/* ============================================
   SpeakerDryer.net - Premium Redesign
   Aurora/Gradient Glass Theme
   ============================================ */

/* CSS Variables - Beautiful Color System */
:root {
    /* Background Colors - Deep Space */
    --color-bg-primary: #0f0f23;
    --color-bg-secondary: #1a1a2e;
    --color-bg-card: rgba(30, 30, 60, 0.6);
    --color-bg-elevated: rgba(40, 40, 80, 0.5);

    /* Aurora Gradient Colors */
    --color-aurora-1: #ff6b6b;
    --color-aurora-2: #feca57;
    --color-aurora-3: #48dbfb;
    --color-aurora-4: #ff9ff3;
    --color-aurora-5: #54a0ff;
    --color-aurora-6: #5f27cd;

    /* Accent Colors */
    --color-accent-primary: #48dbfb;
    --color-accent-secondary: #ff6b6b;
    --color-accent-tertiary: #00d2d3;
    --color-accent-warm: #ff9f43;
    --color-accent-cool: #a29bfe;

    /* Text Colors */
    --color-text-primary: #ffffff;
    --color-text-secondary: #e0e0e0;
    --color-text-muted: #a0a0c0;

    /* Glass Effect */
    --glass-bg: rgba(255, 255, 255, 0.05);
    --glass-border: rgba(255, 255, 255, 0.1);
    --glass-border-hover: rgba(255, 255, 255, 0.2);

    /* Beautiful Gradients */
    --gradient-aurora: linear-gradient(135deg, #ff6b6b 0%, #feca57 25%, #48dbfb 50%, #ff9ff3 75%, #54a0ff 100%);
    --gradient-sunset: linear-gradient(135deg, #ff6b6b 0%, #ff9f43 50%, #feca57 100%);
    --gradient-ocean: linear-gradient(135deg, #48dbfb 0%, #54a0ff 50%, #5f27cd 100%);
    --gradient-candy: linear-gradient(135deg, #ff9ff3 0%, #f368e0 50%, #ff6b6b 100%);
    --gradient-mint: linear-gradient(135deg, #00d2d3 0%, #48dbfb 50%, #54a0ff 100%);
    --gradient-button: linear-gradient(135deg, #48dbfb 0%, #00d2d3 50%, #54a0ff 100%);

    /* Shadows */
    --shadow-sm: 0 4px 15px rgba(0, 0, 0, 0.2);
    --shadow-md: 0 8px 30px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 15px 50px rgba(0, 0, 0, 0.4);
    --shadow-glow-cyan: 0 0 30px rgba(72, 219, 251, 0.4);
    --shadow-glow-pink: 0 0 30px rgba(255, 107, 107, 0.4);
    --shadow-glow-rainbow: 0 0 40px rgba(72, 219, 251, 0.3), 0 0 80px rgba(255, 107, 107, 0.2);

    /* Typography */
    --font-display: 'Orbitron', sans-serif;
    --font-body: 'Inter', sans-serif;

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;

    /* Border Radius */
    --radius-sm: 12px;
    --radius-md: 16px;
    --radius-lg: 24px;
    --radius-xl: 32px;
    --radius-full: 9999px;

    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 300ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 500ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* ============================================
   Reset & Base Styles
   ============================================ */

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-body);
    background: var(--color-bg-primary);
    color: var(--color-text-primary);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
    position: relative;
}

/* Animated Aurora Background */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background:
        radial-gradient(ellipse at 10% 20%, rgba(255, 107, 107, 0.15) 0%, transparent 50%),
        radial-gradient(ellipse at 90% 80%, rgba(72, 219, 251, 0.15) 0%, transparent 50%),
        radial-gradient(ellipse at 50% 50%, rgba(255, 159, 243, 0.1) 0%, transparent 60%),
        radial-gradient(ellipse at 80% 20%, rgba(254, 202, 87, 0.1) 0%, transparent 40%);
    animation: aurora-shift 15s ease-in-out infinite alternate;
    pointer-events: none;
    z-index: -1;
}

@keyframes aurora-shift {
    0% {
        filter: hue-rotate(0deg);
        opacity: 1;
    }

