@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=JetBrains+Mono:wght@400;500&display=swap');

:root {
    --bg:          #0f1117;
    --surface:     #161a23;
    --surface-2:   #1c2030;
    --surface-3:   #222840;
    --glass:       rgba(22, 26, 35, 0.85);

    --border:      #252d40;
    --border-2:    #2e3850;

    --accent:      #6b8cff;
    --accent-dim:  #5577ee;
    --accent-glow: rgba(107, 140, 255, 0.10);
    --accent-glow2:rgba(107, 140, 255, 0.04);

    --text:        #cdd5e0;
    --text-2:      #7a86a0;
    --text-3:      #404d66;

    --success:     #4ade9a;
    --danger:      #e05570;
    --danger-dim:  #b83a55;
    --warn:        #e0963a;

    --font-ui:     'Inter', sans-serif;
    --font-body:   'Inter', sans-serif;
    --font-mono:   'JetBrains Mono', monospace;

    --ease-out:    cubic-bezier(0.16, 1, 0.3, 1);
    --ease-in:     cubic-bezier(0.4, 0, 1, 1);
    --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);

    --sidebar-w:   268px;
    --topbar-h:    52px;
    --radius:      10px;
    --radius-sm:   6px;
    --radius-lg:   16px;
}

body.light {
    --bg:          #f5f6fa;
    --surface:     #ffffff;
    --surface-2:   #f0f1f7;
    --surface-3:   #e8eaf2;
    --glass:       rgba(255, 255, 255, 0.85);

    --border:      #e2e4ed;
    --border-2:    #d0d3e0;

    --accent:      #4f6ef7;
    --accent-dim:  #3d5ce0;
    --accent-glow: rgba(79, 110, 247, 0.10);
    --accent-glow2:rgba(79, 110, 247, 0.05);

    --text:        #1a1d2e;
    --text-2:      #4a5070;
    --text-3:      #9098b5;

    --success:     #18a870;
    --danger:      #e03060;
    --danger-dim:  #b82050;
    --warn:        #d08020;

    background-image: radial-gradient(circle, rgba(0,0,0,0.06) 1px, transparent 1px);
}

body.light::before {
    background:
        radial-gradient(ellipse 70% 50% at 15% 10%, rgba(79,110,247,0.04) 0%, transparent 60%),
        radial-gradient(ellipse 50% 60% at 85% 90%, rgba(79,110,247,0.03) 0%, transparent 60%);
}

body.light ::-webkit-scrollbar-thumb { background: var(--border-2); }

body.light input[type="date"].form-input { color-scheme: light; }

*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html, body {
    height: 100%;
    width: 100%;
    overflow: hidden;
}

body {
    font-family: var(--font-body);
    background: var(--bg);
    color: var(--text);
    display: flex;
    line-height: 1.5;
    background-image: radial-gradient(circle, rgba(255,255,255,0.025) 1px, transparent 1px);
    background-size: 32px 32px;
    background-position: 16px 16px;
}

body::before {
    content: '';
    position: fixed;
    inset: 0;
    background: 
        radial-gradient(ellipse 70% 50% at 15% 10%, rgba(107,140,255,0.04) 0%, transparent 60%),
        radial-gradient(ellipse 50% 60% at 85% 90%, rgba(107,140,255,0.03) 0%, transparent 60%);
    pointer-events: none;
    z-index: 0;
}

::-webkit-scrollbar { width: 4px; height: 4px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border-2); border-radius: 2px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-3); }

.sidebar {
    position: relative;
    z-index: 10;
    width: var(--sidebar-w);
    background: var(--surface);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
    transition: margin-left 0.4s var(--ease-out);
    overflow: visible;
}

.sidebar::after {
    content: '';
    position: absolute;
    right: -1px;
    top: 30%;
    bottom: 30%;
    width: 1px;
    background: linear-gradient(to bottom, transparent, var(--accent), transparent);
    opacity: 0.4;
}

.sidebar.collapsed {
    margin-left: calc(-1 * var(--sidebar-w));
}

.sidebar-header {
    height: var(--topbar-h);
    padding: 0 16px;
    display: flex;
    align-items: center;
    gap: 10px;
    border-bottom: 1px solid var(--border);
    position: relative;
}

.logo {
    width: 30px;
    height: 30px;
    background: var(--surface-3);
    border: 1px solid var(--border-2);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
    flex-shrink: 0;
}

.logo::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, var(--accent-glow) 0%, transparent 100%);
}

.logo-m {
    font-family: var(--font-ui);
    font-size: 11px;
    font-weight: 800;
    color: var(--accent);
    letter-spacing: -1px;
    line-height: 1;
    position: relative;
}

.logo-j {
    font-family: var(--font-ui);
    font-size: 11px;
    font-weight: 800;
    color: var(--text-2);
    line-height: 1;
    position: relative;
    margin-left: -1px;
}

