/* ═══════════════════════════════════════════
   Components — 联合文社
   按钮·卡片·导航·输入·标签·弹窗·表格
   ═══════════════════════════════════════════ */

/* ── Buttons ── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--gap-sm);
  padding: 10px 20px;
  font-family: var(--font-sans);
  font-size: 0.875rem;
  font-weight: 500;
  letter-spacing: -0.01em;
  background: var(--ui-surface);
  color: var(--ui-fg);
  border: var(--ui-border) solid var(--ui-line);
  border-radius: var(--ui-radius);
  cursor: var(--cursor-pointer);
  transition: background var(--dur-fast) var(--ease-out),
              border-color var(--dur-fast) var(--ease-out),
              transform var(--dur-fast) var(--ease-out);
  transform: translateY(0);
  text-decoration: none;
  user-select: none;
  white-space: nowrap;
}
.btn:hover {
  background: var(--ui-surface-2);
  border-color: var(--ui-line-hover);
  transform: translateY(-1px);
}
.btn:active {
  transform: scale(0.98);
}
.btn:focus-visible {
  outline: var(--ui-border) solid var(--ui-fg);
  outline-offset: 2px;
}

.btn-primary {
  background: var(--ui-accent);
  color: var(--ui-bg);
  border-color: var(--ui-accent);
}
.btn-primary:hover {
  background: var(--ui-accent-hover);
  border-color: var(--ui-accent-hover);
}

.btn-ghost {
  background: transparent;
  border-color: transparent;
}
.btn-ghost:hover {
  background: var(--ui-surface);
  border-color: var(--ui-line);
}

.btn-danger {
  background: transparent;
  border-color: var(--ui-line);
  color: #e53e3e;
}
.btn-danger:hover {
  background: #e53e3e;
  border-color: #e53e3e;
  color: #fff;
}

.btn-sm {
  padding: 6px 12px;
  font-size: 0.8rem;
}

.btn-lg {
  padding: 14px 28px;
  font-size: 1rem;
}

.btn-icon {
  width: 36px;
  height: 36px;
  padding: 0;
  border-radius: var(--ui-radius);
}

.btn:disabled, .btn[disabled] {
  opacity: 0.4;
  pointer-events: none;
}

/* ── Cards ── */
.card {
  background: var(--ui-surface);
  border: var(--ui-border) solid var(--ui-line);
  border-radius: var(--ui-radius);
  padding: var(--gap-lg);
  transition: border-color var(--dur-base) var(--ease-out),
              transform var(--dur-base) var(--ease-out);
  transform: translateY(0);
}
.card:hover {
  border-color: var(--ui-line-hover);
  transform: translateY(-1px);
}

.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--gap-md);
  padding-bottom: var(--gap-md);
  border-bottom: var(--ui-border) solid var(--ui-line);
}

.card-title {
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: -0.02em;
}

.card-body { margin-bottom: var(--gap-md); }
.card-body:last-child { margin-bottom: 0; }

.card-footer {
  margin-top: var(--gap-md);
  padding-top: var(--gap-md);
  border-top: var(--ui-border) solid var(--ui-line);
}

/* ── Badge ── */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 2px 8px;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  background: var(--ui-surface-2);
  color: var(--ui-fg-muted);
  border: var(--ui-border) solid var(--ui-line);
  border-radius: var(--ui-radius);
  text-transform: uppercase;
}

.badge-accent {
  background: var(--ui-accent);
  color: var(--ui-bg);
  border-color: var(--ui-accent);
}

.badge-outline {
  background: transparent;
  border-color: var(--ui-line-strong);
}

.badge-success {
  background: transparent;
  border-color: #22c55e;
  color: #22c55e;
}

.badge-warning {
  background: transparent;
  border-color: #f59e0b;
  color: #f59e0b;
}

.badge-danger {
  background: transparent;
  border-color: #e53e3e;
  color: #e53e3e;
}

/* ── Nav ── */
.navbar {
  position: fixed;
  top: 0; left: 0;
  width: 100%;
  height: var(--nav-height);
  background: var(--ui-bg);
  border-bottom: var(--ui-border) solid var(--ui-line);
  z-index: 100;
  display: flex;
  align-items: center;
  transition: background var(--dur-slow) var(--ease-out),
              border-color var(--dur-slow) var(--ease-out);
}

