/* ==================== CSS Variables (Light Theme) ==================== */
:root {
    --bg-body-start: #f0f4f8;
    --bg-body-end: #e2e8f0;
    --bg-primary: #ffffff;
    --bg-secondary: #e4e2e2;
    --bg-tertiary: #f7f7f7;
    --bg-card: #ffffff;
    --bg-input: #f7f7f7;
    --bg-floating-header: #389688;
    --bg-tooltip: #2d3748;
    --text-primary: #2d3748;
    --text-secondary: #718096;
    --text-muted: #a0aec0;
    --text-heading: #1a202c;
    --text-on-accent: #ffffff;
    --border-color: #cbd5e0;
    --border-light: #e2e8f0;
    --border-active: #4299e1;
    --accent: #389688;
    --accent-hover: #3182ce;
    --accent-light: rgba(66, 153, 225, 0.08);
    --bit-one-bg: #389688;
    --bit-one-bg-hover: #2d7a6e;
    --bit-one-text: #ffffff;
    --bit-zero-bg: #edf2f7;
    --bit-zero-bg-hover: #e2e8f0;
    --bit-zero-text: #718096;
    --highlight-bg: #fec157;
    --highlight-border: #fec157;
    --highlight-text: #1a1a1a;
    --highlight-zero-bg: #fbd38d;
    --highlight-zero-text: #744210;
    --highlight-zero-border: #f6ad55;
    --danger: #f56565;
    --success: #48bb78;
    --warning: #ed8936;
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
    --shadow-hover: 0 4px 12px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.12);
    --transition: 0.15s ease;
    --font-mono: 'SF Mono', 'Cascadia Code', 'Consolas', 'Monaco', 'Courier New', monospace;
    --font-sans: 'Inter', 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
}

/* ==================== Dark Theme ==================== */
[data-theme="dark"] {
    --bg-body-start: #0f172a;
    --bg-body-end: #1e293b;
    --bg-primary: #1e293b;
    --bg-secondary: #1a2332;
    --bg-tertiary: #162032;
    --bg-card: #1e293b;
    --bg-input: #1a2332;
    --bg-floating-header: #2d6a58;
    --bg-tooltip: #0f172a;
    --text-primary: #e2e8f0;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --text-heading: #f1f5f9;
    --text-on-accent: #ffffff;
    --border-color: #334155;
    --border-light: #273548;
    --border-active: #60a5fa;
    --accent: #4fd1a5;
    --accent-hover: #38b2ac;
    --accent-light: rgba(56, 178, 172, 0.1);
    --bit-one-bg: #389688;
    --bit-one-bg-hover: #2d7a6e;
    --bit-one-text: #ffffff;
    --bit-zero-bg: #1e293b;
    --bit-zero-bg-hover: #273548;
    --bit-zero-text: #94a3b8;
    --highlight-bg: #e6a817;
    --highlight-border: #e6a817;
    --highlight-text: #1a1a1a;
    --highlight-zero-bg: #b8860b;
    --highlight-zero-text: #fef3c7;
    --highlight-zero-border: #d4a017;
    --shadow: 0 2px 8px rgba(0, 0, 0, 0.25);
    --shadow-hover: 0 4px 12px rgba(0, 0, 0, 0.35);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.4);
}

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

body {
    background: linear-gradient(135deg, var(--bg-body-start) 0%, var(--bg-body-end) 100%);
    color: var(--text-primary);
    font-family: var(--font-sans);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: flex-start;
    padding: 8px;
    line-height: 1.5;
    font-size: 15px;
    margin-left: 0;
    transition: background 0.3s ease, color 0.3s ease;
}

/* ==================== Theme Switcher ==================== */
#theme-switcher {
    position: fixed;
    top: 20px;
    right: 20px;
    background: var(--bg-card);
    border-radius: 24px;
    padding: 8px;
    box-shadow: var(--shadow);
    display: flex;
    gap: 8px;
    z-index: 1000;
    transition: background 0.3s ease, box-shadow 0.3s ease;
    border: 1px solid var(--border-color);
}

