/* ===========================
   CSS CUSTOM PROPERTIES
   =========================== */
:root {
    /* Color Palette */
    --color-primary: #2563EB;
    --color-primary-light: #60A5FA;
    --color-secondary: #7C3AED;
    --color-secondary-light: #A78BFA;
    --color-cyan: #06B6D4;
    --color-cyan-light: #67E8F9;
    --color-indigo: #4F46E5;
    --color-indigo-light: #818CF8;
    --color-sky: #0EA5E9;
    --color-sky-light: #7DD3FC;

    /* Neutrals */
    --color-white: #FFFFFF;
    --color-bg: #F0F4FF;
    --color-bg-alt: #E8EEFF;
    --color-text: #1E293B;
    --color-text-secondary: #475569;
    --color-text-muted: #94A3B8;

    /* Glass */
    --glass-bg: rgba(255, 255, 255, 0.55);
    --glass-bg-strong: rgba(255, 255, 255, 0.70);
    --glass-border: rgba(255, 255, 255, 0.50);
    --glass-shadow: 0 8px 32px rgba(31, 38, 135, 0.08);

    /* Spacing */
    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 1.5rem;
    --space-lg: 2rem;
    --space-xl: 3rem;
    --space-2xl: 5rem;
    --space-3xl: 7rem;

    /* Typography */
    --font-family: 'Prompt', sans-serif;
    --font-size-base: 1rem;
    --font-size-sm: 0.875rem;
    --font-size-xs: 0.75rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.5rem;
    --font-size-2xl: 2rem;
    --font-size-3xl: 2.75rem;
    --font-size-4xl: 3.5rem;

    /* Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;

    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;

    /* Navbar height */
    --navbar-height: 80px;
}

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: var(--navbar-height);
}

body {
    font-family: var(--font-family);
    font-weight: 400;
    font-size: var(--font-size-base);
    line-height: 1.7;
    color: var(--color-text);
    background-color: var(--color-bg);
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

a {
    text-decoration: none;
    color: inherit;
}

ul {
    list-style: none;
}

img {
    max-width: 100%;
    height: auto;
}

/* ===========================
   NAVBAR
   =========================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--navbar-height);
    z-index: 1000;
    transition: background var(--transition-base), box-shadow var(--transition-base), backdrop-filter var(--transition-base);
    background: transparent;
}

.navbar.scrolled {
    background: rgba(255, 255, 255, 0.65);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    box-shadow: 0 1px 20px rgba(31, 38, 135, 0.07);
    border-bottom: 1px solid rgba(255, 255, 255, 0.4);
}

.nav-container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 var(--space-lg);
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    flex-shrink: 0;
}

.nav-logo {
    width: 46px;
    height: 46px;
    border-radius: var(--radius-md);
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-white);
    flex-shrink: 0;
}

.nav-logo svg {
    width: 24px;
    height: 24px;
}

.nav-brand-text {
    display: flex;
    flex-direction: column;
}

.nav-brand-name {
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--color-text);
    line-height: 1.3;
}

.nav-brand-university {
    font-size: var(--font-size-xs);
    font-weight: 400;
    color: var(--color-text-secondary);
    line-height: 1.3;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
}

.nav-link {
    padding: 0.5rem 1rem;
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-text-secondary);
    border-radius: var(--radius-sm);
    transition: color var(--transition-fast), background var(--transition-fast);
    position: relative;
}

.nav-link:hover,
.nav-link.active {
    color: var(--color-primary);
    background: rgba(37, 99, 235, 0.06);
}

/* Hamburger */
.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: 8px;
    background: none;
    border: none;
    cursor: pointer;
    z-index: 1001;
}

.hamburger-line {
    width: 24px;
    height: 2.5px;
    background: var(--color-text);
    border-radius: 4px;
    transition: transform var(--transition-base), opacity var(--transition-base);
}

.hamburger.active .hamburger-line:nth-child(1) {
    transform: translateY(7.5px) rotate(45deg);
}

