/* ==========================================================================
   ACADEMIC DESIGN SYSTEM & VARIABLES (KIST Lab Theme)
   ========================================================================== */
:root {
    /* Fonts */
    --font-primary: 'Outfit', 'Noto Sans KR', sans-serif;
    
    /* Common Light Colors */
    --light-bg-primary: #f8fafc;
    --light-bg-secondary: #ffffff;
    --light-bg-tertiary: #f1f5f9;
    --light-text-primary: #0f172a;
    --light-text-secondary: #475569;
    --light-text-muted: #64748b;
    --light-border: #e2e8f0;
    --light-glass-bg: rgba(255, 255, 255, 0.8);
    --light-glass-border: rgba(226, 232, 240, 0.6);
    --light-shadow: 0 10px 30px -10px rgba(15, 23, 42, 0.05);

    /* Common Dark Colors (Deep Navy / Space Theme) */
    --dark-bg-primary: #030712;
    --dark-bg-secondary: #0b1528;
    --dark-bg-tertiary: #111e35;
    --dark-text-primary: #f8fafc;
    --dark-text-secondary: #94a3b8;
    --dark-text-muted: #64748b;
    --dark-border: #1e293b;
    --dark-glass-bg: rgba(11, 21, 40, 0.85);
    --dark-glass-border: rgba(30, 41, 59, 0.5);
    --dark-shadow: 0 20px 45px -15px rgba(0, 0, 0, 0.5);

    /* Brand Accent Colors */
    --color-primary: #3b82f6;       /* Blue Accent (Clean energy) */
    --color-primary-rgb: 59, 130, 246;
    --color-secondary: #10b981;     /* Emerald Green (Batteries/Environment) */
    --color-secondary-rgb: 16, 185, 129;
    --color-warning: #f59e0b;       /* Amber */
    --color-error: #ef4444;         /* Rose */
    
    /* UI Configs */
    --border-radius-sm: 6px;
    --border-radius-md: 12px;
    --border-radius-lg: 20px;
    --border-radius-circle: 50%;
    
    --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
    
    --max-width: 1100px;
    --header-height: 80px;
}

/* Theme Mappings */
[data-theme="dark"] {
    --bg-primary: var(--dark-bg-primary);
    --bg-secondary: var(--dark-bg-secondary);
    --bg-tertiary: var(--dark-bg-tertiary);
    --text-primary: var(--dark-text-primary);
    --text-secondary: var(--dark-text-secondary);
    --text-muted: var(--dark-text-muted);
    --border-color: var(--dark-border);
    --glass-bg: var(--dark-glass-bg);
    --glass-border: var(--dark-glass-border);
    --shadow: var(--dark-shadow);
    --glow-opacity: 0.12;
}

[data-theme="light"] {
    --bg-primary: var(--light-bg-primary);
    --bg-secondary: var(--light-bg-secondary);
    --bg-tertiary: var(--light-bg-tertiary);
    --text-primary: var(--light-text-primary);
    --text-secondary: var(--light-text-secondary);
    --text-muted: var(--light-text-muted);
    --border-color: var(--light-border);
    --glass-bg: var(--light-glass-bg);
    --glass-border: var(--light-glass-border);
    --shadow: var(--light-shadow);
    --glow-opacity: 0.03;
}

/* ==========================================================================
   RESET & GLOBAL STYLES
   ========================================================================== */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-primary);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.62;
    overflow-x: hidden;
    transition: background-color var(--transition-normal), color var(--transition-normal);
}

a {
    color: inherit;
    text-decoration: none;
    transition: color var(--transition-fast);
}

button, input, textarea {
    font-family: inherit;
    background: none;
    border: none;
    color: inherit;
}

button {
    cursor: pointer;
}

ul {
    list-style: none;
}

/* Container */
.container {
    width: 100%;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
}

/* Scroll Progress Bar */
.scroll-progress {
    position: fixed;
    top: 0;
    left: 0;
    width: 0%;
    height: 3px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-secondary));
    z-index: 1001;
    transition: width 0.1s ease-out;
}

/* Highlight text */
.highlight {
    background: linear-gradient(90deg, var(--color-primary), var(--color-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Section Padding */
section {
    padding: 80px 0;
    position: relative;
}

