/* =============================================
   CSS VARIABLES & ROOT
   ============================================= */

:root {
    /* Colors */
    --navy: #0a0e27;
    --violet: #7c3aed;
    --violet-light: #8b5cf6;
    --blue: #0ea5e9;
    --blue-light: #06b6d4;
    --pink: #ec4899;
    --white: #ffffff;
    --gray-100: #f8f9fa;
    --gray-200: #e9ecef;
    --gray-300: #dee2e6;
    --gray-600: #6c757d;
    --gray-700: #495057;
    --gray-800: #343a40;
    --gray-900: #212529;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    --spacing-3xl: 6rem;
    
    /* Sizing */
    --max-width: 1200px;
    --radius: 0.5rem;
    --radius-lg: 1rem;
    --radius-full: 9999px;
    
    /* Typography */
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    --font-size-4xl: 2.25rem;
    --font-size-5xl: 3rem;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    
    /* Transitions */
    --transition-fast: 150ms ease-in-out;
    --transition: 300ms ease-in-out;
    --transition-slow: 500ms ease-in-out;
}

/* Respect prefers-reduced-motion */
@media (prefers-reduced-motion: reduce) {
    :root {
        --transition-fast: 0ms;
        --transition: 0ms;
        --transition-slow: 0ms;
    }
}

/* =============================================
   GLOBAL STYLES
   ============================================= */

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    background-color: var(--navy);
    color: var(--white);
    line-height: 1.6;
    font-size: var(--font-size-base);
    overflow-x: hidden;
}

/* =============================================
   TYPOGRAPHY
   ============================================= */

h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.2;
}

p {
    margin-bottom: var(--spacing-md);
}

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

a:hover {
    color: var(--violet-light);
}

/* =============================================
   CONTAINER & LAYOUT
   ============================================= */

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

section {
    padding: var(--spacing-3xl) 0;
}

.section-title {
    font-size: var(--font-size-4xl);
    margin-bottom: var(--spacing-3xl);
    text-align: center;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

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

.navbar {
    position: sticky;
    top: 0;
    z-index: 100;
    background-color: rgba(10, 14, 39, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(124, 58, 237, 0.1);
    padding: var(--spacing-md) 0;
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--white);
}

.logo-icon {
    width: 32px;
    height: 32px;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: var(--spacing-xl);
    list-style: none;
}

.nav-menu a {
    color: rgba(255, 255, 255, 0.7);
    font-size: var(--font-size-base);
    transition: color var(--transition);
}

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

.nav-cta {
    background-color: var(--violet);
    color: var(--white) !important;
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--radius-full);
    font-size: var(--font-size-sm);
    transition: background-color var(--transition);
}

.nav-cta:hover {
    background-color: var(--violet-light) !important;
}

.hamburger {
    display: none;
    flex-direction: column;
    background: none;
    border: none;
    cursor: pointer;
    gap: 4px;
    padding: var(--spacing-xs);
}

.hamburger span {
    width: 24px;
    height: 2px;
    background-color: var(--white);
    border-radius: 2px;
    transition: all var(--transition);
}

.hamburger.active span:nth-child(1) {
    transform: rotate(45deg) translate(8px, 8px);
}

.hamburger.active span:nth-child(2) {
    opacity: 0;
}

.hamburger.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -7px);
}

/* Mobile Navigation */
@media (max-width: 768px) {
    .hamburger {
        display: flex;
    }
    
    .nav-menu {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background-color: rgba(10, 14, 39, 0.98);
        flex-direction: column;
        gap: var(--spacing-md);
        padding: var(--spacing-lg);
        border-top: 1px solid rgba(124, 58, 237, 0.1);
        max-height: 0;
        overflow: hidden;
        transition: max-height var(--transition);
    }
    
    .nav-menu.active {
        max-height: 400px;
    }
    
    .nav-menu a {
        display: block;
    }
}

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

.hero {
    padding: var(--spacing-3xl) 0;
}

.hero-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-3xl);
    align-items: center;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

.hero-badge {
    display: inline-block;
    background-color: rgba(124, 58, 237, 0.1);
    color: var(--violet);
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--radius-full);
    font-size: var(--font-size-sm);
    font-weight: 500;
    margin-bottom: var(--spacing-lg);
    border: 1px solid rgba(124, 58, 237, 0.2);
}

.hero-title {
    font-size: var(--font-size-5xl);
    margin-bottom: var(--spacing-md);
    line-height: 1.1;
}

