/* =========================================================
   TASKFLOW — PROFESSIONAL V2.2
   PREMIUM PRODUCTIVITY DASHBOARD
   ========================================================= */


/* =========================================================
   01. DESIGN SYSTEM
   ========================================================= */

:root {
    --primary: #2563eb;
    --primary-hover: #1d4ed8;
    --primary-soft: #eff6ff;
    --primary-border: #bfdbfe;

    --bg: #f8fafc;
    --surface: #ffffff;
    --surface-soft: #f8fafc;
    --surface-hover: #f1f5f9;

    --text: #0f172a;
    --text-secondary: #475569;
    --muted: #94a3b8;

    --border: #e2e8f0;
    --border-light: #edf1f5;

    --green: #16a34a;
    --green-soft: #f0fdf4;
    --green-border: #bbf7d0;

    --orange: #d97706;
    --orange-soft: #fffbeb;
    --orange-border: #fde68a;

    --red: #dc2626;
    --red-soft: #fef2f2;
    --red-border: #fecaca;

    --purple: #7c3aed;
    --purple-soft: #f5f3ff;
    --purple-border: #ddd6fe;

    --sidebar-width: 250px;
    --topbar-height: 72px;

    --radius-xs: 5px;
    --radius-sm: 7px;
    --radius-md: 10px;
    --radius-lg: 14px;
    --radius-xl: 18px;

    --shadow-xs:
        0 1px 2px rgba(15, 23, 42, 0.03);

    --shadow-sm:
        0 1px 3px rgba(15, 23, 42, 0.05);

    --shadow-md:
        0 5px 16px rgba(15, 23, 42, 0.07);

    --shadow-lg:
        0 16px 40px rgba(15, 23, 42, 0.12);

    --transition-fast: 0.15s ease;
    --transition: 0.2s ease;
    --transition-slow: 0.3s ease;
}


/* =========================================================
   02. DARK MODE
   ========================================================= */

body.dark-mode {
    --primary: #3b82f6;
    --primary-hover: #60a5fa;
    --primary-soft: #172554;
    --primary-border: #1d4ed8;

    --bg: #0b1120;
    --surface: #111827;
    --surface-soft: #0f172a;
    --surface-hover: #172033;

    --text: #f8fafc;
    --text-secondary: #cbd5e1;
    --muted: #64748b;

    --border: #1e293b;
    --border-light: #172033;

    --green-soft: #052e16;
    --green-border: #166534;

    --orange-soft: #451a03;
    --orange-border: #92400e;

    --red-soft: #450a0a;
    --red-border: #991b1b;

    --purple-soft: #2e1065;
    --purple-border: #6d28d9;

    --shadow-xs:
        0 1px 2px rgba(0, 0, 0, 0.25);

    --shadow-sm:
        0 1px 3px rgba(0, 0, 0, 0.25);

    --shadow-md:
        0 8px 24px rgba(0, 0, 0, 0.24);

    --shadow-lg:
        0 20px 50px rgba(0, 0, 0, 0.38);
}


/* =========================================================
   03. RESET
   ========================================================= */

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

html {
    scroll-behavior: smooth;
}

body {
    min-height: 100vh;

    font-family:
        "Inter",
        -apple-system,
        BlinkMacSystemFont,
        "Segoe UI",
        sans-serif;

    background: var(--bg);
    color: var(--text);

    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;

    transition:
        background var(--transition),
        color var(--transition);
}

button,
input,
select,
textarea {
    font: inherit;
}

button {
    border: 0;
    cursor: pointer;
}

button:focus-visible,
a:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible {
    outline: 2px solid var(--primary);
    outline-offset: 2px;
}

a {
    color: inherit;
    text-decoration: none;
}

::selection {
    background: var(--primary);
    color: #ffffff;
}


/* =========================================================
   04. APP LAYOUT
   ========================================================= */

.app {
    min-height: 100vh;
}


/* =========================================================
   05. SIDEBAR
   ========================================================= */

.sidebar {
    position: fixed;
    inset: 0 auto 0 0;

    width: var(--sidebar-width);

    display: flex;
    flex-direction: column;

    background: var(--surface);
    border-right: 1px solid var(--border);

    z-index: 100;

    transition:
        background var(--transition),
        border-color var(--transition),
        transform var(--transition-slow);

    overflow: hidden;
}


/* =========================================================
   06. LOGO
   ========================================================= */

.logo {
    height: var(--topbar-height);

    display: flex;
    align-items: center;

    gap: 11px;

    padding: 0 22px;

    border-bottom: 1px solid var(--border-light);

    flex-shrink: 0;
}

.logo-mark {
    width: 32px;
    height: 32px;

    display: flex;
    align-items: center;
    justify-content: center;

    flex-shrink: 0;

    border-radius: 8px;

    background:
        linear-gradient(
            135deg,
            var(--primary),
            #1e40af
        );

    color: #ffffff;

    font-size: 14px;
    font-weight: 700;

    box-shadow:
        0 5px 12px rgba(37, 99, 235, 0.22);
}

.logo-text {
    display: flex;
    flex-direction: column;

    line-height: 1.15;
}

.logo-text strong {
    color: var(--text);

    font-size: 15px;
    font-weight: 700;

    letter-spacing: -0.25px;
}

.logo-text span {
    margin-top: 3px;

    color: var(--muted);

    font-size: 10px;
    font-weight: 500;

    letter-spacing: 0.4px;
}


/* =========================================================
   07. SIDEBAR NAVIGATION
   ========================================================= */

.menu {
    flex: 1;

    padding: 24px 14px;

    overflow-y: auto;
}

.menu-section {
    margin-bottom: 28px;
}

.menu-title {
    padding: 0 10px;
    margin-bottom: 8px;

    color: var(--muted);

    font-size: 9px;
    font-weight: 700;

    letter-spacing: 1px;
}

.menu-item {
    position: relative;

    height: 40px;

    display: flex;
    align-items: center;

    gap: 11px;

    padding: 0 11px;
    margin-bottom: 3px;

    border-radius: var(--radius-sm);

    color: var(--text-secondary);

    font-size: 12px;
    font-weight: 500;

    transition:
        background var(--transition-fast),
        color var(--transition-fast),
        transform var(--transition-fast);
}

