/* Theme scaffold: two variable sets, light (default) and dark. Surfaces below
   use the variables, so fine-tuning later means changing values here only. */
:root, [data-theme="light"] {
    --bg: #ffffff;
    --text: #111111;
    --card-bg: #ffffff;
    --border: #6664;
    --btn-bg: #2222;
    --link: var(--accent-dark);
    --hover-bg: #8882;
    --danger: #b91c1c;
    color-scheme: light;
}
[data-theme="dark"] {
    --bg: #121212;
    --text: #e8e8e8;
    --card-bg: #1e1e1e;
    --border: #7775;
    --btn-bg: #fff2;
    --link: var(--accent-light);
    --hover-bg: #fff2;
    --danger: #f87171;
    color-scheme: dark;
}
/* Accent family (青莲色): identical in both themes. */
:root {
    --accent: #801DAE;
    --accent-dark: #69188F;
    --accent-light: #BF8ED6;
    --accent-text: #ffffff;
}
/* Font size setting: small / medium / large scale the whole UI via rem. */
html[data-font-size="small"] { font-size: 14px; }
html[data-font-size="medium"] { font-size: 16px; }
html[data-font-size="large"] { font-size: 18px; }
body { margin: 0; font-family: Arial, sans-serif; background: var(--bg); color: var(--text); }
.container { max-width: 1100px; margin: 0 auto; padding: 16px; }
.topbar { border-bottom: 1px solid var(--border); }
.topbar-inner { display: flex; align-items: center; gap: 8px; }
.topbar-side { width: 44px; display: flex; position: relative; flex-shrink: 0; }
.topbar-side-right { justify-content: flex-end; }
.brand { flex: 1; text-align: center; font-weight: 700; font-size: 1.15rem; text-decoration: none; color: var(--accent); }
.icon-btn { width: 44px; height: 44px; display: flex; align-items: center; justify-content: center; background: none; border: 0; border-radius: 50%; cursor: pointer; color: inherit; padding: 0; }
.icon-btn:hover { background: var(--hover-bg); }
.hamburger { display: grid; gap: 5px; }
.hamburger span { display: block; width: 22px; height: 2px; background: currentColor; border-radius: 2px; }
.menu-panel { display: none; position: absolute; top: calc(100% + 6px); min-width: 260px; background: var(--card-bg); color: var(--text); border: 1px solid var(--border); border-radius: 12px; box-shadow: 0 8px 24px #0004; padding: 6px; z-index: 50; }
.menu-panel.open { display: block; }
.topbar-side:not(.topbar-side-right) .menu-panel { left: 0; }
.topbar-side-right .menu-panel { right: 0; }
.menu-item { display: block; padding: 12px 14px; border-radius: 8px; color: inherit; text-decoration: none; }
a.menu-item:hover, .menu-item-btn:hover { background: var(--hover-bg); }
.menu-item.disabled { opacity: 0.55; }
.menu-item .soon { font-style: normal; font-size: 0.75rem; border: 1px solid var(--border); border-radius: 999px; padding: 1px 8px; margin-left: 8px; }
.menu-user { padding: 12px 14px; font-size: 0.9rem; opacity: 0.75; border-bottom: 1px solid var(--border); margin-bottom: 6px; word-break: break-all; }
.menu-form { margin: 0; }
.menu-item-btn { width: 100%; text-align: left; background: none; border: 0; font: inherit; color: inherit; cursor: pointer; }
nav { display: flex; flex-wrap: wrap; gap: 4px 12px; }
nav a { margin-right: 12px; }
a { color: var(--link); text-decoration: none; }
.card { border: 1px solid var(--border); border-radius: 8px; padding: 16px; margin: 10px 0; background: var(--card-bg); }
.narrow { max-width: 460px; }
.form-grid { display: grid; gap: 10px; }
.form-grid input, .form-grid select, .form-grid textarea { width: 100%; box-sizing: border-box; padding: 8px; background: var(--card-bg); color: var(--text); border: 1px solid var(--border); }
/* Form controls otherwise fall back to the browser default (~13.33px) and
   ignore the font-size setting, same as buttons did before. */
input, select, textarea { font-size: 1rem; }
button, .btn { padding: 10px 24px; border: 1px solid var(--accent); border-radius: 6px; cursor: pointer; background: var(--accent); color: var(--accent-text); font-size: 1rem; }
button:hover, .btn:hover { background: var(--accent-dark); border-color: var(--accent-dark); }
button.danger, .btn.danger { background: var(--btn-bg); color: var(--danger); border-color: var(--border); }
button.danger:hover, .btn.danger:hover { background: var(--hover-bg); border-color: var(--border); }
.danger { color: var(--danger); }
.actions { display: flex; gap: 10px; align-items: center; margin: 10px 0; flex-wrap: wrap; }
.actions-end { justify-content: flex-end; }
.alert { padding: 10px; border-radius: 6px; margin: 10px 0; }
.alert.error { background: #fca5a522; border: 1px solid #ef4444; }
.alert.success { background: #86efac22; border: 1px solid #22c55e; }
.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; }
th, td { border-bottom: 1px solid var(--border); padding: 8px; text-align: left; }
.inline-form { display: inline-block; margin-left: 6px; }
.hint { font-size: 0.92rem; opacity: 0.85; }

