/* ============================================================
   EDTECH21 SOLUTIONS — MAIN STYLESHEET
   Light theme | Fully responsive | Vanilla scroll/parallax hooks
   ============================================================ */

/* ---------- Design Tokens ---------- */
:root {
    /* Brand colors (official — per brand guide) */
    --color-teal:        #15B5B0;
    --color-teal-dark:   #0E8A86;
    --color-navy:        #16294D;
    --color-amber:       #F6D13E;
    --color-amber-dark:  #E8961A;

    /* Neutrals */
    --color-bg:          #FAFAF7;
    --color-bg-tint:     #EAF4F3;
    --color-surface:     #FFFFFF;
    --color-border:      #E3E1D9;
    --color-text:        #1F2937;
    --color-text-muted:  #5B6472;

    /* Type */
    --font-display: 'Space Grotesk', sans-serif;
    --font-body:    'Inter', sans-serif;
    --font-mono:    'JetBrains Mono', monospace;

    /* Layout */
    --container-width: 1200px;
    --radius: 14px;
    --radius-sm: 8px;
    --shadow-soft: 0 4px 20px rgba(22, 41, 77, 0.06);
    --shadow-hover: 0 12px 32px rgba(22, 41, 77, 0.12);
    --transition: 0.35s cubic-bezier(0.2, 0.7, 0.3, 1);
}

/* ---------- Reset ---------- */
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    font-family: var(--font-body);
    color: var(--color-text);
    background: var(--color-bg);
    line-height: 1.6;
    overflow-x: hidden;
}
img { max-width: 100%; display: block; }
a { text-decoration: none; color: inherit; }
ul { list-style: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }
h1, h2, h3, h4 {
    font-family: var(--font-display);
    color: var(--color-navy);
    line-height: 1.2;
}

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

@media (prefers-reduced-motion: reduce) {
    html { scroll-behavior: auto; }
    * { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
}

/* ---------- Buttons ---------- */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 28px;
    border-radius: 999px;
    font-weight: 600;
    font-size: 0.95rem;
    transition: transform var(--transition), box-shadow var(--transition), background var(--transition);
}
.btn-primary {
    background: var(--color-teal);
    color: #fff;
    box-shadow: var(--shadow-soft);
}
.btn-primary:hover { background: var(--color-teal-dark); transform: translateY(-2px); box-shadow: var(--shadow-hover); }
.btn-outline {
    background: transparent;
    border: 2px solid var(--color-navy);
    color: var(--color-navy);
}
.btn-outline:hover { background: var(--color-navy); color: #fff; transform: translateY(-2px); }

/* ---------- Header / Nav ---------- */
.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: #FFFFFF;
    border-bottom: 1px solid var(--color-border);
    box-shadow: 0 1px 3px rgba(22, 41, 77, 0.04);
    transition: box-shadow var(--transition);
}
.site-header.scrolled { box-shadow: var(--shadow-soft); }

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 76px;
}

.logo { display: flex; align-items: center; gap: 12px; }
.logo-mark {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 42px;
    height: 42px;
    border-radius: var(--radius-sm);
    background: var(--color-teal-dark);
    color: #fff;
    font-family: var(--font-mono);
    font-weight: 500;
    font-size: 0.9rem;
}
.logo-text {
    font-family: var(--font-display);
    font-weight: 800;
    font-size: 1.2rem;
    color: var(--color-teal-dark);
    display: flex;
    flex-direction: column;
    line-height: 1.1;
}
.logo-sub {
    font-family: var(--font-mono);
    font-size: 0.62rem;
    font-weight: 700;
    letter-spacing: 0.15em;
    color: var(--color-amber-dark);
}

.main-nav { display: flex; gap: 8px; }
.main-nav a {
    padding: 10px 16px;
    border-radius: 999px;
    font-weight: 500;
    color: var(--color-text-muted);
    transition: background var(--transition), color var(--transition);
}
.main-nav a:hover, .main-nav a.active {
    background: var(--color-bg-tint);
    color: var(--color-teal-dark);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    width: 32px;
}
.nav-toggle span {
    height: 2px;
    background: var(--color-navy);
    border-radius: 2px;
    transition: transform var(--transition), opacity var(--transition);
}