.menu-item:hover {
    background: var(--surface-soft);
    color: var(--text);

    transform: translateX(1px);
}

.menu-item.active {
    background: var(--primary-soft);
    color: var(--primary);

    font-weight: 600;
}

.menu-item.active::before {
    content: "";

    position: absolute;

    left: -14px;
    top: 8px;
    bottom: 8px;

    width: 3px;

    border-radius: 0 3px 3px 0;

    background: var(--primary);
}

.menu-icon {
    width: 18px;

    display: flex;
    align-items: center;
    justify-content: center;

    flex-shrink: 0;

    color: currentColor;

    font-size: 16px;
    line-height: 1;
}

.category-dot {
    width: 7px;
    height: 7px;

    flex-shrink: 0;

    margin-left: 5px;
    margin-right: 6px;

    border-radius: 50%;
}

.category-dot.work {
    background: #2563eb;
}

.category-dot.personal {
    background: #16a34a;
}

.category-dot.study {
    background: #7c3aed;
}

.category-dot.other {
    background: #f59e0b;
}


/* =========================================================
   08. SIDEBAR BOTTOM
   ========================================================= */

.sidebar-bottom {
    padding: 14px;

    border-top: 1px solid var(--border-light);

    flex-shrink: 0;
}

.settings-btn {
    width: 100%;
    height: 40px;

    display: flex;
    align-items: center;

    gap: 11px;

    padding: 0 11px;

    background: transparent;

    border-radius: var(--radius-sm);

    color: var(--text-secondary);

    font-size: 12px;
    font-weight: 500;

    text-align: left;

    transition:
        background var(--transition-fast),
        color var(--transition-fast);
}

.settings-btn:hover {
    background: var(--surface-soft);
    color: var(--text);
}


/* =========================================================
   09. MAIN
   ========================================================= */

.main {
    min-height: 100vh;

    margin-left: var(--sidebar-width);
}


/* =========================================================
   10. TOPBAR
   ========================================================= */

.topbar {
    position: sticky;
    top: 0;

    height: var(--topbar-height);

    display: flex;
    align-items: center;
    justify-content: space-between;

    padding: 0 32px;

    background: color-mix(
        in srgb,
        var(--surface) 94%,
        transparent
    );

    border-bottom: 1px solid var(--border);

    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);

    z-index: 50;

    transition:
        background var(--transition),
        border-color var(--transition);
}

.topbar-left {
    display: flex;
    align-items: center;

    gap: 16px;
}

.breadcrumb {
    display: flex;
    align-items: center;

    gap: 8px;

    color: var(--muted);

    font-size: 11px;
}

.breadcrumb strong {
    color: var(--text);

    font-weight: 600;
}

.breadcrumb-separator {
    color: var(--border);
}

.top-actions {
    display: flex;
    align-items: center;

    gap: 5px;
}

.icon-btn {
    width: 36px;
    height: 36px;

    display: flex;
    align-items: center;
    justify-content: center;

    border-radius: 8px;

    background: transparent;

    color: var(--text-secondary);

    font-size: 18px;

    transition:
        background var(--transition-fast),
        color var(--transition-fast),
        transform var(--transition-fast);
}

.icon-btn:hover {
    background: var(--surface-soft);
    color: var(--text);

    transform: translateY(-1px);
}

.top-divider {
    width: 1px;
    height: 24px;

    margin: 0 8px;

    background: var(--border);
}

.avatar {
    width: 34px;
    height: 34px;

    display: flex;
    align-items: center;
    justify-content: center;

    border-radius: 50%;

    background: var(--primary-soft);
    color: var(--primary);

    font-size: 12px;
    font-weight: 700;

    transition:
        transform var(--transition-fast),
        box-shadow var(--transition-fast);
}

.avatar:hover {
    transform: translateY(-1px);

    box-shadow:
        0 4px 10px rgba(37, 99, 235, 0.14);
}

.mobile-menu-btn {
    display: none;

    width: 36px;
    height: 36px;

    align-items: center;
    justify-content: center;

    border-radius: 8px;

    background: transparent;
    color: var(--text);

    font-size: 18px;
}


/* =========================================================
   11. CONTENT
   ========================================================= */

.content {
    width: 100%;
    max-width: 1500px;

    margin: 0 auto;

    padding: 36px 40px 60px;
}


/* =========================================================
   12. PAGE HEADER
   ========================================================= */

.page-header {
    display: flex;
    align-items: flex-end;
    justify-content: space-between;

    gap: 30px;

    margin-bottom: 30px;
}

.page-heading .greeting {
    margin-bottom: 6px;

    color: var(--primary);

    font-size: 11px;
    font-weight: 600;

    letter-spacing: 0.25px;
}

.page-heading h1 {
    color: var(--text);

    font-size: 27px;
    line-height: 1.25;

    font-weight: 700;

    letter-spacing: -0.8px;
}

.page-heading .date {
    margin-top: 7px;

    color: var(--muted);

    font-size: 11px;
}

.add-task-btn {
    height: 40px;

    display: flex;
    align-items: center;
    justify-content: center;

    gap: 8px;

    padding: 0 16px;

    border-radius: 8px;

    background:
        linear-gradient(
            135deg,
            var(--primary),
            #1d4ed8
        );

    color: #ffffff;

    font-size: 11px;
    font-weight: 600;

    box-shadow:
        0 4px 10px rgba(37, 99, 235, 0.18);

    transition:
        background var(--transition),
        transform var(--transition),
        box-shadow var(--transition);
}

.add-task-btn:hover {
    background:
        linear-gradient(
            135deg,
            var(--primary-hover),
            #1e40af
        );

    transform: translateY(-1px);

    box-shadow:
        0 7px 16px rgba(37, 99, 235, 0.22);
}

.add-task-btn:active {
    transform: translateY(0);
}

.add-task-btn span:first-child {
    font-size: 18px;
    line-height: 1;
}


/* =========================================================
   13. STATISTICS
   ========================================================= */

