:root {
    --color-primary: #007AFF;
    --color-primary-rgb: 0, 122, 255;
    --color-primary-dark: #0056CC;
    --color-teal: #00C7BE;
    --color-surface-rgb: 255, 255, 255;
    --color-accent: #34C759;
    --color-bg: #F5F7FA;
    --color-surface: #FFFFFF;
    --color-text: #1C1C1E;
    --color-text-secondary: #636366;
    --color-text-tertiary: #8E8E93;
    --color-border: rgba(0, 0, 0, 0.08);
    --color-shadow: rgba(0, 0, 0, 0.06);
    --color-shadow-lg: rgba(0, 0, 0, 0.12);
    --gradient-primary: linear-gradient(135deg, #007AFF 0%, #00C7BE 100%);
    --gradient-hero: linear-gradient(160deg, #F0F6FF 0%, #E8F8F7 40%, #F5F7FA 100%);
    --radius-sm: 12px;
    --radius-md: 16px;
    --radius-lg: 24px;
    --radius-xl: 32px;
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --transition-fast: 0.2s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;
    --container-max: 1200px;
    --header-height: 72px;
}

@media (prefers-color-scheme: dark) {
    :root {
        --color-bg: #0A0A0A;
        --color-surface: #1C1C1E;
        --color-surface-rgb: 28, 28, 30;
        --color-text: #F2F2F7;
        --color-text-secondary: #98989D;
        --color-text-tertiary: #636366;
        --color-border: rgba(255, 255, 255, 0.08);
        --color-shadow: rgba(0, 0, 0, 0.3);
        --color-shadow-lg: rgba(0, 0, 0, 0.5);
        --gradient-hero: linear-gradient(160deg, #0C1628 0%, #0A1F1E 40%, #0A0A0A 100%);
    }
}

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

html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

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

:focus-visible {
    outline: 3px solid var(--color-primary);
    outline-offset: 2px;
    border-radius: 4px;
}

:focus:not(:focus-visible) {
    outline: none;
}

.container {
    width: 100%;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 24px;
}

@media (min-width: 768px) {
    .container {
        padding: 0 40px;
    }
}

/* Header */
.header {
    position: sticky;
    top: 0;
    z-index: 1000;
    height: var(--header-height);
    display: flex;
    align-items: center;
    transition: background-color var(--transition-base), box-shadow var(--transition-base);
}

.header.scrolled {
    background-color: rgba(var(--color-surface-rgb, 255, 255, 255), 0.85);
    backdrop-filter: saturate(180%) blur(20px);
    -webkit-backdrop-filter: saturate(180%) blur(20px);
    box-shadow: 0 1px 0 var(--color-border);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
}

.logo {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
    color: var(--color-text);
    font-weight: 700;
    font-size: 1.15rem;
    letter-spacing: -0.02em;
}

.logo-icon {
    display: flex;
    flex-shrink: 0;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 2px 8px rgba(var(--color-primary-rgb), 0.25);
}

.logo-text {
    white-space: nowrap;
}

/* Nav */
.nav {
    display: flex;
    align-items: center;
}

.hamburger {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    width: 44px;
    height: 44px;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0;
    z-index: 1001;
    border-radius: 10px;
    transition: background-color var(--transition-fast);
}

.hamburger:hover {
    background-color: var(--color-bg);
}

.hamburger-line {
    display: block;
    width: 22px;
    height: 2px;
    background-color: var(--color-text);
    border-radius: 2px;
    transition: transform var(--transition-base), opacity var(--transition-base);
    transform-origin: center;
}

.hamburger[aria-expanded="true"] .hamburger-line:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}

.hamburger[aria-expanded="true"] .hamburger-line:nth-child(2) {
    opacity: 0;
}

.hamburger[aria-expanded="true"] .hamburger-line:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

