/* CSS Variables for Brand Theme */
:root {
    --radius: 12px;
    --radius-sm: 8px;
}

/* Dark Theme (default) */
[data-theme="dark"] {
    --bg-primary: #000000;
    --bg-secondary: #111111;
    --bg-card: #111111;
    --text-primary: #ffffff;
    --text-secondary: #9ca3af;
    --border-color: #1f1f1f;
    --accent: #d1d5db;
    --accent-muted: #9ca3af;
    --accent-bg: #3a3a3a;
    --accent-bg-hover: #444444;
    --accent-text: #f0f0f0;
    --accent-subtle: rgba(255, 255, 255, 0.08);
    --accent-glow: rgba(255, 255, 255, 0.15);
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.4), 0 2px 4px -2px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.4), 0 4px 6px -4px rgba(0, 0, 0, 0.3);
}

/* Light Theme */
[data-theme="light"] {
    --bg-primary: #f9fafb;
    --bg-secondary: #f3f4f6;
    --bg-card: #ffffff;
    --text-primary: #000000;
    --text-secondary: #6b7280;
    --border-color: #e5e7eb;
    --accent: #374151;
    --accent-muted: #4b5563;
    --accent-bg: #374151;
    --accent-bg-hover: #4b5563;
    --accent-text: #ffffff;
    --accent-subtle: rgba(0, 0, 0, 0.04);
    --accent-glow: rgba(0, 0, 0, 0.1);
    --shadow: 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, 0.05);
}

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

.wavetools {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.hidden { display: none !important; }

/* Container */
.wavetools .wt-container {
    max-width: 960px;
    margin: 0 auto;
    padding: 2rem 1rem;
    display: flex;
    flex-direction: column;
}

/* Header */
.wavetools .wt-header {
    text-align: center;
    margin-bottom: 2.5rem;
}

.header-row {
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    margin-bottom: 0.5rem;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.logo-icon {
    width: 32px;
    height: 32px;
    margin: -4px 0;
    filter: drop-shadow(0 0 8px var(--accent-glow));
}

header h1 {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: -0.02em;
}

header h1 span {
    color: var(--accent-muted);
}

.tagline {
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-weight: 400;
    letter-spacing: 0.02em;
}

/* Header action buttons (blog icon + theme toggle) */
.header-actions {
    position: absolute;
    right: 0;
    display: flex;
    align-items: center;
    gap: 16px;
}

/* Blog Nav Link */
.blog-nav-link {
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--text-secondary);
    text-decoration: none;
    transition: color 0.2s ease;
}

.blog-nav-link:hover {
    color: var(--accent);
}

/* Theme Toggle */
.theme-toggle {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border: 1px solid var(--border-color);
    border-radius: 50%;
    background: var(--bg-secondary);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.25s ease;
}

.theme-toggle:hover {
    color: var(--accent);
    border-color: var(--accent-muted);
}


.theme-toggle .icon-sun,
.theme-toggle .icon-moon {
    position: absolute;
    transition: opacity 0.25s ease, transform 0.25s ease;
}

/* Dark mode: show sun icon (to switch to light) */
[data-theme="dark"] .theme-toggle .icon-sun {
    opacity: 1;
    transform: rotate(0deg);
}

[data-theme="dark"] .theme-toggle .icon-moon {
    opacity: 0;
    transform: rotate(-90deg);
}

/* Light mode: show moon icon (to switch to dark) */
[data-theme="light"] .theme-toggle .icon-sun {
    opacity: 0;
    transform: rotate(90deg);
}

[data-theme="light"] .theme-toggle .icon-moon {
    opacity: 1;
    transform: rotate(0deg);
}

/* Home Grid */
.home-grid {
    display: none;
    animation: fadeIn 0.3s ease;
}

.home-grid.active {
    display: block;
}

.category-title {
    font-size: 0.7rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.06em;
    margin-bottom: 0.75rem;
    margin-top: 1.5rem;
}