.stats {
    display: grid;

    grid-template-columns:
        repeat(4, minmax(0, 1fr));

    gap: 16px;

    margin-bottom: 18px;
}

.stat-card {
    min-height: 112px;

    display: flex;
    align-items: center;
    justify-content: space-between;

    gap: 15px;

    padding: 20px;

    background: var(--surface);

    border: 1px solid var(--border);
    border-radius: var(--radius-md);

    box-shadow: var(--shadow-sm);

    transition:
        transform var(--transition),
        box-shadow var(--transition),
        border-color var(--transition);
}

.stat-card:hover {
    transform: translateY(-2px);

    box-shadow: var(--shadow-md);

    border-color: color-mix(
        in srgb,
        var(--border) 60%,
        var(--primary)
    );
}

.stat-card-content {
    min-width: 0;

    display: flex;
    flex-direction: column;

    gap: 7px;
}

.stat-label {
    color: var(--muted);

    font-size: 10px;
    font-weight: 500;
}

.stat-number {
    color: var(--text);

    font-size: 26px;
    line-height: 1;

    font-weight: 700;

    letter-spacing: -0.8px;
}

.stat-icon {
    width: 38px;
    height: 38px;

    display: flex;
    align-items: center;
    justify-content: center;

    flex-shrink: 0;

    border-radius: 10px;

    font-size: 16px;
    font-weight: 700;
}

.stat-icon.total {
    background: var(--primary-soft);
    color: var(--primary);
}

.stat-icon.completed {
    background: var(--green-soft);
    color: var(--green);
}

.stat-icon.pending {
    background: var(--orange-soft);
    color: var(--orange);
}

.stat-icon.overdue {
    background: var(--red-soft);
    color: var(--red);
}


/* =========================================================
   14. PRODUCTIVITY
   ========================================================= */

.productivity-card {
    padding: 22px 24px;

    margin-bottom: 18px;

    background: var(--surface);

    border: 1px solid var(--border);
    border-radius: var(--radius-md);

    box-shadow: var(--shadow-sm);
}

.productivity-header {
    display: flex;
    align-items: center;
    justify-content: space-between;

    gap: 20px;

    margin-bottom: 18px;
}

.section-label {
    display: block;

    margin-bottom: 6px;

    color: var(--muted);

    font-size: 9px;
    font-weight: 700;

    letter-spacing: 1px;
}

.productivity-header h2 {
    color: var(--text);

    font-size: 15px;
    font-weight: 600;

    letter-spacing: -0.2px;
}

.progress-percentage {
    color: var(--primary);

    font-size: 21px;
    font-weight: 700;

    letter-spacing: -0.5px;
}

.progress-info {
    display: flex;
    align-items: center;
    justify-content: space-between;

    gap: 20px;

    margin-bottom: 9px;

    color: var(--muted);

    font-size: 10px;
}

.progress-track {
    width: 100%;
    height: 7px;

    overflow: hidden;

    border-radius: 10px;

    background: var(--border-light);
}

.progress-bar {
    width: 0;
    height: 100%;

    border-radius: inherit;

    background:
        linear-gradient(
            90deg,
            var(--primary),
            #60a5fa
        );

    transition: width 0.4s ease;
}


/* =========================================================
   15. TASK SECTION
   ========================================================= */

.task-section {
    overflow: hidden;

    background: var(--surface);

    border: 1px solid var(--border);
    border-radius: var(--radius-md);

    box-shadow: var(--shadow-sm);
}

.section-header {
    padding: 22px 24px 18px;

    border-bottom: 1px solid var(--border-light);
}

.section-header h2 {
    margin-bottom: 5px;

    color: var(--text);

    font-size: 17px;
    font-weight: 600;

    letter-spacing: -0.3px;
}

.section-header p {
    color: var(--muted);

    font-size: 10px;
    line-height: 1.5;
}


/* =========================================================
   16. TASK TOOLBAR
   ========================================================= */

.task-toolbar {
    display: flex;
    align-items: center;

    gap: 10px;

    padding: 14px 24px;

    border-bottom: 1px solid var(--border-light);
}

.search-box {
    width: 230px;
    height: 36px;

    display: flex;
    align-items: center;

    gap: 8px;

    padding: 0 11px;

    background: var(--surface-soft);

    border: 1px solid var(--border);

    border-radius: 8px;

    transition:
        border-color var(--transition),
        box-shadow var(--transition),
        background var(--transition);
}

.search-box:focus-within {
    background: var(--surface);

    border-color: var(--primary);

    box-shadow:
        0 0 0 3px rgba(37, 99, 235, 0.08);
}

.search-icon {
    flex-shrink: 0;

    color: var(--muted);

    font-size: 17px;
}

.search-box input {
    width: 100%;

    border: none;
    outline: none;

    background: transparent;

    color: var(--text);

    font-size: 10px;
}

.search-box input::placeholder {
    color: var(--muted);
}

.filter-group {
    display: flex;
    align-items: center;

    gap: 8px;

    margin-left: auto;
}

.filter-group select {
    height: 36px;

    min-width: 120px;

    padding: 0 28px 0 10px;

    border: 1px solid var(--border);
    border-radius: 8px;

    background: var(--surface);
    color: var(--text-secondary);

    font-size: 10px;

    outline: none;

    cursor: pointer;

    transition:
        border-color var(--transition),
        box-shadow var(--transition),
        background var(--transition);
}

.filter-group select:hover,
.filter-group select:focus {
    border-color: var(--primary);

    box-shadow:
        0 0 0 3px rgba(37, 99, 235, 0.05);
}

.task-filter {
    display: flex;
    align-items: center;

    gap: 2px;

    padding: 3px;

    background: var(--surface-soft);

    border: 1px solid var(--border);

    border-radius: 8px;
}

.filter-btn {
    height: 28px;

    padding: 0 10px;

    border-radius: 5px;

    background: transparent;

    color: var(--muted);

    font-size: 10px;
    font-weight: 500;

    transition:
        background var(--transition-fast),
        color var(--transition-fast),
        box-shadow var(--transition-fast);
}

