/* ============================================
   OptionA Tuner — Dark Theme Stylesheet
   ============================================ */

/* CSS Variables */
:root {
    --bg-primary: #1a1a2e;
    --bg-secondary: #16213e;
    --bg-card: #1e2a45;
    --bg-hover: #2a3a5c;
    --text-primary: #e0e0e0;
    --text-secondary: #8892a8;
    --text-muted: #5a6478;
    --color-intune: #4ecdc4;
    --color-warning: #f7b731;
    --color-flat: #e74c3c;
    --color-sharp: #e74c3c;
    --color-accent: #667eea;
    --color-accent-hover: #764ba2;
    --gauge-track: #2a3a5c;
    --needle-color: #ffffff;
    --border-color: #2a3a5c;
    --shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
    --radius: 12px;
    --radius-sm: 8px;
    --transition: 0.2s ease;
}

/* Reset & Base */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html, body {
    height: 100%;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

h1:focus {
    outline: none;
}

#app {
    min-height: 100vh;
}

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

.tuner-container {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    max-width: 480px;
    margin: 0 auto;
    padding: 1rem;
}

/* ============================================
   Header
   ============================================ */

.tuner-header {
    text-align: center;
    padding-bottom: 1rem;
}

.header-brand {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.header-logo {
    width: 32px;
    height: auto;
}

.tuner-header h1 {
    font-size: 1.4rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0;
    letter-spacing: 0.02em;
}

.controls-row {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

.control-group {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.35rem;
}

.control-group label {
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--text-secondary);
    font-weight: 500;
}

.control-group select {
    background: var(--bg-card);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: 0.4rem 0.8rem;
    font-size: 0.85rem;
    cursor: pointer;
    outline: none;
    transition: border-color var(--transition);
    appearance: auto;
}

.control-group select:focus {
    border-color: var(--color-accent);
}

/* ============================================
   Instrument Picker (Searchable Dropdown)
   ============================================ */

.instrument-picker {
    position: relative;
    min-width: 160px;
}

.instrument-picker-toggle {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.5rem;
    width: 100%;
    background: var(--bg-card);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: 0.4rem 0.6rem;
    font-size: 0.85rem;
    cursor: pointer;
    outline: none;
    transition: border-color var(--transition);
    text-align: left;
    white-space: nowrap;
}

.instrument-picker-toggle:hover,
.instrument-picker.open .instrument-picker-toggle {
    border-color: var(--color-accent);
}

.picker-chevron {
    font-size: 0.7rem;
    color: var(--text-secondary);
    transition: transform var(--transition);
}

.instrument-picker.open .picker-chevron {
    transform: rotate(180deg);
}

.instrument-picker-dropdown {
    position: absolute;
    top: calc(100% + 4px);
    left: 50%;
    transform: translateX(-50%);
    min-width: 220px;
    max-height: 320px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    box-shadow: var(--shadow);
    z-index: 100;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.picker-search-wrap {
    position: relative;
    padding: 0.4rem;
    border-bottom: 1px solid var(--border-color);
    flex-shrink: 0;
}

.picker-search {
    width: 100%;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 0.35rem 1.8rem 0.35rem 0.5rem;
    font-size: 0.8rem;
    color: var(--text-primary);
    outline: none;
    transition: border-color var(--transition);
}

.picker-search::placeholder {
    color: var(--text-muted);
}

.picker-search:focus {
    border-color: var(--color-accent);
}

.picker-search-clear {
    position: absolute;
    right: 0.6rem;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 0.7rem;
    cursor: pointer;
    padding: 0.2rem;
    line-height: 1;
}

.picker-search-clear:hover {
    color: var(--text-primary);
}

.picker-options {
    overflow-y: auto;
    flex: 1;
    scrollbar-width: thin;
    scrollbar-color: var(--border-color) transparent;
}