.category-title:first-child {
    margin-top: 0;
}

.tools-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0.75rem;
}

.tool-tile {
    display: flex;
    align-items: center;
    gap: 0.875rem;
    padding: 1rem;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    cursor: pointer;
    transition: all 0.2s ease;
    text-align: left;
    font-family: inherit;
    color: inherit;
}

.tool-tile:hover {
    border-color: var(--accent-muted);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.tool-tile-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: var(--radius-sm);
    background: var(--accent-subtle);
    color: var(--accent);
    flex-shrink: 0;
}

.tool-tile-content {
    display: flex;
    flex-direction: column;
    gap: 0.2rem;
    min-width: 0;
}

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

.tool-tile-desc {
    font-size: 0.7rem;
    color: var(--text-secondary);
    line-height: 1.3;
}

/* Back Button */
.back-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
    padding: 0.35rem 0;
    margin-bottom: 0.75rem;
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 0.8rem;
    font-weight: 500;
    font-family: inherit;
    cursor: pointer;
    transition: color 0.2s ease;
}

.back-btn:hover {
    color: var(--text-primary);
}

/* Main Content */
.wavetools main {
    flex: 1;
}

.tool-section {
    display: none;
    animation: fadeIn 0.3s ease;
}

.tool-section.active {
    display: block;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Card */
.card {
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 1.5rem;
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border-color);
}

.card h2 {
    font-size: 1rem;
    margin-bottom: 1.25rem;
    color: var(--text-secondary);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* Form Elements */
.form-group {
    margin-bottom: 1rem;
}

.form-group label {
    display: block;
    font-size: 0.75rem;
    color: var(--text-secondary);
    margin-bottom: 0.4rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.03em;
}

.form-row {
    display: flex;
    gap: 0.75rem;
    align-items: flex-end;
    margin-bottom: 1rem;
}

.form-row .form-group {
    flex: 1;
    margin-bottom: 0;
}

input[type="time"],
input[type="date"],
.wavetools select {
    width: 100%;
    padding: 0.65rem 0.875rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    background: var(--bg-primary);
    color: var(--text-primary);
    font-size: 0.9rem;
    font-family: inherit;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

input[type="time"]:focus,
input[type="date"]:focus,
select:focus {
    outline: none;
    border-color: var(--accent-muted);
    box-shadow: 0 0 0 2px var(--accent-glow);
}

.wavetools select {
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%2394a3b8' stroke-width='2'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 0.75rem center;
    padding-right: 2.5rem;
}

/* Swap Icon */
.swap-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    color: var(--accent);
    cursor: pointer;
    transition: all 0.25s ease;
    flex-shrink: 0;
}

.swap-icon svg {
    width: 18px;
    height: 18px;
}

.swap-icon:hover {
    background: var(--accent-bg);
    color: var(--accent-text);
    border-color: var(--accent-bg);
    transform: rotate(180deg);
}

/* Result Display */
.result {
    margin-top: 1.25rem;
    padding: 1.5rem;
    background: var(--bg-primary);
    border-radius: var(--radius);
    text-align: center;
    border: 1px solid var(--border-color);
}

/* EMI Stat Boxes */
.emi-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0.75rem;
    text-align: center;
}

.stat-box {
    background: var(--accent-subtle);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: 1rem;
}

.stat-value {
    display: block;
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--accent);
}

.stat-label {
    display: block;
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-secondary);
    margin-top: 0.25rem;
}

/* Percentage Mode Tabs */
.pct-tabs {
    display: flex;
    gap: 0;
    margin-bottom: 1.25rem;
    background: var(--bg-primary);
    padding: 0.25rem;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-color);
}

.pct-tab {
    flex: 1;
    padding: 0.6rem 0.5rem;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    font-size: 0.8rem;
    font-weight: 500;
    cursor: pointer;
    border-radius: calc(var(--radius-sm) - 2px);
    transition: all 0.2s ease;
}

.pct-tab.active {
    background: var(--accent-bg);
    color: var(--accent-text);
}

/* Percentage Answer */
.pct-answer {
    padding: 0.5rem;
}

.pct-answer-value {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--accent);
}

