/* ============================================================
   SZR Design System — main.css
   Single source of truth for all styles
   ============================================================ */

/* ── CSS Custom Properties ── */
:root {
  /* Brand */
  --color-primary:       #008040;
  --color-primary-dark:  #006633;
  --color-primary-light: #e8f5ee;

  /* Neutrals */
  --color-text:          #1a1a1a;
  --color-text-muted:    #6b7280;
  --color-border:        #e5e7eb;
  --color-bg:            #ffffff;
  --color-bg-subtle:     #f9fafb;
  --color-bg-dark:       #111827;

  /* Semantic */
  --color-success:       #2e7d32;
  --color-warning:       #f57c00;
  --color-danger:        #c62828;
  --color-info:          #1565c0;

  /* Spacing scale */
  --space-1:  0.25rem;
  --space-2:  0.5rem;
  --space-3:  0.75rem;
  --space-4:  1rem;
  --space-6:  1.5rem;
  --space-8:  2rem;
  --space-12: 3rem;
  --space-16: 4rem;

  /* Typography scale */
  --text-xs:   0.75rem;
  --text-sm:   0.875rem;
  --text-base: 1rem;
  --text-lg:   1.125rem;
  --text-xl:   1.25rem;
  --text-2xl:  1.5rem;
  --text-3xl:  1.875rem;
  --text-4xl:  2.25rem;

  /* Border radius */
  --radius-sm:   4px;
  --radius-md:   8px;
  --radius-lg:   12px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.10);
  --shadow-lg: 0 8px 24px rgba(0,0,0,0.14);

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 200ms ease;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: "Helvetica Neue", Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  font-size: var(--text-base);
}

a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
button { cursor: pointer; font-family: inherit; }
ul { list-style: none; }

/* ── Container ── */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-4);
}

/* ── Typography utilities ── */
.text-xs   { font-size: var(--text-xs); }
.text-sm   { font-size: var(--text-sm); }
.text-base { font-size: var(--text-base); }
.text-lg   { font-size: var(--text-lg); }
.text-xl   { font-size: var(--text-xl); }
.text-2xl  { font-size: var(--text-2xl); }
.text-3xl  { font-size: var(--text-3xl); }
.text-4xl  { font-size: var(--text-4xl); }

.font-medium { font-weight: 500; }
.font-semibold { font-weight: 600; }
.font-bold { font-weight: 700; }

.text-muted   { color: var(--color-text-muted); }
.text-primary { color: var(--color-primary); }
.text-center  { text-align: center; }
.text-right   { text-align: right; }

/* ── Flex utilities ── */
.flex         { display: flex; }
.flex-col     { display: flex; flex-direction: column; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.justify-center  { justify-content: center; }
.gap-2  { gap: var(--space-2); }
.gap-4  { gap: var(--space-4); }
.gap-6  { gap: var(--space-6); }
.flex-1 { flex: 1; }
.flex-wrap { flex-wrap: wrap; }

/* ── Spacing utilities ── */
.mt-4  { margin-top: var(--space-4); }
.mt-8  { margin-top: var(--space-8); }
.mb-4  { margin-bottom: var(--space-4); }
.mb-6  { margin-bottom: var(--space-6); }
.mb-8  { margin-bottom: var(--space-8); }
.p-4   { padding: var(--space-4); }
.p-6   { padding: var(--space-6); }
.py-2  { padding-top: var(--space-2); padding-bottom: var(--space-2); }
.px-4  { padding-left: var(--space-4); padding-right: var(--space-4); }

/* ── Buttons ── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: 0.625rem var(--space-6);
  border-radius: var(--radius-md);
  font-size: var(--text-base);
  font-weight: 500;
  border: 2px solid transparent;
  transition: background var(--transition-base), color var(--transition-base),
              border-color var(--transition-base), box-shadow var(--transition-base);
  min-height: 44px;
  white-space: nowrap;
}
.btn-primary {
  background: var(--color-primary);
  color: #fff;
  border-color: var(--color-primary);
}
.btn-primary:hover {
  background: var(--color-primary-dark);
  border-color: var(--color-primary-dark);
}
.btn-outline {
  background: transparent;
  color: var(--color-primary);
  border-color: var(--color-primary);
}
.btn-outline:hover {
  background: var(--color-primary-light);
}
.btn-sm {
  padding: 0.375rem var(--space-4);
  font-size: var(--text-sm);
  min-height: 36px;
}
.btn-danger {
  background: var(--color-danger);
  color: #fff;
  border-color: var(--color-danger);
}
.btn-danger:hover { background: #a31515; border-color: #a31515; }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }

/* ── Badges ── */
.badge {
  display: inline-block;
  padding: 0.2rem 0.55rem;
  border-radius: var(--radius-sm);
  font-size: var(--text-xs);
  font-weight: 600;
  line-height: 1.4;
}
.badge-easy     { background: #dcfce7; color: #166534; }
.badge-moderate { background: #fff7ed; color: #9a3412; }
.badge-hard     { background: #fee2e2; color: #991b1b; }
.badge-expert   { background: #fee2e2; color: #991b1b; }

/* ── Cards ── */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--space-8);
}
.card {
  background: var(--color-bg);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-base), box-shadow var(--transition-base);
  display: block;
  color: inherit;
}
.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}
.card-img-container {
  position: relative;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: var(--color-bg-subtle);
}
.card-img-container img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}
.card:hover .card-img-container img { transform: scale(1.03); }
.card-img-placeholder {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-border);
  font-size: 3rem;
}
.card-content { padding: var(--space-4); }
.card-region  { font-size: var(--text-xs); color: var(--color-text-muted); margin-bottom: var(--space-1); text-transform: uppercase; letter-spacing: 0.05em; }
.card-title   { font-size: var(--text-lg); font-weight: 600; margin-bottom: var(--space-2); line-height: 1.35; }
.card-meta    { display: flex; flex-wrap: wrap; gap: var(--space-2) var(--space-4); font-size: var(--text-sm); color: var(--color-text-muted); margin-top: var(--space-2); }
.card-meta i  { color: var(--color-primary); margin-right: var(--space-1); }

/* Bookmark button on card */
.bookmark-btn {
  position: absolute;
  top: var(--space-3);
  right: var(--space-3);
  width: 34px;
  height: 34px;
  background: rgba(255,255,255,0.92);
  border: none;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-sm);
  transition: background var(--transition-fast), color var(--transition-fast);
  color: var(--color-text-muted);
  z-index: 1;
}
.bookmark-btn:hover { background: #fff; color: var(--color-primary); }
.bookmark-btn.active { color: var(--color-primary); }

/* ── Navbar ── */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
}
.navbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
  gap: var(--space-6);
}
.navbar-brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  flex-shrink: 0;
}
.navbar-logo {
  width: 40px;
  height: 40px;
  background: var(--color-primary);
  color: #fff;
  font-weight: 700;
  font-size: var(--text-base);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  letter-spacing: -0.5px;
}
.navbar-brand-text {
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--color-primary);
}
.navbar-search {
  flex: 1;
  max-width: 400px;
  position: relative;
}
.navbar-search input {
  width: 100%;
  padding: 0.5rem var(--space-4) 0.5rem 2.5rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  font-size: var(--text-sm);
  background: var(--color-bg-subtle);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}
.navbar-search input:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(0,128,64,0.12);
  background: var(--color-bg);
}
.navbar-search-icon {
  position: absolute;
  left: 0.75rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--color-text-muted);
  font-size: var(--text-sm);
  pointer-events: none;
}
.navbar-nav {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}
.nav-link {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  padding: 0.4rem var(--space-3);
  border-radius: var(--radius-sm);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-muted);
  transition: color var(--transition-fast), background var(--transition-fast);
  min-height: 44px;
  white-space: nowrap;
}
.nav-link:hover { color: var(--color-primary); background: var(--color-primary-light); }
.nav-link.active { color: var(--color-primary); font-weight: 600; }
.nav-link.active::after {
  content: '';
  display: block;
  height: 2px;
  background: var(--color-primary);
  border-radius: 1px;
  margin-top: 2px;
}
.nav-link-btn {
  background: var(--color-primary);
  color: #fff !important;
  border-radius: var(--radius-md);
  padding: 0.4rem var(--space-4);
}
.nav-link-btn:hover { background: var(--color-primary-dark) !important; color: #fff !important; }
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  padding: var(--space-2);
  min-height: 44px;
  justify-content: center;
}
.hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: transform var(--transition-base), opacity var(--transition-base);
}