.nav-menu {
    position: fixed;
    top: 0;
    right: 0;
    width: 280px;
    height: 100vh;
    background-color: var(--color-surface);
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0;
    padding: 100px 32px 32px;
    transform: translateX(100%);
    transition: transform var(--transition-base), box-shadow var(--transition-base);
    box-shadow: -8px 0 32px var(--color-shadow);
    z-index: 999;
}

.nav-menu.open {
    transform: translateX(0);
}

.nav-link {
    display: block;
    padding: 14px 0;
    text-decoration: none;
    color: var(--color-text);
    font-weight: 500;
    font-size: 1.05rem;
    border-bottom: 1px solid var(--color-border);
    transition: color var(--transition-fast), transform var(--transition-fast);
}

.nav-link:hover {
    color: var(--color-primary);
    transform: translateX(4px);
}

.nav-link--cta {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    margin-top: 16px;
    padding: 14px 24px;
    background: var(--gradient-primary);
    color: #FFFFFF;
    border-radius: 100px;
    font-weight: 600;
    border: none;
    box-shadow: 0 4px 14px rgba(var(--color-primary-rgb), 0.35);
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.nav-link--cta:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(var(--color-primary-rgb), 0.45);
    color: #FFFFFF;
}

.nav-overlay {
    position: fixed;
    inset: 0;
    background-color: rgba(0, 0, 0, 0.4);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition-base), visibility var(--transition-base);
    z-index: 998;
}

.nav-overlay.active {
    opacity: 1;
    visibility: visible;
}

@media (min-width: 768px) {
    .hamburger {
        display: none;
    }

    .nav-menu {
        position: static;
        width: auto;
        height: auto;
        flex-direction: row;
        align-items: center;
        gap: 8px;
        padding: 0;
        transform: none;
        background: none;
        box-shadow: none;
        transition: none;
    }

    .nav-link {
        padding: 10px 18px;
        border-bottom: none;
        border-radius: 100px;
        font-size: 0.95rem;
        font-weight: 500;
    }

    .nav-link:hover {
        background-color: var(--color-bg);
        transform: none;
    }

    .nav-link--cta {
        margin-top: 0;
        padding: 10px 22px;
    }

    .nav-link--cta:hover {
        transform: translateY(-1px);
    }

    .nav-overlay {
        display: none;
    }
}

/* Hero */
.hero {
    position: relative;
    padding: 48px 0 80px;
    background: var(--gradient-hero);
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -200px;
    right: -200px;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(var(--color-primary-rgb), 0.08) 0%, transparent 70%);
    pointer-events: none;
}

.hero::after {
    content: '';
    position: absolute;
    bottom: -100px;
    left: -100px;
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(0, 199, 190, 0.08) 0%, transparent 70%);
    pointer-events: none;
}

.hero-inner {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 48px;
    position: relative;
    z-index: 1;
}

.hero-content {
    text-align: center;
    max-width: 600px;
}

.hero-badge {
    margin-bottom: 24px;
}

.badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 18px;
    background-color: rgba(var(--color-primary-rgb), 0.1);
    color: var(--color-primary);
    font-size: 0.85rem;
    font-weight: 600;
    border-radius: 100px;
    letter-spacing: 0.02em;
}

.hero-title {
    font-size: clamp(2.5rem, 6vw, 4rem);
    font-weight: 800;
    letter-spacing: -0.04em;
    line-height: 1.1;
    margin-bottom: 16px;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-tagline {
    font-size: clamp(1.15rem, 2.5vw, 1.5rem);
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: 12px;
    line-height: 1.35;
}

.hero-subtitle {
    font-size: clamp(0.95rem, 2vw, 1.1rem);
    color: var(--color-text-secondary);
    margin-bottom: 32px;
    line-height: 1.6;
    max-width: 480px;
    margin-left: auto;
    margin-right: auto;
}

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

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 16px 32px;
    font-size: 1rem;
    font-weight: 600;
    font-family: inherit;
    text-decoration: none;
    border: none;
    border-radius: 100px;
    cursor: pointer;
    transition: transform var(--transition-fast), box-shadow var(--transition-fast), background-color var(--transition-fast);
}

