:root {
    --bg: #ffffff;
    --surface: #fbfbfa;
    --border: #e7e5e0;
    --border-strong: #d8d5cf;
    --ink: #16151a;
    --ink-mute: #5d5b58;
    --ink-soft: #8a8884;

    --accent: #1d6e4f;
    --accent-soft: rgba(29, 110, 79, 0.1);
    --accent-soft-strong: rgba(29, 110, 79, 0.18);
    --accent-ink: #ffffff;

    --heat: 58, 58, 68; /* rgb tuple, used with varying alpha */
    --ok-soft: #e5f0eb;

    --font-sans:
        ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui,
        sans-serif;
    --font-mono: ui-monospace, "SF Mono", Menlo, monospace;
}

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

body {
    font-family: var(--font-sans);
    color: var(--ink);
    background: var(--bg);
    max-width: 1180px;
    margin: 0 auto;
    padding: 1.4rem 1.6rem 2rem;
    font-size: 14px;
    line-height: 1.45;
}

main > * + * {
    margin-top: 1.1rem;
}

input,
button {
    font-family: inherit;
    font-size: inherit;
    color: inherit;
}
input:focus,
button:focus {
    outline: none;
}

h1 {
    font-size: 1.6rem;
    font-weight: 600;
    letter-spacing: -0.3px;
}

/* ----------------------------------------------------------------------
   Home link / index page
---------------------------------------------------------------------- */
.home-link {
    font-size: 0.8rem;
    margin-bottom: 0.4rem;
}
.home-link a {
    color: var(--ink-soft);
    text-decoration: none;
}
.home-link a:hover {
    color: var(--ink);
}

/* ----------------------------------------------------------------------
   Index page
---------------------------------------------------------------------- */
form {
    display: flex;
    gap: 0.5rem;
}
form input {
    flex: 1;
    padding: 0.55rem 0.75rem;
    font-size: 1rem;
    border: 1px solid var(--border-strong);
    border-radius: 8px;
    background: #fff;
}
form button {
    padding: 0.55rem 1rem;
    font-size: 1rem;
    border-radius: 8px;
    background: var(--accent);
    color: #fff;
    border: none;
    font-weight: 600;
    cursor: pointer;
}
form button:hover {
    background: #195e44;
}

/* ----------------------------------------------------------------------
   Meeting header
---------------------------------------------------------------------- */
.meeting-head {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 1.4rem;
}
.meeting-head-main {
    min-width: 0;
    flex: 1;
}

.meeting-title-row {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
}

/* chosen-time chip sits beside the meeting name */
.chosen-chip {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 4px 6px 4px 12px;
    border-radius: 999px;
    background: var(--accent-soft);
    color: var(--accent);
    border: 1px solid var(--accent);
    font-size: 13px;
    font-weight: 600;
}
.chosen-chip-clear {
    width: 18px;
    height: 18px;
    border-radius: 9px;
    background: transparent;
    border: none;
    color: var(--accent);
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
    line-height: 1;
    padding: 0;
}
.chosen-chip-clear:hover {
    background: var(--accent);
    color: #fff;
}

/* share-link button */
.share {
    flex-shrink: 0;
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 6px 6px 6px 12px;
    border-radius: 8px;
    border: 1px solid var(--border);
    background: var(--surface);
}
.share input {
    border: none;
    background: transparent;
    font-family: var(--font-mono);
    font-size: 12px;
    color: var(--ink-mute);
    width: auto;
    padding: 2px 0;
}
.share button {
    padding: 4px 10px;
    border-radius: 5px;
    background: #ececea;
    color: var(--ink);
    border: none;
    font-size: 11px;
    font-weight: 600;
    cursor: pointer;
}
.share button:hover {
    background: #dededc;
}

