/* ============================
   NeuroScope - EEG Analysis Platform
   Color Scheme: White & Light Blue
   ============================ */

:root {
    --primary: #4A90D9;
    --primary-light: #6BA5E7;
    --primary-dark: #2E6DB4;
    --primary-bg: #EBF3FC;
    --primary-bg-subtle: #F5F9FF;
    --white: #FFFFFF;
    --bg: #F8FAFD;
    --text: #1E293B;
    --text-secondary: #64748B;
    --text-muted: #94A3B8;
    --border: #E2E8F0;
    --border-light: #F1F5F9;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.06), 0 2px 4px rgba(0,0,0,0.04);
    --shadow-lg: 0 10px 30px rgba(0,0,0,0.08), 0 4px 8px rgba(0,0,0,0.04);
    --shadow-xl: 0 20px 50px rgba(0,0,0,0.1);
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 20px;
    --transition: 0.2s ease;
    --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

    --delta-color: #8B5CF6;
    --theta-color: #06B6D4;
    --alpha-color: #10B981;
    --beta-color: #F59E0B;
    --gamma-color: #EF4444;
}

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

html {
    font-size: 14px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font);
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    overflow-x: hidden;
    min-height: 100vh;
}

::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}
::-webkit-scrollbar-track {
    background: transparent;
}
::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 3px;
}
::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}

/* ============================
   Loading Screen
   ============================ */
.loading-screen {
    position: fixed;
    inset: 0;
    background: var(--white);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10000;
    transition: opacity 0.5s ease, visibility 0.5s ease;
}
.loading-screen.hidden {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
}
.loader-content {
    text-align: center;
}
.brain-pulse svg {
    animation: pulse 2s ease-in-out infinite;
}
.wave-path {
    stroke-dasharray: 200;
    stroke-dashoffset: 200;
    animation: drawWave 1.5s ease-in-out infinite;
}
@keyframes pulse {
    0%, 100% { transform: scale(1); opacity: 1; }
    50% { transform: scale(1.05); opacity: 0.8; }
}
@keyframes drawWave {
    0% { stroke-dashoffset: 200; }
    50% { stroke-dashoffset: 0; }
    100% { stroke-dashoffset: -200; }
}
.loader-title {
    font-size: 1.6rem;
    font-weight: 700;
    color: var(--primary);
    margin-top: 16px;
    letter-spacing: -0.02em;
}
.loader-subtitle {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-top: 4px;
}
.loader-bar {
    width: 180px;
    height: 3px;
    background: var(--border);
    border-radius: 3px;
    margin: 20px auto 0;
    overflow: hidden;
}
.loader-bar-inner {
    height: 100%;
    width: 40%;
    background: var(--primary);
    border-radius: 3px;
    animation: loadSlide 1.2s ease-in-out infinite;
}
@keyframes loadSlide {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(350%); }
}

/* ============================
   Header
   ============================ */
.main-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 56px;
    background: rgba(255,255,255,0.92);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 20px;
    z-index: 1000;
    transition: box-shadow var(--transition);
}
.main-header.scrolled {
    box-shadow: var(--shadow-sm);
}
.header-left, .header-right {
    display: flex;
    align-items: center;
    gap: 12px;
    min-width: 200px;
}
.header-right {
    justify-content: flex-end;
}
.logo {
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    transition: opacity var(--transition);
}
.logo:hover { opacity: 0.8; }
.logo-text {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--primary);
    letter-spacing: -0.03em;
}

.header-nav {
    display: none;
    gap: 2px;
    align-items: center;
}
.header-nav.visible {
    display: flex;
}
.nav-btn {
    display: flex;
    align-items: center;
    gap: 5px;
    padding: 6px 12px;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    font-family: var(--font);
    font-size: 0.82rem;
    font-weight: 500;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition);
    white-space: nowrap;
}
.nav-btn:hover {
    background: var(--primary-bg);
    color: var(--primary);
}
.nav-btn.active {
    background: var(--primary-bg);
    color: var(--primary);
    font-weight: 600;
}
.nav-btn svg {
    flex-shrink: 0;
}