.sidebar-title {
    font-family: var(--font-ui);
    font-size: 14px;
    font-weight: 600;
    letter-spacing: -0.2px;
    display: flex;
    gap: 3px;
}

.brand-name {
    color: var(--text);
    font-weight: 500;
}

.brand-name { color: var(--text); }
.brand-accent { color: var(--accent); }

.sidebar-pulse {
    margin-left: auto;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--success);
    box-shadow: 0 0 0 0 rgba(34, 211, 160, 0.5);
    animation: pulse-ring 2.5s ease-out infinite;
}

@keyframes pulse-ring {
    0%   { box-shadow: 0 0 0 0 rgba(34, 211, 160, 0.5); }
    60%  { box-shadow: 0 0 0 6px rgba(34, 211, 160, 0); }
    100% { box-shadow: 0 0 0 0 rgba(34, 211, 160, 0); }
}

.sidebar-search {
    padding: 10px 12px;
    border-bottom: 1px solid var(--border);
    position: relative;
}

.search-input {
    width: 100%;
    padding: 7px 10px 7px 30px;
    background: var(--surface-2);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text-2);
    font-family: var(--font-body);
    font-size: 12px;
    transition: all 0.2s;
}

.search-input::placeholder { color: var(--text-3); }

.search-input:focus {
    outline: none;
    border-color: var(--accent);
    color: var(--text);
    background: var(--surface-3);
    box-shadow: 0 0 0 3px var(--accent-glow2);
}

.search-icon {
    position: absolute;
    left: 22px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 15px;
    color: var(--text-3);
    pointer-events: none;
}

.sidebar-content {
    flex: 1;
    overflow-y: auto;
    padding: 10px 8px;
}

.sidebar-footer {
    padding: 12px;
    border-top: 1px solid var(--border);
    display: flex;
    gap: 8px;
}

.tree-node {
    padding: 7px 10px;
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-family: var(--font-body);
    font-size: 13px;
    font-weight: 400;
    display: flex;
    align-items: center;
    gap: 7px;
    margin-bottom: 1px;
    transition: background 0.15s, transform 0.15s var(--ease-spring), box-shadow 0.15s;
    position: relative;
}

.tree-node:hover {
    background: var(--surface-2);
    box-shadow: inset 2px 0 0 var(--accent);
}

.tree-node-edit-btn {
    width: 28px;
    align-self: stretch;
    background: transparent;
    border: 1px solid transparent;
    border-radius: 5px;
    color: var(--text-3);
    font-size: 13px;
    cursor: pointer;
    display: flex; align-items: center; justify-content: center;
    opacity: 0;
    transition: opacity 0.12s, background 0.12s, border-color 0.12s;
    flex-shrink: 0; padding: 0;
}
.tree-node:hover .tree-node-edit-btn { opacity: 1; }
.tree-node-edit-btn:hover {
    background: var(--surface-3);
    border-color: var(--border);
    color: var(--text);
}

.tree-node:active {
    transform: scale(0.98);
}

.tree-node.dragging {
    opacity: 0.4;
    transform: scale(0.97);
}

.tree-node.drag-over {
    background: var(--surface-3);
    border: 1px dashed var(--accent);
    box-shadow: inset 0 0 12px var(--accent-glow);
}

.tree-arrow {
    width: 14px;
    color: var(--text-3);
    font-size: 9px;
    text-align: center;
    flex-shrink: 0;
}

.folder-dot {
    width: 7px;
    height: 7px;
    border-radius: 50%;
    flex-shrink: 0;
}

.course-badge {
    margin-left: auto;
    font-family: var(--font-mono);
    font-size: 10px;
    color: var(--text-3);
    background: var(--surface-2);
    padding: 2px 6px;
    border-radius: 4px;
    letter-spacing: 0.02em;
    border: 1px solid var(--border);
    flex-shrink: 0;
}

.main {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    position: relative;
    z-index: 1;
}

.topbar {
    height: var(--topbar-h);
    padding: 0 18px;
    background: var(--glass);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: relative;
    z-index: 5;
}

.topbar-left {
    display: flex;
    align-items: center;
    gap: 14px;
}

.sidebar-toggle {
    width: 34px;
    height: 34px;
    background: transparent;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    cursor: pointer;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 4px;
    padding: 0;
    transition: all 0.2s;
}

.sidebar-toggle:hover {
    background: var(--surface-2);
    border-color: var(--border-2);
}

.sidebar-toggle span {
    display: block;
    width: 14px;
    height: 1.5px;
    background: var(--text-2);
    border-radius: 1px;
    transition: all 0.25s var(--ease-out);
}

.sidebar-toggle:hover span { background: var(--text); }

.view-toggle {
    display: flex;
    background: var(--surface-2);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 3px;
    gap: 2px;
}

.view-btn {
    padding: 5px 12px;
    border: none;
    background: transparent;
    color: var(--text-3);
    border-radius: 5px;
    cursor: pointer;
    font-family: var(--font-ui);
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 0.02em;
    transition: all 0.2s var(--ease-out);
}

