/* ========================================
   Audio Recorder - White & Clean Theme
   ======================================== */

:root {
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --primary-light: #3b82f6;
    --primary-bg: #eff6ff;
    --danger: #ef4444;
    --danger-dark: #dc2626;
    --danger-bg: #fef2f2;
    --warning: #f59e0b;
    --warning-bg: #fffbeb;
    --success: #10b981;
    --success-bg: #ecfdf5;
    --bg: #f8fafc;
    --bg-white: #ffffff;
    --bg-subtle: #f1f5f9;
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-muted: #94a3b8;
    --border: #e2e8f0;
    --border-hover: #cbd5e1;
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.04);
    --shadow: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.07), 0 2px 4px -2px rgba(0,0,0,0.05);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.08), 0 4px 6px -4px rgba(0,0,0,0.04);
    --radius: 16px;
    --radius-sm: 10px;
    --radius-xs: 6px;
    --transition: all 0.2s ease;
}

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

body {
    font-family: 'Inter', 'Noto Sans JP', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg);
    color: var(--text-primary);
    min-height: 100vh;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

/* ===== App Container ===== */
.app-container {
    max-width: 720px;
    margin: 0 auto;
    padding: 24px 20px;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* ===== Header ===== */
.app-header {
    text-align: center;
    padding: 32px 0 28px;
}

.logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    margin-bottom: 6px;
}

.logo i {
    font-size: 1.6rem;
    color: var(--primary);
}

.logo h1 {
    font-size: 1.6rem;
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: -0.02em;
}

.subtitle {
    color: var(--text-muted);
    font-size: 0.875rem;
    font-weight: 400;
}

/* ===== Main Content ===== */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

/* ===== Section Card ===== */
.section-title {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.06em;
    margin-bottom: 14px;
    display: flex;
    align-items: center;
    gap: 6px;
}

.section-title i {
    color: var(--text-muted);
    font-size: 0.8rem;
}

.source-section,
.controls-section,
.recordings-section {
    background: var(--bg-white);
    border-radius: var(--radius);
    padding: 24px;
    border: 1px solid var(--border);
    box-shadow: var(--shadow);
}

/* ===== Source Selection ===== */
.source-options {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
}

.source-card {
    cursor: pointer;
    display: block;
}

.source-card input[type="radio"] {
    display: none;
}

.card-inner {
    background: var(--bg);
    border: 1.5px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 16px 12px;
    text-align: center;
    transition: var(--transition);
    position: relative;
}

.card-inner:hover {
    border-color: var(--border-hover);
    background: var(--bg-subtle);
}

.source-card input:checked + .card-inner {
    border-color: var(--primary);
    background: var(--primary-bg);
}

.card-icon {
    font-size: 1.5rem;
    color: var(--text-muted);
    margin-bottom: 6px;
    transition: var(--transition);
}

.source-card input:checked + .card-inner .card-icon {
    color: var(--primary);
}

.card-text {
    display: flex;
    flex-direction: column;
    gap: 1px;
}

.card-title {
    font-weight: 600;
    font-size: 0.85rem;
    color: var(--text-primary);
}

.source-card input:checked + .card-inner .card-title {
    color: var(--primary-dark);
}

.card-desc {
    font-size: 0.7rem;
    color: var(--text-muted);
}

.card-check {
    position: absolute;
    top: 8px;
    right: 8px;
    color: var(--primary);
    font-size: 0.85rem;
    opacity: 0;
    transition: var(--transition);
}

.source-card input:checked + .card-inner .card-check {
    opacity: 1;
}

/* ===== Controls Section ===== */
.controls-section {
    text-align: center;
    padding: 28px 24px;
}

/* Timer */
.timer {
    font-size: 2.8rem;
    font-weight: 700;
    font-family: 'Inter', monospace;
    color: var(--text-primary);
    letter-spacing: 2px;
    margin-bottom: 20px;
    font-variant-numeric: tabular-nums;
}

.timer.recording {
    color: var(--danger);
    animation: pulse-text 1.5s ease-in-out infinite;
}

