/* ===================================================
   Course Landing Page Styles — Blockchain Course
   mehditmimi.com
   =================================================== */

/* ── Landing-page variables ─────────────────────────── */
:root {
    --radius:    14px;
    --radius-sm:  8px;
    --accent-btc: #f7931a;
}
[data-theme="light"] { --accent-btc: #d97706; }

/* ── Hero ───────────────────────────────────────────── */
.course-hero {
    padding: 6rem 0 4rem;
    text-align: center;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    margin-top: 70px;
    position: relative;
    overflow: hidden;
}
/* subtle chain-link grid overlay */
.course-hero::before {
    content: '';
    position: absolute; inset: 0;
    background-image:
        linear-gradient(rgba(247,147,26,0.04) 1px, transparent 1px),
        linear-gradient(90deg, rgba(247,147,26,0.04) 1px, transparent 1px);
    background-size: 40px 40px;
    pointer-events: none;
}
[data-theme="light"] .course-hero {
    background: linear-gradient(180deg, var(--bg-secondary) 0%, var(--bg-primary) 100%);
}

.hero-text {
    max-width: 740px;
    margin: 0 auto;
    position: relative;
    z-index: 1;
}

.course-eyebrow {
    display: inline-flex; align-items: center; gap: 0.5rem;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.72rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.12em;
    color: var(--accent-btc);
    background: rgba(247,147,26,0.1);
    border: 1px solid rgba(247,147,26,0.25);
    padding: 0.3rem 0.9rem;
    border-radius: 100px;
    margin-bottom: 1.2rem;
}
[data-theme="light"] .course-eyebrow { background: rgba(217,119,6,0.08); border-color: rgba(217,119,6,0.2); }

.course-title {
    font-family: 'Playfair Display', serif;
    font-size: clamp(2.2rem, 5vw, 3.6rem);
    font-weight: 700;
    line-height: 1.15;
    margin: 0 0 1rem;
    color: var(--text-primary);
}
.gradient-text {
    background: linear-gradient(135deg, #f7931a, #fbbf24);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
[data-theme="light"] .gradient-text {
    background: linear-gradient(135deg, #d97706, #b45309);
    -webkit-background-clip: text;
    background-clip: text;
}

.course-subtitle {
    font-size: 1.15rem; color: var(--text-secondary);
    line-height: 1.65; margin: 0 0 1.5rem;
    max-width: 600px; margin-left: auto; margin-right: auto;
}

.hero-cta {
    display: flex; gap: 1rem;
    justify-content: center; flex-wrap: wrap;
    margin-bottom: 2.5rem;
}

.btn {
    display: inline-flex; align-items: center; gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    border-radius: 100px;
    font-weight: 600; font-size: 0.95rem;
    text-decoration: none;
    transition: all 0.3s;
    border: none; cursor: pointer;
}
.btn-primary {
    background: linear-gradient(135deg, #f7931a, #e88c00);
    color: #fff;
    box-shadow: 0 4px 18px rgba(247,147,26,0.35);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 6px 24px rgba(247,147,26,0.5); }
.btn-outline {
    background: transparent;
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
}
.btn-outline:hover { border-color: var(--accent-btc); color: var(--accent-btc); transform: translateY(-2px); }

/* hero stats */
.hero-stats {
    display: flex; align-items: center; justify-content: center;
    gap: 2rem; flex-wrap: wrap;
    font-size: 0.88rem; color: var(--text-tertiary);
    padding-top: 1.5rem;
    border-top: 1px solid var(--border-color);
    margin-top: 0.5rem;
    position: relative; z-index: 1;
}
.hero-stat { display: flex; align-items: center; gap: 0.4rem; }
.stat-value { font-weight: 700; color: var(--text-primary); }

/* ── Section wrapper ────────────────────────────────── */
.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

.section-title {
    font-family: 'Playfair Display', serif;
    font-size: clamp(1.6rem, 3.5vw, 2.2rem);
    font-weight: 700;
    color: var(--text-primary);
    margin: 0 0 0.5rem;
}
.section-subtitle {
    font-size: 1rem; color: var(--text-tertiary);
    margin: 0 0 2.5rem;
}

/* ── Course overview section ─────────────────────────── */
.course-overview {
    padding: 5rem 0;
    background: var(--bg-primary);
}

.parts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(290px, 1fr));
    gap: 1.5rem;
    margin-top: 0.5rem;
}
.part-card {
    background: var(--bg-card, var(--bg-secondary));
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 1.75rem;
    transition: border-color 0.3s, transform 0.3s, box-shadow 0.3s;
    position: relative;
    overflow: hidden;
}
.part-card::before {
    content: '';
    position: absolute; top: 0; left: 0; right: 0; height: 3px;
    border-radius: var(--radius) var(--radius) 0 0;
}
.part-card--btc::before  { background: linear-gradient(90deg, #f7931a, #fbbf24); }
.part-card--eth::before  { background: linear-gradient(90deg, #8b5cf6, #6366f1); }
.part-card--ent::before  { background: linear-gradient(90deg, #22d3ee, #06b6d4); }
.part-card:hover { border-color: var(--border-hover); transform: translateY(-3px); box-shadow: 0 8px 28px rgba(0,0,0,0.3); }

.part-badge {
    display: inline-flex; align-items: center; gap: 0.4rem;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.68rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.1em;
    padding: 0.2rem 0.7rem;
    border-radius: 100px;
    margin-bottom: 0.75rem;
}
.part-badge--btc  { background: rgba(247,147,26,0.12); color: #f7931a; }
.part-badge--eth  { background: rgba(139,92,246,0.12);  color: #8b5cf6; }
.part-badge--ent  { background: rgba(34,211,238,0.12);  color: #22d3ee; }
[data-theme="light"] .part-badge--btc { background: rgba(217,119,6,0.08);  color: #d97706; }
[data-theme="light"] .part-badge--eth { background: rgba(124,58,237,0.08); color: #7c3aed; }
[data-theme="light"] .part-badge--ent { background: rgba(8,145,178,0.08);  color: #0891b2; }

