/* ═══════════════════════════════════════════
   期许AI Components v2.0
   Buttons / Cards / Tables / Code / Forms
   呼吸感增强：更大内边距、更宽间距
   ═══════════════════════════════════════════ */

/* ═══ BUTTONS ═══ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  font-size: 14px;
  font-weight: 600;
  padding: 12px 26px;
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  white-space: nowrap;
  line-height: 1.4;
  position: relative;
  cursor: pointer;
}

.btn:focus-visible {
  outline: 2px solid var(--qixu-primary);
  outline-offset: 3px;
}

.btn-primary {
  background: var(--qixu-primary);
  color: #fff;
  box-shadow: 0 2px 10px rgba(67, 97, 238, 0.32);
}

.btn-primary:hover {
  background: var(--qixu-primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(67, 97, 238, 0.42);
}

.btn-primary:active { transform: translateY(0); }

.btn-gradient {
  background: var(--qixu-gradient-brand);
  background-size: 200% 200%;
  color: #fff;
  animation: gradient-shift 6s ease infinite;
}

.btn-gradient:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-glow);
}

@keyframes gradient-shift {
  0%, 100% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
}

.btn-secondary {
  background: transparent;
  color: var(--qixu-text-primary);
  border: 1.5px solid var(--qixu-border-strong);
}

.btn-secondary:hover {
  background: var(--qixu-bg-hover);
  border-color: var(--qixu-text-muted);
}

.btn-ghost {
  background: transparent;
  color: var(--qixu-primary-light);
}

.btn-ghost:hover { background: var(--qixu-primary-glow); }

.btn-danger {
  background: var(--qixu-error);
  color: #fff;
}

.btn-danger:hover { opacity: 0.9; transform: translateY(-1px); }

/* Sizes */
.btn-lg { font-size: 16px; padding: 16px 36px; border-radius: var(--radius-lg); }
.btn-sm { font-size: 13px; padding: 9px 18px; }
.btn-xs { font-size: 12px; padding: 6px 14px; border-radius: var(--radius-sm); }
.btn-block { width: 100%; }

/* Icon button */
.btn-icon {
  width: 40px;
  height: 40px;
  padding: 0;
  border-radius: var(--radius-md);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  color: var(--qixu-text-secondary);
  transition: all var(--transition-fast);
}

.btn-icon:hover {
  background: var(--qixu-bg-hover);
  color: var(--qixu-text-primary);
}


/* ═══ NAVIGATION ═══ */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-h);
  z-index: 1000;
  display: flex;
  align-items: center;
  transition: all var(--transition-normal);
}

.nav.scrolled {
  background: color-mix(in srgb, var(--qixu-bg-base) 85%, transparent);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--qixu-border);
}

.nav-inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 var(--space-8);
  width: 100%;
  display: flex;
  align-items: center;
  gap: var(--space-10); /* 呼吸感：导航内部间距加大 */
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
  flex-shrink: 0;
}

.logo img,
.logo svg {
  height: 34px;
  width: auto;
}

.logo-text {
  font-size: 22px;
  font-weight: 900;
  letter-spacing: 0;
  display: flex;
  align-items: baseline;
  gap: 2px;
}

.logo-text .qi { color: var(--qixu-primary-light); }
.logo-text .xu { color: var(--qixu-violet-light); }
.logo-text .ai-badge {
  font-size: 12px;
  font-weight: 700;
  color: var(--qixu-text-muted);
  margin-left: 6px;
  padding-left: 10px;
  border-left: 1.5px solid var(--qixu-border);
}

.nav-links {
  display: flex;
  gap: var(--space-8); /* 呼吸感：导航链接间距从 32px → 40px */
  margin-left: var(--space-6);
}

.nav-link {
  font-size: 14px;
  font-weight: 500;
  color: var(--qixu-text-secondary);
  transition: color var(--transition-fast);
  position: relative;
  padding: 6px 0;
  white-space: nowrap;
}

.nav-link:hover { color: var(--qixu-text-primary); }

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -1px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--qixu-gradient-aurora);
  border-radius: 2px;
  transition: width var(--transition-normal);
}

.nav-link:hover::after { width: 100%; }

.nav-link.active {
  color: var(--qixu-primary-light);
}

.nav-link.active::after {
  width: 100%;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  margin-left: auto;
  flex-shrink: 0;
}

