:root {
    --card-bg: var(--bg-card);
    --card-border: rgba(15, 23, 42, 0.1);
    --card-shadow: 0 20px 45px -30px rgba(15, 23, 42, 0.35);
    --accent: var(--primary-color);
    --accent-soft: var(--ring-color);
    --text-primary: var(--text-primary);
    --text-secondary: var(--text-secondary);
    --surface: rgba(248, 250, 252, 0.75);
    --chip-bg: rgba(37, 99, 235, 0.08);
    --chip-text: var(--primary-hover);
    --border-radius-lg: 28px;
    --border-radius-md: 20px;
}

[data-theme="dark"] {
    --card-border: #374151;
    --border-radius-lg: #374151;
    --border-radius-md: #374151;
}

body.tools-page {
    background: radial-gradient(circle at top left, rgba(37, 99, 235, 0.08), rgba(37, 99, 235, 0)) fixed,
        radial-gradient(circle at bottom right, rgba(14, 165, 233, 0.1), rgba(14, 165, 233, 0));
    color: var(--text-primary);
}

.tool-hero {
    padding: 72px 0 48px;
}

.tool-hero-content {
    max-width: 720px;
    margin: 0 auto;
    text-align: center;
    -webkit-backdrop-filter: blur(18px);
    backdrop-filter: blur(18px);
    background: var(--surface);
    border-radius: var(--border-radius-lg);
    padding: 48px 40px;
    border: 1px solid rgba(148, 163, 184, 0.2);
    box-shadow: var(--card-shadow);
}

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

.tool-title {
    font-size: clamp(2rem, 1.2rem + 2vw, 2.8rem);
    margin-bottom: 16px;
}

.tool-description {
    color: var(--text-secondary);
    margin: 0 auto 28px;
    max-width: 600px;
    line-height: 1.65;
}

.tool-meta {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 12px;
}

.meta-pill {
    background: var(--chip-bg);
    color: var(--chip-text);
    padding: 10px 18px;
    border-radius: 999px;
    font-weight: 600;
    font-size: 0.9rem;
}

.tool-interface {
    padding: 32px 0 96px;
}

.tool-layout {
    display: grid;
    grid-template-columns: repeat(12, minmax(0, 1fr));
    gap: 24px;
}

.tool-card {
    background: var(--card-bg);
    border-radius: var(--border-radius-md);
    border: 1px solid var(--card-border);
    box-shadow: var(--card-shadow);
    -webkit-backdrop-filter: blur(14px);
    backdrop-filter: blur(14px);
    padding: 28px;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.span-4 {
    grid-column: span 12;
}

.span-8 {
    grid-column: span 12;
}

.span-12 {
    grid-column: span 12;
}

@media (min-width: 992px) {
    .span-4 {
        grid-column: span 4;
    }
    .span-8 {
        grid-column: span 8;
    }
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 12px;
}

.section-header h2 {
    margin: 0;
    font-size: 1.25rem;
}

.toolbar {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.btn {
    border-radius: 999px;
    border: none;
    padding: 10px 18px;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.16s ease, box-shadow 0.16s ease, background 0.16s ease;
}

.btn-primary {
    background: var(--accent);
    color: var(--bg-primary);
    box-shadow: 0 14px 30px -18px rgba(37, 99, 235, 0.9);
}

.btn-primary:disabled,
.btn:disabled {
    opacity: 0.55;
    cursor: not-allowed;
}

.btn-secondary {
    background: rgba(15, 23, 42, 0.08);
    color: var(--text-primary);
}

.btn-outline {
    background: transparent;
    border: 1px solid rgba(37, 99, 235, 0.4);
    color: var(--accent);
}

.btn:hover:not(:disabled) {
    transform: translateY(-1px);
}

.panel-group {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.panel {
    background: var(--bg-glass);
    border-radius: 18px;
    padding: 20px;
    border: 1px solid rgba(148, 163, 184, 0.2);
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.panel h3 {
    margin: 0;
    font-size: 1rem;
}