.hero-subtitle {
    font-size: var(--font-size-2xl);
    color: rgba(255, 255, 255, 0.8);
    margin-bottom: var(--spacing-lg);
}

.hero-description {
    font-size: var(--font-size-lg);
    color: rgba(255, 255, 255, 0.7);
    margin-bottom: var(--spacing-2xl);
    max-width: 500px;
}

.hero-ctas {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-2xl);
}

.hero-metadata {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: var(--font-size-sm);
    color: rgba(255, 255, 255, 0.6);
}

/* =============================================
   BUTTONS
   ============================================= */

.btn {
    display: inline-block;
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--radius-full);
    font-size: var(--font-size-base);
    font-weight: 500;
    border: 2px solid transparent;
    cursor: pointer;
    transition: all var(--transition);
    text-align: center;
    white-space: nowrap;
}

.btn-primary {
    background-color: var(--violet);
    color: var(--white);
    box-shadow: 0 0 0 0 rgba(124, 58, 237, 0.4);
}

.btn-primary:hover {
    background-color: var(--violet-light);
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(124, 58, 237, 0.3);
}

.btn-primary:active {
    transform: translateY(0);
}

.btn-secondary {
    background-color: transparent;
    color: var(--white);
    border: 2px solid rgba(124, 58, 237, 0.3);
}

.btn-secondary:hover {
    background-color: rgba(124, 58, 237, 0.1);
    border-color: var(--violet);
}

.btn-large {
    padding: var(--spacing-md) var(--spacing-2xl);
    font-size: var(--font-size-lg);
}

/* =============================================
   PHONE MOCKUP
   ============================================= */

.hero-visual {
    display: flex;
    justify-content: center;
    align-items: center;
}

.phone-mockup {
    perspective: 1000px;
}

.phone-frame {
    width: 280px;
    height: 580px;
    background: linear-gradient(135deg, #1a1f3a 0%, #0a0e27 100%);
    border-radius: 48px;
    padding: 12px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3), inset 0 1px 0 rgba(255, 255, 255, 0.1);
    position: relative;
    border: 1px solid rgba(124, 58, 237, 0.2);
}

.phone-notch {
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 140px;
    height: 24px;
    background-color: var(--navy);
    border-radius: 0 0 24px 24px;
    z-index: 10;
}

.phone-screen {
    width: 100%;
    height: 100%;
    background-color: var(--navy);
    border-radius: 44px;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.phone-status-bar {
    padding: 8px var(--spacing-sm) 4px;
    display: flex;
    justify-content: center;
    font-size: 12px;
    font-weight: 600;
    padding-top: 20px;
}

.time {
    color: var(--white);
}

.phone-content {
    flex: 1;
    padding: var(--spacing-md);
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.album-art {
    width: 120px;
    height: 120px;
    margin: 0 auto;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: 0 10px 30px rgba(124, 58, 237, 0.3);
}

.album-art svg {
    width: 100%;
    height: 100%;
}

.song-info {
    text-align: center;
}

.song-title {
    font-size: var(--font-size-base);
    font-weight: 600;
    margin-bottom: 4px;
}

.song-artist {
    font-size: var(--font-size-sm);
    color: rgba(255, 255, 255, 0.6);
}

.progress-bar {
    width: 100%;
    height: 3px;
    background-color: rgba(255, 255, 255, 0.1);
    border-radius: 2px;
    overflow: hidden;
    margin: var(--spacing-sm) 0;
}

.progress-fill {
    height: 100%;
    width: 35%;
    background: linear-gradient(90deg, var(--violet), var(--blue));
    border-radius: 2px;
}

.time-display {
    display: flex;
    justify-content: space-between;
    font-size: 11px;
    color: rgba(255, 255, 255, 0.6);
    margin-bottom: var(--spacing-md);
}

.controls {
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
    margin-top: auto;
    padding-bottom: var(--spacing-sm);
}

.control-btn {
    background: none;
    border: none;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: rgba(255, 255, 255, 0.7);
    cursor: pointer;
    transition: all var(--transition);
}

.control-btn svg {
    width: 20px;
    height: 20px;
}

.control-btn:hover {
    color: var(--white);
    background-color: rgba(124, 58, 237, 0.1);
}

.play-btn {
    background-color: var(--violet);
    color: var(--white);
    width: 48px;
    height: 48px;
}

.favorite-btn {
    color: var(--pink);
}

.favorite-btn:hover {
    background-color: rgba(236, 72, 153, 0.1);
}

.phone-bottom-nav {
    display: flex;
    justify-content: space-around;
    padding: var(--spacing-sm) 0;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.nav-icon {
    background: none;
    border: none;
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: rgba(255, 255, 255, 0.5);
    cursor: pointer;
    transition: all var(--transition);
}