.theme-btn {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    border: 2px solid transparent;
    cursor: pointer;
    transition: all 0.2s ease;
    padding: 0;
    margin: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    background: transparent;
}

.theme-btn:hover {
    transform: scale(1.1);
    box-shadow: var(--shadow-hover);
}

.theme-btn.active {
    border-color: var(--accent);
    box-shadow: 0 0 0 2px rgba(56, 150, 136, 0.2);
}

.theme-btn[data-theme="light"] {
    background: linear-gradient(135deg, #b8ddf5 0%, #ecc9dd 100%);
}

.theme-btn[data-theme="dark"] {
    background: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* ==================== Brand Watermark ==================== */
.brand-watermark {
    position: absolute;
    top: 8px;
    left: 12px;
    display: inline-block;
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 0.3px;
    text-decoration: none;
    color: var(--accent);
    background: var(--accent-light);
    border: 1px solid color-mix(in srgb, var(--accent) 30%, transparent);
    border-radius: 999px;
    padding: 3px 10px;
    transition: all 0.2s ease;
    z-index: 1;
}

.brand-watermark:hover {
    color: var(--accent-hover);
    background: color-mix(in srgb, var(--accent) 18%, var(--bg-card));
    border-color: var(--accent);
}

/* ==================== Layout ==================== */
.container {
    width: 100%;
    max-width: 1500px;
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    border: 1px solid var(--border-color);
    overflow: hidden;
}

/* ==================== Cards ==================== */
.cards {
    display: flex;
    flex-direction: column;
    gap: 8px;
    padding: 8px 10px;
}

.card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    box-shadow: 0 1px 4px rgba(0, 0, 0, 0.04);
    overflow: hidden;
}

[data-theme="dark"] .card {
    box-shadow: 0 1px 4px rgba(0, 0, 0, 0.2);
}

/* ==================== Header ==================== */
.header {
    background: var(--bg-tertiary);
    padding: 14px 20px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    text-align: center;
    position: relative;
}

.title {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.8rem;
    font-weight: 700;
    letter-spacing: -0.01em;
    color: var(--text-heading);
}

.icon-chip {
    color: var(--accent);
    flex-shrink: 0;
}

.subtitle {
    font-size: 0.88rem;
    color: var(--text-muted);
    font-weight: 400;
    letter-spacing: 0.02em;
}

/* ==================== Bit Width Selector ==================== */
.bitwidth-selector {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    padding: 10px 20px;
    flex-wrap: wrap;
    background: var(--bg-card);
}

.btn-group {
    display: flex;
    gap: 4px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
    padding: 3px;
    border: 1px solid var(--border-color);
}

.btn {
    cursor: pointer;
    border: none;
    outline: none;
    font-family: var(--font-sans);
    font-size: 0.95rem;
    font-weight: 500;
    transition: all var(--transition);
    user-select: none;
    white-space: nowrap;
}

.btn-bitwidth {
    padding: 8px 18px;
    border-radius: 5px;
    background: transparent;
    color: var(--text-secondary);
    font-weight: 600;
    letter-spacing: 0.01em;
}

.btn-bitwidth:hover {
    color: var(--text-primary);
    background: var(--accent-light);
}

.btn-bitwidth.active {
    background: var(--accent);
    color: #ffffff;
    box-shadow: 0 2px 8px rgba(66, 153, 225, 0.3);
}

/* ==================== Bit Grid ==================== */
.bitgrid-wrapper {
    padding: 12px 10px;
    min-height: 80px;
    display: flex;
    justify-content: center;
    align-items: flex-start;
    gap: 14px;
    flex-wrap: wrap;
    overflow-x: auto;
}