.pct-answer-label {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-top: 0.25rem;
}

/* Age Display */
.age-display {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
}

.age-unit {
    text-align: center;
    padding: 0.5rem 1rem;
    background: var(--accent-subtle);
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-color);
}

.age-value {
    display: block;
    font-size: 2rem;
    font-weight: 700;
    color: var(--accent);
    line-height: 1.2;
    letter-spacing: -0.02em;
}

.age-label {
    font-size: 0.65rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-top: 0.25rem;
}

.next-birthday {
    margin-top: 1.25rem;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.next-birthday strong {
    color: var(--accent);
    font-weight: 600;
}

/* DOB Picker */
.dob-picker {
    display: flex;
    gap: 0.5rem;
}

.dob-picker select {
    flex: 1;
    min-width: 0;
}

.dob-picker select:first-child {
    flex: 0.7;
}

.dob-picker select:last-child {
    flex: 0.9;
}

/* Helper Text */
.helper-text {
    display: block;
    margin-top: 0.5rem;
    font-size: 0.75rem;
    color: var(--text-secondary);
    opacity: 0.8;
}

.helper-text.hidden {
    display: none;
}

/* Unit Converter */
input[type="number"],
input[type="text"] {
    width: 100%;
    padding: 0.65rem 0.875rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    background: var(--bg-primary);
    color: var(--text-primary);
    font-size: 0.9rem;
    font-family: inherit;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

input[type="number"]:focus,
input[type="text"]:focus {
    outline: none;
    border-color: var(--accent-muted);
    box-shadow: 0 0 0 2px var(--accent-glow);
}

input[type="number"]::placeholder,
input[type="text"]::placeholder {
    color: var(--text-secondary);
    opacity: 0.6;
}

/* Conversion Result Box */
.conversion-result-box {
    display: flex;
    align-items: center;
    justify-content: center;
    flex-wrap: wrap;
    gap: 0.5rem;
    padding: 1.25rem;
    background: var(--bg-primary);
    border-radius: var(--radius);
    border: 1px solid var(--border-color);
    margin-top: 0.5rem;
}

.conversion-input {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    font-variant-numeric: tabular-nums;
}

.conversion-output {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--accent);
    font-variant-numeric: tabular-nums;
    word-break: break-all;
}

.conversion-unit {
    font-size: 0.85rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.conversion-equals {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin: 0 0.25rem;
}

.flex-1 { flex: 1; }
.flex-2 { flex: 2; }

/* Number Base Converter */
.base-results {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.75rem;
    margin-top: 0.5rem;
}

.base-result-item {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: 0.875rem;
    transition: border-color 0.2s ease;
}

.base-result-item:hover {
    border-color: var(--accent-bg);
}

.base-label {
    display: block;
    font-size: 0.7rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.04em;
    margin-bottom: 0.4rem;
}

.base-value-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.5rem;
}

.base-value {
    font-size: 1rem;
    font-weight: 600;
    color: var(--accent);
    font-family: 'SF Mono', 'Monaco', 'Inconsolata', 'Roboto Mono', monospace;
    word-break: break-all;
    flex: 1;
}

.copy-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    border: none;
    background: var(--bg-secondary);
    border-radius: 4px;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.2s ease;
    flex-shrink: 0;
}

.copy-btn:hover {
    background: var(--accent-bg);
    color: var(--accent-text);
}

.copy-btn.copied {
    background: var(--accent-bg);
    color: var(--accent-text);
}

/* JSON Formatter */
.json-textarea {
    width: 100%;
    min-height: 140px;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    background: var(--bg-primary);
    color: var(--text-primary);
    font-size: 0.85rem;
    font-family: 'SF Mono', 'Monaco', 'Inconsolata', 'Roboto Mono', monospace;
    line-height: 1.5;
    resize: vertical;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.json-textarea:focus {
    outline: none;
    border-color: var(--accent-muted);
    box-shadow: 0 0 0 2px var(--accent-glow);
}

.json-textarea::placeholder {
    color: var(--text-secondary);
    opacity: 0.6;
    font-family: inherit;
}