.nav-icon svg {
    width: 20px;
    height: 20px;
}

.nav-icon.active {
    color: var(--violet);
}

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

.phone-frame-bottom {
    height: 12px;
    background: linear-gradient(to bottom, rgba(0, 0, 0, 0.2), rgba(0, 0, 0, 0.4));
    border-radius: 0 0 48px 48px;
}

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

.features {
    background: linear-gradient(135deg, rgba(124, 58, 237, 0.05) 0%, rgba(14, 165, 233, 0.05) 100%);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-2xl);
}

.feature-card {
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid rgba(124, 58, 237, 0.2);
    border-radius: var(--radius-lg);
    padding: var(--spacing-2xl);
    transition: all var(--transition);
}

.feature-card:hover {
    background: rgba(124, 58, 237, 0.1);
    border-color: var(--violet);
    transform: translateY(-4px);
}

.feature-icon {
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, var(--violet), var(--violet-light));
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-lg);
    color: var(--white);
}

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

.feature-card h3 {
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-md);
}

.feature-card p {
    color: rgba(255, 255, 255, 0.7);
    margin-bottom: 0;
}

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

.how-it-works {
    background-color: rgba(10, 20, 50, 0.5);
}

.steps-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-2xl);
    margin-bottom: var(--spacing-2xl);
}

.step {
    text-align: center;
}

.step-number {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    background: linear-gradient(135deg, var(--violet), var(--blue));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--spacing-md);
}

.step h3 {
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-md);
}

.step p {
    color: rgba(255, 255, 255, 0.7);
    margin-bottom: 0;
}

.how-note {
    text-align: center;
    color: rgba(255, 255, 255, 0.6);
    font-size: var(--font-size-sm);
}

/* =============================================
   TRUST SECTION
   ============================================= */

.trust {
    text-align: center;
    background: linear-gradient(135deg, rgba(124, 58, 237, 0.1) 0%, rgba(14, 165, 233, 0.05) 100%);
}

.trust-description {
    max-width: 600px;
    margin: 0 auto var(--spacing-2xl);
    color: rgba(255, 255, 255, 0.8);
    font-size: var(--font-size-lg);
}

/* =============================================
   DOWNLOAD SECTION
   ============================================= */

.download {
    background: linear-gradient(135deg, rgba(124, 58, 237, 0.15) 0%, rgba(14, 165, 233, 0.1) 100%);
}

.download-card {
    background: rgba(255, 255, 255, 0.03);
    border: 2px solid rgba(124, 58, 237, 0.3);
    border-radius: var(--radius-lg);
    padding: var(--spacing-3xl);
    text-align: center;
    max-width: 600px;
    margin: 0 auto;
}

.download-card h2 {
    font-size: var(--font-size-3xl);
    margin-bottom: var(--spacing-md);
}

.download-card p {
    color: rgba(255, 255, 255, 0.7);
    margin-bottom: var(--spacing-2xl);
}

.btn-primary.btn-large {
    margin-bottom: var(--spacing-xl);
}

.download-metadata {
    display: flex;
    justify-content: center;
    gap: var(--spacing-sm);
    font-size: var(--font-size-sm);
    color: rgba(255, 255, 255, 0.6);
    margin-bottom: var(--spacing-lg);
}

.download-note {
    font-size: var(--font-size-sm);
    color: rgba(255, 255, 255, 0.6);
}

.download-note a {
    color: var(--violet);
}

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

.faq {
    background-color: rgba(10, 20, 50, 0.5);
}

.faq-container {
    max-width: 700px;
    margin: 0 auto;
}

.faq-item {
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid rgba(124, 58, 237, 0.2);
    border-radius: var(--radius-lg);
    margin-bottom: var(--spacing-md);
    overflow: hidden;
}

.faq-question {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-lg);
    cursor: pointer;
    font-weight: 500;
    user-select: none;
    transition: all var(--transition);
}

.faq-question:hover {
    background-color: rgba(124, 58, 237, 0.1);
}

.faq-question::after {
    content: '▼';
    font-size: 12px;
    transition: transform var(--transition);
    color: var(--violet);
}

details[open] .faq-question {
    background-color: rgba(124, 58, 237, 0.1);
}

details[open] .faq-question::after {
    transform: rotate(180deg);
}

.faq-answer {
    padding: 0 var(--spacing-lg) var(--spacing-lg);
    color: rgba(255, 255, 255, 0.7);
    animation: slideDown var(--transition);
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.faq-answer p {
    margin-bottom: 0;
}