.nav-toggle {
  display: none;
  width: 42px;
  height: 42px;
  border-radius: var(--radius-md);
  color: var(--qixu-text-primary);
  font-size: 20px;
  align-items: center;
  justify-content: center;
}

.theme-switch {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  color: var(--qixu-text-muted);
  font-size: 17px;
  transition: all var(--transition-fast);
  display: flex;
  align-items: center;
  justify-content: center;
}

.theme-switch:hover {
  background: var(--qixu-bg-hover);
  color: var(--qixu-text-primary);
}


/* ═══ CARDS ═══ */
.card {
  background: var(--qixu-bg-surface);
  border: 1px solid var(--qixu-border);
  border-radius: var(--radius-xl);
  padding: var(--space-8); /* 呼吸感：卡片内边距加大 */
  transition: all var(--transition-normal);
}

.card:hover {
  border-color: var(--qixu-border-strong);
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
}

.card-glow:hover {
  box-shadow: var(--shadow-glow), var(--shadow-lg);
}

.card-flat:hover {
  transform: none;
  box-shadow: var(--shadow-md);
}


/* ═══ CODE BLOCK ═══ */
.code-card {
  background: rgba(15, 21, 36, 0.94);
  border: 1px solid var(--qixu-border-strong);
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-xl);
  backdrop-filter: blur(10px);
}

.code-card-head {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: 14px 20px;
  border-bottom: 1px solid var(--qixu-border);
  background: rgba(255, 255, 255, 0.02);
}

.code-dots {
  display: flex;
  gap: 7px;
}

.code-dots i {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  display: block;
}

.code-dots i:nth-child(1) { background: #FF5F57; }
.code-dots i:nth-child(2) { background: #FEBC2E; }
.code-dots i:nth-child(3) { background: #28C840; }

.code-file {
  margin-left: var(--space-3);
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--qixu-text-muted);
}

.code-tabs {
  display: flex;
  gap: var(--space-1);
  padding: 10px 16px 0;
  border-bottom: 1px solid var(--qixu-border);
}

.code-tab {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  color: var(--qixu-text-muted);
  padding: 8px 16px;
  border-radius: var(--radius-sm) var(--radius-sm) 0 0;
  cursor: pointer;
  transition: all var(--transition-fast);
  border: 1px solid transparent;
  border-bottom: none;
}

.code-tab:hover { color: var(--qixu-text-secondary); }

.code-tab.active {
  color: var(--qixu-primary-light);
  background: var(--qixu-primary-glow);
  border-color: var(--qixu-border);
}

.code-body {
  padding: var(--space-6) var(--space-8);
  overflow-x: auto;
}

.code-pane { display: none; }
.code-pane.active { display: block; animation: fadeIn 0.3s var(--ease-out); }

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(4px); }
  to { opacity: 1; transform: translateY(0); }
}

.code-body pre {
  font-family: var(--font-mono);
  font-size: 13.5px;
  line-height: 1.85;
  color: #E8ECF4;
  margin: 0;
  white-space: pre;
}

/* Syntax highlighting */
.c-c { color: #556278; }
.c-k { color: #C792EA; }
.c-s { color: #C3E88D; }
.c-f { color: #82AAFF; }
.c-n { color: #F78C6C; }
.c-v { color: #89DDFF; }
.c-p { color: #FFCB6B; }
.c-o { color: #89DDFF; }


/* ═══ TABLES ═══ */
.data-table {
  width: 100%;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--qixu-border);
}

.data-table th,
.data-table td {
  padding: var(--space-5) var(--space-6);
  text-align: left;
  font-size: 14px;
  border-bottom: 1px solid var(--qixu-border);
}

.data-table th {
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--qixu-text-muted);
  background: var(--qixu-bg-elevated);
}

.data-table tbody tr:last-child td { border-bottom: none; }

.data-table tbody tr:hover {
  background: var(--qixu-bg-hover);
}

/* ═══ BADGES / TAGS ═══ */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  padding: 4px 12px;
  border-radius: var(--radius-full);
  white-space: nowrap;
}

.badge-primary {
  color: var(--qixu-primary-light);
  background: var(--qixu-primary-glow);
  border: 1px solid rgba(67, 97, 238, 0.25);
}

