/* =============================================
   Machine Learning Lab — Styles
   ============================================= */

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

:root {
    --bg: #0a0a0a;
    --surface: #111111;
    --surface-hover: #161412;
    --text: #ccc8c0;
    --text-dim: #6b6860;
    --text-faded: #3a3836;
    --accent: #8b2020;
    --accent-dim: rgba(139, 32, 32, 0.25);
    --border: #222220;
    --success: #4a7c59;
}

body {
    font-family: 'EB Garamond', Georgia, serif;
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
    line-height: 1.6;
}

/* --- Typography --- */

h1, h2, h3, h4, h5, h6 {
    font-family: 'EB Garamond', Georgia, serif;
    font-weight: 400;
    line-height: 1.2;
    color: var(--text);
    margin-bottom: 1rem;
}

h1 { font-size: clamp(2.2rem, 5vw, 3.8rem); }
h2 { font-size: clamp(1.6rem, 3vw, 2.4rem); }
h3 { font-size: 1.4rem; }

p { margin-bottom: 1rem; }

a {
    color: var(--text);
    text-decoration: none;
    transition: color 0.3s;
}

a:hover { color: var(--accent); }

main { min-height: calc(100vh - 120px); }

section {
    padding: 4rem 2rem;
    max-width: 1100px;
    margin: 0 auto;
}

/* --- Buttons --- */

.btn {
    display: inline-block;
    font-family: 'Inter', sans-serif;
    font-size: 0.7rem;
    font-weight: 600;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    padding: 12px 32px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s;
    text-decoration: none;
    border: none;
}

.btn-primary {
    background: var(--accent);
    color: #ccc8c0;
}

.btn-primary:hover {
    background: #a02424;
    color: #ccc8c0;
}

.btn-secondary {
    background: transparent;
    color: var(--text-dim);
    border: 1px solid var(--border);
}

.btn-secondary:hover {
    border-color: var(--text-dim);
    color: var(--text);
}

.btn-large {
    padding: 16px 48px;
    font-size: 0.75rem;
}

/* --- Header --- */

.site-header {
    background: var(--bg);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.header-container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 20px 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo a {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    text-decoration: none;
    color: var(--text);
    font-family: 'EB Garamond', Georgia, serif;
    font-size: 1.3rem;
    letter-spacing: 0.02em;
    transition: color 0.3s;
}

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

.logo-icon { display: none; }

.main-nav {
    display: flex;
    gap: 2rem;
    align-items: center;
}

.main-nav a {
    font-family: 'Inter', sans-serif;
    font-size: 0.65rem;
    font-weight: 300;
    letter-spacing: 0.3em;
    text-transform: uppercase;
    color: var(--text-dim);
    text-decoration: none;
    transition: color 0.3s;
}

.main-nav a:hover,
.main-nav a.active { color: var(--text); }

.nav-cta {
    color: var(--accent) !important;
    border: 1px solid var(--accent-dim);
    padding: 6px 16px;
}

.nav-cta:hover {
    background: var(--accent-dim);
    color: var(--accent) !important;
}

@media (max-width: 768px) {
    .main-nav { gap: 1rem; }
}

/* --- Footer --- */

.site-footer {
    background: var(--bg);
    border-top: 1px solid var(--border);
    padding: 40px 2rem 24px;
    margin-top: 4rem;
}

.footer-container {
    max-width: 1100px;
    margin: 0 auto;
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-section h4 {
    font-family: 'EB Garamond', Georgia, serif;
    font-size: 1rem;
    font-weight: 400;
    color: var(--text);
    margin-bottom: 1rem;
}

.footer-section p,
.footer-section ul li {
    font-family: 'Inter', sans-serif;
    font-size: 0.7rem;
    font-weight: 300;
    letter-spacing: 0.05em;
    color: var(--text-dim);
    margin-bottom: 0.4rem;
    line-height: 1.6;
}