.timer.paused {
    color: var(--warning);
    animation: blink 1s step-end infinite;
}

@keyframes pulse-text {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.6; }
}

@keyframes blink {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.2; }
}

/* Visualizer */
.visualizer-container {
    width: 100%;
    height: 88px;
    background: var(--bg);
    border-radius: var(--radius-sm);
    margin-bottom: 14px;
    overflow: hidden;
    border: 1px solid var(--border);
}

#visualizer {
    width: 100%;
    height: 100%;
    display: block;
}

/* Level Meter */
.level-meter-container {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 24px;
    padding: 0 4px;
}

.level-label {
    font-size: 0.7rem;
    color: var(--text-muted);
    white-space: nowrap;
    min-width: 52px;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.level-meter {
    flex: 1;
    height: 4px;
    background: var(--bg-subtle);
    border-radius: 2px;
    overflow: hidden;
}

.level-bar {
    width: 0%;
    height: 100%;
    background: linear-gradient(90deg, var(--success), var(--warning), var(--danger));
    border-radius: 2px;
    transition: width 0.1s ease;
}

/* ===== Control Buttons ===== */
.controls {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 12px;
    margin-bottom: 20px;
}

.btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 5px;
    padding: 14px 22px;
    border: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-family: inherit;
    font-size: 0.78rem;
    font-weight: 500;
    transition: var(--transition);
    min-width: 84px;
}

.btn:disabled {
    opacity: 0.25;
    cursor: not-allowed;
    transform: none !important;
}

.btn i {
    font-size: 1.3rem;
}

.btn-record {
    background: var(--danger);
    color: white;
}

.btn-record:not(:disabled):hover {
    background: var(--danger-dark);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(239, 68, 68, 0.3);
}

.btn-record.recording {
    animation: pulse-record 1.5s ease-in-out infinite;
}

@keyframes pulse-record {
    0%, 100% { box-shadow: 0 0 0 0 rgba(239, 68, 68, 0.3); }
    50% { box-shadow: 0 0 0 10px rgba(239, 68, 68, 0); }
}

.btn-pause {
    background: var(--bg-subtle);
    color: var(--text-primary);
    border: 1.5px solid var(--border);
}

.btn-pause:not(:disabled):hover {
    background: var(--bg);
    border-color: var(--border-hover);
    transform: translateY(-1px);
}

.btn-stop {
    background: var(--bg-subtle);
    color: var(--text-primary);
    border: 1.5px solid var(--border);
}

.btn-stop:not(:disabled):hover {
    background: var(--bg);
    border-color: var(--border-hover);
    transform: translateY(-1px);
}

/* Mute Button */
.btn-mute {
    background: var(--bg-subtle);
    color: var(--text-primary);
    border: 1.5px solid var(--border);
}

.btn-mute:not(:disabled):hover {
    background: var(--bg);
    border-color: var(--border-hover);
    transform: translateY(-1px);
}

.btn-mute.muted {
    background: var(--danger-bg);
    color: var(--danger);
    border-color: var(--danger);
}

.btn-mute.muted:not(:disabled):hover {
    background: #fee2e2;
}

/* ===== Status ===== */
.status {
    font-size: 0.82rem;
    color: var(--text-secondary);
    padding: 8px 16px;
    background: var(--bg);
    border-radius: 20px;
    display: inline-block;
    border: 1px solid var(--border);
}

.status.recording {
    color: var(--danger);
    background: var(--danger-bg);
    border-color: #fecaca;
}

.status.paused {
    color: #b45309;
    background: var(--warning-bg);
    border-color: #fde68a;
}

.status.success {
    color: #047857;
    background: var(--success-bg);
    border-color: #a7f3d0;
}

.status.error {
    color: var(--danger);
    background: var(--danger-bg);
    border-color: #fecaca;
}

/* ===== Recordings Section ===== */
.recordings-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.recording-item {
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 14px 16px;
    display: flex;
    align-items: center;
    gap: 14px;
    transition: var(--transition);
}

