:root {
    --sonic-blue: #1A50BC;
    --sonic-gold: #F1B000;
    --sonic-red: #DA2428;
    --sonic-peach: #FFD282;
    --glass-bg: rgba(0, 0, 0, 0.4);
    --glass-border: rgba(255, 255, 255, 0.1);
    --hud-glow: 0 0 20px rgba(26, 80, 188, 0.4);
}

* {
    box-sizing: border-box;
    -webkit-tap-highlight-color: transparent;
    touch-action: none;
}

html, body {
    height: 100%;
    margin: 0;
    padding: 0;
    font-family: 'Oxanium', sans-serif;
    background-color: #000;
    color: #fff;
    overflow: hidden;
}

/* Background & Visual Effects */
.app-background {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    filter: brightness(0.4) saturate(1.2);
    z-index: -2;
    animation: bgPan 40s linear infinite alternate;
}

@keyframes bgPan {
    from { transform: scale(1.1) translateX(-2%); }
    to { transform: scale(1.1) translateX(2%); }
}

.speed-lines {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: repeating-linear-gradient(
        90deg,
        rgba(255,255,255,0.03) 0px,
        rgba(255,255,255,0.03) 1px,
        transparent 1px,
        transparent 100px
    );
    z-index: -1;
    opacity: 0;
    transition: opacity 0.5s;
}

.running .speed-lines {
    opacity: 1;
    animation: speedMove 0.1s linear infinite;
}

@keyframes speedMove {
    from { transform: translateX(0); }
    to { transform: translateX(-100px); }
}

/* Main Layout */
.container {
    height: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
}

.glass-panel {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: 24px;
    padding: 40px;
    width: 320px;
    display: flex;
    flex-direction: column;
    align-items: center;
    box-shadow: var(--hud-glow), inset 0 0 10px rgba(255,255,255,0.05);
    transition: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
}

.glass-panel.wide {
    width: 100%;
    height: 100%;
    border-radius: 0;
    padding: 60px;
    box-shadow: inset 0 0 40px var(--sonic-blue), 0 0 20px rgba(0,0,0,0.5);
    border: none;
}

.stress-level-2 .glass-panel.wide {
    box-shadow: inset 0 0 60px var(--sonic-red), 0 0 20px rgba(0,0,0,0.5) !important;
}

/* HUD Components */
.hud-header {
    width: 100%;
    display: flex;
    justify-content: space-between;
    margin-bottom: 30px;
    font-size: 10px;
    letter-spacing: 2px;
    color: rgba(255,255,255,0.5);
}

.hud-status {
    color: var(--sonic-gold);
    font-weight: 700;
}

.countdown-engine {
    position: relative;
    width: 200px;
    height: 200px;
    display: flex;
    justify-content: center;
    align-items: center;
    margin: 20px 0;
}

/* Progress Ring (SVG) */
.progress-ring {
    position: absolute;
    width: 100%;
    height: 100%;
    transform: rotate(-90deg);
}

.progress-ring__background {
    fill: transparent;
    stroke: rgba(255,255,255,0.05);
    stroke-width: 4;
}

.progress-ring__circle {
    fill: transparent;
    stroke: var(--sonic-blue);
    stroke-width: 6;
    stroke-linecap: round;
    transition: stroke-dashoffset 0.1s linear, stroke 0.3s;
    filter: drop-shadow(0 0 10px var(--sonic-blue)) drop-shadow(0 0 5px var(--sonic-blue));
}

.running .progress-ring__circle {
    stroke: var(--sonic-gold);
    filter: drop-shadow(0 0 15px var(--sonic-gold)) drop-shadow(0 0 5px var(--sonic-gold));
}

/* Stress States (Panic) */
.stress-level-1 #seconds {
    color: var(--sonic-gold);
}

.stress-level-2 .progress-ring__circle {
    stroke: var(--sonic-red) !important;
    filter: drop-shadow(0 0 20px var(--sonic-red)) drop-shadow(0 0 10px var(--sonic-red)) !important;
}

.stress-level-2 #seconds {
    color: var(--sonic-red);
    animation: textPulse 0.5s infinite alternate;
}

@keyframes textPulse {
    from { transform: scale(1); }
    to { transform: scale(1.15); text-shadow: 0 0 15px var(--sonic-red), 0 0 30px var(--sonic-red); }
}

.time-display {
    display: flex;
    flex-direction: column;
    align-items: center;
    z-index: 10;
}

#seconds {
    font-size: 80px;
    font-weight: 700;
    line-height: 1;
    color: #fff;
}

.unit {
    font-size: 14px;
    letter-spacing: 4px;
    color: rgba(255,255,255,0.4);
    margin-top: 5px;
}

/* Footer & Buttons */
.hud-footer {
    width: 100%;
    margin-top: 30px;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.hint-group {
    display: flex;
    flex-direction: column;
    gap: 4px;
    align-items: center;
    opacity: 0.6;
}

.hint {
    font-size: 9px;
    letter-spacing: 1px;
}

.toggle-btn {
    background: transparent;
    border: 1px solid var(--glass-border);
    color: #fff;
    padding: 10px;
    border-radius: 8px;
    font-family: inherit;
    font-size: 10px;
    letter-spacing: 2px;
    cursor: pointer;
    transition: all 0.2s;
    position: relative;
    z-index: 50;
}

.toggle-btn:hover {
    background: rgba(255,255,255,0.1);
    border-color: rgba(255,255,255,0.4);
}

.retry-btn {
    display: none;
    background: var(--sonic-red);
    color: #fff;
    font-weight: 700;
    box-shadow: 0 0 20px var(--sonic-red);
    border: 1px solid rgba(255,255,255,0.4);
    margin-bottom: 10px;
}

.countdown--ended .retry-btn {
    display: block;
    animation: bounceIn 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.countdown--ended #toggle,
.countdown--ended .hint-group {
    display: none;
}

@keyframes bounceIn {
    from { opacity: 0; transform: scale(0.8); }
    to { opacity: 1; transform: scale(1); }
}

/* End State (Game Over) */
.countdown--ended {
    animation: finishedPulse 0.5s infinite alternate;
}

@keyframes finishedPulse {
    from { transform: scale(1); filter: brightness(1); }
    to { transform: scale(1.05); filter: brightness(1.5) drop-shadow(0 0 20px var(--sonic-red)); }
}

.countdown--ended .progress-ring__circle {
    stroke: var(--sonic-red) !important;
}

.countdown--ended #seconds {
    color: #fff;
    text-shadow: 0 0 10px #fff, 0 0 20px var(--sonic-red), 0 0 40px var(--sonic-red);
    animation: neonFlicker 0.15s infinite alternate;
}

@keyframes neonFlicker {
    0% { opacity: 0.8; }
    100% { opacity: 1; }
}

.countdown--ended #status-text {
    color: var(--sonic-red);
    font-weight: 700;
}

body.countdown--ended::after {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle, rgba(218, 36, 40, 0.4) 0%, rgba(0,0,0,0.8) 100%);
    z-index: 100;
    pointer-events: none;
    animation: deathOverlayFade 0.5s ease-out forwards;
}

@keyframes deathOverlayFade {
    from { opacity: 0; }
    to { opacity: 1; }
}