/* ============================================================
   康泓中醫診所 - No-Slop UI Design System
   Palette: Cloud Canvas Light
   bg: #fafafa | surface: #ffffff | primary: #2563eb | accent: #dc2626 | text: #0f172a
   Font: Noto Sans TC via Google Fonts
   ============================================================ */

/* --- CSS Custom Properties --- */
:root {
  --color-bg: #fafafa;
  --color-surface: #ffffff;
  --color-primary: #2563eb;
  --color-primary-hover: #1d4ed8;
  --color-accent: #dc2626;
  --color-text: #0f172a;
  --color-text-secondary: #475569;
  --color-text-muted: #94a3b8;
  --color-border: #e2e8f0;
  --color-border-strong: #cbd5e1;
  --color-ring: #2563eb;

  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-full: 9999px;

  --shadow-sm: 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md: 0 2px 8px rgba(0,0,0,0.06);
  --shadow-lg: 0 4px 16px rgba(0,0,0,0.08);

  --font-sans: 'Noto Sans TC', -apple-system, BlinkMacSystemFont, 'Helvetica Neue', sans-serif;
  --font-mono: 'SF Mono', 'Fira Code', 'Cascadia Code', monospace;

  --nav-height: 64px;
  --max-width: 1200px;

  --transition-fast: 150ms ease;
  --transition-base: 200ms ease;
}

/* --- Reset & Base --- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img {
  display: block;
  max-width: 100%;
  height: auto;
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--color-primary-hover);
}

ul, ol {
  list-style: none;
}

/* --- Typography --- */
h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  line-height: 1.3;
  color: var(--color-text);
}

h1 { font-size: 2.5rem; letter-spacing: -0.02em; }
h2 { font-size: 2rem; letter-spacing: -0.01em; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }

p {
  color: var(--color-text-secondary);
  max-width: 65ch;
}

.text-muted { color: var(--color-text-muted); }
.text-small { font-size: 0.875rem; }

/* --- Layout --- */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: 80px 0;
}

.section-tight {
  padding: 48px 0;
}

.section-header {
  margin-bottom: 48px;
}

.section-header h2 {
  margin-bottom: 12px;
}

.section-header p {
  font-size: 1.125rem;
}

/* --- Navigation --- */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  height: var(--nav-height);
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  display: flex;
  align-items: center;
}

.nav .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.nav-brand {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-text);
  letter-spacing: -0.01em;
  white-space: nowrap;
}

.nav-brand:hover {
  color: var(--color-primary);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav-links a {
  display: inline-flex;
  align-items: center;
  padding: 8px 16px;
  font-size: 0.938rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  border-radius: var(--radius-sm);
  transition: background var(--transition-fast), color var(--transition-fast);
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--color-text);
  background: #f1f5f9;
}

.nav-links a.cta-nav {
  color: var(--color-surface);
  background: var(--color-primary);
  margin-left: 8px;
  padding: 8px 20px;
  border-radius: var(--radius-md);
  font-weight: 600;
}

.nav-links a.cta-nav:hover {
  background: var(--color-primary-hover);
  color: var(--color-surface);
}

/* Mobile nav toggle */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 8px;
  background: none;
  border: none;
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-text);
  border-radius: 1px;
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 28px;
  font-family: var(--font-sans);
  font-size: 0.938rem;
  font-weight: 600;
  line-height: 1;
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: background var(--transition-fast), border-color var(--transition-fast), color var(--transition-fast);
  white-space: nowrap;
  text-decoration: none;
}

.btn-primary {
  background: var(--color-primary);
  color: #ffffff;
  border-color: var(--color-primary);
}

.btn-primary:hover {
  background: var(--color-primary-hover);
  border-color: var(--color-primary-hover);
  color: #ffffff;
}

.btn-outline {
  background: transparent;
  color: var(--color-text);
  border-color: var(--color-border-strong);
}

.btn-outline:hover {
  background: #f1f5f9;
  border-color: var(--color-text-secondary);
  color: var(--color-text);
}

.btn-white {
  background: #ffffff;
  color: var(--color-text);
  border-color: #ffffff;
}

.btn-white:hover {
  background: #f1f5f9;
  border-color: #f1f5f9;
}

.btn-sm {
  padding: 8px 16px;
  font-size: 0.875rem;
}

/* --- Cards --- */
.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: box-shadow var(--transition-base);
}

.card:hover {
  box-shadow: var(--shadow-md);
}

.card-img {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
}

.card-body {
  padding: 24px;
}

.card-date {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  margin-bottom: 8px;
}

.card h3 {
  font-size: 1.25rem;
  margin-bottom: 8px;
}

.card p {
  font-size: 0.938rem;
  line-height: 1.6;
}

/* --- Forms --- */
.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  margin-bottom: 6px;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text);
}

