/* =====================================================================
   Calendar Manager — design system
   Semantic tokens live on :root / .dark; components only use tokens.
   ===================================================================== */

:root {
    --bg:            #f5f6f8;
    --surface:       #ffffff;
    --surface-2:     #f1f3f6;
    --surface-hover: #eceff3;
    --border:        #e2e5ea;
    --border-strong: #cfd4dc;

    --text:          #111827;
    --text-muted:    #5b6472;
    --text-subtle:   #8a93a1;

    --accent:        #0f766e;
    --accent-hover:  #115e59;
    --accent-soft:   #e3f5ef;
    --accent-text:   #115e59;
    --accent-brand:  #4bbfa1;
    --on-accent:     #ffffff;
    --ring:          rgba(20, 150, 125, .35);

    --success:       #15803d;
    --success-soft:  #ecfdf3;
    --danger:        #dc2626;
    --danger-hover:  #b91c1c;
    --danger-soft:   #fef2f2;
    --warning:       #b45309;
    --warning-soft:  #fffbeb;
    --info:          #2563eb;
    --info-soft:     #eff6ff;

    --sidebar-bg:    #ffffff;
    --shadow-sm:     0 1px 2px rgba(16, 24, 40, .05);
    --shadow-md:     0 1px 3px rgba(16, 24, 40, .06), 0 8px 24px -6px rgba(16, 24, 40, .08);
    --shadow-lg:     0 24px 48px -12px rgba(16, 24, 40, .25);

    --radius:        12px;
    --radius-sm:     8px;

    color-scheme: light;
}

.dark {
    --bg:            #0c0e13;
    --surface:       #14171e;
    --surface-2:     #1b1f28;
    --surface-hover: #222733;
    --border:        #262b36;
    --border-strong: #353b48;

    --text:          #e8eaef;
    --text-muted:    #a0a8b6;
    --text-subtle:   #6f7887;

    --accent:        #4bbfa1;
    --accent-hover:  #6fd3b9;
    --accent-soft:   rgba(75, 191, 161, .12);
    --accent-text:   #8fe0c9;
    --accent-brand:  #4bbfa1;
    --on-accent:     #08130f;
    --ring:          rgba(75, 191, 161, .4);

    --success:       #4ade80;
    --success-soft:  rgba(74, 222, 128, .1);
    --danger:        #f87171;
    --danger-hover:  #fca5a5;
    --danger-soft:   rgba(248, 113, 113, .1);
    --warning:       #fbbf24;
    --warning-soft:  rgba(251, 191, 36, .1);
    --info:          #60a5fa;
    --info-soft:     rgba(96, 165, 250, .1);

    --sidebar-bg:    #11141a;
    --shadow-sm:     0 1px 2px rgba(0, 0, 0, .3);
    --shadow-md:     0 1px 3px rgba(0, 0, 0, .3), 0 8px 24px -6px rgba(0, 0, 0, .4);
    --shadow-lg:     0 24px 48px -12px rgba(0, 0, 0, .6);

    color-scheme: dark;
}

/* ===== BASE ===== */
html { -webkit-text-size-adjust: 100%; }

body {
    background: var(--bg);
    color: var(--text);
    font-family: 'Inter', ui-sans-serif, system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
    font-feature-settings: 'cv11', 'ss01';
    -webkit-font-smoothing: antialiased;
}

::selection { background: var(--accent-soft); color: var(--accent-text); }

:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

.text-muted  { color: var(--text-muted); }
.text-subtle { color: var(--text-subtle); }
.text-accent { color: var(--accent); }
.text-danger { color: var(--danger); }
.text-success{ color: var(--success); }
.tabular     { font-variant-numeric: tabular-nums; }

.sr-only {
    position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
    overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0;
}

/* ===== APP SHELL ===== */
.sidebar {
    background: var(--sidebar-bg);
    border-right: 1px solid var(--border);
}

.topbar {
    background: color-mix(in srgb, var(--surface) 85%, transparent);
    backdrop-filter: saturate(180%) blur(12px);
    border-bottom: 1px solid var(--border);
}

