:root {
    --charcoal: #2b2b2b;
    --charcoal-soft: #3a3a3a;
    --matte-grey: #6e6e6e;
    --matte-grey-light: #9a9a9a;
    --off-white: #f7f7f5;
    --surface: #fafaf8;
    --border: #e0e0e0;
    --field-height: 40px;
    --field-radius: 6px;
    --field-font-size: 0.875rem;
    --field-padding-x: 0.75rem;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    background-color: var(--off-white);
    color: var(--charcoal);
    font-family: "Segoe UI", -apple-system, BlinkMacSystemFont, sans-serif;
}

.page {
    max-width: 1040px;
    margin: 0 auto;
    padding: 3.25rem 1.5rem 4.5rem;
}

.app-title {
    font-size: 1.65rem;
    font-weight: 400;
    letter-spacing: 0.02em;
    color: var(--charcoal);
    margin: 0 0 2.5rem 0;
    line-height: 1.4;
}

.panel-title {
    font-size: 0.95rem;
    font-weight: 400;
    letter-spacing: 0.02em;
    color: var(--charcoal);
    margin: 0 0 1rem 0;
    padding-bottom: 0.55rem;
    border-bottom: 1px solid var(--border);
}

/* Tabs */
.tabs {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1.75rem;
    border-bottom: 1px solid var(--border);
}

.tab-btn {
    appearance: none;
    background: transparent;
    border: none;
    border-bottom: 2px solid transparent;
    padding: 0.65rem 0.25rem;
    margin-right: 1.5rem;
    font-size: 0.85rem;
    font-weight: 500;
    letter-spacing: 0.02em;
    color: var(--matte-grey);
    cursor: pointer;
}

.tab-btn.active {
    color: var(--charcoal);
    border-bottom-color: var(--charcoal);
}

.tab-panel {
    display: none;
}

.tab-panel.active {
    display: block;
}

/* Layout */
.columns {
    display: flex;
    gap: 2rem;
    align-items: flex-start;
    flex-wrap: wrap;
}

.col-form {
    flex: 1.05 1 320px;
    min-width: 320px;
}

.col-status {
    flex: 1 1 320px;
    min-width: 320px;
}

.panel {
    border: 1px solid var(--border);
    border-radius: var(--field-radius);
    background: var(--surface);
    padding: 1.75rem 1.5rem;
}

/* Fields */
.field-label {
    display: block;
    font-size: 0.74rem;
    font-weight: 500;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--matte-grey);
    margin-bottom: 0.45rem;
}

.field-input,
.field-select {
    box-sizing: border-box;
    width: 100%;
    height: var(--field-height);
    padding: 0 var(--field-padding-x);
    border: 1px solid var(--border);
    border-radius: var(--field-radius);
    background: #ffffff;
    color: var(--charcoal);
    font-size: var(--field-font-size);
    font-family: inherit;
    margin-bottom: 1.15rem;
    outline: none;
}

.field-input:focus,
.field-select:focus {
    border-color: var(--matte-grey);
}

.field-hidden {
    display: none;
}

.btn-submit {
    appearance: none;
    border-radius: var(--field-radius);
    border: 1px solid var(--charcoal-soft);
    background: var(--charcoal);
    color: #f5f5f3;
    font-size: 0.72rem;
    font-weight: 500;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    padding: 0.6rem 1.35rem;
    min-height: var(--field-height);
    cursor: pointer;
}

.btn-submit:hover {
    border-color: var(--charcoal);
    background: var(--charcoal-soft);
    color: #ffffff;
}

.btn-submit:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

/* Notices */
.notice-block {
    margin-bottom: 1.25rem;
    padding: 0.9rem 1rem;
    border: 1px solid var(--border);
    border-radius: var(--field-radius);
    background: #f0f0ee;
}

.notice-block.success {
    background: #ececea;
    border-left: 3px solid #5a5a5a;
}

.notice-block.error {
    background: #e8e8e6;
    border-left: 3px solid #4a4a4a;
}

.notice-label {
    display: block;
    font-size: 0.66rem;
    font-weight: 500;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--matte-grey);
    margin-bottom: 0.4rem;
}

.notice-text {
    font-size: 0.88rem;
    font-weight: 400;
    color: var(--charcoal);
    line-height: 1.65;
    margin: 0;
    white-space: pre-line;
}

/* Status badge */
.status-badge {
    display: flex;
    align-items: center;
    gap: 0.55rem;
    padding-bottom: 1rem;
    margin-bottom: 1rem;
    border-bottom: 1px solid var(--border);
}