/* ── Filter Bar ── */
.filter-bar {
  display: flex;
  gap: var(--space-2);
  flex-wrap: wrap;
  margin-bottom: var(--space-6);
}
.filter-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: 0.45rem var(--space-4);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  background: var(--color-bg);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-muted);
  transition: all var(--transition-fast);
  min-height: 44px;
}
.filter-btn:hover { border-color: var(--color-primary); color: var(--color-primary); background: var(--color-primary-light); }
.filter-btn.active { background: var(--color-primary); color: #fff; border-color: var(--color-primary); }

/* ── Hero Section ── */
.hero {
  position: relative;
  min-height: 480px;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  border-radius: var(--radius-lg);
  overflow: hidden;
  margin-bottom: var(--space-12);
  background: #1a2e1a;
}
.hero-bg {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  opacity: 0.55;
}
.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to bottom, rgba(0,0,0,0.3) 0%, rgba(0,0,0,0.55) 100%);
}
.hero-content {
  position: relative;
  z-index: 1;
  color: #fff;
  padding: var(--space-16) var(--space-8);
  max-width: 640px;
}
.hero-content h1 {
  font-size: var(--text-4xl);
  font-weight: 700;
  margin-bottom: var(--space-4);
  text-shadow: 0 2px 8px rgba(0,0,0,0.4);
  line-height: 1.2;
}
.hero-content p {
  font-size: var(--text-lg);
  opacity: 0.9;
  margin-bottom: var(--space-8);
  text-shadow: 0 1px 4px rgba(0,0,0,0.3);
}

/* ── Flash Messages ── */
.flash-messages { padding: var(--space-4) 0 0; }
.flash {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-3);
  font-size: var(--text-sm);
  font-weight: 500;
}
.flash-success { background: #dcfce7; color: #166534; border: 1px solid #bbf7d0; }
.flash-error   { background: #fee2e2; color: #991b1b; border: 1px solid #fecaca; }
.flash-info    { background: #dbeafe; color: #1e40af; border: 1px solid #bfdbfe; }
.flash-warning { background: #fff7ed; color: #9a3412; border: 1px solid #fed7aa; }
.flash-close {
  background: none;
  border: none;
  font-size: var(--text-lg);
  line-height: 1;
  opacity: 0.6;
  padding: 0 var(--space-1);
  color: inherit;
}
.flash-close:hover { opacity: 1; }

/* ── Auth Card ── */
.auth-page {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-bg-subtle);
  padding: var(--space-8) var(--space-4);
}
.auth-card {
  background: var(--color-bg);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  padding: var(--space-12) var(--space-8);
  width: 100%;
  max-width: 420px;
}
.auth-logo {
  text-align: center;
  margin-bottom: var(--space-8);
}
.auth-logo-icon {
  width: 56px;
  height: 56px;
  background: var(--color-primary);
  color: #fff;
  font-size: var(--text-xl);
  font-weight: 700;
  border-radius: var(--radius-md);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-3);
}
.auth-logo-text {
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-primary);
}
.auth-title {
  text-align: center;
  font-size: var(--text-2xl);
  font-weight: 600;
  margin-bottom: var(--space-8);
  color: var(--color-text);
}

/* ── Form Elements ── */
.form-group { margin-bottom: var(--space-6); }
.form-label {
  display: block;
  margin-bottom: var(--space-2);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text);
}
.form-input, .form-select, .form-textarea {
  width: 100%;
  padding: 0.625rem var(--space-4);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: var(--text-base);
  font-family: inherit;
  color: var(--color-text);
  background: var(--color-bg);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
  min-height: 44px;
}
.form-input:focus, .form-select:focus, .form-textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(0,128,64,0.12);
}
.form-input::placeholder { color: var(--color-text-muted); }
.form-textarea { resize: vertical; min-height: 100px; }

/* ── Profile Page ── */
.profile-header {
  display: flex;
  align-items: center;
  gap: var(--space-6);
  background: var(--color-bg-subtle);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-8);
  margin-bottom: var(--space-8);
}
.avatar-circle {
  width: 80px;
  height: 80px;
  border-radius: var(--radius-full);
  background: var(--color-primary);
  color: #fff;
  font-size: var(--text-3xl);
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.profile-info h1 { font-size: var(--text-2xl); font-weight: 700; margin-bottom: var(--space-1); }
.profile-info p  { font-size: var(--text-sm); color: var(--color-text-muted); }

