:root {
    --bg-abyss: #06070B;
    --matrix-slate: rgba(18, 16, 28, 0.85);
    --neon-ultraviolet: #7B2CBF;
    --laser-amethyst: #C77DFF;
    --pulse-cyan: #00F2FE;
    --error-glitch: #FF0055;
    --pure-light: #FFFFFF;
    --text-muted: #8E8A9F;
    --lane-bg: rgba(11, 9, 18, 0.7);
    --border-subtle: rgba(199, 125, 255, 0.15);
    --font-title: 'Cinzel', serif;
    --font-mono: 'Space Grotesk', monospace;
    --font-body: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, sans-serif;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    -webkit-tap-highlight-color: transparent;
    user-select: none;
    -webkit-user-select: none;
}

html, body {
    width: 100%;
    height: 100%;
    overflow: hidden;
    background-color: var(--bg-abyss);
    color: var(--pure-light);
    font-family: var(--font-body);
    font-size: 14px;
    touch-action: manipulation;
}

body {
    display: flex;
    flex-direction: column;
    position: fixed;
    inset: 0;
}

/* Background Atmosphere */
.app-atmosphere {
    position: absolute;
    inset: 0;
    pointer-events: none;
    z-index: 0;
    background: 
        radial-gradient(circle at 50% 15%, rgba(123, 44, 191, 0.22) 0%, transparent 60%),
        radial-gradient(circle at 80% 80%, rgba(0, 242, 254, 0.12) 0%, transparent 50%),
        radial-gradient(circle at 20% 90%, rgba(199, 125, 255, 0.1) 0%, transparent 50%);
}

.ambient-grid {
    position: absolute;
    inset: 0;
    background-image: 
        linear-gradient(rgba(199, 125, 255, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(199, 125, 255, 0.03) 1px, transparent 1px);
    background-size: 32px 32px;
}

/* App Container */
.app-container {
    position: relative;
    z-index: 1;
    width: 100%;
    height: 100%;
    max-width: 480px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    padding-top: max(env(safe-area-inset-top, 0px), 18px);
    padding-bottom: max(env(safe-area-inset-bottom, 0px), 12px);
    padding-left: max(env(safe-area-inset-left, 0px), 0px);
    padding-right: max(env(safe-area-inset-right, 0px), 0px);
}

/* Header */
.app-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 16px;
    border-bottom: 1px solid var(--border-subtle);
    background: rgba(6, 7, 11, 0.7);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    flex-shrink: 0;
    z-index: 10;
}

.brand-section {
    display: flex;
    align-items: center;
    gap: 8px;
}

.brand-badge {
    width: 26px;
    height: 26px;
    border-radius: 6px;
    border: 1px solid var(--laser-amethyst);
    background: linear-gradient(135deg, var(--neon-ultraviolet), #240046);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 0 10px rgba(123, 44, 191, 0.5);
}

.brand-symbol-svg {
    width: 16px;
    height: 16px;
    stroke: var(--pure-light);
    fill: none;
}

.brand-title {
    font-family: var(--font-title);
    font-size: 15px;
    letter-spacing: 2px;
    font-weight: 700;
    color: var(--pure-light);
    text-transform: uppercase;
}

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

.fever-status-pill {
    padding: 3px 8px;
    border-radius: 12px;
    font-size: 10px;
    font-family: var(--font-mono);
    letter-spacing: 1px;
    text-transform: uppercase;
    background: rgba(123, 44, 191, 0.2);
    border: 1px solid var(--border-subtle);
    color: var(--text-muted);
    transition: all 0.3s ease;
}

.fever-status-pill.active {
    background: rgba(0, 242, 254, 0.2);
    border-color: var(--pulse-cyan);
    color: var(--pulse-cyan);
    box-shadow: 0 0 12px rgba(0, 242, 254, 0.6);
    animation: feverPulse 1s infinite alternate;
}

@keyframes feverPulse {
    from { transform: scale(1); filter: drop-shadow(0 0 4px var(--pulse-cyan)); }
    to { transform: scale(1.05); filter: drop-shadow(0 0 10px var(--pulse-cyan)); }
}

.audio-toggle-btn {
    background: transparent;
    border: 1px solid var(--border-subtle);
    color: var(--laser-amethyst);
    width: 32px;
    height: 32px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.2s;
}

.audio-toggle-btn:active {
    transform: scale(0.92);
}

.audio-glyph {
    width: 16px;
    height: 16px;
    fill: currentColor;
}

/* Tab Screens Management */
.main-stage {
    flex: 1;
    position: relative;
    overflow: hidden;
    display: flex;
}

.view-pane {
    position: absolute;
    inset: 0;
    display: none;
    flex-direction: column;
    overflow: hidden;
}

.view-pane.active {
    display: flex;
}

/* Bottom Navigation Dock */
.nav-dock {
    height: 56px;
    border-top: 1px solid var(--border-subtle);
    background: rgba(6, 7, 11, 0.92);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    flex-shrink: 0;
    z-index: 10;
}

.nav-tab-btn {
    background: transparent;
    border: none;
    color: var(--text-muted);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 4px;
    cursor: pointer;
    font-family: var(--font-mono);
    font-size: 10px;
    letter-spacing: 1px;
    transition: all 0.2s ease;
}

