

::-webkit-scrollbar-track {
    background: var(--bg-tertiary);
    border-radius: var(--radius-sm);
}

::-webkit-scrollbar-thumb {
    background: var(--primary-color);
    border-radius: var(--radius-sm);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--primary-hover);
}

/* Text Selection Styles */
::selection {
    background: rgba(196, 30, 58, 0.2);
    color: var(--text-primary);
}

/* Focus Styles */
:focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* Container and Layout */
.container {
    min-height: 100vh;
    position: relative;
}

/* Top Navigation Bar */
.top-nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-light);
    z-index: var(--z-50);
    height: 64px;
    display: flex;
    align-items: center;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-6);
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-left {
    display: flex;
    align-items: center;
    gap: var(--spacing-3);
}

.pku-logo {
    font-size: var(--text-2xl);
    color: var(--primary-color);
}

.nav-separator {
    color: var(--text-light);
    font-weight: var(--font-light);
}

.nav-school {
    font-weight: var(--font-semibold);
    color: var(--text-primary);
    font-size: var(--text-base);
}

.nav-right {
    display: flex;
    align-items: center;
}

/* Hidden Admin Login Entry */
.admin-hidden-trigger {
    width: 12px;
    height: 12px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0.3;
    transition: var(--transition-fast);
    padding: var(--spacing-2);
    border-radius: var(--radius-full);
}

.admin-hidden-trigger:hover {
    opacity: 0.8;
    background: rgba(196, 30, 58, 0.1);
}

.hidden-dot {
    width: 4px;
    height: 4px;
    background: var(--text-muted);
    border-radius: var(--radius-full);
    transition: var(--transition-fast);
}

.admin-hidden-trigger:hover .hidden-dot {
    background: var(--primary-color);
    transform: scale(1.5);
}

/* ============= Fixed Admin Status and Panel Button Display Issues ============= */

/* Admin Status Indicator - Hidden by Default */
.admin-status {
    position: fixed;
    top: var(--spacing-5);
    left: var(--spacing-5);
    background: var(--success-color);
    color: var(--text-white);
    padding: var(--spacing-2) var(--spacing-4);
    border-radius: var(--radius-3xl);
    font-size: var(--text-xs);
    font-weight: var(--font-medium);
    z-index: var(--z-50);
    display: none; /* Hidden by default */
    box-shadow: var(--shadow-lg);
    align-items: center;
    gap: var(--spacing-2);
    backdrop-filter: blur(8px);
}

/* Show Admin Status When Logged In */
.admin-status.logged-in {
    display: flex !important;
    animation: slideInLeft 0.3s ease;
}

/* Admin Status Panel Button */
.admin-status button,
#togglePanelBtn {
    margin-left: var(--spacing-2);
    padding: var(--spacing-1) var(--spacing-2);
    font-size: var(--text-xs);
    background: rgba(255, 255, 255, 0.2);
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: var(--radius-sm);
    color: var(--text-white);
    cursor: pointer;
    transition: var(--transition-fast);
    font-family: inherit;
}

.admin-status button:hover,
#togglePanelBtn:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: scale(1.05);
}

/* Tab Admin Panel Button */
.admin-panel-trigger {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-hover)) !important;
    color: var(--text-white) !important;
    border-radius: var(--radius-lg) !important;
    margin-left: var(--spacing-4) !important;
    position: relative;
    display: none !important; /* Hidden by default */
}

/* Show Admin Panel Button When Logged In */
body.admin-logged-in .admin-panel-trigger {
    display: flex !important; /* Show when logged in */
}

.admin-panel-trigger::before {
    content: '';
    position: absolute;
    inset: -2px;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-hover));
    border-radius: var(--radius-lg);
    z-index: -1;
    opacity: 0.3;
    animation: pulse 2s infinite;
}

.admin-panel-trigger:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.admin-panel-trigger.active {
    background: linear-gradient(135deg, var(--primary-hover), var(--primary-color)) !important;
}

/* Body Class-Based Login Status Control */
body.admin-logged-out .admin-status {
    display: none !important;
}

body.admin-logged-out .admin-panel-trigger {
    display: none !important;
}

body.admin-logged-in .admin-status {
    display: flex !important;
}

body.admin-logged-in .admin-panel-trigger {
    display: flex !important;
}

/* ============= Admin Panel Styles Fixed - Anti-Flash Version ============= */

/* Admin Panel - Hidden by Default to Prevent Flash */
.admin-panel {
    /* Basic positioning */
    position: fixed;
    top: 0;
    right: -400px; /* Hidden off-screen by default */
    width: 400px;
    height: 100vh;
    background: var(--bg-primary);
    box-shadow: -5px 0 25px rgba(0, 0, 0, 0.15);
    z-index: var(--z-modal);
    overflow-y: auto;
    border-left: 1px solid var(--border-light);
    
    /* Key: Default hidden to prevent flash */
    display: block;
    visibility: hidden; /* Initially invisible */
    opacity: 0; /* Transparent */
    
    /* Smooth transition effects */
    transition: right 0.3s cubic-bezier(0.4, 0, 0.2, 1), 
                opacity 0.3s ease, 
                visibility 0.3s ease;
}

/* Panel initialized and ready to show (controlled by JavaScript) */
.admin-panel.initialized {
    visibility: visible;
    opacity: 1;
}

/* Panel open state */
.admin-panel.open {
    right: 0 !important;
}

/* Ensure admin status is hidden by default */
.admin-status {
    position: fixed;
    top: var(--spacing-5);
    left: var(--spacing-5);
    background: var(--success-color);
    color: var(--text-white);
    padding: var(--spacing-2) var(--spacing-4);
    border-radius: var(--radius-3xl);
    font-size: var(--text-xs);
    font-weight: var(--font-medium);
    z-index: var(--z-50);
    display: none; /* Hidden by default */
    box-shadow: var(--shadow-lg);
    align-items: center;
    gap: var(--spacing-2);
    backdrop-filter: blur(8px);
    