.section-alt {
    background-color: var(--bg-secondary);
}

/* ==========================================================================
   COMPONENTS: BUTTONS & BADGES
   ========================================================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 24px;
    font-size: 0.9rem;
    font-weight: 600;
    border-radius: var(--border-radius-sm);
    transition: all var(--transition-fast);
}

.btn-primary {
    background: linear-gradient(135deg, var(--color-primary), #2563eb);
    color: #ffffff;
    box-shadow: 0 4px 12px rgba(var(--color-primary-rgb), 0.2);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 18px rgba(var(--color-primary-rgb), 0.35);
}

.btn-outline {
    border: 1px solid var(--border-color);
    color: var(--text-primary);
}

.btn-outline:hover {
    background-color: var(--bg-tertiary);
    border-color: var(--color-primary);
}

.btn-block {
    width: 100%;
}

.badge {
    background-color: var(--bg-tertiary);
    color: var(--text-secondary);
    font-size: 0.75rem;
    font-weight: 600;
    padding: 4px 10px;
    border-radius: 4px;
    border: 1px solid var(--border-color);
    display: inline-block;
    transition: all var(--transition-fast);
}

.badge-primary {
    background-color: rgba(var(--color-primary-rgb), 0.1);
    color: var(--color-primary);
    border-color: rgba(var(--color-primary-rgb), 0.2);
}

.badge-secondary {
    background-color: rgba(var(--color-secondary-rgb), 0.1);
    color: var(--color-secondary);
    border-color: rgba(var(--color-secondary-rgb), 0.2);
}

/* ==========================================================================
   LAYOUT: NAVBAR
   ========================================================================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--header-height);
    background-color: transparent;
    z-index: 1000;
    transition: all var(--transition-normal);
    display: flex;
    align-items: center;
}

.navbar.scrolled {
    background-color: var(--glass-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--glass-border);
    height: 70px;
    box-shadow: var(--shadow);
}

.nav-container {
    width: 100%;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    font-size: 1.25rem;
    font-weight: 800;
    color: var(--text-primary);
}

.logo span {
    color: var(--color-primary);
    font-weight: 500;
}

.nav-menu {
    display: flex;
    gap: 28px;
}

.nav-link {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-secondary);
    position: relative;
    padding: 8px 0;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0%;
    height: 2px;
    background-color: var(--color-primary);
    transition: width var(--transition-fast);
}

.nav-link:hover,
.nav-link.active {
    color: var(--text-primary);
}

.nav-link.active::after {
    width: 100%;
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 12px;
}

/* Theme Toggle Button */
.theme-toggle {
    width: 36px;
    height: 36px;
    border-radius: var(--border-radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    transition: all var(--transition-fast);
}

.theme-toggle:hover {
    color: var(--color-primary);
    border-color: var(--color-primary);
    transform: scale(1.05);
}

[data-theme="dark"] .sun-icon { display: block; }
[data-theme="dark"] .moon-icon { display: none; }
[data-theme="light"] .sun-icon { display: none; }
[data-theme="light"] .moon-icon { display: block; }

/* Mobile Menu Toggle Button */
.mobile-menu-toggle {
    display: none;
    width: 36px;
    height: 36px;
    border-radius: var(--border-radius-sm);
    align-items: center;
    justify-content: center;
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    transition: all var(--transition-fast);
}

.hidden {
    display: none !important;
}

/* ==========================================================================
   SECTIONS: HOME / WELCOME (INDEX.HTML)
   ========================================================================== */
.hero-section {
    min-height: 90vh;
    display: flex;
    align-items: center;
    padding-top: calc(var(--header-height) + 20px);
    overflow: hidden;
}

.hero-bg-shapes {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    pointer-events: none;
}

.shape {
    position: absolute;
    border-radius: 50%;
    filter: blur(90px);
    opacity: var(--glow-opacity);
    transition: opacity var(--transition-normal);
}

.shape-1 {
    top: 10%;
    right: 10%;
    width: 350px;
    height: 350px;
    background-color: var(--color-primary);
}