.view-btn.active {
    background: var(--accent);
    color: var(--bg);
    box-shadow: 0 0 12px var(--accent-glow);
}

.view-btn:not(.active):hover {
    color: var(--text-2);
    background: var(--surface-3);
}

.date-nav {
    display: flex;
    align-items: center;
    gap: 6px;
}

.nav-btn {
    width: 28px;
    height: 28px;
    border: 1px solid var(--border);
    background: transparent;
    color: var(--text-2);
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 16px;
    font-family: var(--font-ui);
    transition: all 0.15s;
    display: flex;
    align-items: center;
    justify-content: center;
}

.nav-btn:hover {
    background: var(--surface-2);
    color: var(--text);
    border-color: var(--border-2);
}

.nav-today {
    width: auto;
    padding: 0 8px;
    font-family: var(--font-ui);
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 0.04em;
}

.date-label {
    font-family: var(--font-ui);
    font-size: 13px;
    font-weight: 600;
    color: var(--text-2);
    min-width: 190px;
    text-align: center;
    letter-spacing: 0.01em;
}

.toolbar {
    display: flex;
    align-items: center;
    gap: 6px;
}

.toolbar-divider {
    width: 1px;
    height: 20px;
    background: var(--border);
    margin: 0 2px;
}

.btn {
    padding: 7px 13px;
    border: 1px solid var(--border);
    background: var(--surface-2);
    color: var(--text-2);
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-family: var(--font-ui);
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 0.02em;
    transition: all 0.18s var(--ease-out);
    display: flex;
    align-items: center;
    gap: 6px;
    white-space: nowrap;
}

.btn-icon {
    font-size: 11px;
    opacity: 0.8;
}

.btn:hover {
    background: var(--surface-3);
    border-color: var(--border-2);
    color: var(--text);
}

.btn:active {
    transform: scale(0.97);
}

.btn-ghost {
    background: transparent;
    border-color: var(--border);
}

.btn-ghost:hover {
    background: var(--surface-2);
}

.btn-primary {
    background: var(--accent);
    border-color: var(--accent);
    color: var(--bg);
    font-weight: 700;
    box-shadow: 0 0 0 var(--accent-glow);
    transition: all 0.2s var(--ease-out);
}

.btn-primary:hover {
    background: var(--accent-dim);
    border-color: var(--accent-dim);
    box-shadow: 0 4px 20px rgba(6, 200, 232, 0.25);
    transform: translateY(-1px);
}

.btn-danger {
    background: transparent;
    border-color: rgba(255, 0, 85, 0.3);
    color: var(--danger);
}

.btn-danger:hover {
    background: rgba(255, 0, 85, 0.1);
    border-color: var(--danger);
    color: var(--danger);
    box-shadow: 0 0 12px rgba(255, 0, 85, 0.15);
}

.icon-btn {
    width: 32px;
    height: 32px;
    border: 1px solid var(--border);
    background: transparent;
    color: var(--text-3);
    border-radius: var(--radius-sm);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.15s;
}

.icon-btn:hover {
    background: var(--surface-2);
    color: var(--text);
    border-color: var(--border-2);
}

.icon-btn:disabled {
    opacity: 0.25;
    cursor: not-allowed;
    pointer-events: none;
}

.calendar-wrapper {
    flex: 1;
    overflow: auto;
    padding: 16px;
    display: flex;
    flex-direction: column;
}

.calendar {
    display: grid;
    gap: 10px;
    flex: 1;
}
.calendar.week {
    grid-template-columns: repeat(7, 1fr);
}

.calendar.month {
    grid-template-columns: repeat(7, 1fr);
}

.day-column {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 12px;
    display: flex;
    flex-direction: column;
    min-height: 140px;
    transition: border-color 0.2s, box-shadow 0.2s, background 0.2s;
    position: relative;
    overflow: visible;
}

.day-column::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(to right, transparent, var(--border-2), transparent);
}

.day-column.today {
    border-color: rgba(107, 140, 255, 0.5);
    box-shadow: 0 0 0 1px rgba(107, 140, 255, 0.10), inset 0 1px 0 rgba(107, 140, 255, 0.06);
}
.day-column.today::before {
    background: linear-gradient(to right, transparent, var(--accent), transparent);
    opacity: 0.6;
}


.day-column.drag-over {
    border-color: var(--accent);
    border-style: dashed;
    background: var(--surface-2);
    box-shadow: inset 0 0 20px var(--accent-glow2);
}

.day-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 10px;
}

.day-label-group {
    display: flex;
    flex-direction: column;
    gap: 1px;
}

.day-name {
    font-family: var(--font-ui);
    font-size: 10px;
    font-weight: 600;
    color: var(--text-3);
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

.day-number {
    font-family: var(--font-mono);
    font-size: 22px;
    font-weight: 600;
    color: var(--text);
    line-height: 1;
    letter-spacing: -0.04em;
}