.btn-header {
    display: none;
    align-items: center;
    gap: 6px;
    padding: 6px 14px;
    border: 1px solid var(--border);
    background: var(--white);
    color: var(--text-secondary);
    font-family: var(--font);
    font-size: 0.82rem;
    font-weight: 500;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition);
}
.btn-header.visible {
    display: flex;
}
.btn-header:hover {
    border-color: var(--primary);
    color: var(--primary);
    background: var(--primary-bg-subtle);
}
.file-badge {
    display: none;
    align-items: center;
    gap: 6px;
    padding: 4px 12px;
    background: var(--primary-bg);
    color: var(--primary);
    border-radius: 20px;
    font-size: 0.78rem;
    font-weight: 500;
    max-width: 200px;
}
.file-badge.visible {
    display: flex;
}
.file-badge span {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

/* ============================
   Upload Section
   ============================ */
.upload-section {
    padding-top: 56px;
    min-height: 100vh;
}
.upload-section.hidden {
    display: none;
}
.upload-hero {
    position: relative;
    padding: 60px 20px 40px;
    text-align: center;
    overflow: hidden;
}
.hero-bg-pattern {
    position: absolute;
    inset: 0;
    background:
        radial-gradient(circle at 20% 50%, rgba(74,144,217,0.06) 0%, transparent 50%),
        radial-gradient(circle at 80% 50%, rgba(74,144,217,0.04) 0%, transparent 50%),
        radial-gradient(circle at 50% 0%, rgba(74,144,217,0.08) 0%, transparent 40%);
    pointer-events: none;
}
.hero-content {
    position: relative;
    z-index: 1;
}
.hero-icon {
    margin-bottom: 20px;
    animation: float 4s ease-in-out infinite;
}
@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-8px); }
}
.hero-title {
    font-size: 2.6rem;
    font-weight: 800;
    color: var(--text);
    letter-spacing: -0.04em;
    margin-bottom: 8px;
}
.hero-desc {
    font-size: 1.1rem;
    color: var(--text-secondary);
    max-width: 500px;
    margin: 0 auto;
    font-weight: 400;
}

.upload-container {
    max-width: 600px;
    margin: 0 auto;
    padding: 0 20px 40px;
}
.upload-area {
    border: 2px dashed var(--border);
    border-radius: var(--radius-xl);
    padding: 50px 40px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    background: var(--white);
    position: relative;
}
.upload-area:hover, .upload-area.drag-over {
    border-color: var(--primary);
    background: var(--primary-bg-subtle);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}
.upload-area.drag-over {
    border-style: solid;
}
.upload-icon-area {
    margin-bottom: 16px;
    opacity: 0.7;
}
.upload-title {
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 4px;
}
.upload-subtitle {
    font-size: 0.9rem;
    color: var(--text-muted);
}
.format-badges {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    justify-content: center;
    margin-top: 20px;
}
.badge {
    padding: 3px 10px;
    background: var(--primary-bg);
    color: var(--primary);
    font-size: 0.72rem;
    font-weight: 600;
    border-radius: 12px;
    letter-spacing: 0.03em;
}

.upload-progress {
    display: none;
    margin-top: 24px;
    position: relative;
}
.upload-progress.active {
    display: block;
}
.upload-progress-bar {
    height: 4px;
    background: var(--border);
    border-radius: 4px;
    overflow: hidden;
    position: relative;
}
.upload-progress-bar::after {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    height: 100%;
    width: 0%;
    background: var(--primary);
    border-radius: 4px;
    transition: width 0.3s ease;
}
.upload-progress-bar.indeterminate::after {
    width: 30%;
    animation: indeterminate 1.5s ease-in-out infinite;
}
@keyframes indeterminate {
    0% { left: -30%; }
    100% { left: 100%; }
}
#upload-progress-text {
    display: block;
    text-align: center;
    font-size: 0.82rem;
    color: var(--text-secondary);
    margin-top: 8px;
}

.upload-divider {
    display: flex;
    align-items: center;
    gap: 16px;
    margin: 24px 0;
    color: var(--text-muted);
    font-size: 0.85rem;
}
.upload-divider::before, .upload-divider::after {
    content: '';
    flex: 1;
    height: 1px;
    background: var(--border);
}

.btn-sample {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 14px 24px;
    border: 1px solid var(--border);
    background: var(--white);
    color: var(--text);
    font-family: var(--font);
    font-size: 0.95rem;
    font-weight: 500;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition);
}
.btn-sample:hover {
    border-color: var(--primary);
    color: var(--primary);
    background: var(--primary-bg-subtle);
    box-shadow: var(--shadow-sm);
}

