/* ===== RESET & BASE ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
    --bg-primary: #0f1117;
    --bg-secondary: #1a1d2e;
    --bg-card: #222640;
    --accent: #e53e3e;
    --accent-hover: #c53030;
    --text-primary: #e2e8f0;
    --text-secondary: #a0aec0;
    --text-muted: #718096;
    --border: #2d3348;
    --success: #48bb78;
    --radius: 8px;
    --max-width: 1100px;
}

html { scroll-behavior: smooth; }

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

a { color: var(--accent); text-decoration: none; transition: color 0.2s; }
a:hover { color: var(--accent-hover); }

img { max-width: 100%; display: block; }

/* ===== NAVBAR ===== */
.navbar {
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border);
    padding: 0 24px;
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav-inner {
    max-width: var(--max-width);
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}

.nav-logo {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
    white-space: nowrap;
}

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

.nav-links {
    display: flex;
    gap: 8px;
    list-style: none;
}

.nav-links a {
    color: var(--text-secondary);
    padding: 8px 14px;
    border-radius: var(--radius);
    font-size: 0.9rem;
    font-weight: 500;
    transition: background 0.2s, color 0.2s;
}

.nav-links a:hover,
.nav-links a.active {
    background: var(--bg-card);
    color: var(--text-primary);
}

.nav-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: 1.5rem;
    cursor: pointer;
}

/* ===== HERO ===== */
.hero {
    text-align: center;
    padding: 80px 24px 60px;
    background: linear-gradient(180deg, var(--bg-secondary) 0%, var(--bg-primary) 100%);
}

.hero h1 {
    font-size: 2.8rem;
    font-weight: 800;
    margin-bottom: 16px;
    line-height: 1.2;
}

.hero h1 span { color: var(--accent); }

.hero p {
    font-size: 1.15rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto 32px;
}

.hero-buttons {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}

/* ===== BUTTONS ===== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 28px;
    border-radius: var(--radius);
    font-size: 0.95rem;
    font-weight: 600;
    border: none;
    cursor: pointer;
    transition: background 0.2s, transform 0.1s;
}

.btn:active { transform: scale(0.97); }

.btn-primary {
    background: var(--accent);
    color: white;
}
.btn-primary:hover { background: var(--accent-hover); color: white; }

.btn-outline {
    background: transparent;
    color: var(--text-primary);
    border: 1px solid var(--border);
}
.btn-outline:hover { background: var(--bg-card); color: var(--text-primary); }

/* ===== SECTIONS ===== */
.section {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 60px 24px;
}

.section-title {
    font-size: 1.8rem;
    font-weight: 700;
    margin-bottom: 12px;
}

.section-subtitle {
    color: var(--text-secondary);
    margin-bottom: 40px;
    font-size: 1.05rem;
}

/* ===== FEATURE CARDS ===== */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
}

.feature-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 28px;
    transition: border-color 0.2s, transform 0.2s;
}

.feature-card:hover {
    border-color: var(--accent);
    transform: translateY(-2px);
}

.feature-icon {
    font-size: 2rem;
    margin-bottom: 16px;
}

.feature-card h3 {
    font-size: 1.1rem;
    margin-bottom: 8px;
}

.feature-card p {
    color: var(--text-secondary);
    font-size: 0.92rem;
}

/* ===== PAGE HEADER ===== */
.page-header {
    text-align: center;
    padding: 60px 24px 40px;
    background: linear-gradient(180deg, var(--bg-secondary) 0%, var(--bg-primary) 100%);
}

.page-header h1 {
    font-size: 2.2rem;
    font-weight: 800;
    margin-bottom: 12px;
}

.page-header p {
    color: var(--text-secondary);
    font-size: 1.05rem;
    max-width: 600px;
    margin: 0 auto;
}

/* ===== FORMS ===== */
.form-container {
    max-width: 640px;
    margin: 0 auto;
    padding: 0 24px 60px;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: 6px;
    color: var(--text-primary);
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 12px 16px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    color: var(--text-primary);
    font-size: 0.95rem;
    font-family: inherit;
    transition: border-color 0.2s;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--accent);
}

.form-group textarea {
    min-height: 140px;
    resize: vertical;
}

.form-group .hint {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-top: 4px;
}

