/* =====================================================
   УЗЛУКСИЗ ТИББИЙ ТАЪЛИМ ПОРТАЛИ — Design System
   Senior-level CSS Architecture
   ===================================================== */

/* === 1. CSS Custom Properties (Design Tokens) === */
:root {
    /* Brand Colors */
    --primary: #1a73e8;
    --primary-dark: #1557c0;
    --primary-light: #e8f0fe;
    --accent: #00c9a7;
    --accent-dark: #00a88a;

    /* Neutral Palette */
    --dark: #0f1623;
    --dark-2: #1b273d;
    --dark-3: #2d3748;
    --body-text: #374151;
    --muted: #6b7280;
    --muted-light: #9ca3af;
    --border: rgba(0, 0, 0, 0.06);
    --border-strong: rgba(0, 0, 0, 0.1);
    --white: #ffffff;
    --off-white: #f8faff;
    --surface: #f4f7fb;

    /* Card Pastel Backgrounds */
    --card-blue: #eef2ff;
    --card-pink: #fff0f3;
    --card-purple: #f5f3ff;
    --card-green: #ecfdf5;

    /* Gradients */
    --gradient-hero: linear-gradient(135deg, #0d5c9c 0%, #0a9f86 50%, #1a73e8 100%);
    --gradient-brand: linear-gradient(135deg, #1a73e8 0%, #00c9a7 100%);
    --gradient-footer: linear-gradient(160deg, #0f1623 0%, #162033 100%);

    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 20px 50px rgba(0, 0, 0, 0.10);
    --shadow-xl: 0 30px 70px rgba(0, 0, 0, 0.14);
    --shadow-primary: 0 8px 25px rgba(26, 115, 232, 0.30);
    --shadow-primary-lg: 0 15px 40px rgba(26, 115, 232, 0.40);

    /* Radii */
    --radius-sm: 10px;
    --radius-md: 18px;
    --radius-lg: 28px;
    --radius-xl: 40px;
    --radius-full: 100px;

    /* Spacing */
    --section-py: clamp(4rem, 8vw, 7rem);
    --container-px: clamp(1.25rem, 4vw, 2.5rem);
    --container-max: 1320px;

    /* Typography Scale */
    --text-xs: 0.75rem;
    --text-sm: 0.875rem;
    --text-base: 1rem;
    --text-md: 1.125rem;
    --text-lg: 1.25rem;
    --text-xl: 1.5rem;
    --text-2xl: 2rem;
    --text-3xl: 2.75rem;
    --text-4xl: 3.5rem;
    --text-hero: clamp(2.4rem, 5vw, 4rem);

    /* Transitions */
    --transition: all 0.3s ease;
    --transition-bounce: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    --ease-smooth: cubic-bezier(0.4, 0, 0.2, 1);
}

/* === 2. Reset & Base === */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

body.portal-body,
body.login-page {
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    color: var(--body-text);
    background: var(--white);
    line-height: 1.65;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
}

img { max-width: 100%; display: block; }
a { color: inherit; transition: var(--transition); }

.landing-page {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* === 3. Container === */
.container,
.nav-container,
.footer-top,
.footer-nav-container {
    width: 100%;
    max-width: var(--container-max);
    margin-left: auto;
    margin-right: auto;
    padding-left: var(--container-px);
    padding-right: var(--container-px);
}

/* === 4. Header / Navigation === */
.landing-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 0.85rem 0;
    background: transparent;
    transition: background 0.4s ease, box-shadow 0.4s ease, padding 0.4s ease;
}

.landing-header.scrolled {
    background: rgba(255, 255, 255, 0.96);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.08);
    padding: 0.6rem 0;
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
}

/* Logo */
.logo {
    display: flex;
    align-items: center;
    gap: 0.85rem;
    text-decoration: none;
    flex-shrink: 0;
}

.logo img {
    height: 46px;
    width: auto;
    object-fit: contain;
    filter: drop-shadow(0 2px 4px rgba(0,0,0,0.15));
    transition: var(--transition);
}

.logo-text {
    font-size: 0.8rem;
    font-weight: 800;
    color: white;
    max-width: 200px;
    line-height: 1.25;
    letter-spacing: 0.01em;
    text-transform: uppercase;
    transition: color 0.4s ease;
}