.features-section {
    max-width: 1000px;
    margin: 0 auto;
    padding: 40px 20px 60px;
}
.features-heading {
    text-align: center;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 32px;
    letter-spacing: -0.02em;
}
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 16px;
}
.feature-card {
    background: var(--white);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    padding: 28px 24px;
    transition: all 0.3s ease;
}
.feature-card:hover {
    border-color: var(--primary-bg);
    box-shadow: var(--shadow-md);
    transform: translateY(-3px);
}
.feature-icon {
    width: 48px;
    height: 48px;
    background: var(--primary-bg);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 14px;
}
.feature-card h3 {
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 6px;
}
.feature-card p {
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

/* ============================
   Dashboard
   ============================ */
.dashboard {
    display: none;
    padding-top: 56px;
    height: 100vh;
}
.dashboard.visible {
    display: flex;
}

/* Sidebar */
.sidebar {
    width: 260px;
    min-width: 260px;
    height: calc(100vh - 56px);
    background: var(--white);
    border-right: 1px solid var(--border);
    overflow-y: auto;
    padding: 16px;
    display: flex;
    flex-direction: column;
    gap: 16px;
}
.sidebar-section {
    background: var(--bg);
    border-radius: var(--radius-md);
    padding: 14px;
}
.sidebar-section h3 {
    font-size: 0.78rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.06em;
    margin-bottom: 10px;
}
.sidebar-section-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 10px;
}
.sidebar-section-header h3 {
    margin-bottom: 0;
}
.channel-actions {
    display: flex;
    gap: 4px;
}
.btn-tiny {
    padding: 2px 8px;
    border: 1px solid var(--border);
    background: var(--white);
    color: var(--text-secondary);
    font-family: var(--font);
    font-size: 0.7rem;
    font-weight: 500;
    border-radius: 4px;
    cursor: pointer;
    transition: all var(--transition);
}
.btn-tiny:hover {
    border-color: var(--primary);
    color: var(--primary);
}

.channel-list {
    max-height: 280px;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 2px;
}
.channel-item {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 5px 8px;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: background var(--transition);
    font-size: 0.82rem;
}
.channel-item:hover {
    background: var(--white);
}
.channel-item input[type="checkbox"] {
    accent-color: var(--primary);
    cursor: pointer;
}
.channel-item .ch-color {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    flex-shrink: 0;
}
.channel-item .ch-name {
    font-weight: 500;
    color: var(--text);
}

.control-group {
    margin-bottom: 12px;
}
.control-group:last-child {
    margin-bottom: 0;
}
.control-group label {
    display: block;
    font-size: 0.78rem;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 4px;
}
.control-group.inline {
    display: inline-flex;
    flex-direction: column;
    margin-right: 12px;
    margin-bottom: 8px;
}
.range-row {
    display: flex;
    align-items: center;
    gap: 8px;
}
.range-value {
    font-size: 0.78rem;
    font-weight: 600;
    color: var(--primary);
    min-width: 38px;
    text-align: right;
}
input[type="range"] {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 4px;
    background: var(--border);
    border-radius: 4px;
    outline: none;
    cursor: pointer;
}
input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 14px;
    height: 14px;
    background: var(--primary);
    border-radius: 50%;
    border: 2px solid var(--white);
    box-shadow: var(--shadow-sm);
    cursor: pointer;
    transition: transform var(--transition);
}
input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.2);
}

.info-list {
    display: flex;
    flex-direction: column;
    gap: 6px;
}
.info-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.8rem;
}
.info-label {
    color: var(--text-secondary);
}
.info-value {
    font-weight: 600;
    color: var(--text);
}

/* Main Content */
.main-content {
    flex: 1;
    height: calc(100vh - 56px);
    overflow-y: auto;
    padding: 20px;
    background: var(--bg);
}
.tab-content {
    display: none;
    animation: fadeIn 0.3s ease;
}
.tab-content.active {
    display: block;
}
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(6px); }
    to { opacity: 1; transform: translateY(0); }
}
.tab-header {
    margin-bottom: 20px;
}
.tab-header h2 {
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--text);
    letter-spacing: -0.02em;
    margin-bottom: 4px;
}
.tab-header p {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