.filter-btn:hover {
    color: var(--text);
}

.filter-btn.active {
    background: var(--surface);

    color: var(--text);

    font-weight: 600;

    box-shadow:
        0 1px 3px rgba(15, 23, 42, 0.08);
}


/* =========================================================
   17. TASK LIST
   ========================================================= */

.task-list {
    min-height: 180px;
}

.task-item {
    position: relative;

    display: flex;
    align-items: flex-start;

    gap: 14px;

    padding: 15px 24px;

    border-bottom: 1px solid var(--border-light);

    transition:
        background var(--transition),
        border-color var(--transition);
}

.task-item:last-child {
    border-bottom: none;
}

.task-item:hover {
    background: var(--surface-soft);
}


/* =========================================================
   18. TASK CHECKBOX
   ========================================================= */

.task-checkbox {
    width: 18px;
    height: 18px;

    flex-shrink: 0;

    margin-top: 3px;

    display: flex;
    align-items: center;
    justify-content: center;

    border: 1.5px solid var(--border);
    border-radius: 50%;

    background: var(--surface);

    color: #ffffff;

    font-size: 10px;
    font-weight: 700;

    transition:
        background var(--transition-fast),
        border-color var(--transition-fast),
        transform var(--transition-fast);
}

.task-checkbox:hover {
    border-color: var(--primary);

    transform: scale(1.06);
}

.task-item.completed .task-checkbox {
    background: var(--green);
    border-color: var(--green);

    color: #ffffff;
}


/* =========================================================
   19. TASK CONTENT
   ========================================================= */

.task-content {
    flex: 1;

    min-width: 0;
}

.task-title-row {
    display: flex;
    align-items: flex-start;

    gap: 10px;
}

.task-title {
    margin-bottom: 4px;

    color: var(--text);

    font-size: 12px;
    font-weight: 600;

    line-height: 1.45;

    word-break: break-word;
}

.task-description {
    margin: 4px 0 7px;

    color: var(--text-secondary);

    font-size: 10px;
    line-height: 1.55;

    word-break: break-word;
}

.task-item.completed .task-title {
    color: var(--muted);

    text-decoration: line-through;
}

.task-item.completed .task-description {
    opacity: 0.65;
}

.task-meta {
    display: flex;
    align-items: center;

    flex-wrap: wrap;

    gap: 6px;

    margin-top: 6px;
}

.task-meta span {
    font-size: 9px;
}

.category {
    padding: 3px 7px;

    border-radius: 5px;

    background: var(--surface-soft);

    color: var(--text-secondary);

    border: 1px solid var(--border-light);

    font-weight: 500;
}

.category.work {
    background: var(--primary-soft);
    color: var(--primary);
}

.category.personal {
    background: var(--green-soft);
    color: var(--green);
}

.category.study {
    background: var(--purple-soft);
    color: var(--purple);
}

.category.others {
    background: var(--orange-soft);
    color: var(--orange);
}

.priority {
    padding: 3px 7px;

    border-radius: 5px;

    font-weight: 600;
}

.priority.normal {
    background: var(--surface-soft);
    color: var(--muted);
}

.priority.important {
    background: var(--orange-soft);
    color: var(--orange);
}

.priority.urgent {
    background: var(--red-soft);
    color: var(--red);
}

.deadline {
    color: var(--muted);

    white-space: nowrap;
}

.deadline-status {
    padding: 3px 7px;

    border-radius: 5px;

    font-size: 9px;

    font-weight: 600;

    white-space: nowrap;
}

.deadline-status.completed {
    background: var(--green-soft);
    color: var(--green);
}

.deadline-status.today {
    background: var(--orange-soft);
    color: var(--orange);
}

.deadline-status.upcoming {
    background: var(--primary-soft);
    color: var(--primary);
}

.deadline-status.overdue {
    background: var(--red-soft);
    color: var(--red);
}

.deadline-status.none {
    background: var(--surface-soft);
    color: var(--muted);
}


/* =========================================================
   20. TASK STATUS
   ========================================================= */

.task-status {
    display: inline-flex;
    align-items: center;

    gap: 5px;

    padding: 4px 8px;

    border-radius: 5px;

    font-size: 9px;
    font-weight: 600;

    line-height: 1;

    white-space: nowrap;
}

.task-status.not-started {
    background: #f1f5f9;
    color: #64748b;
}

.task-status.in-progress {
    background: #eff6ff;
    color: #2563eb;
}

.task-status.completed {
    background: #ecfdf5;
    color: #059669;
}

.task-status-dot {
    width: 5px;
    height: 5px;

    flex-shrink: 0;

    border-radius: 50%;

    background: currentColor;
}


/* =========================================================
   21. TASK ACTIONS
   ========================================================= */

.task-actions {
    display: flex;
    align-items: center;

    gap: 3px;

    flex-shrink: 0;

    opacity: 0;

    transition:
        opacity var(--transition),
        transform var(--transition);
}

.task-item:hover .task-actions {
    opacity: 1;
}

.task-action {
    width: 30px;
    height: 30px;

    display: flex;
    align-items: center;
    justify-content: center;

    border-radius: 7px;

    background: transparent;

    color: var(--muted);

    font-size: 14px;

    transition:
        background var(--transition-fast),
        color var(--transition-fast),
        transform var(--transition-fast);
}

.task-action:hover {
    background: var(--surface);

    color: var(--text);

    transform: translateY(-1px);
}

.task-action.delete:hover {
    color: var(--red);

    background: var(--red-soft);
}


/* =========================================================
   22. TASK DATE INFO
   ========================================================= */

.task-date-info {
    margin-top: -4px;
    margin-bottom: 18px;

    padding: 10px 12px;

    border: 1px solid var(--border);
    border-radius: 7px;

    background: var(--bg);

    color: var(--text-secondary);

    font-size: 10px;
    line-height: 1.5;
}

.task-date-info.error {
    border-color: var(--red-border);

    background: var(--red-soft);

    color: var(--red);
}


/* =========================================================
   23. EMPTY STATE
   ========================================================= */

