/**
 * Landing Page Styles
 * Apple-inspired, SEO-optimized marketing page
 * Imports shared design tokens from variables.css
 */

@import url('./variables.css');

/* ============================================
   RESET & BASE
   ============================================ */

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'SF Pro Text', 'Helvetica Neue', 'Helvetica', 'Arial', sans-serif;
    background: var(--bg-canvas);
    color: var(--text-primary);
    line-height: 1.5;
    font-size: var(--font-md);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    letter-spacing: -0.022em;
    overflow-x: hidden;
}

::-webkit-scrollbar {
    width: 6px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: rgba(0, 0, 0, 0.15);
    border-radius: 9999px;
}

::selection {
    background: rgba(0, 122, 255, 0.15);
    color: var(--text-primary);
}

h1, h2, h3, h4, h5, h6 {
    color: var(--text-primary);
    font-weight: var(--font-bold);
    letter-spacing: -0.03em;
    line-height: 1.15;
}

a {
    color: var(--brand-primary);
    text-decoration: none;
}

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

/* Container */
.container {
    max-width: 1120px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ============================================
   BUTTONS (subset of base.css)
   ============================================ */

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 24px;
    border-radius: var(--radius-full);
    font-size: var(--font-sm);
    font-weight: var(--font-semibold);
    cursor: pointer;
    border: none;
    transition: all var(--transition-fast);
    text-decoration: none;
    white-space: nowrap;
    letter-spacing: -0.01em;
    position: relative;
    overflow: hidden;
}

.btn::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, rgba(255,255,255,0.12) 0%, rgba(255,255,255,0) 50%);
    pointer-events: none;
    border-radius: inherit;
}

.btn-primary,
.btn:not(.btn-secondary):not(.btn-nav) {
    background: var(--brand-primary);
    color: #fff;
}

.btn-primary:hover,
.btn:not(.btn-secondary):not(.btn-nav):hover {
    background: var(--accent-hover);
    box-shadow: 0 4px 16px rgba(0, 122, 255, 0.3);
    transform: translateY(-1px);
}

.btn-secondary {
    background: var(--bg-secondary);
    color: var(--text-primary);
    border: 1px solid var(--border);
    box-shadow: var(--shadow-xs);
}

.btn-secondary::after {
    background: linear-gradient(180deg, rgba(255,255,255,0.5) 0%, rgba(255,255,255,0) 60%);
}

.btn-secondary:hover {
    background: var(--bg-tertiary);
    border-color: var(--border-strong);
    box-shadow: var(--shadow-sm);
    transform: translateY(-1px);
}

.btn:active {
    transform: translateY(0) scale(0.98);
}

/* ============================================
   NAVIGATION
   ============================================ */

.landing-nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 52px;
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: saturate(180%) blur(20px);
    -webkit-backdrop-filter: saturate(180%) blur(20px);
    border-bottom: 0.5px solid rgba(0, 0, 0, 0.1);
    z-index: 100;
    transition: background var(--transition-normal);
}

[data-theme="dark"] .landing-nav {
    background: rgba(28, 28, 30, 0.8);
    border-bottom-color: rgba(255, 255, 255, 0.08);
}

@media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) .landing-nav {
        background: rgba(28, 28, 30, 0.8);
        border-bottom-color: rgba(255, 255, 255, 0.08);
    }
}

.nav-container {
    max-width: 1120px;
    margin: 0 auto;
    padding: 0 24px;
    height: 100%;
    display: flex;
    align-items: center;
    gap: 32px;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: var(--font-lg);
    font-weight: var(--font-bold);
    color: var(--text-primary);
    text-decoration: none;
    letter-spacing: -0.03em;
    flex-shrink: 0;
}

.nav-logo svg {
    width: 26px;
    height: 26px;
    flex-shrink: 0;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 4px;
    margin-left: auto;
}

.nav-links a {
    color: var(--text-secondary);
    padding: 6px 14px;
    border-radius: var(--radius-full);
    font-size: var(--font-sm);
    font-weight: var(--font-medium);
    transition: all var(--transition-fast);
    text-decoration: none;
}