.bitgrid-panel {
    display: flex;
    flex-direction: column;
    gap: 4px;
    background: var(--bg-card);
    border-radius: var(--radius-md);
    padding: 10px 8px;
    border: 1px solid var(--border-color);
}

.bitgrid-panel-label {
    text-align: center;
    font-family: var(--font-mono);
    font-size: 0.78rem;
    color: var(--text-muted);
    margin-bottom: 3px;
    font-weight: 600;
    letter-spacing: 0.04em;
}

.bitgrid-row {
    display: flex;
    align-items: flex-end;
    gap: 2px;
}

.bitgrid-row .byte-hex {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-left: 8px;
    min-width: 40px;
    text-align: right;
    font-weight: 500;
}

.bitgrid-row .byte-label {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    color: var(--text-muted);
    margin-right: 6px;
    min-width: 46px;
    text-align: right;
    font-weight: 400;
}

/* Bit Cell - stacked index + value */
.bit-cell {
    width: 36px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2px;
    cursor: pointer;
    user-select: none;
    -webkit-user-select: none;
    touch-action: none;
    -webkit-tap-highlight-color: transparent;
    position: relative;
}

.bit-cell .bit-index {
    font-family: var(--font-mono);
    font-size: 0.56rem;
    color: var(--text-muted);
    font-weight: 600;
    letter-spacing: 0.02em;
    line-height: 1;
}

.bit-cell .bit-value {
    width: 100%;
    height: 30px;
    border-radius: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-mono);
    font-size: 0.85rem;
    font-weight: 700;
    transition: all var(--transition);
    border: 2px solid transparent;
    letter-spacing: 0;
}

.bit-cell .bit-value:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-hover);
    z-index: 2;
}

.bit-cell .bit-value.state-1 {
    background: var(--bit-one-bg);
    color: var(--bit-one-text);
    border-color: rgba(72, 187, 120, 0.3);
}

.bit-cell .bit-value.state-1:hover {
    background: var(--bit-one-bg-hover);
    border-color: rgba(56, 161, 105, 0.5);
}

.bit-cell .bit-value.state-0 {
    background: var(--bit-zero-bg);
    color: var(--bit-zero-text);
    border-color: #cbd5e0;
}

[data-theme="dark"] .bit-cell .bit-value.state-0 {
    border-color: #334155;
}

.bit-cell .bit-value.state-0:hover {
    background: var(--bit-zero-bg-hover);
    color: #4a5568;
    border-color: #a0aec0;
}

[data-theme="dark"] .bit-cell .bit-value.state-0:hover {
    color: #cbd5e1;
    border-color: #64748b;
}

.bit-cell .bit-value.highlighted {
    background: var(--highlight-bg) !important;
    color: var(--highlight-text) !important;
    border-color: var(--highlight-border) !important;
    box-shadow: 0 0 8px rgba(245, 158, 11, 0.3);
    animation: pulse-highlight 1.8s ease-in-out infinite;
}

.bit-cell .bit-value.highlighted.state-0 {
    background: var(--highlight-zero-bg) !important;
    color: var(--highlight-zero-text) !important;
    border-color: var(--highlight-zero-border) !important;
}

.bit-cell .bit-value.drag-selected {
    box-shadow: 0 0 0 2px rgba(237, 137, 54, 0.6), 0 2px 8px rgba(237, 137, 54, 0.25);
    border-color: rgba(237, 137, 54, 0.8) !important;
    filter: brightness(1.1);
}

@keyframes pulse-highlight {
    0%, 100% { box-shadow: 0 0 6px rgba(245, 158, 11, 0.25); }
    50% { box-shadow: 0 0 16px rgba(245, 158, 11, 0.5); }
}