.json-textarea.json-output {
    background: var(--bg-secondary);
}

.json-textarea.json-error-state {
    border-color: #ef4444;
}

.json-actions {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.json-action-btn {
    flex: 1;
    padding: 0.6rem 1rem;
    border: none;
    border-radius: var(--radius-sm);
    background: var(--accent-bg);
    color: var(--accent-text);
    font-size: 0.85rem;
    font-weight: 600;
    font-family: inherit;
    cursor: pointer;
    transition: all 0.2s ease;
}

.json-action-btn:hover {
    background: var(--accent-bg-hover);
}

.json-action-btn-outline {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
}

.json-action-btn-outline:hover {
    background: var(--accent-subtle);
    color: var(--text-primary);
    border-color: var(--accent-muted);
}

.json-error {
    display: block;
    margin-bottom: 1rem;
    padding: 0.6rem 0.75rem;
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid rgba(239, 68, 68, 0.3);
    border-radius: var(--radius-sm);
    color: #ef4444;
    font-size: 0.8rem;
    font-family: 'SF Mono', 'Monaco', 'Inconsolata', 'Roboto Mono', monospace;
    line-height: 1.4;
}

.json-error.hidden {
    display: none;
}

.json-output-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 0.4rem;
}

.json-output-header label {
    font-size: 0.75rem;
    color: var(--text-secondary);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.03em;
}

.json-output-actions {
    display: flex;
    gap: 0.375rem;
}

/* Word wrap toggle */
.wrap-toggle-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 28px;
    padding: 0 0.5rem;
    border: 1px solid var(--border-color);
    background: transparent;
    border-radius: 4px;
    color: var(--text-secondary);
    font-size: 0.65rem;
    font-weight: 600;
    font-family: inherit;
    text-transform: uppercase;
    letter-spacing: 0.03em;
    cursor: pointer;
    transition: all 0.2s ease;
}

.wrap-toggle-btn:hover {
    border-color: var(--accent-muted);
    color: var(--text-primary);
}

.wrap-toggle-btn.active {
    background: var(--accent-bg);
    color: var(--accent-text);
    border-color: var(--accent-bg);
}

.json-textarea.nowrap {
    white-space: pre;
    overflow-x: auto;
    word-wrap: normal;
    overflow-wrap: normal;
}

/* Auto-resize textarea */
.json-autoresize {
    min-height: 100px;
    max-height: 60vh;
    overflow-y: auto;
    resize: none;
}

/* Expand button */
.expand-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    border: none;
    background: var(--bg-secondary);
    border-radius: 4px;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.2s ease;
    flex-shrink: 0;
}

.expand-btn:hover {
    background: var(--accent-bg);
    color: var(--accent-text);
}

.expand-btn .icon-collapse {
    display: none;
}

.expand-btn.expanded .icon-expand {
    display: none;
}

.expand-btn.expanded .icon-collapse {
    display: block;
}

/* Fullscreen overlay for expanded textarea */
.json-fullscreen-overlay {
    position: fixed;
    inset: 0;
    z-index: 1000;
    background: var(--bg-primary);
    display: flex;
    flex-direction: column;
    padding: 1rem;
    animation: fadeIn 0.2s ease;
}

.json-fullscreen-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 0.75rem;
    flex-shrink: 0;
}

.json-fullscreen-header label {
    font-size: 0.8rem;
    color: var(--text-secondary);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.03em;
}

.json-fullscreen-actions {
    display: flex;
    gap: 0.375rem;
}

.json-fullscreen-overlay .json-textarea {
    flex: 1;
    min-height: 0;
    max-height: none;
    resize: none;
}

/* Shared utility classes */
.full-width {
    width: 100%;
    margin-bottom: 1rem;
}

