/* =====================================================
   Cardiothoracic Theatre Viewer
   settings.css
   -----------------------------------------------------
   Settings bottom-sheet panel: dark mode + text size, with
   room to grow. Same overlay/sheet mechanics as the old
   Insights panel (insights.css) - a transparent backdrop
   plus a panel that slides up from the bottom.
   ===================================================== */

:root{
    --nhs-blue:#2563EB;
    --ink:#212B32;
    --ink-soft:#4C6272;
    --line:#E1E6EA;
    --radius:12px;
}

/* ============================
   Overlay
============================ */

#settingsOverlay {
    position: fixed;
    inset: 0;
    background: rgba(15,20,30,.4);
    opacity: 0;
    visibility: hidden;
    transition: .3s;
    z-index: 998;
}

#settingsOverlay.show {
    opacity: 1;
    visibility: visible;
}

/* ============================
   Bottom Sheet
============================ */

#settingsPanel {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    background: #fff;
    border-radius: 20px 20px 0 0;
    transform: translateY(100%);
    transition: transform .35s ease;
    box-shadow: 0 -8px 24px rgba(33,43,50,.18);
    z-index: 999;
    padding-bottom: 20px;
}

#settingsPanel.show {
    transform: translateY(0);
}

#settingsPanel.hidden {
    display: none;
}

.settings-header {
    text-align: center;
    padding: 6px 20px 16px;
}

.settings-header h2 {
    margin: 0;
    font-size: 1.2rem;
    color: var(--nhs-blue);
}

/* ============================
   Rows
============================ */

.settings-body {
    padding: 0 20px;
}

.settings-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 14px;
    padding: 16px 0;
    border-bottom: 1px solid var(--line);
}
.settings-row:last-child { border-bottom: none; }

.settings-row-stacked {
    flex-direction: column;
    align-items: stretch;
    gap: 10px;
}

.settings-label {
    font-size: 15px;
    font-weight: 700;
    color: var(--ink);
}

/* Dark mode switch */

.settings-switch {
    width: 50px;
    height: 30px;
    border-radius: 999px;
    border: none;
    background: #D8DEE4;
    position: relative;
    cursor: pointer;
    flex: none;
    transition: background .2s ease;
}

.settings-switch-knob {
    position: absolute;
    top: 3px;
    left: 3px;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: #fff;
    box-shadow: 0 1px 3px rgba(0,0,0,.25);
    transition: transform .2s ease;
}

.settings-switch[aria-checked="true"] {
    background: var(--nhs-blue);
}
.settings-switch[aria-checked="true"] .settings-switch-knob {
    transform: translateX(20px);
}
.settings-switch:active .settings-switch-knob {
    transform:scale(.92) translateX(0);
}
.settings-switch[aria-checked="true"]:active .settings-switch-knob {
    transform:scale(.92) translateX(20px);
}

/* Text size picker */

.settings-textsize {
    display: flex;
    gap: 8px;
}

.settings-textsize-btn {
    flex: 1;
    border: 2px solid var(--line);
    background: #fff;
    border-radius: 10px;
    padding: 10px 0;
    font-weight: 700;
    color: var(--ink-soft);
    cursor: pointer;
    transition: transform .1s ease, border-color .15s ease, color .15s ease, background .15s ease;
}
.settings-textsize-btn:active { transform: scale(.95); }

.settings-textsize-btn[data-size="small"] { font-size: 13px; }
.settings-textsize-btn[data-size="normal"] { font-size: 16px; }
.settings-textsize-btn[data-size="large"] { font-size: 19px; }

.settings-textsize-btn.active {
    border-color: var(--nhs-blue);
    color: var(--nhs-blue);
    background: #E6EEFD;
}

/* ============================
   Text size (whole app)
   ------------------------------------------------------
   zoom scales layout and text together without needing
   every font-size in the app rewritten in rem - and is
   well supported in Safari (including iOS, where this PWA
   mostly lives), Chrome and modern Firefox.
============================ */

html[data-text-size="small"] { zoom: 0.9; }
html[data-text-size="large"] { zoom: 1.15; }

/* ============================
   Dark Mode
============================ */

html[data-theme="dark"] #settingsPanel {
    background: #1B2430;
}
html[data-theme="dark"] .settings-header h2,
html[data-theme="dark"] .settings-label {
    color: #E4E9EF;
}
html[data-theme="dark"] .settings-row {
    border-bottom-color: #2A3542;
}
html[data-theme="dark"] .drag-handle {
    background: #3A4656;
}
html[data-theme="dark"] .settings-switch {
    background: #3A4656;
}
html[data-theme="dark"] .settings-textsize-btn {
    background: #1B2430;
    border-color: #3A4656;
    color: #93A1B1;
}
html[data-theme="dark"] .settings-textsize-btn.active {
    border-color: var(--nhs-blue);
    color: #9DBFF2;
    background: #1C2C4A;
}