.btn--primary {
    background: var(--gradient-primary);
    color: #FFFFFF;
    box-shadow: 0 4px 16px rgba(var(--color-primary-rgb), 0.35);
}

.btn--primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(var(--color-primary-rgb), 0.45);
}

.btn-icon {
    flex-shrink: 0;
}

/* Phone Mockup */
.hero-visual {
    display: flex;
    justify-content: center;
}

.phone-mockup {
    perspective: 1200px;
}

.phone-frame {
    width: 280px;
    height: 560px;
    background: linear-gradient(180deg, #1C1C1E 0%, #2C2C2E 100%);
    border-radius: 40px;
    padding: 10px;
    box-shadow:
        0 0 0 2px #3A3A3C,
        0 32px 64px rgba(0, 0, 0, 0.3),
        0 12px 24px rgba(0, 0, 0, 0.2);
    position: relative;
    transform-style: preserve-3d;
    animation: phoneFloat 6s ease-in-out infinite;
}

@keyframes phoneFloat {
    0%, 100% {
        transform: translateY(0) rotateY(-8deg) rotateX(4deg);
    }
    50% {
        transform: translateY(-16px) rotateY(-8deg) rotateX(4deg);
    }
}

.phone-notch {
    position: absolute;
    top: 10px;
    left: 50%;
    transform: translateX(-50%);
    width: 100px;
    height: 26px;
    background-color: #1C1C1E;
    border-radius: 0 0 16px 16px;
    z-index: 2;
}

.phone-screen {
    width: 100%;
    height: 100%;
    background-color: #000000;
    border-radius: 32px;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.screen-header {
    padding: 44px 20px 12px;
    text-align: center;
}

.screen-title {
    color: #FFFFFF;
    font-size: 0.9rem;
    font-weight: 700;
    letter-spacing: 0.02em;
}

.screen-content {
    flex: 1;
    padding: 8px 16px 20px;
    display: flex;
    flex-direction: column;
    gap: 12px;
    overflow: hidden;
}

.stat-card {
    background: linear-gradient(135deg, #007AFF 0%, #00C7BE 100%);
    border-radius: 16px;
    padding: 16px;
    text-align: center;
}

.stat-value {
    color: #FFFFFF;
    font-size: 1.6rem;
    font-weight: 800;
    letter-spacing: -0.03em;
}

.stat-label {
    color: rgba(255, 255, 255, 0.85);
    font-size: 0.75rem;
    margin-top: 2px;
}

.scan-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.scan-item {
    display: flex;
    align-items: center;
    gap: 10px;
    background-color: #1C1C1E;
    padding: 10px 14px;
    border-radius: 12px;
}

.scan-icon {
    font-size: 1.1rem;
    flex-shrink: 0;
}

.scan-text {
    flex: 1;
    color: #FFFFFF;
    font-size: 0.8rem;
    font-weight: 500;
}

.scan-badge {
    background-color: rgba(255, 255, 255, 0.12);
    color: #FFFFFF;
    font-size: 0.75rem;
    font-weight: 600;
    padding: 3px 10px;
    border-radius: 100px;
    min-width: 32px;
    text-align: center;
}

.screen-cta {
    margin-top: auto;
    background: linear-gradient(135deg, #007AFF 0%, #00C7BE 100%);
    color: #FFFFFF;
    text-align: center;
    padding: 14px;
    border-radius: 14px;
    font-size: 0.85rem;
    font-weight: 700;
    letter-spacing: 0.02em;
}

.hero-scroll-indicator {
    position: absolute;
    bottom: 24px;
    left: 50%;
    transform: translateX(-50%);
    display: none;
}

.scroll-mouse {
    width: 22px;
    height: 34px;
    border: 2px solid var(--color-text-tertiary);
    border-radius: 12px;
    position: relative;
}

