:root {
    color-scheme: light;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    --bg-page: #f3f4f6;
    --text-main: #1f2937;
    --text-muted: #6b7280;
    --surface: #ffffff;
    --surface-strong: #f9fafb;
    --border: #d1d5db;
    --card-border: #e5e7eb;
    --toolbar-bg: #ffffff;
    --input-bg: #ffffff;
    --primary: #0078d4;
    --primary-hover: #106ebe;
    --secondary: #0f766e;
    --secondary-hover: #115e59;
    --success: #10b981;
    --success-hover: #0f766e;
    --danger: #ef4444;
    --danger-hover: #dc2626;
    --warning: #f59e0b;
    --warning-hover: #d97706;
    --day-bg: #ffffff;
    --day-hover: #f3f4f6;
    --today-border: #0078d4;
}

* {
    box-sizing: border-box;
}

html, body {
    margin: 0;
    padding: 0;
    min-height: 100%;
    background: var(--bg-page);
}

body {
    line-height: 1.5;
    font-size: 15px;
    color: var(--text-main);
}

button, label {
    font: inherit;
}

button {
    border: none;
    cursor: pointer;
    border-radius: 4px;
    transition: background 0.2s ease, transform 0.2s ease, box-shadow 0.2s ease;
    color: #ffffff;
    background: var(--primary);
}

button:hover,
label:hover {
    transform: translateY(-1px);
}

button:disabled {
    cursor: not-allowed;
    opacity: 0.6;
    transform: none;
}

.site-header {
    padding: 24px 20px 10px;
    text-align: center;
}

.site-header h1 {
    margin: 0;
    font-size: 24px;
    color: #111827;
}

.app-shell {
    display: grid;
    grid-template-columns: 1.5fr 1fr;
    gap: 20px;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px 30px;
}

.toolbar {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 12px;
    padding: 16px;
    background: #ffffff;
    border: 1px solid #d1d5db;
    border-radius: 8px;
}

.toolbar-main {
    margin: 0 20px 20px;
}

.toolbar-secondary {
    flex-direction: column;
    align-items: stretch;
}

.toolbar-secondary button,
#export-data,
#import-label {
    width: 100%;
    text-align: center;
}

#draw-button {
    min-width: 168px;
    padding: 14px 18px;
    background: var(--primary);
    color: #ffffff;
    font-weight: 600;
}

#draw-button:hover {
    background: var(--primary-hover);
}

#clear-assignments {
    min-width: 168px;
    padding: 14px 18px;
    background: var(--warning);
    color: #111827;
    font-weight: 600;
}

#clear-assignments:hover {
    background: var(--warning-hover);
}

#export-data,
#import-label {
    background: var(--secondary);
    color: #ffffff;
}

#export-data:hover,
#import-label:hover {
    background: var(--secondary-hover);
}

#add-person {
    background: var(--success);
    color: #ffffff;
}

#add-person:hover {
    background: var(--success-hover);
}

#remove-person {
    background: var(--danger);
    color: #ffffff;
}

#remove-person:hover {
    background: var(--danger-hover);
}

#reset-data {
    background: var(--border);
    color: #ffffff;
}

#reset-data:hover {
    background: #9ca3af;
}

.calendar-panel,
.side-panel {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 18px;
}

.calendar-panel {
    min-height: 640px;
}

.stats-panel {
    padding: 16px;
    background: var(--surface-strong);
    border: 1px solid var(--card-border);
    border-radius: 8px;
    margin-bottom: 16px;
    color: var(--text-main);
    font-weight: 600;
}

.people-section {
    display: grid;
    gap: 16px;
}

.list-card {
    background: var(--surface);
    border: 1px solid var(--card-border);
    border-radius: 8px;
    padding: 16px;
}

.list-card h2 {
    margin: 0 0 10px;
    font-size: 16px;
    color: #111827;
}

.list-card ul {
    list-style: none;
    margin: 0;
    padding: 0;
    display: grid;
    gap: 10px;
}

.list-card li {
    padding: 10px 12px;
    border: 1px solid #e5e7eb;
    border-radius: 6px;
    background: #f9fafb;
    color: #111827;
    cursor: pointer;
}

