:root {
    --bg-primary: #f5f5f8;
    --bg-secondary: #ffffff;
    --bg-card: rgba(255, 255, 255, 0.85);
    --bg-card-solid: #ffffff;
    --bg-elevated: #f0f0f4;
    --bg-hover: rgba(0, 0, 0, 0.03);
    --bg-input: #ffffff;
    --border-color: rgba(0, 0, 0, 0.08);
    --border-focus: rgba(148, 40, 58, 0.45);
    --border-radius: 12px;
    --border-radius-sm: 8px;
    --border-radius-xs: 6px;
    --text-primary: #1a1a2e;
    --text-secondary: #64648a;
    --text-muted: #9e9eb8;
    --text-accent: #94283A;
    --accent-primary: #94283A;
    --accent-primary-hover: #7d2232;
    --accent-primary-light: #f9e8eb;
    --accent-green: #059669;
    --accent-green-dim: rgba(5, 150, 105, 0.08);
    --accent-cyan: #0891b2;
    --accent-cyan-dim: rgba(8, 145, 178, 0.08);
    --accent-orange: #d97706;
    --accent-orange-dim: rgba(217, 119, 6, 0.07);
    --accent-red: #dc2626;
    --accent-red-dim: rgba(220, 38, 38, 0.06);
    --accent-pink: #c026d3;
    --accent-pink-dim: rgba(192, 38, 211, 0.06);
    --accent-blue: #2563eb;
    --accent-gray: #6b7280;
    --success: #059669;
    --warning: #d97706;
    --danger: #dc2626;
    --info: #0891b2;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.07), 0 2px 4px rgba(0, 0, 0, 0.04);
    --shadow-lg: 0 10px 32px rgba(0, 0, 0, 0.1), 0 4px 8px rgba(0, 0, 0, 0.04);
    --shadow-glow: 0 0 16px rgba(148, 40, 58, 0.1);
    --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
    --space-xs: 4px;
    --space-sm: 8px;
    --space-md: 16px;
    --space-lg: 24px;
    --space-xl: 32px;
    --space-2xl: 48px;
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-normal: 250ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 400ms cubic-bezier(0.4, 0, 0.2, 1);
}
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}
html {
    font-size: 15px;
    scroll-behavior: smooth;
}
body {
    font-family: var(--font-body);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100svh; 
    display: flex;
    flex-direction: column;
    overflow-x: hidden;
    background-image:
        radial-gradient(ellipse at 20% 0%, rgba(148, 40, 58, 0.04) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 100%, rgba(5, 150, 105, 0.03) 0%, transparent 50%);
    position: relative;
    background-attachment: fixed; 
}
body::before {
    content: '';
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: clamp(300px, 60vmin, 600px); 
    height: clamp(300px, 60vmin, 600px);
    background: url('/static/img/TroyU-seal.png') no-repeat center center;
    background-size: contain;
    opacity: 0.03; 
    filter: grayscale(100%); 
    mix-blend-mode: multiply; 
    pointer-events: none;
    z-index: 50; 
}
::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}
::-webkit-scrollbar-track {
    background: transparent;
}
::-webkit-scrollbar-thumb {
    background: rgba(0, 0, 0, 0.12);
    border-radius: 3px;
}
::-webkit-scrollbar-thumb:hover {
    background: rgba(0, 0, 0, 0.22);
}
.app-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-md) var(--space-xl);
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 1px 4px rgba(0,0,0,0.04);
}
.header-left {
    display: flex;
    align-items: center;
    gap: var(--space-md);
}
.logo-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    filter: drop-shadow(0 2px 4px rgba(148, 40, 58, 0.2));
}
.app-title {
    font-size: 1.4rem;
    font-weight: 700;
    background: linear-gradient(135deg, #94283A, #c4485e);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.02em;
}
.app-subtitle {
    font-size: 0.75rem;
    color: var(--text-muted);
    font-weight: 400;
    letter-spacing: 0.05em;
    text-transform: uppercase;
}
.status-pill {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-xs) var(--space-md);
    background: var(--bg-elevated);
    border-radius: 20px;
    border: 1px solid var(--border-color);
    font-size: 0.8rem;
    color: var(--text-secondary);
}
.status-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--accent-green);
    box-shadow: 0 0 6px rgba(5, 150, 105, 0.4);
    animation: pulse-dot 2s infinite;
}
@keyframes pulse-dot {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.4; }
}
.tab-nav {
    display: flex;
    gap: var(--space-xs);
    padding: var(--space-sm) var(--space-xl);
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
}
.tab-btn {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-lg);
    border: none;
    background: transparent;
    color: var(--text-secondary);
    font-family: var(--font-body);
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    border-radius: var(--border-radius-sm);
    transition: all var(--transition-fast);