.nav-section {
    font-size: .6875rem;
    font-weight: 600;
    letter-spacing: .06em;
    text-transform: uppercase;
    color: var(--text-subtle);
    padding: 0 .75rem;
    margin: 1.25rem 0 .375rem;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: .75rem;
    padding: .5rem .75rem;
    border-radius: var(--radius-sm);
    color: var(--text-muted);
    font-size: .875rem;
    font-weight: 500;
    text-decoration: none;
    transition: background-color .15s, color .15s;
}
.nav-link svg { flex-shrink: 0; opacity: .85; }
.nav-link:hover { background: var(--surface-hover); color: var(--text); }
.nav-link[aria-current="page"] {
    background: var(--accent-soft);
    color: var(--accent-text);
}
.nav-link[aria-current="page"] svg { opacity: 1; color: var(--accent); }
.nav-link .nav-ext { margin-left: auto; opacity: 0; transition: opacity .15s; }
.nav-link:hover .nav-ext { opacity: .6; }

/* ===== PAGE HEADER ===== */
.page-title {
    font-size: 1.625rem;
    line-height: 2rem;
    font-weight: 650;
    letter-spacing: -.02em;
    color: var(--text);
}
.page-subtitle { color: var(--text-muted); font-size: .9375rem; margin-top: .25rem; }

/* ===== CARD ===== */
.card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
}
.card-header {
    padding: 1rem 1.25rem;
    border-bottom: 1px solid var(--border);
}
.card-body   { padding: 1.25rem; }
.card-footer {
    padding: .875rem 1.25rem;
    border-top: 1px solid var(--border);
    background: var(--surface-2);
    border-radius: 0 0 var(--radius) var(--radius);
}
@media (min-width: 640px) {
    .card-header, .card-body, .card-footer { padding-left: 1.5rem; padding-right: 1.5rem; }
    .card-body { padding-top: 1.5rem; padding-bottom: 1.5rem; }
}

.section-title {
    font-size: .8125rem;
    font-weight: 600;
    color: var(--text);
    display: flex;
    align-items: center;
    gap: .5rem;
}
.section-hint { font-size: .8125rem; color: var(--text-muted); margin-top: .125rem; }

.divider { border: 0; border-top: 1px solid var(--border); margin: 0; }

/* ===== FORMS ===== */
.label {
    display: block;
    font-size: .8125rem;
    font-weight: 500;
    color: var(--text);
    margin-bottom: .375rem;
}
.label .req { color: var(--danger); margin-left: .125rem; }
.label .opt { color: var(--text-subtle); font-weight: 400; margin-left: .25rem; }

.input {
    width: 100%;
    min-height: 2.5rem;
    border: 1px solid var(--border-strong);
    border-radius: var(--radius-sm);
    padding: .5rem .75rem;
    font-size: .9375rem;
    line-height: 1.4;
    color: var(--text);
    background: var(--surface);
    box-shadow: var(--shadow-sm);
    transition: border-color .15s, box-shadow .15s;
}
.input::placeholder { color: var(--text-subtle); }
.input:hover { border-color: var(--text-subtle); }
.input:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--ring);
}
textarea.input { resize: vertical; min-height: 4.5rem; }
select.input {
    appearance: none;
    padding-right: 2.25rem;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%238a93a1' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='m6 9 6 6 6-6'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right .625rem center;
}
.input[type="datetime-local"] { font-variant-numeric: tabular-nums; }

/* Color swatch picker (radio group) */
.swatches { display: flex; flex-wrap: wrap; gap: .5rem; }
.swatch {
    position: relative;
    display: inline-flex;
    align-items: center;
    gap: .5rem;
    padding: .375rem .75rem .375rem .5rem;
    border: 1px solid var(--border);
    border-radius: 999px;
    font-size: .8125rem;
    color: var(--text-muted);
    background: var(--surface);
    cursor: pointer;
    user-select: none;
    transition: border-color .15s, background-color .15s, color .15s;
}
.swatch input { position: absolute; opacity: 0; pointer-events: none; }
.swatch:hover { border-color: var(--border-strong); color: var(--text); }
.swatch-dot {
    width: .875rem; height: .875rem; border-radius: 999px;
    box-shadow: inset 0 0 0 1px rgba(0, 0, 0, .12);
    flex-shrink: 0;
}
.swatch-dot.is-any {
    background: conic-gradient(#d50000, #f6bf26, #33b679, #039be5, #8e24aa, #d50000);
}
.swatch:has(input:checked) {
    border-color: var(--accent);
    background: var(--accent-soft);
    color: var(--accent-text);
    font-weight: 500;
}
.swatch:has(input:focus-visible) { box-shadow: 0 0 0 3px var(--ring); }