.day-column.today .day-number {
    color: var(--accent);
}

.day-task-count {
    font-family: var(--font-mono);
    font-size: 10px;
    color: var(--text-3);
    background: var(--surface-2);
    border: 1px solid var(--border);
    padding: 2px 6px;
    border-radius: 4px;
    letter-spacing: 0.02em;
}
.day-body {
    display: flex;
    flex-direction: column;
    gap: 6px;
    flex: 1;
    justify-content: flex-start;
}

.task-card {
    background: var(--surface);
    border: none;
    border-radius: 8px;
    padding: 7px 10px 6px;
    cursor: pointer;
    transition: background 0.12s, box-shadow 0.12s, opacity 0.12s;
    position: relative;
    overflow: visible;
    user-select: none;
    -webkit-user-select: none;
    cursor: grab;
}

.task-card::before { display: none; }

.task-card:hover { background: var(--surface-2); box-shadow: 0 4px 20px rgba(0,0,0,0.2); }
.task-card:active { opacity: 0.6; }
.task-card.dragging { opacity: 0.25; }

.task-card.done {
    opacity: 0.45;
    box-shadow: none !important;
}
.task-card.done:hover {
    opacity: 0.85;
}
.task-card.done .task-name {
    text-decoration: line-through;
    color: var(--text-2);
}

.task-check {
    width: 16px; height: 16px; border-radius: 50%;
    border: 1.5px solid var(--border-2);
    flex-shrink: 0;
    display: flex; align-items: center; justify-content: center;
    font-size: 9px; color: transparent;
    background: transparent;
    transition: all 0.12s;
    margin-top: 1px;
}
.task-card.done .task-check {
    background: var(--success);
    border-color: var(--success);
    color: #0f1117;
}
.task-card:hover:not(.done) .task-check { border-color: var(--text-2); }

.task-top {
    display: flex; align-items: flex-start;
    gap: 6px; margin-bottom: 3px;
}

.task-name {
    font-family: var(--font-body);
    font-size: 11.5px;
    font-weight: 500;
    color: var(--text);
    line-height: 1.3;
    flex: 1;
    letter-spacing: -0.01em;
}

.task-progress {
    height: 2px;
    border-radius: 2px;
    background: var(--border);
    margin-bottom: 4px;
    overflow: hidden;
    position: relative;
}
.task-progress-fill {
    position: absolute; left: 0; top: 0; bottom: 0;
    border-radius: 2px;
    background: var(--accent);
    transition: width 0.2s;
}
.task-card.done .task-progress-fill { background: var(--success); }

.task-meta {
    display: flex; justify-content: space-between;
    align-items: center; gap: 6px;
}

.task-path {
    font-family: var(--font-body); font-size: 11px; font-weight: 500; color: var(--text-2);
    overflow: hidden; text-overflow: ellipsis; white-space: nowrap; max-width: 65%;
}

.task-badge {
    font-family: var(--font-mono); font-size: 11px; font-weight: 800;
    color: var(--text); background: var(--surface-3);
    border: 1px solid var(--border-2); padding: 3px 9px;
    border-radius: 20px; letter-spacing: 0.04em;
    white-space: nowrap; flex-shrink: 0;
}

.task-badge.j0 {
    color: #fff;
    border-color: var(--accent);
    background: var(--accent);
    font-weight: 800;
}

.modal {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(5, 7, 11, 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    align-items: center;
    justify-content: center;
    z-index: 1000;
    animation: none;
}

.modal.open {
    display: flex;
    animation: modal-bg-in 0.25s ease;
}

@keyframes modal-bg-in {
    from { opacity: 0; }
    to   { opacity: 1; }
}

.modal-card {
    background: var(--surface);
    border: 1px solid var(--border-2);
    border-radius: var(--radius-lg);
    padding: 28px;
    width: 420px;
    max-width: 92vw;
    box-shadow: 0 32px 64px rgba(0, 0, 0, 0.6), 0 0 0 1px rgba(255,255,255,0.02);
    animation: modal-in 0.3s var(--ease-spring);
    position: relative;
    overflow-y: auto;
    max-height: 90vh;
}

.modal-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(to right, transparent, var(--accent), transparent);
    opacity: 0.5;
}

@keyframes modal-in {
    from {
        opacity: 0;
        transform: scale(0.93) translateY(16px);
    }
    to {
        opacity: 1;
        transform: scale(1) translateY(0);
    }
}

.modal-header {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 24px;
}

.modal-icon {
    font-size: 18px;
    color: var(--accent);
    opacity: 0.8;
    line-height: 1;
}

.modal-title {
    font-family: var(--font-ui);
    font-size: 17px;
    font-weight: 700;
    color: var(--text);
    letter-spacing: -0.02em;
}

.form-group {
    margin-bottom: 18px;
}

.form-label {
    display: block;
    font-family: var(--font-ui);
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--text-3);
    margin-bottom: 7px;
}