    position: relative;
}
.tab-btn:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}
.tab-btn.active {
    background: var(--accent-primary-light);
    color: var(--accent-primary);
    font-weight: 600;
}
.tab-btn.active::after {
    content: '';
    position: absolute;
    bottom: -9px;
    left: 50%;
    transform: translateX(-50%);
    width: 40%;
    height: 2px;
    background: var(--accent-primary);
    border-radius: 1px;
}
.tab-icon {
    font-size: 1.1rem;
}
.main-content {
    flex: 1;
    padding: var(--space-lg) var(--space-xl);
    padding-bottom: 60px; 
}
.tab-panel {
    display: none;
    animation: fadeIn var(--transition-normal) ease-out;
}
.tab-panel.active {
    display: block;
}
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(8px); }
    to { opacity: 1; transform: translateY(0); }
}
.card {
    border-radius: var(--border-radius);
    overflow: hidden;
}
.glass-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
    transition: box-shadow var(--transition-normal), border-color var(--transition-normal);
}
.glass-card:hover {
    box-shadow: var(--shadow-md);
    border-color: rgba(0, 0, 0, 0.12);
}
.card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-md) var(--space-lg);
    border-bottom: 1px solid var(--border-color);
    background: rgba(0, 0, 0, 0.015);
}
.card-header h2 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    letter-spacing: -0.01em;
}
.card-body {
    padding: var(--space-lg);
}
.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
    padding: var(--space-sm) var(--space-md);
    border: none;
    border-radius: var(--border-radius-xs);
    font-family: var(--font-body);
    font-size: 0.85rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
    white-space: nowrap;
}
.btn-primary {
    background: linear-gradient(135deg, #94283A, #7d2232);
    color: white;
    box-shadow: 0 2px 8px rgba(148, 40, 58, 0.25);
}
.btn-primary:hover {
    box-shadow: 0 4px 16px rgba(148, 40, 58, 0.35);
    transform: translateY(-1px);
}
.btn-secondary {
    background: var(--bg-elevated);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}
.btn-secondary:hover {
    background: var(--bg-hover);
    border-color: rgba(0, 0, 0, 0.15);
}
.btn-ghost {
    background: transparent;
    color: var(--text-secondary);
}
.btn-ghost:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}
.btn-danger {
    background: var(--accent-red-dim);
    color: var(--accent-red);
    border: 1px solid rgba(220, 38, 38, 0.15);
}
.btn-danger:hover {
    background: rgba(220, 38, 38, 0.12);
}
.btn-danger-outline {
    background: transparent;
    color: var(--accent-red);
    border: 1px solid rgba(220, 38, 38, 0.25);
}
.btn-danger-outline:hover {
    background: var(--accent-red-dim);
    border-color: rgba(220, 38, 38, 0.4);
}
.btn-icon {
    padding: var(--space-xs);
    width: 32px;
    height: 32px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--border-radius-xs);
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
    font-size: 0.95rem;
}
.btn-icon:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}
.btn-icon.danger:hover {
    background: var(--accent-red-dim);
    color: var(--accent-red);
}
.full-width {
    width: 100%;
    justify-content: center;
}
.hidden {
    display: none !important;
}
.form-group {
    margin-bottom: var(--space-md);
}
.form-group label {
    display: block;
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: var(--space-xs);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}
.form-group input,
.form-group select {
    width: 100%;
    padding: var(--space-sm) var(--space-md);
    background: var(--bg-input);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-xs);
    color: var(--text-primary);
    font-family: var(--font-body);
    font-size: 0.9rem;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
    outline: none;
}
.form-group input:focus,
.form-group select:focus {
    border-color: var(--border-focus);
    box-shadow: 0 0 0 3px rgba(148, 40, 58, 0.08);
}
.form-group input::placeholder {
    color: var(--text-muted);
}
.form-group.inline {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    margin-bottom: 0;
}
.form-group.inline label {
    margin-bottom: 0;
    white-space: nowrap;
}
.form-group.inline input,
.form-group.inline select {
    width: auto;
    min-width: 180px;
}
.form-group.compact {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    margin-bottom: 0;
}
.form-group.compact label {
    margin-bottom: 0;
    white-space: nowrap;
    font-size: 0.78rem;
}
.form-group.compact input {
    width: auto;
    min-width: 100px;
    padding: 6px 10px;
