/* ===================================
   FPhone Landing Page
   ================================== */

:root {
    --blue: #007AFF;
    --blue-dark: #0055CC;
    --dark: #0a0a1a;
    --dark-surface: #12122a;
    --dark-card: #1a1a3e;
    --gray-100: #f5f5f7;
    --gray-200: #e5e5ea;
    --gray-400: #8e8e93;
    --gray-600: #48484a;
    --white: #ffffff;
    --radius: 16px;
    --radius-sm: 10px;
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--dark);
    color: var(--white);
    line-height: 1.6;
    overflow-x: hidden;
}

a {
    color: var(--blue);
    text-decoration: none;
    transition: color var(--transition);
}

a:hover {
    color: var(--blue-dark);
}

ul {
    list-style: none;
}

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

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ===================================
   Header
   ================================== */

.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    padding: 16px 0;
    transition: background var(--transition), backdrop-filter var(--transition);
}

.header.scrolled,
.header-solid {
    background: rgba(10, 10, 26, 0.92);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--white);
}

.logo-img {
    width: 36px;
    height: 36px;
    border-radius: 8px;
}

.logo-text {
    font-size: 20px;
    font-weight: 700;
    letter-spacing: -0.02em;
}

.nav-list {
    display: flex;
    gap: 32px;
}

.nav-list a {
    color: var(--gray-400);
    font-size: 14px;
    font-weight: 500;
    transition: color var(--transition);
}

.nav-list a:hover {
    color: var(--white);
}

.mobile-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}

.mobile-toggle span {
    display: block;
    width: 22px;
    height: 2px;
    background: var(--white);
    border-radius: 2px;
    transition: var(--transition);
}

/* ===================================
   Hero
   ================================== */

.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: 120px 0 80px;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    background:
        radial-gradient(ellipse 60% 50% at 20% 50%, rgba(0, 122, 255, 0.12) 0%, transparent 70%),
        radial-gradient(ellipse 40% 40% at 80% 30%, rgba(0, 122, 255, 0.06) 0%, transparent 70%);
}

.hero-content {
    position: relative;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.hero-badge {
    display: inline-block;
    padding: 6px 16px;
    background: rgba(0, 122, 255, 0.12);
    border: 1px solid rgba(0, 122, 255, 0.25);
    border-radius: 100px;
    font-size: 13px;
    font-weight: 600;
    color: var(--blue);
    letter-spacing: 0.03em;
    text-transform: uppercase;
    margin-bottom: 24px;
}

.hero h1 {
    font-size: clamp(40px, 6vw, 64px);
    font-weight: 700;
    line-height: 1.05;
    letter-spacing: -0.03em;
    margin-bottom: 24px;
}

.hero-subtitle {
    font-size: 18px;
    line-height: 1.7;
    color: var(--gray-400);
    margin-bottom: 40px;
    max-width: 520px;
}

.hero-actions {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 28px;
    border-radius: var(--radius-sm);
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    border: none;
    transition: all var(--transition);
}

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

.btn-primary:hover {
    background: var(--blue-dark);
    color: var(--white);
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(0, 122, 255, 0.3);
}

.btn-outline {
    background: transparent;
    color: var(--white);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.btn-outline:hover {
    background: rgba(255, 255, 255, 0.06);
    color: var(--white);
    border-color: rgba(255, 255, 255, 0.4);
}

/* Phone Frame */
.hero-phone {
    display: flex;
    justify-content: center;
}

.phone-frame {
    position: relative;
    width: 280px;
    border-radius: 40px;
    overflow: hidden;
    box-shadow:
        0 0 0 2px rgba(255, 255, 255, 0.08),
        0 40px 80px rgba(0, 0, 0, 0.5),
        0 0 120px rgba(0, 122, 255, 0.1);
}

.phone-frame::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 120px;
    height: 28px;
    background: #000;
    border-radius: 0 0 20px 20px;
    z-index: 2;
}

.phone-screenshot {
    width: 100%;
    border-radius: 38px;
}

/* ===================================
   Sections Common
   ================================== */

.section-header {
    text-align: center;
    margin-bottom: 64px;
}

.section-header h2 {
    font-size: clamp(28px, 4vw, 40px);
    font-weight: 700;
    letter-spacing: -0.02em;
    margin-bottom: 16px;
}

.section-header p {
    font-size: 17px;
    color: var(--gray-400);
    max-width: 560px;
    margin: 0 auto;
}

/* ===================================
   Features
   ================================== */

.features {
    padding: 120px 0;
    background: var(--dark-surface);
}

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

.feature-card {
    padding: 36px 28px;
    background: var(--dark-card);
    border-radius: var(--radius);
    border: 1px solid rgba(255, 255, 255, 0.04);
    transition: all var(--transition);
}

.feature-card:hover {
    border-color: rgba(0, 122, 255, 0.2);
    transform: translateY(-4px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
}

.feature-icon {
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0, 122, 255, 0.1);
    border-radius: 14px;
    margin-bottom: 20px;
    color: var(--blue);
}

.feature-card h3 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 10px;
}

.feature-card p {
    font-size: 14px;
    line-height: 1.7;
    color: var(--gray-400);
}

/* ===================================
   Screenshots
   ================================== */

.screenshots {
    padding: 120px 0;
}

.screenshots-carousel {
    display: flex;
    gap: 32px;
    justify-content: center;
    flex-wrap: wrap;
}

.screenshot-item {
    text-align: center;
}

.phone-frame-sm {
    width: 180px;
    border-radius: 28px;
    overflow: hidden;
    box-shadow:
        0 0 0 1px rgba(255, 255, 255, 0.06),
        0 20px 50px rgba(0, 0, 0, 0.4);
    transition: transform var(--transition);
}