.hamburger.active .hamburger-line:nth-child(2) {
    opacity: 0;
}

.hamburger.active .hamburger-line:nth-child(3) {
    transform: translateY(-7.5px) rotate(-45deg);
}

/* ===========================
   HERO SECTION
   =========================== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    padding: calc(var(--navbar-height) + var(--space-xl)) var(--space-lg) var(--space-xl);
}

/* Aurora Background */
.aurora-bg {
    position: absolute;
    inset: 0;
    overflow: hidden;
    z-index: 0;
    background: linear-gradient(135deg, #EEF2FF 0%, #E0E7FF 30%, #F0F9FF 60%, #F5F3FF 100%);
}

.aurora-blob {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.5;
    animation: auroraFloat 12s ease-in-out infinite;
}

.aurora-blob-1 {
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(96, 165, 250, 0.5), transparent 70%);
    top: -10%;
    left: -5%;
    animation-duration: 14s;
}

.aurora-blob-2 {
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(124, 58, 237, 0.4), transparent 70%);
    top: 20%;
    right: -10%;
    animation-duration: 18s;
    animation-delay: -4s;
}

.aurora-blob-3 {
    width: 550px;
    height: 550px;
    background: radial-gradient(circle, rgba(6, 182, 212, 0.35), transparent 70%);
    bottom: -5%;
    left: 20%;
    animation-duration: 16s;
    animation-delay: -8s;
}

.aurora-blob-4 {
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(79, 70, 229, 0.35), transparent 70%);
    top: 40%;
    left: 50%;
    animation-duration: 20s;
    animation-delay: -2s;
}

.aurora-blob-5 {
    width: 450px;
    height: 450px;
    background: radial-gradient(circle, rgba(14, 165, 233, 0.3), transparent 70%);
    bottom: 10%;
    right: 15%;
    animation-duration: 15s;
    animation-delay: -6s;
}

@keyframes auroraFloat {
    0%, 100% {
        transform: translate(0, 0) scale(1);
    }
    25% {
        transform: translate(30px, -20px) scale(1.05);
    }
    50% {
        transform: translate(-20px, 15px) scale(0.95);
    }
    75% {
        transform: translate(15px, 25px) scale(1.03);
    }
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    max-width: 780px;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
    padding: 0.4rem 1.2rem;
    background: rgba(255, 255, 255, 0.6);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid rgba(255, 255, 255, 0.5);
    border-radius: 50px;
    font-size: var(--font-size-xs);
    font-weight: 500;
    color: var(--color-primary);
    letter-spacing: 1.5px;
    margin-bottom: var(--space-lg);
}

.badge-icon {
    width: 14px;
    height: 14px;
}

.hero-title {
    font-size: var(--font-size-4xl);
    font-weight: 700;
    line-height: 1.3;
    color: var(--color-text);
    margin-bottom: var(--space-md);
    background: linear-gradient(135deg, var(--color-text) 0%, var(--color-indigo) 50%, var(--color-primary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: var(--font-size-lg);
    font-weight: 400;
    color: var(--color-text-secondary);
    line-height: 1.8;
    margin-bottom: var(--space-xl);
}

.hero-cta {
    display: flex;
    gap: var(--space-sm);
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: var(--space-xl);
}

.hero-tagline {
    font-size: var(--font-size-xs);
    font-weight: 400;
    color: var(--color-text-muted);
    letter-spacing: 2px;
    text-transform: uppercase;
}

/* Scroll Indicator */
.scroll-indicator {
    position: absolute;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    z-index: 1;
    animation: scrollBounce 2s ease-in-out infinite;
    color: var(--color-text-muted);
}

.scroll-indicator svg {
    width: 24px;
    height: 24px;
}

@keyframes scrollBounce {
    0%, 100% { transform: translateX(-50%) translateY(0); }
    50% { transform: translateX(-50%) translateY(8px); }
}