    50% {
        opacity: 0.8;
    }

    100% {
        filter: hue-rotate(30deg);
        opacity: 1;
    }
}

/* Floating Particles Effect */
body::after {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image:
        radial-gradient(2px 2px at 20px 30px, rgba(255, 255, 255, 0.3), transparent),
        radial-gradient(2px 2px at 40px 70px, rgba(255, 255, 255, 0.2), transparent),
        radial-gradient(2px 2px at 50px 160px, rgba(255, 255, 255, 0.3), transparent),
        radial-gradient(2px 2px at 90px 40px, rgba(255, 255, 255, 0.2), transparent),
        radial-gradient(2px 2px at 130px 80px, rgba(255, 255, 255, 0.3), transparent),
        radial-gradient(2px 2px at 160px 120px, rgba(255, 255, 255, 0.2), transparent);
    background-size: 200px 200px;
    animation: particles-float 20s linear infinite;
    pointer-events: none;
    z-index: -1;
    opacity: 0.5;
}

@keyframes particles-float {
    0% {
        transform: translateY(0);
    }

    100% {
        transform: translateY(-200px);
    }
}

/* ============================================
   Container
   ============================================ */

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* ============================================
   Header - Glass Morphism
   ============================================ */

/* ============================================
   Header - Premium Redesign
   ============================================ */

.header {
    padding: var(--spacing-md) 0;
    background: rgba(15, 15, 35, 0.8);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--glass-border);
    position: sticky;
    top: 0;
    z-index: 1000;
    transition: all var(--transition-base);
}

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

.logo {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 900;
    margin: 0;
    flex-shrink: 0;
}

.logo-text {
    letter-spacing: 2px;
    text-transform: uppercase;
    background: var(--gradient-aurora);
    background-size: 300% 300%;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: gradient-flow 8s ease infinite;
}

@keyframes gradient-flow {

    0%,
    100% {
        background-position: 0% 50%;
    }

    50% {
        background-position: 100% 50%;
    }
}

/* Nav Menu */
.nav-menu {
    display: flex;
    gap: var(--spacing-lg);
    align-items: center;
    margin: 0 var(--spacing-lg);
}

.nav-link {
    color: var(--color-text-secondary);
    text-decoration: none;
    font-size: 0.95rem;
    font-weight: 500;
    transition: all var(--transition-fast);
    position: relative;
    padding: 4px 0;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient-ocean);
    transition: width var(--transition-fast);
}

.nav-link:hover {
    color: var(--color-text-primary);
    text-shadow: 0 0 10px rgba(72, 219, 251, 0.4);
}

.nav-link:hover::after {
    width: 100%;
}

/* Header CTA */
.header-cta {
    background: var(--gradient-button);
    border: none;
    border-radius: var(--radius-full);
    padding: 10px 24px;
    color: var(--color-text-primary);
    font-family: var(--font-body);
    font-weight: 600;
    font-size: 0.9rem;
    cursor: pointer;
    transition: all var(--transition-base);
    box-shadow: 0 4px 15px rgba(72, 219, 251, 0.3);
    white-space: nowrap;
}

.header-cta:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(72, 219, 251, 0.5);
    filter: brightness(1.1);
}

/* Mobile Responsive */
@media (max-width: 768px) {
    .nav-menu {
        display: none;
    }

    .header-cta {
        padding: 8px 16px;
        font-size: 0.85rem;
    }

    .logo {
        font-size: 1.2rem;
    }
}

/* ============================================
   Main App Section
   ============================================ */

.main-app {
    padding: var(--spacing-2xl) 0;
}

/* Status Card - Glass Effect */
.status-card {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    text-align: center;
    margin-bottom: var(--spacing-xl);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

.status-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--gradient-aurora);
    background-size: 300% 100%;
    animation: gradient-flow 5s ease infinite;
}

.status-card:hover {
    border-color: var(--glass-border-hover);
    transform: translateY(-4px);
    box-shadow: var(--shadow-glow-rainbow);
}

.status-icon {
    font-size: 4rem;
    margin-bottom: var(--spacing-sm);
    animation: pulse-scale 2.5s ease-in-out infinite;
}