.crypto-toggle {
    margin-bottom: 1rem;
}

.hidden-field {
    display: none;
}

/* Encrypt / Decrypt */
input[type="password"] {
    width: 100%;
    padding: 0.65rem 0.875rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    background: var(--bg-primary);
    color: var(--text-primary);
    font-size: 0.9rem;
    font-family: inherit;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

input[type="password"]:focus {
    outline: none;
    border-color: var(--accent-muted);
    box-shadow: 0 0 0 2px var(--accent-glow);
}

input[type="password"]::placeholder {
    color: var(--text-secondary);
    opacity: 0.6;
}

/* Token Generator */
.token-length-row {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.token-length-row input[type="range"] {
    flex: 1;
    height: 4px;
    -webkit-appearance: none;
    appearance: none;
    background: var(--border-color);
    border-radius: 2px;
    outline: none;
}

.token-length-row input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--accent-bg);
    cursor: pointer;
    border: 2px solid var(--bg-primary);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
}

.token-length-row input[type="range"]::-moz-range-thumb {
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--accent-bg);
    cursor: pointer;
    border: 2px solid var(--bg-primary);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
}

.token-length-row input[type="number"] {
    width: 64px;
    padding: 0.5rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    background: var(--bg-primary);
    color: var(--text-primary);
    font-size: 0.9rem;
    font-family: inherit;
    text-align: center;
    -moz-appearance: textfield;
}

.token-length-row input[type="number"]::-webkit-inner-spin-button,
.token-length-row input[type="number"]::-webkit-outer-spin-button {
    -webkit-appearance: none;
}

.token-charsets {
    display: flex;
    gap: 0.5rem;
}

.charset-btn {
    flex: 1;
    padding: 0.6rem 0.5rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    background: transparent;
    color: var(--text-secondary);
    font-size: 0.8rem;
    font-weight: 600;
    font-family: inherit;
    cursor: pointer;
    transition: all 0.2s ease;
}

.charset-btn:hover {
    border-color: var(--accent-muted);
    color: var(--text-primary);
}

.charset-btn.active {
    background: var(--accent-bg);
    color: var(--accent-text);
    border-color: var(--accent-bg);
}

.token-result {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 1rem;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
}

.token-value {
    flex: 1;
    font-size: 0.85rem;
    font-family: 'SF Mono', 'Monaco', 'Inconsolata', 'Roboto Mono', monospace;
    color: var(--accent);
    font-weight: 500;
    word-break: break-all;
    line-height: 1.5;
}

/* Diff Checker */
.diff-inputs {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.75rem;
    margin-bottom: 1rem;
}

.diff-inputs .json-textarea {
    min-height: 150px;
    resize: vertical;
}

.diff-action-row {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.diff-action-row .json-action-btn {
    flex: 1;
}

.diff-stats {
    display: flex;
    gap: 1rem;
    padding: 0.6rem 0.75rem;
    background: var(--accent-subtle);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    margin-bottom: 1rem;
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.diff-stats.hidden {
    display: none;
}

.diff-stat-added {
    color: #22c55e;
    font-weight: 600;
}

.diff-stat-removed {
    color: #ef4444;
    font-weight: 600;
}

.diff-stat-unchanged {
    color: var(--text-secondary);
    font-weight: 600;
}

.diff-output {
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    overflow: hidden;
    max-height: 60vh;
    overflow-y: auto;
    font-family: 'SF Mono', 'Monaco', 'Inconsolata', 'Roboto Mono', monospace;
    font-size: 0.8rem;
    line-height: 1.6;
}

.diff-output.hidden {
    display: none;
}

.diff-line {
    display: flex;
    padding: 0.15rem 0.75rem;
    border-bottom: 1px solid var(--border-color);
}

.diff-line:last-child {
    border-bottom: none;
}

.diff-line-num {
    min-width: 2rem;
    text-align: right;
    color: var(--text-secondary);
    opacity: 0.5;
    padding-right: 0.75rem;
    user-select: none;
    flex-shrink: 0;
}

.diff-line-content {
    flex: 1;
    white-space: pre-wrap;
    word-break: break-all;
}

.diff-line-added {
    background: rgba(34, 197, 94, 0.1);
}

.diff-line-added .diff-line-content {
    color: #22c55e;
}

.diff-line-added .diff-line-content::before {
    content: '+ ';
    font-weight: 700;
}

