/* ============================================
   SkillForge — Warm, Bold Typography, Stripe/Cal.com Style
   ============================================ */

:root {
    --color-bg: #fffbf5;
    --color-surface: #ffffff;
    --color-warm: #fef3e2;
    --color-warm-dark: #fde6c4;
    --color-border: #e8e0d8;
    --color-text: #1a1613;
    --color-text-secondary: #78716c;
    --color-primary: #ea580c;
    --color-primary-hover: #dc2626;
    --color-primary-light: #fff7ed;
    --radius: 16px;
    --radius-sm: 10px;
    --shadow: 0 1px 3px rgba(0,0,0,0.05);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.06);
    --shadow-lg: 0 12px 32px rgba(0,0,0,0.08);
    --transition: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    font-family: 'DM Sans', -apple-system, sans-serif;
    background: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }

/* --- Nav --- */
.nav {
    position: fixed;
    top: 0; left: 0; right: 0;
    z-index: 100;
    background: rgba(255,251,245,0.85);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--color-border);
}

.nav-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    color: var(--color-text);
    font-weight: 700;
    font-size: 18px;
}

.logo-mark {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-primary);
    color: #fff;
    border-radius: 8px;
    font-weight: 700;
    font-size: 16px;
    font-family: 'DM Serif Display', serif;
}

.nav-links { display: flex; gap: 32px; }

.nav-links a {
    text-decoration: none;
    color: var(--color-text-secondary);
    font-size: 14px;
    font-weight: 500;
    transition: color var(--transition);
}

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

.nav-right { display: flex; align-items: center; gap: 16px; }

.nav-link-btn {
    text-decoration: none;
    color: var(--color-text-secondary);
    font-size: 14px;
    font-weight: 500;
}

/* --- Buttons --- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 10px 22px;
    border-radius: var(--radius-sm);
    font-size: 14px;
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    border: none;
    font-family: inherit;
    transition: all var(--transition);
    background: var(--color-primary);
    color: #fff;
}

.btn:hover {
    background: var(--color-primary-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-sm { padding: 8px 16px; font-size: 13px; }
.btn-lg { padding: 14px 28px; font-size: 15px; }

.btn-outline {
    background: transparent;
    color: var(--color-text);
    border: 1.5px solid var(--color-border);
}

.btn-outline:hover {
    background: var(--color-surface);
    border-color: var(--color-text-secondary);
}

/* --- Hero --- */
.hero {
    padding: 140px 0 80px;
}

.hero-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 64px;
    align-items: center;
}

.hero-content .badge {
    display: inline-block;
    padding: 6px 16px;
    background: var(--color-warm);
    color: var(--color-primary);
    border-radius: 100px;
    font-size: 13px;
    font-weight: 600;
    margin-bottom: 20px;
}

.hero h1 {
    font-family: 'DM Serif Display', serif;
    font-size: clamp(36px, 5vw, 56px);
    font-weight: 400;
    line-height: 1.15;
    letter-spacing: -0.01em;
    margin-bottom: 20px;
}

.hero h1 em {
    font-style: italic;
    color: var(--color-primary);
}

.hero-sub {
    font-size: 17px;
    color: var(--color-text-secondary);
    line-height: 1.7;
    margin-bottom: 32px;
    max-width: 440px;
}

.hero-actions {
    display: flex;
    align-items: center;
    gap: 24px;
}

.hero-proof {
    display: flex;
    align-items: center;
    gap: 12px;
}

.avatars {
    display: flex;
}

.avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    border: 2px solid var(--color-bg);
    margin-left: -8px;
}

.avatar:first-child { margin-left: 0; }

.hero-proof span {
    font-size: 13px;
    color: var(--color-text-secondary);
    font-weight: 500;
}

/* Hero visual */
.hero-visual {
    display: flex;
    justify-content: center;
}

.course-preview-card {
    background: var(--color-surface);
    border-radius: var(--radius);
    box-shadow: var(--shadow-lg);
    overflow: hidden;
    width: 320px;
    border: 1px solid var(--color-border);
}

.cpc-thumb {
    height: 180px;
    background: linear-gradient(135deg, #fed7aa, #fdba74);
    display: flex;
    align-items: center;
    justify-content: center;
}

.play-btn {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: rgba(0,0,0,0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    backdrop-filter: blur(8px);
}