/* Byte separator gap */
.bit-cell.nibble-gap {
    margin-right: 4px;
}

.bit-cell.byte-gap {
    margin-left: 4px;
}

/* Tooltip */
.bit-cell .tooltip {
    position: absolute;
    bottom: 110%;
    left: 50%;
    transform: translateX(-50%);
    background: var(--bg-tooltip);
    color: #ffffff;
    padding: 4px 10px;
    border-radius: 4px;
    font-size: 0.7rem;
    font-family: var(--font-mono);
    white-space: nowrap;
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.2s ease;
    border: 1px solid #4a5568;
    z-index: 10;
}

.bit-cell:hover .tooltip {
    opacity: 1;
}

/* ==================== Value Display ==================== */
.value-display {
    padding: 14px 16px;
    background: var(--bg-card);
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.value-row {
    display: flex;
    align-items: stretch;
    gap: 10px;
}

.value-row-multi {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 10px;
}

.value-row-bin {
    display: flex;
}

.value-col {
    display: flex;
    flex-direction: column;
    gap: 4px;
    min-width: 0;
}

.value-col-bin {
    flex: 1;
}

.value-col-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 6px;
}

.value-label {
    font-weight: 700;
    font-size: 0.85rem;
    color: var(--accent);
    font-family: var(--font-mono);
    letter-spacing: 0.04em;
}

.hex-input-group {
    display: flex;
    align-items: center;
    gap: 0;
    flex: 1;
    min-width: 0;
}

.hex-prefix {
    font-family: var(--font-mono);
    font-size: 0.95rem;
    color: var(--text-muted);
    font-weight: 600;
    background: var(--bg-tertiary);
    padding: 7px 10px;
    border-radius: var(--radius-sm) 0 0 var(--radius-sm);
    border: 1px solid var(--border-color);
    border-right: none;
    flex-shrink: 0;
}

.hex-input {
    flex: 1;
    font-family: var(--font-mono);
    font-size: 0.95rem;
    padding: 7px 10px;
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    outline: none;
    letter-spacing: 0.06em;
    transition: border-color var(--transition);
    min-width: 0;
}

.hex-input:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 2px rgba(66, 153, 225, 0.1);
}

.hex-input.error {
    border-color: var(--danger);
    box-shadow: 0 0 0 2px rgba(245, 101, 101, 0.1);
}

.btn-sm {
    padding: 6px 10px;
    font-size: 0.8rem;
}

.value-mono {
    font-family: var(--font-mono);
    font-size: 0.95rem;
    color: var(--text-primary);
    background: var(--bg-tertiary);
    padding: 7px 10px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-color);
    word-break: break-all;
    letter-spacing: 0.03em;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* Base input fields (DEC/OCT/BIN) */
.base-input {
    width: 100%;
    font-family: var(--font-mono);
    font-size: 0.95rem;
    padding: 7px 10px;
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    outline: none;
    letter-spacing: 0.03em;
    transition: border-color var(--transition), box-shadow var(--transition);
}

.base-input:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 2px rgba(66, 153, 225, 0.1);
}

.base-input.error {
    border-color: var(--danger);
    box-shadow: 0 0 0 2px rgba(245, 101, 101, 0.1);
}

.bin-input {
    font-size: 0.82rem;
    letter-spacing: 0.06em;
    line-height: 1.6;
}

/* ==================== Actions ==================== */
.actions {
    padding: 14px 16px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
    background: var(--bg-card);
}

.action-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
    background: var(--bg-tertiary);
    padding: 10px 14px;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
}

.action-group-label {
    font-size: 0.78rem;
    color: var(--text-muted);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    white-space: nowrap;
}

.action-group .btn-row {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr 1fr;
    gap: 6px;
}

.btn-action {
    padding: 8px 6px;
    border-radius: var(--radius-sm);
    background: var(--bg-secondary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    font-size: 0.88rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition);
    text-align: center;
}

.btn-action:hover {
    background: #ebf8ff;
    border-color: var(--accent);
    color: var(--accent);
}

[data-theme="dark"] .btn-action:hover {
    background: rgba(56, 178, 172, 0.12);
}

