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

:root {
    /* Light theme defaults */
    --success-color: #10b981;
    --success-text-color: #ffffff;
    --danger-color: #ef4444;
    --danger-text-color: #ffffff;
    --modal-overlay: rgba(0, 0, 0, 0.5);
}

/* Dark theme overrides */
body.dark-theme {
    --success-color: #059669;
    --success-text-color: #ffffff;
    --danger-color: #dc2626;
    --danger-text-color: #ffffff;
    --modal-overlay: rgba(0, 0, 0, 0.7);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: var(--tg-theme-bg-color, #ffffff);
    color: var(--tg-theme-text-color, #000000);
    padding: 0;
    margin: 0;
    overflow-x: hidden;
    transition: background-color 0.3s ease, color 0.3s ease;
}

#app {
    max-width: 100vw;
    margin: 0 auto;
    padding: 0;
}

/* Navigation tabs */
.tabs {
    display: flex;
    justify-content: space-around;
    background: var(--tg-theme-secondary-bg-color, #f4f4f5);
    border-bottom: 1px solid var(--tg-theme-hint-color, #999);
    position: sticky;
    top: 0;
    z-index: 100;
}

.tab {
    flex: 1;
    padding: 12px;
    background: none;
    border: none;
    font-size: 14px;
    cursor: pointer;
    transition: background 0.2s;
    color: var(--tg-theme-text-color, #000);
}

.tab.active {
    background: var(--tg-theme-bg-color, #fff);
    border-bottom: 2px solid var(--tg-theme-button-color, #3390ec);
}

/* Views */
.view {
    display: none;
    padding: 16px;
}

.view.active {
    display: block;
}

/* Calendar */
.month-selector {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
}

.month-selector button {
    padding: 8px 16px;
    background: var(--tg-theme-button-color, #3390ec);
    color: var(--tg-theme-button-text-color, #fff);
    border: none;
    border-radius: 8px;
    font-size: 18px;
    cursor: pointer;
}

#current-month {
    font-size: 18px;
    font-weight: 600;
}

#calendar-grid {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 4px;
}

.calendar-day {
    aspect-ratio: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background: var(--tg-theme-secondary-bg-color, #f4f4f5);
    border-radius: 8px;
    cursor: pointer;
    transition: opacity 0.2s;
    padding: 4px;
    font-size: 14px;
    touch-action: manipulation;
}

.calendar-day:active {
    opacity: 0.7;
}

.calendar-day.today {
    background: var(--tg-theme-button-color, #3390ec);
    color: var(--tg-theme-button-text-color, #fff);
    font-weight: bold;
}

.calendar-day.has-shift {
    background: var(--success-color);
    color: var(--success-text-color);
}

.calendar-day.other-month {
    opacity: 0.3;
}

.shift-indicator {
    font-size: 10px;
    margin-top: 2px;
}

/* Modal */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--modal-overlay);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.modal.hidden {
    display: none;
}

.modal-content {
    background: var(--tg-theme-bg-color, #fff);
    padding: 24px;
    border-radius: 12px;
    width: 90%;
    max-width: 400px;
}

.modal-content h3 {
    margin-bottom: 16px;
}

#shift-form input,
#shift-form textarea {
    width: 100%;
    padding: 12px;
    margin-bottom: 12px;
    border: 1px solid var(--tg-theme-hint-color, #999);
    border-radius: 8px;
    font-size: 16px;
    background: var(--tg-theme-bg-color, #fff);
    color: var(--tg-theme-text-color, #000);
}

#shift-form textarea {
    resize: vertical;
    min-height: 80px;
}

.form-actions {
    display: flex;
    gap: 8px;
    margin-top: 16px;
}

.btn-primary,
.btn-secondary,
.btn-danger {
    flex: 1;
    padding: 12px;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    cursor: pointer;
    transition: opacity 0.2s;
}

.btn-primary {
    background: var(--tg-theme-button-color, #3390ec);
    color: var(--tg-theme-button-text-color, #fff);
}

.btn-secondary {
    background: var(--tg-theme-secondary-bg-color, #f4f4f5);
    color: var(--tg-theme-text-color, #000);
}

.btn-danger {
    background: var(--danger-color);
    color: var(--danger-text-color);
}

.btn-primary:active,
.btn-secondary:active,
.btn-danger:active {
    opacity: 0.7;
}

/* Calendar actions */
.calendar-actions {
    display: flex;
    gap: 8px;
    margin: 16px auto;
    max-width: 600px;
    padding: 0 8px;
}

/* Export button */
.btn-export {
    flex: 1;
    padding: 12px 16px;
    background: var(--success-color);
    color: var(--success-text-color);
    border: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    text-align: center;
    transition: opacity 0.2s;
}

.btn-export:active {
    opacity: 0.8;
}

/* Copy button */
.btn-copy {
    flex: 1;
    padding: 12px 16px;
    background: var(--tg-theme-button-color, #3390ec);
    color: var(--tg-theme-button-text-color, #fff);
    border: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    text-align: center;
    transition: opacity 0.2s;
}

.btn-copy:active {
    opacity: 0.8;
}

/* Delete shift button (in group roster) */
.btn-delete-shift {
    position: absolute;
    top: 8px;
    right: 8px;
    background: var(--danger-color);
    color: var(--danger-text-color);
    border: none;
    border-radius: 4px;
    padding: 4px 8px;
    font-size: 16px;
    cursor: pointer;
    transition: opacity 0.2s;
}