.nav-links a:hover {
    color: var(--text-primary);
    background: var(--accent-light);
}

.btn-nav {
    background: var(--brand-primary) !important;
    color: #fff !important;
    padding: 6px 18px !important;
    font-size: var(--font-sm) !important;
    margin-left: 8px;
}

.btn-nav:hover {
    background: var(--accent-hover) !important;
    box-shadow: 0 2px 8px rgba(0, 122, 255, 0.25);
}

.nav-right {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-left: 8px;
}

.lang-switch {
    font-size: var(--font-xs);
    font-weight: var(--font-semibold);
    color: var(--text-secondary);
    padding: 4px 10px;
    border-radius: var(--radius-full);
    background: var(--bg-primary);
    text-decoration: none;
    transition: all var(--transition-fast);
    letter-spacing: 0.03em;
}

.lang-switch:hover {
    color: var(--brand-primary);
    background: var(--accent-light);
}

.btn-theme {
    background: none;
    border: none;
    cursor: pointer;
    font-size: 16px;
    padding: 4px 8px;
    border-radius: var(--radius-full);
    transition: all var(--transition-fast);
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
}

.btn-theme:hover {
    background: var(--accent-light);
    color: var(--text-primary);
}

.nav-mobile-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
    color: var(--text-primary);
}

/* ============================================
   HERO
   ============================================ */

.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 120px 24px 80px;
    background: var(--bg-canvas);
    position: relative;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: var(--font-xs);
    font-weight: var(--font-semibold);
    color: var(--brand-primary);
    background: var(--accent-light);
    padding: 6px 16px;
    border-radius: var(--radius-full);
    margin-bottom: 24px;
    letter-spacing: 0.01em;
}

.hero h1 {
    font-size: clamp(2.5rem, 6vw, 4.25rem);
    font-weight: 700;
    letter-spacing: -0.04em;
    line-height: 1.08;
    color: var(--text-primary);
    margin-bottom: 20px;
}

.gradient-text {
    background: var(--gradient-brand);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: clamp(1rem, 2vw, 1.2rem);
    color: var(--text-secondary);
    max-width: 580px;
    margin: 0 auto 32px;
    line-height: 1.55;
    letter-spacing: -0.01em;
}

.hero-actions {
    display: flex;
    gap: 12px;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 40px;
}

.btn-hero {
    padding: 14px 32px;
    font-size: var(--font-md);
    border-radius: var(--radius-full);
}

.hero-formats {
    display: flex;
    gap: 8px;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 16px;
}

.format-tag {
    font-size: 10px;
    font-weight: var(--font-semibold);
    letter-spacing: 0.04em;
    text-transform: uppercase;
    color: var(--text-muted);
    background: var(--bg-secondary);
    padding: 4px 12px;
    border-radius: var(--radius-full);
    border: 0.5px solid rgba(0, 0, 0, 0.06);
}

.hero-tech {
    font-size: var(--font-xs);
    color: var(--text-muted);
    margin-top: 0;
}

/* ============================================
   SECTIONS (shared)
   ============================================ */

section {
    padding: 100px 0;
}

section:nth-child(even) {
    background: var(--bg-secondary);
}

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

.section-header h2 {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    margin-bottom: 12px;
    letter-spacing: -0.035em;
}

.section-header p {
    font-size: var(--font-lg);
    color: var(--text-secondary);
    max-width: 520px;
    margin: 0 auto;
}

/* ============================================
   FEATURES
   ============================================ */

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

.feature-card {
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-card);
    padding: 32px 28px;
    border: 0.5px solid rgba(0, 0, 0, 0.06);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

section:nth-child(even) .feature-card {
    background: var(--bg-canvas);
}

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

.feature-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-md);
    background: var(--accent-light);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
    color: var(--brand-primary);
}

.feature-icon svg {
    width: 24px;
    height: 24px;
}

.feature-card h3 {
    font-size: var(--font-lg);
    font-weight: var(--font-semibold);
    margin-bottom: 8px;
    letter-spacing: -0.02em;
}