    /* Prevent flash */
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease;
}

/* Show admin status when logged in */
.admin-status.logged-in {
    display: flex !important;
    opacity: 1 !important;
    visibility: visible !important;
}

/* Tab admin panel button - hidden by default */
.admin-panel-trigger {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-hover)) !important;
    color: var(--text-white) !important;
    border-radius: var(--radius-lg) !important;
    margin-left: var(--spacing-4) !important;
    position: relative;
    display: none !important; /* Hidden by default */
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease;
}

/* Show admin panel button when logged in */
body.admin-logged-in .admin-panel-trigger {
    display: flex !important;
    opacity: 1 !important;
    visibility: visible !important;
}

/* Enhanced body class-based login status control */
body.admin-logged-out .admin-status {
    display: none !important;
    opacity: 0 !important;
    visibility: hidden !important;
}

body.admin-logged-out .admin-panel-trigger {
    display: none !important;
    opacity: 0 !important;
    visibility: hidden !important;
}

body.admin-logged-in .admin-status {
    display: flex !important;
    opacity: 1 !important;
    visibility: visible !important;
}

body.admin-logged-in .admin-panel-trigger {
    display: flex !important;
    opacity: 1 !important;
    visibility: visible !important;
}

/* Hidden state during page load */
body:not(.page-loaded) .admin-panel {
    right: -400px !important;
    opacity: 0 !important;
    visibility: hidden !important;
}

/* Hero Section */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    overflow: hidden;
    margin-top: 64px;
}

.hero-bg {
    position: absolute;
    inset: 0;
    background: var(--gradient-hero);
    z-index: -3;
}

/* 2. 替换原有的 .hero-pattern 样式 */
.hero-pattern {
    position: absolute;
    inset: 0;
    background-image:
    /* 碳纳米管结构 - 增大周期 */
    repeating-linear-gradient( 0deg, transparent, transparent 6px, rgba(255, 215, 0, 0.15) 6px, rgba(255, 215, 0, 0.15) 10px ), repeating-linear-gradient( 60deg, transparent, transparent 6px, rgba(255, 255, 255, 0.15) 6px, rgba(255, 255, 255, 0.15) 10px ), repeating-linear-gradient( 120deg, transparent, transparent 6px, rgba(255, 255, 255, 0.15) 6px, rgba(255, 255, 255, 0.15) 10px ),
    /* 量子点效果 - 增大尺寸 */
    radial-gradient(circle at 20% 20%, rgba(255, 215, 0, 0.2) 3px, transparent 3px), radial-gradient(circle at 80% 80%, rgba(255, 255, 255, 0.2) 3px, transparent 3px);
    background-size: 80px 80px, 80px 80px, 80px 80px, 200px 200px, 240px 240px;
    animation: hexagonalFloat 25s ease-in-out infinite;
    z-index: -2;
}
.hero-glow {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(255, 215, 0, 0.2) 0%, transparent 70%);
    border-radius: var(--radius-full);
    animation: glow 8s ease-in-out infinite alternate;
    z-index: -1;
}

.hero-content {
    max-width: 900px;
    padding: var(--spacing-8);
    position: relative;
    z-index: var(--z-10);
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-2);
    background: rgba(255, 255, 255, 0.2);
    color: var(--text-white);
    padding: var(--spacing-2) var(--spacing-5);
    border-radius: var(--radius-3xl);
    font-size: var(--text-sm);
    font-weight: var(--font-medium);
    margin-bottom: var(--spacing-8);
    backdrop-filter: blur(8px);
    border: 1px solid rgba(255, 255, 255, 0.3);
}

.badge-icon {
    font-size: var(--text-base);
}

.hero-title {
    margin-bottom: var(--spacing-8);
}

.title-main {
    display: block;
    font-size: clamp(var(--text-3xl), 6vw, var(--text-6xl));
    font-weight: var(--font-bold);
    color: var(--text-white);
    line-height: var(--leading-tight);
    margin-bottom: var(--spacing-4);
    text-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

.title-sub {
    display: block;
    font-size: clamp(var(--text-lg), 3vw, var(--text-2xl));
    font-weight: var(--font-light);
    color: rgba(255, 255, 255, 0.9);
    line-height: var(--leading-relaxed);
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
}

.hero-description {
    margin-bottom: var(--spacing-12);
}

.hero-description p {
    font-size: var(--text-lg);
    color: rgba(255, 255, 255, 0.95);
    line-height: var(--leading-relaxed);
    margin-bottom: var(--spacing-3);
    text-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
}

.hero-stats {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--spacing-8);
    flex-wrap: wrap;
}

.stat-item {
    text-align: center;
}

.stat-number {
    font-size: var(--text-3xl);
    font-weight: var(--font-bold);
    color: var(--text-white);
    margin-bottom: var(--spacing-1);
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
}

.stat-label {
    font-size: var(--text-sm);
    color: rgba(255, 255, 255, 0.8);
    font-weight: var(--font-medium);
}

.stat-divider {
    width: 1px;
    height: 40px;
    background: rgba(255, 255, 255, 0.3);
}

/* Admin Panel Header and Content */
.admin-header {
    background: var(--gradient-primary);
    color: var(--text-white);
    padding: var(--spacing-6);
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: var(--z-10);
}

.admin-header h3 {
    font-size: var(--text-lg);
    font-weight: var(--font-semibold);
}

.admin-content {
    padding: var(--spacing-8);
}

.admin-section {
    margin-bottom: var(--spacing-8);
    border-bottom: 1px solid var(--border-light);
    padding-bottom: var(--spacing-8);
}

