/* CSS Design Tokens for HSK API Portal */
:root {
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'Fira Code', Consolas, Monaco, 'Courier New', monospace;

  /* Color Palette - Cyber Dark & Vibrant HSK Accent */
  --bg-primary: #0a0d14;
  --bg-card: rgba(18, 24, 38, 0.75);
  --bg-card-hover: rgba(26, 35, 54, 0.85);
  --bg-input: #0f1523;
  --border-color: rgba(255, 255, 255, 0.08);
  --border-glow: rgba(99, 102, 241, 0.3);

  --text-main: #f3f4f6;
  --text-muted: #9ca3af;
  --text-dim: #6b7280;

  --accent-primary: #6366f1;
  --accent-primary-hover: #4f46e5;
  --accent-cyan: #06b6d4;
  --accent-emerald: #10b981;
  --accent-rose: #f43f5e;
  --accent-amber: #f59e0b;

  /* HSK Level Colors */
  --hsk-1: #3b82f6;
  --hsk-2: #06b6d4;
  --hsk-3: #10b981;
  --hsk-4: #eab308;
  --hsk-5: #f97316;
  --hsk-6: #ef4444;
  --hsk-7: #a855f7;
  --hsk-unknown: #64748b;

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --shadow-lg: 0 10px 30px -10px rgba(0, 0, 0, 0.5);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-main);
  line-height: 1.5;
  min-height: 100vh;
  overflow-x: hidden;
  position: relative;
}

/* Background Glow Effects */
.background-glow {
  position: fixed;
  top: -200px;
  left: 50%;
  transform: translateX(-50%);
  width: 800px;
  height: 600px;
  background: radial-gradient(circle, rgba(99, 102, 241, 0.15) 0%, rgba(6, 182, 212, 0.08) 40%, transparent 70%);
  pointer-events: none;
  z-index: 0;
}

/* Navbar */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(10, 13, 20, 0.8);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-color);
  padding: 0.75rem 1.5rem;
}

.nav-container {
  max-width: 1280px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.logo-badge {
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-cyan));
  color: #fff;
  font-weight: 800;
  font-size: 0.9rem;
  padding: 0.3rem 0.6rem;
  border-radius: var(--radius-sm);
  letter-spacing: 0.5px;
}

.brand-text {
  display: flex;
  flex-direction: column;
}

.brand-name {
  font-weight: 700;
  font-size: 1.1rem;
  color: #fff;
}

.brand-tag {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.nav-tabs {
  display: flex;
  gap: 0.5rem;
  background: rgba(255, 255, 255, 0.04);
  padding: 0.25rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
}

.tab-btn {
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-family: inherit;
  font-size: 0.85rem;
  font-weight: 500;
  padding: 0.5rem 1rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.4rem;
  transition: all 0.2s ease;
}

.tab-btn:hover {
  color: var(--text-main);
  background: rgba(255, 255, 255, 0.05);
}

.tab-btn.active {
  background: var(--accent-primary);
  color: #fff;
  box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3);
}

.status-indicator {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.8rem;
  color: var(--accent-emerald);
  text-decoration: none;
  background: rgba(16, 185, 129, 0.1);
  padding: 0.35rem 0.75rem;
  border-radius: 9999px;
  border: 1px solid rgba(16, 185, 129, 0.2);
}

.dot {
  width: 8px;
  height: 8px;
  background-color: var(--accent-emerald);
  border-radius: 50%;
}

.dot.pulse {
  box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7);
  animation: pulse-animation 2s infinite;
}

@keyframes pulse-animation {
  0% { box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7); }
  70% { box-shadow: 0 0 0 6px rgba(16, 185, 129, 0); }
  100% { box-shadow: 0 0 0 0 rgba(16, 185, 129, 0); }
}

/* Container & Layout */
.container {
  max-width: 1280px;
  margin: 2rem auto;
  padding: 0 1.5rem;
  position: relative;
  z-index: 1;
}

.hero-section {
  text-align: center;
  margin-bottom: 2rem;
}

.hero-section h1 {
  font-size: 2rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 0.5rem;
}