.shape-2 {
    bottom: 15%;
    left: 5%;
    width: 300px;
    height: 300px;
    background-color: var(--color-secondary);
}

.hero-container {
    display: grid;
    grid-template-columns: 1fr;
    max-width: 800px;
    margin: 0 auto;
}

.hero-content {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}

.hero-subtitle {
    font-size: 0.8rem;
    font-weight: 700;
    letter-spacing: 1.5px;
    color: var(--color-primary);
    margin-bottom: 12px;
}

.hero-title {
    font-size: 2.8rem;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 16px;
    letter-spacing: -0.5px;
}

.hero-description {
    font-size: 1.15rem;
    color: var(--text-secondary);
    margin-bottom: 30px;
    line-height: 1.65;
    text-align: justify;
}

.hero-buttons {
    display: flex;
    gap: 12px;
    margin-bottom: 32px;
}

.hero-image-container {
    display: flex;
    justify-content: center;
    position: relative;
}

.hero-graphic {
    width: 100%;
    max-width: 380px;
    height: auto;
    filter: drop-shadow(0 15px 30px rgba(0,0,0,0.15));
    animation: float 6s ease-in-out infinite;
}

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

/* Home Section Headers */
.section-header {
    text-align: center;
    margin-bottom: 50px;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.section-subtitle {
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 2px;
    color: var(--color-primary);
    margin-bottom: 8px;
    text-transform: uppercase;
}

.section-title {
    font-size: 2rem;
    font-weight: 800;
    letter-spacing: -0.5px;
}

.section-divider {
    width: 50px;
    height: 3px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-secondary));
    border-radius: 2px;
    margin-top: 12px;
}

/* Home News Feed Highlight */
.news-summary-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin-bottom: 40px;
}

.news-summary-card {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    padding: 24px;
    box-shadow: var(--shadow);
    transition: transform var(--transition-fast), border-color var(--transition-fast);
    display: flex;
    flex-direction: column;
}

.news-summary-card:hover {
    transform: translateY(-4px);
    border-color: rgba(var(--color-primary-rgb), 0.3);
}

.news-date {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--color-primary);
    margin-bottom: 10px;
}

.news-summary-card h3 {
    font-size: 1.05rem;
    font-weight: 700;
    margin-bottom: 12px;
    line-height: 1.4;
}

.news-summary-card p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.5;
    flex-grow: 1;
}

/* ==========================================================================
   SECTIONS: PEOPLE (PEOPLE.HTML)
   ========================================================================== */
.pi-section {
    padding-top: calc(var(--header-height) + 40px);
}

.pi-grid {
    display: grid;
    grid-template-columns: 260px 1fr;
    gap: 32px;
    align-items: flex-start;
}

.pi-photo-card {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    padding: 20px;
    box-shadow: var(--shadow);
    text-align: center;
}

.pi-avatar {
    width: 140px;
    height: 182px;
    border-radius: var(--border-radius-md);
    margin: 0 auto 16px auto;
    background: linear-gradient(135deg, rgba(var(--color-primary-rgb), 0.1), rgba(var(--color-secondary-rgb), 0.1));
    display: flex;
    align-items: center;
    justify-content: center;
    border: 3px solid var(--border-color);
    overflow: hidden;
}

.pi-avatar svg {
    width: 60px;
    height: 60px;
    color: var(--color-primary);
}

.pi-photo-card h3 {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 4px;
}

.pi-photo-card p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 16px;
}

.pi-social-links {
    display: flex;
    justify-content: center;
    gap: 12px;
}

.pi-social-btn {
    width: 32px;
    height: 32px;
    border-radius: var(--border-radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--border-color);
    background-color: var(--bg-primary);
    color: var(--text-secondary);
    transition: all var(--transition-fast);
}

.pi-social-btn:hover {
    color: #ffffff;
    background-color: var(--color-primary);
    border-color: var(--color-primary);
    transform: translateY(-2px);
}

.pi-details h2 {
    font-size: 1.75rem;
    font-weight: 800;
    margin-bottom: 8px;
}

.pi-title-sub {
    font-size: 1.05rem;
    color: var(--color-primary);
    font-weight: 600;
    line-height: 1.6;
    margin-bottom: 16px;
}