.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-brand {
  font-family: var(--font-serif);
  font-size: 1.125rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  border-bottom: none !important;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--gap-lg);
  list-style: none;
}

.nav-links a {
  font-size: 0.875rem;
  letter-spacing: -0.01em;
  border-bottom: none;
  color: var(--ui-fg-muted);
  transition: color var(--dur-fast) var(--ease-out);
  padding: var(--gap-xs) 0;
  position: relative;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--ui-fg);
  transition: width var(--dur-base) var(--ease-out);
}

.nav-links a:hover, .nav-links a.active {
  color: var(--ui-fg);
}
.nav-links a:hover::after, .nav-links a.active::after {
  width: 100%;
}

.nav-theme-btn {
  background: transparent;
  border: var(--ui-border) solid var(--ui-line);
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.875rem;
  cursor: var(--cursor-pointer);
  border-radius: var(--ui-radius);
  transition: border-color var(--dur-fast) var(--ease-out),
              background var(--dur-fast) var(--ease-out);
}
.nav-theme-btn:hover {
  border-color: var(--ui-line-hover);
  background: var(--ui-surface);
}

.nav-mobile-toggle {
  display: none;
  background: transparent;
  border: none;
  cursor: var(--cursor-pointer);
  width: 32px;
  height: 32px;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
}

/* ── Nav User Area ── */
#nav-user-area {
  display: flex;
  align-items: center;
  gap: var(--gap-sm);
}

.nav-login-link {
  font-family: var(--font-mono) !important;
  font-size: .72rem !important;
  letter-spacing: .06em !important;
  padding: 5px 12px !important;
  border: var(--ui-border) solid var(--ui-line) !important;
  transition: all var(--dur-fast) var(--ease-out) !important;
}
.nav-login-link:hover {
  border-color: var(--ui-line-hover) !important;
  background: var(--ui-surface) !important;
}
.nav-login-link::after { display: none !important; }

.nav-user-info {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: .78rem;
  color: var(--ui-fg);
  letter-spacing: .02em;
}
.nav-user-info .nu-penname {
  font-weight: 500;
  color: inherit;
  text-decoration: none;
  cursor: pointer;
  transition: color .15s ease;
}
.nav-user-info .nu-penname:hover {
  color: #8b7cf7;
}
.nav-user-info .nu-logout {
  font-size: .65rem;
  color: var(--ui-fg-muted);
  cursor: pointer;
  border: none;
  background: none;
  font-family: var(--font-mono);
  letter-spacing: .04em;
  padding: 2px 6px;
  transition: color var(--dur-fast);
}
.nav-user-info .nu-logout:hover {
  color: #f87171;
}

.nav-mobile-toggle span {
  display: block;
  width: 18px;
  height: 2px;
  background: var(--ui-fg);
  transition: transform var(--dur-base) var(--ease-out),
              opacity var(--dur-fast) var(--ease-out);
}

/* Mobile Bottom Nav — 桌面默认隐藏 */
.mobile-bottom-nav {
  display: none;
}

@media (max-width: 768px) {
  /* 隐藏汉堡菜单，底部导航替代 */
  .nav-mobile-toggle { display: none !important; }

  /* 桌面导航链接在移动端隐藏（底部导航替代） */
  .nav-links { display: none !important; }

  /* 底部导航栏 */
  .mobile-bottom-nav {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    z-index: 100;
    display: flex;
    align-items: stretch;
    height: 56px;
    background: var(--ui-bg);
    border-top: var(--ui-border) solid var(--ui-line);
    padding-bottom: env(safe-area-inset-bottom, 0px);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
  }

  .bottom-nav-item {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 1px;
    text-decoration: none;
    color: var(--ui-fg-muted);
    font-size: 9px;
    letter-spacing: 0.02em;
    transition: color var(--dur-fast) var(--ease-out);
    -webkit-tap-highlight-color: transparent;
    padding: 3px 0;
    min-width: 0;
  }

  .bottom-nav-item i {
    font-size: 16px;
    transition: transform var(--dur-base) var(--ease-out);
  }

