/* ============================================
   iPhone Landing — Design System
   Inspired by Apple's design philosophy
   with a distinctive purple accent identity
   ============================================ */

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

:root {
    /* Colors */
    --color-bg: #f5f5f7;
    --color-surface: #ffffff;
    --color-accent: #5e5ce6;
    --color-accent-hover: #4b49d1;
    --color-accent-light: rgba(94, 92, 230, 0.12);
    --color-text: #1d1d1f;
    --color-text-secondary: #86868b;
    --color-text-tertiary: #aeaeb2;
    --color-border: #d2d2d7;
    --color-dark-bg: #0a0a0a;
    --color-dark-surface: #1d1d1f;
    --color-dark-text: #f5f5f7;
    --color-dark-text-secondary: #a1a1a6;
    --color-success: #30d158;
    --color-gradient-start: #5e5ce6;
    --color-gradient-end: #007aff;

    /* Typography */
    --font-display: 'Space Grotesk', sans-serif;
    --font-body: 'Inter', -apple-system, sans-serif;

    /* Spacing */
    --section-padding: 120px 0;
    --container-width: 1100px;
    --container-padding: 0 24px;

    /* Radius */
    --radius-sm: 8px;
    --radius-md: 16px;
    --radius-lg: 24px;
    --radius-xl: 32px;
    --radius-full: 50%;

    /* Transitions */
    --transition: 0.3s cubic-bezier(0.25, 0.1, 0.25, 1);
    --transition-slow: 0.5s cubic-bezier(0.25, 0.1, 0.25, 1);
}

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-body);
    font-size: 16px;
    line-height: 1.6;
    color: var(--color-text);
    background: var(--color-bg);
    overflow-x: hidden;
}

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

a {
    color: inherit;
    text-decoration: none;
}

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

/* --- Header --- */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    background: rgba(245, 245, 247, 0.85);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(0, 0, 0, 0.06);
    transition: var(--transition);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 52px;
    padding: 0 24px;
    max-width: var(--container-width);
    margin: 0 auto;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-family: var(--font-display);
    font-weight: 600;
    font-size: 18px;
    color: var(--color-text);
}

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

.nav a {
    font-size: 13px;
    font-weight: 500;
    color: var(--color-text-secondary);
    transition: var(--transition);
    letter-spacing: 0.02em;
}

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

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

.menu-toggle span {
    display: block;
    width: 20px;
    height: 2px;
    background: var(--color-text);
    border-radius: 2px;
    transition: var(--transition);
}

/* --- Hero --- */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: 52px;
    overflow: hidden;
    background: var(--color-dark-bg);
}

.hero-bg {
    position: absolute;
    inset: 0;
    background:
        radial-gradient(ellipse at 20% 50%, rgba(94, 92, 230, 0.15) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 50%, rgba(0, 122, 255, 0.1) 0%, transparent 50%),
        radial-gradient(ellipse at 50% 100%, rgba(94, 92, 230, 0.05) 0%, transparent 40%);
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    max-width: 700px;
    margin: 0 auto;
    padding: 100px 24px 40px;
}

@media (min-width: 900px) {
    .hero-content {
        text-align: left;
        margin: 0;
        padding: 120px 24px 60px;
    }
    
    .hero {
        flex-direction: row;
    }
    
    .hero-inner {
        display: grid;
        grid-template-columns: 1fr 1fr;
        align-items: center;
        max-width: var(--container-width);
        margin: 0 auto;
        padding: 0 24px;
        gap: 40px;
    }
    
    .hero-cta {
        justify-content: flex-start;
    }
    
    .hero-visual {
        padding: 60px 24px 40px;
    }
    
    .hero-phone {
        max-width: 450px;
    }
}

.hero-eyebrow {
    display: inline-block;
    font-family: var(--font-display);
    font-size: 14px;
    font-weight: 600;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--color-accent);
    margin-bottom: 24px;
    padding: 6px 16px;
    border: 1px solid rgba(94, 92, 230, 0.3);
    border-radius: 100px;
    background: rgba(94, 92, 230, 0.08);
}

.hero-title {
    font-family: var(--font-display);
    font-size: clamp(48px, 8vw, 88px);
    font-weight: 700;
    line-height: 1.05;
    color: var(--color-dark-text);
    margin-bottom: 24px;
    letter-spacing: -0.03em;
}

.gradient-text {
    background: linear-gradient(135deg, var(--color-gradient-start), var(--color-gradient-end));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: clamp(16px, 2vw, 21px);
    font-weight: 400;
    color: var(--color-dark-text-secondary);
    max-width: 600px;
    margin: 0 auto 40px;
    line-height: 1.6;
}

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

.btn-primary {
    display: inline-flex;
    align-items: center;
    padding: 14px 32px;
    border-radius: 100px;
    font-family: var(--font-body);
    font-size: 15px;
    font-weight: 600;
    color: #fff;
    background: var(--color-accent);
    border: none;
    transition: var(--transition);
    cursor: pointer;
}