.landing-header.scrolled .logo-text {
    color: var(--dark-2);
}

/* Nav Links */
.nav-menu {
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.nav-link {
    text-decoration: none;
    color: rgba(255, 255, 255, 0.9);
    font-weight: 600;
    font-size: var(--text-sm);
    padding: 0.5rem 1rem;
    border-radius: var(--radius-full);
    transition: var(--transition);
    letter-spacing: 0.01em;
}

.landing-header.scrolled .nav-link {
    color: var(--dark-3);
}

.nav-link:hover,
.nav-link.active {
    color: white !important;
    background: rgba(255, 255, 255, 0.18);
    text-shadow: 0 0 12px rgba(255,255,255,0.4);
}

.landing-header.scrolled .nav-link:hover,
.landing-header.scrolled .nav-link.active {
    color: var(--primary) !important;
    background: var(--primary-light);
    text-shadow: none;
}

/* Login Button */
.btn-login {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.6rem 1.5rem;
    background: white;
    color: var(--primary) !important;
    border-radius: var(--radius-full);
    text-decoration: none;
    font-weight: 700;
    font-size: var(--text-sm);
    box-shadow: var(--shadow-md);
    transition: var(--transition-bounce);
    white-space: nowrap;
    margin-left: 0.75rem;
}

.landing-header.scrolled .btn-login {
    background: var(--primary);
    color: white !important;
}

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

/* Mobile Burger */
.nav-burger {
    display: none;
    background: rgba(255, 255, 255, 0.15);
    border: 1px solid rgba(255, 255, 255, 0.3);
    color: white;
    width: 40px;
    height: 40px;
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 1.1rem;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.landing-header.scrolled .nav-burger {
    background: var(--primary-light);
    color: var(--primary);
    border-color: transparent;
}

/* === 5. Hero Section === */
.hero-wrapper {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    position: relative;
    padding: 100px 0 80px;
    overflow: hidden;
    /* Animated mesh gradient */
    background-color: #0c4fa0;
    background-image:
        radial-gradient(at 0% 0%, hsla(212, 97%, 30%, 0.95) 0, transparent 55%),
        radial-gradient(at 55% 0%, hsla(170, 100%, 38%, 0.85) 0, transparent 50%),
        radial-gradient(at 100% 30%, hsla(227, 95%, 58%, 0.90) 0, transparent 50%),
        radial-gradient(at 20% 100%, hsla(174, 88%, 32%, 0.80) 0, transparent 55%),
        radial-gradient(at 80% 80%, hsla(200, 80%, 45%, 0.75) 0, transparent 50%);
    color: white;
}

/* Decorative blobs */
.hero-wrapper::before {
    content: '';
    position: absolute;
    width: 700px;
    height: 700px;
    background: radial-gradient(circle, rgba(0, 201, 167, 0.18) 0%, transparent 65%);
    top: -200px;
    right: -100px;
    border-radius: 50%;
    pointer-events: none;
    animation: blobFloat 18s ease-in-out infinite alternate;
}

.hero-wrapper::after {
    content: '';
    position: absolute;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(26, 115, 232, 0.20) 0%, transparent 65%);
    bottom: -150px;
    left: -50px;
    border-radius: 50%;
    pointer-events: none;
    animation: blobFloat 22s ease-in-out infinite alternate-reverse;
}

@keyframes blobFloat {
    0%   { transform: translate(0, 0) scale(1); }
    50%  { transform: translate(30px, -20px) scale(1.05); }
    100% { transform: translate(50px, 40px) scale(0.97); }
}

/* Hero Content Layout */
.hero-content {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--container-px);
    display: grid;
    grid-template-columns: 1fr 0.85fr;
    align-items: center;
    gap: clamp(2rem, 5vw, 5rem);
    position: relative;
    z-index: 2;
}

/* Text Column */
.text-col {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.text-col h1 {
    font-size: var(--text-hero);
    font-weight: 900;
    line-height: 1.15;
    letter-spacing: -0.02em;
    color: white;
    text-shadow: 0 3px 15px rgba(0, 0, 0, 0.15);
}

.text-col > p {
    font-size: clamp(1rem, 1.5vw, 1.2rem);
    color: rgba(255, 255, 255, 0.88);
    line-height: 1.75;
    max-width: 55ch;
}

/* Hero Statistics */
.hero-stats {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
    margin-top: 1rem;
}