.form-input,
.form-textarea {
  width: 100%;
  padding: 10px 14px;
  font-family: var(--font-sans);
  font-size: 0.938rem;
  color: var(--color-text);
  background: var(--color-surface);
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-md);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
  outline: none;
}

.form-input:focus,
.form-textarea:focus {
  border-color: var(--color-ring);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.12);
}

.form-input::placeholder,
.form-textarea::placeholder {
  color: var(--color-text-muted);
}

.form-textarea {
  min-height: 120px;
  resize: vertical;
}

/* --- Hero --- */
.hero {
  position: relative;
  min-height: 70vh;
  display: flex;
  align-items: center;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  z-index: 0;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to bottom, rgba(15,23,42,0.55), rgba(15,23,42,0.7));
  z-index: 1;
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 640px;
}

.hero-content h1 {
  font-size: 2.75rem;
  font-weight: 700;
  color: #ffffff;
  letter-spacing: -0.02em;
  margin-bottom: 16px;
  line-height: 1.2;
}

.hero-content p {
  font-size: 1.125rem;
  color: rgba(255,255,255,0.85);
  margin-bottom: 32px;
  max-width: 520px;
}

/* --- Service Cards --- */
.service-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: box-shadow var(--transition-base);
}

.service-card:hover {
  box-shadow: var(--shadow-md);
}

.service-card-img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.service-card-body {
  padding: 24px;
}

.service-card-body h3 {
  font-size: 1.25rem;
  margin-bottom: 8px;
}

.service-card-body p {
  font-size: 0.938rem;
  line-height: 1.6;
}

/* --- Blog Cards --- */
.blog-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: box-shadow var(--transition-base);
}

.blog-card:hover {
  box-shadow: var(--shadow-md);
}

.blog-card-img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.blog-card-body {
  padding: 24px;
}

.blog-card-body .date {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  margin-bottom: 8px;
}

.blog-card-body h3 {
  font-size: 1.25rem;
  margin-bottom: 8px;
}

.blog-card-body h3 a {
  color: var(--color-text);
}

.blog-card-body h3 a:hover {
  color: var(--color-primary);
}

.blog-card-body .excerpt {
  font-size: 0.938rem;
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin-bottom: 12px;
}

.blog-card-body .read-more {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-primary);
}

.blog-card-body .read-more:hover {
  color: var(--color-primary-hover);
}

/* --- Footer --- */
.footer {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  padding: 64px 0 32px;
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 48px;
  margin-bottom: 48px;
}

.footer h4 {
  font-size: 0.938rem;
  font-weight: 600;
  margin-bottom: 16px;
  color: var(--color-text);
}

.footer p,
.footer a {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  line-height: 2;
}

.footer a:hover {
  color: var(--color-primary);
}

.footer-bottom {
  border-top: 1px solid var(--color-border);
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.footer-bottom p {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
}

/* --- Why Choose Us --- */
.why-us {
  position: relative;
  overflow: hidden;
}

.why-us-bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  z-index: 0;
}

.why-us-overlay {
  position: absolute;
  inset: 0;
  background: rgba(15,23,42,0.8);
  z-index: 1;
}

.why-us-content {
  position: relative;
  z-index: 2;
  color: #ffffff;
}

.why-us-content h2,
.why-us-content h3,
.why-us-content p {
  color: #ffffff;
}

/* --- Mission Section --- */
.mission {
  text-align: center;
}

.mission h2 {
  margin-bottom: 16px;
}

.mission-text {
  font-size: 1.125rem;
  max-width: 680px;
  margin: 0 auto;
  color: var(--color-text-secondary);
}

/* --- Collaboration Logos --- */
.logo-slider {
  overflow: hidden;
  padding: 24px 0;
}

.logo-track {
  display: flex;
  gap: 64px;
  animation: logo-slide 30s linear infinite;
  width: max-content;
}

.logo-track:hover {
  animation-play-state: paused;
}

@keyframes logo-slide {
  0% { transform: translateX(0); }
  100% { transform: translateX(-50%); }
}

.logo-item {
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--color-text-muted);
  white-space: nowrap;
  padding: 12px 24px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  min-width: 160px;
}

/* --- News Section --- */
.news-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

/* --- Contact Section --- */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
}

.contact-info-item {
  display: flex;
  gap: 12px;
  margin-bottom: 20px;
}

.contact-info-item .label {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 2px;
}

.contact-info-item .value {
  font-size: 0.938rem;
  color: var(--color-text-secondary);
}

/* --- Opening Hours --- */
.hours-table {
  width: 100%;
  border-collapse: collapse;
}