.admin-section:last-child {
    border-bottom: none;
    margin-bottom: 0;
}

.admin-section h3 {
    color: var(--text-primary);
    margin-bottom: var(--spacing-4);
    font-size: var(--text-lg);
    font-weight: var(--font-semibold);
}

/* Modal Styles */
.login-modal,
.edit-modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--bg-overlay);
    z-index: var(--z-modal);
    padding: var(--spacing-8);
    backdrop-filter: blur(8px);
}

.login-container,
.edit-container {
    background: var(--bg-primary);
    border-radius: var(--radius-3xl);
    max-width: 28rem;
    margin: 10% auto;
    padding: var(--spacing-12);
    position: relative;
    box-shadow: var(--shadow-2xl);
    border: 1px solid var(--border-light);
}

.edit-container {
    max-width: 40rem;
    max-height: 80vh;
    overflow-y: auto;
    margin: 5% auto;
}

.login-header {
    text-align: center;
    margin-bottom: var(--spacing-8);
}

.pku-logo-small {
    font-size: var(--text-4xl);
    margin-bottom: var(--spacing-4);
    color: var(--primary-color);
}

.login-header h2 {
    color: var(--primary-color);
    margin-bottom: var(--spacing-2);
    font-size: var(--text-2xl);
    font-weight: var(--font-semibold);
}

.login-header p {
    color: var(--text-muted);
    font-size: var(--text-sm);
}

.login-form,
.edit-form {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-6);
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-2);
}

.form-group label {
    color: var(--text-secondary);
    font-weight: var(--font-medium);
    font-size: var(--text-sm);
}

.form-group input,
.edit-form input,
.edit-form textarea,
.edit-form select {
    padding: var(--spacing-3);
    border: 2px solid var(--border-light);
    border-radius: var(--radius-lg);
    font-size: var(--text-base);
    font-family: inherit;
    transition: var(--transition-fast);
    background: var(--bg-primary);
    color: var(--text-primary);
}

.form-group input:focus,
.edit-form input:focus,
.edit-form textarea:focus,
.edit-form select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(196, 30, 58, 0.1);
}

.edit-form textarea {
    min-height: 100px;
    resize: vertical;
    font-family: inherit;
    line-height: var(--leading-relaxed);
}

.login-btn,
.admin-btn {
    background: var(--gradient-primary);
    color: var(--text-white);
    border: none;
    padding: var(--spacing-4) var(--spacing-6);
    border-radius: var(--radius-lg);
    font-size: var(--text-base);
    font-weight: var(--font-semibold);
    cursor: pointer;
    transition: var(--transition-fast);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-2);
    font-family: inherit;
}

.admin-btn {
    padding: var(--spacing-2) var(--spacing-5);
    font-size: var(--text-sm);
    margin: var(--spacing-1);
    background: var(--primary-color);
}

.login-btn:hover,
.admin-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.admin-btn.danger {
    background: var(--danger-color);
}

.admin-btn.danger:hover {
    background: #dc2626;
}

.close-login {
    position: absolute;
    top: var(--spacing-4);
    right: var(--spacing-5);
    background: none;
    border: none;
    font-size: var(--text-2xl);
    color: var(--text-muted);
    cursor: pointer;
    padding: var(--spacing-2);
    border-radius: var(--radius-full);
    transition: var(--transition-fast);
}

.close-login:hover {
    color: var(--text-secondary);
    background: var(--bg-tertiary);
}

.error-message {
    color: var(--danger-color);
    font-size: var(--text-sm);
    margin-top: var(--spacing-2);
    display: none;
    padding: var(--spacing-2);
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid rgba(239, 68, 68, 0.2);
    border-radius: var(--radius-md);
}

/* Tab Navigation */
.tab-container {
    background: var(--bg-glass);
    backdrop-filter: blur(12px);
    box-shadow: var(--shadow-lg);
    border-bottom: 1px solid var(--border-light);
    position: sticky;
    top: 64px;
    z-index: var(--z-40);
}

.tab-nav {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    padding: 0 var(--spacing-8);
    gap: var(--spacing-1);
}

.tab-button {
    background: none;
    border: none;
    color: var(--text-muted);
    padding: var(--spacing-5) var(--spacing-6);
    cursor: pointer;
    transition: var(--transition-fast);
    position: relative;
    font-size: var(--text-base);
    font-family: inherit;
    font-weight: var(--font-medium);
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
    white-space: nowrap;
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
}

.tab-button:hover {
    color: var(--primary-color);
    background: rgba(196, 30, 58, 0.05);
}

.tab-button.active {
    color: var(--primary-color);
    background: var(--bg-primary);
    font-weight: var(--font-semibold);
}

.tab-button.active::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--gradient-primary);
    border-radius: var(--radius-sm) var(--radius-sm) 0 0;
}

.tab-icon {
    font-size: var(--text-lg);
}

.tab-text {
    font-size: var(--text-sm);
}

/* Tab Content */
.tab-content {
    display: none;
    min-height: calc(100vh - 200px);
    padding: var(--spacing-16) var(--spacing-8);
    max-width: 1200px;
    margin: 0 auto;
}

.tab-content.active {
    display: block;
    animation: fadeIn 0.4s ease;
}

.content-card {
    background: var(--bg-primary);
    border-radius: var(--radius-3xl);
    padding: var(--spacing-16);
    box-shadow: var(--shadow-xl);
    border: 1px solid var(--border-light);
    position: relative;
    margin-bottom: var(--spacing-8);
}

.card-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-4);
    margin-bottom: var(--spacing-12);
}