.status-dot {
    width: 0.55rem;
    height: 0.55rem;
    border-radius: 50%;
    flex-shrink: 0;
}

.status-busy .status-dot {
    background: #a24a4a;
}

.status-free .status-dot {
    background: #4a8a5a;
}

.status-text {
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--charcoal);
    line-height: 1.5;
}

/* Reservation list */
.reservation-empty {
    font-size: 0.88rem;
    font-weight: 400;
    color: var(--matte-grey-light);
    line-height: 1.65;
    margin: 0;
}

.reservation-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.75rem;
    font-size: 0.88rem;
    font-weight: 400;
    color: var(--charcoal-soft);
    line-height: 1.75;
    margin: 0;
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--border);
}

.reservation-item:last-child {
    border-bottom: none;
    padding-bottom: 0;
}

.reservation-text {
    min-width: 0;
}

.reservation-name {
    color: var(--charcoal);
    font-weight: 500;
}

.reservation-period {
    color: var(--matte-grey);
    font-weight: 400;
}

.btn-cancel {
    appearance: none;
    flex-shrink: 0;
    border: 1px solid var(--border);
    border-radius: var(--field-radius);
    background: #ffffff;
    color: var(--matte-grey);
    font-size: 0.72rem;
    font-weight: 500;
    letter-spacing: 0.03em;
    padding: 0.35rem 0.7rem;
    cursor: pointer;
}

.btn-cancel:hover {
    border-color: #a24a4a;
    color: #a24a4a;
}

.btn-cancel:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* Equipment filter (calendar tab) */
.equipment-filter {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem 1rem;
    margin-bottom: 1.25rem;
}

.filter-chip {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    font-size: 0.8rem;
    color: var(--charcoal-soft);
    cursor: pointer;
}

.filter-chip input {
    accent-color: var(--charcoal);
}

.filter-chip-swatch {
    width: 0.75rem;
    height: 0.75rem;
    border-radius: 2px;
    border: 1px solid var(--border);
    flex-shrink: 0;
}

/* FullCalendar overrides */
#calendar {
    background: #ffffff;
    border: 1px solid var(--border);
    border-radius: var(--field-radius);
    padding: 0.75rem;
}

.fc {
    --fc-border-color: var(--border);
    --fc-page-bg-color: #ffffff;
    --fc-neutral-bg-color: #f7f7f5;
    --fc-today-bg-color: #f0f0ee;
    --fc-button-bg-color: #3a3a3a;
    --fc-button-border-color: #3a3a3a;
    --fc-button-hover-bg-color: #2b2b2b;
    --fc-button-hover-border-color: #2b2b2b;
    --fc-button-active-bg-color: #2b2b2b;
    --fc-button-active-border-color: #2b2b2b;
}

.fc .fc-toolbar-title {
    font-size: 1rem;
    font-weight: 500;
    color: var(--charcoal);
}

.fc .fc-col-header-cell-cushion,
.fc .fc-daygrid-day-number,
.fc .fc-list-day-text,
.fc .fc-list-day-side-text {
    color: var(--matte-grey);
    text-decoration: none;
}

a.fc-event,
a.fc-event:hover,
a.fc-event:focus,
a.fc-event:active {
    background: transparent !important;
    border: none !important;
    box-shadow: none !important;
    opacity: 1 !important;
    text-decoration: none !important;
    padding: 1px 2px !important;
}

.fc-event-main,
.fc-event-main-frame,
.fc-event-title-container {
    background: transparent !important;
}

.lab-event-chip {
    display: block;
    box-sizing: border-box;
    width: 100%;
    padding: 3px 6px;
    border-radius: 4px;
    color: #ffffff !important;
    font-size: 0.72rem;
    font-weight: 500;
    line-height: 1.35;
    white-space: normal;
    overflow: hidden;
}

.fc-list-event-dot {
    border-width: 6px !important;
}

.fc-list-event-title a {
    color: var(--charcoal) !important;
    text-decoration: none !important;
}

.fc-list-event-time {
    color: var(--matte-grey);
    font-variant-numeric: tabular-nums;
    white-space: nowrap;
}

/* Reuses the same name/period visual hierarchy as the 장비 예약 현황
   panel so the two lists read as one consistent system. */
.lab-list-name {
    color: var(--charcoal);
    font-weight: 500;
}

.lab-list-equipment {
    color: var(--matte-grey);
    font-weight: 400;
}