}
.form-group.compact input[type="number"] {
    min-width: 70px;
}
.btn-row {
    display: flex;
    gap: var(--space-sm);
    margin-bottom: var(--space-md);
    flex-wrap: wrap;
}
.btn-row .btn {
    flex: 1;
    justify-content: center;
    min-width: 0;
}
.live-preview {
    text-align: center;
    padding: var(--space-sm) 0;
    min-height: 32px;
}
.preview-text {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--accent-primary);
    transition: opacity var(--transition-fast);
}
.preview-text:empty {
    opacity: 0;
}
.gpa-layout {
    display: grid;
    grid-template-columns: 1fr 1.6fr;
    gap: var(--space-lg);
    align-items: start;
}
@media (max-width: 1200px) {
    .gpa-layout {
        grid-template-columns: 1fr;
    }
}
.courses-input-container {
    margin-top: var(--space-sm);
}
.courses-header {
    display: grid;
    grid-template-columns: 48px 1fr 100px 40px;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-sm);
    font-size: 0.78rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    border-bottom: 1px solid var(--border-color);
}
.courses-scroll {
    max-height: 320px;
    overflow-y: auto;
    padding: var(--space-sm) 0;
}
.course-row {
    display: grid;
    grid-template-columns: 48px 1fr 100px 40px;
    gap: var(--space-sm);
    padding: var(--space-xs) var(--space-sm);
    align-items: center;
    border-radius: var(--border-radius-xs);
    transition: background var(--transition-fast);
    animation: slideIn var(--transition-normal) ease-out;
}
@keyframes slideIn {
    from { opacity: 0; transform: translateX(-8px); }
    to { opacity: 1; transform: translateX(0); }
}
.course-row:hover {
    background: var(--bg-hover);
}
.course-row .stt {
    text-align: center;
    font-size: 0.85rem;
    color: var(--text-muted);
    font-weight: 500;
}
.course-row select,
.course-row input[type="number"] {
    padding: 6px 10px;
    background: var(--bg-input);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-xs);
    color: var(--text-primary);
    font-family: var(--font-body);
    font-size: 0.85rem;
    outline: none;
    transition: border-color var(--transition-fast);
}
.course-row select:focus,
.course-row input[type="number"]:focus {
    border-color: var(--border-focus);
}
.course-row select {
    width: 100%;
}
.course-row input[type="number"] {
    width: 100%;
}
.table-container {
    overflow-x: auto;
}
.data-table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0;
}
.data-table thead th {
    padding: var(--space-sm) var(--space-md);
    background: var(--bg-elevated);
    font-size: 0.78rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    text-align: center;
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 1;
}
.data-table tbody td {
    padding: var(--space-sm) var(--space-md);
    font-size: 0.9rem;
    text-align: center;
    border-bottom: 1px solid var(--border-color);
    transition: background var(--transition-fast);
}
.data-table tbody tr {
    transition: background var(--transition-fast);
}
.data-table tbody tr:hover {
    background: rgba(148, 40, 58, 0.03);
}
.gpa-value {
    font-weight: 600;
    font-variant-numeric: tabular-nums;
}
.gpa-high { color: var(--accent-green); }
.gpa-mid { color: var(--accent-orange); }
.gpa-low { color: var(--accent-red); }
.cum-gpa {
    font-weight: 700;
    color: var(--accent-primary);
}
.action-cell {
    display: flex;
    gap: var(--space-xs);
    justify-content: center;
}
.table-empty, .chart-empty {
    text-align: center;
    padding: var(--space-2xl);
    color: var(--text-muted);
    font-size: 0.95rem;
}
.empty-state {
    text-align: center;
    padding: var(--space-xl) !important;
    color: var(--text-muted) !important;
    font-style: italic;
}
.chart-card {
    max-width: 100%;
}
.chart-body {
    position: relative;
    min-height: 420px;
}
.chart-body canvas {
    width: 100% !important;
    height: 400px !important;
}
.tl-profile-card .card-body {
    padding: var(--space-md) var(--space-lg);
}
.tl-profile-row {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    flex-wrap: wrap;
}
.tl-course-input-row {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    flex-wrap: wrap;
    margin-bottom: var(--space-md);
}
.tl-courses-table-wrap {
    max-height: 220px;
    overflow-y: auto;
}
.tl-actions-row {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    flex-wrap: wrap;
}
.tl-summary {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-left: var(--space-md);
}
.tl-hint {
    font-size: 0.8rem;
    color: var(--text-muted);
    font-style: italic;
    margin-left: auto;
}
.tl-timeline-wrap {
    max-height: 550px;
