:root {
    --bg-main: #0B0F19;
    --bg-card: rgba(23, 31, 48, 0.75);
    --bg-card-border: rgba(255, 255, 255, 0.08);
    --accent-primary: #6366F1;
    --accent-primary-hover: #4F46E5;
    --accent-glow: rgba(99, 102, 241, 0.35);
    --accent-green: #10B981;
    --accent-orange: #F97316;
    --text-primary: #F8FAFC;
    --text-secondary: #94A3B8;
    --text-muted: #64748B;
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --radius-lg: 20px;
    --radius-md: 14px;
    --radius-sm: 8px;
    --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    -webkit-tap-highlight-color: transparent;
}

body {
    background-color: var(--bg-main);
    color: var(--text-primary);
    font-family: var(--font-family);
    min-height: 100vh;
    overflow-x: hidden;
    display: flex;
    justify-content: center;
    align-items: flex-start;
    padding: 0;
    margin: 0;
}

/* Starfield Parallax Canvas */
#starfield-canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: 0;
    pointer-events: none;
}

/* App Container */
.app-container {
    width: 100%;
    max-width: 480px;
    min-height: 100vh;
    padding: 20px;
    position: relative;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

/* Background Ambient Glows */
.glow {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    pointer-events: none;
    z-index: 0;
}

.glow-1 {
    width: 260px;
    height: 260px;
    background: rgba(99, 102, 241, 0.22);
    top: -60px;
    left: -60px;
    animation: floatGlow1 14s infinite alternate ease-in-out;
}

.glow-2 {
    width: 220px;
    height: 220px;
    background: rgba(249, 115, 22, 0.18);
    bottom: 50px;
    right: -40px;
    animation: floatGlow2 16s infinite alternate ease-in-out;
}

@keyframes floatGlow1 {
    0% { transform: translate(0, 0) scale(1); }
    50% { transform: translate(30px, 40px) scale(1.15); }
    100% { transform: translate(-20px, 20px) scale(0.95); }
}

@keyframes floatGlow2 {
    0% { transform: translate(0, 0) scale(1); }
    50% { transform: translate(-35px, -30px) scale(1.2); }
    100% { transform: translate(25px, -15px) scale(0.9); }
}

/* Header */
.header {
    position: relative;
    z-index: 1;
    margin-bottom: 20px;
}

.brand {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo-badge {
    width: 44px;
    height: 44px;
    border-radius: 12px;
    background: rgba(99, 102, 241, 0.15);
    border: 1px solid rgba(99, 102, 241, 0.3);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 14px rgba(99, 102, 241, 0.2);
}

.brand-text {
    display: flex;
    flex-direction: column;
}

.title-row {
    display: flex;
    align-items: center;
    gap: 8px;
}

.brand-text h1 {
    font-size: 18px;
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: -0.02em;
}

.status-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 12px;
    color: var(--text-secondary);
    margin-top: 2px;
}

.pulse-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background-color: var(--accent-green);
    box-shadow: 0 0 10px var(--accent-green);
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7); }
    70% { transform: scale(1); box-shadow: 0 0 0 8px rgba(16, 185, 129, 0); }
    100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0); }
}

/* Main Content */
.main-content {
    position: relative;
    z-index: 1;
    display: flex;
    flex-direction: column;
    gap: 18px;
}

/* OS Comparison Card */
.os-comparison-card {
    background: var(--bg-card);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--bg-card-border);
    border-radius: var(--radius-lg);
    padding: 16px;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.os-comparison-title {
    font-size: 13px;
    font-weight: 700;
    color: var(--text-primary);
}

.os-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
}

@media (max-width: 380px) {
    .os-grid {
        grid-template-columns: 1fr;
    }
}

.os-box {
    background: rgba(15, 23, 42, 0.6);
    border-radius: var(--radius-md);
    padding: 12px;
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.android-box {
    border: 1px solid rgba(16, 185, 129, 0.3);
}

.ios-box {
    border: 1px solid rgba(56, 189, 248, 0.3);
}

.os-badge-header {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 3px 8px;
    border-radius: 6px;
    font-size: 11px;
    font-weight: 700;
    width: max-content;
    background: rgba(16, 185, 129, 0.2);
    color: #34D399;
}

.ios-header {
    background: rgba(56, 189, 248, 0.2);
    color: #38BDF8;
}

.os-desc {
    font-size: 11.5px;
    color: var(--text-secondary);
    line-height: 1.4;
}

/* Cards Glassmorphism */
.hero-card, .features-card, .guide-card {
    background: var(--bg-card);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--bg-card-border);
    border-radius: var(--radius-lg);
    padding: 20px;
    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.35);
    transition: var(--transition);
}

.card-tag {
    display: inline-block;
    padding: 4px 10px;
    border-radius: 20px;
    background: rgba(99, 102, 241, 0.15);
    border: 1px solid rgba(99, 102, 241, 0.3);
    color: #818CF8;
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 12px;
}

