:root {
  --bg: #f5f6f8;
  --surface: #ffffff;
  --text: #1b1f27;
  --muted: #667085;
  --border: #dfe3ea;
  --primary: #1f6feb;
  --primary-text: #ffffff;
  --danger: #c62828;
  --ok: #1a7f37;
  --warn: #9a6700;
  --radius: 10px;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #12151a;
    --surface: #1b2028;
    --text: #e8ebf0;
    --muted: #9aa4b2;
    --border: #2d3441;
    --primary: #4c8dff;
    --primary-text: #0b1220;
    --danger: #ff6b6b;
    --ok: #4cc26a;
    --warn: #e3b341;
  }
}

* {
  box-sizing: border-box;
}

/* Để thuộc tính hidden luôn thắng các rule display: flex/grid bên dưới. */
[hidden] {
  display: none !important;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 15px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

.wrap {
  max-width: 980px;
  margin: 0 auto;
  padding: 0 16px;
}

.topbar {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
}
.topbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 56px;
}

main.wrap {
  padding-top: 20px;
  padding-bottom: 40px;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px;
  margin-bottom: 20px;
}
h2 {
  margin: 0 0 14px;
  font-size: 18px;
}
.muted {
  color: var(--muted);
  font-size: 13px;
}
.error {
  color: var(--danger);
  margin: 8px 0;
}

.btn {
  font: inherit;
  padding: 8px 14px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  cursor: pointer;
}
.btn:hover:not(:disabled) {
  border-color: var(--primary);
}
.btn:disabled {
  opacity: 0.55;
  cursor: not-allowed;
}
.btn.primary {
  background: var(--primary);
  border-color: var(--primary);
  color: var(--primary-text);
}
.btn.ghost {
  border-color: transparent;
  color: var(--muted);
}
.btn.danger {
  color: var(--danger);
}
.btn.small {
  padding: 4px 10px;
  font-size: 13px;
}
.btn.block {
  display: block;
  width: 100%;
}
button:focus-visible,
input:focus-visible,
.dropzone:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}

input[type="text"],
input[type="password"],
input[type="search"] {
  font: inherit;
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg);
  color: var(--text);
  width: 100%;
}

.dropzone {
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  padding: 28px 16px;
  text-align: center;
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s;
}
.dropzone p {
  margin: 4px 0;
}
.dropzone:hover,
.dropzone.over {
  border-color: var(--primary);
  background: color-mix(in srgb, var(--primary) 8%, transparent);
}

.actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-top: 14px;
}
.actions.center {
  justify-content: center;
}

/* Hàng đợi upload */
.queue {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}
.row {
  display: grid;
  grid-template-columns: 64px 1fr auto;
  gap: 12px;
  align-items: center;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px;
}
.row img {
  width: 64px;
  height: 64px;
  object-fit: cover;
  border-radius: 6px;
  background: var(--bg);
}
.row .main {
  min-width: 0;
}
.slug-line {
  display: flex;
  align-items: center;
  gap: 6px;
}
.slug-line .prefix {
  color: var(--muted);
  font-size: 13px;
  white-space: nowrap;
}
.status {
  font-size: 13px;
  margin-top: 4px;
  word-break: break-word;
}
.status.ok {
  color: var(--ok);
}
.status.err {
  color: var(--danger);
}
.status.warn {
  color: var(--warn);
}
.link-line {
  display: flex;
  gap: 6px;
  margin-top: 6px;
}
.link-line input {
  font-family: ui-monospace, Consolas, monospace;
  font-size: 13px;
}
.row .side {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

/* Thư viện ảnh */
.gallery-head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 14px;
}
.gallery-head h2 {
  margin: 0;
}
.gallery-head input {
  max-width: 260px;
}
.gallery {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(190px, 1fr));
  gap: 14px;
}
.item {
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}
.item img {
  width: 100%;
  aspect-ratio: 1;
  object-fit: cover;
  background: var(--bg);
  display: block;
}
.item .info {
  padding: 8px 10px 0;
  min-width: 0;
}
.item .name {
  font-weight: 600;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.item .btns {
  display: flex;
  gap: 6px;
  padding: 8px 10px 10px;
  flex-wrap: wrap;
}

.toast {
  position: fixed;
  left: 50%;
  bottom: 24px;
  transform: translateX(-50%);
  background: var(--text);
  color: var(--bg);
  padding: 10px 18px;
  border-radius: 8px;
  font-size: 14px;
  z-index: 10;
}

/* Trang đăng nhập */
.login-body {
  display: grid;
  place-items: center;
  min-height: 100vh;
  padding: 16px;
}
.login-card {
  width: 100%;
  max-width: 360px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
}
.login-card h1 {
  margin: 0 0 4px;
  font-size: 22px;
}
.login-card label {
  display: block;
  margin: 16px 0 6px;
  font-size: 14px;
}
.login-card .btn {
  margin-top: 14px;
}

@media (max-width: 560px) {
  .row {
    grid-template-columns: 52px 1fr;
  }
  .row img {
    width: 52px;
    height: 52px;
  }
  .row .side {
    grid-column: 1 / -1;
    flex-direction: row;
  }
}