    overflow-y: auto;
}
.timeline-table .row-header td {
    font-weight: 600;
    background: var(--bg-elevated);
    border-top: 2px solid var(--border-color);
}
.timeline-table .tag-midterm td {
    color: var(--accent-orange) !important;
    font-weight: 600;
}
.timeline-table .tag-midterm {
    background: var(--accent-orange-dim);
}
.timeline-table .tag-final td {
    color: var(--accent-red) !important;
    font-weight: 700;
}
.timeline-table .tag-final {
    background: var(--accent-red-dim);
}
.timeline-table .tag-break td {
    color: var(--accent-gray) !important;
}
.timeline-table .tag-break {
    background: rgba(107, 114, 128, 0.06);
}
.timeline-table .tag-course_break td {
    color: var(--accent-pink) !important;
    font-style: italic;
}
.timeline-table .tag-course_break {
    background: var(--accent-pink-dim);
}
.timeline-table .tag-online td {
    color: var(--accent-blue) !important;
    font-weight: 500;
}
.timeline-table .tag-online {
    background: rgba(37, 99, 235, 0.08); 
}
.timeline-table .tag-today_week {
    background: var(--accent-primary-light) !important;
}
.timeline-table .tag-today_week td {
    color: var(--accent-primary) !important;
}
.timeline-table .tag-rescheduled td {
    color: #0d9488 !important;
    font-weight: 600;
    font-style: italic;
}
.timeline-table .tag-rescheduled {
    background: rgba(13, 148, 136, 0.08);
}
.tl-dropdown {
    position: relative;
    display: inline-block;
}
.tl-dropdown-btn {
    padding: 4px 8px;
    background: transparent;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-xs);
    color: var(--text-secondary);
    cursor: pointer;
    font-size: 0.8rem;
    transition: all var(--transition-fast);
}
.tl-dropdown-btn:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}
.tl-dropdown-menu {
    display: none;
    position: absolute;
    right: 0;
    top: 100%;
    min-width: 260px;
    background: var(--bg-card-solid);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    box-shadow: var(--shadow-lg);
    z-index: 200;
    padding: var(--space-xs) 0;
    animation: fadeIn var(--transition-fast) ease-out;
}
.tl-dropdown-menu.open {
    display: block;
}
.tl-dropdown-item {
    display: block;
    width: 100%;
    padding: var(--space-sm) var(--space-md);
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-family: var(--font-body);
    font-size: 0.82rem;
    text-align: left;
    cursor: pointer;
    transition: background var(--transition-fast);
}
.tl-dropdown-item:hover {
    background: var(--bg-hover);
}
.tl-dropdown-sep {
    height: 1px;
    background: var(--border-color);
    margin: var(--space-xs) 0;
}
.tl-chip-bar {
    display: inline-flex;
    align-items: center;
    gap: 3px;
}
.tl-chip-btn {
    width: 30px;
    height: 28px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-xs);
    background: var(--bg-secondary);
    color: var(--text-secondary);
    cursor: pointer;
    font-size: 0.82rem;
    transition: all var(--transition-fast);
    position: relative;
}
.tl-chip-btn:hover {
    background: var(--accent-primary-light);
    border-color: rgba(148, 40, 58, 0.25);
    color: var(--accent-primary);
    transform: translateY(-1px);
    box-shadow: 0 2px 6px rgba(148, 40, 58, 0.12);
    z-index: 100;
}
.tl-chip-btn:active {
    transform: translateY(0);
}
.tl-chip-btn.active {
    background: var(--accent-primary);
    color: white;
    border-color: var(--accent-primary);
    box-shadow: 0 2px 8px rgba(148, 40, 58, 0.3);
}
.tl-chip-btn[data-tooltip]::after {
    content: attr(data-tooltip);
    position: absolute;
    bottom: calc(100% + 6px);
    left: 50%;
    transform: translateX(-50%);
    padding: 3px 8px;
    background: var(--text-primary);
    color: white;
    font-size: 0.7rem;
    font-weight: 500;
    border-radius: 4px;
    white-space: nowrap;
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-fast);
    z-index: 10;
}
.tl-chip-btn:hover[data-tooltip]::after {
    opacity: 1;
}
.tl-reschedule-panel-row td {
    padding: 0 !important;
    border-bottom: 2px solid rgba(13, 148, 136, 0.2);
}
.tl-reschedule-panel {
    background: linear-gradient(135deg, rgba(13, 148, 136, 0.04), rgba(13, 148, 136, 0.01));
    border-left: 3px solid #0d9488;
    padding: var(--space-md) var(--space-lg);
    animation: panelSlideIn 300ms cubic-bezier(0.34, 1.56, 0.64, 1);
    transform-origin: top;
}
@keyframes panelSlideIn {
    from {
        opacity: 0;
        transform: scaleY(0.8) translateY(-8px);
        max-height: 0;
    }
    to {
        opacity: 1;
        transform: scaleY(1) translateY(0);
        max-height: 400px;
    }
}
