/* =========================================================
   علم‌افروز — استایل صفحه اصلی
   ========================================================= */

/* ---------- Font ---------- */
@font-face {
    font-family: 'Vazirmatn';
    src: url('../fonts/Vazirmatn-Regular.woff2') format('woff2');
    font-weight: 400;
    font-style: normal;
    font-display: swap;
}
@font-face {
    font-family: 'Vazirmatn';
    src: url('../fonts/Vazirmatn-Medium.woff2') format('woff2');
    font-weight: 500;
    font-style: normal;
    font-display: swap;
}
@font-face {
    font-family: 'Vazirmatn';
    src: url('../fonts/Vazirmatn-Bold.woff2') format('woff2');
    font-weight: 700;
    font-style: normal;
    font-display: swap;
}

/* ---------- Variables ---------- */
:root {
    --color-primary:        #4EA72E;
    --color-primary-dark:   #3D8A24;
    --color-primary-soft:   #EAF5E2;
    --color-accent:         #E68A1E;
    --color-accent-dark:    #C97512;
    --color-accent-soft:    #FDF1DC;

    --color-text:           #1F2A1C;
    --color-text-muted:     #5A6656;
    --color-bg:             #FFFFFF;
    --color-bg-soft:        #F7FAF4;
    --color-bg-elevated:    #FFFFFF;
    --color-border:         #E5EBE0;

    --radius-sm: 8px;
    --radius:    14px;
    --radius-lg: 22px;

    --shadow-sm: 0 1px 2px rgba(31, 42, 28, .06);
    --shadow:    0 6px 24px rgba(31, 42, 28, .08);
    --shadow-lg: 0 20px 60px rgba(31, 42, 28, .12);

    --container: 1180px;
    --header-h:  72px;

    --t-fast:   .15s ease;
    --t-normal: .25s ease;
}

[data-theme="dark"] {
    --color-primary:       #7DCB58;
    --color-primary-dark:  #6FBF3A;
    --color-primary-soft:  #1E2E17;
    --color-accent:        #F2A33C;
    --color-accent-dark:   #E68A1E;
    --color-accent-soft:   #2A2114;

    --color-text:          #E8F0E4;
    --color-text-muted:    #A8B5A2;
    --color-bg:            #12180F;
    --color-bg-soft:       #1A2216;
    --color-bg-elevated:   #1E2818;
    --color-border:        #2A3624;

    --shadow-sm: 0 1px 2px rgba(0, 0, 0, .3);
    --shadow:    0 6px 24px rgba(0, 0, 0, .35);
    --shadow-lg: 0 20px 60px rgba(0, 0, 0, .5);
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
    margin: 0;
    font-family: 'Vazirmatn', system-ui, -apple-system, 'Segoe UI', Tahoma, sans-serif;
    font-size: 16px;
    line-height: 1.75;
    color: var(--color-text);
    background: var(--color-bg);
    -webkit-font-smoothing: antialiased;
    transition: background-color var(--t-normal), color var(--t-normal);
    overflow-x: hidden;
}
img, svg { max-width: 100%; display: block; }
a { color: var(--color-primary); text-decoration: none; transition: color var(--t-fast); }
a:hover { color: var(--color-primary-dark); }
button { font-family: inherit; cursor: pointer; }

/* ---------- Layout ---------- */
.container {
    width: 100%;
    max-width: var(--container);
    margin-inline: auto;
    padding-inline: 20px;
}

.section { padding: 88px 0; }
.section-head { margin-bottom: 44px; max-width: 720px; }
.section-head-center { margin-inline: auto; text-align: center; }
.section-head-flex {
    display: flex;
    align-items: flex-end;
    justify-content: space-between;
    gap: 24px;
    max-width: none;
}
.section-eyebrow {
    margin: 0 0 10px;
    color: var(--color-accent);
    font-weight: 700;
    font-size: 14px;
    letter-spacing: .02em;
}
.section-head h2 {
    margin: 0 0 12px;
    font-size: clamp(24px, 3.4vw, 36px);
    line-height: 1.35;
    font-weight: 700;
}
.section-lead { color: var(--color-text-muted); margin: 0; font-size: 17px; }