.footer-section ul { list-style: none; }

.footer-section a {
    color: var(--text-dim);
    text-decoration: none;
    transition: color 0.3s;
}

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

.footer-bottom {
    border-top: 1px solid var(--border);
    padding-top: 1rem;
    text-align: center;
    font-family: 'Inter', sans-serif;
    font-size: 0.6rem;
    font-weight: 300;
    letter-spacing: 0.2em;
    color: var(--text-faded);
}

@media (max-width: 640px) {
    .footer-grid { grid-template-columns: 1fr 1fr; }
}

/* --- Hero --- */

.hero {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
    padding: 6rem 2rem;
    border-bottom: 1px solid var(--border);
    max-width: 1100px;
    margin: 0 auto;
}

.hero-content h1 { margin-bottom: 0.5rem; }

.tagline {
    font-family: 'Inter', sans-serif;
    font-size: 0.65rem;
    font-weight: 300;
    letter-spacing: 0.4em;
    text-transform: uppercase;
    color: var(--text-dim);
    margin-bottom: 1.5rem;
}

.hero .subtitle {
    font-style: italic;
    font-size: 1.1rem;
    color: var(--text-dim);
    margin-bottom: 0.75rem;
    line-height: 1.6;
}

.profile-note {
    font-family: 'Inter', sans-serif;
    font-size: 0.72rem;
    color: var(--text-faded);
    margin-bottom: 2rem;
    line-height: 1.6;
}

.cta-buttons {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.hero-image img {
    width: 100%;
    border: 1px solid var(--border);
}

@media (max-width: 768px) {
    .hero { grid-template-columns: 1fr; gap: 2rem; padding: 4rem 2rem; }
}

/* --- Features --- */

.features { border-bottom: 1px solid var(--border); }

.features h2,
.audience h2,
.demo h2,
.workflows h2,
.pricing h2,
.cta h2 {
    text-align: center;
    margin-bottom: 3rem;
    font-weight: 400;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2px;
}

.feature-card {
    padding: 2rem;
    background: var(--surface);
    border: 1px solid var(--border);
    position: relative;
    transition: background 0.3s;
}

.feature-card::after {
    content: '';
    position: absolute;
    top: 0; left: 0;
    width: 3px; height: 100%;
    background: var(--accent);
    transform: scaleY(0);
    transform-origin: bottom;
    transition: transform 0.35s ease;
}

.feature-card:hover { background: var(--surface-hover); }
.feature-card:hover::after { transform: scaleY(1); }

.feature-icon {
    font-family: 'Inter', sans-serif;
    font-size: 0.55rem;
    font-weight: 700;
    letter-spacing: 0.3em;
    text-transform: uppercase;
    color: var(--text-faded);
    margin-bottom: 1rem;
}

.feature-card h3 {
    font-size: 1.2rem;
    margin-bottom: 0.75rem;
}

.feature-card p {
    font-family: 'Inter', sans-serif;
    font-size: 0.8rem;
    color: var(--text-dim);
    line-height: 1.6;
    margin-bottom: 0;
}

/* --- Audience --- */

.audience { border-bottom: 1px solid var(--border); }

.audience-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2px;
}

.audience-card {
    padding: 2rem;
    background: var(--surface);
    border: 1px solid var(--border);
    position: relative;
    transition: background 0.3s;
}

.audience-card::after {
    content: '';
    position: absolute;
    top: 0; left: 0;
    width: 3px; height: 100%;
    background: var(--accent);
    transform: scaleY(0);
    transform-origin: bottom;
    transition: transform 0.35s ease;
}

.audience-card:hover { background: var(--surface-hover); }
.audience-card:hover::after { transform: scaleY(1); }

.audience-card h3 { font-size: 1.2rem; margin-bottom: 0.75rem; }

.audience-card p {
    font-family: 'Inter', sans-serif;
    font-size: 0.8rem;
    color: var(--text-dim);
    line-height: 1.6;
    margin-bottom: 0;
}