.form-input {
    width: 100%;
    padding: 10px 12px;
    background: var(--surface-2);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text);
    font-family: var(--font-body);
    font-size: 14px;
    transition: all 0.18s;
    -webkit-appearance: none;
    appearance: none;
}

.form-input::placeholder {
    color: var(--text-3);
}

.form-input:focus {
    outline: none;
    border-color: var(--accent);
    background: var(--surface-3);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

input[type="date"].form-input {
    font-family: var(--font-mono);
    font-size: 13px;
    color-scheme: dark;
}

.form-hint {
    display: block;
    font-size: 11px;
    color: var(--text-3);
    margin-top: 5px;
    font-style: italic;
}

.color-palette {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.color-opt {
    width: 30px;
    height: 30px;
    border-radius: 7px;
    cursor: pointer;
    border: 2px solid transparent;
    transition: all 0.2s var(--ease-spring);
    position: relative;
}

.color-opt::after {
    content: '';
    position: absolute;
    inset: -4px;
    border-radius: 9px;
    border: 2px solid transparent;
    transition: border-color 0.2s;
}

.color-opt:hover {
    transform: scale(1.15);
}

.color-opt.selected {
    transform: scale(1.15);
    box-shadow: 0 0 0 2px var(--bg), 0 0 0 4px currentColor;
}

.modal-footer {
    display: flex;
    flex-wrap: wrap;
    row-gap: 8px;
    gap: 8px;
    margin-top: 24px;
    justify-content: flex-end;
    padding-top: 18px;
    border-top: 1px solid var(--border);
}
.modal-footer-split {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    row-gap: 10px;
}
.modal-footer-left,
.modal-footer-right {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

#toastContainer {
    position: fixed;
    bottom: 24px;
    right: 24px;
    z-index: 2000;
    display: flex;
    flex-direction: column;
    gap: 8px;
    pointer-events: none;
}

.toast {
    background: var(--surface-3);
    border: 1px solid var(--border-2);
    color: var(--text);
    padding: 11px 16px;
    border-radius: var(--radius);
    font-family: var(--font-body);
    font-size: 13px;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
    animation: toast-in 0.35s var(--ease-spring);
    display: flex;
    align-items: center;
    gap: 8px;
    pointer-events: auto;
    border-left: 2px solid var(--accent);
}

.toast.success {
    border-left-color: var(--success);
}

.toast.error {
    border-left-color: var(--danger);
}

@keyframes toast-in {
    from {
        transform: translateX(120%) scale(0.9);
        opacity: 0;
    }
    to {
        transform: translateX(0) scale(1);
        opacity: 1;
    }
}

@media (max-width: 900px) {
    .sidebar {
        position: absolute;
        height: 100%;
        z-index: 100;
        box-shadow: 8px 0 32px rgba(0, 0, 0, 0.5);
    }

    .calendar.week {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (max-width: 600px) {
    :root { --sidebar-w: 240px; }

    .calendar.week {
        grid-template-columns: 1fr;
    }

    .date-label {
        min-width: auto;
        font-size: 12px;
    }

    .view-toggle,
    .date-nav { gap: 4px; }

    .topbar { padding: 0 12px; gap: 10px; }
}

.sidebar { animation: slide-in-left 0.5s var(--ease-out) both; }
.topbar { animation: fade-down 0.4s var(--ease-out) 0.1s both; }
.calendar-wrapper { animation: fade-up 0.5s var(--ease-out) 0.15s both; }

@keyframes cal-slide {
    from { opacity: 0; transform: translateY(6px); }
    to   { opacity: 1; transform: translateY(0); }
}
.calendar.animating {
    animation: cal-slide 0.18s var(--ease-out);
}

@keyframes slide-in-left {
    from { transform: translateX(-20px); opacity: 0; }
    to   { transform: translateX(0); opacity: 1; }
}

@keyframes fade-down {
    from { transform: translateY(-8px); opacity: 0; }
    to   { transform: translateY(0); opacity: 1; }
}

@keyframes fade-up {
    from { transform: translateY(12px); opacity: 0; }
    to   { transform: translateY(0); opacity: 1; }
}

.filter-active-bar {
    font-family: var(--font-mono);
    font-size: 10px;
    color: var(--accent);
    background: var(--accent-glow);
    border: 1px solid rgba(6,200,232,0.2);
    border-radius: 4px;
    padding: 3px 8px;
    margin: 6px 8px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 6px;
    cursor: pointer;
    letter-spacing: 0.04em;
}
.filter-active-bar:hover { background: var(--accent-glow2); }

.tree-children {
    position: relative;
    margin-left: 10px;
    border-left: 1px solid var(--border);
    padding-left: 0;
}

.tree-node {
    border-radius: 5px;
    padding: 5px 8px;
    font-size: 12.5px;
    font-weight: 400;
    gap: 6px;
}

.tree-children > div > .tree-node::before {
    content: '';
    position: absolute;
    left: -18px;
    top: 50%;
    width: 14px;
    height: 1px;
    background: var(--border);
}