.tool-buttons {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 10px;
}

.tool-button {
    background: rgba(37, 99, 235, 0.08);
    border: 1px solid transparent;
    border-radius: 14px;
    padding: 12px 14px;
    font-weight: 600;
    color: var(--text-primary);
    cursor: pointer;
    text-align: left;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: background 0.18s ease, border 0.18s ease, transform 0.18s ease;
}

.tool-button.active,
.tool-button:focus-visible {
    background: rgba(37, 99, 235, 0.16);
    border-color: rgba(37, 99, 235, 0.4);
    box-shadow: 0 12px 24px -18px rgba(37, 99, 235, 0.8);
}

.tool-button:hover {
    transform: translateY(-1px);
}

.field {
    display: flex;
    flex-direction: column;
    gap: 8px;
    font-size: 0.95rem;
    color: var(--text-secondary);
}

.field span:first-child {
    font-weight: 600;
    color: var(--text-primary);
}

.text-input,
select,
input[type="color"],
input[type="range"] {
    width: 100%;
}

.text-input,
select {
    border-radius: 14px;
    border: 1px solid rgba(148, 163, 184, 0.3);
    padding: 10px 12px;
    background: rgba(248, 250, 252, 0.9);
    color: var(--text-primary);
}

input[type="color"] {
    height: 42px;
    border-radius: 14px;
    border: 1px solid rgba(148, 163, 184, 0.3);
    background: rgba(248, 250, 252, 0.9);
    cursor: pointer;
}

input[type="range"] {
    accent-color: var(--accent);
}

.range-value {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.toggle {
    display: flex;
    align-items: center;
    gap: 10px;
}

.button-group {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.helper-text {
    font-size: 0.85rem;
    color: var(--text-secondary);
    min-height: 1.2em;
}

.board-card {
    position: relative;
}

.board-wrapper {
    position: relative;
    border-radius: 20px;
    overflow: hidden;
    border: 1px solid rgba(148, 163, 184, 0.35);
    background: var(--bg-primary);
    aspect-ratio: 3 / 2;
}

.board-wrapper canvas {
    width: 100%;
    height: 100%;
    display: block;
    cursor: crosshair;
    touch-action: none;
    background: transparent;
}

.board-guides {
    position: absolute;
    inset: 0;
    pointer-events: none;
    opacity: 0.18;
    background:
        radial-gradient(circle at 18% 20%, var(--ring-color), transparent 60%),
        radial-gradient(circle at 82% 78%, rgba(14, 165, 233, 0.12), transparent 55%);
    transition: opacity 0.25s ease;
}

.board-shortcuts {
    background: rgba(15, 23, 42, 0.04);
    border-radius: 16px;
    padding: 14px 16px;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.helper-text.error {
    color: var(--text-danger);
}

.board-shortcuts kbd {
    background: rgba(15, 23, 42, 0.08);
    padding: 4px 8px;
    border-radius: 6px;
    font-size: 0.85rem;
    font-weight: 600;
}

.text-editor {
    position: absolute;
    min-width: 120px;
    min-height: 32px;
    border-radius: 12px;
    border: 1px solid rgba(37, 99, 235, 0.4);
    padding: 8px 10px;
    background: rgba(255, 255, 255, 0.95);
    color: var(--text-primary);
    box-shadow: 0 18px 35px -30px rgba(15, 23, 42, 0.7);
    display: none;
    resize: none;
    outline: none;
    font: 600 16px/1.4 "Inter", system-ui, -apple-system, blinkmacsystemfont, "Segoe UI", sans-serif;
}

.text-editor.visible {
    display: block;
}

.info-card {
    gap: 16px;
}

.tips-grid {
    display: grid;
    gap: 18px;
}

.tip-block {
    background: rgba(255, 255, 255, 0.65);
    border-radius: 18px;
    border: 1px solid rgba(148, 163, 184, 0.24);
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.tip-block h3 {
    margin: 0;
    font-size: 1.05rem;
}

.tip-block p {
    margin: 0;
    color: var(--text-secondary);
    line-height: 1.6;
}

footer.site-footer {
    margin-top: 64px;
    background: rgba(15, 23, 42, 0.05);
}

.board-meta {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

@media (min-width: 768px) {
    .tips-grid {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }
}

/* 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);
}