.scroll-wheel {
    width: 4px;
    height: 6px;
    background-color: var(--color-text-tertiary);
    border-radius: 2px;
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    animation: scrollWheel 2s ease-in-out infinite;
}

@keyframes scrollWheel {
    0%, 100% {
        opacity: 1;
        transform: translateX(-50%) translateY(0);
    }
    50% {
        opacity: 0.3;
        transform: translateX(-50%) translateY(8px);
    }
}

@media (min-width: 1024px) {
    .hero {
        padding: 64px 0 100px;
    }

    .hero-inner {
        flex-direction: row;
        justify-content: space-between;
        align-items: center;
        gap: 64px;
    }

    .hero-content {
        text-align: left;
        flex: 1;
    }

    .hero-subtitle {
        margin-left: 0;
        margin-right: 0;
    }

    .hero-cta {
        justify-content: flex-start;
    }

    .hero-visual {
        flex-shrink: 0;
    }

    .phone-frame {
        width: 300px;
        height: 600px;
    }

    .hero-scroll-indicator {
        display: block;
    }
}

/* Sections Common */
.section-header {
    text-align: center;
    margin-bottom: 56px;
}

.section-title {
    font-size: clamp(1.8rem, 4vw, 2.6rem);
    font-weight: 800;
    letter-spacing: -0.03em;
    margin-bottom: 12px;
    color: var(--color-text);
}

.section-subtitle {
    font-size: clamp(0.95rem, 2vw, 1.1rem);
    color: var(--color-text-secondary);
    max-width: 520px;
    margin: 0 auto;
    line-height: 1.6;
}

/* Features */
.features {
    padding: 80px 0;
}

.features-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 20px;
}

.feature-card {
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 32px;
    transition: transform var(--transition-base), box-shadow var(--transition-base);
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--gradient-primary);
    opacity: 0;
    transition: opacity var(--transition-base);
}

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 16px 40px var(--color-shadow-lg);
}

.feature-card:hover::before {
    opacity: 1;
}

.feature-icon {
    font-size: 2.2rem;
    line-height: 1;
    margin-bottom: 16px;
    display: inline-block;
    padding: 12px;
    background-color: rgba(var(--color-primary-rgb), 0.08);
    border-radius: var(--radius-md);
}

.feature-title {
    font-size: 1.15rem;
    font-weight: 700;
    margin-bottom: 8px;
    color: var(--color-text);
    letter-spacing: -0.01em;
}

.feature-desc {
    font-size: 0.95rem;
    color: var(--color-text-secondary);
    line-height: 1.55;
}

@media (min-width: 768px) {
    .features {
        padding: 100px 0;
    }

    .features-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 24px;
    }
}

@media (min-width: 1024px) {
    .features-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: 24px;
    }
}

/* How It Works */
.how-it-works {
    padding: 80px 0;
    background-color: var(--color-surface);
    border-top: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
}

.steps {
    display: grid;
    grid-template-columns: 1fr;
    gap: 32px;
    max-width: 900px;
    margin: 0 auto;
}

.step {
    text-align: center;
    padding: 32px 24px;
    position: relative;
}

.step-number {
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    background: var(--gradient-primary);
    color: #FFFFFF;
    font-size: 1.4rem;
    font-weight: 800;
    border-radius: 50%;
    box-shadow: 0 6px 20px rgba(0, 122, 255, 0.3);
}

.step-title {
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: 10px;
    color: var(--color-text);
}

.step-desc {
    font-size: 0.95rem;
    color: var(--color-text-secondary);
    line-height: 1.6;
    max-width: 320px;
    margin: 0 auto;
}

@media (min-width: 768px) {
    .how-it-works {
        padding: 100px 0;
    }

    .steps {
        grid-template-columns: repeat(3, 1fr);
        gap: 24px;
    }

    .step:not(:last-child)::after {
        content: '';
        position: absolute;
        top: 56px;
        right: -24px;
        width: 48px;
        height: 2px;
        background: linear-gradient(90deg, var(--color-border), var(--color-primary), var(--color-border));
        opacity: 0.5;
    }
}