.picker-group {
    padding-bottom: 0.2rem;
}

.picker-group-header {
    font-size: 0.65rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--text-muted);
    padding: 0.5rem 0.6rem 0.2rem;
    position: sticky;
    top: 0;
    background: var(--bg-secondary);
}

.picker-option {
    display: block;
    width: 100%;
    text-align: left;
    background: none;
    border: none;
    color: var(--text-primary);
    padding: 0.35rem 0.6rem 0.35rem 1rem;
    font-size: 0.8rem;
    cursor: pointer;
    transition: background var(--transition);
}

.picker-option:hover {
    background: var(--bg-hover);
}

.picker-option.selected {
    color: var(--color-accent);
    font-weight: 600;
}

.picker-no-results {
    padding: 1rem;
    text-align: center;
    color: var(--text-muted);
    font-size: 0.8rem;
}

/* Pitch Selector */
.pitch-selector {
    display: flex;
    align-items: center;
    gap: 0.3rem;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: 0.15rem;
}

.pitch-btn {
    width: 32px;
    height: 32px;
    border: none;
    background: transparent;
    color: var(--text-primary);
    font-size: 1.1rem;
    cursor: pointer;
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background var(--transition);
}

.pitch-btn:hover:not(:disabled) {
    background: var(--bg-hover);
}

.pitch-btn:disabled {
    opacity: 0.3;
    cursor: not-allowed;
}

.pitch-value {
    font-size: 0.85rem;
    font-weight: 600;
    min-width: 55px;
    text-align: center;
    color: var(--text-primary);
}

/* ============================================
   Main Tuner Area
   ============================================ */

.tuner-main {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
}

/* ============================================
   Note Display
   ============================================ */

.note-display {
    text-align: center;
    padding: 1rem 0;
    min-height: 100px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.note-name-row {
    display: flex;
    align-items: baseline;
    gap: 0.1rem;
    justify-content: center;
}

.note-name {
    font-size: 4.5rem;
    font-weight: 700;
    line-height: 1;
    color: var(--text-primary);
}

.note-name.muted {
    color: var(--text-muted);
}

.note-octave {
    font-size: 1.8rem;
    font-weight: 400;
    color: var(--text-secondary);
    align-self: flex-end;
    margin-bottom: 0.3rem;
}

.accidental-indicator {
    width: 2.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
}

.accidental-indicator.left {
    justify-content: flex-end;
}

.accidental-indicator.right {
    justify-content: flex-start;
}

.indicator {
    font-size: 2rem;
    font-weight: 700;
}

.indicator.flat {
    color: var(--color-flat);
}

.indicator.sharp {
    color: var(--color-sharp);
}

.indicator.intune {
    color: var(--color-intune);
    font-size: 1.8rem;
}

.frequency-display {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-top: 0.25rem;
    font-variant-numeric: tabular-nums;
}

.frequency-display.muted {
    color: var(--text-muted);
    font-style: italic;
}

/* ============================================
   Tuning Gauge (SVG)
   ============================================ */

.tuning-gauge {
    width: 100%;
    max-width: 340px;
}

.gauge-svg {
    width: 100%;
    height: auto;
}

.gauge-label {
    fill: var(--text-secondary);
    font-size: 11px;
    text-anchor: middle;
    font-family: inherit;
}

.gauge-label.center-label {
    font-weight: 700;
    fill: var(--color-intune);
    font-size: 13px;
}

.needle-group {
    transition: transform 0.15s ease-out;
}

.tuning-gauge.inactive .needle-group {
    opacity: 0.3;
}

.cents-display {
    text-align: center;
    margin-top: -0.5rem;
}

.cents-value {
    font-size: 0.8rem;
    font-weight: 500;
    font-variant-numeric: tabular-nums;
}

.cents-value.intune {
    color: var(--color-intune);
}

.cents-value.warning {
    color: var(--color-warning);
}

.cents-value.flat,
.cents-value.sharp {
    color: var(--color-flat);
}

.cents-value.muted {
    color: var(--text-muted);
}

/* ============================================
   String Indicator
   ============================================ */