/* Buttons */
.btn-primary {
    padding: 8px 20px;
    background: var(--primary);
    color: var(--white);
    border: none;
    font-family: var(--font);
    font-size: 0.85rem;
    font-weight: 600;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition);
}
.btn-primary:hover {
    background: var(--primary-dark);
    box-shadow: var(--shadow-sm);
}
.btn-secondary {
    padding: 8px 20px;
    background: var(--white);
    color: var(--primary);
    border: 1px solid var(--primary);
    font-family: var(--font);
    font-size: 0.85rem;
    font-weight: 600;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition);
}
.btn-secondary:hover {
    background: var(--primary-bg-subtle);
}
.btn-ghost {
    padding: 8px 20px;
    background: transparent;
    color: var(--text-secondary);
    border: 1px solid var(--border);
    font-family: var(--font);
    font-size: 0.85rem;
    font-weight: 500;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition);
}
.btn-ghost:hover {
    border-color: var(--text-muted);
    color: var(--text);
}

/* Toolbar */
.viewer-toolbar, .spectrum-controls, .band-controls,
.filter-controls, .timefreq-controls, .topo-controls, .stats-controls {
    display: flex;
    align-items: flex-end;
    flex-wrap: wrap;
    gap: 8px;
    padding: 12px 16px;
    background: var(--white);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-md);
    margin-bottom: 16px;
}
.btn-tool {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--border);
    background: var(--white);
    color: var(--text-secondary);
    font-family: var(--font);
    font-size: 0.78rem;
    font-weight: 600;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition);
}
.btn-tool:hover {
    border-color: var(--primary);
    color: var(--primary);
    background: var(--primary-bg-subtle);
}
.toolbar-separator {
    width: 1px;
    height: 24px;
    background: var(--border);
    margin: 0 4px;
}
.toolbar-label {
    font-size: 0.78rem;
    font-weight: 500;
    color: var(--text-secondary);
    margin-right: 4px;
    align-self: center;
}
.toolbar-select {
    padding: 6px 10px;
    border: 1px solid var(--border);
    background: var(--white);
    color: var(--text);
    font-family: var(--font);
    font-size: 0.82rem;
    border-radius: var(--radius-sm);
    cursor: pointer;
    outline: none;
    transition: border-color var(--transition);
}
.toolbar-select:focus {
    border-color: var(--primary);
}
.toolbar-input {
    padding: 6px 10px;
    border: 1px solid var(--border);
    background: var(--white);
    color: var(--text);
    font-family: var(--font);
    font-size: 0.82rem;
    border-radius: var(--radius-sm);
    width: 80px;
    outline: none;
    transition: border-color var(--transition);
}
.toolbar-input:focus {
    border-color: var(--primary);
}

/* Canvas Container */
.canvas-container {
    background: var(--white);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-md);
    padding: 16px;
    position: relative;
    overflow: hidden;
}
.canvas-container canvas {
    width: 100%;
    display: block;
}
#viewer-canvas-container {
    position: relative;
    min-height: 500px;
}
#viewer-canvas {
    width: 100%;
    height: 500px;
}
.canvas-labels {
    position: absolute;
    left: 0;
    top: 16px;
    bottom: 16px;
    width: 70px;
    pointer-events: none;
}
.canvas-label {
    position: absolute;
    left: 8px;
    font-size: 0.72rem;
    font-weight: 600;
    color: var(--text-secondary);
    transform: translateY(-50%);
    white-space: nowrap;
}

/* Chart containers */
.chart-container {
    background: var(--white);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-md);
    padding: 20px;
    margin-bottom: 16px;
}
.chart-container canvas {
    width: 100% !important;
    max-height: 400px;
}
.chart-half {
    display: inline-block;
    width: calc(50% - 8px);
    vertical-align: top;
}
.chart-half:nth-child(even) {
    margin-left: 16px;
}

/* Band Power */
.bands-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 12px;
    margin-bottom: 20px;
}
.band-card {
    background: var(--white);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-md);
    padding: 16px;
    text-align: center;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}
.band-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
}
.band-card.delta::before { background: var(--delta-color); }
.band-card.theta::before { background: var(--theta-color); }
.band-card.alpha::before { background: var(--alpha-color); }
.band-card.beta::before { background: var(--beta-color); }
.band-card.gamma::before { background: var(--gamma-color); }

.band-card.delta { color: var(--delta-color); }
.band-card.theta { color: var(--theta-color); }
.band-card.alpha { color: var(--alpha-color); }
.band-card.beta { color: var(--beta-color); }
.band-card.gamma { color: var(--gamma-color); }