.btn-delete-shift:active {
    opacity: 0.7;
}

/* Statistics */
.stats-period {
    display: flex;
    gap: 8px;
    margin-bottom: 16px;
}

.period-btn {
    flex: 1;
    padding: 12px;
    background: var(--tg-theme-secondary-bg-color, #f4f4f5);
    border: none;
    border-radius: 8px;
    cursor: pointer;
    color: var(--tg-theme-text-color, #000);
}

.period-btn.active {
    background: var(--tg-theme-button-color, #3390ec);
    color: var(--tg-theme-button-text-color, #fff);
}

.stats-cards {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
    margin-bottom: 24px;
}

.stat-card {
    background: var(--tg-theme-secondary-bg-color, #f4f4f5);
    padding: 16px;
    border-radius: 12px;
    text-align: center;
}

.stat-card h3 {
    font-size: 12px;
    color: var(--tg-theme-hint-color, #999);
    margin-bottom: 8px;
}

.stat-value {
    font-size: 24px;
    font-weight: bold;
    color: var(--tg-theme-button-color, #3390ec);
}

#hours-chart {
    width: 100%;
    height: 250px;
}

/* Group view */
#group-list,
#group-roster {
    margin-top: 16px;
}

.group-item {
    background: var(--tg-theme-secondary-bg-color, #f4f4f5);
    padding: 16px;
    border-radius: 12px;
    margin-bottom: 12px;
    cursor: pointer;
}

.group-item:active {
    opacity: 0.7;
}

/* Loading */
#loading {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--modal-overlay);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 2000;
}

#loading.hidden {
    display: none;
}

.spinner {
    width: 48px;
    height: 48px;
    border: 4px solid var(--tg-theme-hint-color, #999);
    border-top-color: var(--tg-theme-button-color, #3390ec);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

/* Admin controls */
#admin-controls {
    margin: 16px 0;
    padding: 12px;
    background: var(--tg-theme-secondary-bg-color, #f4f4f5);
    border-radius: 8px;
}

#admin-controls.hidden {
    display: none;
}

#add-group-shift-btn {
    width: 100%;
    padding: 12px;
    font-size: 16px;
    font-weight: 500;
}

#back-to-groups {
    margin-bottom: 12px;
}

/* Members checkboxes */
.members-checkboxes {
    max-height: 300px;
    overflow-y: auto;
    padding: 8px 0;
}

.member-checkbox {
    padding: 8px 0;
}

.member-checkbox label {
    display: flex;
    align-items: center;
    cursor: pointer;
    padding: 8px;
    border-radius: 6px;
    transition: background 0.2s;
}

.member-checkbox label:hover {
    background: var(--tg-theme-secondary-bg-color, #f4f4f5);
}

.member-checkbox input[type="checkbox"] {
    margin-right: 12px;
    width: 20px;
    height: 20px;
    cursor: pointer;
}

/* Group roster styles */
#group-roster {
    padding: 16px;
}

#group-roster.hidden {
    display: none;
}

#roster-calendar {
    margin-top: 16px;
}

/* Settings view styles */
.settings-section {
    background: var(--tg-theme-secondary-bg-color, #f4f4f5);
    border-radius: 12px;
    padding: 16px;
    margin-bottom: 16px;
}

.settings-section h3 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--tg-theme-text-color, #000);
}

.setting-item {
    margin-bottom: 12px;
}

.setting-item:last-child {
    margin-bottom: 0;
}

.setting-item label {
    display: block;
    font-size: 14px;
    margin-bottom: 6px;
    color: var(--tg-theme-text-color, #000);
}

.setting-item input[type="checkbox"] {
    margin-right: 8px;
    width: 18px;
    height: 18px;
    cursor: pointer;
}

.setting-item input[type="number"],
.setting-item select {
    width: 100%;
    padding: 10px;
    border: 1px solid var(--tg-theme-hint-color, #999);
    border-radius: 8px;
    background: var(--tg-theme-bg-color, #fff);
    color: var(--tg-theme-text-color, #000);
    font-size: 14px;
    font-family: inherit;
}

#reminder-hours-group {
    margin-top: 12px;
}

#save-settings-btn {
    width: 100%;
    margin-top: 16px;
}

/* Copy and delete mode styles */
.calendar-day.source-date {
    background: #8b5cf6 !important;
    color: white !important;
    font-weight: bold;
    border: 3px solid #6d28d9;
}

.calendar-day.target-date {
    background: #f59e0b !important;
    color: white !important;
    font-weight: bold;
    border: 3px solid #d97706;
}

#copy-mode-indicator {
    background: var(--tg-theme-secondary-bg-color, #f4f4f5);
    padding: 12px;
    border-radius: 8px;
    margin-bottom: 12px;
    text-align: center;
    font-weight: 600;
    color: var(--tg-theme-text-color, #000);
}

.calendar-actions {
    display: flex;
    gap: 8px;
    margin-bottom: 12px;
    flex-wrap: wrap;
}

.btn-copy, .btn-delete {
    flex: 1;
    min-width: 140px;
    padding: 8px 12px;
    border: none;
    border-radius: 8px;
    font-size: 13px;
    cursor: pointer;
    transition: opacity 0.2s;
    touch-action: manipulation;
}

.btn-copy {
    background: var(--tg-theme-button-color, #3390ec);
    color: var(--tg-theme-button-text-color, #fff);
}

.btn-delete {
    background: var(--danger-color, #ef4444);
    color: var(--danger-text-color, #fff);
}

.btn-copy:active, .btn-delete:active {
    opacity: 0.7;
}