/* Toggle chips (checkbox group) */
.chips { display: flex; flex-wrap: wrap; gap: .5rem; }
.chip {
    display: inline-flex;
    align-items: center;
    gap: .5rem;
    padding: .4375rem .75rem;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    background: var(--surface);
    font-size: .8125rem;
    color: var(--text-muted);
    cursor: pointer;
    user-select: none;
    transition: border-color .15s, background-color .15s, color .15s;
}
.chip input { position: absolute; opacity: 0; pointer-events: none; }
.chip-box {
    width: 1rem; height: 1rem;
    border: 1.5px solid var(--border-strong);
    border-radius: 4px;
    display: grid; place-items: center;
    flex-shrink: 0;
    transition: background-color .15s, border-color .15s;
}
.chip-box svg { opacity: 0; color: var(--on-accent); }
.chip:hover { border-color: var(--border-strong); color: var(--text); }
.chip:has(input:checked) {
    border-color: var(--accent);
    background: var(--accent-soft);
    color: var(--accent-text);
}
.chip:has(input:checked) .chip-box { background: var(--accent); border-color: var(--accent); }
.chip:has(input:checked) .chip-box svg { opacity: 1; }
.chip:has(input:focus-visible) { box-shadow: 0 0 0 3px var(--ring); }

/* ===== BUTTONS ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: .5rem;
    min-height: 2.5rem;
    padding: .5rem 1rem;
    border-radius: var(--radius-sm);
    border: 1px solid transparent;
    font-size: .875rem;
    font-weight: 550;
    line-height: 1.25rem;
    white-space: nowrap;
    text-decoration: none;
    cursor: pointer;
    transition: background-color .15s, border-color .15s, color .15s, box-shadow .15s;
}
.btn:disabled, .btn[aria-disabled="true"] { opacity: .6; cursor: not-allowed; }
.btn svg { flex-shrink: 0; }

.btn-primary { background: var(--accent); color: var(--on-accent); box-shadow: var(--shadow-sm); }
.btn-primary:hover:not(:disabled) { background: var(--accent-hover); }

.btn-secondary {
    background: var(--surface);
    color: var(--text);
    border-color: var(--border-strong);
    box-shadow: var(--shadow-sm);
}
.btn-secondary:hover:not(:disabled) { background: var(--surface-hover); }

.btn-ghost { background: transparent; color: var(--text-muted); }
.btn-ghost:hover:not(:disabled) { background: var(--surface-hover); color: var(--text); }

.btn-danger { background: var(--danger); color: #fff; }
.btn-danger:hover:not(:disabled) { background: var(--danger-hover); }

.btn-sm { min-height: 2rem; padding: .3125rem .625rem; font-size: .8125rem; gap: .375rem; }
.btn-icon { padding: 0; width: 2.5rem; }
.btn-icon.btn-sm { width: 2rem; }
.btn-block { width: 100%; }

.spinner {
    width: 1rem; height: 1rem;
    border: 2px solid currentColor;
    border-right-color: transparent;
    border-radius: 999px;
    animation: spin .7s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ===== BADGES / ALERTS ===== */
.badge {
    display: inline-flex; align-items: center; gap: .25rem;
    padding: .125rem .5rem;
    border-radius: 999px;
    font-size: .75rem; font-weight: 500;
    background: var(--surface-2);
    color: var(--text-muted);
    border: 1px solid var(--border);
}
.badge-accent { background: var(--accent-soft); color: var(--accent-text); border-color: transparent; }