.tl-reschedule-panel-closing {
    animation: panelSlideOut 200ms ease-in forwards;
}
@keyframes panelSlideOut {
    from {
        opacity: 1;
        transform: scaleY(1);
        max-height: 400px;
    }
    to {
        opacity: 0;
        transform: scaleY(0.8);
        max-height: 0;
    }
}
.tl-rp-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--space-md);
}
.tl-rp-title {
    font-size: 0.92rem;
    font-weight: 600;
    color: #0d9488;
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}
.tl-rp-close {
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: none;
    background: transparent;
    color: var(--text-muted);
    cursor: pointer;
    border-radius: 50%;
    font-size: 1.1rem;
    transition: all var(--transition-fast);
}
.tl-rp-close:hover {
    background: rgba(0, 0, 0, 0.06);
    color: var(--text-primary);
}
.tl-rp-original {
    font-size: 0.84rem;
    color: var(--text-secondary);
    margin-bottom: var(--space-md);
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}
.tl-rp-original strong {
    color: var(--text-primary);
    font-weight: 600;
}
.tl-rp-section-label {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-size: 0.78rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.06em;
    margin-bottom: var(--space-sm);
}
.tl-rp-section-label .icon {
    font-size: 0.85rem;
}
.tl-suggestion-chips {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm);
    margin-bottom: var(--space-md);
}
.tl-suggestion-chip {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: var(--space-sm) var(--space-md);
    min-width: 72px;
    border: 1.5px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    background: var(--bg-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
    position: relative;
}
.tl-suggestion-chip:hover {
    border-color: #0d9488;
    background: rgba(13, 148, 136, 0.06);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(13, 148, 136, 0.15);
}
.tl-suggestion-chip.selected {
    border-color: #0d9488;
    background: rgba(13, 148, 136, 0.1);
    box-shadow: 0 0 0 3px rgba(13, 148, 136, 0.15), 0 4px 12px rgba(13, 148, 136, 0.15);
}
.tl-suggestion-chip.has-conflict {
    border-color: rgba(217, 119, 6, 0.3);
    opacity: 0.75;
}
.tl-suggestion-chip.has-conflict:hover {
    opacity: 1;
    border-color: var(--accent-orange);
    background: var(--accent-orange-dim);
}
.tl-chip-weekday {
    font-size: 0.72rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.04em;
}
.tl-chip-date {
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-top: 1px;
}
.tl-chip-conflict-dot {
    position: absolute;
    top: -3px;
    right: -3px;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--accent-orange);
    border: 1.5px solid var(--bg-secondary);
}
.tl-conflict-warning {
    display: flex;
    align-items: flex-start;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-md);
    background: var(--accent-orange-dim);
    border: 1px solid rgba(217, 119, 6, 0.2);
    border-radius: var(--border-radius-xs);
    font-size: 0.82rem;
    color: var(--accent-orange);
    margin-bottom: var(--space-md);
    animation: fadeIn var(--transition-fast);
    line-height: 1.5;
}
.tl-conflict-warning .icon {
    font-size: 0.95rem;
    flex-shrink: 0;
    margin-top: 1px;
}
.tl-rp-divider {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    margin-bottom: var(--space-md);
    color: var(--text-muted);
    font-size: 0.78rem;
}
.tl-rp-divider::before,
.tl-rp-divider::after {
    content: '';
    flex: 1;
    height: 1px;
    background: var(--border-color);
}
.tl-rp-actions {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    margin-top: var(--space-md);
}
.tl-rp-actions .btn {
    min-width: 110px;
    justify-content: center;
}
.tl-rp-custom-date {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    margin-bottom: 0;
}
.tl-rp-custom-date input[type="date"] {
    padding: 6px 10px;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-xs);
    font-family: var(--font-body);
    font-size: 0.85rem;
    color: var(--text-primary);
    background: var(--bg-input);
    outline: none;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}
.tl-rp-custom-date input[type="date"]:focus {
    border-color: var(--border-focus);
    box-shadow: 0 0 0 3px rgba(148, 40, 58, 0.08);
}
.tl-rp-custom-date .btn-secondary {
    font-size: 0.82rem;
    padding: 6px 12px;
}
.toast.has-undo {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-md);
    min-width: 350px;
}
.toast-undo-btn {
    padding: 4px 12px;
    background: transparent;
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: var(--border-radius-xs);