.badge-success {
  color: var(--qixu-signal);
  background: var(--qixu-success-bg);
  border: 1px solid rgba(6, 214, 160, 0.2);
}

.badge-violet {
  color: var(--qixu-violet-light);
  background: rgba(114, 9, 183, 0.12);
  border: 1px solid rgba(114, 9, 183, 0.25);
}

.badge-warning {
  color: var(--qixu-warning);
  background: var(--qixu-warning-bg);
}

.badge-error {
  color: var(--qixu-error);
  background: var(--qixu-error-bg);
}

.tag {
  font-size: 11px;
  font-weight: 500;
  color: var(--qixu-text-secondary);
  background: var(--qixu-bg-elevated);
  border: 1px solid var(--qixu-border);
  padding: 4px 10px;
  border-radius: var(--radius-sm);
}


/* ═══ FORM INPUTS ═══ */
.input {
  width: 100%;
  padding: 12px 16px;
  font-size: 14px;
  font-family: var(--font-sans);
  color: var(--qixu-text-primary);
  background: var(--qixu-bg-input);
  border: 1.5px solid var(--qixu-border);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  outline: none;
}

.input:focus {
  border-color: var(--qixu-primary);
  box-shadow: 0 0 0 3px var(--qixu-primary-glow);
}

.input::placeholder { color: var(--qixu-text-muted); }

.input-group {
  display: flex;
  gap: var(--space-3);
}

.input-group .input { flex: 1; }


/* ═══ STATS BOX ═══ */
.stat-box {
  text-align: center;
  padding: var(--space-8) var(--space-6);
  background: var(--qixu-bg-elevated);
  border: 1px solid var(--qixu-border);
  border-radius: var(--radius-lg);
  transition: all var(--transition-normal);
}

.stat-box:hover {
  border-color: var(--qixu-border-strong);
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

.stat-num {
  font-size: clamp(30px, 3.5vw, 42px);
  font-weight: 900;
  letter-spacing: 0;
  line-height: 1;
}

.stat-num .hl { color: var(--qixu-primary-light); }
.stat-unit { font-size: 18px; font-weight: 600; color: var(--qixu-text-secondary); }
.stat-label { font-size: 13px; color: var(--qixu-text-muted); margin-top: var(--space-3); }


/* ═══ FLOATING THEME BUTTON (mobile) ═══ */
.fab-theme {
  position: fixed;
  bottom: var(--space-8);
  right: var(--space-8);
  z-index: 999;
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background: var(--qixu-bg-elevated);
  border: 1px solid var(--qixu-border);
  color: var(--qixu-primary-light);
  font-size: 19px;
  box-shadow: var(--shadow-lg);
  display: none;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}

.fab-theme:hover { transform: scale(1.06); }


/* ═══ RESPONSIVE BASE ═══ */
@media (max-width: 1024px) {
  .container, .container-wide { padding: 0 var(--space-6); }
  .nav-inner { padding: 0 var(--space-6); gap: var(--space-6); }
  .nav-links { gap: var(--space-6); }
}

@media (max-width: 768px) {
  .container, .container-wide { padding: 0 var(--space-5); }
  .nav-inner { padding: 0 var(--space-5); }

  .nav-links {
    display: none;
    position: absolute;
    top: var(--nav-h);
    left: 0;
    right: 0;
    flex-direction: column;
    gap: 0;
    background: var(--qixu-bg-surface);
    border-bottom: 1px solid var(--qixu-border);
    padding: var(--space-3) 0;
    box-shadow: var(--shadow-lg);
  }

  .nav-links.open { display: flex; }

  .nav-links .nav-link {
    padding: var(--space-4) var(--space-8);
    border-bottom: 1px solid var(--qixu-border);
    font-size: 15px;
  }

  .nav-actions .btn-ghost { display: none; }
  .nav-toggle { display: flex; }
  .fab-theme { display: flex; }
  .theme-switch { display: none; }

  .section { padding: var(--space-24) 0; }
  .section-lg { padding: var(--space-20) 0; }
}

@media (max-width: 480px) {
  .container, .container-wide { padding: 0 var(--space-4); }
  .section { padding: var(--space-20) 0; }
}