.alert {
    display: flex; gap: .75rem; align-items: flex-start;
    padding: .75rem 1rem;
    border-radius: var(--radius-sm);
    font-size: .875rem;
    border: 1px solid transparent;
}
.alert svg { flex-shrink: 0; margin-top: .125rem; }
.alert-warning { background: var(--warning-soft); color: var(--warning); border-color: color-mix(in srgb, var(--warning) 25%, transparent); }
.alert-danger  { background: var(--danger-soft);  color: var(--danger);  border-color: color-mix(in srgb, var(--danger) 25%, transparent); }
.alert-info    { background: var(--info-soft);    color: var(--info);    border-color: color-mix(in srgb, var(--info) 25%, transparent); }

/* ===== TABLE ===== */
.table { width: 100%; border-collapse: separate; border-spacing: 0; font-size: .875rem; }
.table th {
    position: sticky; top: 0; z-index: 1;
    background: var(--surface-2);
    color: var(--text-muted);
    font-size: .75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: .04em;
    text-align: left;
    padding: .625rem 1rem;
    border-bottom: 1px solid var(--border);
    white-space: nowrap;
}
.table td {
    padding: .625rem 1rem;
    border-bottom: 1px solid var(--border);
    color: var(--text);
    vertical-align: middle;
}
.table tbody tr:last-child td { border-bottom: 0; }
.table tbody tr:hover td { background: var(--surface-2); }
.table .num { text-align: right; font-variant-numeric: tabular-nums; white-space: nowrap; }
.table .nowrap { white-space: nowrap; }

.bar-track { height: 6px; border-radius: 999px; background: var(--surface-2); overflow: hidden; min-width: 4rem; }
.bar-fill  { height: 100%; border-radius: 999px; background: var(--accent); }

/* ===== STAT TILE ===== */
.stat-label { font-size: .8125rem; color: var(--text-muted); font-weight: 500; }
.stat-value { font-size: 1.625rem; font-weight: 650; letter-spacing: -.02em; margin-top: .25rem; font-variant-numeric: tabular-nums; }

/* ===== ACTION CARD (home) ===== */
.action-card {
    display: flex; flex-direction: column; gap: .75rem;
    padding: 1.25rem;
    text-decoration: none;
    color: inherit;
    transition: border-color .15s, box-shadow .15s, transform .15s;
}
.action-card:hover { border-color: var(--accent); box-shadow: var(--shadow-md); transform: translateY(-1px); }
.action-card .action-icon {
    width: 2.5rem; height: 2.5rem;
    display: grid; place-items: center;
    border-radius: 10px;
    background: var(--accent-soft);
    color: var(--accent);
}
.action-card .action-go { color: var(--text-subtle); transition: transform .15s, color .15s; }
.action-card:hover .action-go { color: var(--accent); transform: translateX(2px); }

/* ===== TOAST ===== */
.toast-region {
    position: fixed; z-index: 70;
    top: 1rem; right: 1rem; left: 1rem;
    display: flex; flex-direction: column; align-items: flex-end; gap: .5rem;
    pointer-events: none;
}
.toast {
    pointer-events: auto;
    width: 100%; max-width: 24rem;
    display: flex; align-items: flex-start; gap: .75rem;
    padding: .75rem .75rem .75rem 1rem;
    background: var(--surface);
    color: var(--text);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    box-shadow: var(--shadow-lg);
    font-size: .875rem;
    animation: toast-in .2s ease-out;
    transition: opacity .2s, transform .2s;
}
.toast.is-leaving { opacity: 0; transform: translateY(-4px); }
.toast-icon { flex-shrink: 0; margin-top: .0625rem; }
.toast-success .toast-icon { color: var(--success); }
.toast-error   .toast-icon { color: var(--danger); }
.toast-info    .toast-icon { color: var(--info); }
@keyframes toast-in { from { opacity: 0; transform: translateY(-6px); } }

