/* ═══════════════════════════════════════════════════════════════════════════
   IITECH — Site Vitrine Premium
   ═══════════════════════════════════════════════════════════════════════════ */

/* ── Reset & Variables ─────────────────────────────────────────────────── */
:root {
    --color-bg-deep: #0a0618;
    --color-bg-section: #0f0a2e;
    --color-bg-card: #170f3d;
    --color-bg-card-hover: #1e1450;
    --color-accent: #c8956c;
    --color-accent-light: #e0b58f;
    --color-accent-glow: rgba(200, 149, 108, 0.15);
    --color-text: #e8e4f0;
    --color-text-muted: #a09bb5;
    --color-text-heading: #ffffff;
    --color-border: rgba(255, 255, 255, 0.08);
    --color-gradient-start: #1a0f3c;
    --color-gradient-end: #0d0825;
    --font-body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-heading: 'Playfair Display', Georgia, serif;
    --max-width: 1200px;
    --section-padding: 100px 0;
    --border-radius: 16px;
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

body {
    font-family: var(--font-body);
    background: var(--color-bg-deep);
    color: var(--color-text);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
}

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

a:hover {
    color: var(--color-accent-light);
}

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

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

/* ── Section base ──────────────────────────────────────────────────────── */
.section {
    padding: var(--section-padding);
    position: relative;
}

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

.section__label {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 3px;
    text-transform: uppercase;
    color: var(--color-accent);
    margin-bottom: 16px;
}

.section__title {
    font-family: var(--font-heading);
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 600;
    color: var(--color-text-heading);
    margin-bottom: 20px;
    line-height: 1.2;
}

.section__subtitle {
    font-size: 1.125rem;
    color: var(--color-text-muted);
    max-width: 700px;
    line-height: 1.8;
}

.section__subtitle--center {
    margin: 0 auto;
    text-align: center;
}

.section__header {
    text-align: center;
    margin-bottom: 64px;
}

/* ── Animations (fade in on scroll) ────────────────────────────────────── */
.reveal {
    opacity: 0;
    transform: translateY(40px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

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

.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }
.reveal-delay-4 { transition-delay: 0.4s; }

/* ── Header / Navigation ──────────────────────────────────────────────── */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 16px 0;
    transition: background var(--transition), box-shadow var(--transition), padding var(--transition);
}

.header.scrolled {
    background: rgba(10, 6, 24, 0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    box-shadow: 0 2px 40px rgba(0, 0, 0, 0.3);
    padding: 10px 0;
}

.header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.header__logo {
    font-family: var(--font-heading);
    font-size: 1.6rem;
    font-weight: 700;
    color: var(--color-text-heading);
    letter-spacing: 2px;
}

.header__logo span {
    color: var(--color-accent);
}

.nav__list {
    display: flex;
    list-style: none;
    gap: 32px;
}

.nav__link {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-text-muted);
    transition: color var(--transition);
    position: relative;
}

.nav__link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--color-accent);
    transition: width var(--transition);
}

.nav__link:hover,
.nav__link.active {
    color: var(--color-text-heading);
}

.nav__link:hover::after,
.nav__link.active::after {
    width: 100%;
}

/* Burger menu */
.burger {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    background: none;
    border: none;
    padding: 8px;
}

.burger span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--color-text);
    transition: transform var(--transition), opacity var(--transition);
}

.burger.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.burger.active span:nth-child(2) {
    opacity: 0;
}

.burger.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* ── Hero ──────────────────────────────────────────────────────────────── */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    position: relative;
    overflow: hidden;
    background: radial-gradient(ellipse at 50% 30%, #1e1060 0%, var(--color-bg-deep) 70%);
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle at 30% 40%, rgba(200, 149, 108, 0.04) 0%, transparent 50%),
                radial-gradient(circle at 70% 60%, rgba(100, 80, 200, 0.06) 0%, transparent 50%);
    animation: heroFloat 20s ease-in-out infinite;
}

@keyframes heroFloat {
    0%, 100% { transform: translate(0, 0) rotate(0deg); }
    33% { transform: translate(2%, -1%) rotate(1deg); }
    66% { transform: translate(-1%, 2%) rotate(-1deg); }
}

.hero__content {
    position: relative;
    z-index: 1;
    max-width: 800px;
    padding: 0 24px;
}

.hero__badge {
    display: inline-block;
    padding: 8px 20px;
    background: var(--color-accent-glow);
    border: 1px solid rgba(200, 149, 108, 0.3);
    border-radius: 50px;
    font-size: 0.8rem;
    font-weight: 600;
    letter-spacing: 2px;
    text-transform: uppercase;
    color: var(--color-accent);
    margin-bottom: 32px;
}

.hero__title {
    font-family: var(--font-heading);
    font-size: clamp(2.5rem, 6vw, 4rem);
    font-weight: 700;
    color: var(--color-text-heading);
    line-height: 1.15;
    margin-bottom: 24px;
}