.part-card h3 { font-size: 1.1rem; font-weight: 700; color: var(--text-primary); margin: 0 0 0.5rem; }
.part-card p  { font-size: 0.88rem; color: var(--text-tertiary); margin: 0 0 1rem; line-height: 1.6; }
.part-modules { display: flex; flex-direction: column; gap: 0.3rem; }
.part-module-item {
    display: flex; align-items: center; gap: 0.5rem;
    font-size: 0.82rem; color: var(--text-secondary);
}
.part-module-item::before { content: '→'; color: var(--accent-btc); font-weight: 700; }
.part-card--eth .part-module-item::before  { color: #8b5cf6; }
.part-card--ent .part-module-item::before  { color: #22d3ee; }

/* ── Module list ────────────────────────────────────── */
.modules-section {
    padding: 5rem 0;
    background: var(--bg-secondary);
}
[data-theme="light"] .modules-section { background: var(--bg-primary); }

.modules-list { display: flex; flex-direction: column; gap: 0.75rem; }

.module-row {
    display: grid;
    grid-template-columns: 56px 1fr auto;
    align-items: center; gap: 1.2rem;
    background: var(--bg-card, var(--bg-primary));
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: 1rem 1.5rem;
    text-decoration: none;
    transition: all 0.25s;
}
.module-row:hover {
    border-color: var(--accent-btc);
    transform: translateX(4px);
    box-shadow: 0 4px 16px rgba(247,147,26,0.12);
}
.module-row.locked { opacity: 0.5; pointer-events: none; cursor: default; }

.module-num {
    font-family: 'JetBrains Mono', monospace;
    font-size: 1rem; font-weight: 700;
    color: var(--accent-btc);
    display: flex; align-items: center; justify-content: center;
    width: 44px; height: 44px;
    border: 2px solid rgba(247,147,26,0.25);
    border-radius: 50%;
    flex-shrink: 0;
}
.module-row:hover .module-num {
    background: var(--accent-btc); color: #fff; border-color: var(--accent-btc);
}
.module-row--eth .module-num { color: #8b5cf6; border-color: rgba(139,92,246,0.25); }
.module-row--eth:hover .module-num { background: #8b5cf6; border-color: #8b5cf6; color: #fff; }
.module-row--ent .module-num { color: #22d3ee; border-color: rgba(34,211,238,0.25); }
.module-row--ent:hover .module-num { background: #22d3ee; border-color: #22d3ee; color: #fff; }

.module-info h3 { font-size: 0.95rem; font-weight: 600; color: var(--text-primary); margin: 0 0 0.2rem; }
.module-info p  { font-size: 0.82rem; color: var(--text-tertiary); margin: 0; }
.module-tags { display: flex; flex-wrap: wrap; gap: 0.3rem; margin-top: 0.4rem; }
.module-tag {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.68rem;
    background: var(--bg-tertiary); color: var(--text-tertiary);
    border: 1px solid var(--border-color);
    padding: 0.1rem 0.45rem; border-radius: 100px;
}

.module-arrow { color: var(--text-tertiary); font-size: 1.1rem; }
.module-row:hover .module-arrow { color: var(--accent-btc); }

.module-part-label {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.65rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.12em;
    padding: 2rem 0 0.5rem;
    color: var(--text-tertiary);
}

/* ── Tools section ──────────────────────────────────── */
.tools-section {
    padding: 5rem 0;
    background: var(--bg-primary);
}
.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: 1rem;
}
.tool-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: 1.2rem;
    text-align: center;
    transition: border-color 0.2s, transform 0.2s;
}
.tool-card:hover { border-color: var(--accent-btc); transform: translateY(-2px); }
.tool-icon { font-size: 2rem; margin-bottom: 0.5rem; }
.tool-name { font-size: 0.9rem; font-weight: 600; color: var(--text-primary); margin: 0 0 0.2rem; }
.tool-desc { font-size: 0.75rem; color: var(--text-tertiary); margin: 0; }
.tool-tag {
    display: inline-block; margin-top: 0.4rem;
    font-family: 'JetBrains Mono', monospace; font-size: 0.65rem;
    background: rgba(247,147,26,0.1); color: var(--accent-btc);
    border: 1px solid rgba(247,147,26,0.2);
    padding: 0.1rem 0.45rem; border-radius: 100px;
}

/* ── CTA / footer ───────────────────────────────────── */
.course-cta {
    padding: 5rem 0;
    text-align: center;
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
}
.course-cta h2 { font-family: 'Playfair Display', serif; font-size: 2rem; color: var(--text-primary); margin: 0 0 0.75rem; }
.course-cta p  { color: var(--text-tertiary); margin: 0 0 2rem; font-size: 1rem; }

/* ── Responsive ─────────────────────────────────────── */
@media (max-width: 768px) {
    .course-hero { padding: 4rem 0 3rem; }
    .course-overview, .modules-section, .tools-section, .course-cta { padding: 3.5rem 0; }
    .parts-grid { grid-template-columns: 1fr; }
    .module-row { grid-template-columns: 44px 1fr; }
    .module-arrow { display: none; }
    .hero-stats { gap: 1.2rem; }
    .tools-grid { grid-template-columns: repeat(3, 1fr); }
}

@media (max-width: 480px) {
    .hero-cta { flex-direction: column; align-items: center; }
    .tools-grid { grid-template-columns: repeat(2, 1fr); }
}