/* ---------- Buttons ---------- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 22px;
    border-radius: var(--radius);
    border: 1px solid transparent;
    font-weight: 700;
    font-size: 15px;
    line-height: 1;
    text-align: center;
    transition: transform var(--t-fast), background-color var(--t-fast),
                border-color var(--t-fast), color var(--t-fast), box-shadow var(--t-fast);
    white-space: nowrap;
}
.btn-primary {
    background: var(--color-primary);
    color: #fff;
    box-shadow: 0 6px 20px rgba(78, 167, 46, .25);
}
.btn-primary:hover {
    background: var(--color-primary-dark);
    color: #fff;
    transform: translateY(-1px);
    box-shadow: 0 10px 26px rgba(78, 167, 46, .32);
}
.btn-accent {
    background: var(--color-accent);
    color: #fff;
    box-shadow: 0 6px 20px rgba(230, 138, 30, .28);
}
.btn-accent:hover {
    background: var(--color-accent-dark);
    color: #fff;
    transform: translateY(-1px);
}
.btn-ghost {
    background: transparent;
    color: var(--color-text);
    border-color: var(--color-border);
}
.btn-ghost:hover {
    background: var(--color-bg-soft);
    color: var(--color-text);
}
.btn-lg { padding: 15px 28px; font-size: 16px; border-radius: var(--radius); }
.btn-block { width: 100%; }

.link-arrow {
    color: var(--color-primary);
    font-weight: 700;
    white-space: nowrap;
}
.link-arrow:hover { color: var(--color-primary-dark); }

/* ---------- Skip Link ---------- */
.skip-link {
    position: absolute;
    top: -100px;
    right: 20px;
    background: var(--color-primary);
    color: #fff;
    padding: 10px 16px;
    border-radius: var(--radius-sm);
    z-index: 1000;
    font-weight: 700;
}
.skip-link:focus { top: 12px; color: #fff; }

.visually-hidden {
    position: absolute !important;
    width: 1px; height: 1px;
    padding: 0; margin: -1px;
    overflow: hidden; clip: rect(0,0,0,0);
    white-space: nowrap; border: 0;
}

.placeholder-note {
    grid-column: 1 / -1;
    color: var(--color-text-muted);
    background: var(--color-bg-soft);
    padding: 32px;
    border-radius: var(--radius);
    text-align: center;
}

/* =========================================================
   HEADER
   ========================================================= */
.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: color-mix(in srgb, var(--color-bg) 88%, transparent);
    backdrop-filter: saturate(180%) blur(12px);
    -webkit-backdrop-filter: saturate(180%) blur(12px);
    border-bottom: 1px solid var(--color-border);
    transition: background-color var(--t-normal), border-color var(--t-normal);
}
.header-inner {
    display: flex;
    align-items: center;
    gap: 24px;
    min-height: var(--header-h);
}

.brand {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--color-text);
    font-weight: 700;
}
.brand img { width: 44px; height: 44px; }
.brand-text { display: flex; flex-direction: column; line-height: 1.2; }
.brand-text strong { font-size: 17px; }
.brand-text small { color: var(--color-text-muted); font-weight: 500; font-size: 11.5px; }

.main-nav { margin-inline-start: auto; }
.main-nav ul {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    gap: 22px;
}
.main-nav a {
    color: var(--color-text);
    font-size: 15px;
    font-weight: 500;
    position: relative;
}
.main-nav a:hover { color: var(--color-primary); }

.header-actions {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-inline-start: auto;
}
.main-nav + .header-actions { margin-inline-start: 0; }

.theme-toggle {
    width: 40px; height: 40px;
    border-radius: 50%;
    border: 1px solid var(--color-border);
    background: transparent;
    color: var(--color-text);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: background-color var(--t-fast), border-color var(--t-fast);
}
.theme-toggle:hover { background: var(--color-bg-soft); }
.theme-toggle .icon-moon { display: none; }
[data-theme="dark"] .theme-toggle .icon-sun  { display: none; }
[data-theme="dark"] .theme-toggle .icon-moon { display: block; }