.stat-item {
    background: rgba(255, 255, 255, 0.12);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    padding: 1.25rem 1.5rem;
    border-radius: var(--radius-md);
    border: 1px solid rgba(255, 255, 255, 0.18);
    transition: var(--transition);
    cursor: default;
    display: flex;
    align-items: center;
    gap: 1rem;
}

.stat-item:hover {
    background: rgba(255, 255, 255, 0.20);
    transform: translateY(-3px);
}

.stat-icon {
    width: 46px;
    height: 46px;
    min-width: 46px;
    background: rgba(255, 255, 255, 0.18);
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.3rem;
    color: white;
    flex-shrink: 0;
    transition: var(--transition);
}

.stat-item:hover .stat-icon {
    background: rgba(255, 255, 255, 0.30);
    transform: scale(1.08);
}

.stat-text { display: flex; flex-direction: column; }

.stat-value {
    display: block;
    font-size: var(--text-2xl);
    font-weight: 900;
    line-height: 1;
    margin-bottom: 0.25rem;
    color: white;
}

.stat-label {
    display: block;
    font-size: 0.68rem;
    font-weight: 700;
    color: rgba(255, 255, 255, 0.72);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    line-height: 1.4;
}

/* === 6. Hero Slider (Glassmorphism) === */
.hero-visual {
    display: flex;
    align-items: center;
    justify-content: center;
}

.features-slider {
    width: 100%;
    max-width: 460px;
    background: rgba(255, 255, 255, 0.10);
    backdrop-filter: blur(30px);
    -webkit-backdrop-filter: blur(30px);
    border: 1px solid rgba(255, 255, 255, 0.22);
    border-radius: var(--radius-xl);
    padding: 3rem 0 2.5rem;
    box-shadow: 0 40px 80px rgba(0, 0, 0, 0.20);
    overflow: hidden;
    animation: slideInRight 0.9s var(--ease-smooth) both;
}

.slider-viewport {
    overflow: hidden;
    width: 100%;
}

@keyframes slideInRight {
    from { opacity: 0; transform: translateX(60px); }
    to   { opacity: 1; transform: translateX(0); }
}

.slider-track {
    display: flex;
    transition: transform 0.8s cubic-bezier(0.65, 0, 0.35, 1);
}

.slider-item {
    min-width: 100%;
    text-align: center;
    padding: 0 3rem;
    color: white;
}

.icon-box {
    width: 90px;
    height: 90px;
    background: white;
    border-radius: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 2rem;
    font-size: 2.4rem;
    color: var(--primary);
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.12);
    transition: transform 0.5s var(--ease-smooth);
}

.slider-item:hover .icon-box {
    transform: rotate(8deg) scale(1.08);
}

.slider-item h3 {
    font-size: var(--text-xl);
    font-weight: 800;
    margin-bottom: 1rem;
    color: white;
}

.slider-item p {
    font-size: 1rem;
    color: rgba(255, 255, 255, 0.88);
    line-height: 1.7;
}

.slider-dots {
    display: flex;
    justify-content: center;
    gap: 0.6rem;
    margin-top: 2.5rem;
}

.dot {
    width: 8px;
    height: 8px;
    background: rgba(255, 255, 255, 0.30);
    border-radius: 50%;
    cursor: pointer;
    transition: var(--transition);
}

.dot.active {
    background: white;
    width: 28px;
    border-radius: 10px;
}

/* === 7. Section Layout === */
.grid-section {
    padding: calc(var(--section-py) * 0.6) 0 var(--section-py);
    position: relative;
    overflow: hidden;
}

/* Mesh Animated Background */
.mesh-section {
    background: var(--white);
}

.mesh-section::before {
    content: '';
    position: absolute;
    width: 650px; height: 650px;
    background: radial-gradient(circle, rgba(0, 201, 167, 0.10) 0%, transparent 70%);
    top: -200px; left: -200px;
    border-radius: 50%;
    z-index: 0;
    pointer-events: none;
    animation: meshFloat 16s ease-in-out infinite alternate;
}

.mesh-section::after {
    content: '';
    position: absolute;
    width: 550px; height: 550px;
    background: radial-gradient(circle, rgba(26, 115, 232, 0.08) 0%, transparent 70%);
    top: 60px; right: -180px;
    border-radius: 50%;
    z-index: 0;
    pointer-events: none;
    animation: meshFloat 20s ease-in-out infinite alternate-reverse;
}