.feature-card p {
    font-size: var(--font-sm);
    color: var(--text-secondary);
    line-height: 1.55;
}

/* ============================================
   HOW IT WORKS
   ============================================ */

.steps {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 48px;
    text-align: center;
}

.step-number {
    width: 56px;
    height: 56px;
    border-radius: var(--radius-xl);
    background: var(--gradient-brand);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-2xl);
    font-weight: var(--font-bold);
    margin: 0 auto 20px;
    box-shadow: 0 4px 16px rgba(0, 122, 255, 0.25);
}

.step h3 {
    font-size: var(--font-lg);
    font-weight: var(--font-semibold);
    margin-bottom: 8px;
}

.step p {
    font-size: var(--font-sm);
    color: var(--text-secondary);
    line-height: 1.55;
    max-width: 300px;
    margin: 0 auto;
}

/* ============================================
   PRIVACY
   ============================================ */

.privacy-card {
    background: var(--bg-secondary);
    border-radius: var(--radius-xl);
    padding: 56px 48px;
    text-align: center;
    box-shadow: var(--shadow-md);
    border: 0.5px solid rgba(0, 0, 0, 0.06);
    max-width: 800px;
    margin: 0 auto;
}

section:nth-child(even) .privacy-card {
    background: var(--bg-canvas);
}

.privacy-icon {
    width: 72px;
    height: 72px;
    border-radius: var(--radius-xl);
    background: rgba(52, 199, 89, 0.08);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 24px;
    color: var(--success);
}

.privacy-icon svg {
    width: 36px;
    height: 36px;
}

.privacy-card h2 {
    font-size: clamp(1.5rem, 3vw, 2rem);
    margin-bottom: 12px;
}

.privacy-subtitle {
    font-size: var(--font-md);
    color: var(--text-secondary);
    max-width: 520px;
    margin: 0 auto 32px;
    line-height: 1.55;
}

.privacy-features {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
    text-align: left;
}

.privacy-item {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: var(--font-sm);
    font-weight: var(--font-medium);
    color: var(--text-primary);
}

.privacy-item svg {
    width: 18px;
    height: 18px;
    color: var(--success);
    flex-shrink: 0;
}

/* ============================================
   FORMATS
   ============================================ */

.formats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}

.format-card {
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-card);
    padding: 28px 24px;
    text-align: center;
    border: 0.5px solid rgba(0, 0, 0, 0.06);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

section:nth-child(even) .format-card {
    background: var(--bg-canvas);
}

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

.format-card-ext {
    font-family: 'SF Mono', 'Menlo', 'Monaco', monospace;
    font-size: var(--font-lg);
    font-weight: var(--font-bold);
    color: var(--brand-primary);
    margin-bottom: 12px;
    letter-spacing: 0;
}

.format-card h4 {
    font-size: var(--font-md);
    font-weight: var(--font-semibold);
    margin-bottom: 6px;
}

.format-card p {
    font-size: var(--font-xs);
    color: var(--text-secondary);
    line-height: 1.5;
}

/* ============================================
   FAQ
   ============================================ */

.faq-list {
    max-width: 720px;
    margin: 0 auto;
}

.faq-item {
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    border: 0.5px solid rgba(0, 0, 0, 0.06);
    margin-bottom: 10px;
    overflow: hidden;
    transition: all var(--transition-fast);
}

section:nth-child(even) .faq-item {
    background: var(--bg-canvas);
}

.faq-item summary {
    padding: 18px 24px;
    cursor: pointer;
    font-weight: var(--font-semibold);
    font-size: var(--font-md);
    color: var(--text-primary);
    list-style: none;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    transition: color var(--transition-fast);
}

.faq-item summary::marker,
.faq-item summary::-webkit-details-marker {
    display: none;
}

.faq-item summary::after {
    content: '+';
    font-size: 1.25rem;
    font-weight: var(--font-normal);
    color: var(--text-muted);
    transition: transform var(--transition-fast);
    flex-shrink: 0;
}

