/* ============================================
   快数 Landing Page - Clean Modern SaaS
   Unified with App theme (theme.py)
   ============================================ */

/* Reset & Base */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

:root {
    /* 🎨 Unified Palette — matches theme.py */
    --color-bg: #FAFAFA;
    --color-surface: #FFFFFF;
    --color-text: #111827;
    --color-text-secondary: #4B5563;
    --color-border: #E5E7EB;

    --color-primary: #F06424;
    --color-primary-hover: #D5571E;
    --color-primary-soft: #FFF5EE;
    --color-accent: #FF8A00;

    --font-family: "Plus Jakarta Sans", -apple-system, BlinkMacSystemFont, "Inter", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    --max-width: 1080px;
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;

    /* Soft shadows — same language as theme.py */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.03);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.04), 0 2px 4px -1px rgba(0, 0, 0, 0.02);
    --shadow-lg: 0 10px 25px -5px rgba(0, 0, 0, 0.08), 0 4px 10px -4px rgba(0, 0, 0, 0.03);
    --shadow-xl: 0 20px 40px -10px rgba(0, 0, 0, 0.1);
}

html {
    scroll-behavior: smooth;
}

body {
    background-color: var(--color-bg);
    color: var(--color-text);
    font-family: var(--font-family);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
}

/* ===== Subtle Entry Animation ===== */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(8px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ===== Navbar ===== */
.nav {
    position: sticky;
    top: 0;
    background: rgba(250, 250, 250, 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-border);
    z-index: 100;
    padding: 14px 0;
}

.nav-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo {
    font-weight: 800;
    font-size: 18px;
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--color-text);
}

.logo-icon {
    font-size: 22px;
}

.nav-links {
    display: flex;
    gap: 28px;
}

.nav-links a {
    color: var(--color-text-secondary);
    text-decoration: none;
    font-weight: 500;
    font-size: 14px;
    transition: color 0.2s ease;
}

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

.nav-cta {
    background: var(--color-primary);
    color: #FFFFFF !important;
    padding: 8px 20px;
    border-radius: var(--radius-sm);
    text-decoration: none !important;
    font-weight: 600;
    font-size: 14px;
    transition: all 0.2s ease;
    box-shadow: var(--shadow-sm);
}

.nav-cta:hover {
    background: var(--color-primary-hover);
    color: #FFFFFF !important;
    box-shadow: var(--shadow-md);
    transform: translateY(-1px);
    text-decoration: none !important;
}

/* ===== Hero Section ===== */
.hero {
    padding: 100px 24px 60px;
    text-align: center;
    animation: fadeIn 0.6s cubic-bezier(0.22, 1, 0.36, 1) both;
}

.hero-container {
    max-width: 720px;
    margin: 0 auto;
}

.hero-badge {
    display: inline-block;
    background: var(--color-primary-soft);
    color: var(--color-primary);
    padding: 6px 16px;
    border: 1px solid rgba(240, 100, 36, 0.15);
    border-radius: 99px;
    font-size: 13px;
    font-weight: 600;
    margin-bottom: 28px;
}

.hero-title {
    font-size: 56px;
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 20px;
    letter-spacing: -0.03em;
    color: var(--color-text);
}

.text-gradient {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-accent) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 18px;
    color: var(--color-text-secondary);
    margin-bottom: 36px;
    line-height: 1.7;
    max-width: 540px;
    margin-left: auto;
    margin-right: auto;
}

.hero-actions {
    display: flex;
    gap: 12px;
    justify-content: center;
    margin-bottom: 16px;
}

.hero-note {
    font-size: 13px;
    color: var(--color-text-secondary);
    font-weight: 400;
    opacity: 0.8;
}

/* ===== Buttons ===== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 24px;
    border-radius: var(--radius-sm);
    font-size: 15px;
    font-weight: 600;
    text-decoration: none !important;
    transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    cursor: pointer;
    border: 1px solid transparent;
}

.btn-primary {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-accent) 100%);
    color: #FFFFFF !important;
    box-shadow: 0 4px 14px -3px rgba(240, 100, 36, 0.35);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px -4px rgba(240, 100, 36, 0.4);
    color: #FFFFFF !important;
}

.btn-secondary {
    background: var(--color-surface);
    color: var(--color-text);
    border-color: var(--color-border);
    box-shadow: var(--shadow-sm);
}

.btn-secondary:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
    background: var(--color-primary-soft);
    box-shadow: var(--shadow-md);
}

.btn-outline {
    background: transparent;
    color: var(--color-text);
    width: 100%;
    justify-content: center;
    border-color: var(--color-border);
}

.btn-outline:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
    background: var(--color-primary-soft);
}