    color: inherit;
    font-family: var(--font-body);
    font-size: 0.8rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    white-space: nowrap;
    flex-shrink: 0;
}
.toast.success .toast-undo-btn {
    border-color: rgba(5, 150, 105, 0.3);
    color: var(--accent-green);
}
.toast.success .toast-undo-btn:hover {
    background: rgba(5, 150, 105, 0.1);
    border-color: var(--accent-green);
}
.toast-progress {
    position: absolute;
    bottom: 0;
    left: 0;
    height: 2px;
    background: var(--accent-green);
    border-radius: 0 0 0 var(--border-radius-sm);
    animation: toastProgress 5s linear forwards;
}
@keyframes toastProgress {
    from { width: 100%; }
    to { width: 0%; }
}
.status-bar {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    padding: var(--space-sm) var(--space-xl);
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    font-size: 0.82rem;
    color: var(--text-secondary);
    text-align: center;
    z-index: 100;
    box-shadow: 0 -1px 4px rgba(0,0,0,0.03);
}
.toast-container {
    position: fixed;
    top: var(--space-lg);
    right: var(--space-lg);
    z-index: 1000;
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}
.toast {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-lg);
    background: var(--bg-card-solid);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    box-shadow: var(--shadow-lg);
    font-size: 0.85rem;
    color: var(--text-primary);
    min-width: 280px;
    animation: slideInRight var(--transition-normal) ease-out;
    transition: opacity var(--transition-normal), transform var(--transition-normal);
}
@keyframes slideInRight {
    from { opacity: 0; transform: translateX(100px); }
    to { opacity: 1; transform: translateX(0); }
}
.toast.hiding {
    opacity: 0;
    transform: translateX(100px);
}
.toast.success { border-left: 3px solid var(--success); }
.toast.error { border-left: 3px solid var(--danger); }
.toast.info { border-left: 3px solid var(--info); }
.toast.warning { border-left: 3px solid var(--warning); }
.toast-icon {
    font-size: 1.1rem;
}
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.35);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 500;
    backdrop-filter: blur(4px);
    animation: fadeIn var(--transition-fast);
}
.modal-card {
    padding: var(--space-xl);
    max-width: 420px;
    width: 90%;
    text-align: center;
}
.modal-message {
    font-size: 0.95rem;
    margin-bottom: var(--space-lg);
    line-height: 1.6;
}
.modal-buttons {
    display: flex;
    gap: var(--space-sm);
    justify-content: center;
}
.data-table.compact tbody td {
    padding: 6px var(--space-sm);
    font-size: 0.85rem;
}
.data-table.compact thead th {
    padding: 6px var(--space-sm);
    font-size: 0.72rem;
}
.btn,
.btn-icon,
.tab-btn,
.tl-dropdown-btn {
    touch-action: manipulation;
}
.btn:active,
.btn-icon:active,
.tab-btn:active,
.tl-dropdown-btn:active {
    transform: scale(0.96);
}
.btn:focus-visible,
.btn-icon:focus-visible,
.tab-btn:focus-visible,
.form-group input:focus-visible,
.form-group select:focus-visible {
    outline: 2px solid var(--accent-primary);
    outline-offset: 2px;
}
.table-container {
    -webkit-overflow-scrolling: touch;
    position: relative;
}
.table-container::after {
    content: '';
    position: sticky;
    right: 0;
    top: 0;
    bottom: 0;
    width: 24px;
    background: linear-gradient(to left, var(--bg-card), transparent);
    pointer-events: none;
    z-index: 2;
    display: none; 
}
@media (max-width: 1024px) {
    .main-content {
        padding: var(--space-md) var(--space-lg);
        padding-bottom: 52px;
    }
    .card-body {
        padding: var(--space-md);
    }
    .card-header {
        padding: var(--space-sm) var(--space-md);
    }
    .tl-actions-row {
        gap: var(--space-sm);
    }
    .tl-summary {
        margin-left: 0;
    }
    .tl-hint {
        width: 100%;
        margin-left: 0;
        margin-top: var(--space-xs);
    }
    .chart-body {
        min-height: 360px;
    }
    .chart-body canvas {
        height: 340px !important;
    }
}
@media (max-width: 768px) {
    html {
        font-size: 14px;
    }
    .app-header {
        padding: var(--space-sm) var(--space-md);
        padding-top: calc(var(--space-sm) + env(safe-area-inset-top, 0px));
    }
    .logo-icon img {
        width: 28px !important;
        height: 24px !important;
    }
    .app-title {
        font-size: 1.15rem;
    }
    .app-subtitle {
        display: none;
    }
    .status-pill {
        padding: 3px 10px;
        font-size: 0.72rem;
    }
    .status-dot {
        width: 6px;
        height: 6px;