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

.footer {
    background-color: rgba(0, 0, 0, 0.3);
    border-top: 1px solid rgba(124, 58, 237, 0.1);
    padding: var(--spacing-3xl) 0 var(--spacing-2xl);
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-3xl);
    margin-bottom: var(--spacing-2xl);
    max-width: var(--max-width);
    margin-left: auto;
    margin-right: auto;
    padding: 0 var(--spacing-lg);
}

.footer-branding p {
    color: rgba(255, 255, 255, 0.6);
    margin-bottom: 0;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-bottom: var(--spacing-md);
}

.footer-links {
    display: flex;
    gap: var(--spacing-lg);
    justify-content: flex-end;
}

.footer-links a {
    color: rgba(255, 255, 255, 0.7);
    transition: color var(--transition);
}

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

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-2xl);
    border-top: 1px solid rgba(124, 58, 237, 0.1);
    max-width: var(--max-width);
    margin-left: auto;
    margin-right: auto;
    padding-left: var(--spacing-lg);
    padding-right: var(--spacing-lg);
    color: rgba(255, 255, 255, 0.5);
    font-size: var(--font-size-sm);
}

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

/* Tablet (768px and below) */
@media (max-width: 768px) {
    :root {
        --font-size-5xl: 2.5rem;
        --font-size-4xl: 2rem;
        --font-size-3xl: 1.5rem;
        --spacing-3xl: 4rem;
        --spacing-2xl: 2.5rem;
    }
    
    .hero-container {
        grid-template-columns: 1fr;
        gap: var(--spacing-2xl);
    }
    
    .phone-mockup {
        max-width: 240px;
    }
    
    .phone-frame {
        width: 240px;
        height: 490px;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .steps-grid {
        grid-template-columns: 1fr;
    }
    
    .hero-ctas {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-2xl);
    }
    
    .footer-links {
        justify-content: flex-start;
    }
}

/* Mobile (480px and below) */
@media (max-width: 480px) {
    :root {
        --font-size-5xl: 2rem;
        --font-size-4xl: 1.5rem;
        --font-size-3xl: 1.25rem;
        --font-size-2xl: 1.125rem;
        --spacing-3xl: 2.5rem;
        --spacing-2xl: 2rem;
        --spacing-xl: 1.5rem;
    }
    
    section {
        padding: var(--spacing-2xl) 0;
    }
    
    .container {
        padding: 0 var(--spacing-md);
    }
    
    .nav-container {
        padding: 0 var(--spacing-md);
    }
    
    .hero {
        padding: var(--spacing-2xl) 0;
    }
    
    .hero-container {
        padding: 0 var(--spacing-md);
    }
    
    .hero-title {
        font-size: var(--font-size-3xl);
    }
    
    .hero-subtitle {
        font-size: var(--font-size-lg);
    }
    
    .phone-mockup {
        max-width: 200px;
    }
    
    .phone-frame {
        width: 200px;
        height: 410px;
        border-radius: 32px;
        padding: 8px;
    }
    
    .phone-content {
        padding: var(--spacing-sm);
        gap: var(--spacing-sm);
    }
    
    .album-art {
        width: 100px;
        height: 100px;
    }
    
    .controls {
        gap: var(--spacing-sm);
    }
    
    .control-btn {
        width: 32px;
        height: 32px;
    }
    
    .play-btn {
        width: 40px;
        height: 40px;
    }
    
    .feature-card {
        padding: var(--spacing-lg);
    }
    
    .download-card {
        padding: var(--spacing-2xl) var(--spacing-lg);
    }
    
    .section-title {
        font-size: var(--font-size-3xl);
        margin-bottom: var(--spacing-2xl);
    }
    
    .btn {
        padding: var(--spacing-sm) var(--spacing-md);
        font-size: var(--font-size-sm);
    }
    
    .btn-large {
        padding: var(--spacing-md) var(--spacing-lg);
        font-size: var(--font-size-base);
    }
    
    .faq-question {
        padding: var(--spacing-md);
    }
    
    .faq-answer {
        padding: 0 var(--spacing-md) var(--spacing-md);
    }
    
    .footer-content {
        padding: 0 var(--spacing-md);
    }
    
    .footer-bottom {
        padding: var(--spacing-lg) var(--spacing-md);
    }
}

/* =============================================
   PRINT STYLES
   ============================================= */

@media print {
    .navbar,
    .footer {
        display: none;
    }
}