/* =====================================================================
   Bynteq 4.0 - Global styles (style.css)
   Uses design tokens from themes.css. Covers reset, nav, buttons,
   homepage, and course listing pages. Loaded on every page.
   ===================================================================== */

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

html {
    scroll-behavior: smooth;
}

body {
    background: var(--bg-primary);
    color: var(--text-primary);
    font-family: var(--font-sans);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

/* ---- Navigation (sticky, blurred) ---- */
nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 18px 8%;
    position: sticky;
    top: 0;
    z-index: 900;
    background: rgba(6, 6, 8, 0.72);
    backdrop-filter: blur(14px);
    border-bottom: 1px solid var(--border);
}

nav h1 {
    font-size: 28px;
    font-weight: 800;
    letter-spacing: -0.5px;
}

.nav-links {
    display: flex;
    gap: 28px;
    align-items: center;
}

.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 15px;
    font-weight: 500;
    position: relative;
    padding: 4px 0;
}

.nav-links a::after {
    content: "";
    position: absolute;
    left: 0;
    bottom: -2px;
    width: 0;
    height: 2px;
    border-radius: 2px;
    background: var(--accent);
    transition: width var(--t);
}

.nav-links a:hover {
    color: var(--text-primary);
}

.nav-links a:hover::after {
    width: 100%;
}

.logo-symbol {
    color: var(--accent);
}

/* ---- Buttons (accent-filled, themed) ---- */
button {
    font-family: inherit;
    font-size: 16px;
    font-weight: 600;
    padding: 14px 32px;
    border-radius: var(--radius-pill);
    border: none;
    background: linear-gradient(135deg, var(--accent), var(--accent-secondary));
    color: var(--accent-contrast);
    cursor: pointer;
}

button:hover {
    transform: translateY(-2px);
    box-shadow: var(--glow);
}

button:active {
    transform: translateY(0);
}

/* ---- Hero ---- */
.hero {
    text-align: center;
    padding: 110px 20px 80px;
    max-width: 900px;
    margin: 0 auto;
    position: relative;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    margin-bottom: 28px;
    border-radius: var(--radius-pill);
    background: var(--accent-soft);
    border: 1px solid var(--border-strong);
    color: var(--text-secondary);
    font-size: 14px;
    font-weight: 500;
}

.hero h2 {
    font-size: clamp(40px, 7vw, 64px);
    font-weight: 800;
    letter-spacing: -2px;
    line-height: 1.05;
}

.hero h2 .grad {
    background: linear-gradient(120deg, var(--accent), var(--accent-secondary));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    color: transparent;
}

.hero p {
    margin: 24px auto 34px;
    color: var(--text-secondary);
    font-size: 20px;
    max-width: 560px;
}

.hero button {
    font-size: 17px;
    padding: 16px 40px;
}

/* Learn -> Practice -> Build flow */
.hero-flow {
    display: flex;
    justify-content: center;
    align-items: center;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 40px;
    color: var(--text-secondary);
}

.hero-flow .step {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    border-radius: var(--radius-pill);
    background: var(--surface);
    border: 1px solid var(--border);
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
}

.hero-flow .arrow {
    color: var(--accent);
    font-weight: 700;
}

/* Hero code-window illustration */
.hero-visual {
    max-width: 620px;
    margin: 56px auto 0;
}

.hero-visual svg {
    width: 100%;
    height: auto;
    display: block;
    filter: drop-shadow(0 24px 60px rgba(0, 0, 0, 0.5));
}

/* ---- Learning path cards ---- */
.paths {
    padding: 70px 8%;
    max-width: var(--maxw);
    margin: 0 auto;
}

.section-eyebrow {
    display: block;
    text-align: center;
    color: var(--accent);
    font-weight: 700;
    font-size: 13px;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    margin-bottom: 10px;
}

.paths h2,
.why h2 {
    text-align: center;
    font-size: clamp(28px, 4vw, 38px);
    letter-spacing: -1px;
    margin-bottom: 44px;
}

.cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 22px;
}

.card {
    background: var(--surface);
    padding: 32px 28px;
    border-radius: var(--radius-lg);
    text-align: center;
    border: 1px solid var(--border);
    position: relative;
    overflow: hidden;
}

.card::before {
    content: "";
    position: absolute;
    inset: 0 0 auto 0;
    height: 3px;
    background: linear-gradient(90deg, var(--accent), var(--accent-secondary));
    transform: scaleX(0);
    transform-origin: left;
    transition: transform var(--t);
}

.card:hover {
    transform: translateY(-8px);
    border-color: var(--border-strong);
    box-shadow: var(--shadow);
}

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

/* Linked path cards */
a.card {
    text-decoration: none;
    color: inherit;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.card p {
    color: var(--text-secondary);
    font-size: 14px;
    margin-top: 8px;
}