.hero__title em {
    font-style: normal;
    background: linear-gradient(135deg, var(--color-accent), var(--color-accent-light));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero__subtitle {
    font-size: 1.2rem;
    color: var(--color-text-muted);
    line-height: 1.8;
    margin-bottom: 48px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.hero__cta {
    display: inline-flex;
    gap: 16px;
    flex-wrap: wrap;
    justify-content: center;
}

/* ── Buttons ───────────────────────────────────────────────────────────── */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 32px;
    font-size: 0.95rem;
    font-weight: 600;
    border-radius: 50px;
    cursor: pointer;
    border: none;
    transition: all var(--transition);
    font-family: var(--font-body);
}

.btn--primary {
    background: linear-gradient(135deg, var(--color-accent), #b07a52);
    color: #0a0618;
    box-shadow: 0 4px 20px rgba(200, 149, 108, 0.3);
}

.btn--primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(200, 149, 108, 0.4);
    color: #0a0618;
}

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

.btn--outline:hover {
    border-color: var(--color-accent);
    color: var(--color-accent);
    transform: translateY(-2px);
}

/* ── Cards grid ────────────────────────────────────────────────────────── */
.cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 24px;
}

.card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    padding: 40px 32px;
    transition: all var(--transition);
}

.card:hover {
    background: var(--color-bg-card-hover);
    border-color: rgba(200, 149, 108, 0.2);
    transform: translateY(-4px);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
}

.card__icon {
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-accent-glow);
    border-radius: 14px;
    margin-bottom: 24px;
    font-size: 1.5rem;
}

.card__title {
    font-family: var(--font-heading);
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--color-text-heading);
    margin-bottom: 12px;
}

.card__text {
    font-size: 0.95rem;
    color: var(--color-text-muted);
    line-height: 1.7;
}

/* ── Two-column layout ─────────────────────────────────────────────────── */
.split {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 64px;
    align-items: center;
}

.split__visual {
    aspect-ratio: 4/3;
    background: linear-gradient(135deg, var(--color-bg-card), var(--color-bg-card-hover));
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    position: relative;
}

.split__visual::after {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at 30% 40%, rgba(200, 149, 108, 0.08) 0%, transparent 60%);
}

.split__visual-text {
    font-family: var(--font-heading);
    font-size: 1.2rem;
    color: var(--color-text-muted);
    text-align: center;
    padding: 24px;
    position: relative;
    z-index: 1;
}

/* ── Values list ───────────────────────────────────────────────────────── */
.values-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 20px;
    margin-top: 32px;
}

.values-list li {
    display: flex;
    align-items: flex-start;
    gap: 16px;
    font-size: 1rem;
    line-height: 1.6;
}

.values-list__icon {
    flex-shrink: 0;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-accent-glow);
    border-radius: 8px;
    font-size: 0.9rem;
    margin-top: 2px;
}

/* ── Stats bar ─────────────────────────────────────────────────────────── */
.stats {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 32px;
    padding: 60px 0;
    border-top: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
    margin: 80px 0;
}

.stat {
    text-align: center;
}

.stat__number {
    font-family: var(--font-heading);
    font-size: clamp(2rem, 4vw, 2.8rem);
    font-weight: 700;
    color: var(--color-accent);
    margin-bottom: 8px;
}

.stat__label {
    font-size: 0.875rem;
    color: var(--color-text-muted);
    font-weight: 500;
}

/* ── Timeline ──────────────────────────────────────────────────────────── */
.timeline {
    position: relative;
    max-width: 700px;
    margin: 0 auto;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 20px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(to bottom, var(--color-accent), transparent);
}

.timeline__item {
    padding-left: 56px;
    margin-bottom: 40px;
    position: relative;
}

.timeline__item::before {
    content: '';
    position: absolute;
    left: 13px;
    top: 6px;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--color-accent);
    box-shadow: 0 0 20px rgba(200, 149, 108, 0.4);
}

.timeline__year {
    font-size: 0.8rem;
    font-weight: 700;
    color: var(--color-accent);
    letter-spacing: 2px;
    text-transform: uppercase;
    margin-bottom: 8px;
}

.timeline__title {
    font-family: var(--font-heading);
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--color-text-heading);
    margin-bottom: 8px;
}

.timeline__text {
    font-size: 0.95rem;
    color: var(--color-text-muted);
    line-height: 1.7;
}

/* ── FAQ Accordion ─────────────────────────────────────────────────────── */
.faq-list {
    max-width: 800px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.faq-item {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: 12px;
    overflow: hidden;
    transition: border-color var(--transition);
}

.faq-item.active {
    border-color: rgba(200, 149, 108, 0.3);
}

.faq-question {
    width: 100%;
    background: none;
    border: none;
    padding: 24px 28px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    cursor: pointer;
    font-family: var(--font-body);
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--color-text-heading);
    text-align: left;
    gap: 16px;
}

.faq-question:hover {
    color: var(--color-accent);
}

.faq-question__icon {
    flex-shrink: 0;
    width: 28px;
    height: 28px;
    border-radius: 50%;
    border: 2px solid var(--color-border);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition);
    font-size: 1rem;
    color: var(--color-text-muted);
}

