:root {
    --tt-page-bg: var(--hero-bg-start);
    --tt-card-bg: var(--bg-primary);
    --tt-card-border: #dfe3ff;
    --tt-text-primary: #111b3e;
    --tt-text-secondary: #495074;
    --tt-muted: #6b7394;
    --tt-accent: #3f5bff;
    --tt-accent-strong: #2d42d9;
    --tt-surface-soft: var(--color-indigo-soft);
    --tt-focus-ring: rgba(63, 91, 255, 0.35);
    --tt-badge-bg: rgba(63, 91, 255, 0.12);
    --tt-badge-text: #273377;
    --tt-shadow-soft: 0 16px 36px rgba(22, 32, 68, 0.1);
    --tt-shadow-strong: 0 26px 52px rgba(22, 32, 68, 0.14);
    --tt-added-bg: rgba(33, 150, 83, 0.12);
    --tt-added-border: rgba(33, 150, 83, 0.42);
    --tt-added-text: #1f5f3a;
    --tt-removed-bg: rgba(219, 76, 76, 0.14);
    --tt-removed-border: rgba(219, 76, 76, 0.4);
    --tt-removed-text: #6c1c1c;
    --tt-context-bg: rgba(63, 91, 255, 0.06);
    --tt-context-border: rgba(63, 91, 255, 0.18);
}

[data-theme="dark"] {
    --tt-page-bg: #0f172a;
    --tt-card-border: #374151;
    --tt-text-primary: #f8fafc;
    --tt-text-secondary: #cbd5e1;
    --tt-muted: #94a3b8;
    --tt-accent: #60a5fa;
    --tt-accent-strong: #3b82f6;
    --tt-badge-text: #93c5fd;
    --tt-added-border: #374151;
    --tt-removed-border: #374151;
    --tt-context-border: #374151;
}

body.tools-page {
    background: var(--tt-page-bg);
    color: var(--tt-text-secondary);
}

.tool-hero {
    background: linear-gradient(140deg, rgba(63, 91, 255, 0.16), rgba(63, 91, 255, 0.04));
    padding: 4.4rem 0 3.4rem;
}

.tool-hero-content {
    max-width: 820px;
    margin: 0 auto;
    text-align: center;
}

/* .tool-icon-large - using global style */

.tool-title {
    font-size: clamp(2.2rem, 4vw, 3rem);
    color: var(--tt-text-primary);
    margin-bottom: 0.8rem;
}

.tool-description {
    font-size: 1.05rem;
    color: var(--tt-text-secondary);
    margin-bottom: 1.65rem;
}

.tool-meta {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.meta-pill {
    background: var(--tt-badge-bg);
    color: var(--tt-badge-text);
    padding: 0.5rem 1rem;
    border-radius: 999px;
    font-size: 0.9rem;
    font-weight: 600;
}

.tool-interface {
    padding: 3.5rem 0 4rem;
}

.tool-layout {
    display: grid;
    grid-template-columns: repeat(12, minmax(0, 1fr));
    gap: 1.8rem;
}

.tool-card {
    background: var(--tt-card-bg);
    border: 1px solid var(--tt-card-border);
    border-radius: 1.35rem;
    box-shadow: var(--tt-shadow-soft);
    padding: 1.85rem;
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.tool-card.info-card {
    background: var(--tt-surface-soft);
    border-style: dashed;
    box-shadow: none;
}

.section-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
}

.section-header h2 {
    font-size: 1.35rem;
    color: var(--tt-text-primary);
    margin: 0;
}

.toolbar {
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
}

.button-row {
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
}

.btn {
    border: 0;
    border-radius: 0.85rem;
    font-weight: 600;
    font-size: 0.95rem;
    padding: 0.75rem 1.1rem;
    cursor: pointer;
    transition: transform 0.15s ease, box-shadow 0.15s ease, background-color 0.15s ease, color 0.15s ease;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.45rem;
}

.btn:focus-visible {
    outline: none;
    box-shadow: 0 0 0 4px var(--tt-focus-ring);
}

.btn-primary {
    background: var(--tt-accent);
    color: var(--bg-primary);
    box-shadow: var(--tt-shadow-strong);
}

.btn-primary:hover {
    transform: translateY(-1px);
    background: var(--tt-accent-strong);
}

.btn-secondary {
    background: var(--tt-surface-soft);
    color: var(--tt-text-primary);
    border: 1px solid var(--tt-card-border);
}

.btn-secondary:hover {
    transform: translateY(-1px);
}

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

.btn-outline:hover {
    border-color: var(--tt-accent);
    color: var(--tt-accent-strong);
}

.text-input {
    width: 100%;
    padding: 0.85rem 1rem;
    border-radius: 0.9rem;
    border: 1px solid var(--tt-card-border);
    background: var(--bg-primary);
    color: var(--tt-text-primary);
    font-size: 1rem;
    transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.text-input.large {
    min-height: 280px;
    resize: vertical;
    font-family: "Inter", "Segoe UI", system-ui, -apple-system, sans-serif;
    line-height: 1.65;
}

.text-input:focus {
    border-color: var(--tt-accent);
    box-shadow: 0 0 0 4px var(--tt-focus-ring);
    outline: none;
}

.notification {
    padding: 0.85rem 1rem;
    border-radius: 0.95rem;
    background: rgba(63, 91, 255, 0.12);
    border: 1px solid rgba(63, 91, 255, 0.28);
    color: var(--tt-text-primary);
    font-size: 0.9rem;
}

.notification.hidden {
    display: none;
}

.compare-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1.5rem;
}

.compare-panel {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.panel-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.75rem;
}

.panel-header h3 {
    margin: 0;
    font-size: 1.1rem;
    color: var(--tt-text-primary);
}