.btn-primary:hover {
    background: var(--color-accent-hover);
    transform: translateY(-1px);
    box-shadow: 0 8px 30px rgba(94, 92, 230, 0.3);
}

.btn-secondary {
    display: inline-flex;
    align-items: center;
    padding: 14px 32px;
    border-radius: 100px;
    font-family: var(--font-body);
    font-size: 15px;
    font-weight: 600;
    color: var(--color-dark-text);
    background: transparent;
    border: 1px solid rgba(255, 255, 255, 0.2);
    transition: var(--transition);
    cursor: pointer;
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.08);
    border-color: rgba(255, 255, 255, 0.4);
}

.hero-visual {
    position: relative;
    z-index: 1;
    max-width: 900px;
    margin: 0 auto;
    padding: 40px 24px 0;
    text-align: center;
}

.hero-phone {
    width: 100%;
    max-width: 500px;
    height: auto;
    margin: 0 auto;
    border-radius: var(--radius-xl);
    box-shadow: 0 30px 80px rgba(0, 0, 0, 0.5);
    transition: var(--transition-slow);
}

.hero-scroll {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    color: var(--color-dark-text-secondary);
    font-size: 12px;
    font-weight: 500;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    animation: float 3s ease-in-out infinite;
}

.scroll-arrow {
    width: 20px;
    height: 20px;
    border-right: 2px solid var(--color-dark-text-secondary);
    border-bottom: 2px solid var(--color-dark-text-secondary);
    transform: rotate(45deg);
    animation: scrollBounce 2s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateX(-50%) translateY(0); }
    50% { transform: translateX(-50%) translateY(-8px); }
}

@keyframes scrollBounce {
    0%, 100% { opacity: 0.4; }
    50% { opacity: 1; }
}

/* --- Sections --- */
.section {
    padding: var(--section-padding);
}

.section-dark {
    background: var(--color-dark-bg);
    color: var(--color-dark-text);
}

.section-header {
    text-align: center;
    max-width: 680px;
    margin: 0 auto 64px;
}

.section-eyebrow {
    display: inline-block;
    font-family: var(--font-display);
    font-size: 13px;
    font-weight: 600;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--color-accent);
    margin-bottom: 16px;
    padding: 4px 14px;
    border: 1px solid rgba(94, 92, 230, 0.25);
    border-radius: 100px;
    background: rgba(94, 92, 230, 0.06);
}

.section-title {
    font-family: var(--font-display);
    font-size: clamp(32px, 5vw, 52px);
    font-weight: 700;
    line-height: 1.1;
    margin-bottom: 16px;
    letter-spacing: -0.02em;
}

.section-desc {
    font-size: 18px;
    color: var(--color-text-secondary);
    line-height: 1.7;
}

.section-dark .section-desc {
    color: var(--color-dark-text-secondary);
}

/* --- Timeline --- */
.timeline {
    position: relative;
    max-width: 700px;
    margin: 0 auto;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 24px;
    top: 0;
    bottom: 0;
    width: 1px;
    background: linear-gradient(to bottom, var(--color-accent), transparent);
    opacity: 0.3;
}

.timeline-item {
    position: relative;
    padding: 0 0 48px 64px;
}

.timeline-item:last-child {
    padding-bottom: 0;
}

.timeline-year {
    position: absolute;
    left: 0;
    top: 0;
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-surface);
    border: 2px solid var(--color-accent);
    border-radius: var(--radius-full);
    font-family: var(--font-display);
    font-size: 13px;
    font-weight: 700;
    color: var(--color-accent);
    z-index: 1;
}

.timeline-content h3 {
    font-family: var(--font-display);
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 6px;
    color: var(--color-text);
}

.timeline-content p {
    font-size: 15px;
    color: var(--color-text-secondary);
    line-height: 1.6;
}

/* --- Models Grid --- */
.models-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 24px;
}

.model-card {
    background: var(--color-dark-surface);
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 1px solid rgba(255, 255, 255, 0.06);
    transition: var(--transition);
    cursor: pointer;
}

.model-card:hover {
    transform: translateY(-4px);
    border-color: rgba(94, 92, 230, 0.3);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.4);
}

.model-card-image {
    aspect-ratio: 16/9;
    background: linear-gradient(135deg, #1a1a2e, #2d2b55);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.model-card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition-slow);
}

.model-card:hover .model-card-image img {
    transform: scale(1.05);
}

.model-card-body {
    padding: 24px;
}

.model-card-body h3 {
    font-family: var(--font-display);
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 4px;
    color: var(--color-dark-text);
}

.model-card-year {
    font-size: 13px;
    color: var(--color-accent);
    font-weight: 500;
    margin-bottom: 8px;
}

.model-card-body p {
    font-size: 14px;
    color: var(--color-dark-text-secondary);
    line-height: 1.5;
}