    }
    .tab-nav {
        padding: 0 var(--space-sm);
        gap: 0;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
        scrollbar-width: none; 
    }
    .tab-nav::-webkit-scrollbar {
        display: none; 
    }
    .tab-btn {
        flex: 1;
        justify-content: center;
        padding: var(--space-sm) var(--space-sm);
        font-size: 0.82rem;
        min-height: 44px;
        gap: var(--space-xs);
        border-radius: 0;
        position: relative;
    }
    .tab-btn.active::after {
        bottom: 0;
        width: 60%;
        height: 3px;
        border-radius: 3px 3px 0 0;
    }
    .tab-label {
        display: none;
    }
    .tab-icon {
        font-size: 1.2rem;
    }
    .main-content {
        padding: var(--space-sm);
        padding-bottom: 48px;
    }
    .card {
        border-radius: var(--border-radius-sm);
    }
    .glass-card {
        border-left: none;
        border-right: none;
        border-radius: var(--border-radius-sm);
    }
    .card-header {
        padding: var(--space-sm) var(--space-md);
        flex-wrap: wrap;
        gap: var(--space-sm);
    }
    .card-header h2 {
        font-size: 0.92rem;
    }
    .card-body {
        padding: var(--space-md) var(--space-sm);
    }
    .gpa-layout {
        grid-template-columns: 1fr;
        gap: var(--space-md);
    }
    .btn-row {
        flex-direction: column;
        gap: var(--space-xs);
    }
    .btn-row .btn {
        min-height: 44px;
        font-size: 0.88rem;
    }
    .btn.btn-danger.full-width {
        min-height: 44px;
    }
    .btn {
        min-height: 40px;
        padding: var(--space-sm) var(--space-md);
    }
    .btn-icon {
        width: 40px;
        height: 40px;
        font-size: 1rem;
    }
    .courses-header {
        grid-template-columns: 36px 1fr 72px 36px;
        gap: var(--space-xs);
        padding: var(--space-xs);
        font-size: 0.7rem;
    }
    .course-row {
        grid-template-columns: 36px 1fr 72px 36px;
        gap: var(--space-xs);
        padding: var(--space-xs);
    }
    .course-row select,
    .course-row input[type="number"] {
        padding: 6px 8px;
        font-size: 0.82rem;
    }
    .courses-scroll {
        max-height: 260px;
    }
    .form-group label {
        font-size: 0.75rem;
    }
    .form-group input,
    .form-group select {
        padding: 10px var(--space-md);
        font-size: 0.88rem;
        min-height: 42px;
    }
    .form-group.inline,
    .form-group.compact {
        flex-direction: column;
        align-items: stretch;
    }
    .form-group.inline input,
    .form-group.inline select {
        width: 100%;
        min-width: unset;
    }
    .form-group.compact input {
        width: 100%;
        min-width: unset;
        padding: 8px 10px;
        min-height: 40px;
    }
    .form-group.compact input[type="number"] {
        min-width: unset;
    }
    .live-preview {
        padding: var(--space-xs) 0;
    }
    .preview-text {
        font-size: 0.8rem;
    }
    .data-table thead th {
        padding: var(--space-xs) var(--space-sm);
        font-size: 0.68rem;
        letter-spacing: 0.03em;
    }
    .data-table tbody td {
        padding: var(--space-xs) var(--space-sm);
        font-size: 0.82rem;
    }
    .data-table.compact tbody td {
        padding: 5px var(--space-xs);
        font-size: 0.78rem;
    }
    .data-table.compact thead th {
        padding: 5px var(--space-xs);
        font-size: 0.66rem;
    }
    .table-container::after {
        display: block;
    }
    .tl-profile-card .card-body {
        padding: var(--space-sm) var(--space-md);
    }
    .tl-profile-row {
        flex-direction: column;
        align-items: stretch;
        gap: var(--space-sm);
    }
    .tl-profile-row .btn {
        width: 100%;
        justify-content: center;
        min-height: 44px;
    }
    .tl-course-input-row {
        flex-direction: column;
        align-items: stretch;
        gap: var(--space-sm);
    }
    .tl-course-input-row .btn {
        width: 100%;
        justify-content: center;
        min-height: 44px;
    }
    .tl-actions-row {
        width: 100%;
        flex-direction: column;
        align-items: stretch;
        gap: var(--space-sm);
    }
    .tl-actions-row .btn {
        width: 100%;
        justify-content: center;
        min-height: 44px;
    }
    .tl-summary {
        margin-left: 0;
        text-align: center;
    }
    .tl-hint {
        margin-left: 0;
        text-align: center;
        width: 100%;
    }
    .tl-timeline-wrap {
        max-height: 400px;
    }
    .tl-courses-table-wrap {
