:root {
    --base-page-bg: var(--hero-bg-start);
    --base-card-bg: rgba(255, 255, 255, 0.9);
    --base-card-border: rgba(120, 125, 210, 0.18);
    --base-text-primary: #132052;
    --base-text-secondary: #3e4a72;
    --base-muted: #6c79a4;
    --base-accent: #4756f0;
    --base-accent-soft: rgba(71, 86, 240, 0.12);
    --base-focus-ring: rgba(71, 86, 240, 0.28);
    --base-badge-bg: rgba(71, 86, 240, 0.12);
    --base-badge-text: #3641b1;
    --base-badge-muted-bg: rgba(142, 150, 210, 0.2);
    --base-badge-muted-text: #4d5a94;
    --base-shadow-soft: 0 20px 40px rgba(23, 33, 80, 0.12);
    --base-shadow-strong: 0 26px 52px rgba(27, 40, 94, 0.18);
    --base-success-bg: rgba(66, 214, 156, 0.18);
    --base-success-border: rgba(66, 214, 156, 0.36);
    --base-success-text: #0f6544;
    --base-warn-bg: rgba(255, 196, 45, 0.22);
    --base-warn-border: rgba(255, 196, 45, 0.36);
    --base-warn-text: #7d5400;
    --base-error-bg: rgba(240, 96, 96, 0.18);
    --base-error-border: rgba(240, 96, 96, 0.34);
    --base-error-text: #8c1f24;
    --base-table-header: rgba(71, 86, 240, 0.12);
    --base-table-row: rgba(71, 86, 240, 0.06);
}

[data-theme="dark"] {
    --base-page-bg: #0f172a;
    --base-card-border: #374151;
    --base-text-primary: #f8fafc;
    --base-text-secondary: #cbd5e1;
    --base-muted: #94a3b8;
    --base-accent: #60a5fa;
    --base-accent-soft: #60a5fa;
    --base-badge-text: #93c5fd;
    --base-badge-muted-text: #94a3b8;
    --base-success-border: #374151;
    --base-success-text: #4ade80;
    --base-warn-border: #374151;
    --base-warn-text: #fbbf24;
    --base-error-border: #374151;
    --base-error-text: #f87171;
}

body.tools-page {
    background: radial-gradient(circle at top, rgba(180, 186, 255, 0.28), transparent 58%), var(--base-page-bg);
    color: var(--base-text-secondary);
}

.tool-hero {
    background: linear-gradient(150deg, rgba(71, 86, 240, 0.24), rgba(125, 134, 227, 0.08));
    padding: 4rem 0 3.2rem;
    text-align: center;
}

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

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

.tool-title {
    font-size: clamp(2.1rem, 4vw, 3rem);
    color: var(--base-text-primary);
    margin-bottom: 0.8rem;
}

.tool-description {
    font-size: 1.05rem;
    color: rgba(30, 41, 103, 0.76);
    margin-bottom: 1.6rem;
}

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

.meta-pill {
    background: var(--base-badge-bg);
    color: var(--base-badge-text);
    padding: 0.5rem 1.1rem;
    border-radius: 999px;
    font-weight: 600;
    font-size: 0.88rem;
    letter-spacing: 0.02em;
}

.tool-interface {
    padding: 3.2rem 0 4rem;
}

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

.tool-card {
    background: var(--base-card-bg);
    border: 1px solid var(--base-card-border);
    border-radius: 1.35rem;
    box-shadow: var(--base-shadow-soft);
    padding: 1.85rem;
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
    -webkit-backdrop-filter: blur(14px);
    backdrop-filter: blur(14px);
}

.tool-card.info-card {
    background: rgba(255, 255, 255, 0.88);
    border-style: dashed;
}

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

.section-header h2 {
    margin: 0;
    font-size: 1.32rem;
    color: var(--base-text-primary);
}

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

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

.quick-bases {
    display: flex;
    gap: 0.6rem;
    flex-wrap: wrap;
}

.btn {
    border: 1px solid transparent;
    border-radius: 0.85rem;
    font-weight: 600;
    font-size: 0.94rem;
    padding: 0.72rem 1.05rem;
    cursor: pointer;
    transition: transform 0.16s ease, box-shadow 0.16s ease, background-color 0.16s ease, color 0.16s ease;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.45rem;
    color: var(--base-text-primary);
    background: rgba(243, 245, 255, 0.9);
}

.btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 8px 18px rgba(25, 36, 90, 0.08);
}