.mesh-blob-bottom {
    position: absolute;
    width: 600px; height: 600px;
    background: radial-gradient(circle, rgba(160, 120, 255, 0.08) 0%, transparent 70%);
    bottom: -250px; left: -100px;
    border-radius: 50%;
    z-index: 0;
    pointer-events: none;
    animation: meshFloat 24s ease-in-out infinite alternate;
}

@keyframes meshFloat {
    0%   { transform: translate(0, 0); }
    100% { transform: translate(40px, 35px); }
}

.grid-section > *:not(.mesh-blob-bottom) { position: relative; z-index: 1; }
.mesh-blob-bottom { position: absolute; z-index: 0; }

#cycles {
    padding-top: 2rem !important;
}

#books {
    padding-top: 2rem !important;
}

/* Section Titles */
.portal-title-container {
    text-align: center;
    margin-bottom: clamp(2.5rem, 5vw, 4.5rem);
    padding: 0 var(--container-px);
}

.portal-title {
    font-size: clamp(2rem, 4vw, 3.25rem);
    font-weight: 900;
    color: var(--dark-2);
    line-height: 1.2;
    letter-spacing: -0.02em;
    margin-bottom: 1rem;
}

.portal-title span {
    color: var(--primary);
    position: relative;
}

.portal-subtitle {
    font-size: clamp(1rem, 1.5vw, 1.2rem);
    color: var(--muted);
    max-width: 70ch;
    margin: 0 auto;
    line-height: 1.75;
}

/* === 8. Card Grid === */
.grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(min(100%, 340px), 1fr));
    gap: clamp(1.5rem, 3vw, 2.5rem);
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--container-px);
}

/* === 9. Cycle / Course Cards === */
.card {
    border-radius: var(--radius-xl);
    padding: clamp(2rem, 3vw, 3rem);
    display: flex;
    flex-direction: column;
    transition: transform 0.4s var(--ease-smooth), box-shadow 0.4s var(--ease-smooth);
    border: 1px solid transparent;
    position: relative;
    overflow: hidden;
}

.card::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: inherit;
    opacity: 0;
    transition: opacity 0.4s ease;
    background: var(--gradient-brand);
    z-index: 0;
}

.card:hover {
    transform: translateY(-12px);
    box-shadow: var(--shadow-xl);
}

.card-blue   { background: var(--card-blue);   box-shadow: var(--shadow-sm); }
.card-pink   { background: var(--card-pink);   box-shadow: var(--shadow-sm); }
.card-purple { background: var(--card-purple); box-shadow: var(--shadow-sm); }
.card-green  { background: var(--card-green);  box-shadow: var(--shadow-sm); }
.card-white  { background: var(--white);       box-shadow: var(--shadow-md); }

.card > * { position: relative; z-index: 1; }

.card-tag {
    display: inline-flex;
    align-items: center;
    font-size: var(--text-xs);
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--primary);
    background: white;
    padding: 0.45rem 1.1rem;
    border-radius: var(--radius-full);
    margin-bottom: 1.25rem;
    box-shadow: var(--shadow-sm);
    width: fit-content;
}

.card h3 {
    font-size: var(--text-lg);
    font-weight: 800;
    line-height: 1.35;
    color: var(--dark-2);
    margin-bottom: 1.25rem;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    min-height: 2.8em;
}

.card-meta {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    background: rgba(255, 255, 255, 0.65);
    padding: 1.25rem;
    border-radius: var(--radius-md);
    flex-grow: 1;
    margin-bottom: 1.75rem;
    backdrop-filter: blur(4px);
}

.card-meta div {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: var(--text-sm);
    color: var(--dark-3);
    font-weight: 500;
}

.card-meta i {
    color: var(--primary);
    width: 18px;
    flex-shrink: 0;
    font-size: 1rem;
}

/* Call-to-Action Pill Button */
.btn-pill {
    display: inline-flex;
    align-items: center;
    gap: 0.625rem;
    padding: 0.85rem 2rem;
    background: white;
    color: var(--dark-2);
    border-radius: var(--radius-full);
    text-decoration: none;
    font-weight: 700;
    font-size: var(--text-sm);
    box-shadow: var(--shadow-md);
    transition: var(--transition-bounce);
    width: fit-content;
}

.btn-pill:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-primary);
    color: var(--primary);
}

/* "View All" Button */
.btn-all-container {
    text-align: center;
    margin-top: clamp(2.5rem, 5vw, 4rem);
}