.tree-node { position: relative; }

.tree-node:has(.folder-dot),
.tree-node.is-folder {
    font-weight: 600;
    color: var(--text);
    font-size: 13.5px;
    padding-top: 9px;
    padding-bottom: 9px;
}

.tree-node:has(.course-dot),
.tree-node.is-course {
    color: var(--text-2);
    font-weight: 400;
}

.tree-node:has(.course-dot):hover,
.tree-node.is-course:hover {
    color: var(--text);
}
.tree-arrow {
    font-size: 8px;
    color: var(--text-3);
    width: 12px;
    flex-shrink: 0;
    transition: transform 0.15s;
}

.color-picker-wrap { display: flex; flex-direction: column; gap: 10px; }

.color-wheel-input {
    width: 44px; height: 30px;
    border: 1px solid var(--border-2);
    border-radius: var(--radius-sm);
    background: var(--surface-2);
    cursor: pointer; padding: 2px;
    -webkit-appearance: none;
    appearance: none;
}
.color-wheel-input::-webkit-color-swatch-wrapper { padding: 0; border-radius: 4px; }
.color-wheel-input::-webkit-color-swatch { border: none; border-radius: 4px; }

.datepicker-wrap { position: relative; }

.datepicker-display {
    cursor: pointer; user-select: none;
    display: flex; align-items: center; justify-content: space-between;
}
.datepicker-display::after {
    content: '▾'; color: var(--text-3); font-size: 11px; flex-shrink: 0;
}

.datepicker-popup {
    position: absolute; top: calc(100% + 6px); left: 0;
    width: 240px;
    background: var(--surface-2); border: 1px solid var(--border-2);
    border-radius: var(--radius); padding: 10px; z-index: 2000;
    box-shadow: 0 12px 32px rgba(0,0,0,0.45); display: none;
}

.datepicker-popup.visible { display: block; animation: ctx-in 0.15s var(--ease-out); }

.dp-header {
    display: flex; align-items: center; justify-content: space-between;
    margin-bottom: 8px;
}
.dp-month {
    font-family: var(--font-ui); font-size: 12px; font-weight: 600;
    color: var(--text); text-transform: capitalize;
}

.dp-nav {
    width: 26px; height: 26px; background: transparent;
    border: 1px solid var(--border); border-radius: 5px;
    color: var(--text-2); cursor: pointer; font-size: 15px;
    display: flex; align-items: center; justify-content: center;
    transition: all 0.15s;
}
.dp-nav:hover { background: var(--surface-3); color: var(--text); }

.dp-grid {
    display: grid; grid-template-columns: repeat(7, 1fr); gap: 2px;
    margin-bottom: 10px;
}
.dp-dow {
    text-align: center; font-family: var(--font-ui); font-size: 9px;
    font-weight: 600; color: var(--text-3); letter-spacing: 0.03em;
    padding: 3px 0; text-transform: uppercase;
}
.dp-day {
    aspect-ratio: 1; border: none; background: transparent;
    color: var(--text-2); border-radius: 4px; cursor: pointer;
    font-family: var(--font-body); font-size: 11px;
    transition: all 0.12s; display: flex; align-items: center; justify-content: center;
    min-width: 0;
}

.dp-day:hover { background: var(--surface-3); color: var(--text); }
.dp-day.dp-today {
    color: var(--accent);
    font-weight: 700;
    background: transparent;
    border: 1.5px solid var(--accent);
    border-radius: 4px;
}
.dp-day.dp-selected { background: var(--accent); color: var(--bg); font-weight: 600; }
.dp-day.dp-selected:hover { background: var(--accent-dim); }
.dp-day.dp-today.dp-selected {
    background: var(--accent);
    color: var(--bg);
    border-color: var(--bg);
    box-shadow: 0 0 0 1.5px var(--accent);
}

.dp-footer {
    border-top: 1px solid var(--border); padding-top: 8px;
    display: flex; justify-content: center;
}
.dp-today-btn {
    background: transparent; border: none; color: var(--accent);
    font-family: var(--font-body); font-size: 12px; cursor: pointer;
    padding: 4px 12px; border-radius: 4px; transition: background 0.12s;
}
.dp-today-btn:hover { background: var(--accent-glow); }

.interval-chips { display: flex; flex-wrap: wrap; gap: 6px; }

.preset-profile-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 7px 14px;
    border: 1px solid rgba(107,140,255,0.3);
    border-radius: var(--radius-sm);
    background: var(--accent-glow);
    color: var(--accent);
    font-family: var(--font-ui);
    font-size: 12px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.18s var(--ease-out);
    letter-spacing: 0.01em;
}
.preset-profile-btn:hover {
    background: rgba(107,140,255,0.18);
    border-color: var(--accent);
    transform: translateY(-1px);
    box-shadow: 0 4px 14px var(--accent-glow);
}
.preset-profile-btn:active { transform: scale(0.97); }
.preset-profile-btn.profile-active {
    background: rgba(107,140,255,0.22);
    border-color: var(--accent);
    box-shadow: 0 0 0 1px var(--accent);
    color: var(--text);
}

