:root {
    --gc-page-bg: var(--hero-bg-start);
    --gc-card-bg: var(--bg-primary);
    --gc-card-border: #dfe4ff;
    --gc-text-primary: #172046;
    --gc-text-secondary: #505b87;
    --gc-muted: #7783a7;
    --gc-accent: #3a56ff;
    --gc-accent-strong: #2b40d4;
    --gc-success: #1f8a5f;
    --gc-warning: #f0a202;
    --gc-danger: #d7434e;
    --gc-focus: rgba(58, 86, 255, 0.3);
    --gc-soft-surface: var(--color-indigo-soft);
    --gc-soft-surface-alt: #e4ecff;
    --gc-shadow-soft: 0 12px 32px rgba(23, 32, 70, 0.08);
}

[data-theme="dark"] {
    --gc-page-bg: #0f172a;
    --gc-card-border: #374151;
    --gc-text-primary: #f8fafc;
    --gc-text-secondary: #cbd5e1;
    --gc-muted: #94a3b8;
    --gc-accent: #60a5fa;
    --gc-accent-strong: #3b82f6;
    --gc-danger: #f87171;
    --gc-soft-surface-alt: #1e293b;
}

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

.tool-hero {
    background: linear-gradient(120deg, rgba(58, 86, 255, 0.16), rgba(149, 170, 255, 0.2));
    padding: 4.5rem 0 3.5rem;
}

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

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

.tool-title {
    font-size: clamp(2.1rem, 4vw, 2.9rem);
    color: var(--gc-text-primary);
    margin-bottom: 0.75rem;
}

.tool-description {
    font-size: 1.05rem;
    color: var(--gc-text-secondary);
    margin-bottom: 1.5rem;
}

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

.meta-pill {
    background: rgba(58, 86, 255, 0.12);
    color: var(--gc-accent-strong);
    padding: 0.5rem 1.05rem;
    border-radius: 999px;
    font-weight: 600;
    font-size: 0.9rem;
    letter-spacing: 0.02em;
}

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

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

.tool-card {
    background: var(--gc-card-bg);
    border: 1px solid var(--gc-card-border);
    border-radius: 1.25rem;
    box-shadow: var(--gc-shadow-soft);
    padding: 1.75rem;
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

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

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

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

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

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

.btn {
    border: 0;
    border-radius: 0.85rem;
    font-weight: 600;
    font-size: 0.95rem;
    padding: 0.8rem 1.35rem;
    cursor: pointer;
    transition: transform 0.15s ease, box-shadow 0.15s ease, background-color 0.15s ease;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

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

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

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

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

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

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

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

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

.semester-actions {
    display: flex;
    align-items: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.semester-container {
    display: grid;
    gap: 1.25rem;
}

.semester-card {
    border: 1px solid rgba(58, 86, 255, 0.18);
    border-radius: 1rem;
    padding: 1.25rem;
    background: var(--gc-soft-surface);
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

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

.semester-title {
    font-weight: 700;
    color: var(--gc-text-primary);
    font-size: 1.05rem;
}

.semester-controls {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.semester-controls .btn-sm {
    padding: 0.4rem 0.75rem;
    font-size: 0.82rem;
    border-radius: 0.65rem;
}

.course-table {
    width: 100%;
    border-collapse: collapse;
    background: var(--bg-primary);
    border-radius: 0.85rem;
    overflow: hidden;
    border: 1px solid rgba(58, 86, 255, 0.14);
}

.course-table thead {
    background: var(--gc-soft-surface-alt);
}

.course-table th,
.course-table td {
    padding: 0.85rem;
    text-align: left;
    font-size: 0.92rem;
    color: var(--gc-text-secondary);
}

.course-table th {
    font-weight: 700;
    color: var(--gc-text-primary);
}

.course-table tbody tr + tr {
    border-top: 1px solid rgba(58, 86, 255, 0.08);
}

.course-input {
    width: 100%;
    border: 1px solid var(--gc-card-border);
    border-radius: 0.7rem;
    padding: 0.65rem 0.75rem;
    font-size: 0.92rem;
    background: var(--bg-primary);
    color: var(--gc-text-primary);
}

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

.grade-select {
    width: 100%;
    border: 1px solid var(--gc-card-border);
    border-radius: 0.7rem;
    padding: 0.6rem 0.75rem;
    font-size: 0.92rem;
    background: var(--bg-primary);
    color: var(--gc-text-primary);
}

.grade-select:focus {
    outline: none;
    border-color: var(--gc-accent);
    box-shadow: 0 0 0 4px var(--gc-focus);
}

