/* ============================================================
   创业陪跑教练 — 主题网站样式
   ============================================================ */

:root {
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --primary-light: #3b82f6;
    --accent: #f59e0b;
    --accent-red: #ef4444;
    --bg-dark: #0f172a;
    --bg-card: #1e293b;
    --bg-section: #f8fafc;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-light: #94a3b8;
    --border: #e2e8f0;
    --gradient-hero: linear-gradient(135deg, #0f172a 0%, #1e3a5f 50%, #0f172a 100%);
    --gradient-idea: linear-gradient(135deg, #fef3c7 0%, #fde68a 100%);
    --gradient-validation: linear-gradient(135deg, #dbeafe 0%, #93c5fd 100%);
    --radius: 12px;
    --shadow: 0 1px 3px rgba(0,0,0,0.08), 0 4px 16px rgba(0,0,0,0.04);
    --shadow-lg: 0 8px 32px rgba(0,0,0,0.08);
}

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

html { scroll-behavior: smooth; }

body {
    font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    color: var(--text-primary);
    line-height: 1.7;
    background: #fff;
    -webkit-font-smoothing: antialiased;
}

/* ============================================================
   导航
   ============================================================ */
.navbar {
    position: fixed;
    top: 0; left: 0; right: 0;
    z-index: 1000;
    background: rgba(15, 23, 42, 0.92);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid rgba(255,255,255,0.06);
    transition: all 0.3s;
}
.navbar.scrolled {
    background: rgba(15, 23, 42, 0.98);
    box-shadow: 0 1px 8px rgba(0,0,0,0.3);
}
.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.nav-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    color: #fff;
    font-weight: 700;
    font-size: 1.15rem;
    letter-spacing: 0.02em;
}
.logo-icon { font-size: 1.4rem; }
.nav-links { display: flex; align-items: center; gap: 28px; }
.nav-links a {
    color: rgba(255,255,255,0.75);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
    transition: color 0.2s;
}
.nav-links a:hover { color: #fff; }
.nav-cta {
    background: var(--primary);
    color: #fff !important;
    padding: 8px 20px;
    border-radius: 24px;
    font-weight: 600 !important;
    transition: background 0.2s !important;
}
.nav-cta:hover { background: var(--primary-dark) !important; }

/* ============================================================
   Hero
   ============================================================ */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-hero);
    overflow: hidden;
    padding: 120px 24px 80px;
}
.hero-bg {
    position: absolute;
    inset: 0;
    background:
        radial-gradient(ellipse 80% 60% at 50% 0%, rgba(37,99,235,0.15) 0%, transparent 60%),
        radial-gradient(ellipse 50% 40% at 80% 80%, rgba(245,158,11,0.08) 0%, transparent 60%);
    pointer-events: none;
}
.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    max-width: 780px;
}
.hero-badge {
    display: inline-block;
    background: rgba(37,99,235,0.2);
    border: 1px solid rgba(37,99,235,0.35);
    color: #93c5fd;
    padding: 6px 18px;
    border-radius: 24px;
    font-size: 0.85rem;
    font-weight: 500;
    margin-bottom: 28px;
}
.hero-title {
    font-size: clamp(2.2rem, 5vw, 3.2rem);
    font-weight: 900;
    color: #fff;
    line-height: 1.3;
    margin-bottom: 20px;
    letter-spacing: 0.01em;
}
.hero-highlight {
    background: linear-gradient(135deg, #60a5fa, #fbbf24);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.hero-subtitle {
    font-size: 1.1rem;
    color: rgba(255,255,255,0.65);
    line-height: 1.8;
    margin-bottom: 36px;
}
.hero-cta-row {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 56px;
}
.btn-primary {
    display: inline-block;
    background: var(--primary);
    color: #fff;
    padding: 14px 32px;
    border-radius: 28px;
    text-decoration: none;
    font-weight: 600;
    font-size: 1rem;
    transition: all 0.25s;
}
.btn-primary:hover { background: var(--primary-dark); transform: translateY(-1px); box-shadow: 0 6px 20px rgba(37,99,235,0.35); }
.btn-secondary {
    display: inline-block;
    background: rgba(255,255,255,0.1);
    color: #fff;
    padding: 14px 32px;
    border-radius: 28px;
    text-decoration: none;
    font-weight: 600;
    font-size: 1rem;
    border: 1px solid rgba(255,255,255,0.2);
    transition: all 0.25s;
}
.btn-secondary:hover { background: rgba(255,255,255,0.18); border-color: rgba(255,255,255,0.35); }
.btn-large { padding: 18px 48px; font-size: 1.1rem; }