.btn-action:active {
    transform: scale(0.96);
}

/* ==================== Status Bar ==================== */
.status-bar {
    padding: 8px 16px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.82rem;
    color: var(--text-muted);
    background: var(--bg-tertiary);
    border-top: 1px solid var(--border-color);
    flex-wrap: wrap;
    gap: 8px;
}

.status-bar strong {
    color: var(--text-primary);
    font-family: var(--font-mono);
    font-weight: 600;
}

.status-right {
    font-family: var(--font-mono);
    font-size: 0.8rem;
}

/* ==================== Floating Panel ==================== */
.floating-panel {
    position: fixed;
    display: none;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    z-index: 1000;
    min-width: 240px;
    overflow: hidden;
    animation: float-in 0.15s ease;
}

.floating-panel.visible {
    display: block;
}

@keyframes float-in {
    from { opacity: 0; transform: translateY(4px); }
    to { opacity: 1; transform: translateY(0); }
}

.floating-panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 8px 12px;
    background: var(--bg-floating-header);
    color: #ffffff;
}

.floating-panel-title {
    font-family: var(--font-mono);
    font-size: 0.88rem;
    font-weight: 700;
}

.btn-floating-close {
    background: transparent;
    color: #ffffff;
    border: none;
    padding: 2px 6px;
    font-size: 0.95rem;
    cursor: pointer;
    border-radius: 4px;
    transition: background var(--transition);
}

.btn-floating-close:hover {
    background: rgba(255, 255, 255, 0.2);
}

.floating-panel-body {
    padding: 12px 14px;
    display: flex;
    flex-direction: column;
    gap: 5px;
}

.floating-row {
    display: flex;
    align-items: center;
    gap: 8px;
}

.floating-row-action {
    padding-top: 4px;
    border-top: 1px solid var(--border-color);
    margin-top: 2px;
    justify-content: center;
}

.btn-reverse {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    font-weight: 600;
    background: var(--accent);
    color: #ffffff;
    border: 1px solid color-mix(in srgb, var(--accent) 70%, #000);
    border-radius: var(--radius-sm);
    padding: 5px 12px;
    cursor: pointer;
    transition: background var(--transition), border-color var(--transition);
}

.btn-reverse:hover {
    background: var(--accent-hover);
    border-color: var(--accent);
}

.floating-label {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--text-muted);
    font-weight: 600;
    min-width: 30px;
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.floating-value {
    font-family: var(--font-mono);
    font-size: 0.88rem;
    color: var(--text-primary);
    font-weight: 600;
    word-break: break-all;
}

.floating-input {
    flex: 1;
    font-family: var(--font-mono);
    font-size: 0.8rem;
    padding: 4px 8px;
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    outline: none;
    letter-spacing: 0.03em;
    transition: border-color var(--transition);
    min-width: 0;
}

.floating-input:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 2px rgba(66, 153, 225, 0.1);
}

/* ==================== Responsive ==================== */
@media (max-width: 900px) {
    .title {
        font-size: 1.4rem;
    }

    .bitgrid-wrapper {
        flex-direction: column;
        align-items: center;
        gap: 10px;
        padding: 8px;
    }

    .bit-cell {
        width: 30px;
    }

    .bit-cell .bit-value {
        height: 26px;
        font-size: 0.75rem;
    }

    .bit-cell .bit-index {
        font-size: 0.5rem;
    }

    .bit-cell.nibble-gap {
        margin-right: 3px;
    }

    .bit-cell.byte-gap {
        margin-left: 3px;
    }

    .actions {
        grid-template-columns: 1fr;
        gap: 8px;
        padding: 10px;
    }

    .action-group .btn-row {
        grid-template-columns: 1fr 1fr;
    }

    .header {
        padding: 12px 14px;
    }

    .value-row-multi {
        grid-template-columns: 1fr;
    }

    .floating-panel {
        min-width: 200px;
    }

    .brand-watermark {
        top: 6px;
        left: 8px;
        font-size: 11px;
        padding: 2px 8px;
    }
}

