:root {
    /* Color Palette - Premium Neutrals & Gold Accents */
    --bg-primary: #ffffff;
    --bg-secondary: #fbfbfd;
    --text-primary: #1d1d1f;
    --text-secondary: #86868b;
    --accent: #ffcc00; /* Apple-style Gold/Amber */
    --accent-hover: #e6b800;
    --glass-bg: rgba(255, 255, 255, 0.72);
    --glass-border: rgba(0, 0, 0, 0.08);
    --card-shadow: 0 8px 30px rgba(0, 0, 0, 0.04);
    --card-hover-shadow: 0 20px 40px rgba(0, 0, 0, 0.08);
    
    /* Typography */
    --font-main: 'Inter', -apple-system, BlinkMacSystemFont, "SF Pro Text", "Helvetica Neue", Arial, sans-serif;
    --letter-spacing-tight: -0.022em;
    --letter-spacing-v-tight: -0.04em;
    
    /* Layout */
    --container-max-width: 1100px;
    --section-padding: 120px 24px;
    --border-radius: 20px;
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg-primary: #000000;
        --bg-secondary: #161617;
        --text-primary: #f5f5f7;
        --text-secondary: #a1a1a6;
        --glass-bg: rgba(22, 22, 23, 0.8);
        --glass-border: rgba(255, 255, 255, 0.12);
        --card-shadow: 0 8px 30px rgba(0, 0, 0, 0.4);
        --card-hover-shadow: 0 20px 40px rgba(0, 0, 0, 0.6);
    }
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-font-smoothing: antialiased;
}

body {
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-family: var(--font-main);
    line-height: 1.47059;
    font-weight: 400;
    overflow-x: hidden;
}

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

/* Header & Navigation */
header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    background-color: var(--glass-bg);
    border-bottom: 1px solid var(--glass-border);
    transition: background-color 0.3s ease;
}

header .container {
    height: 64px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-weight: 600;
    font-size: 1.2rem;
    letter-spacing: var(--letter-spacing-tight);
    text-decoration: none;
    color: var(--text-primary);
}

.logo img {
    width: 32px;
    height: 32px;
    border-radius: 8px;
}

nav a {
    color: var(--text-primary);
    text-decoration: none;
    font-size: 0.85rem;
    font-weight: 500;
    opacity: 0.8;
    transition: opacity 0.2s;
}

nav a:hover {
    opacity: 1;
}

/* Hero Section */
.hero {
    padding: 200px 24px 120px;
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.app-icon-large {
    width: 120px;
    height: 120px;
    margin-bottom: 40px;
    border-radius: 28px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
}

h1 {
    font-size: 5rem;
    line-height: 1.05;
    font-weight: 700;
    letter-spacing: var(--letter-spacing-v-tight);
    margin-bottom: 24px;
    background: linear-gradient(180deg, var(--text-primary) 0%, var(--text-secondary) 150%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.subtitle {
    font-size: 1.6rem;
    line-height: 1.3;
    font-weight: 500;
    color: var(--text-secondary);
    max-width: 700px;
    margin: 0 auto 48px;
    letter-spacing: var(--letter-spacing-tight);
}

.actions {
    display: flex;
    gap: 16px;
    justify-content: center;
}

.cta-button {
    display: inline-block;
    padding: 18px 32px;
    background-color: #0071e3; /* Classic Apple Blue */
    color: #ffffff;
    text-decoration: none;
    border-radius: 980px;
    font-weight: 600;
    font-size: 1.1rem;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.cta-button:hover {
    background-color: #0077ed;
    transform: scale(1.02);
}

.cta-button.secondary {
    background-color: transparent;
    color: #0071e3;
    border: none;
}

.cta-button.secondary:hover {
    text-decoration: underline;
    transform: none;
}

/* Features Grid */
.features {
    padding: var(--section-padding);
}

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

.feature-card {
    background-color: var(--bg-secondary);
    padding: 48px;
    border-radius: var(--border-radius);
    transition: transform 0.4s cubic-bezier(0.15, 0, 0.15, 1), box-shadow 0.4s ease;
    border: 1px solid var(--glass-border);
}

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--card-hover-shadow);
}

.icon-box {
    width: 56px;
    height: 56px;
    background: linear-gradient(135deg, #f5f5f7 0%, #e8e8ed 100%);
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 32px;
    color: #1d1d1f;
}

@media (prefers-color-scheme: dark) {
    .icon-box {
        background: linear-gradient(135deg, #1c1c1e 0%, #2c2c2e 100%);
        color: #f5f5f7;
    }
}

.feature-card h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 16px;
    letter-spacing: var(--letter-spacing-tight);
}

.feature-card p {
    color: var(--text-secondary);
    font-size: 1.05rem;
    line-height: 1.5;
}

/* Footer */
footer {
    padding: 100px 24px;
    border-top: 1px solid var(--glass-border);
    background-color: var(--bg-secondary);
    text-align: left;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    flex-wrap: wrap;
    gap: 40px;
}

.footer-brand .logo {
    margin-bottom: 24px;
}

.footer-links {
    display: flex;
    gap: 60px;
}

.footer-col h4 {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--text-secondary);
    margin-bottom: 20px;
}

.footer-col ul {
    list-style: none;
}

.footer-col ul li {
    margin-bottom: 12px;
}

.footer-col ul li a {
    color: var(--text-primary);
    text-decoration: none;
    font-size: 0.85rem;
    opacity: 0.8;
    transition: opacity 0.2s;
}

.footer-col ul li a:hover {
    opacity: 1;
}

.copyright {
    margin-top: 80px;
    font-size: 0.75rem;
    color: var(--text-secondary);
}

/* Responsive Scaling */
@media (max-width: 1068px) {
    h1 { font-size: 4.5rem; }
    .features-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 734px) {
    h1 { font-size: 3rem; }
    .subtitle { font-size: 1.25rem; }
    .features-grid { grid-template-columns: 1fr; }
    header .container { height: 52px; }
    .hero { padding-top: 140px; }
    .footer-links { gap: 40px; }
}

/* Animations */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.hero h1, .hero .subtitle, .hero .actions, .hero .app-icon-large {
    animation: fadeInUp 0.8s cubic-bezier(0.15, 0, 0.15, 1) both;
}

.hero .app-icon-large { animation-delay: 0.1s; }
.hero h1 { animation-delay: 0.2s; }
.hero .subtitle { animation-delay: 0.3s; }
.hero .actions { animation-delay: 0.4s; }