.pi-info-block {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    margin-bottom: 20px;
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
    padding: 12px 0;
}

.pi-info-item {
    display: flex;
    gap: 10px;
    font-size: 0.92rem;
}

.pi-info-item svg {
    width: 16px;
    height: 16px;
    color: var(--color-primary);
    flex-shrink: 0;
}

.pi-info-item span {
    font-weight: 600;
    color: var(--text-primary);
}

.pi-bio-section {
    margin-top: 20px;
}

.pi-bio-section h3 {
    font-size: 1.15rem;
    font-weight: 700;
    margin-bottom: 10px;
    border-left: 3px solid var(--color-primary);
    padding-left: 10px;
}

.pi-list {
    margin-bottom: 16px;
}

.pi-list-item {
    position: relative;
    padding-left: 20px;
    font-size: 0.95rem;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.pi-list-item::before {
    content: '';
    position: absolute;
    left: 0;
    top: 8px;
    width: 5px;
    height: 5px;
    border-radius: 50%;
    background-color: var(--color-primary);
}

/* Members Grid */
.members-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.member-card {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    padding: 24px;
    box-shadow: var(--shadow);
    text-align: center;
    transition: transform var(--transition-fast), border-color var(--transition-fast);
}

.member-card:hover {
    transform: translateY(-4px);
    border-color: rgba(var(--color-primary-rgb), 0.25);
}

.member-avatar {
    width: 150px;
    height: 195px;
    border-radius: var(--border-radius-md);
    margin: 0 auto 16px auto;
    background: linear-gradient(135deg, rgba(var(--color-primary-rgb), 0.05), rgba(var(--color-secondary-rgb), 0.05));
    display: flex;
    align-items: center;
    justify-content: center;
    border: 2px solid var(--border-color);
    overflow: hidden;
}

.member-avatar svg {
    width: 56px;
    height: 56px;
    color: var(--text-muted);
}

.member-name {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 4px;
}

.member-role {
    font-size: 0.85rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--color-primary);
    margin-bottom: 12px;
}

.member-program {
    font-size: 0.95rem;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.member-interest {
    font-size: 0.88rem;
    color: var(--text-muted);
    font-style: italic;
    margin-bottom: 14px;
    line-height: 1.4;
}

.member-email {
    font-size: 0.88rem;
    color: var(--text-secondary);
    display: inline-flex;
    align-items: center;
    gap: 4px;
}

.member-email svg {
    width: 14px;
    height: 14px;
}

/* Alumni Section */
.alumni-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.alumni-card {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    padding: 20px;
    box-shadow: var(--shadow);
    display: flex;
    gap: 16px;
    align-items: center;
}

.alumni-icon-box {
    width: 140px;
    height: 182px;
    border-radius: var(--border-radius-md);
    background-color: var(--bg-tertiary);
    color: var(--color-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    overflow: hidden;
    border: 1px solid var(--border-color);
}

.alumni-icon-box svg {
    width: 48px;
    height: 48px;
}

.alumni-info h4 {
    font-size: 1.2rem;
    font-weight: 700;
}

.alumni-desc {
    font-size: 0.95rem;
    color: var(--text-secondary);
}

.alumni-dest {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--color-secondary);
    margin-top: 2px;
}

/* Interns list */
.interns-container {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    padding: 24px;
    box-shadow: var(--shadow);
}

.interns-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
}

.intern-item {
    font-size: 0.9rem;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 8px;
}

.intern-item::before {
    content: '•';
    color: var(--color-primary);
    font-weight: bold;
}

/* ==========================================================================
   SECTIONS: RESEARCH (RESEARCH.HTML)
   ========================================================================== */
.research-area {
    margin-bottom: 60px;
}

.research-area:last-child {
    margin-bottom: 0;
}

.research-card-layout {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    padding: 40px;
    box-shadow: var(--shadow);
    display: grid;
    grid-template-columns: 300px 1fr;
    gap: 40px;
    align-items: center;
    transition: border-color var(--transition-fast);
}

.research-card-layout:hover {
    border-color: rgba(var(--color-primary-rgb), 0.25);
}