.hero-stats {
    display: flex;
    gap: 40px;
    justify-content: center;
    flex-wrap: wrap;
}
.stat-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
}
.stat-number {
    font-size: 1.8rem;
    font-weight: 800;
    color: #fff;
}
.stat-label {
    font-size: 0.8rem;
    color: rgba(255,255,255,0.5);
    font-weight: 500;
}

/* ============================================================
   通用 Section
   ============================================================ */
.section-header {
    text-align: center;
    max-width: 680px;
    margin: 0 auto 56px;
}
.section-tag {
    display: inline-block;
    background: rgba(37,99,235,0.08);
    color: var(--primary);
    padding: 4px 16px;
    border-radius: 16px;
    font-size: 0.8rem;
    font-weight: 600;
    margin-bottom: 16px;
    letter-spacing: 0.04em;
    text-transform: uppercase;
}
.section-header h2 {
    font-size: clamp(1.6rem, 3.5vw, 2.2rem);
    font-weight: 800;
    color: var(--text-primary);
    margin-bottom: 12px;
}
.section-desc {
    font-size: 1.05rem;
    color: var(--text-secondary);
    line-height: 1.8;
}

/* ============================================================
   阶段模型
   ============================================================ */
.stages-section {
    padding: 100px 24px;
    background: var(--bg-section);
}
.stages-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    align-items: stretch;
    gap: 0;
}
.stage-card {
    flex: 1;
    background: #fff;
    border-radius: var(--radius);
    padding: 40px 32px;
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
    position: relative;
    overflow: hidden;
}
.stage-card::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 4px;
}
.stage-idea::before { background: linear-gradient(90deg, #f59e0b, #fbbf24); }
.stage-validation::before { background: linear-gradient(90deg, #2563eb, #60a5fa); }

.stage-badge {
    display: inline-block;
    background: rgba(100,116,139,0.08);
    color: var(--text-secondary);
    padding: 3px 12px;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 600;
    margin-bottom: 12px;
}
.stage-number {
    font-size: 2rem;
    font-weight: 900;
    background: linear-gradient(135deg, #1e293b, #64748b);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 4px;
}
.stage-card h3 {
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: 8px;
}
.stage-goal {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 20px;
    line-height: 1.6;
}
.stage-persona {
    display: flex;
    gap: 12px;
    align-items: center;
    background: rgba(37,99,235,0.04);
    padding: 12px 16px;
    border-radius: 8px;
    margin-bottom: 20px;
}
.persona-label {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-light);
    text-transform: uppercase;
    letter-spacing: 0.06em;
    white-space: nowrap;
}
.persona-value {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--primary);
}
.daily-three {
    margin-bottom: 20px;
}
.daily-three h4 {
    font-size: 0.85rem;
    font-weight: 700;
    margin-bottom: 8px;
    color: var(--text-primary);
}
.daily-three ol {
    list-style-position: inside;
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 2;
}
.node-list h4 {
    font-size: 0.85rem;
    font-weight: 700;
    margin-bottom: 10px;
    color: var(--text-primary);
}
.node-chips {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}
.node-chips span {
    background: rgba(100,116,139,0.06);
    padding: 4px 10px;
    border-radius: 6px;
    font-size: 0.75rem;
    color: var(--text-secondary);
    font-weight: 500;
    white-space: nowrap;
}
.node-chips .node-key {
    background: rgba(245,158,11,0.12);
    color: #b45309;
    font-weight: 600;
}

/* 连接器 */
.stages-connector {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 0 20px;
    min-width: 80px;
}
.connector-line {
    width: 2px;
    height: 50px;
    background: linear-gradient(to bottom, var(--border), var(--primary-light), var(--border));
}
.connector-text {
    padding: 10px 0;
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--primary);
    writing-mode: vertical-rl;
    letter-spacing: 0.1em;
}

/* ============================================================
   核心能力
   ============================================================ */
.features-section {
    padding: 100px 24px;
    background: #fff;
}
.features-grid {
    max-width: 1100px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 28px;
}
.feature-card {
    background: var(--bg-section);
    border-radius: var(--radius);
    padding: 32px 24px;
    border: 1px solid var(--border);
    transition: transform 0.2s, box-shadow 0.2s;
}
.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}
.feature-icon { font-size: 2.2rem; margin-bottom: 16px; }
.feature-card h3 {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 8px;
}
.feature-card p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.7;
}