/* --- Demo --- */

.demo {
    text-align: center;
    border-bottom: 1px solid var(--border);
}

.video-container {
    max-width: 800px;
    margin: 0 auto;
    border: 1px solid var(--border);
}

.video-placeholder {
    background: var(--surface);
    padding: 4rem 2rem;
    font-family: 'Inter', sans-serif;
    font-size: 0.65rem;
    letter-spacing: 0.3em;
    text-transform: uppercase;
    color: var(--text-faded);
}

/* --- Workflows --- */

.workflows { border-bottom: 1px solid var(--border); }

.workflow-list {
    max-width: 800px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.workflow-item {
    background: var(--surface);
    padding: 2rem;
    border: 1px solid var(--border);
    position: relative;
    transition: background 0.3s;
}

.workflow-item::after {
    content: '';
    position: absolute;
    top: 0; left: 0;
    width: 3px; height: 100%;
    background: var(--accent);
    transform: scaleY(0);
    transform-origin: bottom;
    transition: transform 0.35s ease;
}

.workflow-item:hover { background: var(--surface-hover); }
.workflow-item:hover::after { transform: scaleY(1); }

.workflow-item h3 { font-size: 1.2rem; margin-bottom: 0.5rem; }

.workflow-item p {
    font-family: 'Inter', sans-serif;
    font-size: 0.8rem;
    color: var(--text-dim);
    line-height: 1.6;
    margin-bottom: 0;
}

/* --- Pricing --- */

.pricing { text-align: center; border-bottom: 1px solid var(--border); }

.pricing-card {
    max-width: 500px;
    margin: 0 auto;
    padding: 3rem;
    background: var(--surface);
    border: 1px solid var(--border);
    text-align: left;
}

.price {
    font-family: 'EB Garamond', Georgia, serif;
    font-size: 4rem;
    font-weight: 400;
    color: var(--text);
    margin: 1rem 0;
}

.price-desc {
    font-family: 'Inter', sans-serif;
    font-size: 0.65rem;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--text-dim);
    margin-bottom: 2rem;
}

.features-list { list-style: none; margin: 2rem 0; }

.features-list li {
    font-family: 'Inter', sans-serif;
    font-size: 0.8rem;
    padding: 0.5rem 0;
    color: var(--text-dim);
    border-bottom: 1px solid var(--border);
}

.features-list li:last-child { border-bottom: none; }

/* --- CTA --- */

.cta { text-align: center; }

.cta p {
    font-family: 'Inter', sans-serif;
    font-size: 0.8rem;
    color: var(--text-dim);
    margin-bottom: 2rem;
}

/* --- Auth Pages --- */

.auth-page {
    background: var(--bg);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 4rem 2rem;
}

.auth-container {
    width: 100%;
    max-width: 480px;
}

.auth-box {
    background: var(--surface);
    padding: 3rem;
    border: 1px solid var(--border);
}

.auth-box h1 {
    text-align: center;
    margin-bottom: 0.5rem;
}

.auth-box .subtitle {
    font-family: 'Inter', sans-serif;
    font-size: 0.75rem;
    font-style: normal;
    text-align: center;
    color: var(--text-dim);
    margin-bottom: 2rem;
    letter-spacing: 0.05em;
}

.form-options {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    font-family: 'Inter', sans-serif;
    font-size: 0.75rem;
    color: var(--text-dim);
}

.checkbox-label {
    display: flex;
    align-items: center;
    cursor: pointer;
}

.checkbox-label input { margin-right: 0.5rem; }

.forgot-link { color: var(--text-dim); transition: color 0.3s; }
.forgot-link:hover { color: var(--text); }

.auth-footer {
    margin-top: 2rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border);
    text-align: center;
    font-family: 'Inter', sans-serif;
    font-size: 0.75rem;
    color: var(--text-dim);
}