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

.btn-primary {
    background: linear-gradient(135deg, rgba(71, 86, 240, 0.95), rgba(111, 125, 250, 0.95));
    color: var(--bg-primary);
    box-shadow: var(--base-shadow-strong);
}

.btn-primary:hover {
    background: linear-gradient(135deg, rgba(84, 99, 252, 0.97), rgba(127, 140, 255, 0.97));
}

.btn-secondary {
    background: rgba(233, 234, 255, 0.82);
    border: 1px solid rgba(120, 130, 210, 0.32);
    color: var(--base-text-primary);
}

.btn-outline {
    background: transparent;
    border: 1px solid rgba(71, 86, 240, 0.3);
    color: var(--base-accent);
}

.btn-outline:hover {
    background: rgba(71, 86, 240, 0.1);
}

.btn-xs {
    padding: 0.42rem 0.65rem;
    font-size: 0.82rem;
    border-radius: 0.65rem;
    border: 1px solid rgba(120, 130, 210, 0.28);
    background: rgba(246, 247, 255, 0.92);
}

.swap-btn {
    align-self: flex-end;
    min-width: 96px;
}

.swap-icon {
    font-size: 1.1rem;
}

.text-input {
    width: 100%;
    padding: 0.9rem 1.1rem;
    border-radius: 0.95rem;
    border: 1px solid rgba(140, 146, 210, 0.32);
    background: rgba(249, 249, 255, 0.88);
    color: var(--base-text-primary);
    font-size: 1rem;
    transition: border-color 0.16s ease, box-shadow 0.16s ease;
}

.text-input:focus {
    border-color: rgba(71, 86, 240, 0.6);
    box-shadow: 0 0 0 4px var(--base-focus-ring);
    outline: none;
}

.text-input::placeholder {
    color: rgba(93, 104, 150, 0.66);
}

.select-input {
    border: 1px solid rgba(140, 146, 210, 0.32);
    border-radius: 0.85rem;
    padding: 0.72rem 0.95rem;
    font-size: 0.96rem;
    background: rgba(249, 249, 255, 0.92);
    color: var(--base-text-primary);
    transition: border-color 0.16s ease, box-shadow 0.16s ease;
}

.select-input:focus {
    border-color: rgba(71, 86, 240, 0.6);
    box-shadow: 0 0 0 4px var(--base-focus-ring);
    outline: none;
}

.field {
    display: flex;
    flex-direction: column;
    gap: 0.45rem;
}

.field label {
    font-weight: 600;
    font-size: 0.95rem;
    color: var(--base-text-primary);
}

.multi-field {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1rem;
    align-items: end;
}

.helper-row {
    display: flex;
    justify-content: space-between;
    gap: 1rem;
    font-size: 0.9rem;
    color: var(--base-muted);
    flex-wrap: wrap;
}

.helper-text {
    font-size: 0.9rem;
    color: var(--base-muted);
}

.notification {
    padding: 0.85rem 1rem;
    border-radius: 0.95rem;
    border: 1px solid rgba(120, 130, 210, 0.28);
    background: rgba(238, 240, 255, 0.9);
    color: var(--base-text-secondary);
    font-size: 0.9rem;
}

.notification.hidden {
    display: none;
}

.notification.success {
    background: var(--base-success-bg);
    border-color: var(--base-success-border);
    color: var(--base-success-text);
}

.notification.warn {
    background: var(--base-warn-bg);
    border-color: var(--base-warn-border);
    color: var(--base-warn-text);
}

.notification.error {
    background: var(--base-error-bg);
    border-color: var(--base-error-border);
    color: var(--base-error-text);
}

.options-stack {
    border: 1px solid rgba(120, 130, 210, 0.24);
    border-radius: 1.1rem;
    padding: 1.25rem;
    display: flex;
    flex-direction: column;
    gap: 1.15rem;
    background: rgba(248, 249, 255, 0.92);
}

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

.checkbox {
    display: flex;
    align-items: flex-start;
    gap: 0.65rem;
    font-size: 0.95rem;
    color: var(--base-text-secondary);
    line-height: 1.45;
}

.checkbox input[type="checkbox"] {
    width: 1.1rem;
    height: 1.1rem;
    border-radius: 0.3rem;
    border: 1px solid rgba(120, 130, 210, 0.36);
    background: rgba(255, 255, 255, 0.9);
    accent-color: var(--base-accent);
}