/* ---------- Hero ---------- */
.hero {
    position: relative;
    padding: 110px 0 140px;
    overflow: hidden;
    background: linear-gradient(180deg, var(--color-bg-tint) 0%, var(--color-bg) 100%);
}
.hero-blueprint-grid {
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(var(--color-border) 1px, transparent 1px),
        linear-gradient(90deg, var(--color-border) 1px, transparent 1px);
    background-size: 48px 48px;
    opacity: 0.35;
    will-change: transform;
}
.hero-inner {
    position: relative;
    z-index: 2;
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: 48px;
    align-items: center;
}
.hero-eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-family: var(--font-mono);
    font-size: 0.8rem;
    letter-spacing: 0.05em;
    color: var(--color-teal-dark);
    background: rgba(15, 122, 117, 0.08);
    padding: 6px 14px;
    border-radius: 999px;
    margin-bottom: 20px;
}
.hero h1 {
    font-size: clamp(2.2rem, 4.2vw, 3.6rem);
    font-weight: 700;
    margin-bottom: 20px;
}
.hero h1 span { color: var(--color-amber-dark); }
.hero p {
    font-size: 1.1rem;
    color: var(--color-text-muted);
    max-width: 480px;
    margin-bottom: 32px;
}
.hero-ctas { display: flex; gap: 16px; flex-wrap: wrap; }

.hero-visual {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
}
.hero-visual svg { width: 100%; max-width: 420px; }
.blueprint-line {
    fill: none;
    stroke: var(--color-navy);
    stroke-width: 2;
    stroke-linecap: round;
    stroke-linejoin: round;
    stroke-dasharray: 900;
    stroke-dashoffset: 900;
    animation: draw 2.4s cubic-bezier(0.2, 0.7, 0.3, 1) forwards 0.3s;
}
.blueprint-accent { fill: var(--color-amber); opacity: 0; animation: fadeIn 0.6s ease forwards 2.2s; }
@keyframes draw { to { stroke-dashoffset: 0; } }
@keyframes fadeIn { to { opacity: 1; } }

.hero-stats {
    display: flex;
    gap: 32px;
    margin-top: 40px;
    padding-top: 32px;
    border-top: 1px solid var(--color-border);
}
.hero-stat strong {
    display: block;
    font-family: var(--font-display);
    font-size: 1.8rem;
    color: var(--color-navy);
}
.hero-stat span {
    font-size: 0.85rem;
    color: var(--color-text-muted);
}

/* ---------- Section basics ---------- */
.section { padding: 100px 0; }
.section-tint { background: var(--color-bg-tint); }
.section-head {
    max-width: 640px;
    margin: 0 auto 56px;
    text-align: center;
}
.section-tag {
    display: inline-block;
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--color-teal-dark);
    letter-spacing: 0.1em;
    margin-bottom: 12px;
}
.section-head h2 {
    font-size: clamp(1.8rem, 3vw, 2.6rem);
    margin-bottom: 16px;
}
.section-head p { color: var(--color-text-muted); font-size: 1.05rem; }

/* ---------- Trust badges ---------- */
.badge-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}
.badge-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 28px 20px;
    text-align: center;
    transition: transform var(--transition), box-shadow var(--transition);
}
.badge-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-hover); }
.badge-icon {
    width: 48px; height: 48px;
    margin: 0 auto 16px;
    color: var(--color-teal);
}
.badge-card h4 { font-size: 1rem; margin-bottom: 6px; }
.badge-card p { font-size: 0.88rem; color: var(--color-text-muted); }