.empty-state {
    min-height: 260px;

    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;

    padding: 35px 20px;

    text-align: center;
}

.empty-icon {
    width: 44px;
    height: 44px;

    display: flex;
    align-items: center;
    justify-content: center;

    margin-bottom: 14px;

    border: 1px solid var(--border);

    border-radius: 50%;

    background: var(--surface-soft);

    color: var(--muted);

    font-size: 17px;
}

.empty-state h3 {
    margin-bottom: 6px;

    color: var(--text);

    font-size: 13px;
    font-weight: 600;
}

.empty-state p {
    max-width: 300px;

    margin-bottom: 17px;

    color: var(--muted);

    font-size: 10px;
    line-height: 1.55;
}

.empty-add-btn {
    height: 34px;

    padding: 0 13px;

    border: 1px solid var(--border);
    border-radius: 7px;

    background: var(--surface);

    color: var(--text-secondary);

    font-size: 10px;
    font-weight: 600;

    transition:
        border-color var(--transition-fast),
        color var(--transition-fast),
        background var(--transition-fast),
        transform var(--transition-fast);
}

.empty-add-btn:hover {
    border-color: var(--primary);

    color: var(--primary);

    background: var(--primary-soft);

    transform: translateY(-1px);
}


/* =========================================================
   24. MODAL OVERLAY
   ========================================================= */

.modal {
    position: fixed;
    inset: 0;

    z-index: 1000;

    display: none;
    align-items: center;
    justify-content: center;

    padding: 20px;

    background: rgba(15, 23, 42, 0.48);

    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
}

.modal.active {
    display: flex;
}

.modal-content {
    width: 100%;
    max-width: 470px;

    max-height: 90vh;

    overflow-y: auto;

    padding: 24px;

    background: var(--surface);

    border: 1px solid var(--border);

    border-radius: var(--radius-lg);

    box-shadow: var(--shadow-lg);

    animation: modalIn 0.2s ease;
}

@keyframes modalIn {
    from {
        opacity: 0;
        transform: translateY(8px) scale(0.98);
    }

    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}


/* =========================================================
   25. MODAL HEADER
   ========================================================= */

.modal-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;

    gap: 20px;

    margin-bottom: 24px;
}

.modal-header h2 {
    color: var(--text);

    font-size: 18px;
    font-weight: 600;

    letter-spacing: -0.3px;
}

.close-btn {
    width: 32px;
    height: 32px;

    display: flex;
    align-items: center;
    justify-content: center;

    flex-shrink: 0;

    border-radius: 7px;

    background: transparent;

    color: var(--muted);

    font-size: 21px;

    transition:
        background var(--transition-fast),
        color var(--transition-fast);
}

.close-btn:hover {
    background: var(--surface-soft);

    color: var(--text);
}


/* =========================================================
   26. FORM
   ========================================================= */

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

.form-group label {
    display: block;

    margin-bottom: 7px;

    color: var(--text-secondary);

    font-size: 10px;
    font-weight: 600;
}

.required {
    color: var(--red);
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;

    border: 1px solid var(--border);
    border-radius: 8px;

    outline: none;

    background: var(--surface);
    color: var(--text);

    font-size: 10px;

    transition:
        border-color var(--transition),
        box-shadow var(--transition),
        background var(--transition);
}

.form-group input,
.form-group select {
    height: 40px;

    padding: 0 11px;
}

.form-group textarea {
    min-height: 80px;

    padding: 10px 11px;

    resize: vertical;

    line-height: 1.5;

    font-family: inherit;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    border-color: var(--primary);

    box-shadow:
        0 0 0 3px rgba(37, 99, 235, 0.08);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--muted);
}

.form-row {
    display: grid;

    grid-template-columns: 1fr 1fr;

    gap: 12px;
}


/* =========================================================
   27. MODAL ACTIONS
   ========================================================= */

.modal-actions {
    display: flex;
    justify-content: flex-end;

    gap: 8px;

    margin-top: 24px;
}

.cancel-btn,
.save-btn {
    height: 38px;

    padding: 0 15px;

    border-radius: 7px;

    font-size: 10px;
    font-weight: 600;

    transition:
        background var(--transition-fast),
        border-color var(--transition-fast),
        color var(--transition-fast),
        transform var(--transition-fast);
}

.cancel-btn {
    background: var(--surface-soft);

    color: var(--text-secondary);

    border: 1px solid var(--border);
}

.cancel-btn:hover {
    background: var(--surface-hover);

    color: var(--text);

    transform: translateY(-1px);
}

.save-btn {
    background: var(--primary);

    color: #ffffff;

    border: none;

    box-shadow:
        0 3px 8px rgba(37, 99, 235, 0.16);
}

.save-btn:hover {
    background: var(--primary-hover);

    transform: translateY(-1px);

    box-shadow:
        0 5px 12px rgba(37, 99, 235, 0.2);
}


/* =========================================================
   28. DELETE MODAL
   ========================================================= */

.delete-modal .modal-content {
    max-width: 360px;

    text-align: center;
}

.delete-modal-content {
    padding: 32px 24px !important;
}

.delete-modal-icon {
    width: 50px;
    height: 50px;

    display: flex;
    align-items: center;
    justify-content: center;

    margin: 0 auto 16px;

    border-radius: 50%;

    background: var(--red-soft);

    color: var(--red);

    font-size: 24px;
    font-weight: 700;

    line-height: 1;
}

.delete-modal h2 {
    margin-bottom: 8px;

    color: var(--text);

    font-size: 16px;
    font-weight: 600;
}

.delete-modal p {
    margin-bottom: 24px;

    color: var(--text-secondary);

    font-size: 10px;
    line-height: 1.6;
}

.delete-modal-actions {
    display: flex;
    justify-content: center;

    gap: 8px;
}

.delete-confirm-btn {
    height: 38px;

    padding: 0 15px;

    border-radius: 7px;

    background: var(--red);

    color: #ffffff;

    font-size: 10px;
    font-weight: 600;

    transition:
        background var(--transition-fast),
        transform var(--transition-fast);
}