@keyframes pulse-scale {

    0%,
    100% {
        transform: scale(1);
    }

    50% {
        transform: scale(1.1);
    }
}

.status-title {
    font-family: var(--font-display);
    font-size: 1.6rem;
    margin-bottom: var(--spacing-xs);
    background: var(--gradient-ocean);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.status-text {
    color: var(--color-text-secondary);
    font-size: 1rem;
}

/* ============================================
   EPIC Eject Button - The Star of the Show
   ============================================ */

.eject-section {
    display: flex;
    justify-content: center;
    margin-bottom: var(--spacing-xl);
    perspective: 1000px;
}

.eject-button {
    position: relative;
    width: 300px;
    height: 300px;
    border-radius: 50%;
    border: none;
    background: var(--gradient-button);
    color: var(--color-text-primary);
    font-family: var(--font-display);
    font-size: 1.6rem;
    font-weight: 900;
    cursor: pointer;
    overflow: visible;
    box-shadow:
        0 0 0 8px rgba(72, 219, 251, 0.1),
        0 0 40px rgba(72, 219, 251, 0.4),
        0 0 80px rgba(0, 210, 211, 0.2),
        inset 0 -10px 30px rgba(0, 0, 0, 0.3);
    transition: all var(--transition-base);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
    animation: button-breathe 4s ease-in-out infinite;
}

@keyframes button-breathe {

    0%,
    100% {
        box-shadow:
            0 0 0 8px rgba(72, 219, 251, 0.1),
            0 0 40px rgba(72, 219, 251, 0.4),
            0 0 80px rgba(0, 210, 211, 0.2),
            inset 0 -10px 30px rgba(0, 0, 0, 0.3);
    }

    50% {
        box-shadow:
            0 0 0 12px rgba(72, 219, 251, 0.15),
            0 0 60px rgba(72, 219, 251, 0.5),
            0 0 100px rgba(0, 210, 211, 0.3),
            inset 0 -10px 30px rgba(0, 0, 0, 0.3);
    }
}

/* Outer Ring Animation */
.eject-button::before {
    content: '';
    position: absolute;
    top: -15px;
    left: -15px;
    right: -15px;
    bottom: -15px;
    border-radius: 50%;
    border: 3px solid transparent;
    background: var(--gradient-aurora) border-box;
    -webkit-mask: linear-gradient(#fff 0 0) padding-box, linear-gradient(#fff 0 0);
    mask: linear-gradient(#fff 0 0) padding-box, linear-gradient(#fff 0 0);
    -webkit-mask-composite: xor;
    mask-composite: exclude;
    animation: ring-rotate 8s linear infinite;
    opacity: 0.6;
}

@keyframes ring-rotate {
    0% {
        transform: rotate(0deg);
    }

    100% {
        transform: rotate(360deg);
    }
}

/* Inner Shine Effect */
.eject-button::after {
    content: '';
    position: absolute;
    top: 10%;
    left: 15%;
    width: 70%;
    height: 40%;
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.3) 0%, transparent 100%);
    border-radius: 50%;
    pointer-events: none;
}

.eject-button:hover {
    transform: scale(1.08) translateY(-5px);
    box-shadow:
        0 0 0 15px rgba(72, 219, 251, 0.15),
        0 0 80px rgba(72, 219, 251, 0.6),
        0 0 120px rgba(0, 210, 211, 0.4),
        0 20px 60px rgba(0, 0, 0, 0.4),
        inset 0 -10px 30px rgba(0, 0, 0, 0.3);
}

.eject-button:active {
    transform: scale(0.98);
}

.eject-button.active {
    background: var(--gradient-candy);
    animation: button-active-pulse 0.6s ease-in-out infinite;
}

@keyframes button-active-pulse {

    0%,
    100% {
        transform: scale(1);
        box-shadow:
            0 0 0 10px rgba(255, 107, 107, 0.2),
            0 0 60px rgba(255, 107, 107, 0.5),
            0 0 100px rgba(255, 159, 243, 0.3),
            inset 0 -10px 30px rgba(0, 0, 0, 0.3);
    }

    50% {
        transform: scale(1.05);
        box-shadow:
            0 0 0 15px rgba(255, 107, 107, 0.3),
            0 0 80px rgba(255, 107, 107, 0.6),
            0 0 140px rgba(255, 159, 243, 0.4),
            inset 0 -10px 30px rgba(0, 0, 0, 0.3);
    }
}