.menu-toggle {
    display: none;
    width: 42px; height: 42px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--color-border);
    background: transparent;
    padding: 10px;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
}
.menu-toggle span {
    display: block;
    height: 2px;
    background: var(--color-text);
    border-radius: 2px;
    transition: transform var(--t-fast), opacity var(--t-fast);
}
.menu-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.menu-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.menu-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* =========================================================
   HERO
   ========================================================= */
.hero {
    position: relative;
    padding: 72px 0 88px;
    background:
        radial-gradient(1000px 500px at 85% -10%, var(--color-primary-soft), transparent 60%),
        radial-gradient(600px 400px at 0% 30%, var(--color-accent-soft), transparent 60%),
        var(--color-bg);
    overflow: hidden;
}
.hero-inner {
    display: grid;
    grid-template-columns: 1.1fr .9fr;
    gap: 56px;
    align-items: center;
}
.hero-eyebrow {
    display: inline-block;
    margin: 0 0 18px;
    padding: 6px 14px;
    background: var(--color-bg-elevated);
    border: 1px solid var(--color-border);
    border-radius: 999px;
    font-size: 13px;
    font-weight: 700;
    color: var(--color-primary-dark);
}
[data-theme="dark"] .hero-eyebrow { color: var(--color-primary); }

.hero h1 {
    margin: 0 0 20px;
    font-size: clamp(30px, 5vw, 54px);
    line-height: 1.2;
    font-weight: 700;
    letter-spacing: -.01em;
}
.hero-lead {
    margin: 0 0 32px;
    font-size: clamp(16px, 1.6vw, 19px);
    color: var(--color-text-muted);
    max-width: 540px;
}
.hero-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-bottom: 16px;
}
.hero-note {
    margin: 0;
    font-size: 13.5px;
    color: var(--color-text-muted);
}

.hero-media {
    position: relative;
    aspect-ratio: 1 / 1;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
}
.hero-media img {
    width: 100%; height: 100%;
    object-fit: cover;
}

/* =========================================================
   TRUST BAR
   ========================================================= */
.trust-bar {
    padding: 24px 0;
    background: var(--color-bg-soft);
    border-block: 1px solid var(--color-border);
}
.trust-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
}
.trust-item {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 14.5px;
    font-weight: 500;
    color: var(--color-text);
}
.trust-item svg { color: var(--color-primary); flex-shrink: 0; }

/* =========================================================
   ABOUT
   ========================================================= */
.about-inner { max-width: 820px; margin-inline: auto; }
.about-body p { font-size: 17px; color: var(--color-text-muted); margin: 0 0 18px; }
.about-body p:last-child { margin-bottom: 0; }

/* =========================================================
   FEATURES
   ========================================================= */
.features { background: var(--color-bg-soft); }
.feature-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 22px;
}
.feature-card {
    background: var(--color-bg-elevated);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 28px 24px;
    transition: transform var(--t-normal), box-shadow var(--t-normal), border-color var(--t-normal);
}
.feature-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow);
    border-color: color-mix(in srgb, var(--color-primary) 40%, var(--color-border));
}
.feature-icon {
    width: 48px; height: 48px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-sm);
    background: var(--color-primary-soft);
    color: var(--color-primary);
    margin-bottom: 16px;
}
.feature-card h3 {
    margin: 0 0 8px;
    font-size: 17px;
    font-weight: 700;
}
.feature-card p {
    margin: 0;
    color: var(--color-text-muted);
    font-size: 14.5px;
}

/* =========================================================
   TEACHERS
   ========================================================= */
.teacher-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 22px;
}
.teacher-card {
    background: var(--color-bg-elevated);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 20px;
    text-align: center;
}
.teacher-photo {
    width: 110px; height: 110px;
    border-radius: 50%;
    overflow: hidden;
    margin: 0 auto 14px;
    background: var(--color-bg-soft);
}
.teacher-photo img { width: 100%; height: 100%; object-fit: cover; }
.teacher-card h3 { margin: 0 0 4px; font-size: 16px; }
.teacher-role { margin: 0; color: var(--color-text-muted); font-size: 13.5px; }