.delete-confirm-btn:hover {
    background: #b91c1c;

    transform: translateY(-1px);
}


/* =========================================================
   29. CALENDAR
   ========================================================= */

.calendar-view {
    width: 100%;

    margin-top: 18px;

    color: var(--text);
}

.calendar-header {
    display: flex;
    align-items: center;
    justify-content: space-between;

    gap: 20px;

    margin-bottom: 18px;
}

.calendar-title {
    display: flex !important;
    flex-direction: column;

    align-items: flex-start !important;
    justify-content: flex-start !important;

    gap: 0 !important;
}

.calendar-title .section-label {
    margin-bottom: 5px;
}

.calendar-title h2 {
    margin: 0;

    color: var(--text);

    font-size: 20px;
    font-weight: 700;

    line-height: 1.25;

    letter-spacing: -0.5px;
}

.calendar-controls {
    display: flex !important;
    align-items: center !important;
    justify-content: flex-end !important;

    gap: 6px !important;
}

.calendar-btn,
.calendar-nav-btn {
    height: 36px;

    display: inline-flex;
    align-items: center;
    justify-content: center;

    border: 1px solid var(--border);
    border-radius: 8px;

    background: var(--surface);

    color: var(--text-secondary);

    font-size: 10px;
    font-weight: 600;

    transition:
        background var(--transition-fast),
        border-color var(--transition-fast),
        color var(--transition-fast),
        transform var(--transition-fast);
}

.calendar-btn {
    padding: 0 13px;
}

.calendar-nav-btn {
    width: 36px;

    padding: 0;

    font-size: 18px;

    line-height: 1;
}

.calendar-btn:hover,
.calendar-nav-btn:hover {
    background: var(--primary-soft);

    border-color: var(--primary);

    color: var(--primary);

    transform: translateY(-1px);
}


/* =========================================================
   30. CALENDAR GRID
   ========================================================= */

.calendar-grid {
    display: grid;

    grid-template-columns:
        repeat(7, minmax(0, 1fr));

    width: 100%;

    overflow: hidden;

    background: var(--surface);

    border: 1px solid var(--border);

    border-radius: var(--radius-md);

    box-shadow: var(--shadow-sm);
}

.calendar-grid > * {
    position: relative;

    min-width: 0;
    min-height: 105px;

    padding: 9px;

    background: var(--surface);

    border-right: 1px solid var(--border-light);
    border-bottom: 1px solid var(--border-light);

    transition:
        background var(--transition-fast),
        box-shadow var(--transition-fast);
}

.calendar-grid > *:nth-child(7n) {
    border-right: none;
}

.calendar-grid > *:nth-last-child(-n + 7) {
    border-bottom: none;
}

.calendar-grid > *:hover {
    background: var(--surface-soft);
}

.calendar-grid .calendar-weekday {
    min-height: 38px;

    display: flex;
    align-items: center;
    justify-content: center;

    padding: 7px;

    background: var(--surface-soft);

    color: var(--muted);

    font-size: 9px;
    font-weight: 700;

    text-transform: uppercase;

    letter-spacing: 0.7px;

    cursor: default;
}

.calendar-grid .calendar-weekday:hover {
    background: var(--surface-soft);
}

.calendar-grid .calendar-date {
    position: absolute;

    top: 8px;
    left: 8px;

    width: 27px;
    height: 27px;

    display: flex;
    align-items: center;
    justify-content: center;

    border-radius: 50%;

    color: var(--text-secondary);

    font-size: 11px;
    font-weight: 600;

    line-height: 1;
}

.calendar-grid .today {
    background: var(--primary-soft);

    box-shadow:
        inset 0 0 0 1px rgba(37, 99, 235, 0.18);
}

.calendar-grid .today .calendar-date {
    background: var(--primary);

    color: #ffffff;

    font-weight: 700;
}

.calendar-grid .selected {
    z-index: 2;

    background: var(--primary-soft);

    box-shadow:
        inset 0 0 0 2px var(--primary);
}

.calendar-grid .selected .calendar-date {
    background: var(--primary);

    color: #ffffff;

    font-weight: 700;
}

.calendar-grid .selected.today {
    background: var(--primary-soft);

    box-shadow:
        inset 0 0 0 2px var(--primary);
}

.calendar-grid .other-month {
    background: var(--surface-soft);
}

.calendar-grid .other-month .calendar-date {
    color: var(--muted);

    opacity: 0.6;
}

.calendar-grid .other-month .calendar-task {
    opacity: 0.55;
}


/* =========================================================
   31. CALENDAR TASK PREVIEW
   ========================================================= */

.calendar-grid .calendar-task {
    display: block;

    width: 100%;

    margin-top: 34px;

    padding: 5px 7px;

    overflow: hidden;

    border-radius: 5px;

    background: var(--primary-soft);

    color: var(--primary);

    font-size: 9px;
    font-weight: 600;

    line-height: 1.35;

    white-space: nowrap;

    text-overflow: ellipsis;

    cursor: pointer;

    transition:
        background var(--transition-fast),
        transform var(--transition-fast);
}

.calendar-grid .calendar-task:hover {
    background: var(--primary-border);

    transform: translateY(-1px);
}

.calendar-grid .calendar-task + .calendar-task {
    margin-top: 4px;
}

.calendar-grid .task-dot {
    display: inline-block;

    width: 5px;
    height: 5px;

    margin-right: 4px;

    border-radius: 50%;

    background: currentColor;

    vertical-align: middle;
}

.calendar-grid .task-dot.urgent {
    background: var(--red);
}

.calendar-grid .task-dot.important {
    background: var(--orange);
}

.calendar-grid .calendar-task.completed {
    background: var(--green-soft);

    color: var(--green);

    text-decoration: line-through;
}

.calendar-grid .calendar-more {
    display: block;

    margin-top: 5px;

    padding-left: 3px;

    color: var(--muted);

    font-size: 8px;
    font-weight: 600;

    white-space: nowrap;
}


/* =========================================================
   32. CALENDAR DETAIL SECTIONS
   ========================================================= */