.screenshot-item:hover .phone-frame-sm {
    transform: translateY(-8px);
}

.phone-frame-sm img {
    width: 100%;
    display: block;
    border-radius: 26px;
}

.screenshot-label {
    display: block;
    margin-top: 14px;
    font-size: 13px;
    font-weight: 500;
    color: var(--gray-400);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* ===================================
   Tech Specs
   ================================== */

.tech {
    padding: 120px 0;
    background: var(--dark-surface);
}

.tech-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.tech-card {
    padding: 32px 24px;
    background: var(--dark-card);
    border-radius: var(--radius);
    border: 1px solid rgba(255, 255, 255, 0.04);
}

.tech-card h4 {
    font-size: 15px;
    font-weight: 600;
    margin-bottom: 16px;
    color: var(--blue);
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.tech-card ul {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.tech-card li {
    font-size: 14px;
    color: var(--gray-400);
    padding-left: 16px;
    position: relative;
}

.tech-card li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 8px;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--blue);
    opacity: 0.5;
}

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

.download {
    padding: 120px 0;
    text-align: center;
}

.download-content h2 {
    font-size: clamp(28px, 4vw, 40px);
    font-weight: 700;
    letter-spacing: -0.02em;
    margin-bottom: 16px;
}

.download-content p {
    font-size: 17px;
    color: var(--gray-400);
    margin-bottom: 32px;
    max-width: 520px;
    margin-left: auto;
    margin-right: auto;
}

.app-store-badge {
    display: inline-block;
    transition: transform var(--transition), opacity var(--transition);
    margin-bottom: 24px;
}

.app-store-badge:hover {
    transform: scale(1.05);
    opacity: 0.9;
}

.download-note {
    font-size: 13px;
    color: var(--gray-600);
}

/* ===================================
   Footer
   ================================== */

.footer {
    padding: 60px 0 30px;
    border-top: 1px solid rgba(255, 255, 255, 0.06);
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 40px;
    margin-bottom: 40px;
}

.footer-logo {
    width: 40px;
    height: 40px;
    border-radius: 10px;
    margin-bottom: 12px;
}

.footer-brand p {
    font-size: 14px;
    color: var(--gray-400);
}

.footer-dev {
    margin-top: 4px;
}

.footer-dev a {
    color: var(--blue);
}

.footer-links h4 {
    font-size: 13px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--gray-400);
    margin-bottom: 16px;
}

.footer-links li {
    margin-bottom: 10px;
}

.footer-links a {
    font-size: 14px;
    color: var(--gray-400);
}

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

.footer-bottom {
    padding-top: 24px;
    border-top: 1px solid rgba(255, 255, 255, 0.04);
    text-align: center;
}

.footer-bottom p {
    font-size: 13px;
    color: var(--gray-600);
}

.footer-bottom a {
    color: var(--gray-400);
}

/* ===================================
   Privacy Page
   ================================== */

.privacy-page {
    padding: 140px 0 80px;
}

.privacy-content {
    max-width: 760px;
    margin: 0 auto;
}

.privacy-content h1 {
    font-size: 40px;
    font-weight: 700;
    letter-spacing: -0.02em;
    margin-bottom: 8px;
}

.privacy-updated {
    font-size: 14px;
    color: var(--gray-400);
    margin-bottom: 48px;
}

.privacy-content section {
    margin-bottom: 36px;
}

.privacy-content h2 {
    font-size: 22px;
    font-weight: 600;
    margin-bottom: 14px;
    color: var(--white);
}

.privacy-content h3 {
    font-size: 17px;
    font-weight: 600;
    margin-top: 20px;
    margin-bottom: 8px;
    color: var(--gray-200);
}

.privacy-content p {
    font-size: 15px;
    line-height: 1.75;
    color: var(--gray-400);
    margin-bottom: 12px;
}

.privacy-content ul {
    margin: 12px 0;
    padding-left: 20px;
}

.privacy-content li {
    font-size: 15px;
    line-height: 1.75;
    color: var(--gray-400);
    margin-bottom: 8px;
    padding-left: 8px;
    position: relative;
    list-style: disc;
}

.privacy-content a {
    color: var(--blue);
}

.privacy-content a:hover {
    text-decoration: underline;
}

/* ===================================
   Responsive
   ================================== */

@media (max-width: 1024px) {
    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 40px;
    }

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

    .hero-actions {
        justify-content: center;
    }

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

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

    .footer-content {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 768px) {
    .nav {
        display: none;
    }

    .mobile-toggle {
        display: flex;
    }

    .nav.open {
        display: block;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: rgba(10, 10, 26, 0.98);
        backdrop-filter: blur(20px);
        -webkit-backdrop-filter: blur(20px);
        padding: 20px 24px;
        border-bottom: 1px solid rgba(255, 255, 255, 0.06);
    }

    .nav.open .nav-list {
        flex-direction: column;
        gap: 16px;
    }

    .hero {
        padding: 100px 0 60px;
        min-height: auto;
    }

    .phone-frame {
        width: 220px;
    }

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

    .screenshots-carousel {
        gap: 20px;
    }

    .phone-frame-sm {
        width: 140px;
    }

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

    .footer-content {
        grid-template-columns: 1fr;
        gap: 32px;
    }

    .privacy-content h1 {
        font-size: 30px;
    }
}

@media (max-width: 480px) {
    .phone-frame-sm {
        width: 120px;
    }

    .screenshots-carousel {
        gap: 12px;
    }

    .hero h1 {
        font-size: 34px;
    }
}