.faq-item[open] summary::after {
    content: '\2212';
}

.faq-item[open] summary {
    border-bottom: 1px solid var(--border);
}

.faq-item .faq-answer {
    padding: 16px 24px 20px;
    font-size: var(--font-sm);
    color: var(--text-secondary);
    line-height: 1.6;
}

/* ============================================
   CTA
   ============================================ */

.cta {
    text-align: center;
    background: var(--bg-canvas);
}

.cta h2 {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    margin-bottom: 12px;
}

.cta p {
    font-size: var(--font-lg);
    color: var(--text-secondary);
    margin-bottom: 32px;
}

/* ============================================
   FOOTER
   ============================================ */

.landing-footer {
    background: var(--bg-secondary);
    border-top: 0.5px solid rgba(0, 0, 0, 0.08);
    padding: 56px 0 0;
}

.footer-content {
    display: flex;
    gap: 64px;
    margin-bottom: 40px;
}

.footer-brand {
    flex: 1;
    max-width: 300px;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: var(--font-lg);
    font-weight: var(--font-bold);
    color: var(--text-primary);
    margin-bottom: 12px;
    letter-spacing: -0.03em;
}

.footer-logo svg {
    width: 24px;
    height: 24px;
}

.footer-brand > p {
    font-size: var(--font-sm);
    color: var(--text-secondary);
    line-height: 1.5;
}

.footer-links {
    display: flex;
    gap: 56px;
}

.footer-col h4 {
    font-size: var(--font-xs);
    font-weight: var(--font-semibold);
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--text-secondary);
    margin-bottom: 16px;
}

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

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

.footer-bottom {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 20px 0;
    border-top: 0.5px solid rgba(0, 0, 0, 0.06);
    font-size: var(--font-xs);
    color: var(--text-muted);
}

.footer-bottom a {
    color: var(--text-secondary);
    text-decoration: none;
}

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

/* ============================================
   SCROLL REVEAL
   ============================================ */

.reveal {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.6s cubic-bezier(0.4, 0, 0.2, 1), transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

.reveal.visible {
    opacity: 1;
    transform: translateY(0);
}

.reveal:nth-child(2) { transition-delay: 0.06s; }
.reveal:nth-child(3) { transition-delay: 0.12s; }
.reveal:nth-child(4) { transition-delay: 0.18s; }
.reveal:nth-child(5) { transition-delay: 0.24s; }
.reveal:nth-child(6) { transition-delay: 0.30s; }

/* ============================================
   RESPONSIVE
   ============================================ */

@media (max-width: 1024px) {
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .privacy-features {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    section {
        padding: 72px 0;
    }

    .hero {
        padding: 100px 20px 64px;
        min-height: auto;
    }

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

    .steps {
        grid-template-columns: 1fr;
        gap: 36px;
    }

    .formats-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .privacy-card {
        padding: 36px 24px;
    }

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

    .footer-content {
        flex-direction: column;
        gap: 36px;
    }

    .footer-links {
        gap: 36px;
    }

    .footer-bottom {
        flex-direction: column;
        gap: 8px;
        text-align: center;
    }

    /* Mobile Nav */
    .nav-links {
        display: none;
        position: absolute;
        top: 52px;
        left: 0;
        right: 0;
        background: var(--bg-secondary);
        flex-direction: column;
        padding: 12px 16px;
        border-bottom: 0.5px solid rgba(0, 0, 0, 0.1);
        box-shadow: var(--shadow-lg);
        gap: 4px;
    }

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

    .nav-links a {
        padding: 10px 16px;
        border-radius: var(--radius-md);
    }

    .btn-nav {
        text-align: center;
        justify-content: center;
    }

    .nav-mobile-toggle {
        display: flex;
    }

    .section-header {
        margin-bottom: 40px;
    }
}

@media (max-width: 480px) {
    .hero h1 {
        font-size: 2rem;
    }

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

    .footer-links {
        flex-direction: column;
        gap: 24px;
    }

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