  .bottom-nav-item span {
    line-height: 1.1;
    font-size: 9px;
  }

  .bottom-nav-item:active i {
    transform: scale(0.88);
  }

  .bottom-nav-item.active {
    color: var(--ui-fg);
  }

  .bottom-nav-item.active i {
    transform: scale(1.05);
  }

  /* 内容区域避开底部导航 */
  body { padding-bottom: 56px; }

  .container { padding: 0 var(--gap-lg); }
  .navbar { backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px); }
  body { padding-top: var(--nav-height); }
  html { scroll-behavior: smooth; -webkit-overflow-scrolling: touch; }

  /* ── 底部导航大加号按钮 ── */
  .bottom-nav-plus {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    background: none;
    border: none;
    color: var(--ui-fg-muted);
    cursor: pointer;
    -webkit-tap-highlight-color: transparent;
    position: relative;
    padding: 0;
  }

  .bottom-nav-plus i {
    font-size: 26px;
    font-weight: 300;
    transition: transform var(--dur-base) var(--ease-out);
    line-height: 1;
  }

  .bottom-nav-plus:active i {
    transform: scale(0.88);
  }

  .bottom-nav-plus.active i {
    transform: rotate(45deg);
  }

  /* ── 更多导航弹出卡片 ── */
  .nav-more-overlay {
    position: fixed;
    inset: 0;
    z-index: 99;
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    align-items: center;
    background: rgba(0, 0, 0, 0.35);
    animation: overlayFadeIn 0.2s ease-out;
  }

  @keyframes overlayFadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
  }

  .nav-more-card {
    background: var(--ui-bg);
    border-top-left-radius: 16px;
    border-top-right-radius: 16px;
    width: 100%;
    max-width: 100%;
    padding: 20px 16px calc(20px + env(safe-area-inset-bottom, 0px));
    box-shadow: 0 -4px 24px rgba(0, 0, 0, 0.12);
    animation: cardSlideUp 0.25s ease-out;
    margin-bottom: 56px;
  }

  @keyframes cardSlideUp {
    from { transform: translateY(100%); }
    to { transform: translateY(0); }
  }

  .nav-more-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 8px;
  }

  .nav-more-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
    padding: 14px 4px;
    text-decoration: none;
    color: var(--ui-fg-muted);
    font-size: 10px;
    border-radius: 12px;
    transition: background var(--dur-fast) var(--ease-out), color var(--dur-fast) var(--ease-out);
    -webkit-tap-highlight-color: transparent;
  }

  .nav-more-item i {
    font-size: 22px;
    transition: transform var(--dur-base) var(--ease-out);
  }

  .nav-more-item:active {
    background: var(--ui-hover);
  }

  .nav-more-item:active i {
    transform: scale(0.9);
  }

  .nav-more-item.active {
    color: var(--ui-fg);
  }
}

/* Tablet: 769px - 1024px */
@media (min-width: 769px) and (max-width: 1024px) {
  .container { padding: 0 var(--gap-xl); }
  .nav-links { gap: var(--gap-md); }
}

/* ── Input ── */
.input {
  width: 100%;
  padding: 10px 12px;
  font-family: var(--font-sans);
  font-size: 0.875rem;
  background: var(--ui-surface);
  color: var(--ui-fg);
  border: var(--ui-border) solid var(--ui-line);
  border-radius: var(--ui-radius);
  transition: border-color var(--dur-fast) var(--ease-out),
              background var(--dur-fast) var(--ease-out);
  cursor: var(--cursor-text);
}
.input:hover { border-color: var(--ui-line-strong); }
.input:focus {
  outline: none;
  border-color: var(--ui-fg);
  background: var(--ui-bg);
}
.input::placeholder { color: var(--ui-fg-muted); }

select.input {
  cursor: var(--cursor-pointer);
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg width='10' height='6' viewBox='0 0 10 6' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M1 1l4 4 4-4' stroke='%235c5c5c' stroke-width='1' fill='none'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  padding-right: 32px;
}

textarea.input {
  resize: vertical;
  min-height: 100px;
}

/* ── Label ── */
.label {
  display: block;
  font-size: 0.8rem;
  font-weight: 500;
  margin-bottom: var(--gap-xs);
  color: var(--ui-fg-muted);
  letter-spacing: -0.01em;
}