.research-image-wrapper {
    width: 100%;
    aspect-ratio: 4/3;
    background-color: var(--bg-tertiary);
    border: 2px dashed var(--border-color);
    border-radius: var(--border-radius-md);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
    gap: 12px;
    padding: 20px;
    text-align: center;
    transition: all var(--transition-fast);
}

.research-image-wrapper.has-image {
    aspect-ratio: auto;
    height: auto;
    border-style: solid;
}

.research-image-wrapper:hover {
    border-color: var(--color-primary);
    color: var(--text-secondary);
    background-color: rgba(var(--color-primary-rgb), 0.02);
}

.research-image-wrapper svg {
    width: 48px;
    height: 48px;
    color: var(--text-muted);
    opacity: 0.7;
}

.research-image-wrapper span {
    font-size: 0.85rem;
    font-weight: 500;
}

.research-info h3 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 8px;
}

.research-info p {
    color: var(--text-secondary);
    line-height: 1.5;
    font-size: 0.95rem;
    text-align: justify;
}

/* ==========================================================================
   SECTIONS: PUBLICATIONS (PUBLICATIONS.HTML)
   ========================================================================== */
.search-filter-wrapper {
    display: flex;
    flex-direction: column;
    gap: 20px;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    padding: 24px;
    margin-bottom: 40px;
    box-shadow: var(--shadow);
}

.search-box {
    position: relative;
    width: 100%;
}

.search-box input {
    width: 100%;
    padding: 12px 16px 12px 48px;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-size: 0.95rem;
    transition: all var(--transition-fast);
}

.search-box input:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(var(--color-primary-rgb), 0.1);
}

.search-box svg {
    position: absolute;
    left: 16px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
    width: 20px;
    height: 20px;
    pointer-events: none;
}

.year-filter-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.year-btn {
    padding: 6px 14px;
    border-radius: 4px;
    font-size: 0.85rem;
    font-weight: 600;
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    transition: all var(--transition-fast);
}

.year-btn:hover {
    color: var(--text-primary);
    border-color: var(--color-primary);
}

.year-btn.active {
    color: #ffffff;
    background-color: var(--color-primary);
    border-color: var(--color-primary);
}

/* Publications List */
.publications-container {
    display: flex;
    flex-direction: column;
    gap: 40px;
}

.publication-year-group h3 {
    font-size: 1.5rem;
    font-weight: 800;
    margin-bottom: 20px;
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 8px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.publication-year-group h3::after {
    content: '';
    flex-grow: 1;
    height: 1px;
    background-color: var(--border-color);
}

.pub-list {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.pub-item {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    padding: 24px;
    box-shadow: var(--shadow);
    transition: transform var(--transition-fast), border-color var(--transition-fast);
    position: relative;
    display: block;
}

.pub-info {
    display: flex;
    flex-direction: column;
}

.pub-image-wrapper {
    display: none !important;
}

.pub-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.pub-img-placeholder {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    width: 100%;
    height: 100%;
    color: var(--text-muted);
    font-size: 0.7rem;
    font-weight: 600;
    gap: 4px;
}

.pub-img-placeholder svg {
    width: 20px;
    height: 20px;
}

.pub-item:hover {
    transform: translateX(4px);
    border-color: rgba(var(--color-primary-rgb), 0.25);
}

.pub-title {
    font-size: 1.05rem;
    font-weight: 700;
    margin-bottom: 8px;
    line-height: 1.4;
    color: var(--text-primary);
}

.pub-authors {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 6px;
}

.pub-authors strong {
    color: var(--text-primary);
}

.pub-journal {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--color-primary);
    margin-bottom: 12px;
}

.pub-meta-badges {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.pub-item.hidden {
    display: none !important;
}

.pub-no-results {
    text-align: center;
    padding: 40px;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    color: var(--text-muted);
}

/* ==========================================================================
   SECTIONS: NEWS (NEWS.HTML)
   ========================================================================== */
.news-timeline {
    position: relative;
    border-left: 2px solid var(--border-color);
    padding-left: 32px;
    margin-left: 10px;
}

