:root {
  --bg-body: #f9f7f4;
  --bg-card: #ffffff;
  --bg-dark: #1e2a2a;
  --bg-footer: #1e2a2a;
  --text-primary: #17202a;
  --text-secondary: #2c3e50;
  --text-muted: #3d4f5c;
  --text-inverse: #f1f5f9;
  --text-inverse-muted: #cbd5e1;
  --brand: #2f4f4f;
  --brand-light: #3e6b6b;
  --accent: #b87333;
  --border-light: #d1d9e0;
  --shadow: 0 8px 20px rgba(0, 0, 0, 0.05);
  --glass-bg: rgba(255, 255, 255, 0.55);
  --glass-border: rgba(255, 255, 255, 0.35);
  --glass-shadow: 0 8px 32px rgba(47, 79, 79, 0.12);
  --hero-gradient: linear-gradient(135deg, #e8f0f0 0%, #d4e4e4 50%, #c8dcdc 100%);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 24px;
  --radius-pill: 30px;
  --transition-fast: 0.15s ease;
  --transition-base: 0.25s ease;
  --transition-slow: 0.4s cubic-bezier(0.22, 1, 0.36, 1);
}

.dark-mode {
  --bg-body: #121c1c;
  --bg-card: #1e2a2a;
  --bg-dark: #0f1717;
  --bg-footer: #0f1717;
  --text-primary: #e5e7eb;
  --text-secondary: #e2e8f0;
  --text-muted: #a0b0b8;
  --text-inverse: #f1f5f9;
  --text-inverse-muted: #cbd5e1;
  --brand: #6a9c9c;
  --brand-light: #8ab5b5;
  --accent: #d4a373;
  --border-light: #3a4a4a;
  --shadow: 0 8px 20px rgba(0, 0, 0, 0.4);
  --glass-bg: rgba(30, 42, 42, 0.55);
  --glass-border: rgba(106, 156, 156, 0.25);
  --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.45);
  --hero-gradient: linear-gradient(135deg, #1a2a2a 0%, #122020 50%, #0f1a1a 100%);
}

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

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

body {
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", "Noto Sans", "PingFang SC", "Microsoft YaHei", sans-serif;
  background-color: var(--bg-body);
  color: var(--text-primary);
  line-height: 1.7;
  font-size: 16px;
  transition: background-color var(--transition-base), color var(--transition-base);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  color: var(--text-primary);
  font-weight: 600;
  line-height: 1.3;
  margin-bottom: 0.75em;
  transition: color var(--transition-base);
}

h1 {
  font-size: 2.2rem;
  letter-spacing: -0.01em;
}

h2 {
  font-size: 1.8rem;
  border-left: 4px solid var(--brand);
  padding-left: 0.75rem;
  margin-top: 2rem;
}

h3 {
  font-size: 1.4rem;
  color: var(--text-secondary);
  margin-top: 1.5rem;
}

h4 {
  font-size: 1.15rem;
  color: var(--text-secondary);
  font-weight: 600;
  margin-top: 1.2rem;
}

p,
li,
.text-content {
  color: var(--text-primary);
  margin-bottom: 1rem;
}

a {
  color: var(--brand);
  text-decoration: none;
  font-weight: 500;
  transition: color var(--transition-fast), border-color var(--transition-fast);
  border-bottom: 1px solid transparent;
}

a:hover {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

.text-muted,
.meta,
.date,
.read-more,
.small-note {
  color: var(--text-muted);
  font-size: 0.9rem;
}

.card,
.module,
.faq-item,
.article-card,
.testimonial-card,
.contact-card {
  position: relative;
  background-color: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  box-shadow: var(--shadow);
  color: var(--text-primary);
  transition: transform var(--transition-slow), box-shadow var(--transition-slow), border-color var(--transition-base), background-color var(--transition-base);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.card:hover,
.module:hover,
.faq-item:hover,
.article-card:hover,
.testimonial-card:hover,
.contact-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 16px 36px rgba(47, 79, 79, 0.14);
  border-color: var(--brand-light);
}

.dark-mode .card:hover,
.dark-mode .module:hover,
.dark-mode .faq-item:hover,
.dark-mode .article-card:hover,
.dark-mode .testimonial-card:hover,
.dark-mode .contact-card:hover {
  box-shadow: 0 16px 36px rgba(0, 0, 0, 0.55);
}