.subtitle {
  color: var(--text-muted);
  font-size: 0.95rem;
}

/* Tab Contents */
.tab-content {
  display: none;
}

.tab-content.active {
  display: block;
  animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Card Component */
.card {
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.card-header {
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: rgba(255, 255, 255, 0.02);
}

.card-header h3 {
  font-size: 1rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: #fff;
}

.card-body {
  padding: 1.25rem;
  flex: 1;
}

.card-footer {
  border-top: 1px solid var(--border-color);
  padding: 1rem 1.25rem;
  background: rgba(0, 0, 0, 0.2);
}

/* Playground Grid */
.playground-grid {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 1.5rem;
}

@media (max-width: 992px) {
  .playground-grid {
    grid-template-columns: 1fr;
  }
}

/* Forms & Inputs */
.form-group {
  margin-bottom: 1.25rem;
}

.form-group label {
  display: block;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-muted);
  margin-bottom: 0.4rem;
}

.input-select, .input-text, .input-textarea {
  width: 100%;
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-main);
  padding: 0.65rem 0.85rem;
  font-family: inherit;
  font-size: 0.9rem;
  transition: all 0.2s ease;
}

.input-select:focus, .input-text:focus, .input-textarea:focus {
  outline: none;
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 3px var(--border-glow);
}

.code-font {
  font-family: var(--font-mono);
}

.input-with-action {
  display: flex;
  gap: 0.5rem;
}

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

/* Buttons */
.btn-primary {
  background: var(--accent-primary);
  color: #fff;
  border: none;
  padding: 0.7rem 1.2rem;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 0.9rem;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  transition: all 0.2s ease;
}

.btn-primary:hover {
  background: var(--accent-primary-hover);
  box-shadow: 0 4px 14px rgba(99, 102, 241, 0.4);
}

.btn-block {
  width: 100%;
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  padding: 0.5rem 0.9rem;
  border-radius: var(--radius-md);
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s ease;
}

.btn-secondary:hover:not(:disabled) {
  background: rgba(255, 255, 255, 0.12);
}

.btn-secondary:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.btn-text {
  background: transparent;
  border: none;
  color: var(--accent-cyan);
  font-size: 0.85rem;
  cursor: pointer;
}

.btn-text:hover {
  text-decoration: underline;
}

.btn-icon-text {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-color);
  color: var(--text-muted);
  padding: 0.3rem 0.6rem;
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
}

.btn-icon-text:hover {
  color: var(--text-main);
  background: rgba(255, 255, 255, 0.1);
}

/* Response Section */
.response-title {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.status-chip {
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.2rem 0.6rem;
  border-radius: 9999px;
  font-family: var(--font-mono);
}

.chip-idle { background: rgba(100, 116, 139, 0.2); color: var(--hsk-unknown); }
.chip-success { background: rgba(16, 185, 129, 0.2); color: var(--accent-emerald); border: 1px solid rgba(16, 185, 129, 0.3); }
.chip-error { background: rgba(244, 63, 94, 0.2); color: var(--accent-rose); border: 1px solid rgba(244, 63, 94, 0.3); }

.response-meta {
  font-size: 0.8rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

.json-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
}

.code-block {
  background: #060911;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1rem;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: #e2e8f0;
  overflow-x: auto;
  max-height: 280px;
  white-space: pre-wrap;
  word-break: break-all;
}

/* Visual Result Flow */
.visual-result-box {
  margin-bottom: 1rem;
  padding: 0.85rem;
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
}

.visual-header {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
}

.tokens-flow {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  align-items: center;
}

.word-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0.25rem 0.55rem;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 500;
  color: #fff;
  background: rgba(255, 255, 255, 0.08);
}

.lvl-badge {
  font-size: 0.7rem;
  padding: 0.1rem 0.35rem;
  border-radius: 4px;
  background: rgba(0, 0, 0, 0.3);
  font-family: var(--font-mono);
}