.band-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
}
.band-wave {
    margin-bottom: 8px;
    opacity: 0.5;
}
.band-card h4 {
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: 2px;
}
.band-range {
    display: block;
    font-size: 0.72rem;
    opacity: 0.7;
    margin-bottom: 8px;
}
.band-value {
    display: block;
    font-size: 1.2rem;
    font-weight: 800;
}

/* Filtering */
.filter-status {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 16px;
    background: var(--primary-bg-subtle);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-md);
    margin-bottom: 12px;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-secondary);
}
.filter-status-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: #94A3B8;
    flex-shrink: 0;
}
.filter-status.active-filter {
    background: #ECFDF5;
    border-color: #A7F3D0;
    color: #065F46;
}
.filter-status.active-filter .filter-status-dot {
    background: #10B981;
}
.filter-type-cards {
    display: flex;
    gap: 4px;
    margin-right: 16px;
}
.filter-type-btn {
    padding: 6px 16px;
    border: 1px solid var(--border);
    background: var(--white);
    color: var(--text-secondary);
    font-family: var(--font);
    font-size: 0.82rem;
    font-weight: 500;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition);
}
.filter-type-btn.active {
    background: var(--primary);
    color: var(--white);
    border-color: var(--primary);
}
.filter-type-btn:hover {
    border-color: var(--primary);
}
.filter-params {
    display: flex;
    align-items: flex-end;
    flex-wrap: wrap;
    gap: 4px;
}
.filter-actions {
    display: flex;
    gap: 8px;
    margin-left: auto;
}
.filter-canvas-row {
    display: flex;
    gap: 16px;
    margin-top: 0;
}
.filter-compare-container {
    flex: 3;
    min-height: 360px;
    position: relative;
}
.filter-response-container {
    flex: 2;
    min-height: 360px;
}
.filter-canvas-title {
    font-size: 0.78rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 8px;
}
#filter-canvas {
    width: 100%;
    height: 320px;
}
#filter-response-canvas {
    width: 100%;
    height: 320px;
}
.processing-overlay .processing-text {
    margin-left: 12px;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-secondary);
}
@media (max-width: 1100px) {
    .filter-canvas-row {
        flex-direction: column;
    }
}

/* Spectrogram */
.spectrogram-container {
    position: relative;
    min-height: 350px;
}
#spectrogram-canvas {
    width: calc(100% - 60px);
    height: 300px;
}
.colorbar-canvas {
    position: absolute;
    right: 16px;
    top: 16px;
    width: 30px;
    height: 300px;
}

/* Statistics */
.stats-table-wrap {
    overflow-x: auto;
    background: var(--white);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-md);
    margin-bottom: 20px;
}
.stats-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.82rem;
}
.stats-table th {
    background: var(--primary-bg);
    color: var(--primary-dark);
    font-weight: 600;
    padding: 10px 14px;
    text-align: left;
    white-space: nowrap;
    border-bottom: 2px solid var(--border);
    position: sticky;
    top: 0;
}
.stats-table td {
    padding: 8px 14px;
    border-bottom: 1px solid var(--border-light);
    color: var(--text);
}
.stats-table tr:hover td {
    background: var(--primary-bg-subtle);
}
.stats-table td:first-child {
    font-weight: 600;
    color: var(--primary);
}
.stats-charts {
    display: flex;
    gap: 16px;
}
.stats-charts .chart-container {
    flex: 1;
}

/* Topography */
.topo-display {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 20px;
    background: var(--white);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-md);
    padding: 30px;
}
#topo-canvas {
    border-radius: var(--radius-md);
}
#topo-colorbar {
    position: static;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-light);
}

/* Export */
.export-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 16px;
}
.export-card {
    background: var(--white);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    padding: 28px 24px;
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
}
.export-card:hover {
    border-color: var(--primary-bg);
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}
.export-icon {
    width: 56px;
    height: 56px;
    background: var(--primary-bg);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 16px;
}
.export-card h3 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 6px;
}
.export-card p {
    font-size: 0.82rem;
    color: var(--text-secondary);
    margin-bottom: 16px;
    line-height: 1.5;
    flex: 1;
}
.btn-export {
    padding: 8px 20px;
    background: var(--primary-bg);
    color: var(--primary);
    border: none;
    font-family: var(--font);
    font-size: 0.85rem;
    font-weight: 600;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition);
    width: 100%;
    margin-top: auto;
}
.btn-export:hover {
    background: var(--primary);
    color: var(--white);
}