/* Mobile: 8-bit rows kick in via JS at 650px */
@media (max-width: 650px) {
    body {
        padding: 4px;
    }

    .container {
        border-radius: 8px;
    }

    .header {
        padding: 10px 14px 10px 14px;
    }

    .title {
        font-size: 1.25rem;
        gap: 6px;
        margin-top: 2px;
    }

    .icon-chip {
        width: 22px;
        height: 22px;
    }

    .subtitle {
        font-size: 0.75rem;
    }

    .cards {
        padding: 4px 6px;
        gap: 4px;
    }

    .bitwidth-selector {
        padding: 8px 10px;
        gap: 6px;
    }

    .btn-bitwidth {
        padding: 6px 12px;
        font-size: 0.82rem;
    }

    .bitgrid-wrapper {
        padding: 6px 4px;
        gap: 8px;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
    }

    .bitgrid-panel {
        padding: 6px 4px;
        border-radius: 6px;
    }

    .bitgrid-panel-label {
        font-size: 0.68rem;
    }

    .bit-cell {
        width: 28px;
    }

    .bit-cell .bit-value {
        height: 24px;
        font-size: 0.72rem;
    }

    .bit-cell .bit-index {
        font-size: 0.45rem;
    }

    .bit-cell.nibble-gap {
        margin-right: 2px;
    }

    .bitgrid-row {
        gap: 1px;
    }

    .bitgrid-row .byte-hex,
    .bitgrid-row .byte-label {
        font-size: 0.62rem;
        margin-left: 2px;
        margin-right: 2px;
        min-width: 16px;
    }

    .value-display {
        padding: 10px 12px;
        gap: 6px;
    }

    .value-row-multi {
        gap: 6px;
    }

    .value-label {
        font-size: 0.72rem;
    }

    .base-input, .hex-input, .hex-input-group {
        font-size: 0.82rem;
    }

    .hex-prefix {
        font-size: 0.82rem;
        padding: 6px 8px;
    }

    .bin-input {
        font-size: 0.7rem;
    }

    .actions {
        padding: 10px;
        gap: 8px;
    }

    .action-group {
        padding: 8px 10px;
    }

    .action-group-label {
        font-size: 0.68rem;
    }

    .btn-action {
        font-size: 0.78rem;
        padding: 7px 5px;
    }

    .status-bar {
        padding: 6px 10px;
        font-size: 0.7rem;
        flex-direction: column;
        gap: 2px;
        text-align: center;
    }

    .status-right {
        font-size: 0.68rem;
    }

    .floating-panel {
        min-width: 180px;
        max-width: calc(100vw - 32px);
    }

    .floating-panel-body {
        padding: 8px 10px;
    }

    .floating-input {
        font-size: 0.7rem;
    }

    #theme-switcher {
        top: 6px;
        right: 6px;
        padding: 4px 6px;
        gap: 4px;
        border-radius: 16px;
    }

    .theme-btn {
        width: 30px;
        height: 30px;
        font-size: 13px;
    }

    .brand-watermark {
        top: 4px;
        left: 6px;
        font-size: 10px;
        padding: 2px 7px;
    }
}

@media (max-width: 400px) {
    .bit-cell {
        width: 24px;
    }

    .bit-cell .bit-value {
        height: 22px;
        font-size: 0.65rem;
    }

    .bit-cell .bit-index {
        font-size: 0.4rem;
    }

    .bitgrid-row .byte-hex,
    .bitgrid-row .byte-label {
        font-size: 0.55rem;
        min-width: 14px;
    }

    .title {
        font-size: 1.1rem;
    }

    .btn-bitwidth {
        padding: 5px 10px;
        font-size: 0.75rem;
    }

    .btn-action {
        font-size: 0.72rem;
        padding: 6px 4px;
    }
}