.hero-title {
    font-size: 19px;
    font-weight: 800;
    line-height: 1.3;
    margin-bottom: 10px;
    color: var(--text-primary);
    background: linear-gradient(135deg, #FFFFFF 0%, #CBD5E1 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-description {
    font-size: 13.5px;
    line-height: 1.55;
    color: var(--text-secondary);
}

/* Features Grid */
.card-section-title {
    font-size: 16px;
    font-weight: 700;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.section-intro {
    font-size: 13px;
    line-height: 1.5;
    color: var(--text-secondary);
    margin-bottom: 14px;
}

.features-grid {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-bottom: 14px;
}

.feature-item {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    background: rgba(15, 23, 42, 0.6);
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: var(--radius-md);
    padding: 12px;
}

.feature-icon {
    font-size: 20px;
    line-height: 1;
    flex-shrink: 0;
    margin-top: 2px;
}

.feature-content {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.feature-content strong {
    font-size: 13.5px;
    color: var(--text-primary);
}

.feature-content span {
    font-size: 12.5px;
    color: var(--text-secondary);
    line-height: 1.4;
}

.key-benefit-box {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    background: rgba(99, 102, 241, 0.1);
    border: 1px solid rgba(99, 102, 241, 0.25);
    border-radius: var(--radius-md);
    padding: 12px;
}

.benefit-icon {
    font-size: 18px;
    flex-shrink: 0;
}

.benefit-text {
    font-size: 12.5px;
    line-height: 1.45;
    color: #C7D2FE;
}

/* Guide Steps */
.guide-title {
    font-size: 16px;
    font-weight: 700;
    margin-bottom: 16px;
    color: var(--text-primary);
}

.guide-steps {
    display: flex;
    flex-direction: column;
    gap: 14px;
}

.guide-step-item {
    display: flex;
    gap: 14px;
    align-items: flex-start;
    background: rgba(15, 23, 42, 0.5);
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: var(--radius-md);
    padding: 14px;
}

.step-num {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background: linear-gradient(135deg, #6366F1, #4F46E5);
    color: #FFFFFF;
    font-weight: 800;
    font-size: 13px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    box-shadow: 0 4px 10px rgba(99, 102, 241, 0.3);
}

.step-text {
    display: flex;
    flex-direction: column;
    gap: 4px;
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.45;
}

.step-text strong {
    color: var(--text-primary);
    font-size: 13.5px;
}

.download-direct-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 16px;
    background: linear-gradient(135deg, #6366F1 0%, #4F46E5 100%);
    color: #FFFFFF;
    border-radius: var(--radius-md);
    text-decoration: none;
    font-weight: 600;
    font-size: 13px;
    box-shadow: 0 4px 14px var(--accent-glow);
    transition: var(--transition);
    border: none;
    cursor: pointer;
}

.download-direct-btn:hover, .download-direct-btn:active {
    transform: translateY(-1px);
    box-shadow: 0 6px 20px rgba(99, 102, 241, 0.5);
}

.note-box {
    margin-top: 14px;
    font-size: 11.5px;
    color: var(--text-muted);
    text-align: center;
}

/* Toast Notification */
.toast {
    position: fixed;
    bottom: 24px;
    left: 50%;
    transform: translateX(-50%);
    background: rgba(30, 41, 59, 0.95);
    border: 1px solid rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(10px);
    padding: 10px 20px;
    border-radius: 30px;
    color: var(--text-primary);
    font-size: 13px;
    font-weight: 500;
    z-index: 100;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.5);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.toast.hidden {
    opacity: 0;
    transform: translate(-50%, 20px);
    pointer-events: none;
}

/* Video Card */
.video-card {
    background: var(--bg-card);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--bg-card-border);
    border-radius: var(--radius-lg);
    padding: 20px;
    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.35);
    display: flex;
    flex-direction: column;
    gap: 14px;
}

.video-info {
    display: flex;
    align-items: center;
    gap: 12px;
}

.video-icon {
    font-size: 24px;
    flex-shrink: 0;
}

.video-text {
    display: flex;
    flex-direction: column;
    gap: 3px;
}

.video-text strong {
    font-size: 14px;
    color: var(--text-primary);
}

.video-text span {
    font-size: 12px;
    color: var(--text-secondary);
}

.btn-video {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    width: 100%;
    padding: 12px 16px;
    background: linear-gradient(135deg, #EF4444 0%, #DC2626 100%);
    color: #FFFFFF;
    border-radius: var(--radius-md);
    text-decoration: none;
    font-weight: 600;
    font-size: 13.5px;
    box-shadow: 0 4px 14px rgba(239, 68, 68, 0.35);
    transition: var(--transition);
    border: none;
}

.btn-video:hover, .btn-video:active {
    transform: translateY(-1px);
    box-shadow: 0 6px 20px rgba(239, 68, 68, 0.5);
}