/* ===== MODAL ===== */
.modal { position: fixed; inset: 0; z-index: 60; display: flex; align-items: center; justify-content: center; padding: 1rem; }
.modal[hidden] { display: none; }
.modal-backdrop { position: absolute; inset: 0; background: rgba(8, 10, 15, .55); backdrop-filter: blur(2px); opacity: 0; transition: opacity .2s; }
.modal-panel {
    position: relative;
    width: 100%;
    max-height: calc(100vh - 2rem);
    display: flex; flex-direction: column;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow-lg);
    opacity: 0; transform: translateY(8px) scale(.98);
    transition: opacity .2s, transform .2s;
}
.modal.is-open .modal-backdrop { opacity: 1; }
.modal.is-open .modal-panel { opacity: 1; transform: none; }
.modal-body { overflow-y: auto; }

/* Markdown help content */
.prose-help { font-size: .9rem; line-height: 1.6; color: var(--text-muted); }
.prose-help p { margin: 0 0 .75rem; }
.prose-help ul { list-style: disc; padding-left: 1.25rem; margin: 0 0 .75rem; }
.prose-help ul ul { list-style: circle; margin: .25rem 0; }
.prose-help li { margin: .25rem 0; }
.prose-help strong { color: var(--text); font-weight: 600; }
.prose-help code { background: var(--surface-2); padding: .1rem .3rem; border-radius: 4px; font-size: .85em; }

/* ===== DIFF ROWS (edit preview) ===== */
.diff-old { color: var(--text-subtle); text-decoration: line-through; text-decoration-color: color-mix(in srgb, var(--danger) 60%, transparent); }
.diff-new { color: var(--text); font-weight: 500; }

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after { animation-duration: .01ms !important; transition-duration: .01ms !important; }
}

/* Theme toggle icon swap */
.theme-icon-dark { display: none; }
.dark .theme-icon-dark { display: inline-flex; }
.dark .theme-icon-light { display: none; }
.theme-icon-light { display: inline-flex; }

/* ===== PAGE TRANSITIONS (cross-document view transitions, progressive) ===== */
@view-transition { navigation: auto; }
::view-transition-old(root), ::view-transition-new(root) { animation-duration: .18s; }
.sidebar { view-transition-name: sidebar; }
.topbar  { view-transition-name: topbar; }
::view-transition-old(sidebar), ::view-transition-new(sidebar),
::view-transition-old(topbar),  ::view-transition-new(topbar) { animation: none; }
main > div { animation: page-in .22s ease-out; }
@keyframes page-in { from { opacity: 0; transform: translateY(4px); } }

/* ===== DATE PRESETS ===== */
.presets { display: flex; flex-wrap: wrap; gap: .375rem; }
.preset {
    padding: .25rem .625rem;
    border-radius: 999px;
    border: 1px solid var(--border);
    background: var(--surface);
    color: var(--text-muted);
    font-size: .75rem;
    font-weight: 500;
    cursor: pointer;
    transition: border-color .15s, color .15s, background-color .15s;
}
.preset:hover { border-color: var(--border-strong); color: var(--text); }
.preset[aria-pressed="true"] { border-color: var(--accent); background: var(--accent-soft); color: var(--accent-text); }

/* ===== SORTABLE TABLES ===== */
.table th[data-sort] { cursor: pointer; user-select: none; }
.table th[data-sort]:hover { color: var(--text); }
.table th[data-sort] .sort-icon { display: inline-block; margin-left: .25rem; opacity: .35; transition: transform .15s, opacity .15s; vertical-align: -2px; }
.table th[aria-sort] .sort-icon { opacity: 1; color: var(--accent); }
.table th[aria-sort="descending"] .sort-icon { transform: rotate(180deg); }

/* ===== SKELETON ===== */
.skeleton {
    border-radius: 6px;
    background: linear-gradient(90deg, var(--surface-2) 25%, var(--surface-hover) 50%, var(--surface-2) 75%);
    background-size: 200% 100%;
    animation: shimmer 1.2s linear infinite;
}
@keyframes shimmer { to { background-position: -200% 0; } }

/* ===== EMPTY STATE ===== */
.empty-icon {
    width: 3rem; height: 3rem;
    display: grid; place-items: center;
    border-radius: 14px;
    background: var(--surface-2);
    color: var(--text-muted);
}