.news-timeline-item {
    position: relative;
    margin-bottom: 40px;
}

.news-timeline-item:last-child {
    margin-bottom: 0;
}

.news-timeline-dot {
    position: absolute;
    left: -42px;
    top: 5px;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background-color: var(--bg-primary);
    border: 4px solid var(--color-primary);
    transition: all var(--transition-fast);
}

.news-timeline-item:hover .news-timeline-dot {
    background-color: var(--color-primary);
    box-shadow: 0 0 10px rgba(var(--color-primary-rgb), 0.5);
}

.news-timeline-date {
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: 8px;
    display: inline-block;
}

.news-timeline-content {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    padding: 24px;
    box-shadow: var(--shadow);
}

.news-timeline-content h3 {
    font-size: 1.15rem;
    font-weight: 700;
    margin-bottom: 12px;
}

.news-timeline-content p {
    font-size: 0.95rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

.news-timeline-content a {
    color: var(--color-primary);
    text-decoration: underline;
    font-weight: 600;
    margin: 0 4px;
    transition: color var(--transition-fast);
}

.news-timeline-content a:hover {
    color: var(--color-secondary);
}

/* ==========================================================================
   SECTIONS: PHOTOS / GALLERY (PHOTOS.HTML)
   ========================================================================== */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 30px;
    margin-top: 20px;
}

.project-card {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: transform var(--transition-fast), border-color var(--transition-fast);
    display: flex;
    flex-direction: column;
}

.project-card:hover {
    transform: translateY(-4px);
    border-color: rgba(var(--color-primary-rgb), 0.25);
}

.project-image-box img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center;
    transition: transform var(--transition-normal);
}

.project-card:hover .project-image-box img {
    transform: scale(1.05);
}

.project-info {
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 8px;
    flex-grow: 1;
}

.project-category {
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--color-primary);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.project-title {
    font-size: 1.1rem;
    font-weight: 700;
    line-height: 1.4;
    color: var(--text-primary);
}

/* ==========================================================================
   SECTIONS: OPENING (OPENING.HTML)
   ========================================================================== */
.opening-grid {
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    gap: 48px;
}

.opening-card {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    padding: 40px;
    box-shadow: var(--shadow);
    margin-bottom: 30px;
}

.opening-card:last-child {
    margin-bottom: 0;
}

.opening-card h3 {
    font-size: 1.35rem;
    font-weight: 700;
    margin-bottom: 20px;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 10px;
}

.opening-list-num {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.opening-step {
    display: flex;
    gap: 16px;
}

.step-number {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background-color: rgba(var(--color-primary-rgb), 0.1);
    color: var(--color-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    flex-shrink: 0;
}

.step-details h4 {
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: 4px;
}

.step-details p {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.opening-sidebar {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.sidebar-box {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    padding: 28px;
    box-shadow: var(--shadow);
}

.sidebar-box h4 {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 16px;
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--color-primary);
}

.contact-info-list {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.contact-info-item {
    display: flex;
    gap: 12px;
    font-size: 0.9rem;
}

.contact-info-item svg {
    color: var(--color-primary);
    flex-shrink: 0;
    width: 18px;
    height: 18px;
}

.contact-info-item p {
    margin-bottom: 0;
}

.contact-info-item a {
    color: var(--color-primary);
    font-weight: 600;
}

/* Interactive Contact Form */
.contact-form {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.form-group label {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-secondary);
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 10px 14px;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-size: 0.9rem;
    transition: all var(--transition-fast);
}

.form-group textarea {
    resize: none;
}

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

.form-group.has-error input,
.form-group.has-error select,
.form-group.has-error textarea {
    border-color: var(--color-error);
    box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.1);
}

.error-msg {
    font-size: 0.75rem;
    color: var(--color-error);
    margin-top: 4px;
    display: none;
}

.form-group.has-error .error-msg {
    display: block;
}

/* ==========================================================================
   LAYOUT: FOOTER
   ========================================================================== */
.footer {
    background-color: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: 50px 0 30px 0;
    margin-top: 60px;
}

.footer-container {
    display: flex;
    flex-direction: column;
    gap: 30px;
}

.footer-top {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
}

.footer-logo-box {
    max-width: 400px;
}

.footer-logo-box p {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-top: 8px;
}