/* Export extras */
.export-time-range {
    display: flex;
    align-items: center;
    gap: 6px;
    margin-bottom: 12px;
    flex-wrap: wrap;
}
.export-range-sep {
    font-size: 0.8rem;
    color: var(--text-muted);
}
.export-range-unit {
    font-size: 0.8rem;
    color: var(--text-secondary);
}

/* Toolbar time display */
.toolbar-time-display {
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--primary);
    background: var(--primary-bg);
    padding: 4px 12px;
    border-radius: 12px;
    white-space: nowrap;
    align-self: center;
}

/* Toast */
.toast-container {
    position: fixed;
    bottom: 24px;
    right: 24px;
    z-index: 9999;
    display: flex;
    flex-direction: column;
    gap: 8px;
}
.toast {
    padding: 12px 20px;
    background: var(--text);
    color: var(--white);
    font-family: var(--font);
    font-size: 0.85rem;
    font-weight: 500;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    animation: toastIn 0.3s ease;
    min-width: 260px;
    display: flex;
    align-items: center;
    gap: 10px;
}
.toast.success { background: #059669; }
.toast.error { background: #DC2626; }
.toast.info { background: var(--primary); }
.toast.removing {
    animation: toastOut 0.3s ease forwards;
}
@keyframes toastIn {
    from { transform: translateX(100%); opacity: 0; }
    to { transform: translateX(0); opacity: 1; }
}
@keyframes toastOut {
    from { transform: translateX(0); opacity: 1; }
    to { transform: translateX(100%); opacity: 0; }
}

/* Responsive */
@media (max-width: 1100px) {
    .nav-btn span { display: none; }
    .nav-btn { padding: 6px 8px; }
    .bands-grid { grid-template-columns: repeat(3, 1fr); }
    .chart-half {
        display: block;
        width: 100%;
    }
    .chart-half:nth-child(even) {
        margin-left: 0;
    }
}

/* Processing overlay */
.processing-overlay {
    position: absolute;
    inset: 0;
    background: rgba(255,255,255,0.85);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 100;
    border-radius: var(--radius-md);
}
.processing-spinner {
    width: 32px;
    height: 32px;
    border: 3px solid var(--border);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 0.7s linear infinite;
}
@keyframes spin {
    to { transform: rotate(360deg); }
}

/* ============================
   Mobile Hamburger (hidden on desktop)
   ============================ */
.mobile-sidebar-toggle {
    display: none;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border: 1px solid var(--border);
    background: var(--white);
    border-radius: var(--radius-sm);
    cursor: pointer;
    color: var(--text-secondary);
    transition: all var(--transition);
    flex-shrink: 0;
}
.mobile-sidebar-toggle:hover {
    border-color: var(--primary);
    color: var(--primary);
}

/* Mobile sidebar overlay (hidden on desktop) */
.mobile-sidebar-overlay {
    display: none;
}

/* Mobile bottom nav (hidden on desktop) */
.mobile-bottom-nav {
    display: none;
}

/* Mobile more menu (hidden on desktop) */
.mobile-more-menu {
    display: none;
}

/* ============================
   Mobile Responsive (<= 768px)
   ============================ */
@media (max-width: 768px) {
    /* --- Header --- */
    .main-header {
        height: 50px;
        padding: 0 12px;
    }
    .header-left, .header-right {
        min-width: auto;
        gap: 8px;
    }
    .mobile-sidebar-toggle {
        display: flex;
    }
    .logo-text {
        font-size: 1rem;
    }
    /* Hide desktop nav on mobile */
    .header-nav {
        display: none !important;
    }
    .btn-header span {
        display: none;
    }
    .btn-header {
        padding: 6px 8px;
    }
    .file-badge {
        max-width: 120px;
        font-size: 0.7rem;
        padding: 3px 8px;
    }

    /* --- Mobile Sidebar Overlay --- */
    .mobile-sidebar-overlay {
        display: block;
        position: fixed;
        inset: 0;
        background: rgba(0, 0, 0, 0.4);
        z-index: 1999;
        opacity: 0;
        visibility: hidden;
        transition: opacity 0.3s ease, visibility 0.3s ease;
    }
    .mobile-sidebar-overlay.active {
        opacity: 1;
        visibility: visible;
    }