/* ── Form Group ── */
.form-group {
  margin-bottom: var(--gap-md);
}

/* ── Separator ── */
.separator {
  height: 1px;
  background: var(--ui-line);
  border: none;
  margin: var(--gap-xl) 0;
}

/* ── Table ── */
.table-wrap {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.875rem;
}

th {
  text-align: left;
  font-weight: 500;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--ui-fg-muted);
  padding: var(--gap-sm) var(--gap-md);
  border-bottom: var(--ui-border) solid var(--ui-line);
  font-family: var(--font-mono);
  white-space: nowrap;
}

td {
  padding: var(--gap-sm) var(--gap-md);
  border-bottom: var(--ui-border) solid var(--ui-line);
}

tr:hover td {
  background: var(--ui-overlay);
}

@media (max-width: 768px) {
  table { font-size: 0.8rem; }
  th, td { padding: 10px 12px; }
}

/* ── Tabs ── */
.tabs {
  display: flex;
  border-bottom: var(--ui-border) solid var(--ui-line);
  gap: 0;
}

.tab {
  padding: var(--gap-sm) var(--gap-md);
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: -0.01em;
  background: transparent;
  border: none;
  border-bottom: 2px solid transparent;
  color: var(--ui-fg-muted);
  cursor: var(--cursor-pointer);
  transition: color var(--dur-fast) var(--ease-out),
              border-color var(--dur-fast) var(--ease-out);
  margin-bottom: -1px;
}
.tab:hover { color: var(--ui-fg); }
.tab.active {
  color: var(--ui-fg);
  border-bottom-color: var(--ui-fg);
}

/* ── Dialog / Modal ── */
.dialog-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.55);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 200;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--dur-base) var(--ease-out);
}
.dialog-overlay.open {
  opacity: 1;
  pointer-events: all;
}

.dialog {
  background: var(--ui-bg);
  border: var(--ui-border) solid var(--ui-line);
  border-radius: var(--ui-radius);
  max-width: 480px;
  width: 90%;
  padding: var(--gap-xl);
  transform: translateY(8px);
  transition: transform var(--dur-base) var(--ease-out);
  max-height: 85vh;
  overflow-y: auto;
}
.dialog-overlay.open .dialog { transform: translateY(0); }

.dialog-title {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: var(--gap-sm);
}

.dialog-body {
  color: var(--ui-fg-muted);
  margin-bottom: var(--gap-lg);
  font-size: 0.875rem;
}

.dialog-actions {
  display: flex;
  justify-content: flex-end;
  gap: var(--gap-sm);
  flex-wrap: wrap;
}

@media (max-width: 480px) {
  .dialog { padding: var(--gap-lg); width: 95%; }
  .dialog-actions { flex-direction: column; }
  .dialog-actions .btn { width: 100%; justify-content: center; }
}

/* ── Toast ── */
.toast-container {
  position: fixed;
  top: calc(var(--nav-height) + var(--gap-md));
  right: var(--gap-md);
  z-index: 300;
  display: flex;
  flex-direction: column;
  gap: var(--gap-sm);
}

.toast {
  background: var(--ui-bg);
  border: var(--ui-border) solid var(--ui-line);
  padding: var(--gap-sm) var(--gap-md);
  font-size: 0.8rem;
  animation: slideInRight var(--dur-base) var(--ease-out);
  max-width: 320px;
}

.toast.removing {
  animation: fadeOut var(--dur-base) var(--ease-in) forwards;
}

/* ── Tooltip ── */
.tooltip {
  position: relative;
}
.tooltip::after {
  content: attr(data-tooltip);
  position: absolute;
  bottom: calc(100% + 8px);
  left: 50%;
  transform: translateX(-50%) translateY(4px);
  background: var(--ui-fg);
  color: var(--ui-bg);
  padding: 4px 8px;
  font-size: 0.7rem;
  font-family: var(--font-mono);
  white-space: nowrap;
  border: var(--ui-border) solid var(--ui-fg);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--dur-fast) var(--ease-out),
              transform var(--dur-fast) var(--ease-out);
  z-index: 50;
}
.tooltip:hover::after {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* ── Progress ── */
.progress {
  width: 100%;
  height: 4px;
  background: var(--ui-surface-2);
  border: var(--ui-border) solid var(--ui-line);
  overflow: hidden;
}
.progress-bar {
  height: 100%;
  background: var(--ui-fg);
  transition: width var(--dur-slow) var(--ease-out);
}