.diff-line-removed {
    background: rgba(239, 68, 68, 0.1);
}

.diff-line-removed .diff-line-content {
    color: #ef4444;
}

.diff-line-removed .diff-line-content::before {
    content: '- ';
    font-weight: 700;
}

.diff-highlight-add {
    background: rgba(34, 197, 94, 0.3);
    color: inherit;
    border-radius: 2px;
    padding: 0.05rem 0;
}

.diff-highlight-del {
    background: rgba(239, 68, 68, 0.3);
    color: inherit;
    border-radius: 2px;
    padding: 0.05rem 0;
}

.diff-line-unchanged .diff-line-content::before {
    content: '  ';
}

.diff-identical {
    padding: 1rem;
    text-align: center;
    color: var(--text-secondary);
}

/* Lorem Ipsum Generator */
.lorem-option {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
    color: var(--text-secondary);
    font-size: 0.875rem;
    user-select: none;
}

.lorem-option input[type="checkbox"] {
    accent-color: var(--accent);
    width: 16px;
    height: 16px;
    flex-shrink: 0;
    cursor: pointer;
}

/* PDF Merge / Split */
.pdf-dropzone {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 2rem 1rem;
    border: 2px dashed var(--border-color);
    border-radius: var(--radius);
    background: var(--bg-primary);
    color: var(--text-secondary);
    cursor: pointer;
    transition: border-color 0.2s ease, background 0.2s ease;
    margin-bottom: 1rem;
}

.pdf-dropzone:hover,
.pdf-dropzone.dragover {
    border-color: var(--accent-muted);
    background: var(--accent-subtle);
}

.pdf-dropzone svg {
    color: var(--accent-muted);
}

.pdf-dropzone-text {
    font-size: 0.85rem;
    font-weight: 500;
}

.pdf-dropzone-hint {
    font-size: 0.75rem;
    opacity: 0.6;
}

.pdf-browse-btn {
    flex: none;
    width: auto;
    padding: 0.5rem 1.25rem;
}

.pdf-file-list {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.pdf-file-list.hidden {
    display: none;
}

.pdf-file-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.625rem 0.75rem;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
}

.pdf-file-icon {
    color: var(--accent-muted);
    flex-shrink: 0;
}

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

.pdf-file-name {
    display: block;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-primary);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.pdf-file-size {
    font-size: 0.7rem;
    color: var(--text-secondary);
}

.pdf-file-remove {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    cursor: pointer;
    border-radius: 4px;
    transition: all 0.2s ease;
    flex-shrink: 0;
}

.pdf-file-remove:hover {
    background: rgba(239, 68, 68, 0.1);
    color: #ef4444;
}

.pdf-download-area {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    margin-top: 1rem;
}

.pdf-download-area.hidden {
    display: none;
}

.pdf-download-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem;
    background: var(--accent-subtle);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
}

.pdf-download-item svg {
    color: var(--accent);
    flex-shrink: 0;
}

.pdf-download-name {
    flex: 1;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-primary);
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.pdf-download-link {
    display: inline-flex;
    align-items: center;
    gap: 0.375rem;
    padding: 0.4rem 0.75rem;
    background: var(--accent-bg);
    color: var(--accent-text);
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 600;
    text-decoration: none;
    transition: background 0.2s ease;
    flex-shrink: 0;
}

.pdf-download-link:hover {
    background: var(--accent-bg-hover);
}

/* Footer */
.wavetools .wt-footer {
    margin-top: 2.5rem;
    text-align: center;
    padding-top: 1.5rem;
}

footer p {
    font-size: 0.75rem;
    color: var(--text-secondary);
    opacity: 0.7;
}

/* Timezone Selectors */
.tz-selectors {
    margin-bottom: 1rem;
}

/* DateTime Row */
.datetime-row {
    margin-bottom: 1rem;
}

.datetime-row .form-group {
    flex: 1;
}

/* Format Toggle */
.format-toggle {
    display: flex;
    gap: 0;
    margin-bottom: 1.25rem;
    background: var(--bg-primary);
    padding: 0.25rem;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-color);
}