.list-card li:hover,
.list-card li:focus {
    background: #eef2ff;
    outline: none;
}

#calendar {
    display: grid;
    gap: 18px;
}

.month {
    border: 1px solid var(--card-border);
    border-radius: 8px;
    overflow: hidden;
}
.setting-field {
    display: grid;
    gap: 8px;
    margin-bottom: 14px;
}

.setting-field label {
    font-size: 0.95rem;
    color: var(--text-main);
}

.setting-field select {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid var(--card-border);
    border-radius: 6px;
    background: var(--input-bg);
    color: var(--text-main);
}

.custom-colors {
    margin-top: 10px;
}

.custom-colors .setting-field {
    margin-bottom: 10px;
}

.custom-colors input[type="color"] {
    width: 50px;
    height: 40px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
}

body.layout-standard .app-shell {
    grid-template-columns: 1.5fr 1fr;
}

body.layout-compact .app-shell {
    grid-template-columns: 1fr;
    gap: 12px;
}

body.layout-compact .calendar-panel {
    min-height: 520px;
}

body.layout-compact .day-card {
    min-height: 60px;
    padding: 6px 4px;
}

body.layout-spacious .app-shell {
    grid-template-columns: 2fr 1fr;
    gap: 24px;
}

body.layout-spacious .toolbar,
body.layout-spacious .list-card,
body.layout-spacious .calendar-panel,
body.layout-spacious .side-panel {
    padding: 24px;
}
.month-header {
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 14px 0;
    background: #f3f4f6;
    color: #111827;
    font-size: 16px;
    font-weight: 700;
}

.week-days,
.calendar-grid {
    display: grid;
    grid-template-columns: repeat(7, minmax(0, 1fr));
}

.week-day,
.day-card,
.empty-card {
    border: 1px solid var(--card-border);
    border-radius: 6px;
    min-height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 8px 6px;
    background: var(--day-bg);
    color: var(--text-main);
}

.week-day {
    background: #f8fafc;
    color: var(--text-muted);
    font-size: 12px;
    font-weight: 600;
}

.empty-card {
    background: transparent;
    border-color: transparent;
}

.day-card {
    cursor: pointer;
    transition: background 0.16s ease, border-color 0.16s ease;
    text-align: center;
    flex-direction: column;
    justify-content: center;
    min-height: 72px;
    background: var(--day-bg);
}

.day-card:hover,
.day-card:focus {
    background: #f3f4f6;
    outline: none;
}

.day-card.selected {
    background: var(--primary);
    color: #ffffff;
    border-color: var(--primary);
}

.day-card.assigned {
    background: var(--success);
    color: #ffffff;
    border-color: var(--success);
}

.day-card.today {
    border: 2px solid var(--today-border);
}

.day-card.prev-month {
    opacity: 0.6;
    background: var(--surface-strong);
}

.day-number {
    font-size: 16px;
    font-weight: 700;
}

.assigned-name {
    margin-top: 6px;
    padding: 4px 8px;
    border-radius: 999px;
    background: rgba(255,255,255,0.16);
    color: inherit;
    font-size: 12px;
    max-width: 100%;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.toast {
    position: fixed;
    bottom: 18px;
    left: 50%;
    transform: translateX(-50%);
    min-width: 240px;
    max-width: 340px;
    padding: 12px 16px;
    border-radius: 10px;
    background: rgba(17,24,39,0.95);
    color: #ffffff;
    box-shadow: 0 16px 40px rgba(15,23,42,0.24);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.2s ease, transform 0.2s ease;
}

.toast.visible {
    opacity: 1;
    transform: translateX(-50%) translateY(-4px);
}

.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;
}

@media (max-width: 960px) {
    .app-shell {
        grid-template-columns: 1fr;
    }

    .toolbar-secondary {
        flex-direction: column;
    }
}

@media (max-width: 640px) {
    body {
        padding: 0;
    }

    .site-header,
    .toolbar,
    .app-shell,
    .calendar-panel,
    .side-panel {
        padding-left: 12px;
        padding-right: 12px;
    }
}