/* ── Switch ── */
.switch {
  display: inline-flex;
  align-items: center;
  gap: var(--gap-sm);
  cursor: var(--cursor-pointer);
}
.switch-track {
  width: 36px;
  height: 20px;
  background: var(--ui-surface-2);
  border: var(--ui-border) solid var(--ui-line);
  position: relative;
  transition: background var(--dur-fast) var(--ease-out),
              border-color var(--dur-fast) var(--ease-out);
}
.switch-track::after {
  content: '';
  position: absolute;
  top: 2px; left: 2px;
  width: 14px; height: 14px;
  background: var(--ui-fg-muted);
  transition: transform var(--dur-fast) var(--ease-out),
              background var(--dur-fast) var(--ease-out);
}
.switch input:checked + .switch-track {
  background: var(--ui-accent);
  border-color: var(--ui-accent);
}
.switch input:checked + .switch-track::after {
  transform: translateX(16px);
  background: var(--ui-bg);
}
.switch input { position: absolute; opacity: 0; pointer-events: none; }

/* ── Typewriter ── */
.typewriter {
  display: inline;
  border-right: 2px solid var(--ui-fg);
  animation: blink 1s step-end infinite;
}
@keyframes blink {
  50% { border-color: transparent; }
}

/* ── Section ── */
.section {
  padding: var(--gap-3xl) 0;
}

@media (max-width: 768px) {
  .section {
    padding: var(--gap-2xl) 0;
  }
}

.section-label {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ui-fg-muted);
  margin-bottom: var(--gap-sm);
}

/* ── Contest Card (Special) ── */
.contest-card {
  display: block;
  background: var(--ui-surface);
  border: var(--ui-border) solid var(--ui-line);
  padding: var(--gap-xl);
  text-decoration: none;
  transition: border-color var(--dur-base) var(--ease-out),
              transform var(--dur-base) var(--ease-out);
  transform: translateY(0);
}
.contest-card:hover {
  border-color: var(--ui-line-hover);
  transform: translateY(-1px);
}
.contest-card .contest-label {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ui-fg-muted);
  margin-bottom: var(--gap-sm);
}
.contest-card .contest-name {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  margin-bottom: var(--gap-sm);
  color: var(--ui-fg);
}
.contest-card .contest-desc {
  font-size: 0.875rem;
  color: var(--ui-fg-muted);
  margin-bottom: var(--gap-md);
}
.contest-card .contest-meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--gap-md);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--ui-fg-muted);
  padding-top: var(--gap-md);
  border-top: var(--ui-border) solid var(--ui-line);
}
.contest-card .contest-meta span {
  display: flex;
  align-items: center;
  gap: var(--gap-xs);
}

/* ── Footer ── */
.footer {
  border-top: var(--ui-border) solid var(--ui-line);
  padding: var(--gap-2xl) 0;
  font-size: 0.8rem;
  color: var(--ui-fg-muted);
  margin-top: var(--gap-3xl);
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--gap-xl);
}

.footer-col h4 {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--ui-fg);
  margin-bottom: var(--gap-sm);
}

.footer-col p, .footer-col a {
  font-size: 0.8rem;
  color: var(--ui-fg-muted);
  display: block;
  margin-bottom: var(--gap-xs);
  border-bottom: none;
}

.footer-col a:hover {
  color: var(--ui-fg);
}

.footer-bottom {
  margin-top: var(--gap-xl);
  padding-top: var(--gap-md);
  border-top: var(--ui-border) solid var(--ui-line);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--gap-sm);
}

@media (max-width: 768px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 480px) {
  .footer-grid {
    grid-template-columns: 1fr;
  }
  .footer-bottom {
    flex-direction: column;
    gap: var(--gap-xs);
  }
}