.cpc-info {
    padding: 20px;
}

.cpc-tag {
    display: inline-block;
    padding: 3px 10px;
    background: var(--color-warm);
    color: var(--color-primary);
    border-radius: 100px;
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 8px;
}

.cpc-info h3 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 6px;
}

.cpc-meta {
    display: flex;
    gap: 12px;
    font-size: 13px;
    color: var(--color-text-secondary);
}

.cpc-progress {
    padding: 0 20px 20px;
}

.progress-bar {
    height: 6px;
    background: var(--color-border);
    border-radius: 3px;
    margin-bottom: 6px;
}

.progress-fill {
    height: 100%;
    background: var(--color-primary);
    border-radius: 3px;
}

.cpc-progress span {
    font-size: 12px;
    color: var(--color-text-secondary);
}

/* --- Trust Bar --- */
.trust-bar {
    padding: 32px 0;
    border-bottom: 1px solid var(--color-border);
}

.trust-inner {
    display: flex;
    align-items: center;
    gap: 40px;
}

.trust-inner > span {
    font-size: 13px;
    color: var(--color-text-secondary);
    white-space: nowrap;
}

.trust-logos {
    display: flex;
    gap: 40px;
    flex: 1;
    justify-content: center;
}

.trust-logo {
    font-size: 16px;
    font-weight: 700;
    color: var(--color-text-secondary);
    opacity: 0.4;
}

/* --- Sections --- */
.section { padding: 100px 0; }

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

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
    margin-bottom: 48px;
}

.section-title {
    font-family: 'DM Serif Display', serif;
    font-size: 36px;
    font-weight: 400;
    margin-bottom: 8px;
}

.section-sub {
    color: var(--color-text-secondary);
    font-size: 16px;
}

.section-warm .section-title,
.section-warm .section-sub { text-align: center; }
.section-warm .section-sub { margin-bottom: 48px; }

.filter-tabs {
    display: flex;
    gap: 4px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    padding: 4px;
}

.tab {
    padding: 8px 16px;
    border: none;
    background: transparent;
    border-radius: 7px;
    font-size: 13px;
    font-weight: 500;
    color: var(--color-text-secondary);
    cursor: pointer;
    font-family: inherit;
    transition: all var(--transition);
}

.tab.active {
    background: var(--color-text);
    color: #fff;
}

.tab:hover:not(.active) { color: var(--color-text); }

/* --- Course Grid --- */
.courses-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.course-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    overflow: hidden;
}

.course-card:hover {
    box-shadow: var(--shadow-lg);
}

.course-thumb {
    height: 160px;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
}

.course-duration {
    position: absolute;
    bottom: 10px;
    right: 10px;
    padding: 4px 10px;
    background: rgba(0,0,0,0.6);
    color: #fff;
    border-radius: 6px;
    font-size: 12px;
    font-weight: 500;
    backdrop-filter: blur(4px);
}

.course-body { padding: 20px; }

.course-tags {
    display: flex;
    gap: 8px;
    margin-bottom: 10px;
}

.tag {
    padding: 3px 10px;
    border-radius: 100px;
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.tag.design { background: #fff7ed; color: #ea580c; }
.tag.dev { background: #eef2ff; color: #6366f1; }
.tag.biz { background: #ecfdf5; color: #059669; }

.tag-level {
    font-size: 11px;
    color: var(--color-text-secondary);
    font-weight: 500;
    padding: 3px 0;
}

.course-body h3 {
    font-size: 17px;
    font-weight: 600;
    margin-bottom: 8px;
    line-height: 1.3;
}

.course-body p {
    font-size: 14px;
    color: var(--color-text-secondary);
    line-height: 1.6;
    margin-bottom: 16px;
}

.instructor {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 16px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--color-border);
}

.instructor-avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    flex-shrink: 0;
}

.instructor-name {
    display: block;
    font-size: 13px;
    font-weight: 600;
}

.instructor-role {
    display: block;
    font-size: 12px;
    color: var(--color-text-secondary);
}

.course-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.course-stats {
    display: flex;
    gap: 12px;
    font-size: 13px;
    color: var(--color-text-secondary);
}

.course-price {
    font-size: 22px;
    font-weight: 700;
    color: var(--color-text);
}

/* --- Pricing --- */
.pricing-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    align-items: start;
}