.hours-table th,
.hours-table td {
  padding: 10px 16px;
  text-align: left;
  border-bottom: 1px solid var(--color-border);
  font-size: 0.938rem;
}

.hours-table th {
  font-weight: 600;
  color: var(--color-text);
  background: #f8fafc;
}

.hours-table td {
  color: var(--color-text-secondary);
}

/* --- Map --- */
.map-container {
  width: 100%;
  aspect-ratio: 16 / 9;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.map-container iframe {
  width: 100%;
  height: 100%;
  border: 0;
}

/* --- Pagination --- */
.pagination {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  margin-top: 48px;
}

.pagination button {
  padding: 8px 16px;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.pagination button:hover:not(:disabled) {
  background: #f1f5f9;
  border-color: var(--color-border-strong);
}

.pagination button.active {
  background: var(--color-primary);
  color: #ffffff;
  border-color: var(--color-primary);
}

.pagination button:disabled {
  opacity: 0.4;
  cursor: default;
}

/* --- Blog Post Single --- */
.blog-post {
  max-width: 720px;
  margin: 0 auto;
}

.blog-post-header {
  margin-bottom: 32px;
}

.blog-post-header .date {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  margin-bottom: 8px;
}

.blog-post-header h1 {
  font-size: 2.25rem;
  margin-bottom: 16px;
}

.blog-post-featured {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border-radius: var(--radius-lg);
  margin-bottom: 32px;
}

.blog-post-body {
  font-size: 1.0625rem;
  line-height: 1.8;
  color: var(--color-text-secondary);
}

.blog-post-body p {
  margin-bottom: 20px;
}

/* --- Practitioners --- */
.practitioner-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.practitioner-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.practitioner-img {
  width: 100%;
  aspect-ratio: 3 / 4;
  object-fit: cover;
}

.practitioner-body {
  padding: 20px;
  text-align: center;
}

.practitioner-body h3 {
  font-size: 1.125rem;
  margin-bottom: 4px;
}

.practitioner-body .role {
  font-size: 0.875rem;
  color: var(--color-primary);
  font-weight: 500;
  margin-bottom: 8px;
}

.practitioner-body .bio {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  line-height: 1.5;
}

/* --- Back link --- */
.back-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text-muted);
  margin-bottom: 24px;
  transition: color var(--transition-fast);
}

.back-link:hover {
  color: var(--color-text);
}

.back-link::before {
  content: "←";
  font-size: 1rem;
}

/* --- Utility --- */
.text-center { text-align: center; }
.mt-16 { margin-top: 16px; }
.mt-24 { margin-top: 24px; }
.mt-32 { margin-top: 32px; }
.mt-48 { margin-top: 48px; }
.mb-8 { margin-bottom: 8px; }
.mb-16 { margin-bottom: 16px; }
.mb-24 { margin-bottom: 24px; }
.mb-32 { margin-bottom: 32px; }
.mb-48 { margin-bottom: 48px; }
.hidden { display: none !important; }

/* --- Error / Success states --- */
.form-success {
  display: none;
  padding: 16px;
  background: #f0fdf4;
  border: 1px solid #bbf7d0;
  border-radius: var(--radius-md);
  color: #166534;
  font-size: 0.938rem;
  margin-top: 16px;
}

.form-success.visible {
  display: block;
}

.form-error {
  padding: 16px;
  background: #fef2f2;
  border: 1px solid #fecaca;
  border-radius: var(--radius-md);
  color: #991b1b;
  font-size: 0.875rem;
  margin-top: 16px;
}

/* --- Responsive --- */
@media (max-width: 1024px) {
  .news-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: repeat(2, 1fr); }
  .practitioner-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
    position: absolute;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    flex-direction: column;
    padding: 16px;
    gap: 4px;
    box-shadow: var(--shadow-md);
  }

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

  .nav-links a.cta-nav {
    margin-left: 0;
    margin-top: 8px;
  }

  .nav-toggle {
    display: flex;
  }

  .hero-content h1 { font-size: 2rem; }
  .hero-content p { font-size: 1rem; }

  .section { padding: 56px 0; }

  .news-grid { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
  .footer-bottom { flex-direction: column; gap: 8px; text-align: center; }
  .practitioner-grid { grid-template-columns: 1fr; }

  .blog-post-header h1 { font-size: 1.75rem; }
}

@media (max-width: 480px) {
  .container { padding: 0 16px; }
  .hero { min-height: 60vh; }
  .hero-content h1 { font-size: 1.75rem; }
  h2 { font-size: 1.5rem; }
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  .logo-track { animation: none; }
  * { transition-duration: 0s !important; }
}