.card-icon {
    font-size: var(--text-4xl);
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.content-card h2 {
    font-size: clamp(var(--text-2xl), 4vw, var(--text-4xl));
    color: var(--text-primary);
    position: relative;
    font-weight: var(--font-bold);
    line-height: var(--leading-tight);
}

/* Home Page Styles */
.intro-card {
    background: linear-gradient(135deg, var(--bg-primary) 0%, #f8fafc 100%);
    margin-bottom: var(--spacing-8);
}

.intro-content {
    margin-top: var(--spacing-8);
}

.intro-text {
    font-size: var(--text-lg);
    line-height: var(--leading-relaxed);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-8);
}

.highlight {
    background: linear-gradient(120deg, rgba(196, 30, 58, 0.1), rgba(196, 30, 58, 0.2));
    padding: var(--spacing-1) var(--spacing-3);
    border-radius: var(--radius-lg);
    font-weight: var(--font-semibold);
    color: var(--primary-color);
    border: 1px solid rgba(196, 30, 58, 0.2);
    display: inline-block;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-6);
    margin-top: var(--spacing-12);
}

.feature-item {
    text-align: center;
    padding: var(--spacing-6);
    background: var(--bg-glass);
    border-radius: var(--radius-2xl);
    border: 1px solid var(--border-light);
    backdrop-filter: blur(8px);
    transition: var(--transition-normal);
}

.feature-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.feature-icon {
    font-size: var(--text-3xl);
    margin-bottom: var(--spacing-3);
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.feature-title {
    font-size: var(--text-lg);
    font-weight: var(--font-semibold);
    color: var(--text-primary);
    margin-bottom: var(--spacing-2);
}

.feature-desc {
    font-size: var(--text-sm);
    color: var(--text-muted);
}

/* Research Areas Styles - Enhanced with Image Support */
.research-card {
    background: linear-gradient(135deg, #fafbfc 0%, var(--bg-primary) 100%);
}

.research-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: var(--spacing-8);
    margin-top: var(--spacing-8);
}

.research-item {
    background: var(--bg-glass);
    padding: var(--spacing-10);
    border-radius: var(--radius-3xl);
    border: 1px solid var(--border-light);
    position: relative;
    box-shadow: var(--shadow-lg);
    overflow: hidden;
    backdrop-filter: blur(8px);
    transition: var(--transition-normal);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-6);
}

.research-item:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-2xl);
}

/* Research Image Container - New Addition */
.research-image-container {
    width: 100%;
    height: 200px;
    border-radius: var(--radius-2xl);
    overflow: hidden;
    position: relative;
    background: var(--bg-tertiary);
    margin-bottom: var(--spacing-4);
    box-shadow: var(--shadow-md);
    order: -1; /* Ensure image appears first */
}

.research-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition-normal);
}

.research-item:hover .research-image {
    transform: scale(1.05);
}

/* Research Image Placeholder */
.research-image-placeholder {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--bg-tertiary) 0%, var(--bg-muted) 100%);
    color: var(--text-muted);
    font-size: var(--text-lg);
    font-weight: var(--font-medium);
}

/* Research Content Section */
.research-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-3);
}

.research-number {
    position: absolute;
    top: var(--spacing-4);
    right: var(--spacing-4);
    font-size: var(--text-xl);
    font-weight: var(--font-bold);
    color: rgba(196, 30, 58, 0.15);
    z-index: 2;
    background: rgba(255, 255, 255, 0.8);
    width: 40px;
    height: 40px;
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    backdrop-filter: blur(4px);
}

.research-icon {
    font-size: var(--text-2xl);
    margin-bottom: var(--spacing-2);
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    position: relative;
    z-index: 2;
    align-self: flex-start;
}

.research-item h4 {
    font-size: var(--text-xl);
    margin-bottom: var(--spacing-3);
    color: var(--text-primary);
    font-weight: var(--font-semibold);
    line-height: var(--leading-tight);
    position: relative;
    z-index: 2;
}

.research-item p {
    color: var(--text-secondary);
    line-height: var(--leading-relaxed);
    margin-bottom: var(--spacing-4);
    position: relative;
    z-index: 2;
    flex: 1;
}

.research-tags {
    display: flex;
    gap: var(--spacing-2);
    flex-wrap: wrap;
    position: relative;
    z-index: 2;
    margin-top: auto;
}

.tag {
    background: rgba(196, 30, 58, 0.1);
    color: var(--primary-color);
    padding: var(--spacing-1) var(--spacing-3);
    border-radius: var(--radius-3xl);
    font-size: var(--text-xs);
    font-weight: var(--font-medium);
    border: 1px solid rgba(196, 30, 58, 0.2);
}

/* Admin Edit Section for Research Items */
.research-item .admin-edit-section {
    margin-top: var(--spacing-4);
    padding-top: var(--spacing-3);
    border-top: 1px solid var(--border-light);
    position: relative;
    z-index: 2;
}

/* Team Members Styles - Optimized English Version */
.pi-section {
    margin-bottom: var(--spacing-16);
}

.pi-card {
    background: linear-gradient(135deg, #f8fafc 0%, #ffffff 100%);
    border-radius: var(--radius-2xl);
    padding: var(--spacing-12);
    border: 1px solid var(--border-light);
    box-shadow: var(--shadow-md);
    position: relative;
}

.pi-header {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-8);
    margin-bottom: var(--spacing-8);
}

.pi-avatar {
    width: 250px;
    height: 300px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-xl);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
    font-size: var(--text-sm);
    text-align: center;
    border: 2px solid var(--border-medium);
    flex-shrink: 0;
    overflow: hidden;
    background-size: cover;
    background-position: center;
}

.pi-avatar.has-photo {
    border-color: var(--primary-color);
}

.pi-info {
    flex: 1;
}

.pi-info h3 {
    font-size: var(--text-3xl);
    color: var(--text-primary);
    margin-bottom: var(--spacing-2);
    font-weight: var(--font-bold);
}