.button-ripple {
    position: absolute;
    top: 50%;
    left: 50%;
    width: 100%;
    height: 100%;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(255, 255, 255, 0.4) 0%, transparent 70%);
    transform: translate(-50%, -50%) scale(0);
    opacity: 0;
    pointer-events: none;
}

.eject-button.active .button-ripple {
    animation: ripple-wave 1.2s ease-out infinite;
}

@keyframes ripple-wave {
    0% {
        transform: translate(-50%, -50%) scale(0.5);
        opacity: 1;
    }

    100% {
        transform: translate(-50%, -50%) scale(2);
        opacity: 0;
    }
}

.button-text {
    position: relative;
    z-index: 2;
    letter-spacing: 3px;
}

.button-frequency {
    position: relative;
    z-index: 2;
    font-size: 1.1rem;
    opacity: 0.9;
    font-weight: 500;
    background: rgba(255, 255, 255, 0.2);
    padding: 4px 16px;
    border-radius: var(--radius-full);
}

/* ============================================
   Mode Toggle - Pill Style
   ============================================ */

.mode-toggle {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    margin-bottom: var(--spacing-xl);
    flex-wrap: wrap;
}

.mode-btn {
    background: var(--glass-bg);
    backdrop-filter: blur(15px);
    -webkit-backdrop-filter: blur(15px);
    border: 2px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md) var(--spacing-lg);
    cursor: pointer;
    transition: all var(--transition-base);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-xs);
    color: var(--color-text-secondary);
    min-width: 180px;
}

.mode-btn:hover {
    border-color: var(--glass-border-hover);
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
    color: var(--color-text-primary);
}

.mode-btn.active {
    border-color: var(--color-accent-primary);
    background: linear-gradient(135deg, rgba(72, 219, 251, 0.15) 0%, rgba(84, 160, 255, 0.1) 100%);
    box-shadow: var(--shadow-glow-cyan);
    color: var(--color-text-primary);
}

.mode-btn.active[data-mode="dust"] {
    border-color: var(--color-accent-secondary);
    background: linear-gradient(135deg, rgba(255, 107, 107, 0.15) 0%, rgba(255, 159, 67, 0.1) 100%);
    box-shadow: var(--shadow-glow-pink);
}

.mode-icon {
    font-size: 2.2rem;
    filter: grayscale(0.3);
    transition: all var(--transition-base);
}

.mode-btn:hover .mode-icon,
.mode-btn.active .mode-icon {
    filter: grayscale(0);
    transform: scale(1.1);
}

.mode-label {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 1.05rem;
    letter-spacing: 1px;
}

.mode-desc {
    font-size: 0.85rem;
    color: var(--color-text-muted);
    opacity: 0.8;
}

/* ============================================
   Visualizer - Beautiful Wave Display
   ============================================ */

.visualizer-container {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-xl);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
    box-shadow: var(--shadow-md);
    overflow: hidden;
    position: relative;
}

.visualizer-container::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(45deg,
            rgba(72, 219, 251, 0.05) 0%,
            rgba(255, 107, 107, 0.05) 50%,
            rgba(255, 159, 243, 0.05) 100%);
    pointer-events: none;
}

#visualizer {
    width: 100%;
    height: auto;
    display: block;
    border-radius: var(--radius-md);
    position: relative;
    z-index: 1;
}

/* ============================================
   Control Panel - Sleek Design
   ============================================ */

.control-panel {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
    box-shadow: var(--shadow-md);
}

.control-title {
    font-family: var(--font-display);
    font-size: 1.3rem;
    margin-bottom: var(--spacing-lg);
    text-align: center;
    background: var(--gradient-mint);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: 2px;
}

.frequency-display {
    display: flex;
    align-items: baseline;
    justify-content: center;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-lg);
}

.frequency-value {
    font-family: var(--font-display);
    font-size: 4rem;
    font-weight: 900;
    background: var(--gradient-aurora);
    background-size: 300% 300%;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: gradient-flow 5s ease infinite;
    text-shadow: 0 0 30px rgba(72, 219, 251, 0.3);
}