        max-height: 180px;
    }
    .tl-dropdown-menu {
        min-width: 220px;
        right: 0;
        left: auto;
        transform: none;
    }
    .tl-dropdown-item {
        font-size: 0.78rem;
        padding: 10px var(--space-md);
        min-height: 40px;
        display: flex;
        align-items: center;
    }
    .chart-body {
        min-height: 280px;
    }
    .chart-body canvas {
        height: 260px !important;
    }
    .status-bar {
        padding: var(--space-xs) var(--space-md);
        padding-bottom: calc(var(--space-xs) + env(safe-area-inset-bottom, 0px));
        font-size: 0.75rem;
    }
    .toast-container {
        top: auto;
        bottom: 48px; 
        bottom: calc(48px + env(safe-area-inset-bottom, 0px));
        right: var(--space-sm);
        left: var(--space-sm);
        align-items: stretch;
    }
    .toast {
        min-width: unset;
        width: 100%;
        font-size: 0.82rem;
        padding: var(--space-sm) var(--space-md);
        animation: slideInUp var(--transition-normal) ease-out;
    }
    .toast.hiding {
        opacity: 0;
        transform: translateY(40px);
    }
    .modal-card {
        max-width: 92%;
        width: 92%;
        padding: var(--space-lg);
    }
    .modal-message {
        font-size: 0.9rem;
    }
    .modal-buttons {
        flex-direction: column;
        gap: var(--space-xs);
    }
    .modal-buttons .btn {
        width: 100%;
        min-height: 44px;
        justify-content: center;
    }
    .action-cell {
        gap: 2px;
    }
    .table-empty, .chart-empty {
        padding: var(--space-xl);
        font-size: 0.88rem;
    }
}
@media (max-width: 480px) {
    html {
        font-size: 13.5px;
    }
    .app-header {
        gap: var(--space-sm);
    }
    .header-left {
        gap: var(--space-sm);
    }
    .app-title {
        font-size: 1.05rem;
    }
    .status-pill {
        padding: 2px 8px;
        font-size: 0.68rem;
        gap: var(--space-xs);
    }
    .main-content {
        padding: var(--space-xs);
        padding-bottom: 44px;
    }
    .card-body {
        padding: var(--space-sm);
    }
    .card-header {
        padding: var(--space-xs) var(--space-sm);
    }
    .card-header h2 {
        font-size: 0.85rem;
    }
    .courses-header,
    .course-row {
        grid-template-columns: 28px 1fr 64px 32px;
        gap: 3px;
    }
    .course-row .stt {
        font-size: 0.78rem;
    }
    .course-row select,
    .course-row input[type="number"] {
        padding: 5px 6px;
        font-size: 0.78rem;
    }
    .btn-row .btn {
        font-size: 0.82rem;
    }
    .data-table thead th {
        padding: 4px 5px;
        font-size: 0.64rem;
    }
    .data-table tbody td {
        padding: 5px 5px;
        font-size: 0.78rem;
    }
    .tl-dropdown-menu {
        min-width: 200px;
        right: 0;
        left: auto;
        transform: none;
    }
    .tl-dropdown-item {
        font-size: 0.74rem;
        padding: 8px var(--space-sm);
    }
    .chart-body {
        min-height: 240px;
    }
    .chart-body canvas {
        height: 220px !important;
    }
    .modal-card {
        max-width: 96%;
        width: 96%;
        padding: var(--space-md);
    }
    .status-bar {
        font-size: 0.7rem;
        padding: 4px var(--space-sm);
        padding-bottom: calc(4px + env(safe-area-inset-bottom, 0px));
    }
    .toast {
        font-size: 0.78rem;
        padding: var(--space-xs) var(--space-sm);
    }
}
@keyframes slideInUp {
    from { opacity: 0; transform: translateY(40px); }
    to { opacity: 1; transform: translateY(0); }
}
@media (max-height: 500px) and (orientation: landscape) {
    .app-header {
        padding: 4px var(--space-md);
    }
    .app-title {
        font-size: 1rem;
    }
    .tab-btn {
        min-height: 36px;
        padding: 4px var(--space-sm);
    }
    .main-content {
        padding-bottom: 36px;
    }
    .status-bar {
        padding: 3px var(--space-md);
    }
    .courses-scroll {
        max-height: 160px;
    }
    .tl-timeline-wrap {
        max-height: 250px;
    }
    .chart-body {
        min-height: 200px;
    }
    .chart-body canvas {
        height: 180px !important;
    }
}
@media print {
    .app-header,
    .tab-nav,
    .status-bar,
    .toast-container,
    .modal-overlay,
    .btn-row,
    .btn-cancel-edit,
    .action-cell,
    .tl-actions-row .btn,
    .tl-dropdown {
        display: none !important;
    }
    .main-content {
        padding: 0;
    }
    .glass-card {
        box-shadow: none;
        border: 1px solid #ccc;
    }
    .tab-panel {
        display: block !important;
    }
}