/* SimpleTune - Minimalistic Guitar Tuner */

:root {
    --bg-primary: #0a0a0b;
    --bg-secondary: #141416;
    --bg-tertiary: #1c1c1f;
    --text-primary: #e8e6e3;
    --text-secondary: #7a7875;
    --text-muted: #4a4845;
    --accent: #d4a853;
    --accent-glow: rgba(212, 168, 83, 0.3);
    --success: #5cb85c;
    --success-glow: rgba(92, 184, 92, 0.4);
    --flat: #c9654a;
    --sharp: #5a8fc9;
    --border: #2a2a2d;
}

[data-theme="light"] {
    --bg-primary: #fafafa;
    --bg-secondary: #ffffff;
    --bg-tertiary: #f5f5f5;
    --text-primary: #1a1a1a;
    --text-secondary: #6a6a6a;
    --text-muted: #9a9a9a;
    --accent: #b8944a;
    --accent-glow: rgba(184, 148, 74, 0.2);
    --success: #4a9e4a;
    --success-glow: rgba(74, 158, 74, 0.3);
    --flat: #b8553a;
    --sharp: #4a7fa9;
    --border: #e0e0e0;
}

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

body {
    font-family: 'Space Grotesk', -apple-system, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background-image: 
        radial-gradient(ellipse at 50% 0%, rgba(212, 168, 83, 0.03) 0%, transparent 50%),
        linear-gradient(180deg, var(--bg-primary) 0%, #08080a 100%);
    transition: background 0.3s ease, color 0.3s ease;
}

[data-theme="light"] body {
    background-image: 
        radial-gradient(ellipse at 50% 0%, rgba(184, 148, 74, 0.05) 0%, transparent 50%),
        linear-gradient(180deg, var(--bg-primary) 0%, #f5f5f5 100%);
}

.container {
    width: 100%;
    max-width: 400px;
    padding: 2rem;
}

header {
    text-align: center;
    margin-bottom: 3rem;
}

header h1 {
    font-size: 1.25rem;
    font-weight: 500;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--text-secondary);
}

main {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2rem;
}

/* Tuner Display */
.tuner {
    width: 100%;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 2rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.5rem;
}

/* Note Display */
.note-display {
    display: flex;
    align-items: baseline;
    gap: 0.25rem;
}

.note {
    font-family: 'JetBrains Mono', monospace;
    font-size: 5rem;
    font-weight: 600;
    line-height: 1;
    color: var(--text-primary);
    transition: color 0.2s ease;
}

.note.in-tune {
    color: var(--success);
    text-shadow: 0 0 30px var(--success-glow);
}

.octave {
    font-family: 'JetBrains Mono', monospace;
    font-size: 1.5rem;
    color: var(--text-muted);
}

/* Frequency Display */
.frequency {
    display: flex;
    align-items: baseline;
    gap: 0.35rem;
    color: var(--text-secondary);
}

.hz-value {
    font-family: 'JetBrains Mono', monospace;
    font-size: 1.1rem;
    font-weight: 500;
}

.hz-label {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--text-muted);
}

/* Tuning Meter */
.meter {
    width: 100%;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.meter-labels {
    display: flex;
    justify-content: space-between;
    padding: 0 0.5rem;
    font-size: 1.25rem;
}

.meter-labels span:first-child {
    color: var(--flat);
}

.meter-labels span:last-child {
    color: var(--sharp);
}

.meter-bar {
    position: relative;
    height: 32px;
    background: var(--bg-tertiary);
    border-radius: 4px;
    overflow: hidden;
    display: flex;
    align-items: flex-end;
    padding: 0 2px;
}

.meter-segments {
    display: flex;
    width: 100%;
    height: 100%;
    align-items: flex-end;
    justify-content: center;
    gap: 1px;
    position: relative;
}

.meter-segment {
    flex: 1;
    height: 6px;
    background: var(--bg-secondary);
    border-radius: 1px 1px 0 0;
    transition: height 0.1s ease-out, opacity 0.15s ease;
    position: relative;
    opacity: 0.4;
}

/* Center segment (in-tune) - green only when active */
.meter-segment.center {
    background: var(--bg-secondary);
    height: 6px;
    opacity: 0.4;
}

.meter-segment.center.active {
    background: var(--success);
    height: 32px;
    opacity: 1;
    box-shadow: 0 0 12px var(--success-glow);
}

/* Flat side (left) - red, getting darker */
.meter-segment.flat-1 {
    background: rgba(201, 101, 74, 1);
}

.meter-segment.flat-2 {
    background: rgba(201, 101, 74, 0.85);
}

.meter-segment.flat-3 {
    background: rgba(201, 101, 74, 0.7);
}

.meter-segment.flat-4 {
    background: rgba(201, 101, 74, 0.55);
}

.meter-segment.flat-5 {
    background: rgba(201, 101, 74, 0.4);
}

.meter-segment.flat-extreme {
    background: rgba(201, 101, 74, 0.25);
}

/* Sharp side (right) - red, getting darker */
.meter-segment.sharp-1 {
    background: rgba(201, 101, 74, 1);
}