/* ===========================
   BUTTONS
   =========================== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.85rem 1.8rem;
    font-family: var(--font-family);
    font-size: var(--font-size-sm);
    font-weight: 500;
    border-radius: var(--radius-lg);
    cursor: pointer;
    border: none;
    transition: transform var(--transition-fast), box-shadow var(--transition-base), background var(--transition-base);
    text-decoration: none;
}

.btn svg {
    width: 18px;
    height: 18px;
}

.btn-primary {
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    color: var(--color-white);
    box-shadow: 0 4px 15px rgba(37, 99, 235, 0.25);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(37, 99, 235, 0.35);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.65);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    color: var(--color-text);
    border: 1px solid rgba(255, 255, 255, 0.5);
    box-shadow: var(--glass-shadow);
}

.btn-secondary:hover {
    transform: translateY(-2px);
    background: rgba(255, 255, 255, 0.85);
    box-shadow: 0 8px 25px rgba(31, 38, 135, 0.12);
}

.btn-card {
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    color: var(--color-white);
    padding: 0.7rem 1.4rem;
    font-size: var(--font-size-sm);
    border-radius: var(--radius-md);
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.2);
}

.btn-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(37, 99, 235, 0.3);
}

.btn-card svg {
    width: 16px;
    height: 16px;
    transition: transform var(--transition-fast);
}

.btn-card:hover svg {
    transform: translateX(3px);
}

/* ===========================
   SECTIONS (COMMON)
   =========================== */
.section {
    position: relative;
    padding: var(--space-3xl) var(--space-lg);
    overflow: hidden;
}

.section-container {
    max-width: 1080px;
    margin: 0 auto;
    position: relative;
    z-index: 1;
}

.section-header {
    text-align: center;
    margin-bottom: var(--space-2xl);
}

.section-subtitle-top {
    display: inline-block;
    font-size: var(--font-size-xs);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 2.5px;
    color: var(--color-primary);
    margin-bottom: var(--space-xs);
}

.section-title {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: var(--space-sm);
    line-height: 1.3;
}

.section-description {
    font-size: var(--font-size-base);
    font-weight: 400;
    color: var(--color-text-secondary);
    max-width: 600px;
    margin: 0 auto;
    line-height: 1.8;
}

/* ===========================
   STUDENT SERVICES SECTION
   =========================== */
.section-student {
    background: linear-gradient(180deg, var(--color-bg) 0%, #E8EEFF 100%);
}

/* ===========================
   STAFF SERVICES SECTION
   =========================== */
.section-staff {
    background: linear-gradient(180deg, #E8EEFF 0%, #EDE9FE 50%, #E0E7FF 100%);
}

.section-bg-accent {
    position: absolute;
    top: -100px;
    right: -150px;
    width: 500px;
    height: 500px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(124, 58, 237, 0.08), transparent 70%);
    filter: blur(60px);
    z-index: 0;
}

/* ===========================
   SERVICE CARDS
   =========================== */
.cards-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-lg);
}

.service-card {
    background: var(--glass-bg-strong);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-xl);
    padding: var(--space-xl);
    box-shadow: var(--glass-shadow);
    transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-sm);
}

.service-card:hover {
    transform: translateY(-6px);
    box-shadow: 0 16px 48px rgba(31, 38, 135, 0.12), 0 0 0 1px rgba(96, 165, 250, 0.2);
    border-color: rgba(96, 165, 250, 0.35);
}

.card-icon {
    position: relative;
    width: 60px;
    height: 60px;
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--space-xs);
    transition: transform var(--transition-base);
}

.service-card:hover .card-icon {
    transform: translateY(-3px) scale(1.05);
}

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

.card-icon-secondary {
    position: absolute;
    bottom: -4px;
    right: -4px;
    width: 18px !important;
    height: 18px !important;
    padding: 2px;
    background: var(--color-white);
    border-radius: 50%;
}

.card-icon-blue {
    background: linear-gradient(135deg, rgba(96, 165, 250, 0.2), rgba(37, 99, 235, 0.15));
    color: var(--color-primary);
}

.card-icon-purple {
    background: linear-gradient(135deg, rgba(167, 139, 250, 0.2), rgba(124, 58, 237, 0.15));
    color: var(--color-secondary);
}