.btn-large {
    padding: 14px 32px;
    font-size: 16px;
}

.btn-arrow {
    transition: transform 0.2s ease;
}

.btn:hover .btn-arrow {
    transform: translateX(4px);
}

/* ===== Features Section ===== */
.features {
    padding: 80px 24px;
}

.section-header {
    text-align: center;
    margin-bottom: 56px;
}

.section-header h2 {
    font-size: 32px;
    font-weight: 800;
    margin-bottom: 12px;
    letter-spacing: -0.02em;
}

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

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.feature-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 28px 24px;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: var(--shadow-sm);
    border-left: 3px solid transparent;
    display: flex;
    flex-direction: column;
}

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-left-color: var(--color-primary);
}

.feature-card.featured {
    border-left-color: var(--color-primary);
    background: var(--color-primary-soft);
}

.feature-icon {
    width: 48px;
    height: 48px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    margin-bottom: 18px;
    background: var(--color-bg);
    border: 1px solid var(--color-border);
}

.feature-card h3 {
    font-size: 17px;
    font-weight: 700;
    margin-bottom: 10px;
    letter-spacing: -0.01em;
}

.feature-card>p {
    font-size: 14px;
    color: var(--color-text-secondary);
    margin-bottom: 0;
    line-height: 1.6;
    flex: 1;
}

.feature-list {
    list-style: none;
    margin-top: 16px;
}

.feature-list li {
    font-size: 13px;
    color: var(--color-text-secondary);
    padding: 8px 0;
    border-top: 1px solid var(--color-border);
}

/* ===== Pricing Section ===== */
.pricing {
    padding: 80px 24px;
}

.pricing-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
    max-width: 780px;
    margin: 0 auto;
}

.pricing-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 40px 32px;
    position: relative;
    box-shadow: var(--shadow-sm);
    transition: all 0.3s ease;
}

.pricing-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-2px);
}

.pricing-featured {
    border-color: var(--color-primary);
    background: var(--color-primary-soft);
    box-shadow: var(--shadow-md);
}

.pricing-badge {
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
    color: white;
    padding: 4px 16px;
    border-radius: 99px;
    font-size: 12px;
    font-weight: 700;
    white-space: nowrap;
    box-shadow: 0 2px 8px rgba(240, 100, 36, 0.3);
}

.pricing-header h3 {
    font-size: 22px;
    font-weight: 800;
    margin-bottom: 8px;
}

.pricing-price {
    margin-bottom: 28px;
}

.price-original {
    font-size: 16px;
    color: var(--color-text-secondary);
    text-decoration: line-through;
    margin-bottom: -4px;
    font-weight: 400;
    opacity: 0.6;
}

.pricing-price .price {
    font-size: 44px;
    font-weight: 800;
    color: var(--color-text);
}

.pricing-price .period {
    font-size: 15px;
    color: var(--color-text-secondary);
    font-weight: 500;
}

.pricing-features {
    list-style: none;
    margin-bottom: 28px;
}

.pricing-features li {
    padding: 9px 0;
    font-size: 14px;
    color: var(--color-text-secondary);
    border-bottom: 1px solid var(--color-border);
}

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

/* ===== CTA Section ===== */
.cta {
    padding: 80px 24px;
    text-align: center;
    background: var(--color-bg);
    color: var(--color-text);
}

.cta h2 {
    font-size: 32px;
    font-weight: 800;
    margin-bottom: 12px;
    letter-spacing: -0.02em;
}

.cta p {
    font-size: 16px;
    color: var(--color-text-secondary);
    margin-bottom: 28px;
}

/* ===== Footer ===== */
.footer {
    padding: 48px 24px;
    background: var(--color-surface);
    border-top: 1px solid var(--color-border);
}

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

.footer-copy {
    color: var(--color-text-secondary);
    font-size: 13px;
    font-weight: 400;
}

.footer-links {
    display: flex;
    gap: 28px;
}

.footer-links a {
    color: var(--color-text-secondary);
    text-decoration: none;
    font-size: 13px;
    font-weight: 500;
    transition: color 0.2s ease;
}

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

/* ===== Responsive ===== */
@media (max-width: 768px) {
    .nav-links {
        display: none;
    }

    .hero {
        padding: 60px 20px 40px;
    }

    .hero-title {
        font-size: 36px;
    }

    .hero-subtitle {
        font-size: 16px;
    }

    .hero-actions {
        flex-direction: column;
        align-items: center;
    }

    .features-grid {
        grid-template-columns: 1fr;
    }

    .pricing-grid {
        grid-template-columns: 1fr;
    }

    .footer-content {
        flex-direction: column-reverse;
        gap: 20px;
        text-align: center;
    }
}