.footer-links {
    display: flex;
    gap: 20px;
}

.footer-links a {
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.footer-links a:hover {
    color: var(--color-primary);
}

.footer-bottom {
    border-top: 1px solid var(--border-color);
    padding-top: 20px;
    display: flex;
    justify-content: space-between;
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* ==========================================================================
   COMPONENTS: MODALS (SUCCESS POPUP)
   ========================================================================== */
.modal-backdrop {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(3, 7, 18, 0.6);
    backdrop-filter: blur(6px);
    -webkit-backdrop-filter: blur(6px);
    z-index: 2000;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-normal);
}

.modal-backdrop:not(.hidden) {
    opacity: 1;
    pointer-events: auto;
}

.modal {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    width: 90%;
    max-width: 400px;
    box-shadow: var(--shadow);
    transform: scale(0.95);
    transition: transform var(--transition-normal);
    overflow: hidden;
}

.modal-backdrop:not(.hidden) .modal {
    transform: scale(1);
}

.modal-header {
    padding: 24px 24px 16px 24px;
    display: flex;
    justify-content: center;
}

.modal-success-icon {
    width: 54px;
    height: 54px;
    border-radius: 50%;
    background-color: rgba(16, 185, 129, 0.1);
    color: var(--color-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-success-icon svg {
    width: 28px;
    height: 28px;
}

.modal-body {
    padding: 0 24px 20px 24px;
    text-align: center;
}

.modal-body h3 {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 8px;
}

.modal-body p {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.modal-footer {
    padding: 16px 24px 24px 24px;
    display: flex;
    justify-content: center;
    border-top: 1px solid var(--border-color);
}

/* ==========================================================================
   MEDIA QUERIES (RESPONSIVE STYLES)
   ========================================================================== */
@media (max-width: 1024px) {
    .hero-title {
        font-size: 2.4rem;
    }
}

@media (max-width: 991px) {
    section {
        padding: 60px 0;
    }

    .hero-container {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 32px;
    }

    .hero-content {
        align-items: center;
    }

    .hero-image-container {
        order: -1;
    }

    .news-summary-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .pi-grid {
        grid-template-columns: 1fr;
        gap: 30px;
    }

    .members-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .opening-grid {
        grid-template-columns: 1fr;
    }

    .projects-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 20px;
    }
}

@media (max-width: 768px) {
    /* Mobile Menu Toggle Navigation */
    .mobile-menu-toggle {
        display: flex;
    }

    .nav-menu {
        position: fixed;
        top: var(--header-height);
        left: -100%;
        width: 100%;
        height: calc(100vh - var(--header-height));
        background-color: var(--bg-secondary);
        border-top: 1px solid var(--border-color);
        flex-direction: column;
        align-items: center;
        padding-top: 30px;
        gap: 20px;
        transition: left var(--transition-normal);
        z-index: 999;
    }

    .nav-menu.open {
        left: 0;
    }

    .nav-link {
        font-size: 1.1rem;
    }

    .news-summary-grid {
        grid-template-columns: 1fr;
    }

    .research-card-layout {
        grid-template-columns: 1fr;
        gap: 20px;
        padding: 30px;
    }

    .research-image-wrapper {
        aspect-ratio: 16/9;
        max-width: 400px;
        margin: 0 auto;
    }

    .alumni-grid {
        grid-template-columns: 1fr;
    }

    .pub-item {
        grid-template-columns: 1fr;
        gap: 16px;
        justify-items: start;
    }

    .pub-image-wrapper {
        width: 100%;
        height: 120px;
        max-width: 200px;
    }

    .interns-grid {
        grid-template-columns: 1fr;
    }

    .projects-grid {
        grid-template-columns: 1fr;
    }

    .footer-top {
        flex-direction: column;
        gap: 20px;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 1.85rem;
    }

    .hero-buttons {
        flex-direction: column;
        width: 100%;
    }

    .hero-buttons .btn {
        width: 100%;
    }

    .members-grid {
        grid-template-columns: 1fr;
    }

    .footer-bottom {
        flex-direction: column;
        align-items: center;
        gap: 10px;
        text-align: center;
    }
}