.card-icon-indigo {
    background: linear-gradient(135deg, rgba(129, 140, 248, 0.2), rgba(79, 70, 229, 0.15));
    color: var(--color-indigo);
}

.card-icon-cyan {
    background: linear-gradient(135deg, rgba(103, 232, 249, 0.2), rgba(6, 182, 212, 0.15));
    color: var(--color-cyan);
}

.card-title {
    font-size: var(--font-size-xl);
    font-weight: 600;
    color: var(--color-text);
    line-height: 1.4;
}

.card-description {
    font-size: var(--font-size-sm);
    font-weight: 400;
    color: var(--color-text-secondary);
    line-height: 1.8;
    flex-grow: 1;
}

/* ===========================
   CONTACT SECTION
   =========================== */
.section-contact {
    background: linear-gradient(180deg, #E0E7FF 0%, #EEF2FF 50%, var(--color-bg) 100%);
}

.contact-card {
    background: var(--glass-bg-strong);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-xl);
    padding: var(--space-2xl);
    box-shadow: var(--glass-shadow);
    max-width: 750px;
    margin: 0 auto;
}

.contact-card-header {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    margin-bottom: var(--space-xl);
    padding-bottom: var(--space-lg);
    border-bottom: 1px solid rgba(148, 163, 184, 0.15);
}

.contact-card-icon {
    width: 56px;
    height: 56px;
    border-radius: var(--radius-lg);
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-white);
    flex-shrink: 0;
}

.contact-card-icon svg {
    width: 28px;
    height: 28px;
}

.contact-card-title {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--color-text);
    line-height: 1.4;
}

.contact-card-subtitle {
    font-size: var(--font-size-sm);
    font-weight: 400;
    color: var(--color-text-secondary);
}

.contact-info-grid {
    display: flex;
    flex-direction: column;
    gap: var(--space-lg);
    margin-bottom: var(--space-xl);
}

.contact-info-item {
    display: flex;
    align-items: flex-start;
    gap: var(--space-md);
}

.contact-info-icon {
    width: 44px;
    height: 44px;
    border-radius: var(--radius-md);
    background: rgba(37, 99, 235, 0.08);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-primary);
    flex-shrink: 0;
}

.contact-info-icon svg {
    width: 20px;
    height: 20px;
}

.contact-info-label {
    display: block;
    font-size: var(--font-size-xs);
    font-weight: 600;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 2px;
}

.contact-info-value {
    display: block;
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-text);
    line-height: 1.6;
}

.contact-buttons {
    display: flex;
    gap: var(--space-sm);
    flex-wrap: wrap;
}

/* ===========================
   FOOTER
   =========================== */
.footer {
    background: linear-gradient(180deg, var(--color-bg) 0%, #E0E7FF 100%);
    padding: var(--space-2xl) var(--space-lg) var(--space-xl);
    text-align: center;
}

.footer-container {
    max-width: 1080px;
    margin: 0 auto;
}

.footer-brand {
    margin-bottom: var(--space-lg);
}

.footer-logo {
    width: 50px;
    height: 50px;
    border-radius: var(--radius-md);
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    display: inline-flex;
    align-items: center;
    justify-content: center;
    color: var(--color-white);
    margin-bottom: var(--space-sm);
}

.footer-logo svg {
    width: 26px;
    height: 26px;
}

.footer-name {
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: 2px;
}

.footer-university {
    font-size: var(--font-size-sm);
    font-weight: 400;
    color: var(--color-text-secondary);
    margin-bottom: var(--space-xs);
}

.footer-english {
    font-size: var(--font-size-xs);
    font-weight: 400;
    color: var(--color-text-muted);
    letter-spacing: 1px;
}

.footer-divider {
    width: 60px;
    height: 2px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-secondary));
    margin: 0 auto var(--space-lg);
    border-radius: 2px;
}

.footer-copyright {
    font-size: var(--font-size-xs);
    font-weight: 400;
    color: var(--color-text-muted);
}