.btn-all {
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    padding: 1rem 3rem;
    background: var(--gradient-brand);
    color: white !important;
    border-radius: var(--radius-full);
    text-decoration: none;
    font-weight: 800;
    font-size: var(--text-base);
    letter-spacing: 0.01em;
    box-shadow: var(--shadow-primary);
    transition: var(--transition-bounce);
    border: none;
    cursor: pointer;
}

.btn-all:hover {
    transform: translateY(-4px) scale(1.02);
    box-shadow: var(--shadow-primary-lg);
    color: white !important;
}

.btn-all i { transition: transform 0.3s ease; }
.btn-all:hover i { transform: translateX(5px); }

/* === 10. University / Center Cards === */
.center-card {
    background: var(--white);
    border-radius: var(--radius-lg);
    padding: 2rem;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    min-height: 280px;
    border: 1px solid var(--border);
    box-shadow: var(--shadow-sm);
    transition: transform 0.4s var(--ease-smooth),
                box-shadow 0.4s var(--ease-smooth),
                background 0.4s var(--ease-smooth),
                border-color 0.4s var(--ease-smooth);
    position: relative;
    overflow: hidden;
}

.center-card::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 3px;
    background: var(--gradient-brand);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.4s var(--ease-smooth);
}

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

.center-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-lg);
    border-color: transparent;
    background: linear-gradient(135deg, #1366d6 0%, #0aaa8e 100%);
}

/* Card Header */
.center-card-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 1rem;
    margin-bottom: 1.25rem;
}

.center-card-header h3 {
    font-size: 1.1rem;
    font-weight: 800;
    color: var(--dark-2);
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
    transition: color 0.4s ease;
}

.center-card:hover .center-card-header h3 { color: white; }

/* Circle Arrow Button */
.btn-circle-arrow {
    width: 42px;
    height: 42px;
    min-width: 42px;
    background: var(--primary-light);
    color: var(--primary) !important;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    transition: var(--transition-bounce);
    font-size: 0.9rem;
}

.btn-circle-arrow:hover,
.center-card:hover .btn-circle-arrow {
    background: var(--white);
    color: var(--primary) !important;
    transform: scale(1.1) rotate(45deg);
    box-shadow: var(--shadow-md);
}

/* Card Body */
.center-card-body {
    flex-grow: 1;
    margin: 0.5rem 0 1.25rem;
}

.center-card-body p {
    font-size: var(--text-xs);
    font-weight: 700;
    color: var(--muted);
    text-transform: uppercase;
    letter-spacing: 0.06em;
    margin-bottom: 0.75rem;
    transition: color 0.4s ease;
}

.center-card:hover .center-card-body p { color: rgba(255,255,255,0.75); }

.center-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
}

.center-tag {
    background: var(--primary-light);
    border: 1px solid rgba(26, 115, 232, 0.12);
    color: var(--primary);
    padding: 0.3rem 0.85rem;
    border-radius: var(--radius-full);
    font-size: var(--text-xs);
    font-weight: 700;
    transition: var(--transition);
    white-space: nowrap;
}

.center-card:hover .center-tag {
    background: rgba(255, 255, 255, 0.18);
    border-color: rgba(255, 255, 255, 0.15);
    color: white;
}

/* Card Footer */
.center-card-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: 1.25rem;
    border-top: 1px solid var(--border);
    transition: border-color 0.4s ease;
}

.center-card:hover .center-card-footer { border-color: rgba(255,255,255,0.15); }

.footer-icon-circle {
    width: 52px;
    height: 52px;
    background: var(--primary-light);
    color: var(--primary);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.4rem;
    overflow: hidden;
    transition: var(--transition);
    flex-shrink: 0;
}

.footer-icon-circle img {
    max-width: 70%;
    max-height: 70%;
    object-fit: contain;
}

.center-card:hover .footer-icon-circle {
    background: white;
    color: var(--primary);
}

.center-info-block { text-align: right; }

.center-info-label {
    display: block;
    font-size: var(--text-xs);
    color: var(--muted);
    font-weight: 600;
    margin-bottom: 2px;
    transition: color 0.4s ease;
}

.center-info-value {
    display: block;
    font-size: var(--text-sm);
    font-weight: 800;
    color: var(--dark-2);
    transition: color 0.4s ease;
}

.center-card:hover .center-info-label { color: rgba(255,255,255,0.7); }
.center-card:hover .center-info-value { color: white; }

