/* ==========================================================================
   通用组件：按钮 / 表单 / 卡片 / 标签 / 导航 / 弹层 / 提示
   ========================================================================== */

/* ---------------- 卡片 ---------------- */
.card {
  position: relative;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(22px) saturate(150%);
  -webkit-backdrop-filter: blur(22px) saturate(150%);
  box-shadow: var(--shadow);
}

.card--pad { padding: var(--space-5); }
.card--hover {
  transition: transform var(--dur-2) var(--ease), border-color var(--dur-2) var(--ease),
    box-shadow var(--dur-2) var(--ease);
}
.card--hover:hover {
  transform: translateY(-4px);
  border-color: var(--border-strong);
  box-shadow: var(--shadow-lg);
}

.card--glow::after {
  content: "";
  position: absolute;
  inset: -1px;
  border-radius: inherit;
  padding: 1px;
  background: var(--grad-brand);
  -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  opacity: 0;
  transition: opacity var(--dur-2) var(--ease);
  pointer-events: none;
}
.card--glow:hover::after {
  opacity: 0.55;
}

/* ---------------- 按钮 ---------------- */
.btn {
  --btn-bg: var(--surface-2);
  --btn-fg: var(--text);
  --btn-border: var(--border);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 18px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--btn-border);
  background: var(--btn-bg);
  color: var(--btn-fg);
  font-size: 0.9rem;
  font-weight: 550;
  cursor: pointer;
  white-space: nowrap;
  transition: transform var(--dur-1) var(--ease), background var(--dur-2) var(--ease),
    border-color var(--dur-2) var(--ease), opacity var(--dur-2) var(--ease), color var(--dur-2) var(--ease);
  user-select: none;
}
.btn:hover {
  border-color: var(--border-strong);
  background: var(--surface-3);
}
.btn:active {
  transform: scale(0.97);
}
.btn[disabled],
.btn.is-loading {
  opacity: 0.55;
  pointer-events: none;
}

.btn--primary {
  --btn-bg: var(--grad-brand);
  --btn-fg: #0a0a12;
  --btn-border: transparent;
  background: var(--grad-brand);
  color: #0a0a12;
  font-weight: 650;
  box-shadow: 0 14px 34px -18px var(--accent);
}
.btn--primary:hover {
  filter: brightness(1.07);
  background: var(--grad-brand);
}

.btn--ghost {
  --btn-bg: transparent;
  --btn-border: transparent;
  color: var(--text-2);
}
.btn--ghost:hover {
  background: var(--surface-2);
  color: var(--text);
}

.btn--danger {
  --btn-fg: var(--danger);
  --btn-border: color-mix(in srgb, var(--danger) 35%, transparent);
  background: color-mix(in srgb, var(--danger) 12%, transparent);
}
.btn--danger:hover {
  background: color-mix(in srgb, var(--danger) 20%, transparent);
}

.btn--sm { padding: 7px 13px; font-size: 0.82rem; }
.btn--lg { padding: 14px 26px; font-size: 1rem; }
.btn--block { width: 100%; }

.btn--icon {
  padding: 9px;
  width: 38px;
  height: 38px;
  border-radius: 50%;
}
.btn--icon.btn--sm { width: 32px; height: 32px; padding: 6px; }

.btn.is-loading::before {
  content: "";
  width: 13px;
  height: 13px;
  border-radius: 50%;
  border: 2px solid currentColor;
  border-top-color: transparent;
  animation: spin 0.7s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ---------------- 表单 ---------------- */
.field {
  display: flex;
  flex-direction: column;
  gap: 7px;
}
.field__label {
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-3);
  font-weight: 600;
}
.field__hint {
  font-size: 0.78rem;
  color: var(--text-3);
}
.field__error {
  font-size: 0.8rem;
  color: var(--danger);
}

.input,
.textarea,
.select {
  width: 100%;
  padding: 11px 14px;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  transition: border-color var(--dur-2) var(--ease), background var(--dur-2) var(--ease),
    box-shadow var(--dur-2) var(--ease);
  resize: vertical;
}
.input::placeholder,
.textarea::placeholder {
  color: var(--text-3);
}
.input:focus,
.textarea:focus,
.select:focus {
  outline: none;
  border-color: color-mix(in srgb, var(--accent) 65%, transparent);
  background: var(--surface-3);
  box-shadow: 0 0 0 4px var(--accent-soft);
}
.textarea {
  min-height: 96px;
  line-height: 1.7;
}
.select {
  cursor: pointer;
  appearance: none;
  background-image: linear-gradient(45deg, transparent 50%, var(--text-3) 50%),
    linear-gradient(135deg, var(--text-3) 50%, transparent 50%);
  background-position: calc(100% - 18px) 52%, calc(100% - 13px) 52%;
  background-size: 5px 5px, 5px 5px;
  background-repeat: no-repeat;
  padding-right: 36px;
}

.form-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-4);
}
.form-grid .span-2 { grid-column: span 2; }