.interval-chip {
    padding: 5px 12px; border: 1px solid var(--border);
    border-radius: 20px; background: var(--surface-2);
    color: var(--text-3); font-family: var(--font-mono); font-size: 11px;
    cursor: pointer; transition: all 0.15s; user-select: none;
}
.interval-chip:hover { border-color: var(--border-2); color: var(--text-2); }
.interval-chip.active {
    background: var(--accent-glow); border-color: rgba(107,140,255,0.4);
    color: var(--accent); font-weight: 600;
}

.interval-chips-wrap { display: flex; flex-direction: column; gap: 8px; }

.interval-add-row {
    display: flex; gap: 6px; align-items: center;
}
.interval-add-input {
    width: 70px; padding: 5px 8px;
    background: var(--surface-2); border: 1px solid var(--border);
    border-radius: 20px; color: var(--text);
    font-family: var(--font-mono); font-size: 11px;
    text-align: center; transition: border-color 0.15s;
}
.interval-add-input::placeholder { color: var(--text-3); }
.interval-add-input:focus { outline: none; border-color: var(--accent);}

.interval-add-btn {
    padding: 5px 10px; border: 1px dashed var(--border);
    border-radius: 20px; background: transparent;
    color: var(--text-3); font-family: var(--font-mono); font-size: 11px;
    cursor: pointer; transition: all 0.15s;
}
.interval-add-btn:hover { border-color: var(--accent); color: var(--accent); }

.interval-active-list {
    display: flex; flex-wrap: wrap; gap: 5px;
    min-height: 28px;
}
.interval-chip-active {
    padding: 4px 10px; border: 1px solid rgba(107,140,255,0.35);
    border-radius: 20px; background: var(--accent-glow);
    color: var(--accent); font-family: var(--font-mono); font-size: 11px;
    cursor: pointer; transition: all 0.15s; display: flex; align-items: center; gap: 5px;
}
.interval-chip-active:hover { background: rgba(224,85,112,0.1); border-color: var(--danger); color: var(--danger); }
.interval-chip-active::after { content: '×'; font-size: 12px; opacity: 0.6; }

.interval-presets-label {
    font-family: var(--font-ui); font-size: 10px; font-weight: 600;
    color: var(--text-3); letter-spacing: 0.06em; text-transform: uppercase;
}

.task-card.overdue { border-color: rgba(224,150,58,0.55) !important; }
.task-card.overdue .task-badge {
    color: var(--warn); border-color: rgba(224,150,58,0.35);
    background: rgba(224,150,58,0.08);
}
.task-card.overdue::after {
    content: '!'; position: absolute; top: 7px; right: 8px;
    font-size: 9px; font-weight: 700; font-family: var(--font-mono);
    color: var(--warn); opacity: 0.7;
}

.status-filter-bar {
    display: flex; align-items: center; gap: 6px;
    padding: 7px 16px; border-bottom: 1px solid var(--border);
    background: var(--glass); backdrop-filter: blur(16px); flex-shrink: 0;
}
.status-filter-bar > span:first-child {
    font-family: var(--font-mono); font-size: 10px;
    color: var(--text-3); letter-spacing: 0.05em; margin-right: 2px;
}
.sfb-btn {
    padding: 4px 11px; border: 1px solid var(--border); border-radius: 20px;
    background: transparent; color: var(--text-3);
    font-family: var(--font-mono); font-size: 10px;
    cursor: pointer; transition: all 0.15s;
}
.sfb-btn:hover { color: var(--text-2); border-color: var(--border-2); }
.sfb-btn.active { background: var(--accent-glow); border-color: rgba(107,140,255,0.4); color: var(--accent); }
.sfb-btn.sfb-overdue.active { background: rgba(224,150,58,0.1); border-color: rgba(224,150,58,0.4); color: var(--warn); }
.sfb-btn.sfb-done.active { background: rgba(74,222,154,0.1); border-color: rgba(74,222,154,0.4); color: var(--success); }
#sfb-count { margin-left: auto; font-family: var(--font-mono); font-size: 10px; color: var(--text-3); }

.course-badge.due-today {
    color: var(--accent); border-color: rgba(107,140,255,0.4);
    background: var(--accent-glow); font-weight: 700;
    animation: pulse-badge 2.5s ease-out infinite;
}
@keyframes pulse-badge {
    0%,100% { box-shadow: 0 0 0 0 var(--accent-glow); }
    50%      { box-shadow: 0 0 7px 2px var(--accent-glow); }
}