.nav-tab-btn .nav-glyph {
    width: 18px;
    height: 18px;
    stroke: currentColor;
    fill: none;
    stroke-width: 2;
    transition: stroke 0.2s ease, transform 0.2s ease;
}

.nav-tab-btn.active {
    color: var(--pulse-cyan);
}

.nav-tab-btn.active .nav-glyph {
    stroke: var(--pulse-cyan);
    transform: translateY(-2px);
    filter: drop-shadow(0 0 6px rgba(0, 242, 254, 0.7));
}

/* Modals */
.overlay-modal {
    position: fixed;
    inset: 0;
    background: rgba(6, 7, 11, 0.88);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    z-index: 100;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
}

.overlay-modal.active {
    opacity: 1;
    pointer-events: auto;
}

.modal-dialog {
    background: linear-gradient(180deg, rgba(25, 20, 40, 0.95), rgba(11, 9, 18, 0.98));
    border: 1px solid var(--laser-amethyst);
    box-shadow: 0 0 30px rgba(123, 44, 191, 0.4), inset 0 0 20px rgba(0, 242, 254, 0.08);
    border-radius: 16px;
    width: 100%;
    max-width: 360px;
    padding: 24px 20px;
    text-align: center;
    transform: scale(0.92);
    transition: transform 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.overlay-modal.active .modal-dialog {
    transform: scale(1);
}

/* Onboarding / Loading Screen */
.onboarding-screen {
    position: fixed;
    inset: 0;
    z-index: 1000;
    background: #06070B;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: max(env(safe-area-inset-top, 0px), 24px) 24px max(env(safe-area-inset-bottom, 0px), 24px) 24px;
    opacity: 1;
    transition: opacity 0.5s cubic-bezier(0.4, 0, 0.2, 1);
    pointer-events: auto;
}

.onboarding-screen.dismissed {
    opacity: 0;
    pointer-events: none;
}

.onboarding-graphic-wrap {
    width: 130px;
    height: 130px;
    border-radius: 50%;
    background: #120E1C;
    border: 2px solid var(--laser-amethyst);
    box-shadow: 0 0 35px rgba(123, 44, 191, 0.55), inset 0 0 15px rgba(0, 242, 254, 0.2);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 12px;
    margin-bottom: 24px;
    animation: onboardingPulse 2s infinite ease-in-out;
}

.onboarding-graphic-svg {
    width: 72px;
    height: 72px;
    filter: drop-shadow(0 0 10px var(--pulse-cyan));
}

@keyframes onboardingPulse {
    0%, 100% { transform: scale(1); box-shadow: 0 0 25px rgba(123, 44, 191, 0.45); }
    50% { transform: scale(1.06); box-shadow: 0 0 45px rgba(0, 242, 254, 0.65); }
}

.onboarding-title {
    font-family: var(--font-title);
    font-size: 24px;
    font-weight: 700;
    letter-spacing: 4px;
    color: var(--pure-light);
    text-transform: uppercase;
    text-align: center;
    margin-bottom: 6px;
    text-shadow: 0 0 16px rgba(199, 125, 255, 0.5);
}

.onboarding-subtitle {
    font-family: var(--font-mono);
    font-size: 11px;
    color: var(--pulse-cyan);
    letter-spacing: 2px;
    text-transform: uppercase;
    text-align: center;
    margin-bottom: 28px;
}

.onboarding-progress-track {
    width: 230px;
    height: 6px;
    background: #161224;
    border-radius: 3px;
    overflow: hidden;
    margin-bottom: 12px;
    box-shadow: inset 0 1px 3px rgba(0,0,0,0.8);
}

.onboarding-progress-fill {
    width: 0%;
    height: 100%;
    background: linear-gradient(90deg, var(--neon-ultraviolet), var(--pulse-cyan));
    border-radius: 3px;
    transition: width 0.15s linear;
    box-shadow: 0 0 12px var(--pulse-cyan);
}

.onboarding-status {
    font-family: var(--font-mono);
    font-size: 10px;
    color: var(--text-muted);
    letter-spacing: 1.5px;
    text-transform: uppercase;
    text-align: center;
}

/* 3-2-1 Countdown Overlay */
.game-countdown-overlay {
    position: absolute;
    inset: 0;
    z-index: 50;
    display: none;
    align-items: center;
    justify-content: center;
    background: rgba(6, 7, 11, 0.65);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    pointer-events: auto;
}

.game-countdown-overlay.active {
    display: flex;
}

.countdown-number {
    font-family: var(--font-title);
    font-size: 96px;
    font-weight: 700;
    color: var(--pulse-cyan);
    text-shadow: 0 0 35px var(--pulse-cyan), 0 0 70px rgba(0, 242, 254, 0.4);
    animation: countdownScale 0.9s cubic-bezier(0.175, 0.885, 0.32, 1.275) infinite;
    letter-spacing: 2px;
}

.countdown-number.go {
    font-size: 80px;
    color: var(--laser-amethyst);
    text-shadow: 0 0 35px var(--laser-amethyst), 0 0 70px rgba(199, 125, 255, 0.5);
}

@keyframes countdownScale {
    0% { transform: scale(1.6); opacity: 0; }
    30% { transform: scale(1); opacity: 1; }
    80% { transform: scale(0.95); opacity: 0.9; }
    100% { transform: scale(0.85); opacity: 0; }
}