.calendar-selected-section,
.calendar-upcoming-section,
.calendar-overdue-section {
    margin-top: 18px;

    padding: 20px;

    background: var(--surface);

    border: 1px solid var(--border);

    border-radius: var(--radius-md);

    box-shadow: var(--shadow-sm);
}

.calendar-section-heading {
    display: flex;
    align-items: center;
    justify-content: space-between;

    margin-bottom: 15px;
}

.calendar-section-heading .section-label {
    margin-bottom: 5px;
}

.calendar-section-heading h3 {
    margin: 0;

    color: var(--text);

    font-size: 15px;
    font-weight: 600;

    letter-spacing: -0.2px;
}

.calendar-day-tasks,
.upcoming-tasks,
.calendar-overdue-tasks {
    display: flex;
    flex-direction: column;

    gap: 8px;

    min-width: 0;
}


/* =========================================================
   33. CALENDAR TASK ITEMS
   ========================================================= */

.calendar-task-item {
    display: flex;
    align-items: center;

    gap: 12px;

    padding: 12px 14px;

    background: var(--surface-soft);

    border: 1px solid var(--border-light);

    border-radius: var(--radius-sm);

    transition:
        background var(--transition-fast),
        border-color var(--transition-fast),
        transform var(--transition-fast);
}

.calendar-task-item:hover {
    background: var(--surface);

    border-color: var(--border);

    transform: translateY(-1px);
}

.calendar-task-item.completed .calendar-task-title {
    color: var(--muted);

    text-decoration: line-through;
}

.calendar-task-check {
    width: 18px;
    height: 18px;

    flex-shrink: 0;

    display: flex;
    align-items: center;
    justify-content: center;

    border: 1.5px solid var(--border);

    border-radius: 50%;

    background: var(--surface);

    color: #ffffff;

    font-size: 10px;

    transition:
        background var(--transition-fast),
        border-color var(--transition-fast),
        transform var(--transition-fast);
}

.calendar-task-check:hover {
    border-color: var(--primary);

    transform: scale(1.06);
}

.calendar-task-check.checked {
    background: var(--green);

    border-color: var(--green);
}

.calendar-task-main {
    flex: 1;

    min-width: 0;
}

.calendar-task-title {
    margin-bottom: 3px;

    color: var(--text);

    font-size: 11px;
    font-weight: 600;

    line-height: 1.4;

    word-break: break-word;
}

.calendar-task-info {
    display: flex;
    align-items: center;

    flex-wrap: wrap;

    gap: 8px;

    color: var(--muted);

    font-size: 9px;
}

.calendar-task-priority.urgent {
    color: var(--red);

    font-weight: 600;
}

.calendar-task-priority.important {
    color: var(--orange);

    font-weight: 600;
}

.calendar-task-priority.normal {
    color: var(--muted);
}

.calendar-task-status {
    color: var(--text-secondary);

    font-weight: 500;
}

.calendar-task-actions {
    display: flex;
    align-items: center;

    gap: 4px;

    flex-shrink: 0;
}

.calendar-edit-btn,
.calendar-delete-btn {
    width: 28px;
    height: 28px;

    display: flex;
    align-items: center;
    justify-content: center;

    border-radius: 6px;

    background: transparent;

    color: var(--muted);

    font-size: 13px;

    transition:
        background var(--transition-fast),
        color var(--transition-fast);
}

.calendar-edit-btn:hover {
    background: var(--surface-hover);

    color: var(--text);
}

.calendar-delete-btn:hover {
    background: var(--red-soft);

    color: var(--red);
}

.calendar-empty {
    padding: 16px;

    text-align: center;

    color: var(--muted);

    font-size: 10px;
}

.calendar-upcoming-section {
    border-left: 3px solid var(--primary);
}

.calendar-overdue-section {
    border-left: 3px solid var(--red);
}


/* =========================================================
   34. DARK MODE COMPONENT OVERRIDES
   ========================================================= */

body.dark-mode .task-status.not-started {
    background: #1e293b;
    color: #94a3b8;
}

body.dark-mode .task-status.in-progress {
    background: rgba(59, 130, 246, 0.15);
    color: #60a5fa;
}

body.dark-mode .task-status.completed {
    background: rgba(5, 150, 105, 0.15);
    color: #34d399;
}

body.dark-mode .task-date-info {
    background: var(--surface-soft);

    border-color: #334155;

    color: #94a3b8;
}

body.dark-mode .task-date-info.error {
    background: rgba(220, 38, 38, 0.12);

    border-color: rgba(248, 113, 113, 0.3);

    color: #f87171;
}

body.dark-mode .calendar-grid .today {
    background: rgba(59, 130, 246, 0.10);

    box-shadow:
        inset 0 0 0 1px rgba(96, 165, 250, 0.25);
}

body.dark-mode .calendar-grid .selected {
    background: rgba(59, 130, 246, 0.13);

    box-shadow:
        inset 0 0 0 2px var(--primary);
}

body.dark-mode .calendar-grid .selected.today {
    background: rgba(59, 130, 246, 0.15);
}

body.dark-mode .calendar-grid .calendar-task {
    background: rgba(59, 130, 246, 0.13);

    color: #60a5fa;
}

body.dark-mode .calendar-grid .calendar-task.completed {
    background: rgba(5, 150, 105, 0.14);

    color: #34d399;
}

body.dark-mode .category.work {
    background: rgba(59, 130, 246, 0.14);
}

body.dark-mode .category.personal {
    background: rgba(22, 163, 74, 0.14);
}

body.dark-mode .category.study {
    background: rgba(124, 58, 237, 0.14);
}

body.dark-mode .category.others {
    background: rgba(217, 119, 6, 0.14);
}


/* =========================================================
   35. SCROLLBAR
   ========================================================= */

::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: var(--border);

    border-radius: 10px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--muted);
}