.pi-title {
    font-size: var(--text-lg);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-4);
    font-weight: var(--font-medium);
}

.pi-bio {
    font-size: var(--text-base);
    line-height: var(--leading-relaxed);
    color: var(--text-secondary);
    margin-top: var(--spacing-6);
}

.contact-quick {
    display: flex;
    gap: var(--spacing-3);
    margin-top: var(--spacing-4);
    flex-wrap: wrap;
}

.contact-badge {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    padding: var(--spacing-2) var(--spacing-4);
    border-radius: var(--radius-lg);
    font-size: var(--text-sm);
    border: 1px solid var(--border-light);
    font-weight: var(--font-medium);
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
}

/* Team Sections */
.team-sections {
    margin-top: var(--spacing-12);
}

.team-section {
    margin-bottom: var(--spacing-12);
    background: var(--bg-primary);
    border-radius: var(--radius-xl);
    padding: var(--spacing-8);
    border: 1px solid var(--border-light);
    box-shadow: var(--shadow-sm);
}

.section-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-3);
    margin-bottom: var(--spacing-6);
    padding-bottom: var(--spacing-3);
    border-bottom: 2px solid var(--border-light);
}

.section-icon {
    font-size: var(--text-xl);
    color: var(--primary-color);
}

.section-header h3 {
    font-size: var(--text-xl);
    color: var(--text-primary);
    font-weight: var(--font-semibold);
    flex: 1;
}

.section-badge {
    background: var(--primary-color);
    color: var(--text-white);
    padding: var(--spacing-1) var(--spacing-3);
    border-radius: var(--radius-lg);
    font-size: var(--text-xs);
    font-weight: var(--font-semibold);
}

/* Unified member list styles - one member per row */
.postdoc-list,
.team-grid,
.members-grid,
.assistants-grid {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-4);
}

/* Unified member card styles */
.member-card {
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    padding: var(--spacing-6);
    border: 1px solid var(--border-light);
    display: flex;
    align-items: center;
    gap: var(--spacing-6);
    /* Remove all hover effects */
    transition: none;
    transform: none;
    box-shadow: none;
}

/* Remove hover effects */
.member-card:hover {
    transform: none;
    box-shadow: none;
    border-color: var(--border-light);
}

/* Member avatar unified styles */
.member-avatar {
    width: 250px;
    height: 300px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--text-sm);
    border: 2px solid var(--border-light);
    background-size: cover;
    background-position: center;
    overflow: hidden;
    font-weight: var(--font-medium);
    color: var(--text-muted);
    flex-shrink: 0;
}

/* Member information area */
.member-info {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-2);
}

.member-info h4 {
    font-size: var(--text-lg);
    font-weight: var(--font-semibold);
    color: var(--text-primary);
    margin: 0;
}

.member-year,
.member-position,
.member-research {
    color: var(--primary-color);
    font-weight: var(--font-medium);
    font-size: var(--text-sm);
    margin: 0;
}

.member-bio {
    color: var(--text-secondary);
    line-height: var(--leading-normal);
    font-size: var(--text-sm);
    margin: var(--spacing-2) 0;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.member-contacts {
    display: flex;
    gap: var(--spacing-2);
    flex-wrap: wrap;
    margin-top: var(--spacing-2);
}

.contact-tag {
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    padding: var(--spacing-1) var(--spacing-3);
    border-radius: var(--radius-md);
    font-size: var(--text-xs);
    border: 1px solid var(--border-light);
    font-weight: var(--font-medium);
}

/* Postdoc special styles */
.postdoc-card {
    background: #f8fafc;
    border-left: 4px solid var(--primary-color);
}

/* PhD student styles */
.student-card {
    background: #fafbfc;
    border-left: 4px solid var(--secondary-color);
}

/* Research assistant styles */
.assistant-card {
    background: #f9fafb;
    border-left: 4px solid var(--success-color);
}

/* Recruitment/Internship opportunity cards */
.recruitment-card {
    background: linear-gradient(135deg, #fef3c7 0%, #fde68a 100%);
    border: 2px dashed var(--warning-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-8);
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 120px;
    margin: var(--spacing-4) 0;
    /* Remove hover effects */
    transition: none;
    transform: none;
}

.recruitment-card:hover {
    transform: none;
    box-shadow: none;
}

.recruitment-icon {
    font-size: var(--text-3xl);
    margin-bottom: var(--spacing-3);
    color: var(--warning-color);
}

.recruitment-text h4 {
    color: #d97706;
    margin-bottom: var(--spacing-2);
    font-size: var(--text-lg);
    font-weight: var(--font-semibold);
}

.recruitment-text p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-3);
    font-size: var(--text-sm);
}

.recruitment-tags {
    display: flex;
    gap: var(--spacing-2);
    flex-wrap: wrap;
    justify-content: center;
}

.recruitment-tags .tag {
    background: rgba(217, 119, 6, 0.1);
    color: #d97706;
    padding: var(--spacing-1) var(--spacing-2);
    border-radius: var(--radius-md);
    font-size: var(--text-xs);
    font-weight: var(--font-medium);
    border: 1px solid rgba(217, 119, 6, 0.2);
}

/* Admin add member button */
.add-member-card {
    background: var(--bg-tertiary);
    border: 2px dashed var(--border-medium);
    border-radius: var(--radius-lg);
    padding: var(--spacing-6);
    text-align: center;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100px;
    cursor: pointer;
    /* Remove hover effects */
    transition: none;
    transform: none;
}

.add-member-card:hover {
    background: var(--bg-muted);
    border-color: var(--primary-color);
    transform: none;
}