/* ---------- Category grid (Home page preview) ---------- */
.category-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 24px;
}
.category-card {
    position: relative;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 32px 24px;
    transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}
.category-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-hover);
    border-color: var(--color-teal);
}
.category-card .cat-tag {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    color: var(--color-amber-dark);
    letter-spacing: 0.08em;
}
.category-card .cat-icon {
    width: 40px; height: 40px;
    color: var(--color-teal);
    margin: 14px 0 16px;
}
.category-card h3 { font-size: 1.15rem; margin-bottom: 8px; }
.category-card p { font-size: 0.9rem; color: var(--color-text-muted); margin-bottom: 16px; }
.category-card .cat-link {
    font-weight: 600;
    font-size: 0.88rem;
    color: var(--color-teal-dark);
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

/* ---------- Product filter bar (Products page) ---------- */
.filter-bar {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    justify-content: center;
    margin-bottom: 56px;
    padding: 12px 0;
}
.filter-btn {
    padding: 10px 20px;
    border-radius: 999px;
    border: 1.5px solid var(--color-border);
    font-size: 0.88rem;
    font-weight: 500;
    color: var(--color-text-muted);
    background: var(--color-surface);
    transition: all var(--transition);
    white-space: nowrap;
}
.filter-btn:hover { border-color: var(--color-teal); color: var(--color-teal-dark); }
.filter-btn.active {
    background: var(--color-teal);
    border-color: var(--color-teal);
    color: #fff;
}

/* ---------- Category section (Products page) ---------- */
.product-category-block { margin-bottom: 90px; scroll-margin-top: 160px; }
.product-category-block:last-child { margin-bottom: 0; }
.category-block-head {
    display: flex;
    align-items: baseline;
    gap: 16px;
    margin-bottom: 32px;
    padding-bottom: 16px;
    border-bottom: 2px solid var(--color-border);
}
.category-block-head .tag {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--color-amber-dark);
}
.category-block-head h2 { font-size: 1.6rem; }
.category-block-desc { color: var(--color-text-muted); margin: -20px 0 32px; max-width: 620px; }

/* ---------- Product grid & card ---------- */
.product-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 28px;
}
.product-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    overflow: hidden;
    transition: transform var(--transition), box-shadow var(--transition);
}
.product-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-hover); }
.product-card-img {
    aspect-ratio: 4 / 3;
    background: var(--color-surface);
    overflow: hidden;
    padding: 16px;
}
.product-card-img img {
    width: 100%; height: 100%;
    object-fit: contain;
    transition: transform 0.6s ease;
}
.product-card:hover .product-card-img img { transform: scale(1.06); }
.product-card-body { padding: 20px; }
.product-card-body h3 { font-size: 1.02rem; margin-bottom: 6px; }
.product-card-body p { font-size: 0.87rem; color: var(--color-text-muted); }

/* ---------- Scroll reveal (JS toggles .in-view) ---------- */
.reveal {
    opacity: 0;
    transform: translateY(32px);
    transition: opacity 0.8s cubic-bezier(0.2, 0.7, 0.3, 1), transform 0.8s cubic-bezier(0.2, 0.7, 0.3, 1);
}
.reveal.in-view { opacity: 1; transform: translateY(0); }
.reveal-stagger > * { transition-delay: calc(var(--i, 0) * 80ms); }

/* ---------- About page specifics ---------- */
.about-hero { text-align: center; padding-top: 90px; }
.mission-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
    margin-top: 48px;
}
.mission-card {
    text-align: center;
    padding: 36px 24px;
    background: var(--color-surface);
    border-radius: var(--radius);
    border: 1px solid var(--color-border);
}
.mission-card .num {
    font-family: var(--font-mono);
    color: var(--color-amber-dark);
    font-size: 0.85rem;
}
.mission-card h3 { margin: 12px 0 10px; font-size: 1.2rem; }
.mission-card p { color: var(--color-text-muted); font-size: 0.92rem; }