/* =========================================================
   NEWS
   ========================================================= */
.news-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 22px;
}
.news-card {
    background: var(--color-bg-elevated);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    overflow: hidden;
    transition: transform var(--t-normal), box-shadow var(--t-normal);
}
.news-card:hover { transform: translateY(-3px); box-shadow: var(--shadow); }
.news-card a { color: inherit; display: block; }
.news-thumb { aspect-ratio: 16 / 10; overflow: hidden; background: var(--color-bg-soft); }
.news-thumb img { width: 100%; height: 100%; object-fit: cover; transition: transform .5s ease; }
.news-card:hover .news-thumb img { transform: scale(1.04); }
.news-body { padding: 18px 20px 22px; }
.news-body time { display: block; font-size: 12.5px; color: var(--color-text-muted); margin-bottom: 6px; }
.news-body h3 { margin: 0 0 8px; font-size: 16.5px; line-height: 1.5; }
.news-body p { margin: 0; color: var(--color-text-muted); font-size: 14px; }

/* =========================================================
   GALLERY
   ========================================================= */
.gallery { background: var(--color-bg-soft); }
.gallery-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 12px;
}
.gallery-item {
    display: block;
    aspect-ratio: 4 / 3;
    border-radius: var(--radius-sm);
    overflow: hidden;
    background: var(--color-bg-elevated);
}
.gallery-item img {
    width: 100%; height: 100%;
    object-fit: cover;
    transition: transform .5s ease;
}
.gallery-item:hover img { transform: scale(1.05); }

/* =========================================================
   TESTIMONIALS
   ========================================================= */
.testimonial-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 22px;
}
.testimonial-card {
    margin: 0;
    background: var(--color-bg-elevated);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 26px 24px;
}
.testimonial-card blockquote {
    margin: 0 0 16px;
    font-size: 15.5px;
    line-height: 1.9;
    color: var(--color-text);
}
.testimonial-card figcaption { display: flex; flex-direction: column; }
.testimonial-card .name { font-weight: 700; font-size: 14.5px; }
.testimonial-card .role { color: var(--color-text-muted); font-size: 13px; }

/* =========================================================
   PREREGISTER
   ========================================================= */
.preregister {
    background:
        radial-gradient(700px 400px at 10% 20%, var(--color-primary-soft), transparent 60%),
        var(--color-bg);
}
.preregister-inner {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 56px;
    align-items: start;
}
.preregister-intro h2 {
    margin: 0 0 16px;
    font-size: clamp(24px, 3.2vw, 34px);
    line-height: 1.35;
}
.preregister-intro p { color: var(--color-text-muted); font-size: 16.5px; }
.preregister-note { color: var(--color-accent); font-weight: 700; }

.preregister-form {
    background: var(--color-bg-elevated);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 30px;
    box-shadow: var(--shadow);
}
.form-row { margin-bottom: 16px; }
.form-row label {
    display: block;
    font-size: 14px;
    font-weight: 700;
    margin-bottom: 6px;
}
.form-row input,
.form-row select,
.form-row textarea {
    width: 100%;
    font-family: inherit;
    font-size: 15px;
    padding: 11px 14px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    background: var(--color-bg);
    color: var(--color-text);
    transition: border-color var(--t-fast), box-shadow var(--t-fast);
}
.form-row input:focus,
.form-row select:focus,
.form-row textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px color-mix(in srgb, var(--color-primary) 25%, transparent);
}
.form-row textarea { resize: vertical; min-height: 90px; }

.hp-field {
    position: absolute;
    left: -9999px;
    width: 1px; height: 1px;
    overflow: hidden;
}

.form-status {
    margin: 14px 0 0;
    font-size: 14px;
    min-height: 22px;
}
.form-status.ok    { color: var(--color-primary); }
.form-status.error { color: #D23F3F; }

/* =========================================================
   FINAL CTA
   ========================================================= */
.final-cta {
    background:
        linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
    color: #fff;
    text-align: center;
}
.final-cta h2 {
    margin: 0 0 26px;
    font-size: clamp(24px, 3.4vw, 36px);
    line-height: 1.4;
    color: #fff;
}
.final-cta .btn-accent {
    background: #fff;
    color: var(--color-primary-dark);
    box-shadow: 0 10px 30px rgba(0,0,0,.15);
}
.final-cta .btn-accent:hover {
    background: #F2F7EE;
    color: var(--color-primary-dark);
}