    /* --- Sidebar as mobile drawer --- */
    .sidebar {
        position: fixed;
        top: 0;
        left: 0;
        width: 280px;
        min-width: 280px;
        height: 100vh;
        height: 100dvh;
        z-index: 2000;
        transform: translateX(-100%);
        transition: transform 0.3s ease;
        padding-top: 16px;
        box-shadow: none;
    }
    .sidebar.mobile-open {
        transform: translateX(0);
        box-shadow: var(--shadow-xl);
    }

    /* --- Dashboard reformatted --- */
    .dashboard {
        padding-top: 50px;
        height: auto;
        min-height: 100vh;
        min-height: 100dvh;
    }
    .dashboard.visible {
        display: block;
    }

    /* --- Main content full width --- */
    .main-content {
        width: 100%;
        height: auto;
        min-height: calc(100vh - 50px - 60px);
        min-height: calc(100dvh - 50px - 60px);
        padding: 14px 10px 80px;
        overflow-y: auto;
    }

    /* --- Upload section --- */
    .upload-section {
        padding-top: 50px;
    }
    .upload-hero {
        padding: 32px 16px 24px;
    }
    .hero-title {
        font-size: 1.6rem;
    }
    .hero-desc {
        font-size: 0.95rem;
    }
    .hero-icon svg {
        width: 48px;
        height: 48px;
    }
    .upload-container {
        padding: 0 14px 30px;
    }
    .upload-area {
        padding: 30px 20px;
        border-radius: var(--radius-lg);
    }
    .upload-title {
        font-size: 1.1rem;
    }
    .features-section {
        padding: 24px 14px 40px;
    }
    .features-heading {
        font-size: 1.15rem;
    }
    .features-grid {
        grid-template-columns: 1fr;
        gap: 10px;
    }
    .feature-card {
        padding: 20px 18px;
    }

    /* --- Tab content --- */
    .tab-header h2 {
        font-size: 1.15rem;
    }
    .tab-header p {
        font-size: 0.82rem;
    }

    /* --- Signal Viewer --- */
    #viewer-canvas-container {
        min-height: 350px;
    }
    #viewer-canvas {
        height: 350px;
    }
    .viewer-toolbar {
        flex-wrap: wrap;
        gap: 6px;
        padding: 8px 10px;
    }
    .toolbar-separator {
        display: none;
    }
    .toolbar-label {
        font-size: 0.72rem;
    }
    .toolbar-select {
        font-size: 0.78rem;
        padding: 5px 6px;
    }
    .toolbar-time-display {
        font-size: 0.72rem;
        padding: 3px 8px;
    }

    /* --- Spectrum / Band / Filter / TimeFreq controls --- */
    .spectrum-controls, .band-controls,
    .filter-controls, .timefreq-controls,
    .topo-controls, .stats-controls {
        flex-direction: column;
        align-items: stretch;
        gap: 8px;
        padding: 10px 12px;
    }
    .control-group.inline {
        display: flex;
        width: 100%;
        margin-right: 0;
    }
    .control-group.inline .toolbar-select,
    .control-group.inline .toolbar-input {
        width: 100%;
    }
    .btn-primary, .btn-secondary, .btn-ghost {
        width: 100%;
        text-align: center;
    }

    /* --- Band Power --- */
    .bands-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 8px;
    }
    .band-card {
        padding: 12px 10px;
    }
    .band-card h4 {
        font-size: 0.88rem;
    }
    .band-value {
        font-size: 1rem;
    }

    /* --- Charts --- */
    .chart-half {
        display: block;
        width: 100%;
    }
    .chart-half:nth-child(even) {
        margin-left: 0;
    }
    .chart-container {
        padding: 12px;
    }
    .chart-container canvas {
        max-height: 280px;
    }

    /* --- Filter --- */
    .filter-type-cards {
        flex-wrap: wrap;
        gap: 6px;
        margin-right: 0;
    }
    .filter-type-btn {
        flex: 1;
        min-width: 0;
        text-align: center;
        padding: 8px 10px;
        font-size: 0.78rem;
    }
    .filter-params {
        flex-direction: column;
        gap: 8px;
    }
    .filter-actions {
        flex-direction: column;
        margin-left: 0;
        gap: 6px;
    }
    .filter-canvas-row {
        flex-direction: column;
        gap: 12px;
    }
    .filter-compare-container,
    .filter-response-container {
        min-height: 250px;
    }
    #filter-canvas,
    #filter-response-canvas {
        height: 220px;
    }