/* Stats */
.stats {
    padding: 56px 0;
    background: var(--gradient-primary);
    color: #FFFFFF;
}

.stats-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 32px;
    text-align: center;
}

.stat-item {
    padding: 8px;
}

.stat-number {
    font-size: clamp(1.5rem, 3.5vw, 2.2rem);
    font-weight: 800;
    letter-spacing: -0.02em;
    margin-bottom: 6px;
}

.stat-desc {
    font-size: 0.95rem;
    opacity: 0.9;
    font-weight: 500;
}

@media (min-width: 768px) {
    .stats-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: 24px;
    }
}

/* Download */
.download {
    padding: 80px 0;
    text-align: center;
}

.download-inner {
    max-width: 640px;
    margin: 0 auto;
    padding: 48px 32px;
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    box-shadow: 0 24px 64px var(--color-shadow);
}

.download-title {
    font-size: clamp(1.6rem, 4vw, 2.2rem);
    font-weight: 800;
    margin-bottom: 12px;
    letter-spacing: -0.03em;
    color: var(--color-text);
}

.download-subtitle {
    font-size: 1rem;
    color: var(--color-text-secondary);
    margin-bottom: 32px;
    line-height: 1.6;
}

.download-badges {
    display: flex;
    justify-content: center;
    gap: 16px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}

.app-store-btn {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    padding: 14px 28px;
    background-color: var(--color-text);
    color: var(--color-surface);
    text-decoration: none;
    border-radius: 14px;
    font-weight: 600;
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
    box-shadow: 0 4px 16px var(--color-shadow-lg);
}

.app-store-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px var(--color-shadow-lg);
}

.app-store-icon {
    flex-shrink: 0;
}

.app-store-text {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    line-height: 1.15;
}

.app-store-small {
    font-size: 0.7rem;
    opacity: 0.85;
    font-weight: 500;
}

.app-store-large {
    font-size: 1.05rem;
    font-weight: 700;
}

.download-note {
    font-size: 0.85rem;
    color: var(--color-text-tertiary);
}

@media (min-width: 768px) {
    .download {
        padding: 100px 0;
    }

    .download-inner {
        padding: 64px 48px;
    }
}

/* Footer */
.footer {
    padding: 48px 0 32px;
    border-top: 1px solid var(--color-border);
    text-align: center;
}

.footer-inner {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
}

.footer-brand {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-weight: 700;
    font-size: 1.05rem;
    color: var(--color-text);
}

.footer-logo-icon {
    display: flex;
    flex-shrink: 0;
    border-radius: 8px;
    overflow: hidden;
}

.footer-tagline {
    font-size: 0.9rem;
    color: var(--color-text-secondary);
}

.heart {
    color: #FF2D55;
}

.footer-links {
    display: flex;
    gap: 24px;
    flex-wrap: wrap;
    justify-content: center;
}

.footer-link {
    font-size: 0.85rem;
    color: var(--color-text-secondary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

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

.footer-copyright {
    font-size: 0.8rem;
    color: var(--color-text-tertiary);
    margin-top: 8px;
}

/* Scroll Reveal Animations */
.fade-up {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-up.visible {
    opacity: 1;
    transform: translateY(0);
}

/* Stagger delays for children */
.fade-up:nth-child(1) { transition-delay: 0s; }
.fade-up:nth-child(2) { transition-delay: 0.06s; }
.fade-up:nth-child(3) { transition-delay: 0.12s; }
.fade-up:nth-child(4) { transition-delay: 0.18s; }
.fade-up:nth-child(5) { transition-delay: 0.24s; }
.fade-up:nth-child(6) { transition-delay: 0.30s; }
.fade-up:nth-child(7) { transition-delay: 0.36s; }
.fade-up:nth-child(8) { transition-delay: 0.42s; }
.fade-up:nth-child(9) { transition-delay: 0.48s; }