.format-btn {
    flex: 1;
    padding: 0.6rem 1rem;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    font-size: 0.85rem;
    font-weight: 500;
    font-family: inherit;
    cursor: pointer;
    border-radius: 6px;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.format-btn:hover {
    color: var(--text-primary);
}

.format-btn.active {
    background: var(--accent-bg);
    color: var(--accent-text);
    box-shadow: 0 2px 8px var(--accent-glow);
}


/* Big Time Display */
.time-display-container {
    display: flex;
    align-items: stretch;
    gap: 0.75rem;
}

.big-time-box {
    flex: 1;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 1.25rem 1rem;
    text-align: center;
    transition: all 0.25s ease;
}

.big-time-box.highlight {
    border-color: var(--accent-bg);
    background: var(--accent-subtle);
}

.tz-header {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    margin-bottom: 0.625rem;
}

.tz-badge {
    display: inline-block;
    padding: 0.25rem 0.625rem;
    background: var(--accent-bg);
    color: var(--accent-text);
    font-size: 0.65rem;
    font-weight: 600;
    border-radius: 4px;
    letter-spacing: 0.04em;
}

.big-time-box:not(.highlight) .tz-badge {
    margin-bottom: 0.625rem;
}

.tz-diff {
    display: inline-block;
    padding: 0.25rem 0.5rem;
    background: var(--accent-glow);
    color: var(--accent);
    font-size: 0.65rem;
    font-weight: 600;
    border-radius: 4px;
    letter-spacing: 0.02em;
}

.big-time {
    display: block;
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-primary);
    font-variant-numeric: tabular-nums;
    line-height: 1.1;
    margin-bottom: 0.35rem;
    letter-spacing: -0.02em;
}

.big-time-box.highlight .big-time {
    color: var(--accent);
}

.big-date {
    display: block;
    font-size: 0.75rem;
    color: var(--text-secondary);
    font-weight: 400;
}

/* Responsive - Tablet */
@media (max-width: 768px) {
    .wt-container {
        max-width: 100%;
        padding: 1.5rem;
    }

    .tools-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .card {
        padding: 1.25rem;
    }

    .big-time {
        font-size: 1.875rem;
    }
}

/* Responsive - Mobile */
@media (max-width: 480px) {
    .wt-container {
        padding: 1rem;
    }

    .wt-header {
        margin-bottom: 1.5rem;
    }

    .wt-header h1 {
        font-size: 1.5rem;
    }

    .logo-icon {
        width: 28px;
        height: 28px;
        margin: -3px 0;
    }

    .logo {
        gap: 0.15rem;
    }

    .header-row {
        justify-content: space-between;
    }

    .header-actions {
        position: static;
    }

    .theme-toggle {
        width: 36px;
        height: 36px;
    }

    .theme-toggle svg {
        width: 18px;
        height: 18px;
    }

    .tagline {
        font-size: 0.8rem;
        text-align: left;
    }

    /* Grid */
    .tools-grid {
        grid-template-columns: 1fr;
    }

    .emi-stats {
        grid-template-columns: 1fr;
    }

    /* Card */
    .card {
        padding: 1rem;
        border-radius: var(--radius-sm);
    }

    .card h2 {
        font-size: 0.85rem;
        margin-bottom: 1rem;
    }

    /* Form Elements - Touch Friendly */
    .form-row {
        flex-direction: column;
        align-items: stretch;
        gap: 0.75rem;
    }

    .form-row.tz-selectors {
        gap: 0.5rem;
    }

    input[type="time"],
    input[type="date"],
    select {
        padding: 0.75rem 0.875rem;
        font-size: 1rem;
        min-height: 48px;
    }

    .swap-icon {
        align-self: center;
        transform: rotate(90deg);
        width: 40px;
        height: 40px;
    }

    .swap-icon:hover {
        transform: rotate(270deg);
    }

    /* Date Time Row stays horizontal */
    .datetime-row {
        flex-direction: row;
        gap: 0.5rem;
    }