.remove-course-btn {
    background: transparent;
    border: 1px solid rgba(215, 67, 78, 0.35);
    color: var(--gc-danger);
    padding: 0.45rem 0.75rem;
    border-radius: 0.65rem;
    font-size: 0.82rem;
    cursor: pointer;
    transition: background 0.15s ease, color 0.15s ease;
}

.remove-course-btn:hover {
    background: rgba(215, 67, 78, 0.1);
}

.empty-placeholder {
    background: rgba(58, 86, 255, 0.08);
    border: 1px dashed rgba(58, 86, 255, 0.3);
    border-radius: 0.85rem;
    padding: 1rem;
    text-align: center;
    font-size: 0.9rem;
    color: var(--gc-muted);
}

.summary-stats {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.summary-card {
    background: var(--gc-soft-surface);
    border: 1px solid rgba(58, 86, 255, 0.14);
    border-radius: 1rem;
    padding: 1rem 1.25rem;
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
}

.summary-card.primary {
    background: linear-gradient(135deg, rgba(58, 86, 255, 0.16), rgba(58, 86, 255, 0.05));
    border-color: rgba(58, 86, 255, 0.4);
}

.summary-label {
    font-size: 0.82rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--gc-muted);
}

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

.summary-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 0.85rem;
}

.notification {
    background: rgba(58, 86, 255, 0.12);
    color: var(--gc-text-primary);
    border-radius: 0.85rem;
    padding: 0.85rem 1rem;
    font-size: 0.9rem;
    border: 1px solid rgba(58, 86, 255, 0.18);
}

.notification.success {
    background: rgba(31, 138, 95, 0.12);
    border-color: rgba(31, 138, 95, 0.25);
    color: var(--text-success);
}

.notification.warn {
    background: rgba(240, 162, 2, 0.12);
    border-color: rgba(240, 162, 2, 0.28);
    color: var(--color-yellow);
}

.notification.error {
    background: rgba(215, 67, 78, 0.15);
    border-color: rgba(215, 67, 78, 0.35);
    color: var(--gc-danger);
}

.notification.hidden {
    display: none;
}

.semester-summary-list {
    display: grid;
    gap: 0.6rem;
}

.semester-pill {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: rgba(58, 86, 255, 0.1);
    border-radius: 0.75rem;
    padding: 0.6rem 0.85rem;
    font-size: 0.9rem;
    color: var(--gc-text-primary);
}

.semester-pill strong {
    font-weight: 700;
}

.table-wrapper {
    border: 1px solid rgba(58, 86, 255, 0.14);
    border-radius: 1rem;
    background: var(--bg-primary);
    overflow: auto;
}

.breakdown-table {
    width: 100%;
    border-collapse: collapse;
    min-width: 680px;
}

.breakdown-table th,
.breakdown-table td {
    padding: 0.85rem 1rem;
    text-align: left;
    border-bottom: 1px solid rgba(58, 86, 255, 0.1);
    font-size: 0.92rem;
    color: var(--gc-text-secondary);
}

.breakdown-table th {
    background: var(--gc-soft-surface-alt);
    color: var(--gc-text-primary);
    font-weight: 700;
}

.breakdown-table tr:last-child td {
    border-bottom: none;
}

.breakdown-table .empty-row td {
    text-align: center;
    color: var(--gc-muted);
    font-style: italic;
}

.info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 1.5rem;
}

.info-block {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    background: var(--bg-primary);
    border-radius: 1rem;
    border: 1px solid rgba(58, 86, 255, 0.14);
    padding: 1.25rem;
}

.grade-scale {
    width: 100%;
    border-collapse: collapse;
    border: 1px solid rgba(58, 86, 255, 0.18);
    border-radius: 0.75rem;
    overflow: hidden;
}

.grade-scale th,
.grade-scale td {
    padding: 0.65rem;
    text-align: center;
    font-size: 0.9rem;
    color: var(--gc-text-secondary);
}

.grade-scale th {
    background: var(--gc-soft-surface-alt);
    color: var(--gc-text-primary);
    font-weight: 700;
}

.tips-list {
    display: grid;
    gap: 0.75rem;
    padding-left: 1.1rem;
    color: var(--gc-text-secondary);
}

.tips-list li {
    line-height: 1.6;
}

.hidden {
    display: none !important;
}

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

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

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

@media (max-width: 1100px) {
    .span-7,
    .span-5 {
        grid-column: span 12;
    }
}

@media (max-width: 768px) {
    .tool-card {
        padding: 1.4rem;
    }

    .btn {
        width: 100%;
    }

    .semester-controls {
        width: 100%;
        justify-content: flex-start;
    }
}

/* 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;
}