.badge {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0.45rem 0.85rem;
    border-radius: 999px;
    background: var(--base-badge-bg);
    color: var(--base-badge-text);
    font-size: 0.84rem;
    font-weight: 600;
}

.badge.muted {
    background: var(--base-badge-muted-bg);
    color: var(--base-badge-muted-text);
}

.result-display {
    background: linear-gradient(135deg, rgba(246, 248, 255, 0.96), rgba(229, 233, 255, 0.92));
    border-radius: 1.2rem;
    padding: 1.6rem;
    position: relative;
    overflow: hidden;
    box-shadow: inset 0 32px 60px rgba(170, 178, 240, 0.32);
}

.result-display::after {
    content: "";
    position: absolute;
    inset: 0;
    background-image: radial-gradient(rgba(120, 140, 255, 0.18) 1px, transparent 0);
    background-size: 28px 28px;
    opacity: 0.45;
    pointer-events: none;
}

.result-value {
    font-size: clamp(1.6rem, 3vw, 2.3rem);
    font-weight: 700;
    line-height: 1.3;
    color: var(--base-text-primary);
    word-break: break-word;
}

.result-formula {
    font-size: 0.95rem;
    color: rgba(30, 41, 103, 0.76);
    line-height: 1.6;
    word-break: break-word;
}

.conversion-table-wrapper {
    border: 1px solid rgba(120, 130, 210, 0.28);
    border-radius: 1.15rem;
    overflow: hidden;
    background: rgba(249, 250, 255, 0.94);
    box-shadow: inset 0 20px 46px rgba(121, 130, 210, 0.18);
}

.conversion-table {
    width: 100%;
    border-collapse: collapse;
    font-family: "Inter", "Segoe UI", system-ui, -apple-system, sans-serif;
    color: var(--base-text-primary);
}

.conversion-table thead {
    background: var(--base-table-header);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-size: 0.78rem;
    color: rgba(35, 44, 110, 0.72);
}

.conversion-table th,
.conversion-table td {
    padding: 0.85rem 1rem;
    text-align: left;
    border-bottom: 1px solid rgba(120, 130, 210, 0.22);
}

.conversion-table td:nth-child(4) {
    font-variant-numeric: tabular-nums;
    word-break: break-word;
}

.conversion-table tbody tr:nth-child(even) {
    background: var(--base-table-row);
}

.conversion-table tbody tr:hover {
    background: rgba(71, 86, 240, 0.12);
}

.conversion-table tbody tr.highlight {
    background: rgba(71, 86, 240, 0.18);
    font-weight: 600;
}

.conversion-table .placeholder td {
    padding: 2rem 1rem;
    text-align: center;
    color: rgba(70, 79, 126, 0.7);
}

.stats-card {
    gap: 1.1rem;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 1rem;
}

.stat-item {
    background: rgba(239, 241, 255, 0.92);
    border-radius: 1rem;
    border: 1px solid rgba(120, 130, 210, 0.24);
    padding: 1.05rem 1.15rem;
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
}

.stat-label {
    font-size: 0.82rem;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: rgba(67, 78, 130, 0.72);
}

.stat-value {
    font-size: 1.45rem;
    font-weight: 700;
    color: var(--base-text-primary);
    word-break: break-word;
}

.stats-note {
    font-size: 0.95rem;
    color: rgba(57, 66, 116, 0.74);
    line-height: 1.6;
}

.info-card .tips-list {
    margin: 0;
    padding-left: 1.25rem;
    display: flex;
    flex-direction: column;
    gap: 0.6rem;
    color: rgba(39, 50, 108, 0.76);
    font-size: 0.95rem;
    line-height: 1.6;
}

.info-card strong {
    color: var(--base-text-primary);
}

.span-12 { grid-column: span 12; }
.span-7 { grid-column: span 7; }
.span-5 { grid-column: span 5; }

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

    .span-12 { grid-column: span 6; }
    .span-7 { grid-column: span 6; }
    .span-5 { grid-column: span 6; }
}

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

    .span-12,
    .span-7,
    .span-5 {
        grid-column: span 1;
    }

    .section-header,
    .toolbar,
    .button-row,
    .helper-row,
    .quick-bases {
        flex-direction: column;
        align-items: flex-start;
    }

    .toolbar .btn,
    .button-row .btn,
    .quick-bases .btn-xs,
    .swap-btn {
        width: 100%;
        max-width: none;
    }

    .multi-field {
        grid-template-columns: repeat(1, 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);
}

/* 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;
}