/* =========================================================
   FOOTER
   ========================================================= */
.site-footer {
    background: var(--color-bg-soft);
    border-top: 1px solid var(--color-border);
    padding-top: 60px;
}
.footer-grid {
    display: grid;
    grid-template-columns: 1.4fr 1fr 1fr 1fr;
    gap: 36px;
    padding-bottom: 44px;
}
.footer-col h3 {
    margin: 0 0 16px;
    font-size: 15px;
    font-weight: 700;
}
.footer-col ul {
    list-style: none;
    margin: 0;
    padding: 0;
}
.footer-col ul li { margin-bottom: 8px; font-size: 14px; color: var(--color-text-muted); }
.footer-col a { color: var(--color-text-muted); }
.footer-col a:hover { color: var(--color-primary); }

.footer-brand img { width: 52px; height: 52px; margin-bottom: 12px; }
.footer-name { margin: 0 0 6px; font-weight: 700; font-size: 15px; }
.footer-tagline { margin: 0; color: var(--color-text-muted); font-size: 14px; }

.footer-bottom {
    border-top: 1px solid var(--color-border);
    padding: 18px 0;
    font-size: 13px;
    color: var(--color-text-muted);
    text-align: center;
}

/* =========================================================
   LIGHTBOX
   ========================================================= */
.lightbox {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, .85);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    padding: 20px;
}
.lightbox.is-open { display: flex; }
.lightbox img {
    max-width: 95vw;
    max-height: 90vh;
    border-radius: var(--radius);
}
.lightbox-close {
    position: absolute;
    top: 20px; left: 20px;
    width: 44px; height: 44px;
    border-radius: 50%;
    border: none;
    background: rgba(255,255,255,.15);
    color: #fff;
    font-size: 22px;
    line-height: 1;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

/* =========================================================
   RESPONSIVE
   ========================================================= */
@media (max-width: 1024px) {
    .hero-inner { grid-template-columns: 1fr; gap: 40px; }
    .hero-media { max-width: 480px; margin-inline: auto; }
    .feature-grid { grid-template-columns: repeat(2, 1fr); }
    .teacher-grid { grid-template-columns: repeat(2, 1fr); }
    .news-grid    { grid-template-columns: repeat(2, 1fr); }
    .gallery-grid { grid-template-columns: repeat(3, 1fr); }
    .testimonial-grid { grid-template-columns: 1fr 1fr; }
    .preregister-inner { grid-template-columns: 1fr; gap: 36px; }
    .footer-grid { grid-template-columns: 1fr 1fr; }
    .trust-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 720px) {
    .section { padding: 60px 0; }
    .section-head-flex { flex-direction: column; align-items: flex-start; }

    .main-nav {
        position: fixed;
        inset: var(--header-h) 0 auto 0;
        background: var(--color-bg);
        border-bottom: 1px solid var(--color-border);
        padding: 20px;
        transform: translateY(-12px);
        opacity: 0;
        pointer-events: none;
        transition: transform var(--t-normal), opacity var(--t-normal);
        max-height: calc(100vh - var(--header-h));
        overflow-y: auto;
        margin-inline-start: 0;
    }
    .main-nav.is-open {
        transform: translateY(0);
        opacity: 1;
        pointer-events: auto;
    }
    .main-nav ul {
        flex-direction: column;
        gap: 4px;
    }
    .main-nav a {
        display: block;
        padding: 12px 8px;
        border-radius: var(--radius-sm);
        font-size: 16px;
    }
    .main-nav a:hover { background: var(--color-bg-soft); }

    .menu-toggle { display: inline-flex; }
    .header-cta { display: none; }

    .brand-text small { display: none; }

    .feature-grid,
    .teacher-grid,
    .news-grid,
    .gallery-grid,
    .testimonial-grid { grid-template-columns: 1fr; }

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

    .trust-grid { grid-template-columns: 1fr 1fr; gap: 12px; }
    .trust-item { font-size: 13.5px; }

    .footer-grid { grid-template-columns: 1fr; gap: 28px; }

    .hero { padding: 40px 0 60px; }
    .hero-actions .btn { flex: 1 1 auto; }

    .preregister-form { padding: 22px; }
}

@media (max-width: 400px) {
    .trust-grid { grid-template-columns: 1fr; }
    .brand-text strong { font-size: 15px; }
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: .001ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: .001ms !important;
        scroll-behavior: auto !important;
    }
}