.string-indicator {
    display: flex;
    gap: 0.75rem;
    justify-content: center;
    padding: 0.75rem 0;
}

.string-button {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    width: 56px;
    height: 56px;
    border: 2px solid var(--border-color);
    border-radius: var(--radius);
    background: var(--bg-card);
    color: var(--text-secondary);
    cursor: default;
    transition: all var(--transition);
    position: relative;
}

.string-button.closest {
    border-color: var(--color-intune);
    background: rgba(78, 205, 196, 0.1);
    color: var(--color-intune);
    box-shadow: 0 0 12px rgba(78, 205, 196, 0.3);
}

.string-note {
    font-size: 1.3rem;
    font-weight: 700;
    line-height: 1;
}

.string-octave {
    font-size: 0.65rem;
    opacity: 0.7;
    line-height: 1;
}

/* ============================================
   Start / Stop Button
   ============================================ */

.start-stop {
    padding: 1rem 0;
    display: flex;
    justify-content: center;
}

.btn-start, .btn-stop {
    border: none;
    border-radius: var(--radius);
    padding: 0.8rem 2rem;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.btn-start {
    background: linear-gradient(135deg, var(--color-accent), var(--color-accent-hover));
    color: white;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
}

.btn-start:hover {
    transform: translateY(-1px);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.5);
}

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

.btn-icon {
    font-size: 1.2rem;
}

.btn-stop {
    background: var(--bg-card);
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
}

.btn-stop:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}

/* ============================================
   Error Message
   ============================================ */

.error-message {
    text-align: center;
    padding: 2rem;
    color: var(--color-warning);
}

.error-message p {
    margin-bottom: 0.5rem;
}

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

.tuner-footer {
    text-align: center;
    padding: 1rem 0;
    font-size: 0.75rem;
    color: var(--text-muted);
    letter-spacing: 0.05em;
}

/* ============================================
   Loading indicator
   ============================================ */

.loading-progress {
    position: relative;
    display: block;
    width: 8rem;
    height: 8rem;
    margin: 20vh auto 1rem;
}

.loading-progress circle {
    fill: none;
    stroke: var(--color-accent);
    stroke-width: 0.6rem;
    transform-origin: 50% 50%;
}

.loading-progress circle:last-child {
    stroke: var(--bg-hover);
    stroke-dasharray: calc(3.141 * var(--blazor-load-percentage, 0%) * 0.8), 500%;
    transition: stroke-dasharray 0.05s ease-in-out;
}

.loading-progress-text {
    text-align: center;
    font-weight: 600;
    color: var(--text-secondary);
}

.loading-progress-text::after {
    content: var(--blazor-load-percentage-text, "Loading tuner...");
}

/* ============================================
   Blazor Error UI
   ============================================ */

#blazor-error-ui {
    background: var(--color-flat);
    color: white;
    padding: 0.5rem;
    text-align: center;
    position: fixed;
    bottom: 0;
    width: 100%;
    z-index: 1000;
    display: none;
}

#blazor-error-ui .dismiss {
    cursor: pointer;
    position: absolute;
    right: 0.75rem;
    top: 0.5rem;
}

.blazor-error-boundary {
    background: #b32121;
    padding: 1rem;
    color: white;
}

.blazor-error-boundary::after {
    content: "An error has occurred.";
}

/* ============================================
   Responsive
   ============================================ */

@media (min-width: 768px) {
    .tuner-container {
        padding: 2rem;
    }

    .tuner-header h1 {
        font-size: 1.6rem;
    }

    .note-name {
        font-size: 5.5rem;
    }

    .tuning-gauge {
        max-width: 400px;
    }
}

@media (max-width: 360px) {
    .note-name {
        font-size: 3.5rem;
    }

    .string-button {
        width: 48px;
        height: 48px;
    }

    .string-note {
        font-size: 1.1rem;
    }

    .controls-row {
        gap: 0.5rem;
    }
}