/* ============================================================
   教练角色
   ============================================================ */
.persona-section {
    padding: 100px 24px;
    background: var(--bg-section);
}
.persona-grid {
    max-width: 1100px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 28px;
}
.persona-card {
    background: #fff;
    border-radius: var(--radius);
    padding: 32px 28px;
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
}
.persona-icon { font-size: 2rem; margin-bottom: 14px; }
.persona-card h3 {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 8px;
}
.persona-card > p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 14px;
}
.persona-rules {
    list-style: none;
    padding: 0;
}
.persona-rules li {
    font-size: 0.85rem;
    color: var(--text-secondary);
    padding: 6px 0;
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    gap: 8px;
}
.persona-rules li::before {
    content: '✓';
    color: var(--primary);
    font-weight: 700;
    font-size: 0.85rem;
}
.persona-rules li:last-child { border-bottom: none; }
.persona-quote {
    background: rgba(245,158,11,0.08);
    border-left: 3px solid var(--accent);
    padding: 12px 16px;
    border-radius: 0 8px 8px 0;
    margin-top: 12px;
}
.persona-quote p {
    font-size: 0.9rem;
    color: #92400e;
    font-weight: 500;
    font-style: italic;
    margin: 0;
}

/* ============================================================
   方法论步骤
   ============================================================ */
.methodology-section {
    padding: 100px 24px;
    background: #fff;
}
.methodology-steps {
    max-width: 800px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 0;
}
.step {
    display: flex;
    gap: 28px;
    padding: 32px 0;
    border-bottom: 1px solid var(--border);
    align-items: flex-start;
}
.step:last-child { border-bottom: none; }
.step-number {
    font-size: 2.2rem;
    font-weight: 900;
    color: rgba(37,99,235,0.15);
    line-height: 1;
    min-width: 60px;
}
.step-content h3 {
    font-size: 1.15rem;
    font-weight: 700;
    margin-bottom: 6px;
}
.step-content p {
    font-size: 0.95rem;
    color: var(--text-secondary);
    line-height: 1.7;
}

/* ============================================================
   CTA
   ============================================================ */
.cta-section {
    padding: 100px 24px;
    background: var(--gradient-hero);
    text-align: center;
}
.cta-content {
    max-width: 680px;
    margin: 0 auto;
}
.cta-content h2 {
    font-size: clamp(1.6rem, 3.5vw, 2.2rem);
    font-weight: 800;
    color: #fff;
    margin-bottom: 16px;
}
.cta-content p {
    font-size: 1.05rem;
    color: rgba(255,255,255,0.65);
    line-height: 1.8;
    margin-bottom: 32px;
}
.cta-buttons { margin-bottom: 24px; }
.cta-note {
    font-size: 0.85rem;
    color: rgba(255,255,255,0.4);
}

/* ============================================================
   Footer
   ============================================================ */
.footer {
    background: #0a0f1a;
    padding: 48px 24px;
    text-align: center;
}
.footer-logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    color: rgba(255,255,255,0.7);
    font-weight: 700;
    font-size: 1rem;
    margin-bottom: 12px;
}
.footer-desc {
    font-size: 0.85rem;
    color: rgba(255,255,255,0.35);
    line-height: 1.7;
    margin-bottom: 16px;
}
.footer-copy {
    font-size: 0.75rem;
    color: rgba(255,255,255,0.25);
}

/* ============================================================
   响应式
   ============================================================ */
@media (max-width: 900px) {
    .stages-container {
        flex-direction: column;
        gap: 24px;
    }
    .stages-connector {
        flex-direction: row;
        padding: 0;
        min-width: unset;
    }
    .connector-line { width: 50px; height: 2px; }
    .connector-text { writing-mode: horizontal-tb; padding: 0 10px; }
    .nav-links { gap: 16px; }
    .nav-links a { font-size: 0.8rem; }
    .hero-stats { gap: 24px; }
    .features-grid { grid-template-columns: 1fr; }
    .persona-grid { grid-template-columns: 1fr; }
}

@media (max-width: 600px) {
    .hero-title { font-size: 1.8rem; }
    .hero-subtitle { font-size: 0.95rem; }
    .hero-stats { gap: 16px; }
    .stat-number { font-size: 1.4rem; }
    .stage-card { padding: 24px 20px; }
    .step { flex-direction: column; gap: 8px; }
    .nav-links a:not(.nav-cta) { display: none; }
}