/* =========================================================
   36. TABLET
   ========================================================= */

@media (max-width: 1100px) {

    :root {
        --sidebar-width: 220px;
    }

    .content {
        padding: 30px 28px 50px;
    }

    .topbar {
        padding: 0 28px;
    }

    .stats {
        grid-template-columns:
            repeat(2, minmax(0, 1fr));
    }

    .task-toolbar {
        flex-wrap: wrap;
    }

    .filter-group {
        margin-left: 0;
    }

    .search-box {
        width: 220px;
    }
}


/* =========================================================
   37. SMALL TABLET
   ========================================================= */

@media (max-width: 900px) {

    .task-toolbar {
        align-items: stretch;
    }

    .search-box {
        flex: 1;

        width: auto;
    }

    .filter-group {
        width: 100%;
    }

    .filter-group select {
        flex: 1;

        min-width: 0;
    }

    .task-filter {
        width: fit-content;
    }

    .calendar-grid > * {
        min-height: 90px;
    }
}


/* =========================================================
   38. MOBILE
   ========================================================= */

@media (max-width: 800px) {

    :root {
        --sidebar-width: 0px;
    }

    .sidebar {
        width: 250px;

        transform: translateX(-100%);

        box-shadow:
            12px 0 35px rgba(15, 23, 42, 0.12);
    }

    .sidebar.open {
        transform: translateX(0);
    }

    .main {
        margin-left: 0;
    }

    .mobile-menu-btn {
        display: flex;
    }

    .breadcrumb {
        display: none;
    }

    .content {
        padding: 28px 22px 45px;
    }

    .topbar {
        padding: 0 22px;
    }

    .page-header {
        align-items: flex-start;

        flex-direction: column;

        gap: 20px;
    }

    .add-task-btn {
        width: 100%;
    }

    .task-toolbar {
        align-items: stretch;

        flex-direction: column;
    }

    .search-box {
        width: 100%;
    }

    .filter-group {
        width: 100%;
    }

    .filter-group select {
        flex: 1;

        min-width: 0;
    }

    .task-filter {
        width: 100%;
    }

    .filter-btn {
        flex: 1;
    }

    .task-actions {
        opacity: 1;
    }

    .calendar-header {
        align-items: flex-start;

        flex-direction: column;
    }

    .calendar-controls {
        width: 100%;

        justify-content: flex-start !important;
    }
}


/* =========================================================
   39. MOBILE — 560PX
   ========================================================= */

@media (max-width: 560px) {

    .topbar {
        height: 64px;

        padding: 0 16px;
    }

    .top-divider {
        display: none;
    }

    .top-actions {
        gap: 2px;
    }

    .content {
        padding: 24px 15px 40px;
    }

    .page-heading h1 {
        font-size: 23px;
    }

    .page-heading .date {
        font-size: 10px;
    }

    .stats {
        grid-template-columns:
            repeat(2, minmax(0, 1fr));

        gap: 10px;
    }

    .stat-card {
        min-height: 100px;

        padding: 15px;
    }

    .stat-label {
        font-size: 9px;
    }

    .stat-number {
        font-size: 22px;
    }

    .stat-icon {
        width: 34px;
        height: 34px;
    }

    .productivity-card {
        padding: 18px;
    }

    .progress-info {
        font-size: 9px;
    }

    .task-section {
        border-radius: 10px;
    }

    .section-header {
        padding: 19px 18px 16px;
    }

    .section-header h2 {
        font-size: 16px;
    }

    .task-toolbar {
        padding: 12px 18px;
    }

    .filter-group {
        display: grid;

        grid-template-columns:
            repeat(2, minmax(0, 1fr));
    }

    .filter-group select:last-child {
        grid-column: 1 / -1;
    }

    .task-item {
        padding: 14px 18px;

        gap: 10px;
    }

    .task-title {
        font-size: 11px;
    }

    .task-description {
        font-size: 9px;
    }

    .task-meta {
        gap: 5px;
    }

    .task-actions {
        opacity: 1;
    }

    .task-action {
        width: 28px;
        height: 28px;
    }

    .form-row {
        grid-template-columns: 1fr;
    }

    .modal {
        padding: 15px;
    }

    .modal-content {
        max-height: 92vh;

        padding: 20px;

        border-radius: 12px;
    }

    .modal-header {
        margin-bottom: 20px;
    }

    .calendar-title h2 {
        font-size: 18px;
    }

    .calendar-grid > * {
        min-height: 60px;

        padding: 4px;
    }

    .calendar-grid .calendar-date {
        width: 22px;
        height: 22px;

        font-size: 9px;
    }

    .calendar-grid .calendar-task {
        margin-top: 28px;

        padding: 4px;

        font-size: 8px;
    }

    .calendar-task-item {
        padding: 10px;

        gap: 8px;
    }

    .calendar-task-info {
        gap: 5px;

        font-size: 8px;
    }

    .calendar-task-actions {
        gap: 2px;
    }
}


/* =========================================================
   40. VERY SMALL MOBILE
   ========================================================= */

@media (max-width: 380px) {

    .stats {
        grid-template-columns: 1fr;
    }

    .avatar,
    .icon-btn {
        width: 32px;
        height: 32px;
    }

    .page-heading h1 {
        font-size: 21px;
    }

    .calendar-grid > * {
        min-height: 48px;
    }

    .calendar-grid .calendar-task {
        display: none;
    }

    .calendar-grid .calendar-more {
        display: none;
    }

    .calendar-grid .calendar-date {
        top: 5px;
        left: 5px;
    }

    .calendar-grid .calendar-weekday {
        min-height: 32px;

        font-size: 7px;
    }

    .calendar-btn {
        flex: 1;
    }
}


/* =========================================================
   41. REDUCED MOTION
   ========================================================= */

@media (prefers-reduced-motion: reduce) {

    *,
    *::before,
    *::after {
        scroll-behavior: auto !important;

        transition-duration: 0.01ms !important;

        animation-duration: 0.01ms !important;

        animation-iteration-count: 1 !important;
    }
}