.pricing-card {
    position: relative;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 36px;
    text-align: center;
}

.pricing-card.featured {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 1px var(--color-primary), var(--shadow-lg);
}

.pricing-badge {
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    padding: 4px 16px;
    background: var(--color-primary);
    color: #fff;
    border-radius: 100px;
    font-size: 12px;
    font-weight: 600;
}

.pricing-card h3 {
    font-family: 'DM Serif Display', serif;
    font-size: 20px;
    margin-bottom: 12px;
}

.pricing-amount {
    font-size: 40px;
    font-weight: 700;
    margin-bottom: 8px;
}

.pricing-amount span {
    font-size: 16px;
    font-weight: 400;
    color: var(--color-text-secondary);
}

.pricing-card > p {
    font-size: 14px;
    color: var(--color-text-secondary);
    margin-bottom: 24px;
}

.pricing-card ul {
    list-style: none;
    text-align: left;
    margin-bottom: 28px;
}

.pricing-card li {
    padding: 8px 0;
    font-size: 14px;
    color: var(--color-text-secondary);
    border-bottom: 1px solid var(--color-border);
}

.pricing-card li:before {
    content: "✓ ";
    color: var(--color-primary);
    font-weight: 700;
}

.pricing-card .btn { width: 100%; }

/* --- Testimonial --- */
.testimonial-card {
    text-align: center;
    max-width: 640px;
    margin: 0 auto;
}

.testimonial-card blockquote {
    font-family: 'DM Serif Display', serif;
    font-size: 24px;
    line-height: 1.5;
    font-weight: 400;
    margin-bottom: 24px;
    color: var(--color-text);
}

.testimonial-author {
    display: inline-flex;
    align-items: center;
    gap: 12px;
}

/* --- Footer --- */
.footer {
    padding: 64px 0 32px;
    border-top: 1px solid var(--color-border);
}

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

.footer-brand p {
    font-size: 14px;
    color: var(--color-text-secondary);
    margin-top: 12px;
}

.footer-col h4 {
    font-size: 13px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 16px;
}

.footer-col a {
    display: block;
    font-size: 14px;
    color: var(--color-text-secondary);
    text-decoration: none;
    padding: 4px 0;
    transition: color var(--transition);
}

.footer-col a:hover { color: var(--color-text); }

.footer-bottom {
    padding-top: 24px;
    border-top: 1px solid var(--color-border);
}

.footer-bottom p {
    font-size: 13px;
    color: var(--color-text-secondary);
    text-align: center;
}

/* --- Scroll Animations --- */
.course-card {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.5s ease, transform 0.5s ease, box-shadow 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

.course-card.visible {
    opacity: 1;
    transform: translateY(0);
}

.course-card.visible:hover {
    transform: translateY(-4px);
}

.pricing-card {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.5s ease, transform 0.5s ease;
}

.pricing-card.visible {
    opacity: 1;
    transform: translateY(0);
}

.pricing-card.featured.visible {
    transform: translateY(0) scale(1.03);
}

.testimonial-card {
    opacity: 0;
    transition: opacity 0.6s ease;
}

.testimonial-card.visible {
    opacity: 1;
}

/* --- Cart Badge --- */
.cart-link { display: flex; align-items: center; }

.cart-badge {
    position: absolute;
    top: -6px;
    right: -8px;
    width: 18px;
    height: 18px;
    background: var(--color-primary);
    color: #fff;
    border-radius: 50%;
    font-size: 11px;
    font-weight: 700;
    display: flex;
    align-items: center;
    justify-content: center;
    line-height: 1;
}

.course-card[data-course-id] { cursor: pointer; }

/* --- Responsive --- */
@media (max-width: 768px) {
    .nav-links, .nav-right .nav-link-btn { display: none; }
    .hero { padding: 110px 0 60px; }
    .hero-grid { grid-template-columns: 1fr; gap: 40px; }
    .hero-visual { display: none; }
    .section-header { flex-direction: column; align-items: flex-start; gap: 16px; }
    .courses-grid { grid-template-columns: 1fr; }
    .pricing-grid { grid-template-columns: 1fr; }
    .pricing-card.featured { transform: none; }
    .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
    .trust-inner { flex-direction: column; gap: 16px; }
    .hero-actions { flex-direction: column; align-items: flex-start; }
}