.recording-item:hover {
    border-color: var(--border-hover);
    box-shadow: var(--shadow-sm);
}

.recording-icon {
    width: 40px;
    height: 40px;
    background: var(--primary-bg);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
    color: var(--primary);
    flex-shrink: 0;
}

.recording-info {
    flex: 1;
    min-width: 0;
}

.recording-name {
    font-weight: 600;
    font-size: 0.88rem;
    color: var(--text-primary);
    margin-bottom: 2px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.recording-meta {
    font-size: 0.75rem;
    color: var(--text-muted);
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.recording-meta i {
    margin-right: 2px;
}

.recording-actions {
    display: flex;
    gap: 6px;
    flex-shrink: 0;
}

.btn-action {
    width: 34px;
    height: 34px;
    border: 1.5px solid var(--border);
    border-radius: 8px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.82rem;
    transition: var(--transition);
    background: var(--bg-white);
    color: var(--text-secondary);
}

.btn-action:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-sm);
}

.btn-play {
    color: var(--primary);
    border-color: #bfdbfe;
}

.btn-play:hover {
    background: var(--primary-bg);
    border-color: var(--primary);
}

.btn-download {
    color: var(--success);
    border-color: #a7f3d0;
}

.btn-download:hover {
    background: var(--success-bg);
    border-color: var(--success);
}

.btn-delete {
    color: var(--text-muted);
    border-color: var(--border);
}

.btn-delete:hover {
    background: var(--danger-bg);
    border-color: var(--danger);
    color: var(--danger);
}

/* ===== Loading Overlay ===== */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(255, 255, 255, 0.85);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    backdrop-filter: blur(12px);
}

.loading-content {
    text-align: center;
    padding: 40px;
    background: var(--bg-white);
    border-radius: var(--radius);
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border);
}

.spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--border);
    border-top: 3px solid var(--primary);
    border-radius: 50%;
    animation: spin 0.7s linear infinite;
    margin: 0 auto 16px;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.loading-content p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 14px;
    font-weight: 500;
}

.progress-bar-container {
    width: 220px;
    height: 4px;
    background: var(--bg-subtle);
    border-radius: 2px;
    overflow: hidden;
    margin: 0 auto;
}

.progress-bar {
    height: 100%;
    width: 0%;
    background: var(--primary);
    border-radius: 2px;
    transition: width 0.3s ease;
}

/* ===== Footer ===== */
.app-footer {
    text-align: center;
    padding: 20px 0;
    color: var(--text-muted);
    font-size: 0.75rem;
    margin-top: 28px;
}

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

@media (max-width: 640px) {
    .app-container {
        padding: 12px;
    }

    .app-header {
        padding: 20px 0 16px;
    }

    .logo h1 {
        font-size: 1.3rem;
    }

    .logo i {
        font-size: 1.3rem;
    }

    .subtitle {
        font-size: 0.8rem;
    }

    .source-options {
        grid-template-columns: 1fr;
        gap: 8px;
    }

    .card-inner {
        display: flex;
        align-items: center;
        gap: 12px;
        text-align: left;
        padding: 12px 16px;
    }

    .card-icon {
        font-size: 1.2rem;
        margin-bottom: 0;
    }

    .card-text {
        flex: 1;
    }

    .timer {
        font-size: 2rem;
    }

    .visualizer-container {
        height: 64px;
    }

    .controls {
        gap: 8px;
        flex-wrap: wrap;
    }

    .btn {
        padding: 10px 14px;
        min-width: 70px;
        font-size: 0.72rem;
    }

    .btn i {
        font-size: 1.1rem;
    }

    .recording-item {
        flex-wrap: wrap;
        gap: 10px;
    }

    .recording-actions {
        width: 100%;
        justify-content: flex-end;
    }

    .source-section,
    .controls-section,
    .recordings-section {
        padding: 18px;
    }
}

@media (max-width: 380px) {
    .timer {
        font-size: 1.7rem;
        letter-spacing: 1px;
    }

    .btn {
        padding: 8px 10px;
        min-width: 60px;
    }
}