.add-member-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-2);
}

.add-icon {
    font-size: var(--text-2xl);
    color: var(--primary-color);
}

.add-text {
    color: var(--text-primary);
    font-weight: var(--font-medium);
    font-size: var(--text-sm);
}

/* Admin edit section */
.admin-edit-section {
    margin-top: var(--spacing-4);
    padding-top: var(--spacing-4);
    border-top: 1px solid var(--border-light);
    display: flex;
    gap: var(--spacing-2);
    flex-wrap: wrap;
}

/* Join us section optimized */
.join-section {
    margin-top: var(--spacing-16);
}

.join-card {
    background: linear-gradient(135deg, #fef3c7 0%, #fde68a 100%);
    border: 2px solid var(--warning-color);
    border-radius: var(--radius-2xl);
    padding: var(--spacing-10);
    text-align: center;
    box-shadow: var(--shadow-md);
    /* Remove hover effects */
    transition: none;
    transform: none;
}

.join-card:hover {
    transform: none;
    box-shadow: var(--shadow-md);
}

.join-icon {
    font-size: var(--text-4xl);
    margin-bottom: var(--spacing-4);
    color: var(--warning-color);
}

.join-card h3 {
    color: #d97706;
    margin-bottom: var(--spacing-4);
    font-size: var(--text-xl);
    font-weight: var(--font-bold);
}

.join-card p {
    color: var(--text-secondary);
    line-height: var(--leading-relaxed);
    margin-bottom: var(--spacing-4);
    font-size: var(--text-base);
}

.join-contact {
    color: var(--text-primary);
    font-size: var(--text-lg);
    font-weight: var(--font-semibold);
}

/* Publications List Styles */
.publications-list {
    margin-top: var(--spacing-8);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-8);
}

.publication-item {
    background: var(--bg-glass);
    border-radius: var(--radius-3xl);
    padding: var(--spacing-10);
    border: 1px solid var(--border-light);
    position: relative;
    box-shadow: var(--shadow-lg);
    cursor: pointer;
    transition: var(--transition-normal);
    display: grid;
    grid-template-columns: 60px 1fr;
    gap: var(--spacing-6);
    align-items: start;
    backdrop-filter: blur(8px);
}

.publication-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
}

.publication-number {
    background: var(--gradient-primary);
    color: var(--text-white);
    width: 50px;
    height: 50px;
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: var(--font-bold);
    font-size: var(--text-lg);
    box-shadow: var(--shadow-md);
    position: sticky;
    top: var(--spacing-4);
}

.publication-content {
    flex: 1;
}

.publication-title {
    font-weight: var(--font-semibold);
    color: var(--text-primary);
    margin-bottom: var(--spacing-4);
    font-size: var(--text-lg);
    line-height: var(--leading-normal);
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: var(--spacing-4);
    transition: var(--transition-fast);
}

.publication-title:hover {
    color: var(--primary-color);
}

.expand-icon {
    font-size: var(--text-xl);
    transition: transform 0.3s ease;
    color: var(--text-muted);
    flex-shrink: 0;
    margin-top: var(--spacing-1);
}

.expand-icon.expanded {
    transform: rotate(180deg);
}

.publication-authors {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-3);
    line-height: var(--leading-relaxed);
    font-size: var(--text-sm);
}

.publication-authors strong {
    color: var(--primary-color);
    font-weight: var(--font-semibold);
}

.publication-journal {
    display: flex;
    align-items: center;
    gap: var(--spacing-3);
    margin-bottom: var(--spacing-4);
}

.journal-name {
    color: var(--primary-color);
    font-weight: var(--font-bold);
    font-size: var(--text-base);
}

.journal-details {
    color: var(--text-muted);
    font-size: var(--text-sm);
}

.publication-details {
    display: none;
    margin-top: var(--spacing-6);
    padding: var(--spacing-8);
    background: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 100%);
    border-radius: var(--radius-xl);
    border: 1px solid rgba(59, 130, 246, 0.2);
}

.publication-details.show {
    display: block;
    animation: slideDown 0.3s ease;
}

.publication-abstract {
    margin-bottom: var(--spacing-6);
    line-height: var(--leading-relaxed);
    color: var(--text-secondary);
    font-size: var(--text-base);
}

.publication-links {
    display: flex;
    gap: var(--spacing-3);
    flex-wrap: wrap;
}

.publication-link {
    background: var(--primary-color);
    color: var(--text-white);
    text-decoration: none;
    padding: var(--spacing-3) var(--spacing-5);
    border-radius: var(--radius-lg);
    font-weight: var(--font-medium);
    transition: var(--transition-fast);
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-2);
    font-size: var(--text-sm);
}

.publication-link:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.publication-link.secondary {
    background: var(--secondary-color);
}

.publication-link.tertiary {
    background: var(--info-color);
}

/* Research Tools Styles */
.programs-intro {
    color: var(--text-muted);
    margin-bottom: var(--spacing-8);
    font-size: var(--text-lg);
    text-align: center;
}

.programs-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--spacing-8);
    margin-top: var(--spacing-8);
}

.program-card {
    background: var(--bg-glass);
    border-radius: var(--radius-3xl);
    padding: var(--spacing-12);
    border: 1px solid var(--border-light);
    cursor: pointer;
    transition: var(--transition-normal);
    text-align: center;
    position: relative;
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    backdrop-filter: blur(8px);
}

.program-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-2xl);
    border-color: var(--primary-color);
}

.program-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--gradient-primary);
    transform: scaleX(0);
    transition: transform 0.3s ease;
}

.program-card:hover::before {
    transform: scaleX(1);
}

.program-icon {
    font-size: var(--text-5xl);
    margin-bottom: var(--spacing-6);
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    position: relative;
    z-index: var(--z-10);
}