.model-card-placeholder {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 40px;
    font-weight: 700;
    color: rgba(255, 255, 255, 0.1);
    font-family: var(--font-display);
}

/* --- Innovation Grid --- */
.innov-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 20px;
}

.innov-card {
    padding: 32px;
    border-radius: var(--radius-md);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    transition: var(--transition);
}

.innov-card:hover {
    border-color: var(--color-accent);
    box-shadow: 0 8px 40px rgba(94, 92, 230, 0.08);
    transform: translateY(-2px);
}

.innov-icon {
    width: 48px;
    height: 48px;
    margin-bottom: 16px;
    color: var(--color-accent);
}

.innov-icon svg {
    width: 100%;
    height: 100%;
}

.innov-card h3 {
    font-family: var(--font-display);
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--color-text);
}

.innov-card p {
    font-size: 14px;
    color: var(--color-text-secondary);
    line-height: 1.6;
}

/* --- Gallery --- */
.gallery-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
}

.gallery-item {
    border-radius: var(--radius-md);
    overflow: hidden;
    aspect-ratio: 1;
    background: var(--color-dark-surface);
    border: 1px solid rgba(255, 255, 255, 0.06);
    transition: var(--transition);
}

.gallery-item:hover {
    transform: scale(1.02);
    border-color: rgba(94, 92, 230, 0.3);
}

.gallery-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.gallery-item:nth-child(1) { grid-column: span 2; grid-row: span 2; }
.gallery-item:nth-child(2) { grid-column: 3; }
.gallery-item:nth-child(3) { grid-column: 3; }
.gallery-item:nth-child(5) { grid-column: span 2; }

.gallery-placeholder {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #1a1a2e, #2d2b55);
    font-family: var(--font-display);
    font-size: 24px;
    font-weight: 600;
    color: rgba(255, 255, 255, 0.15);
}

/* --- CTA Section --- */
.cta-section {
    background: linear-gradient(135deg, var(--color-dark-bg) 0%, #1a1a2e 50%, #0a0a0a 100%);
    text-align: center;
    padding: 120px 0;
}

.cta-content {
    max-width: 600px;
    margin: 0 auto;
}

.cta-title {
    font-family: var(--font-display);
    font-size: clamp(32px, 5vw, 52px);
    font-weight: 700;
    color: var(--color-dark-text);
    margin-bottom: 16px;
    letter-spacing: -0.02em;
}

.cta-desc {
    font-size: 18px;
    color: var(--color-dark-text-secondary);
    margin-bottom: 32px;
    line-height: 1.6;
}

/* --- Footer --- */
.footer {
    background: var(--color-dark-bg);
    border-top: 1px solid rgba(255, 255, 255, 0.06);
    padding: 80px 0 0;
}

.footer-inner {
    display: grid;
    grid-template-columns: 1.5fr 2fr;
    gap: 60px;
    padding-bottom: 60px;
}

.footer-brand .logo {
    color: var(--color-dark-text);
    margin-bottom: 12px;
}

.footer-desc {
    font-size: 14px;
    color: var(--color-dark-text-secondary);
    line-height: 1.6;
    max-width: 300px;
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}

.footer-col h4 {
    font-family: var(--font-display);
    font-size: 13px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-dark-text);
    margin-bottom: 16px;
}

.footer-col a {
    display: block;
    font-size: 14px;
    color: var(--color-dark-text-secondary);
    margin-bottom: 8px;
    transition: var(--transition);
}

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

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.06);
    padding: 24px 0;
}

.footer-bottom p {
    font-size: 12px;
    color: var(--color-text-tertiary);
    text-align: center;
}

/* --- Scroll Animations --- */
.fade-up {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

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

/* --- Responsive --- */
@media (max-width: 768px) {
    :root {
        --section-padding: 80px 0;
    }

    .nav {
        display: none;
    }

    .nav.open {
        display: flex;
        flex-direction: column;
        position: absolute;
        top: 52px;
        left: 0;
        right: 0;
        background: rgba(245, 245, 247, 0.98);
        backdrop-filter: blur(20px);
        padding: 20px 24px;
        gap: 16px;
        border-bottom: 1px solid var(--color-border);
    }

    .menu-toggle {
        display: flex;
    }

    .hero-title {
        font-size: 40px;
    }

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

    .timeline-item {
        padding-left: 52px;
    }

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

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

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

    .gallery-item:nth-child(1) { grid-column: span 2; grid-row: span 1; }
    .gallery-item:nth-child(5) { grid-column: span 2; };

    .footer-inner {
        grid-template-columns: 1fr;
        gap: 40px;
    }

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

@media (max-width: 480px) {
    .gallery-grid {
        grid-template-columns: 1fr;
    }

    .gallery-item:nth-child(1) { grid-column: 1; }
    .gallery-item:nth-child(5) { grid-column: 1; }

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

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    html {
        scroll-behavior: auto;
    }
}