:root {
    --bg-dark: #0b0f19;
    --card-bg: rgba(22, 30, 49, 0.75);
    --card-border: rgba(255, 255, 255, 0.1);
    --primary: #4361ee;
    --primary-light: #4cc9f0;
    --primary-gradient: linear-gradient(135deg, #4361ee 0%, #3a0ca3 100%);
    --accent-gradient: linear-gradient(135deg, #4cc9f0 0%, #4361ee 100%);
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --surface: #131b2e;
    --success: #10b981;
    --radius-sm: 8px;
    --radius-md: 14px;
    --radius-lg: 20px;
    --radius-full: 9999px;
    --shadow-glow: 0 0 25px rgba(67, 97, 238, 0.35);
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background-color: var(--bg-dark);
    color: var(--text-main);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
    background-image: 
        radial-gradient(circle at 15% 20%, rgba(67, 97, 238, 0.18) 0%, transparent 40%),
        radial-gradient(circle at 85% 75%, rgba(76, 201, 240, 0.12) 0%, transparent 40%);
}

h1, h2, h3, h4, .font-heading {
    font-family: 'Outfit', sans-serif;
}

.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 18px 32px;
    background: rgba(11, 15, 25, 0.85);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--card-border);
    position: sticky;
    top: 0;
    z-index: 100;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 20px;
    font-weight: 700;
    color: #fff;
    text-decoration: none;
}

.logo-icon {
    width: 38px;
    height: 38px;
    background: var(--primary-gradient);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 18px;
    box-shadow: 0 4px 15px rgba(67, 97, 238, 0.4);
}

.logo span {
    color: var(--primary-light);
}

.lang-toggle {
    display: flex;
    align-items: center;
    background: rgba(255, 255, 255, 0.08);
    border-radius: var(--radius-full);
    padding: 4px;
    border: 1px solid var(--card-border);
}

.lang-btn {
    background: transparent;
    border: none;
    font-size: 12px;
    font-weight: 700;
    color: var(--text-muted);
    padding: 5px 12px;
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: all 0.2s ease;
}

.lang-btn.active {
    background: white;
    color: #0f172a;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
}

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 40px 24px;
}

/* Hero Section */
.hero {
    text-align: center;
    padding: 50px 20px 40px;
}

.badge-tag {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: rgba(67, 97, 238, 0.15);
    border: 1px solid rgba(67, 97, 238, 0.3);
    color: var(--primary-light);
    padding: 6px 16px;
    border-radius: var(--radius-full);
    font-size: 13px;
    font-weight: 600;
    margin-bottom: 20px;
}

.hero-title {
    font-size: clamp(32px, 5vw, 52px);
    font-weight: 800;
    line-height: 1.15;
    margin-bottom: 20px;
    background: linear-gradient(135deg, #ffffff 0%, #cbd5e1 50%, #94a3b8 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-title span {
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-desc {
    font-size: clamp(16px, 2vw, 19px);
    color: var(--text-muted);
    max-width: 680px;
    margin: 0 auto 35px;
}

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

.btn-download {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    padding: 14px 28px;
    border-radius: var(--radius-full);
    text-decoration: none;
    font-weight: 600;
    font-size: 15px;
    transition: all 0.25s ease;
}

.btn-download.play {
    background: var(--primary-gradient);
    color: white;
    box-shadow: 0 4px 20px rgba(67, 97, 238, 0.4);
}

.btn-download.play:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(67, 97, 238, 0.6);
}

.btn-download.apple {
    background: rgba(255, 255, 255, 0.08);
    color: var(--text-muted);
    border: 1px solid var(--card-border);
    cursor: not-allowed;
}

/* Feature Grid */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
    margin: 60px 0;
}

.feature-card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: var(--radius-lg);
    padding: 30px 26px;
    backdrop-filter: blur(12px);
    transition: transform 0.25s ease, border-color 0.25s ease;
}

.feature-card:hover {
    transform: translateY(-4px);
    border-color: rgba(67, 97, 238, 0.4);
}

.feature-icon {
    width: 52px;
    height: 52px;
    background: rgba(67, 97, 238, 0.15);
    color: var(--primary-light);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 22px;
    margin-bottom: 20px;
    border: 1px solid rgba(67, 97, 238, 0.25);
}

.feature-title {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 10px;
    color: #fff;
}

.feature-text {
    font-size: 14px;
    color: var(--text-muted);
    line-height: 1.6;
}

/* Interactive Utility Card */
.util-card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: var(--radius-lg);
    padding: 36px;
    backdrop-filter: blur(16px);
    margin: 40px 0;
}

.util-card-header {
    text-align: center;
    margin-bottom: 28px;
}

.util-title {
    font-size: 24px;
    font-weight: 700;
    margin-bottom: 8px;
}

.util-subtitle {
    color: var(--text-muted);
    font-size: 15px;
}

.drop-zone {
    border: 2px dashed rgba(67, 97, 238, 0.4);
    border-radius: var(--radius-md);
    padding: 40px 20px;
    text-align: center;
    background: rgba(19, 27, 46, 0.6);
    cursor: pointer;
    transition: all 0.25s ease;
}

.drop-zone:hover, .drop-zone.dragover {
    border-color: var(--primary-light);
    background: rgba(67, 97, 238, 0.08);
}

.drop-icon {
    font-size: 42px;
    color: var(--primary-light);
    margin-bottom: 14px;
}

.drop-text {
    font-size: 15px;
    font-weight: 600;
    margin-bottom: 6px;
}

.drop-sub {
    font-size: 13px;
    color: var(--text-muted);
}

.preview-box {
    margin-top: 24px;
    padding: 20px;
    background: var(--surface);
    border-radius: var(--radius-md);
    border: 1px solid var(--card-border);
    display: none;
}

/* Footer */
.footer {
    border-top: 1px solid var(--card-border);
    padding: 40px 24px;
    text-align: center;
    color: var(--text-muted);
    font-size: 14px;
    margin-top: 60px;
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: 24px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}

.footer-links a {
    color: var(--text-muted);
    text-decoration: none;
    transition: color 0.2s ease;
}

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

@media (max-width: 640px) {
    .header {
        padding: 14px 20px;
    }
    .container {
        padding: 24px 16px;
    }
    .util-card {
        padding: 24px 16px;
    }
}