/* Code Snippets Section */
.code-snippet-section {
  background: #04070e;
}

.snippet-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.75rem;
  flex-wrap: wrap;
  gap: 0.5rem;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.lang-selector {
  display: flex;
  gap: 0.25rem;
  background: rgba(255, 255, 255, 0.04);
  padding: 0.2rem;
  border-radius: var(--radius-sm);
}

.lang-btn {
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-size: 0.75rem;
  padding: 0.25rem 0.6rem;
  border-radius: 4px;
  cursor: pointer;

}

.lang-btn.active {
  background: rgba(255, 255, 255, 0.15);
  color: #fff;
}

.snippet-body {
  position: relative;
}

.btn-copy-floating {
  position: absolute;
  top: 0.5rem;
  right: 0.5rem;
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  padding: 0.25rem 0.5rem;
  border-radius: 4px;
  font-size: 0.75rem;
  cursor: pointer;
  z-index: 2;
}

.btn-copy-floating:hover {
  background: rgba(255, 255, 255, 0.2);
}

/* Docs Tab Styling */
.docs-container {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  max-width: 960px;
  margin: 0 auto;
}

.doc-card {
  padding: 1.5rem;
}

.doc-card h2 {
  font-size: 1.25rem;
  margin-bottom: 1rem;
  color: #fff;
}

.auth-methods {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1rem;
  margin: 1rem 0;
}

.auth-box {
  background: rgba(0, 0, 0, 0.3);
  padding: 1rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
}

.auth-box h4 {
  font-size: 0.9rem;
  color: var(--accent-cyan);
  margin-bottom: 0.4rem;
}

.doc-alert {
  padding: 0.85rem 1rem;
  border-radius: var(--radius-md);
  font-size: 0.85rem;
  margin-top: 1rem;
}

.alert-info {
  background: rgba(6, 182, 212, 0.1);
  border: 1px solid rgba(6, 182, 212, 0.2);
  color: #c7d2fe;
}

.doc-endpoint-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1rem;
}

.badge {
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.2rem 0.5rem;
  border-radius: 4px;
  font-family: var(--font-mono);
}

.badge-post { background: var(--accent-primary); color: #fff; }
.badge-get { background: var(--accent-emerald); color: #fff; }

.endpoint-desc {
  color: var(--text-muted);
  font-size: 0.9rem;
}

.doc-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 0.5rem;
  margin-bottom: 1.25rem;
  font-size: 0.85rem;
}

.doc-table th, .doc-table td {
  padding: 0.6rem 0.8rem;
  text-align: left;
  border-bottom: 1px solid var(--border-color);
}

.doc-table th {
  color: var(--text-muted);
  font-weight: 600;
  background: rgba(255, 255, 255, 0.02);
}

/* Web App Tab Styling */
.legend-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  justify-content: center;
  margin-bottom: 1.5rem;
}

.legend-chip {
  font-size: 0.8rem;
  padding: 0.25rem 0.65rem;
  border-radius: 9999px;
  font-weight: 500;
  color: #fff;
}

/* HSK Level Tag Colors */
.level-1 { background-color: var(--hsk-1); }
.level-2 { background-color: var(--hsk-2); }
.level-3 { background-color: var(--hsk-3); }
.level-4 { background-color: var(--hsk-4); color: #000; }
.level-5 { background-color: var(--hsk-5); }
.level-6 { background-color: var(--hsk-6); }
.level-7 { background-color: var(--hsk-7); }
.unknown-chip { background-color: var(--hsk-unknown); }

.workspace-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
}

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

.actions-bar {
  display: flex;
  gap: 0.75rem;
  margin-top: 1rem;
}

.header-right {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.status-text {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.web-output-box {
  min-height: 250px;
  padding: 1rem;
  background: rgba(0, 0, 0, 0.2);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  line-height: 2;
  font-size: 1rem;
}

.web-output-box.empty {
  color: var(--text-dim);
  display: flex;
  align-items: center;
  justify-content: center;
}

.hidden {
  display: none !important;
}

/* Footer */
.footer {
  margin-top: 4rem;
  border-top: 1px solid var(--border-color);
  padding: 1.5rem 0;
  text-align: center;
  color: var(--text-dim);
  font-size: 0.8rem;
}