/* 开关 */
.switch {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  cursor: pointer;
  user-select: none;
  font-size: 0.88rem;
}
.switch input { position: absolute; opacity: 0; pointer-events: none; }
.switch__track {
  width: 42px;
  height: 24px;
  border-radius: 999px;
  background: var(--surface-3);
  border: 1px solid var(--border);
  position: relative;
  transition: background var(--dur-2) var(--ease);
}
.switch__track::after {
  content: "";
  position: absolute;
  top: 2px;
  left: 2px;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--text-2);
  transition: transform var(--dur-2) var(--ease), background var(--dur-2) var(--ease);
}
.switch input:checked + .switch__track {
  background: var(--grad-brand);
  border-color: transparent;
}
.switch input:checked + .switch__track::after {
  transform: translateX(18px);
  background: #0b0b12;
}

/* 分段控件 */
.segmented {
  display: inline-flex;
  padding: 3px;
  gap: 2px;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-pill);
}
.segmented__item {
  padding: 6px 14px;
  border-radius: var(--radius-pill);
  border: none;
  background: transparent;
  color: var(--text-3);
  font-size: 0.84rem;
  cursor: pointer;
  transition: all var(--dur-2) var(--ease);
}
.segmented__item:hover { color: var(--text); }
.segmented__item.is-active {
  background: var(--surface-3);
  color: var(--text);
  box-shadow: var(--shadow-sm);
}

/* ---------------- 标签 / 徽章 ---------------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 4px 11px;
  border-radius: var(--radius-pill);
  background: var(--surface-2);
  border: 1px solid var(--border);
  font-size: 0.78rem;
  color: var(--text-2);
  transition: all var(--dur-2) var(--ease);
}
.tag--link { cursor: pointer; }
.tag--link:hover,
.tag--link.is-active {
  color: var(--text);
  border-color: color-mix(in srgb, var(--accent) 55%, transparent);
  background: var(--accent-soft);
}
.tag::before { content: "#"; opacity: 0.5; }
.tag--plain::before { content: none; }

.badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 2px 9px;
  border-radius: var(--radius-pill);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.03em;
  border: 1px solid var(--border);
  color: var(--text-2);
  background: var(--surface-2);
}
.badge--private {
  color: var(--warning);
  border-color: color-mix(in srgb, var(--warning) 40%, transparent);
  background: color-mix(in srgb, var(--warning) 12%, transparent);
}
.badge--public {
  color: var(--success);
  border-color: color-mix(in srgb, var(--success) 35%, transparent);
  background: color-mix(in srgb, var(--success) 10%, transparent);
}
.badge--pinned {
  color: var(--accent-2);
  border-color: color-mix(in srgb, var(--accent-2) 40%, transparent);
  background: color-mix(in srgb, var(--accent-2) 12%, transparent);
}

.meta-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.84rem;
  color: var(--text-2);
}
.meta-chip svg { opacity: 0.75; }

/* ---------------- 顶栏 ---------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  height: var(--header-h);
  display: flex;
  align-items: center;
  transition: background var(--dur-2) var(--ease), border-color var(--dur-2) var(--ease),
    backdrop-filter var(--dur-2) var(--ease);
  border-bottom: 1px solid transparent;
}
.site-header.is-stuck {
  background: color-mix(in srgb, var(--bg) 72%, transparent);
  backdrop-filter: blur(18px) saturate(160%);
  -webkit-backdrop-filter: blur(18px) saturate(160%);
  border-bottom-color: var(--border);
}
.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 650;
  letter-spacing: -0.01em;
  min-width: 0;
}
.brand__mark {
  width: 32px;
  height: 32px;
  border-radius: 10px;
  background: var(--grad-brand);
  display: grid;
  place-items: center;
  font-size: 0.9rem;
  font-weight: 800;
  color: #0b0b12;
  box-shadow: 0 8px 22px -10px var(--accent);
  flex: none;
}
.brand__text {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
  min-width: 0;
}
.brand__title { font-size: 0.98rem; }
.brand__sub { font-size: 0.68rem; color: var(--text-3); letter-spacing: 0.08em; text-transform: uppercase; }

.nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
}
.nav-link {
  padding: 8px 14px;
  border-radius: var(--radius-pill);
  font-size: 0.88rem;
  color: var(--text-2);
  transition: all var(--dur-2) var(--ease);
}
.nav-link:hover { color: var(--text); background: var(--surface-2); }
.nav-link.is-active {
  color: var(--text);
  background: var(--surface-3);
}

.header-actions { display: flex; align-items: center; gap: 8px; }

/* ---------------- 页脚 ---------------- */
.site-footer {
  margin-top: var(--space-8);
  padding: var(--space-6) 0 var(--space-7);
  border-top: 1px solid var(--border);
  color: var(--text-3);
  font-size: 0.84rem;
}
.site-footer .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  flex-wrap: wrap;
}