/* ---------- Contact page ---------- */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 48px;
    align-items: start;
}
.contact-info-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 32px;
}
.contact-info-card ul li { margin-bottom: 18px; display: flex; gap: 12px; }
.form-group { margin-bottom: 20px; }
.form-group label { display: block; font-size: 0.88rem; font-weight: 500; margin-bottom: 8px; }
.form-group input, .form-group textarea {
    width: 100%;
    padding: 14px 16px;
    border: 1.5px solid var(--color-border);
    border-radius: var(--radius-sm);
    font-family: var(--font-body);
    font-size: 0.95rem;
    background: var(--color-surface);
    transition: border-color var(--transition);
}
.form-group input:focus, .form-group textarea:focus {
    outline: none;
    border-color: var(--color-teal);
}
.form-group textarea { resize: vertical; min-height: 140px; }

/* ---------- 404 page ---------- */
.error-page {
    min-height: 60vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 80px 24px;
}
.error-code {
    font-family: var(--font-display);
    font-size: clamp(4rem, 12vw, 8rem);
    color: var(--color-teal);
    line-height: 1;
}

/* ---------- Footer ---------- */
.site-footer { background: var(--color-navy); color: #cdd6e5; margin-top: 100px; }
.footer-inner {
    display: grid;
    grid-template-columns: 1.6fr 1fr 1fr 1fr;
    gap: 40px;
    padding: 72px 24px 48px;
}
.footer-tagline { color: var(--color-amber-dark); font-size: 0.85rem; margin: 14px 0 12px; }
.footer-about { font-size: 0.88rem; color: #9fadc4; max-width: 320px; }
.footer-col h4 { color: #fff; font-size: 0.95rem; margin-bottom: 18px; }
.footer-col ul li { margin-bottom: 12px; }
.footer-col a { font-size: 0.88rem; color: #9fadc4; transition: color var(--transition); }
.footer-col a:hover { color: var(--color-amber); }
.footer-bottom { border-top: 1px solid rgba(255,255,255,0.1); }
.footer-bottom-inner {
    display: flex;
    justify-content: space-between;
    padding: 22px 24px;
    font-size: 0.82rem;
    color: #7d8bab;
    flex-wrap: wrap;
    gap: 8px;
}

/* ============================================================
   RESPONSIVE BREAKPOINTS
   ============================================================ */

@media (min-width: 1600px) {
    :root { --container-width: 1440px; }
    .hero h1 { font-size: 4.2rem; }
}

@media (max-width: 992px) {
    .hero-inner { grid-template-columns: 1fr; text-align: center; }
    .hero-ctas { justify-content: center; }
    .hero-stats { justify-content: center; }
    .hero-visual { order: -1; margin-bottom: 20px; }
    .badge-grid { grid-template-columns: repeat(2, 1fr); }
    .mission-grid { grid-template-columns: 1fr; }
    .contact-grid { grid-template-columns: 1fr; }
    .footer-inner { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
    .nav-toggle { display: flex; }
    .main-nav {
        position: fixed;
        top: 76px;
        left: 0;
        right: 0;
        background: var(--color-surface);
        flex-direction: column;
        padding: 12px 24px 24px;
        border-bottom: 1px solid var(--color-border);
        transform: translateY(-140%);
        opacity: 0;
        transition: transform var(--transition), opacity var(--transition);
    }
    .main-nav.open { transform: translateY(0); opacity: 1; }
    .main-nav a { padding: 14px 12px; }

    .hero { padding: 60px 0 90px; }
    .hero-visual { order: 1; margin-top: 32px; margin-bottom: 0; }
    .section { padding: 64px 0; }
    .badge-grid { grid-template-columns: 1fr 1fr; gap: 16px; }
    .footer-inner { grid-template-columns: 1fr; padding: 56px 24px 32px; }
}

@media (max-width: 480px) {
    .hero-ctas { flex-direction: column; width: 100%; }
    .hero-ctas .btn { width: 100%; justify-content: center; }
    .badge-grid { grid-template-columns: 1fr; }
    .hero-stats { flex-direction: column; gap: 16px; text-align: center; }
}