.frequency-unit {
    font-size: 1.8rem;
    color: var(--color-text-muted);
    font-weight: 300;
}

/* Custom Range Slider */
.frequency-slider {
    width: 100%;
    height: 12px;
    border-radius: var(--radius-full);
    background: linear-gradient(90deg,
            rgba(72, 219, 251, 0.3) 0%,
            rgba(255, 107, 107, 0.3) 100%);
    outline: none;
    -webkit-appearance: none;
    appearance: none;
    margin-bottom: var(--spacing-sm);
    box-shadow: inset 0 2px 5px rgba(0, 0, 0, 0.3);
}

.frequency-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: var(--gradient-aurora);
    cursor: pointer;
    box-shadow:
        0 0 20px rgba(72, 219, 251, 0.5),
        0 4px 15px rgba(0, 0, 0, 0.3);
    transition: all var(--transition-fast);
    border: 3px solid rgba(255, 255, 255, 0.3);
}

.frequency-slider::-webkit-slider-thumb:hover {
    transform: scale(1.2);
    box-shadow:
        0 0 35px rgba(72, 219, 251, 0.7),
        0 6px 20px rgba(0, 0, 0, 0.4);
}

.frequency-slider::-moz-range-thumb {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: var(--gradient-aurora);
    cursor: pointer;
    border: 3px solid rgba(255, 255, 255, 0.3);
    box-shadow:
        0 0 20px rgba(72, 219, 251, 0.5),
        0 4px 15px rgba(0, 0, 0, 0.3);
    transition: all var(--transition-fast);
}

.frequency-slider::-moz-range-thumb:hover {
    transform: scale(1.2);
}

.slider-labels {
    display: flex;
    justify-content: space-between;
    font-size: 0.9rem;
    color: var(--color-text-muted);
    font-weight: 500;
}

/* ============================================
   Stereo Test - Modern Cards
   ============================================ */

.stereo-test {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
    box-shadow: var(--shadow-md);
}

.stereo-buttons {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-md);
}

.stereo-btn {
    background: linear-gradient(135deg, rgba(0, 210, 211, 0.1) 0%, rgba(72, 219, 251, 0.05) 100%);
    border: 2px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    cursor: pointer;
    transition: all var(--transition-base);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
    color: var(--color-text-primary);
    font-family: var(--font-display);
}

.stereo-btn:hover {
    border-color: var(--color-accent-tertiary);
    transform: translateY(-4px);
    box-shadow: 0 0 30px rgba(0, 210, 211, 0.3);
    background: linear-gradient(135deg, rgba(0, 210, 211, 0.2) 0%, rgba(72, 219, 251, 0.1) 100%);
}

.stereo-btn:active {
    transform: scale(0.98);
    box-shadow: 0 0 50px rgba(0, 210, 211, 0.5);
}

.stereo-icon {
    font-size: 2.5rem;
    background: var(--gradient-mint);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stereo-label {
    font-size: 1rem;
    letter-spacing: 1px;
}

/* ============================================
   Install Prompt - Floating Card
   ============================================ */

.install-prompt {
    position: fixed;
    bottom: var(--spacing-lg);
    left: var(--spacing-lg);
    right: var(--spacing-lg);
    max-width: 500px;
    margin: 0 auto;
    background: var(--glass-bg);
    backdrop-filter: blur(25px);
    -webkit-backdrop-filter: blur(25px);
    border: 2px solid var(--glass-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    z-index: 1000;
    animation: slide-in-up 0.5s cubic-bezier(0.4, 0, 0.2, 1);
    overflow: hidden;
}

.install-prompt::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--gradient-candy);
}

@keyframes slide-in-up {
    from {
        transform: translateY(120%);
        opacity: 0;
    }

    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.install-content {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md) var(--spacing-lg);
}

.install-icon {
    font-size: 2rem;
}

.install-text {
    flex: 1;
    font-size: 1rem;
    font-weight: 500;
}

.install-btn {
    background: var(--gradient-candy);
    border: none;
    border-radius: var(--radius-sm);
    padding: var(--spacing-sm) var(--spacing-lg);
    color: var(--color-text-primary);
    font-family: var(--font-display);
    font-weight: 700;
    cursor: pointer;
    transition: all var(--transition-base);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.install-btn:hover {
    transform: scale(1.05);
    box-shadow: 0 0 25px rgba(255, 107, 107, 0.5);
}