.program-title {
    font-size: var(--text-xl);
    font-weight: var(--font-semibold);
    color: var(--text-primary);
    margin-bottom: var(--spacing-4);
    position: relative;
    z-index: var(--z-10);
}

.program-description {
    color: var(--text-secondary);
    line-height: var(--leading-relaxed);
    font-size: var(--text-base);
    margin-bottom: var(--spacing-6);
    position: relative;
    z-index: var(--z-10);
}

.program-tags {
    display: flex;
    gap: var(--spacing-2);
    justify-content: center;
    flex-wrap: wrap;
}

/* News Section Styles */
.news-list {
    margin-top: var(--spacing-8);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-6);
}

.news-item {
    background: var(--bg-glass);
    border-radius: var(--radius-2xl);
    padding: var(--spacing-8);
    border: 1px solid var(--border-light);
    box-shadow: var(--shadow-md);
    display: flex;
    gap: var(--spacing-6);
    transition: var(--transition-normal);
}

.news-item:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.news-date {
    background: var(--primary-color);
    color: var(--text-white);
    padding: var(--spacing-2) var(--spacing-4);
    border-radius: var(--radius-lg);
    font-size: var(--text-sm);
    font-weight: var(--font-semibold);
    white-space: nowrap;
    height: fit-content;
}

.news-content {
    flex: 1;
}

.news-content h3 {
    color: var(--text-primary);
    margin-bottom: var(--spacing-3);
    font-size: var(--text-lg);
    font-weight: var(--font-semibold);
}

.news-summary {
    color: var(--text-secondary);
    line-height: var(--leading-relaxed);
    margin-bottom: var(--spacing-4);
}

.news-tags {
    display: flex;
    gap: var(--spacing-2);
    flex-wrap: wrap;
}

/* Contact Us Page */
.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--spacing-8);
    margin-top: var(--spacing-8);
}

.contact-item {
    background: var(--bg-glass);
    padding: var(--spacing-10);
    border-radius: var(--radius-3xl);
    border: 1px solid var(--border-light);
    box-shadow: var(--shadow-lg);
    backdrop-filter: blur(8px);
    transition: var(--transition-normal);
}

.contact-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
}

.contact-icon {
    font-size: var(--text-4xl);
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--spacing-4);
}

.contact-item h4 {
    color: var(--text-primary);
    margin-bottom: var(--spacing-6);
    font-size: var(--text-xl);
    font-weight: var(--font-semibold);
}

.contact-details {
    line-height: var(--leading-relaxed);
    color: var(--text-secondary);
}

.contact-row {
    margin-bottom: var(--spacing-3);
    font-size: var(--text-base);
}

.address-tag {
    background: rgba(59, 130, 246, 0.1);
    color: var(--secondary-color);
    padding: var(--spacing-1) var(--spacing-3);
    border-radius: var(--radius-lg);
    font-size: var(--text-sm);
    font-weight: var(--font-medium);
    display: inline-block;
    margin-top: var(--spacing-3);
    border: 1px solid rgba(59, 130, 246, 0.2);
}

.recruitment-directions {
    margin-top: var(--spacing-4);
}

.direction-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
    margin-bottom: var(--spacing-2);
    font-size: var(--text-base);
}

.direction-icon {
    color: var(--primary-color);
    font-weight: var(--font-bold);
}

/* Empty State Styles */
.empty-state {
    text-align: center;
    padding: var(--spacing-20) var(--spacing-8);
    color: var(--text-muted);
}

.empty-state h3 {
    margin-bottom: var(--spacing-4);
    color: var(--text-primary);
    font-weight: var(--font-semibold);
    font-size: var(--text-xl);
}

.empty-icon {
    font-size: var(--text-6xl);
    margin-bottom: var(--spacing-6);
    opacity: 0.4;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Admin Edit Features Styles */
.admin-edit-section {
    margin-top: var(--spacing-4);
    padding-top: var(--spacing-4);
    border-top: 1px solid var(--border-light);
    display: flex;
    gap: var(--spacing-2);
    flex-wrap: wrap;
}

.add-member-card,
.add-research-card,
.add-publication-item {
    background: linear-gradient(135deg, var(--bg-secondary), var(--bg-tertiary));
    border: 2px dashed var(--primary-color);
    border-radius: var(--radius-2xl);
    padding: var(--spacing-8);
    text-align: center;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 200px;
    transition: var(--transition-normal);
}

.add-member-card:hover,
.add-research-card:hover,
.add-publication-item:hover {
    background: linear-gradient(135deg, var(--bg-tertiary), var(--bg-muted));
    transform: translateY(-2px);
}

/* Notification Styles */
.notification {
    position: fixed;
    top: 80px;
    right: 20px;
    padding: var(--spacing-4) var(--spacing-6);
    border-radius: var(--radius-lg);
    color: var(--text-white);
    font-weight: var(--font-medium);
    z-index: 10000;
    max-width: 350px;
    word-wrap: break-word;
    box-shadow: var(--shadow-xl);
    transform: translateX(100%);
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
    backdrop-filter: blur(8px);
}

.notification.show {
    transform: translateX(0);
}

.notification-success {
    background: linear-gradient(135deg, var(--success-color), #059669);
}

.notification-error {
    background: linear-gradient(135deg, var(--danger-color), #dc2626);
}

.notification-warning {
    background: linear-gradient(135deg, var(--warning-color), #d97706);
}

.notification-info {
    background: linear-gradient(135deg, var(--info-color), #0891b2);
}

/* Animation Definitions */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideInLeft {
    from {
        opacity: 0;
        transform: translateX(-20px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes pulse {
    0%, 100% { 
        opacity: 1; 
        transform: scale(1);
    }
    50% { 
        opacity: 0.7; 
        transform: scale(1.05);
    }
}