/* Dashboard camera cards: 1 column on phones, 2 on tablets, 4 on desktop. */
.cam-grid { display: grid; grid-template-columns: 1fr; gap: 16px; margin: 10px 0; }
@media (min-width: 600px) { .cam-grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1000px) { .cam-grid { grid-template-columns: repeat(4, 1fr); } }
.cam-card { display: block; border: 1px solid var(--border); border-radius: 12px; overflow: hidden; color: inherit; background: var(--card-bg); }
.cam-card:hover { border-color: var(--link); }
.cam-thumb { position: relative; aspect-ratio: 16 / 9; background: #000; }
.cam-thumb img { width: 100%; height: 100%; object-fit: cover; display: block; }
.cam-play { position: absolute; right: 10px; bottom: 10px; width: 44px; height: 44px; border-radius: 50%; background: #000a; color: #fff; display: flex; align-items: center; justify-content: center; font-size: 1.125rem; }
.cam-meta { padding: 12px; display: grid; gap: 4px; }
.cam-name { font-weight: 700; }
.cam-sub { font-size: 0.9rem; opacity: 0.8; }

/* Cameras management page: title left, action right, wraps on narrow screens. */
.page-head { display: flex; justify-content: space-between; align-items: center; gap: 12px; flex-wrap: wrap; }
.page-head h1 { margin: 0; }
.page-head-actions { display: flex; gap: 10px; flex-wrap: wrap; }
/* Management cards: no screenshot, info rows + action row. */
.cam-manage .cam-meta { padding: 16px; }
.cam-manage .cam-name { word-break: break-all; }
.cam-rows { display: grid; gap: 6px; margin-top: 8px; }
.cam-row { display: flex; justify-content: space-between; gap: 12px; font-size: 0.92rem; }
.cam-row .cam-label { opacity: 0.7; flex-shrink: 0; }
.cam-row span:last-child { word-break: break-all; text-align: right; }
.cam-actions { display: flex; flex-wrap: wrap; gap: 8px; padding: 12px 16px; border-top: 1px solid var(--border); align-items: center; }
.cam-actions .inline-form { margin-left: 0; }

/* Page titles: smaller than the browser default; viewer title sits next to a back arrow. */
h1 { font-size: 1.4rem; }
.page-title-row { display: flex; align-items: center; gap: 4px; }
.page-title-row h1 { margin: 0; }
.back-arrow { width: 44px; height: 44px; display: flex; align-items: center; justify-content: center; flex-shrink: 0; font-size: 1.5rem; color: inherit; text-decoration: none; border-radius: 50%; }
.back-arrow:hover { background: var(--hover-bg); }