.form-success {
    display: none;
    text-align: center;
    padding: 40px;
    background: var(--bg-card);
    border: 1px solid var(--success);
    border-radius: var(--radius);
    margin-top: 20px;
}

.form-success.show { display: block; }

.form-success h3 {
    color: var(--success);
    margin-bottom: 8px;
}

/* ===== FAQ / ACCORDION ===== */
.faq-list {
    max-width: 760px;
    margin: 0 auto;
}

.faq-item {
    border: 1px solid var(--border);
    border-radius: var(--radius);
    margin-bottom: 12px;
    overflow: hidden;
}

.faq-question {
    width: 100%;
    text-align: left;
    background: var(--bg-card);
    border: none;
    padding: 18px 24px;
    color: var(--text-primary);
    font-size: 1rem;
    font-weight: 600;
    font-family: inherit;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: background 0.2s;
}

.faq-question:hover { background: #2a2f4a; }

.faq-question::after {
    content: '+';
    font-size: 1.3rem;
    font-weight: 300;
    color: var(--text-muted);
    transition: transform 0.2s;
}

.faq-item.open .faq-question::after {
    content: '\2212';
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
}

.faq-answer-inner {
    padding: 16px 24px 20px;
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.7;
}

.faq-answer-inner a { text-decoration: underline; }

/* ===== TUTORIALS ===== */
.tutorial-list {
    display: flex;
    flex-direction: column;
    gap: 20px;
    max-width: 800px;
    margin: 0 auto;
}

.tutorial-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 28px;
}

.tutorial-card h3 {
    font-size: 1.15rem;
    margin-bottom: 6px;
}

.tutorial-meta {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-bottom: 12px;
}

.tutorial-card p {
    color: var(--text-secondary);
    font-size: 0.93rem;
    margin-bottom: 16px;
}

.tutorial-steps {
    list-style: none;
    counter-reset: step;
}

.tutorial-steps li {
    counter-increment: step;
    padding: 10px 0 10px 40px;
    position: relative;
    color: var(--text-secondary);
    font-size: 0.92rem;
    border-left: 2px solid var(--border);
    margin-left: 14px;
}

.tutorial-steps li::before {
    content: counter(step);
    position: absolute;
    left: -15px;
    top: 8px;
    width: 28px;
    height: 28px;
    background: var(--accent);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.8rem;
    font-weight: 700;
}

.tutorial-steps li:last-child { border-left-color: transparent; }

/* ===== CTA BANNER ===== */
.cta-banner {
    text-align: center;
    padding: 60px 24px;
    background: var(--bg-secondary);
    border-top: 1px solid var(--border);
}

.cta-banner h2 {
    font-size: 1.6rem;
    margin-bottom: 12px;
}

.cta-banner p {
    color: var(--text-secondary);
    margin-bottom: 24px;
}

/* ===== FOOTER ===== */
.footer {
    margin-top: auto;
    background: var(--bg-secondary);
    border-top: 1px solid var(--border);
    padding: 32px 24px;
    text-align: center;
}

.footer-inner {
    max-width: var(--max-width);
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 16px;
}

.footer-links {
    display: flex;
    gap: 20px;
    list-style: none;
}

.footer-links a {
    color: var(--text-muted);
    font-size: 0.85rem;
}

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

.footer-copy {
    color: var(--text-muted);
    font-size: 0.85rem;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
    .nav-toggle { display: block; }

    .nav-links {
        display: none;
        position: absolute;
        top: 64px;
        left: 0;
        right: 0;
        background: var(--bg-secondary);
        border-bottom: 1px solid var(--border);
        flex-direction: column;
        padding: 16px;
        gap: 4px;
    }

    .nav-links.open { display: flex; }

    .nav-links a {
        padding: 12px 16px;
        width: 100%;
    }

    .hero h1 { font-size: 2rem; }
    .hero-buttons { flex-direction: column; align-items: center; }

    .section-title { font-size: 1.5rem; }
    .page-header h1 { font-size: 1.8rem; }

    .footer-inner {
        flex-direction: column;
        text-align: center;
    }

    .footer-links { justify-content: center; }
}