    /* --- Spectrogram --- */
    .spectrogram-container {
        min-height: 250px;
    }
    #spectrogram-canvas {
        width: calc(100% - 45px);
        height: 220px;
    }
    .colorbar-canvas {
        width: 24px;
        height: 220px;
        right: 10px;
    }

    /* --- Statistics --- */
    .stats-table-wrap {
        -webkit-overflow-scrolling: touch;
    }
    .stats-table th, .stats-table td {
        padding: 6px 8px;
        font-size: 0.75rem;
    }
    .stats-charts {
        flex-direction: column;
    }

    /* --- Topography --- */
    .topo-display {
        flex-direction: column;
        padding: 16px;
        gap: 12px;
    }
    #topo-canvas {
        width: 100%;
        max-width: 320px;
        height: auto;
    }
    #topo-colorbar {
        width: 280px;
        height: 24px;
    }

    /* --- Export --- */
    .export-grid {
        grid-template-columns: 1fr;
        gap: 12px;
    }
    .export-card {
        padding: 20px 16px;
    }

    /* --- Toast --- */
    .toast-container {
        bottom: 72px;
        right: 12px;
        left: 12px;
    }
    .toast {
        min-width: auto;
        font-size: 0.8rem;
        padding: 10px 14px;
    }

    /* --- Mobile Bottom Navigation --- */
    .mobile-bottom-nav {
        display: none;
        position: fixed;
        bottom: 0;
        left: 0;
        right: 0;
        height: 60px;
        background: rgba(255, 255, 255, 0.96);
        backdrop-filter: blur(12px);
        -webkit-backdrop-filter: blur(12px);
        border-top: 1px solid var(--border);
        z-index: 1500;
        align-items: center;
        justify-content: space-around;
        padding: 0 4px;
        padding-bottom: env(safe-area-inset-bottom, 0px);
    }
    .mobile-bottom-nav.visible {
        display: flex;
    }
    .mobile-nav-btn {
        display: flex;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        gap: 2px;
        padding: 6px 4px;
        background: none;
        border: none;
        color: var(--text-muted);
        font-family: var(--font);
        font-size: 0.62rem;
        font-weight: 500;
        cursor: pointer;
        transition: color var(--transition);
        min-width: 0;
        flex: 1;
    }
    .mobile-nav-btn.active {
        color: var(--primary);
    }
    .mobile-nav-btn svg {
        flex-shrink: 0;
    }

    /* --- Mobile more menu --- */
    .mobile-more-menu {
        position: fixed;
        bottom: 68px;
        right: 8px;
        background: var(--white);
        border: 1px solid var(--border);
        border-radius: var(--radius-md);
        box-shadow: var(--shadow-lg);
        z-index: 1600;
        padding: 6px;
        min-width: 160px;
        flex-direction: column;
        gap: 2px;
        /* hidden by default, shown via JS */
        display: none;
    }
    .mobile-more-menu.visible {
        display: flex;
    }
    .mobile-more-item {
        display: block;
        width: 100%;
        padding: 10px 14px;
        background: none;
        border: none;
        color: var(--text);
        font-family: var(--font);
        font-size: 0.88rem;
        font-weight: 500;
        text-align: left;
        border-radius: var(--radius-sm);
        cursor: pointer;
        transition: background var(--transition);
    }
    .mobile-more-item:hover,
    .mobile-more-item.active {
        background: var(--primary-bg);
        color: var(--primary);
    }

    /* Add safe-area padding for notched phones */
    .main-content {
        padding-bottom: calc(80px + env(safe-area-inset-bottom, 0px));
    }
}

/* ============================
   Very small screens (<= 380px)
   ============================ */
@media (max-width: 380px) {
    .hero-title {
        font-size: 1.3rem;
    }
    .hero-desc {
        font-size: 0.85rem;
    }
    .upload-area {
        padding: 24px 14px;
    }
    .upload-title {
        font-size: 1rem;
    }
    .bands-grid {
        grid-template-columns: 1fr;
    }
    .mobile-nav-btn span {
        font-size: 0.58rem;
    }
    .sidebar {
        width: 260px;
        min-width: 260px;
    }
    .tab-header h2 {
        font-size: 1rem;
    }
}