.install-close {
    background: transparent;
    border: none;
    color: var(--color-text-muted);
    font-size: 1.5rem;
    cursor: pointer;
    padding: var(--spacing-xs);
    transition: all var(--transition-fast);
    line-height: 1;
}

.install-close:hover {
    color: var(--color-text-primary);
    transform: rotate(90deg);
}

/* ============================================
   Content Section (SEO)
   ============================================ */

.content-section {
    background: linear-gradient(180deg, var(--color-bg-secondary) 0%, var(--color-bg-primary) 100%);
    padding: var(--spacing-2xl) 0;
    border-top: 1px solid var(--glass-border);
}

.content-article {
    max-width: 800px;
    margin: 0 auto;
}

.content-article h2 {
    font-family: var(--font-display);
    font-size: 2.2rem;
    margin-bottom: var(--spacing-md);
    background: var(--gradient-sunset);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-top: var(--spacing-2xl);
    letter-spacing: 1px;
}

.content-article h2:first-child {
    margin-top: 0;
}

.content-article h3 {
    font-family: var(--font-display);
    font-size: 1.5rem;
    margin-bottom: var(--spacing-sm);
    margin-top: var(--spacing-xl);
    background: var(--gradient-mint);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.content-article p {
    margin-bottom: var(--spacing-md);
    color: var(--color-text-secondary);
    line-height: 1.9;
    font-size: 1.05rem;
}

.instruction-list,
.feature-list {
    margin-bottom: var(--spacing-md);
    padding-left: var(--spacing-lg);
}

.instruction-list li,
.feature-list li {
    margin-bottom: var(--spacing-sm);
    color: var(--color-text-secondary);
    line-height: 1.9;
    font-size: 1.05rem;
}

.instruction-list strong {
    background: var(--gradient-ocean);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* ============================================
   Footer
   ============================================ */

.footer {
    padding: var(--spacing-2xl) 0 var(--spacing-lg);
    background: linear-gradient(180deg, var(--color-bg-primary) 0%, #000000 100%);
    border-top: 1px solid var(--glass-border);
    position: relative;
    overflow: hidden;
}

/* Footer Grid */
.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-2xl);
}

.footer-col {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.brand-col {
    padding-right: var(--spacing-xl);
}

.footer-logo {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 900;
    margin-bottom: var(--spacing-xs);
    background: var(--gradient-aurora);
    background-size: 300% 300%;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: gradient-flow 10s ease infinite;
    letter-spacing: 1px;
    text-transform: uppercase;
}

.footer-desc {
    color: var(--color-text-secondary);
    font-size: 0.95rem;
    line-height: 1.6;
    opacity: 0.8;
}

.footer-heading {
    font-family: var(--font-display);
    font-size: 1rem;
    font-weight: 700;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-sm);
    letter-spacing: 1px;
    position: relative;
    display: inline-block;
}

.footer-heading::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 0;
    width: 30px;
    height: 2px;
    background: var(--gradient-ocean);
}

.footer-links {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.footer-links a {
    color: var(--color-text-muted);
    text-decoration: none;
    font-size: 0.95rem;
    transition: all var(--transition-fast);
    position: relative;
    display: inline-block;
    width: fit-content;
}

.footer-links a:hover {
    color: var(--color-accent-primary);
    transform: translateX(5px);
    text-shadow: 0 0 10px rgba(72, 219, 251, 0.4);
}

/* Footer Bottom */
.footer-bottom {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.footer-line {
    width: 100%;
    height: 1px;
    background: linear-gradient(90deg,
            transparent 0%,
            rgba(255, 255, 255, 0.1) 20%,
            rgba(255, 255, 255, 0.1) 80%,
            transparent 100%);
}

.footer-bottom-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.footer-copyright {
    color: var(--color-text-muted);
    font-size: 0.9rem;
}

.footer-disclaimer {
    color: var(--color-text-muted);
    font-size: 0.85rem;
    opacity: 0.6;
}

/* Search engine indexing text hidden visually */
.seo-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    border: 0;
}