.calendar.focus {
    display: flex;
    flex-direction: column;
    max-width: 820px;
    margin: 0 auto;
    width: 100%;
}
.calendar.focus .day-column {
    flex: 1;
    min-height: 0;
    padding: 28px 32px;
}
.calendar.focus .day-body { gap: 12px; }
.calendar.focus .task-card { padding: 16px 20px; border-radius: 12px; }
.calendar.focus .task-name { font-size: 16px; line-height: 1.5; }
.calendar.focus .task-badge { font-size: 13px; padding: 5px 14px; }
.calendar.focus .task-path { font-size: 12px; }
.calendar.focus .task-meta { margin-top: 6px; }
.calendar.focus .day-number { font-size: 36px; }
.calendar.focus .day-name { font-size: 13px; letter-spacing: 0.1em; }
.calendar.focus .day-header { margin-bottom: 18px; }

.day-check-all {
    width: 22px; height: 22px; border: 1px solid var(--border);
    border-radius: 5px; background: transparent; color: var(--text-3);
    cursor: pointer; display: flex; align-items: center;
    justify-content: center; font-size: 10px; transition: all 0.15s;
}
.day-check-all:hover { background: var(--success); border-color: var(--success); color: var(--bg); }
.day-check-all.all-done {
    background: var(--success);
    border-color: var(--success);
    color: var(--bg);
}
#statsModal .modal-card { width: 500px; max-height: 85vh; overflow-y: auto; }
.stats-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin-bottom: 20px; }
.stat-card {
    background: var(--surface-2); border: 1px solid var(--border);
    border-radius: var(--radius); padding: 13px 15px;
    display: flex; flex-direction: column; gap: 3px;
}
.stat-label { font-family: var(--font-ui); font-size: 10px; font-weight: 600; letter-spacing: 0.06em; text-transform: uppercase; color: var(--text-3); }
.stat-value { font-family: var(--font-mono); font-size: 26px; font-weight: 600; color: var(--text); letter-spacing: -0.04em; line-height: 1; }
.stat-sub   { font-size: 11px; color: var(--text-3); }
.stats-sep  { font-family: var(--font-ui); font-size: 10px; font-weight: 600; letter-spacing: 0.06em; text-transform: uppercase; color: var(--text-3); margin: 16px 0 10px; }
.folder-stat { display: flex; align-items: center; gap: 10px; margin-bottom: 9px; }
.folder-stat-dot { width: 7px; height: 7px; border-radius: 50%; flex-shrink: 0; }
.folder-stat-name { font-size: 12px; color: var(--text-2); flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.folder-stat-bar { width: 100px; height: 4px; background: var(--border); border-radius: 2px; overflow: hidden; flex-shrink: 0; }
.folder-stat-fill { height: 100%; border-radius: 2px; transition: width 0.5s var(--ease-out); }
.folder-stat-pct { font-family: var(--font-mono); font-size: 10px; color: var(--text-3); width: 28px; text-align: right; flex-shrink: 0; }
.heatmap-wrap { overflow-x: auto; padding-bottom: 4px; }
.heatmap-grid { display: flex; gap: 3px; }
.heatmap-col  { display: flex; flex-direction: column; gap: 3px; }
.heatmap-cell {
    width: 13px; height: 13px; border-radius: 2px;
    background: var(--surface-3); flex-shrink: 0; transition: transform 0.1s; cursor: default;
}
.heatmap-cell:hover { transform: scale(1.4); z-index: 2; position: relative; }
.heatmap-cell[data-n="1"] { background: rgba(107,140,255,0.20); }
.heatmap-cell[data-n="2"] { background: rgba(107,140,255,0.45); }
.heatmap-cell[data-n="3"] { background: rgba(107,140,255,0.70); }
.heatmap-cell[data-n="4"] { background: var(--accent); }

.task-card.dragging { opacity: 0.12 !important; pointer-events: none !important; transform: scale(0.97) !important; }
.task-placeholder {
    border: 2px dashed var(--accent);
    border-radius: 8px;
    background: linear-gradient(135deg, var(--accent-glow) 0%, transparent 100%);
    pointer-events: none;
    transition: height 0.15s var(--ease-out);
    animation: ph-pulse 1s ease-in-out infinite alternate;
    position: relative;
}
.task-placeholder::after {
    content: '';
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    width: 20px;
    height: 2px;
    background: var(--accent);
    border-radius: 2px;
    opacity: 0.6;
}
@keyframes ph-pulse {
    from { opacity: 0.5; box-shadow: none; }
    to   { opacity: 1; box-shadow: 0 0 12px var(--accent-glow); }
}
.task-card.just-dropped {
    animation: card-drop 0.4s var(--ease-spring);
}
@keyframes card-drop {
    0%   { opacity: 0; transform: translateX(-10px) scale(0.95); }
    60%  { transform: translateX(3px) scale(1.01); }
    100% { opacity: 1; transform: translateX(0) scale(1); }
}
.tree-node.drop-before { border-top: 2px solid var(--accent) !important; }
.tree-node.drop-after  { border-bottom: 2px solid var(--accent) !important; }
.tree-node.selected { background: var(--accent-glow) !important; box-shadow: inset 2px 0 0 var(--accent); }