.option-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 0.75rem;
}

.checkbox {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    font-size: 0.95rem;
    color: var(--tt-text-secondary);
}

.checkbox input[type="checkbox"] {
    width: 1.1rem;
    height: 1.1rem;
    border-radius: 0.3rem;
    border: 1px solid var(--tt-card-border);
    accent-color: var(--tt-accent);
}

.summary-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: 1rem;
}

.summary-card {
    background: var(--tt-surface-soft);
    border-radius: 1rem;
    border: 1px solid rgba(63, 91, 255, 0.14);
    padding: 1.1rem 1.25rem;
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
    min-height: 108px;
}

.summary-label {
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--tt-muted);
}

.summary-value {
    font-size: 1.6rem;
    font-weight: 700;
    color: var(--tt-text-primary);
}

.summary-note {
    font-size: 0.95rem;
    color: var(--tt-muted);
    line-height: 1.6;
}

.diff-output {
    background: var(--tt-surface-soft);
    border-radius: 1.1rem;
    border: 1px solid rgba(63, 91, 255, 0.18);
    padding: 1.25rem 1.4rem;
    min-height: 260px;
    font-family: "JetBrains Mono", "Fira Code", Consolas, monospace;
    font-size: 0.95rem;
    line-height: 1.7;
    color: var(--tt-text-primary);
    overflow: auto;
    var(--bg-primary)-space: pre-wrap;
    word-break: break-word;
}

.diff-output:focus-visible {
    outline: none;
    box-shadow: 0 0 0 4px var(--tt-focus-ring);
}

.diff-line {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 0.75rem;
    padding: 0.35rem 0.65rem;
    margin: 0;
    border-radius: 0.7rem;
    border: 1px solid transparent;
    align-items: start;
}

.diff-line + .diff-line {
    margin-top: 0.35rem;
}

.diff-symbol {
    font-weight: 700;
    font-size: 0.95rem;
    color: inherit;
}

.diff-content {
    var(--bg-primary)-space: pre-wrap;
    word-break: break-word;
}

.diff-line.added {
    background: var(--tt-added-bg);
    border-color: var(--tt-added-border);
    color: var(--tt-added-text);
}

.diff-line.removed {
    background: var(--tt-removed-bg);
    border-color: var(--tt-removed-border);
    color: var(--tt-removed-text);
}

.diff-line.context {
    background: var(--tt-context-bg);
    border-color: var(--tt-context-border);
    color: var(--tt-text-secondary);
}

.diff-line.context .diff-symbol {
    color: var(--tt-muted);
}

.diff-line.blank .diff-content {
    opacity: 0.65;
    font-style: italic;
}

.tips-list {
    margin: 0;
    padding-left: 1.2rem;
    display: flex;
    flex-direction: column;
    gap: 0.6rem;
    color: var(--tt-text-secondary);
    font-size: 0.95rem;
    line-height: 1.6;
}

.tips-list code {
    background: rgba(63, 91, 255, 0.1);
    border-radius: 0.45rem;
    padding: 0.2rem 0.4rem;
    font-size: 0.85rem;
}

.compare-card .notification {
    margin-top: 0.5rem;
}

@media (max-width: 1024px) {
    .tool-layout {
        grid-template-columns: repeat(6, minmax(0, 1fr));
    }
}

@media (max-width: 768px) {
    .tool-layout {
        grid-template-columns: repeat(1, minmax(0, 1fr));
    }

    .compare-grid {
        grid-template-columns: repeat(1, minmax(0, 1fr));
    }

    .section-header, .panel-header {
        flex-direction: column;
        align-items: flex-start;
    }

    .toolbar, .button-row {
        width: 100%;
    }

    .toolbar .btn, .button-row .btn {
        width: 100%;
    }
}

/* Dark mode element overrides */
[data-theme="dark"] .tool-card {
    background: var(--bg-card, #1e293b);
    border-color: var(--border-color, #334155);
}

[data-theme="dark"] .tool-hero {
    background: linear-gradient(135deg, #1e293b 0%, #0f172a 100%);
}

[data-theme="dark"] input,
[data-theme="dark"] select,
[data-theme="dark"] textarea {
    background: var(--input-bg, #1e293b);
    color: var(--text-primary, #f8fafc);
    border-color: var(--border-color, #334155);
}

[data-theme="dark"] input::placeholder,
[data-theme="dark"] textarea::placeholder {
    color: var(--text-muted, #64748b);
}

[data-theme="dark"] .tab-btn.active {
    color: white;
}

[data-theme="dark"] label {
    color: var(--text-primary, #f8fafc);
}

[data-theme="dark"] h1, [data-theme="dark"] h2, [data-theme="dark"] h3,
[data-theme="dark"] h4, [data-theme="dark"] h5, [data-theme="dark"] h6 {
    color: var(--text-primary, #f8fafc);
}

[data-theme="dark"] p {
    color: var(--text-secondary, #cbd5e1);
}

/* Notification dark mode */
[data-theme="dark"] .notification.success {
    background: rgba(34, 197, 94, 0.2);
    border-color: rgba(34, 197, 94, 0.4);
    color: #4ade80;
}

[data-theme="dark"] .notification.warn {
    background: rgba(251, 191, 36, 0.2);
    border-color: rgba(251, 191, 36, 0.4);
    color: #fbbf24;
}

[data-theme="dark"] .notification.error {
    background: rgba(248, 113, 113, 0.2);
    border-color: rgba(248, 113, 113, 0.4);
    color: #f87171;
}

[data-theme="dark"] .notification.info {
    background: rgba(96, 165, 250, 0.2);
    border-color: rgba(96, 165, 250, 0.4);
    color: #60a5fa;
}