.meter-segment.sharp-2 {
    background: rgba(201, 101, 74, 0.85);
}

.meter-segment.sharp-3 {
    background: rgba(201, 101, 74, 0.7);
}

.meter-segment.sharp-4 {
    background: rgba(201, 101, 74, 0.55);
}

.meter-segment.sharp-5 {
    background: rgba(201, 101, 74, 0.4);
}

.meter-segment.sharp-extreme {
    background: rgba(201, 101, 74, 0.25);
}

/* Active segments light up */
.meter-segment.active {
    height: 24px;
    opacity: 1;
}

.meter-segment.flat-extreme.active::before,
.meter-segment.sharp-extreme.active::before {
    content: '';
    position: absolute;
    top: -5px;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 0;
    border-left: 5px solid transparent;
    border-right: 5px solid transparent;
    border-bottom: 7px solid #f4d03f;
    filter: drop-shadow(0 0 6px rgba(244, 208, 63, 0.9));
    z-index: 1;
}

/* Subtle arc at bottom */
.meter-arc {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(
        to right,
        transparent 0%,
        rgba(201, 101, 74, 0.3) 20%,
        rgba(201, 101, 74, 0.4) 50%,
        rgba(201, 101, 74, 0.3) 80%,
        transparent 100%
    );
    border-radius: 0 0 4px 4px;
}

.cents {
    display: flex;
    align-items: baseline;
    justify-content: center;
    gap: 0.35rem;
}

.cents-value {
    font-family: 'JetBrains Mono', monospace;
    font-size: 1rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.cents-label {
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--text-muted);
}

/* String Indicators */
.strings {
    display: flex;
    gap: 0.5rem;
    width: 100%;
    justify-content: center;
}

.string {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.85rem;
    font-weight: 500;
    padding: 0.6rem 0.9rem;
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.2s ease;
}

.string:hover {
    border-color: var(--text-muted);
}

.string.active {
    background: var(--accent);
    border-color: var(--accent);
    color: var(--bg-primary);
    box-shadow: 0 0 16px var(--accent-glow);
}

.string.in-tune {
    background: var(--success);
    border-color: var(--success);
    color: var(--bg-primary);
    box-shadow: 0 0 16px var(--success-glow);
}

.string.locked {
    background: var(--bg-secondary);
    border: 1px solid var(--accent);
    color: var(--accent);
    box-shadow: 0 0 12px var(--accent-glow), 0 0 0 1px var(--accent);
    position: relative;
}

.string.locked::after {
    content: 'lock';
    font-family: 'Material Symbols Rounded';
    font-size: 0.75rem;
    position: absolute;
    top: -4px;
    right: -4px;
    background: var(--accent);
    color: var(--bg-primary);
    width: 16px;
    height: 16px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
    font-variation-settings: 'FILL' 1;
}

/* Start Button */
.start-btn {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 1rem 2rem;
    font-family: 'Space Grotesk', sans-serif;
    font-size: 1rem;
    font-weight: 500;
    background: var(--accent);
    border: none;
    border-radius: 12px;
    color: var(--bg-primary);
    cursor: pointer;
    transition: all 0.2s ease;
    box-shadow: 0 4px 20px var(--accent-glow);
}

.start-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 28px var(--accent-glow);
}

.start-btn:active {
    transform: translateY(0);
}

.start-btn.listening {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border);
    box-shadow: none;
}

.start-btn.listening:hover {
    background: var(--bg-secondary);
}

.start-btn .material-symbols-rounded {
    font-size: 1.25rem;
}

/* Status */
.status {
    font-size: 0.85rem;
    color: var(--text-muted);
    text-align: center;
    min-height: 1.5em;
}

.status.error {
    color: var(--flat);
}

/* Theme Toggle Button */
.theme-toggle {
    position: fixed;
    bottom: 1.5rem;
    left: 1.5rem;
    width: 36px;
    height: 36px;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 50%;
    color: var(--text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
    opacity: 0.6;
    z-index: 100;
}

.theme-toggle:hover {
    opacity: 1;
    background: var(--bg-tertiary);
    border-color: var(--text-muted);
    transform: scale(1.05);
}

.theme-toggle .material-symbols-rounded {
    font-size: 1.1rem;
}

/* Responsive */
@media (max-width: 440px) {
    .container {
        padding: 1.5rem;
    }
    
    .note {
        font-size: 4rem;
    }
    
    .string {
        padding: 0.5rem 0.7rem;
        font-size: 0.8rem;
    }
    
    .theme-toggle {
        bottom: 1rem;
        left: 1rem;
        width: 32px;
        height: 32px;
    }
}