/* === 11. Portal Footer === */
.portal-footer {
    background: var(--gradient-footer);
    color: white;
    padding: clamp(4rem, 7vw, 6rem) 0 0;
    margin-top: auto;
    position: relative;
    overflow: hidden;
}

.portal-footer::before {
    content: '';
    position: absolute;
    width: 600px; height: 600px;
    background: radial-gradient(circle, rgba(26, 115, 232, 0.08) 0%, transparent 70%);
    top: -200px; right: -100px;
    border-radius: 50%;
    pointer-events: none;
}

.footer-top {
    display: flex;
    justify-content: space-between;
    gap: clamp(2rem, 5vw, 4rem);
    padding-bottom: clamp(2.5rem, 5vw, 4rem);
    flex-wrap: wrap;
}

.footer-col-about {
    flex: 1;
    min-width: 260px;
    max-width: 420px;
}

.footer-logo-text {
    display: block;
    font-size: clamp(1.2rem, 2vw, 1.6rem);
    font-weight: 900;
    text-transform: uppercase;
    letter-spacing: 0.02em;
    line-height: 1.3;
    background: var(--gradient-brand);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 1.25rem;
}

.footer-col-about p {
    color: rgba(255, 255, 255, 0.60);
    line-height: 1.80;
    font-size: var(--text-sm);
    margin-bottom: 2rem;
}

.footer-socials {
    display: flex;
    gap: 0.75rem;
}

.social-circle {
    width: 42px;
    height: 42px;
    background: rgba(255, 255, 255, 0.06);
    border: 1px solid rgba(255, 255, 255, 0.10);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: rgba(255,255,255,0.7);
    font-size: 1rem;
    text-decoration: none !important;
    transition: var(--transition-bounce);
}

.social-circle:hover {
    background: var(--primary);
    border-color: var(--primary);
    color: white;
    transform: translateY(-4px);
}

.footer-col-contact {
    flex: 1;
    min-width: 250px;
}

.footer-col-title {
    font-size: var(--text-base);
    font-weight: 700;
    color: white;
    margin-bottom: 1.75rem;
    letter-spacing: 0.02em;
}

.contact-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.contact-icon {
    width: 42px;
    height: 42px;
    background: rgba(255, 255, 255, 0.06);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: rgba(255, 255, 255, 0.65);
    font-size: 0.95rem;
    flex-shrink: 0;
    transition: var(--transition);
}

.contact-item:hover .contact-icon {
    background: var(--primary);
    color: white;
}

.contact-text {
    color: rgba(255, 255, 255, 0.72);
    font-size: var(--text-sm);
    font-weight: 500;
    line-height: 1.5;
}

/* Back to top button */
.back-to-top {
    position: absolute;
    top: -24px;
    left: 50%;
    transform: translateX(-50%);
    width: 48px;
    height: 48px;
    background: var(--gradient-brand);
    border: none;
    border-radius: 50%;
    color: white;
    font-size: 1.1rem;
    cursor: pointer;
    box-shadow: 0 10px 25px rgba(26, 115, 232, 0.35);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition-bounce);
}

.back-to-top:hover {
    transform: translateX(-50%) translateY(-4px) scale(1.1);
    box-shadow: 0 16px 35px rgba(26, 115, 232, 0.45);
}

.footer-middle {
    position: relative;
    padding: 2.5rem 0;
    border-top: 1px solid rgba(255, 255, 255, 0.06);
}

.footer-nav-container {
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 1rem;
}

.footer-nav-links {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem 1.5rem;
}

.footer-nav-links a {
    color: rgba(255,255,255,0.55);
    text-decoration: none;
    font-size: var(--text-sm);
    font-weight: 500;
    transition: color 0.3s ease;
}

.footer-nav-links a:hover { color: white; }

.footer-copyright-bar {
    border-top: 1px solid rgba(255, 255, 255, 0.06);
    padding: 1.5rem var(--container-px);
    max-width: var(--container-max);
    margin: 0 auto;
}

.copyright-text {
    color: rgba(255, 255, 255, 0.38);
    font-size: var(--text-xs);
    text-align: center;
}

/* === 12. Section Backgrounds === */
#centers {
    background: var(--surface);
}

/* === 13. Subpage Hero (university page) === */
.subpage-hero {
    padding: clamp(7rem, 14vw, 10rem) 0 clamp(3rem, 6vw, 5rem);
    background: var(--gradient-hero);
    color: white;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.subpage-hero::before {
    content: '';
    position: absolute;
    width: 500px; height: 500px;
    background: radial-gradient(circle, rgba(0, 201, 167, 0.18) 0%, transparent 70%);
    top: -150px; right: -100px;
    border-radius: 50%;
    pointer-events: none;
}