.navbar {
  position: sticky;
  top: 0;
  background-color: var(--glass-bg);
  backdrop-filter: blur(16px) saturate(180%);
  -webkit-backdrop-filter: blur(16px) saturate(180%);
  border-bottom: 1px solid var(--glass-border);
  padding: 0.8rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  z-index: 1000;
  box-shadow: 0 2px 16px rgba(0, 0, 0, 0.04);
  flex-wrap: wrap;
  transition: background-color var(--transition-base), border-color var(--transition-base);
}

.nav-brand {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--brand);
  letter-spacing: -0.5px;
  background: linear-gradient(135deg, var(--brand) 0%, var(--accent) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  transition: opacity var(--transition-base);
}

.nav-brand:hover {
  opacity: 0.85;
}

.nav-links {
  display: flex;
  gap: 1.8rem;
  align-items: center;
  flex-wrap: wrap;
}

.nav-links a {
  position: relative;
  color: var(--text-primary);
  font-weight: 500;
  border-bottom: none;
  padding-bottom: 2px;
}

.nav-links a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -2px;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--brand), var(--accent));
  border-radius: 2px;
  transition: width var(--transition-base);
}

.nav-links a:hover {
  color: var(--brand);
  border-bottom-color: transparent;
}

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

.btn {
  display: inline-block;
  background: linear-gradient(135deg, var(--brand) 0%, var(--brand-light) 100%);
  color: #ffffff !important;
  padding: 0.6rem 1.4rem;
  border-radius: var(--radius-pill);
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition: transform var(--transition-base), box-shadow var(--transition-base), filter var(--transition-base);
  text-decoration: none;
  border-bottom: none;
  font-size: 0.95rem;
  box-shadow: 0 4px 14px rgba(47, 79, 79, 0.25);
  position: relative;
  overflow: hidden;
}

.btn::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.25) 0%, transparent 60%);
  opacity: 0;
  transition: opacity var(--transition-base);
}

.btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 22px rgba(47, 79, 79, 0.35);
  color: #ffffff !important;
  filter: brightness(1.05);
}

.btn:hover::before {
  opacity: 1;
}

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

.btn-outline {
  background: transparent;
  border: 2px solid var(--brand);
  color: var(--brand) !important;
  box-shadow: none;
}

.btn-outline::before {
  background: linear-gradient(135deg, var(--brand) 0%, var(--brand-light) 100%);
}

.btn-outline:hover {
  background: transparent;
  color: #ffffff !important;
  border-color: var(--brand);
}

.btn-outline:hover::before {
  opacity: 1;
}

.btn-outline > * {
  position: relative;
  z-index: 1;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.grid-2,
.grid-3,
.grid-4 {
  display: grid;
  gap: 1.8rem;
}

.grid-2 {
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.grid-3 {
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}

.grid-4 {
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

.faq-item {
  margin-bottom: 1rem;
  cursor: pointer;
  transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
}

.faq-question {
  font-weight: 600;
  font-size: 1.1rem;
  color: var(--text-primary);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  user-select: none;
}

.faq-question span {
  flex-shrink: 0;
  color: var(--brand);
  transition: transform var(--transition-base);
}

.faq-answer {
  margin-top: 0.75rem;
  padding-top: 0.75rem;
  border-top: 1px solid var(--border-light);
  color: var(--text-primary);
  animation: fadeSlideDown var(--transition-slow) both;
}

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

table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
  overflow: hidden;
  border-radius: var(--radius-sm);
}

th,
td {
  border: 1px solid var(--border-light);
  padding: 0.75rem 1rem;
  text-align: left;
  color: var(--text-primary);
  transition: background-color var(--transition-base);
}

th {
  background-color: var(--bg-dark);
  color: var(--text-inverse);
  font-weight: 600;
}

tr:hover td {
  background-color: rgba(47, 79, 79, 0.04);
}

.dark-mode tr:hover td {
  background-color: rgba(106, 156, 156, 0.08);
}

footer {
  position: relative;
  background: linear-gradient(180deg, var(--bg-footer) 0%, var(--bg-dark) 100%);
  color: var(--text-inverse);
  padding: 2.5rem 0 2rem;
  margin-top: 3rem;
  overflow: hidden;
}

footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--brand), transparent);
  opacity: 0.6;
}

footer a {
  color: var(--text-inverse);
  border-bottom: 1px dotted var(--text-inverse-muted);
  transition: color var(--transition-fast), border-color var(--transition-fast);
}

footer a:hover {
  color: #ffffff;
  border-bottom-color: #ffffff;
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 2rem;
}

.footer-title {
  color: var(--text-inverse);
  font-weight: 600;
  margin-bottom: 1rem;
  font-size: 1.1rem;
}