/* ----------------------------------------------------------------------
   Identity row
---------------------------------------------------------------------- */
.identity {
    display: flex;
    align-items: center;
    gap: 14px;
    flex-wrap: wrap;
    padding: 10px 14px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 10px;
}
.identity label {
    font-size: 12px;
    font-weight: 600;
    color: var(--ink-mute);
    letter-spacing: 0.3px;
}
.identity input {
    padding: 6px 10px;
    font-size: 14px;
    border: 1px solid var(--border-strong);
    border-radius: 7px;
    background: #fff;
    min-width: 12rem;
    max-width: 18rem;
}
.identity-existing {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 8px;
    font-size: 12px;
    color: var(--ink-mute);
}
.identity-existing[hidden] {
    display: none;
}
.identity-existing-label {
    color: var(--ink-mute);
}
.chips {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}
.chip {
    padding: 4px 10px;
    background: #fff;
    border: 1px solid var(--border);
    border-radius: 999px;
    font-size: 12px;
    color: var(--ink);
    cursor: pointer;
}
.chip:hover {
    background: var(--surface);
    border-color: var(--border-strong);
}
.chip-active {
    background: var(--accent);
    color: #fff;
    border-color: var(--accent);
}
.chip-active:hover {
    background: #195e44;
    border-color: #195e44;
}

/* ----------------------------------------------------------------------
   Week nav
---------------------------------------------------------------------- */
.week-nav-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 18px;
}
.week-nav {
    display: flex;
    gap: 0.9rem;
    justify-content: center;
    font-size: 12.5px;
}
.week-nav a {
    color: var(--ink-mute);
    text-decoration: none;
    padding: 4px 8px;
    border-radius: 6px;
}
.week-nav a:hover {
    color: var(--ink);
    background: var(--surface);
}

/* ----------------------------------------------------------------------
   Grids — side-by-side
---------------------------------------------------------------------- */
.grids {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 18px;
    align-items: flex-start;
}
.grid-section {
    display: flex;
    flex-direction: column;
    min-width: 0;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 12px;
    transition:
        border-color 0.18s,
        box-shadow 0.18s;
}
.grid-section.pick-mode {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-soft);
}
.grid-section-head {
    padding: 12px 16px;
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
}
.grid-section-title {
    min-width: 0;
}
.grid-section-name {
    font-size: 13.5px;
    font-weight: 600;
}
.grid-section-sub {
    font-size: 11.5px;
    color: var(--ink-soft);
}
.grid-container {
    padding: 12px;
    overflow-x: auto;
}

/* pick-a-time button (right grid only) */
.pick-btn {
    flex-shrink: 0;
    display: inline-flex;
    align-items: center;
    gap: 5px;
    padding: 5px 10px;
    border-radius: 7px;
    border: 1px solid var(--border-strong);
    background: transparent;
    font-size: 12px;
    font-weight: 600;
    color: var(--ink-mute);
    cursor: pointer;
}
.pick-btn:disabled {
    cursor: not-allowed;
    opacity: 0.5;
}
.pick-btn:not(:disabled):hover {
    background: var(--surface);
    color: var(--ink);
}
.pick-btn.active {
    background: var(--accent);
    color: #fff;
    border-color: var(--accent);
}
.pick-btn.active:hover {
    background: #195e44;
}
.pick-btn-icon {
    font-size: 11px;
}

/* ----------------------------------------------------------------------
   Grid table
---------------------------------------------------------------------- */
.grid {
    border-collapse: separate;
    border-spacing: 0;
    user-select: none;
    width: 100%;
    table-layout: fixed;
}
.grid th {
    padding: 4px 0 8px;
    font-weight: 500;
    font-size: 11px;
    color: var(--ink-mute);
    text-align: center;
}
.grid th .th-day {
    display: block;
    font-weight: 600;
    color: var(--ink);
    font-size: 12px;
}
.grid th .th-date {
    display: block;
    font-size: 12px;
    color: var(--ink-soft);
}
.grid th.th-corner {
    text-align: right;
    padding-right: 6px;
    font-size: 12px;
    color: var(--ink-soft);
    text-transform: uppercase;
    letter-spacing: 0.4px;
    font-weight: 500;
}
.grid .hour-label {
    width: 38px;
    font-size: 12px;
    color: var(--ink-soft);
    text-align: right;
    padding-right: 6px;
    vertical-align: top;
    position: relative;
    top: -5px;
}
.slot {
    padding: 0;
    height: 22px;
    border-top: 1px solid var(--border);
    border-left: 1px solid var(--border);
    cursor: pointer;
}
.slot-inner {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.1s;
}
.count {
    font-size: 11px;
    font-weight: 600;
}