.subpage-hero h1 {
    font-size: clamp(2rem, 4.5vw, 3.25rem);
    font-weight: 900;
    letter-spacing: -0.02em;
    margin-bottom: 1rem;
    position: relative; z-index: 1;
}

.subpage-hero p {
    font-size: clamp(1rem, 1.5vw, 1.15rem);
    opacity: 0.88;
    max-width: 60ch;
    margin: 0 auto;
    line-height: 1.75;
    position: relative; z-index: 1;
}

/* === 14. Filter Tabs (university page) === */
.filter-tabs-container {
    background: white;
    padding: 1rem 0;
    position: sticky;
    top: 68px;
    z-index: 200;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
    border-bottom: 1px solid var(--border);
}

.filter-tabs {
    display: flex;
    justify-content: center;
    gap: 0.5rem;
    flex-wrap: wrap;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--container-px);
}

.filter-tab {
    padding: 0.55rem 1.4rem;
    border-radius: var(--radius-full);
    background: var(--surface);
    color: var(--body-text);
    font-weight: 600;
    font-size: var(--text-sm);
    cursor: pointer;
    transition: var(--transition);
    border: 2px solid transparent;
    white-space: nowrap;
    user-select: none;
}

.filter-tab:hover {
    background: var(--primary-light);
    color: var(--primary);
    transform: translateY(-2px);
}

.filter-tab.active {
    background: var(--primary);
    color: white;
    box-shadow: var(--shadow-primary);
}

/* === 15. University Grid Page === */
.university-grid-section {
    padding: clamp(3rem, 6vw, 5rem) 0 clamp(4rem, 8vw, 7rem);
    background: var(--surface);
    min-height: 500px;
}

.center-card.hidden {
    display: none !important;
}

/* === 16. Animations === */
.animate-fade-in {
    opacity: 0;
    animation: fadeInUp 0.7s var(--ease-smooth) forwards;
}

@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(24px); }
    to   { opacity: 1; transform: translateY(0); }
}

/* === 17. Responsive === */
@media (max-width: 1200px) {
    .hero-content { gap: 3rem; }
}

@media (max-width: 1024px) {
    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .text-col > p { margin: 0 auto; }

    .hero-stats {
        max-width: 440px;
        margin: 0 auto;
    }

    .hero-visual {
        order: -1;
        max-width: 420px;
        margin: 0 auto;
    }

    .features-slider { max-width: 100%; }

    .footer-col-contact { text-align: left !important; }
}

@media (max-width: 768px) {
    .nav-menu {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: rgba(15, 22, 35, 0.97);
        backdrop-filter: blur(20px);
        flex-direction: column;
        align-items: stretch;
        padding: 1.5rem;
        gap: 0.75rem;
        border-bottom-left-radius: var(--radius-md);
        border-bottom-right-radius: var(--radius-md);
        box-shadow: var(--shadow-xl);
    }

    .nav-menu.open { display: flex; }

    .landing-header.scrolled .nav-menu {
        background: rgba(255, 255, 255, 0.98);
    }

    .nav-link {
        color: rgba(255,255,255,0.9);
        padding: 0.75rem 1rem;
        border-radius: var(--radius-sm);
        font-size: var(--text-base);
    }

    .landing-header.scrolled .nav-link { color: var(--dark-3); }

    .btn-login {
        margin-left: 0;
        width: 100%;
        justify-content: center;
    }

    .nav-burger { display: flex; }

    .hero-wrapper { padding-top: 80px; padding-bottom: 60px; }

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

    .footer-top { flex-direction: column; }

    .footer-nav-container { flex-direction: column; gap: 0.5rem; }

    .filter-tabs {
        justify-content: flex-start;
        flex-wrap: nowrap;
        overflow-x: auto;
        padding-bottom: 0.5rem;
        scrollbar-width: none;
        -ms-overflow-style: none;
    }

    .filter-tabs::-webkit-scrollbar { display: none; }
}

@media (max-width: 480px) {
    .hero-stats { grid-template-columns: 1fr 1fr; gap: 0.75rem; }
    .logo-text { display: none; }
    .grid { grid-template-columns: 1fr; }
}