.card__count {
    margin-top: 16px;
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--accent);
    background: var(--accent-soft);
    padding: 5px 12px;
    border-radius: var(--radius-pill);
}

/* Homepage stats strip */
.stats {
    max-width: var(--maxw);
    margin: 0 auto;
    padding: 10px 8% 0;
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 18px;
}

.stat {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 26px 18px;
    text-align: center;
}

.stat:hover {
    border-color: var(--border-strong);
    transform: translateY(-4px);
    box-shadow: var(--shadow);
}

.stat__num {
    display: block;
    font-size: clamp(28px, 4vw, 40px);
    font-weight: 800;
    letter-spacing: -1px;
    background: linear-gradient(120deg, var(--accent), var(--accent-secondary));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    color: transparent;
}

.stat__label {
    color: var(--text-secondary);
    font-size: 14px;
    font-weight: 600;
}

@media (max-width: 640px) {
    .stats {
        grid-template-columns: repeat(2, 1fr);
    }
}

.card-icon {
    display: inline-grid;
    place-items: center;
    width: 60px;
    height: 60px;
    margin-bottom: 16px;
    font-size: 30px;
    border-radius: var(--radius);
    background: var(--accent-soft);
    border: 1px solid var(--border);
}

.card h3 {
    font-size: 18px;
    font-weight: 600;
}

/* ---- Why Bynteq ---- */
.why {
    padding: 70px 8%;
    text-align: center;
    max-width: var(--maxw);
    margin: 0 auto;
}

.features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 22px;
    margin-top: 40px;
}

.features div {
    background: var(--surface);
    padding: 34px 28px;
    border-radius: var(--radius-lg);
    border: 1px solid var(--border);
    text-align: left;
}

.features div:hover {
    transform: translateY(-6px);
    border-color: var(--border-strong);
    box-shadow: var(--shadow);
}

.features h3 {
    font-size: 20px;
    margin-bottom: 10px;
}

.features p {
    color: var(--text-secondary);
}

/* ---- Footer ---- */
footer {
    text-align: center;
    padding: 50px 20px;
    color: var(--text-tertiary);
    border-top: 1px solid var(--border);
    margin-top: 40px;
}

/* =====================================================================
   Course listing / course header (shared with learn + course pages)
   ===================================================================== */
.course-header {
    text-align: center;
    padding: 70px 20px 30px;
    max-width: 820px;
    margin: 0 auto;
}

.course-header h2 {
    font-size: clamp(34px, 5vw, 50px);
    letter-spacing: -1.5px;
}

.course-header p {
    color: var(--text-secondary);
    font-size: 18px;
    margin-top: 14px;
}

.course-meta {
    display: inline-flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 10px;
    margin-top: 22px;
}

.course-meta .chip {
    padding: 7px 15px;
    border-radius: var(--radius-pill);
    background: var(--surface);
    border: 1px solid var(--border);
    font-size: 13px;
    font-weight: 600;
    color: var(--text-secondary);
}

.lessons {
    padding: 30px 8% 60px;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 22px;
    max-width: var(--maxw);
    margin: 0 auto;
}

.lesson-card {
    background: var(--surface);
    padding: 30px;
    border-radius: var(--radius-lg);
    border: 1px solid var(--border);
    display: flex;
    flex-direction: column;
}

.lesson-card:hover {
    transform: translateY(-6px);
    border-color: var(--border-strong);
    box-shadow: var(--shadow);
}

.lesson-card .lesson-tag {
    align-self: flex-start;
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--accent);
    background: var(--accent-soft);
    padding: 5px 12px;
    border-radius: var(--radius-pill);
    margin-bottom: 14px;
}

.lesson-card h3 {
    font-size: 20px;
    margin-bottom: 8px;
}

.lesson-card p {
    color: var(--text-secondary);
    margin: 0 0 22px;
    flex: 1;
}

.lesson-card button {
    width: 100%;
}

/* =====================================================================
   Responsive
   ===================================================================== */
@media (max-width: 900px) {
    nav { padding: 16px 6%; }
    .paths, .why { padding: 50px 6%; }
    .lessons { padding: 20px 6% 50px; }
}

@media (max-width: 700px) {
    nav {
        flex-direction: column;
        gap: 12px;
        padding: 16px 20px;
    }
    .nav-links {
        gap: 18px;
        flex-wrap: wrap;
        justify-content: center;
        font-size: 14px;
    }
    .hero {
        padding: 60px 20px 50px;
    }
    .hero p { font-size: 18px; }
    .hero-visual { margin-top: 40px; }
}

/* ---- Nav: active + disabled (dashboard navigation states) ---- */
.nav-links a.active {
    color: var(--text-primary);
    font-weight: 700;
}

.nav-links a.nav-disabled {
    opacity: 0.4;
    cursor: not-allowed;
    pointer-events: none;
}