.faq-item.active .faq-question__icon {
    transform: rotate(45deg);
    border-color: var(--color-accent);
    color: var(--color-accent);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease, padding 0.4s ease;
}

.faq-answer__inner {
    padding: 0 28px 24px;
    font-size: 0.95rem;
    color: var(--color-text-muted);
    line-height: 1.8;
}

/* ── Contact form ──────────────────────────────────────────────────────── */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 64px;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--color-text-muted);
    margin-bottom: 8px;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 14px 18px;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: 10px;
    color: var(--color-text);
    font-family: var(--font-body);
    font-size: 0.95rem;
    transition: border-color var(--transition);
    outline: none;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    border-color: var(--color-accent);
}

.form-group textarea {
    resize: vertical;
    min-height: 140px;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 32px;
}

.contact-info__item {
    display: flex;
    gap: 16px;
    align-items: flex-start;
}

.contact-info__icon {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-accent-glow);
    border-radius: 12px;
    font-size: 1.2rem;
    flex-shrink: 0;
}

.contact-info__label {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 4px;
}

.contact-info__value {
    font-size: 1rem;
    color: var(--color-text-heading);
}

/* ── Footer ────────────────────────────────────────────────────────────── */
.footer {
    background: var(--color-bg-deep);
    border-top: 1px solid var(--color-border);
    padding: 60px 0 32px;
}

.footer__top {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 48px;
    margin-bottom: 48px;
}

.footer__brand {
    font-family: var(--font-heading);
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--color-text-heading);
    margin-bottom: 16px;
    letter-spacing: 2px;
}

.footer__brand span {
    color: var(--color-accent);
}

.footer__desc {
    font-size: 0.9rem;
    color: var(--color-text-muted);
    line-height: 1.7;
    max-width: 400px;
}

.footer__heading {
    font-size: 0.8rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 2px;
    color: var(--color-text-heading);
    margin-bottom: 20px;
}

.footer__links {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.footer__links a {
    font-size: 0.9rem;
    color: var(--color-text-muted);
}

.footer__links a:hover {
    color: var(--color-accent);
}

.footer__bottom {
    border-top: 1px solid var(--color-border);
    padding-top: 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.8rem;
    color: var(--color-text-muted);
}

.footer__member {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 6px 14px;
    background: var(--color-accent-glow);
    border-radius: 50px;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--color-accent);
}

/* ── Divider / Separator ───────────────────────────────────────────────── */
.divider {
    width: 60px;
    height: 3px;
    background: linear-gradient(to right, var(--color-accent), transparent);
    margin-bottom: 24px;
}

.divider--center {
    margin-left: auto;
    margin-right: auto;
}

/* ── Feature highlight row ─────────────────────────────────────────────── */
.features-row {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
    margin-top: 48px;
}

.feature-highlight {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    padding: 32px 28px;
    display: flex;
    gap: 20px;
    align-items: flex-start;
    transition: all var(--transition);
}

.feature-highlight:hover {
    border-color: rgba(200, 149, 108, 0.2);
    transform: translateY(-2px);
}

.feature-highlight__icon {
    flex-shrink: 0;
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-accent-glow);
    border-radius: 10px;
    font-size: 1.2rem;
}

.feature-highlight__title {
    font-weight: 600;
    color: var(--color-text-heading);
    margin-bottom: 6px;
    font-size: 1rem;
}

.feature-highlight__text {
    font-size: 0.9rem;
    color: var(--color-text-muted);
    line-height: 1.6;
}

/* ═══════════════════════════════════════════════════════════════════════════
   RESPONSIVE
   ═══════════════════════════════════════════════════════════════════════════ */

@media (max-width: 1024px) {
    .split {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .split__visual {
        max-height: 300px;
    }

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

    .features-row {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    :root {
        --section-padding: 64px 0;
    }

    .nav {
        position: fixed;
        top: 0;
        right: -100%;
        width: 80%;
        max-width: 320px;
        height: 100vh;
        background: rgba(10, 6, 24, 0.98);
        backdrop-filter: blur(20px);
        -webkit-backdrop-filter: blur(20px);
        padding: 80px 32px 32px;
        transition: right var(--transition);
        z-index: 999;
    }

    .nav.open {
        right: 0;
    }

    .nav__list {
        flex-direction: column;
        gap: 24px;
    }

    .nav__link {
        font-size: 1.1rem;
    }

    .burger {
        display: flex;
        z-index: 1001;
    }

    .nav-overlay {
        display: none;
        position: fixed;
        inset: 0;
        background: rgba(0, 0, 0, 0.5);
        z-index: 998;
    }

    .nav-overlay.active {
        display: block;
    }

    .stats {
        grid-template-columns: repeat(2, 1fr);
        gap: 24px;
    }

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

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

    .footer__bottom {
        flex-direction: column;
        gap: 12px;
        text-align: center;
    }

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

    .hero__title {
        font-size: clamp(2rem, 8vw, 3rem);
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }

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

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