@keyframes float {
    0%, 100% {
        transform: translateY(0px);
    }
    50% {
        transform: translateY(-10px);
    }
}

@keyframes glow {
    0% {
        transform: translate(-50%, -50%) scale(1);
        opacity: 0.2;
    }
    100% {
        transform: translate(-50%, -50%) scale(1.1);
        opacity: 0.3;
    }
}

/* Responsive Design */
@media (max-width: 1024px) {
    .hero-stats {
        gap: var(--spacing-6);
    }
    
    .stat-divider {
        display: none;
    }
    
    .pi-header {
        flex-direction: column;
        text-align: center;
        gap: var(--spacing-6);
    }
    
    .research-grid {
        grid-template-columns: 1fr;
    }
    
    .programs-grid {
        grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    }
    
    .members-grid {
        grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    }
    
    .features-grid {
        grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    }
    
    .research-image-container {
        height: 150px;
    }
}

@media (max-width: 768px) {
    .hero {
        margin-top: 64px;
        min-height: 80vh;
    }
    
    .hero-content {
        padding: var(--spacing-6);
    }
    
    .hero-stats {
        flex-direction: column;
        gap: var(--spacing-4);
    }
    
    .tab-content {
        padding: var(--spacing-12) var(--spacing-4);
    }
    
    .content-card {
        padding: var(--spacing-12);
    }
    
    .admin-panel {
        width: 100%;
        right: -100%;
    }
    
    .admin-panel.open {
        right: 0 !important;
    }
    
    .nav-container {
        padding: 0 var(--spacing-4);
    }
    
    .login-container,
    .edit-container {
        margin: 5% auto;
        padding: var(--spacing-8);
        max-width: calc(100vw - var(--spacing-8));
    }
    
    .tab-nav {
        padding: 0 var(--spacing-4);
        gap: 0;
        overflow-x: auto;
    }
    
    .tab-button {
        padding: var(--spacing-4) var(--spacing-5);
        font-size: var(--text-sm);
        flex-shrink: 0;
    }
    
    .research-grid,
    .programs-grid,
    .members-grid,
    .contact-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-6);
    }
    
    .publication-item {
        grid-template-columns: 1fr;
        gap: var(--spacing-4);
        text-align: center;
    }
    
    .publication-number {
        position: relative;
        margin: 0 auto var(--spacing-4);
        top: 0;
    }
    
    .publication-title {
        flex-direction: column;
        align-items: center;
        gap: var(--spacing-2);
        text-align: center;
    }
    
    .publication-links {
        flex-direction: column;
        gap: var(--spacing-3);
    }
    
    .publication-link {
        text-align: center;
        justify-content: center;
    }
    
    .contact-quick {
        flex-direction: column;
        gap: var(--spacing-3);
    }
    
    .member-contacts {
        flex-direction: column;
        gap: var(--spacing-2);
    }
    
    .member-card {
        flex-direction: column;
        text-align: center;
        gap: var(--spacing-4);
    }
    
    .member-avatar {
        width: 100px;
        height: 100px;
    }
    
    .member-info {
        align-items: center;
    }
    
    .member-contacts {
        justify-content: center;
    }
    
    .news-item {
        flex-direction: column;
        gap: var(--spacing-4);
    }
    
    .news-date {
        align-self: flex-start;
    }
    
    .research-image-container {
        height: 120px;
    }
    
    .research-item {
        padding: var(--spacing-6);
        gap: var(--spacing-4);
    }
}

@media (max-width: 480px) {
    .content-card {
        padding: var(--spacing-8);
    }
    
    .card-header {
        flex-direction: column;
        text-align: center;
        gap: var(--spacing-3);
    }
    
    .pi-card {
        padding: var(--spacing-10);
    }
    
    .member-card {
        padding: var(--spacing-6);
    }
    
    .research-item {
        padding: var(--spacing-8);
    }
    
    .program-card {
        padding: var(--spacing-8);
    }
    
    .publication-item {
        padding: var(--spacing-8);
    }
    
    .contact-item {
        padding: var(--spacing-8);
    }
    
    .nav-school {
        display: none;
    }
    
    .nav-separator {
        display: none;
    }
    
    .admin-status {
        bottom: var(--spacing-2);
        left: var(--spacing-2);
        padding: var(--spacing-1) var(--spacing-3);
        font-size: 10px;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .research-tags,
    .program-tags,
    .recruitment-tags {
        justify-content: center;
    }
    
    .admin-hidden-trigger {
        width: 16px;
        height: 16px;
    }
    
    .hidden-dot {
        width: 6px;
        height: 6px;
    }
    
    .team-section {
        padding: var(--spacing-6);
    }
    
    .member-card {
        padding: var(--spacing-4);
    }
    
    .pi-info h3 {
        font-size: var(--text-2xl);
    }
    
    .contact-quick {
        flex-direction: column;
        align-items: center;
    }
    
    .member-contacts {
        flex-direction: column;
        align-items: center;
    }
    
    .research-image-container {
        height: 100px;
        border-radius: var(--radius-lg);
    }
    
    .research-number {
        width: 30px;
        height: 30px;
        font-size: var(--text-base);
        top: var(--spacing-2);
        right: var(--spacing-2);
    }
}

/* Print Styles */
@media print {
    .top-nav,
    .admin-status,
    .admin-login-btn,
    .admin-panel,
    .tab-nav,
    .notification {
        display: none !important;
    }
    
    .hero {
        margin-top: 0;
        min-height: auto;
        padding: var(--spacing-8);
    }
    
    .tab-content {
        display: block !important;
        padding: var(--spacing-4);
    }
    
    .content-card {
        box-shadow: none;
        border: 1px solid var(--border-medium);
        margin-bottom: var(--spacing-6);
    }
}