/* ----------------------------------------------------------------------
   Left grid — your availability
---------------------------------------------------------------------- */
.grid-mine .slot:hover .slot-inner {
    background: var(--accent-soft-strong);
}
.grid-mine .slot.mine .slot-inner {
    background: var(--accent);
    border: 1px solid var(--accent);
}
.grid-mine .slot.mine:hover .slot-inner {
    background: #195e44;
}

/* ----------------------------------------------------------------------
   Right grid — chosen (outline only; heatmap stays visible underneath)
---------------------------------------------------------------------- */
.grid-all .slot[data-chosen] .slot-inner {
    box-shadow:
        inset 2px 0 0 0 var(--accent),
        inset -2px 0 0 0 var(--accent);
}
.grid-all .slot[data-chosen="single"] .slot-inner {
    box-shadow: inset 0 0 0 2px var(--accent);
}
.grid-all .slot[data-chosen="first"] .slot-inner {
    box-shadow:
        inset 2px 0 0 0 var(--accent),
        inset -2px 0 0 0 var(--accent),
        inset 0 2px 0 0 var(--accent);
}
.grid-all .slot[data-chosen="last"] .slot-inner {
    box-shadow:
        inset 2px 0 0 0 var(--accent),
        inset -2px 0 0 0 var(--accent),
        inset 0 -2px 0 0 var(--accent);
}

/* right-grid: not interactive unless pick-mode is on */
.grid-section:not(.pick-mode) .grid-all .slot {
    cursor: default;
}
.grid-section.pick-mode .grid-all .slot {
    cursor: crosshair;
}

/* dragging-to-pick preview — same outline pattern as chosen */
.grid-all .slot.choosing .slot-inner {
    box-shadow:
        inset 2px 0 0 0 var(--accent),
        inset -2px 0 0 0 var(--accent);
}
.grid-all .slot.choosing-single .slot-inner {
    box-shadow: inset 0 0 0 2px var(--accent);
}
.grid-all .slot.choosing-first .slot-inner {
    box-shadow:
        inset 2px 0 0 0 var(--accent),
        inset -2px 0 0 0 var(--accent),
        inset 0 2px 0 0 var(--accent);
}
.grid-all .slot.choosing-last .slot-inner {
    box-shadow:
        inset 2px 0 0 0 var(--accent),
        inset -2px 0 0 0 var(--accent),
        inset 0 -2px 0 0 var(--accent);
}

/* ----------------------------------------------------------------------
   Tooltip
---------------------------------------------------------------------- */
.tooltip {
    position: fixed;
    transform: translate(-50%, -100%);
    background: #16151a;
    color: #fff;
    padding: 4px 8px;
    border-radius: 5px;
    font-size: 11.5px;
    pointer-events: none;
    white-space: nowrap;
    z-index: 10;
}

/* ----------------------------------------------------------------------
   Narrower viewports — stack the grids
---------------------------------------------------------------------- */
@media (max-width: 900px) {
    .grids {
        grid-template-columns: 1fr;
    }
    .week-nav-row {
        grid-template-columns: 1fr;
    }
    .meeting-head {
        flex-direction: column;
    }
    .share {
        width: 100%;
    }
    .share input {
        flex: 1;
        min-width: 0;
    }
}