/* --- Forms --- */

.purchase-form,
.auth-form { max-width: 600px; }

.form-section {
    margin-bottom: 2rem;
    padding-bottom: 2rem;
    border-bottom: 1px solid var(--border);
}

.form-section:last-of-type { border-bottom: none; }

.form-section h3 { font-size: 1.1rem; margin-bottom: 1rem; }

.form-note {
    font-family: 'Inter', sans-serif;
    font-size: 0.75rem;
    color: var(--text-dim);
    margin-bottom: 1.5rem;
}

.form-group { margin-bottom: 1.5rem; }

.form-group label {
    display: block;
    font-family: 'Inter', sans-serif;
    font-size: 0.6rem;
    font-weight: 600;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--text-dim);
    margin-bottom: 0.5rem;
}

.form-group input,
.form-group select {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid var(--border);
    font-family: 'Inter', sans-serif;
    font-size: 0.85rem;
    background: var(--bg);
    color: var(--text);
    transition: border-color 0.3s;
    border-radius: 0;
    outline: none;
}

.form-group input:focus,
.form-group select:focus { border-color: var(--text-dim); }

.form-group small {
    display: block;
    margin-top: 0.25rem;
    font-family: 'Inter', sans-serif;
    font-size: 0.7rem;
    color: var(--text-faded);
}

.form-row {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 1rem;
}

.checkbox-group label {
    display: flex;
    align-items: center;
    font-family: 'Inter', sans-serif;
    font-size: 0.8rem;
    font-weight: normal;
    letter-spacing: 0;
    text-transform: none;
    cursor: pointer;
    color: var(--text-dim);
}

.checkbox-group input[type="checkbox"] {
    width: auto;
    margin-right: 0.5rem;
}

.form-actions {
    margin-top: 2rem;
    text-align: center;
}

.secure-note {
    margin-top: 1rem;
    font-family: 'Inter', sans-serif;
    font-size: 0.7rem;
    color: var(--text-faded);
}

/* --- Messages --- */

.error-message {
    background: rgba(139, 32, 32, 0.08);
    color: #c45050;
    padding: 1rem;
    margin-top: 1rem;
    border-left: 3px solid var(--accent);
    font-family: 'Inter', sans-serif;
    font-size: 0.8rem;
}

.success-message {
    background: rgba(74, 124, 89, 0.08);
    color: #6aaa7e;
    padding: 1rem;
    margin-top: 1rem;
    border-left: 3px solid var(--success);
    font-family: 'Inter', sans-serif;
    font-size: 0.8rem;
}

.input-error { border-color: var(--accent) !important; }

.field-error-text {
    font-family: 'Inter', sans-serif;
    color: #c45050;
    font-size: 0.75rem;
    margin-top: 6px;
    display: block;
}

/* --- Notice Page --- */

.notice-page {
    background: var(--bg);
    min-height: calc(100vh - 120px);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 4rem 2rem;
}

.notice-container {
    width: 100%;
    max-width: 640px;
}

.notice-box {
    background: var(--surface);
    padding: 3rem;
    border: 1px solid var(--border);
    text-align: center;
}

.notice-box h1 { margin-bottom: 1rem; }
.notice-box p { color: var(--text-dim); font-family: 'Inter', sans-serif; font-size: 0.9rem; margin-bottom: 1rem; }
.notice-box .btn { margin-top: 1rem; }

/* --- Purchase Page --- */

.purchase-page { background: var(--bg); }

.purchase-container {
    padding: 4rem 2rem;
    max-width: 1100px;
    margin: 0 auto;
}

.purchase-container h1 {
    text-align: center;
    margin-bottom: 0.5rem;
}

.purchase-container > .subtitle {
    font-family: 'Inter', sans-serif;
    font-size: 0.65rem;
    letter-spacing: 0.3em;
    text-transform: uppercase;
    color: var(--text-dim);
    text-align: center;
    margin-bottom: 3rem;
    font-style: normal;
}