/* Tablet Responsive */
@media (max-width: 992px) {
    .footer-grid {
        grid-template-columns: 1fr 1fr;
        gap: var(--spacing-lg);
    }

    .brand-col {
        grid-column: 1 / -1;
        padding-right: 0;
        text-align: center;
        align-items: center;
    }

    .footer-heading::after {
        left: 50%;
        transform: translateX(-50%);
    }

    .footer-col {
        align-items: center;
        text-align: center;
    }
}

/* Mobile Responsive */
@media (max-width: 576px) {
    .footer-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-xl);
    }

    .footer-bottom-content {
        flex-direction: column;
        text-align: center;
    }
}

@media (max-width: 768px) {
    .logo {
        font-size: 1.3rem;
    }

    .header-cta {
        padding: 8px 16px;
        font-size: 0.85rem;
    }

    .eject-button {
        width: 260px;
        height: 260px;
        font-size: 1.4rem;
    }

    .mode-toggle {
        flex-direction: column;
        align-items: center;
        gap: var(--spacing-sm);
    }

    .mode-btn {
        width: 100%;
        max-width: 320px;
        flex-direction: row;
        justify-content: center;
        padding: var(--spacing-sm);
        min-height: 60px;
    }

    .mode-icon {
        font-size: 1.5rem;
    }

    .mode-btn .mode-desc {
        display: none;
    }

    .stereo-buttons {
        grid-template-columns: 1fr;
    }

    .frequency-value {
        font-size: 3rem;
    }

    .content-article h2 {
        font-size: 1.8rem;
    }

    .content-article h3 {
        font-size: 1.3rem;
    }

    .install-content {
        flex-wrap: wrap;
        text-align: center;
        justify-content: center;
    }

    .install-text {
        width: 100%;
        margin-bottom: var(--spacing-xs);
    }
}

@media (max-width: 480px) {
    .header-container {
        justify-content: space-between;
        gap: var(--spacing-xs);
    }

    .logo {
        font-size: 1rem;
        flex: 1;
        white-space: nowrap;
        overflow: hidden;
        text-overflow: ellipsis;
    }

    .logo-text {
        letter-spacing: 0;
    }

    .header-cta {
        padding: 6px 12px;
        font-size: 0.75rem;
        flex-shrink: 0;
    }

    .main-app {
        padding: var(--spacing-lg) 0;
    }

    .status-card {
        padding: var(--spacing-md);
        margin-bottom: var(--spacing-lg);
        border-radius: var(--radius-lg);
    }

    .status-icon {
        font-size: 2.5rem;
        margin-bottom: var(--spacing-xs);
    }

    .status-title {
        font-size: 1.2rem;
        line-height: 1.3;
    }

    .status-text {
        font-size: 0.9rem;
    }

    .eject-section {
        margin-bottom: var(--spacing-lg);
    }

    .eject-button {
        width: 220px;
        height: 220px;
        font-size: 1.1rem;
        box-shadow:
            0 0 0 4px rgba(72, 219, 251, 0.1),
            0 0 20px rgba(72, 219, 251, 0.4),
            0 0 40px rgba(0, 210, 211, 0.2),
            inset 0 -5px 15px rgba(0, 0, 0, 0.3);
    }

    .button-frequency {
        font-size: 0.8rem;
        padding: 2px 10px;
    }

    .control-panel,
    .stereo-test {
        padding: var(--spacing-md);
        border-radius: var(--radius-lg);
    }

    .frequency-display {
        margin-bottom: var(--spacing-md);
    }

    .control-title {
        font-size: 1.1rem;
        margin-bottom: var(--spacing-md);
    }
}

/* ============================================
   Smooth Scrollbar (Webkit)
   ============================================ */

::-webkit-scrollbar {
    width: 10px;
}

::-webkit-scrollbar-track {
    background: var(--color-bg-primary);
}

::-webkit-scrollbar-thumb {
    background: var(--gradient-ocean);
    border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--gradient-aurora);
}

/* ============================================
   Selection Highlight
   ============================================ */

::selection {
    background: rgba(72, 219, 251, 0.3);
    color: var(--color-text-primary);
}

::-moz-selection {
    background: rgba(72, 219, 251, 0.3);
    color: var(--color-text-primary);
}