/* ── Section ── */
.section { margin-bottom: var(--space-12); }
.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-6);
  padding-bottom: var(--space-4);
  border-bottom: 2px solid var(--color-border);
}
.section-title { font-size: var(--text-xl); font-weight: 600; }

/* ── Empty State ── */
.empty-state {
  text-align: center;
  padding: var(--space-16) var(--space-8);
  color: var(--color-text-muted);
}
.empty-state i { font-size: 3rem; margin-bottom: var(--space-4); opacity: 0.4; display: block; }
.empty-state p { margin-bottom: var(--space-4); font-size: var(--text-lg); }

/* ── Result info ── */
.result-info { font-size: var(--text-sm); color: var(--color-text-muted); margin-bottom: var(--space-6); }

/* ── Page header ── */
.page-header { margin-bottom: var(--space-8); padding: var(--space-8) 0 var(--space-6); }
.page-header h1 { font-size: var(--text-3xl); font-weight: 700; }
.page-header p  { color: var(--color-text-muted); margin-top: var(--space-2); }

/* ── Footer ── */
.footer {
  background: var(--color-bg-dark);
  color: rgba(255,255,255,0.7);
  padding: var(--space-12) 0 var(--space-8);
  margin-top: var(--space-16);
}
.footer-inner {
  display: flex;
  justify-content: space-between;
  gap: var(--space-8);
  flex-wrap: wrap;
  margin-bottom: var(--space-8);
}
.footer-brand .navbar-logo { background: rgba(255,255,255,0.15); }
.footer-brand-text { color: #fff; font-size: var(--text-lg); font-weight: 700; margin-top: var(--space-3); }
.footer-brand p { font-size: var(--text-sm); margin-top: var(--space-2); max-width: 240px; }
.footer-links h4 { color: #fff; font-size: var(--text-sm); font-weight: 600; margin-bottom: var(--space-4); text-transform: uppercase; letter-spacing: 0.08em; }
.footer-links ul { display: flex; flex-direction: column; gap: var(--space-2); }
.footer-links a { font-size: var(--text-sm); transition: color var(--transition-fast); }
.footer-links a:hover { color: #fff; }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding-top: var(--space-6);
  text-align: center;
  font-size: var(--text-sm);
}

/* ── Map section ── */
.map-section { border-radius: var(--radius-lg); overflow: hidden; margin-bottom: var(--space-8); }
#map { width: 100%; height: 380px; }

/* ── Divider ── */
.divider {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  color: var(--color-text-muted);
  font-size: var(--text-sm);
  margin: var(--space-6) 0;
}
.divider::before, .divider::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--color-border);
}

/* ── Social login buttons ── */
.btn-wechat { background: #07c160; color: #fff; border-color: #07c160; }
.btn-wechat:hover { background: #059a4c; border-color: #059a4c; }
.btn-qq { background: #12b7f5; color: #fff; border-color: #12b7f5; }
.btn-qq:hover { background: #0d9fd8; border-color: #0d9fd8; }

/* ── Responsive ── */
@media (max-width: 768px) {
  .navbar-search { display: none; }
  .navbar-nav { display: none; flex-direction: column; position: absolute; top: 64px; left: 0; right: 0; background: var(--color-bg); border-bottom: 1px solid var(--color-border); padding: var(--space-4); gap: var(--space-1); box-shadow: var(--shadow-md); }
  .navbar-nav.open { display: flex; }
  .navbar { position: relative; }
  .hamburger { display: flex; }
  .nav-link { min-height: 48px; padding: var(--space-3) var(--space-4); border-radius: var(--radius-md); }
  .hero-content h1 { font-size: var(--text-2xl); }
  .hero-content p  { font-size: var(--text-base); }
  .hero { min-height: 320px; }
  .cards-grid { grid-template-columns: 1fr; gap: var(--space-6); }
  .profile-header { flex-direction: column; text-align: center; }
  .footer-inner { flex-direction: column; }
  .auth-card { padding: var(--space-8) var(--space-6); }
}

@media (max-width: 600px) {
  .cards-grid { grid-template-columns: 1fr; }
  .filter-bar { gap: var(--space-2); }
  .filter-btn { font-size: var(--text-xs); padding: 0.4rem var(--space-3); }
}