.purchase-layout {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 3rem;
}

.product-summary {
    position: sticky;
    top: 6rem;
    height: fit-content;
}

.product-card {
    background: var(--surface);
    padding: 2rem;
    border: 1px solid var(--border);
}

.price-display { text-align: center; margin: 2rem 0; }

.price-display .currency {
    font-family: 'Inter', sans-serif;
    font-size: 1.5rem;
    vertical-align: top;
    color: var(--text-dim);
}

.price-display .amount {
    font-family: 'EB Garamond', Georgia, serif;
    font-size: 4rem;
    font-weight: 400;
    color: var(--text);
}

.price-display .period {
    display: block;
    font-family: 'Inter', sans-serif;
    font-size: 0.6rem;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--text-faded);
    margin-top: -0.5rem;
}

.included-features { list-style: none; margin: 1.5rem 0; }

.included-features li {
    font-family: 'Inter', sans-serif;
    font-size: 0.78rem;
    padding: 0.4rem 0;
    color: var(--text-dim);
    border-bottom: 1px solid var(--border);
}

.included-features li:last-child { border-bottom: none; }

.security-badges {
    margin-top: 2rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border);
    text-align: center;
    font-family: 'Inter', sans-serif;
    font-size: 0.65rem;
    letter-spacing: 0.1em;
    color: var(--text-faded);
}

.purchase-form-container {
    background: var(--surface);
    padding: 2rem;
    border: 1px solid var(--border);
}

/* --- User Info Card --- */

.user-info-card {
    background: var(--surface);
    color: var(--text);
    padding: 1.5rem;
    border: 1px solid var(--border);
    margin-bottom: 1.5rem;
}

.user-info-card h3 { font-size: 1rem; margin-bottom: 0.75rem; }

.license-info .info-row {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 0.6rem;
    font-family: 'Inter', sans-serif;
    font-size: 0.8rem;
}

.license-info .label { width: 120px; color: var(--text-dim); }
.license-info .value { color: var(--text); font-weight: 600; }

/* --- Checkout Page --- */

.checkout-page {
    background: var(--bg);
    min-height: 100vh;
    padding: 4rem 2rem;
}

.checkout-container {
    max-width: 700px;
    margin: 0 auto;
}

.checkout-success {
    background: var(--surface);
    padding: 3rem;
    border: 1px solid var(--border);
    text-align: center;
}

.success-icon {
    width: 64px;
    height: 64px;
    border: 1px solid var(--accent);
    color: var(--accent);
    font-size: 1.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 2rem;
    font-family: 'Inter', sans-serif;
}

.order-details {
    text-align: left;
    background: var(--bg);
    padding: 1.5rem;
    border: 1px solid var(--border);
    margin: 2rem 0;
}

.detail-row {
    display: flex;
    justify-content: space-between;
    padding: 0.6rem 0;
    border-bottom: 1px solid var(--border);
    font-family: 'Inter', sans-serif;
    font-size: 0.8rem;
    color: var(--text-dim);
}

.detail-row:last-child { border-bottom: none; }

.license-key {
    font-family: 'Courier New', monospace;
    font-weight: 600;
    color: var(--text);
    letter-spacing: 1px;
}

.next-steps { text-align: left; margin: 2rem 0; }
.next-steps h2 { font-size: 1.4rem; margin-bottom: 1rem; }
.next-steps ol { margin-left: 1.5rem; }

.next-steps li {
    font-family: 'Inter', sans-serif;
    font-size: 0.8rem;
    color: var(--text-dim);
    margin: 0.5rem 0;
}

.checkout-actions {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
    margin-top: 2rem;
}

.support-note {
    margin-top: 1.5rem;
    font-family: 'Inter', sans-serif;
    font-size: 0.75rem;
    color: var(--text-faded);
}

/* --- Utility --- */

.hidden { display: none !important; }