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

.breadcrumb {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin: 1rem 0;
  animation: fadeIn var(--transition-slow) both;
}

.breadcrumb a {
  color: var(--text-muted);
}

.breadcrumb a:hover {
  color: var(--brand);
}

.hero {
  position: relative;
  background: var(--hero-gradient);
  padding: 3rem 2rem;
  border-radius: var(--radius-lg);
  margin: 2rem 0;
  color: #17202a;
  overflow: hidden;
  animation: fadeInUp 0.7s cubic-bezier(0.22, 1, 0.36, 1) both;
  isolation: isolate;
}

.hero::before {
  content: "";
  position: absolute;
  top: -60%;
  right: -10%;
  width: 420px;
  height: 420px;
  background: radial-gradient(circle, rgba(47, 79, 79, 0.18) 0%, transparent 70%);
  border-radius: 50%;
  z-index: -1;
  animation: floatBlob 12s ease-in-out infinite;
}

.hero::after {
  content: "";
  position: absolute;
  bottom: -50%;
  left: -5%;
  width: 360px;
  height: 360px;
  background: radial-gradient(circle, rgba(184, 115, 51, 0.14) 0%, transparent 70%);
  border-radius: 50%;
  z-index: -1;
  animation: floatBlob 15s ease-in-out infinite reverse;
}

@keyframes floatBlob {
  0%,
  100% {
    transform: translate(0, 0) scale(1);
  }
  50% {
    transform: translate(-20px, 20px) scale(1.08);
  }
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(24px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

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

.dark-mode .hero {
  background: var(--hero-gradient);
  color: var(--text-primary);
}

.hero h1 {
  color: #17202a;
  animation: fadeInUp 0.7s 0.1s cubic-bezier(0.22, 1, 0.36, 1) both;
}

.dark-mode .hero h1 {
  color: #f1f5f9;
}

.hero p {
  color: #2c3e50;
  animation: fadeInUp 0.7s 0.2s cubic-bezier(0.22, 1, 0.36, 1) both;
}

.dark-mode .hero p {
  color: #e2e8f0;
}

.hero .btn {
  animation: fadeInUp 0.7s 0.3s cubic-bezier(0.22, 1, 0.36, 1) both;
}

.tag {
  display: inline-block;
  background: linear-gradient(135deg, var(--brand) 0%, var(--brand-light) 100%);
  color: #ffffff;
  padding: 0.2rem 0.8rem;
  border-radius: 20px;
  font-size: 0.8rem;
  margin-right: 0.5rem;
  margin-bottom: 0.5rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.tag:hover {
  transform: translateY(-1px) scale(1.04);
  box-shadow: 0 4px 12px rgba(47, 79, 79, 0.3);
}

.mobile-menu-btn {
  display: none;
  background: var(--glass-bg);
  border: 2px solid var(--brand);
  color: var(--brand);
  font-size: 1.5rem;
  padding: 0.2rem 0.8rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  transition: background-color var(--transition-base), color var(--transition-base), transform var(--transition-base);
}

.mobile-menu-btn:hover {
  background: var(--brand);
  color: #ffffff;
  transform: scale(1.05);
}

.theme-toggle {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-pill);
  padding: 0.4rem 1rem;
  cursor: pointer;
  color: var(--text-primary);
  font-weight: 500;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  transition: transform var(--transition-base), box-shadow var(--transition-base), background-color var(--transition-base), border-color var(--transition-base);
}

.theme-toggle:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 18px rgba(47, 79, 79, 0.18);
  border-color: var(--brand);
}

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

.stat-number {
  font-size: 2.5rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--brand) 0%, var(--accent) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.stat-label {
  color: var(--text-secondary);
}

input,
textarea {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  color: var(--text-primary);
  padding: 0.7rem 1rem;
  border-radius: var(--radius-sm);
  width: 100%;
  font-family: inherit;
  font-size: 1rem;
  transition: border-color var(--transition-base), box-shadow var(--transition-base), background-color var(--transition-base);
}

input:focus,
textarea:focus {
  outline: none;
  border-color: var(--brand);
  box-shadow: 0 0 0 3px rgba(47, 79, 79, 0.15);
}

.dark-mode input:focus,
.dark-mode textarea:focus {
  box-shadow: 0 0 0 3px rgba(106, 156, 156, 0.25);
}

input::placeholder,
textarea::placeholder {
  color: var(--text-muted);
  opacity: 0.8;
}