/* ---------------- 提示条（Toast） ---------------- */
.toast-stack {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 90;
  display: flex;
  flex-direction: column;
  gap: 10px;
  align-items: center;
  pointer-events: none;
}
.toast {
  pointer-events: auto;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 11px 18px;
  border-radius: var(--radius-pill);
  background: color-mix(in srgb, var(--surface-solid) 88%, transparent);
  border: 1px solid var(--border-strong);
  box-shadow: var(--shadow-lg);
  backdrop-filter: blur(18px);
  font-size: 0.88rem;
  animation: toast-in var(--dur-2) var(--ease-out);
  max-width: min(92vw, 480px);
}
.toast.is-out { animation: toast-out var(--dur-2) var(--ease) forwards; }
.toast__dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--info);
  flex: none;
}
.toast--success .toast__dot { background: var(--success); }
.toast--error .toast__dot { background: var(--danger); }
.toast--warn .toast__dot { background: var(--warning); }

@keyframes toast-in {
  from { opacity: 0; transform: translateY(14px) scale(0.96); }
  to { opacity: 1; transform: none; }
}
@keyframes toast-out {
  to { opacity: 0; transform: translateY(10px) scale(0.97); }
}

/* ---------------- 弹窗 ---------------- */
.modal {
  position: fixed;
  inset: 0;
  z-index: 80;
  display: grid;
  place-items: center;
  padding: var(--space-5);
  background: color-mix(in srgb, #000 58%, transparent);
  backdrop-filter: blur(10px);
  animation: fade-in var(--dur-2) var(--ease);
}
.modal__card {
  width: min(560px, 100%);
  max-height: 86vh;
  overflow: auto;
  background: var(--surface-solid);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  animation: modal-in var(--dur-3) var(--ease-out);
}
.modal__head {
  padding: var(--space-5) var(--space-5) 0;
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--space-4);
}
.modal__title { font-size: 1.15rem; }
.modal__body { padding: var(--space-4) var(--space-5); }
.modal__foot {
  padding: 0 var(--space-5) var(--space-5);
  display: flex;
  justify-content: flex-end;
  gap: var(--space-2);
}

@keyframes fade-in { from { opacity: 0; } to { opacity: 1; } }
@keyframes modal-in {
  from { opacity: 0; transform: translateY(18px) scale(0.97); }
  to { opacity: 1; transform: none; }
}

/* ---------------- 灯箱 ---------------- */
.lightbox {
  position: fixed;
  inset: 0;
  z-index: 95;
  display: flex;
  flex-direction: column;
  background: color-mix(in srgb, #000 82%, transparent);
  backdrop-filter: blur(22px);
  animation: fade-in var(--dur-2) var(--ease);
}
.lightbox__top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-4) var(--space-5);
  color: rgba(255, 255, 255, 0.82);
  font-size: 0.85rem;
}
.lightbox__stage {
  flex: 1;
  display: grid;
  place-items: center;
  padding: 0 var(--space-5);
  min-height: 0;
  position: relative;
}
.lightbox__stage img,
.lightbox__stage video {
  max-width: min(94vw, 1400px);
  max-height: 78vh;
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  object-fit: contain;
}
.lightbox__nav {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 46px;
  height: 46px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.16);
  color: #fff;
  cursor: pointer;
  transition: background var(--dur-2) var(--ease);
}
.lightbox__nav:hover { background: rgba(255, 255, 255, 0.2); }
.lightbox__nav--prev { left: 18px; }
.lightbox__nav--next { right: 18px; }
.lightbox__bottom {
  padding: var(--space-4) var(--space-5) var(--space-6);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-3);
  color: rgba(255, 255, 255, 0.78);
}
.lightbox__caption {
  max-width: 720px;
  text-align: center;
  font-size: 0.9rem;
  line-height: 1.6;
}
.lightbox__thumbs {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  max-width: 90vw;
  padding: 4px;
}
.lightbox__thumb {
  width: 52px;
  height: 52px;
  border-radius: 10px;
  overflow: hidden;
  border: 2px solid transparent;
  opacity: 0.55;
  cursor: pointer;
  flex: none;
  background: #111;
}
.lightbox__thumb img { width: 100%; height: 100%; object-fit: cover; }
.lightbox__thumb.is-active { border-color: var(--accent-2); opacity: 1; }

/* ---------------- 骨架屏 / 空状态 ---------------- */
.skeleton {
  border-radius: var(--radius);
  background: linear-gradient(100deg, var(--surface) 30%, var(--surface-3) 50%, var(--surface) 70%);
  background-size: 240% 100%;
  animation: shimmer 1.5s linear infinite;
}
@keyframes shimmer {
  from { background-position: 140% 0; }
  to { background-position: -40% 0; }
}

.empty {
  text-align: center;
  padding: var(--space-7) var(--space-5);
  border: 1px dashed var(--border-strong);
  border-radius: var(--radius-lg);
  color: var(--text-3);
  background: var(--surface);
}
.empty__icon {
  font-size: 2rem;
  margin-bottom: var(--space-3);
  filter: saturate(0.7);
}

/* ---------------- 分割线 ---------------- */
.divider {
  height: 1px;
  background: var(--border);
  border: 0;
  margin: var(--space-5) 0;
}

@media (max-width: 720px) {
  .form-grid { grid-template-columns: 1fr; }
  .form-grid .span-2 { grid-column: auto; }
  .nav-links { display: none; }
  .toast-stack { bottom: 14px; }
}