    .datetime-row .form-group {
        flex: 1;
    }

    /* Format Toggle */
    .format-toggle {
        margin-bottom: 1rem;
    }

    .format-btn {
        padding: 0.75rem 0.5rem;
        font-size: 0.8rem;
        min-height: 44px;
    }

    /* Big Time Display - Stack Vertically */
    .time-display-container {
        flex-direction: column;
        gap: 0.75rem;
    }

    .big-time-box {
        padding: 1.25rem;
    }

    .big-time {
        font-size: 2.75rem;
    }

    .big-date {
        font-size: 0.9rem;
    }

    .tz-badge {
        font-size: 0.7rem;
        padding: 0.3rem 0.75rem;
    }

    .tz-diff {
        font-size: 0.7rem;
        padding: 0.3rem 0.6rem;
    }

    /* Age Calculator */
    .age-display {
        gap: 0.5rem;
    }

    .age-unit {
        padding: 0.75rem 0.5rem;
        flex: 1;
    }

    .age-value {
        font-size: 1.75rem;
    }

    .age-label {
        font-size: 0.6rem;
    }


    .next-birthday {
        font-size: 0.8rem;
    }

    /* DOB Picker */
    .dob-picker {
        flex-wrap: wrap;
        gap: 0.5rem;
    }

    .dob-picker select {
        min-height: 48px;
        font-size: 1rem;
    }

    .dob-picker select:first-child {
        flex: 1 1 25%;
    }

    .dob-picker select:nth-child(2) {
        flex: 1 1 40%;
    }

    .dob-picker select:last-child {
        flex: 1 1 30%;
    }

    /* Footer */
    .wt-footer {
        margin-top: 1.5rem;
        padding-top: 1rem;
    }

    /* JSON Formatter */
    .json-textarea {
        min-height: 120px;
        font-size: 0.8rem;
    }

    .json-actions {
        gap: 0.375rem;
    }

    .json-action-btn {
        padding: 0.75rem 0.5rem;
        font-size: 0.8rem;
        min-height: 44px;
    }

    /* Encrypt / Decrypt */
    input[type="password"] {
        padding: 0.75rem 0.875rem;
        font-size: 1rem;
        min-height: 48px;
    }

    /* Token Generator */
    .charset-btn {
        padding: 0.75rem 0.25rem;
        font-size: 0.75rem;
        min-height: 44px;
    }

    .token-length-row input[type="number"] {
        min-height: 44px;
    }

    /* Diff Checker */
    .diff-inputs {
        grid-template-columns: 1fr;
    }

    .diff-inputs .json-textarea {
        min-height: 120px;
    }

    .diff-stats {
        flex-wrap: wrap;
        gap: 0.5rem;
    }

    .diff-output {
        font-size: 0.75rem;
    }

    /* Unit & Base Converter */
    input[type="number"],
    input[type="text"] {
        padding: 0.75rem 0.875rem;
        font-size: 1rem;
        min-height: 48px;
    }

    .conversion-result-box {
        padding: 1rem;
        gap: 0.35rem;
    }

    .conversion-input {
        font-size: 1.1rem;
    }

    .conversion-output {
        font-size: 1.25rem;
    }

    .base-results {
        grid-template-columns: 1fr;
        gap: 0.5rem;
    }

    .base-result-item {
        padding: 0.75rem;
    }

    /* PDF Tool */
    .pdf-dropzone {
        padding: 1.5rem 1rem;
    }

    .pdf-file-name {
        font-size: 0.8rem;
    }
}

/* Extra Small Devices */
@media (max-width: 360px) {
    .wt-container {
        padding: 0.75rem;
    }

    .wt-header h1 {
        font-size: 1.35rem;
    }

    .big-time {
        font-size: 2.25rem;
    }

    .age-value {
        font-size: 1.5rem;
    }

    .dob-picker select:first-child,
    .dob-picker select:nth-child(2),
    .dob-picker select:last-child {
        flex: 1 1 100%;
    }

    .base-results {
        grid-template-columns: 1fr;
    }
}