.opacity-safe {
  opacity: 1 !important;
}

#backToTop {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  background: linear-gradient(135deg, var(--brand) 0%, var(--brand-light) 100%);
  color: #fff;
  border: none;
  border-radius: 50%;
  width: 48px;
  height: 48px;
  font-size: 1.5rem;
  cursor: pointer;
  box-shadow: 0 6px 20px rgba(47, 79, 79, 0.35);
  display: none;
  z-index: 999;
  line-height: 1;
  transition: transform var(--transition-base), box-shadow var(--transition-base), filter var(--transition-base);
  animation: fadeIn var(--transition-base) both;
}

#backToTop:hover {
  transform: translateY(-4px) scale(1.08);
  box-shadow: 0 10px 28px rgba(47, 79, 79, 0.45);
  filter: brightness(1.08);
}

#backToTop:active {
  transform: translateY(-1px) scale(1);
}

.article-card {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.article-card h3 {
  margin-top: 0.5rem;
  transition: color var(--transition-base);
}

.article-card:hover h3 {
  color: var(--brand);
}

.article-card .read-more {
  margin-top: auto;
  padding-top: 0.5rem;
  font-weight: 600;
  color: var(--brand);
  transition: color var(--transition-fast), letter-spacing var(--transition-base);
}

.article-card:hover .read-more {
  color: var(--accent);
  letter-spacing: 0.02em;
}

.testimonial-card {
  position: relative;
  padding-top: 1.8rem;
}

.testimonial-card::before {
  content: "\201C";
  position: absolute;
  top: -0.2rem;
  left: 1rem;
  font-size: 3.5rem;
  line-height: 1;
  color: var(--brand);
  opacity: 0.25;
  font-family: Georgia, serif;
}

section {
  animation: fadeInUp 0.6s cubic-bezier(0.22, 1, 0.36, 1) both;
}

section:nth-of-type(1) {
  animation-delay: 0.05s;
}
section:nth-of-type(2) {
  animation-delay: 0.1s;
}
section:nth-of-type(3) {
  animation-delay: 0.15s;
}
section:nth-of-type(4) {
  animation-delay: 0.2s;
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

@media (max-width: 768px) {
  body {
    font-size: 15px;
  }

  .navbar {
    padding: 0.8rem 1rem;
  }

  .nav-brand {
    font-size: 1.3rem;
  }

  .nav-links {
    display: none;
    width: 100%;
    flex-direction: column;
    gap: 0.8rem;
    padding: 1rem 0;
    align-items: flex-start;
    animation: fadeSlideDown var(--transition-base) both;
  }

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

  .nav-links a {
    width: 100%;
    padding: 0.4rem 0;
  }

  .mobile-menu-btn {
    display: block;
  }

  h1 {
    font-size: 1.8rem;
  }

  h2 {
    font-size: 1.5rem;
  }

  h3 {
    font-size: 1.2rem;
  }

  .hero {
    padding: 2rem 1.25rem;
    border-radius: var(--radius-md);
    margin: 1.25rem 0;
  }

  .hero::before,
  .hero::after {
    opacity: 0.6;
  }

  .container {
    padding: 0 1rem;
  }

  .grid-2,
  .grid-3,
  .grid-4 {
    gap: 1.2rem;
  }

  .card,
  .module,
  .faq-item,
  .article-card,
  .testimonial-card,
  .contact-card {
    padding: 1.2rem;
  }

  #backToTop {
    bottom: 1.2rem;
    right: 1.2rem;
    width: 44px;
    height: 44px;
    font-size: 1.3rem;
  }

  .stat-number {
    font-size: 2rem;
  }
}

@media (max-width: 480px) {
  h1 {
    font-size: 1.55rem;
  }

  h2 {
    font-size: 1.3rem;
    padding-left: 0.6rem;
  }

  .hero {
    padding: 1.5rem 1rem;
  }

  .btn {
    padding: 0.55rem 1.1rem;
    font-size: 0.9rem;
  }

  .footer-grid {
    gap: 1.5rem;
  }
}

@media (min-width: 1400px) {
  .container {
    max-width: 1280px;
  }
}

::selection {
  background: rgba(47, 79, 79, 0.25);
  color: var(--text-primary);
}

.dark-mode ::selection {
  background: rgba(106, 156, 156, 0.35);
}

::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

::-webkit-scrollbar-track {
  background: var(--bg-body);
}

::-webkit-scrollbar-thumb {
  background: var(--border-light);
  border-radius: 6px;
  border: 2px solid var(--bg-body);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--brand-light);
}