/* ===========================
   SCROLL REVEAL ANIMATION
   =========================== */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.7s ease, transform 0.7s ease;
}

.reveal.revealed {
    opacity: 1;
    transform: translateY(0);
}

/* ===========================
   RESPONSIVE DESIGN
   =========================== */

/* Tablet */
@media (max-width: 1024px) {
    :root {
        --font-size-4xl: 2.75rem;
        --font-size-3xl: 2.25rem;
    }

    .nav-brand-name {
        font-size: var(--font-size-xs);
    }
}

/* Mobile */
@media (max-width: 768px) {
    :root {
        --font-size-4xl: 2rem;
        --font-size-3xl: 1.75rem;
        --font-size-2xl: 1.5rem;
        --font-size-xl: 1.25rem;
        --navbar-height: 70px;
    }

    /* Mobile Navbar */
    .nav-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 75%;
        max-width: 320px;
        height: 100vh;
        background: rgba(255, 255, 255, 0.92);
        backdrop-filter: blur(24px);
        -webkit-backdrop-filter: blur(24px);
        flex-direction: column;
        align-items: stretch;
        padding: calc(var(--navbar-height) + var(--space-lg)) var(--space-lg) var(--space-lg);
        gap: var(--space-xs);
        transition: right var(--transition-base);
        box-shadow: -4px 0 30px rgba(31, 38, 135, 0.1);
    }

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

    .nav-link {
        padding: 0.8rem 1rem;
        font-size: var(--font-size-base);
        border-radius: var(--radius-md);
    }

    .hamburger {
        display: flex;
    }

    /* Mobile Overlay */
    .nav-overlay {
        position: fixed;
        inset: 0;
        background: rgba(0, 0, 0, 0.3);
        z-index: 999;
        opacity: 0;
        visibility: hidden;
        transition: opacity var(--transition-base), visibility var(--transition-base);
    }

    .nav-overlay.active {
        opacity: 1;
        visibility: visible;
    }

    .nav-brand-text {
        max-width: 200px;
    }

    .nav-brand-name {
        font-size: 0.7rem;
        line-height: 1.25;
    }

    .nav-brand-university {
        font-size: 0.65rem;
    }

    /* Hero Mobile */
    .hero {
        padding: calc(var(--navbar-height) + var(--space-lg)) var(--space-sm) var(--space-xl);
    }

    .hero-title {
        font-size: var(--font-size-2xl);
    }

    .hero-subtitle {
        font-size: var(--font-size-sm);
    }

    .hero-subtitle br {
        display: none;
    }

    .hero-cta {
        flex-direction: column;
        align-items: center;
    }

    .btn {
        width: 100%;
        max-width: 280px;
        justify-content: center;
    }

    /* Cards Mobile */
    .cards-grid {
        grid-template-columns: 1fr;
    }

    .section {
        padding: var(--space-2xl) var(--space-sm);
    }

    .section-description br {
        display: none;
    }

    .service-card {
        padding: var(--space-lg);
    }

    /* Contact Mobile */
    .contact-card {
        padding: var(--space-lg);
    }

    .contact-card-header {
        flex-direction: column;
        text-align: center;
    }

    .contact-buttons {
        flex-direction: column;
    }

    .contact-buttons .btn {
        max-width: 100%;
    }

    /* Aurora blob sizing */
    .aurora-blob-1 { width: 350px; height: 350px; }
    .aurora-blob-2 { width: 300px; height: 300px; }
    .aurora-blob-3 { width: 320px; height: 320px; }
    .aurora-blob-4 { width: 250px; height: 250px; }
    .aurora-blob-5 { width: 280px; height: 280px; }
}

/* Small Mobile */
@media (max-width: 400px) {
    :root {
        --font-size-4xl: 1.75rem;
        --font-size-3xl: 1.5rem;
    }

    .hero-badge {
        font-size: 0.65rem;
        padding: 0.3rem 0.8rem;
    }

    .card-title {
        font-size: var(--font-size-lg);
    }
}