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

:root {
  --color-primary: #6b4e2e;
  --color-secondary: #d4a862;
  --color-accent: #7aa777;
  --color-text: #2d2d2d;
  --color-text-light: #666;
  --color-bg: #ffffff;
  --color-bg-alt: #faf8f5;
  --color-border: #eaeaea;
  --color-card: #ffffff;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 30px rgba(0, 0, 0, 0.08);
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --container-width: 1100px;
  --nav-height: 72px;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.7;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color 0.2s ease;
}

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

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

.container {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* ========== Header & Nav ========== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-border);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--nav-height);
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 20px;
  color: var(--color-primary);
  letter-spacing: 0.5px;
}

.nav-logo img {
  height: 40px;
  width: auto;
}

.nav-links {
  display: flex;
  list-style: none;
  gap: 8px;
}

.nav-links a {
  display: block;
  padding: 8px 18px;
  border-radius: var(--radius-sm);
  color: var(--color-text);
  font-size: 15px;
  font-weight: 500;
  transition: all 0.2s ease;
}

.nav-links a:hover,
.nav-links a.active {
  background: var(--color-bg-alt);
  color: var(--color-primary);
}

/* ========== Hero Section ========== */
.hero {
  background: linear-gradient(135deg, #faf8f5 0%, #f5f0e8 100%);
  padding: 80px 0 72px;
  border-bottom: 1px solid var(--color-border);
}

.hero-content {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 56px;
  align-items: center;
}

.hero-tag {
  display: inline-block;
  padding: 6px 14px;
  background: rgba(212, 168, 98, 0.12);
  color: var(--color-secondary);
  border-radius: 999px;
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 20px;
  letter-spacing: 0.5px;
}

.hero h1 {
  font-size: 40px;
  line-height: 1.25;
  color: var(--color-primary);
  margin-bottom: 20px;
  font-weight: 700;
}

.hero-subtitle {
  font-size: 18px;
  color: var(--color-text-light);
  line-height: 1.8;
  margin-bottom: 32px;
  max-width: 480px;
}

.hero-actions {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 28px;
  border-radius: var(--radius-sm);
  font-size: 15px;
  font-weight: 600;
  border: 1px solid transparent;
  cursor: pointer;
  transition: all 0.2s ease;
}

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

.btn-primary:hover {
  background: #5a4126;
  color: #fff;
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

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

.btn-outline:hover {
  background: var(--color-primary);
  color: #fff;
}

.hero-visual {
  display: flex;
  justify-content: center;
  align-items: center;
}

.hero-visual-box {
  width: 100%;
  aspect-ratio: 4 / 3;
  background: linear-gradient(135deg, #d4a862 0%, #7aa777 100%);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}

.hero-visual-box::before {
  content: "";
  position: absolute;
  inset: 0;
  background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='60' height='60' viewBox='0 0 60 60'%3E%3Cg fill='none' stroke='%23ffffff' stroke-opacity='0.08' stroke-width='1'%3E%3Cpath d='M0 30h60M30 0v60'/%3E%3Ccircle cx='30' cy='30' r='14'/%3E%3C/g%3E%3C/svg%3E");
  opacity: 0.5;
}

.hero-visual-inner {
  position: relative;
  z-index: 1;
  text-align: center;
  padding: 24px;
}

.hero-visual-inner .big-icon {
  font-size: 72px;
  margin-bottom: 12px;
}

.hero-visual-inner p {
  font-size: 20px;
  font-weight: 600;
  letter-spacing: 1px;
}

/* ========== Section Utilities ========== */
.section {
  padding: 72px 0;
}

.section-alt {
  background: var(--color-bg-alt);
}

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

.section-header h2 {
  font-size: 30px;
  color: var(--color-primary);
  margin-bottom: 12px;
  font-weight: 700;
}

.section-header p {
  font-size: 16px;
  color: var(--color-text-light);
  max-width: 600px;
  margin: 0 auto;
}

/* ========== Feature Cards (Home) ========== */
.features {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.feature-card {
  background: var(--color-card);
  padding: 32px 28px;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  transition: all 0.25s ease;
}

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: transparent;
}

.feature-icon {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-sm);
  background: rgba(122, 167, 119, 0.12);
  color: var(--color-accent);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 26px;
  margin-bottom: 20px;
}

.feature-card:nth-child(2) .feature-icon {
  background: rgba(212, 168, 98, 0.12);
  color: var(--color-secondary);
}

.feature-card:nth-child(3) .feature-icon {
  background: rgba(107, 78, 46, 0.08);
  color: var(--color-primary);
}

.feature-card h3 {
  font-size: 18px;
  color: var(--color-primary);
  margin-bottom: 10px;
  font-weight: 700;
}

.feature-card p {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.8;
}

/* ========== Works Grid (Home Preview + Works Page) ========== */
.works-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 22px;
}

.works-grid.courses-grid {
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
  max-width: 1100px;
  margin: 0 auto;
}

.work-card {
  background: var(--color-card);
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--color-border);
  transition: all 0.25s ease;
  cursor: pointer;
}

.work-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: transparent;
}

.work-thumb {
  width: 100%;
  aspect-ratio: 4 / 3;
  background: #f0ede8;
  overflow: hidden;
  position: relative;
}

.work-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.35s ease;
}

.work-card:hover .work-thumb img {
  transform: scale(1.05);
}

.work-thumb-placeholder {
  width: 100%;
  aspect-ratio: 4 / 3;
  position: relative;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 10px;
  color: #fff;
  text-align: center;
  padding: 16px;
  background: linear-gradient(135deg, #7aa777 0%, #d4a862 100%);
}

.work-thumb-placeholder.variant-1 { background: linear-gradient(135deg, #6b4e2e 0%, #d4a862 100%); }
.work-thumb-placeholder.variant-2 { background: linear-gradient(135deg, #d4a862 0%, #c56b4c 100%); }
.work-thumb-placeholder.variant-3 { background: linear-gradient(135deg, #7aa777 0%, #5a8cb4 100%); }
.work-thumb-placeholder.variant-4 { background: linear-gradient(135deg, #5a8cb4 0%, #a874c2 100%); }
.work-thumb-placeholder.variant-5 { background: linear-gradient(135deg, #c56b4c 0%, #a874c2 100%); }
.work-thumb-placeholder.variant-6 { background: linear-gradient(135deg, #8a6d4a 0%, #7aa777 100%); }

.work-thumb-placeholder::after {
  content: "";
  position: absolute;
  inset: 0;
  background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='60' height='60' viewBox='0 0 60 60'%3E%3Cg fill='none' stroke='%23ffffff' stroke-opacity='0.08' stroke-width='1'%3E%3Cpath d='M0 30h60M30 0v60'/%3E%3Ccircle cx='30' cy='30' r='14'/%3E%3C/g%3E%3C/svg%3E");
  opacity: 0.5;
  pointer-events: none;
}

.work-play-icon {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.18);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  position: relative;
  z-index: 1;
  padding-left: 4px;
  color: #fff;
  border: 1px solid rgba(255, 255, 255, 0.28);
}

.work-thumb-title {
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.3px;
  position: relative;
  z-index: 1;
  max-width: 92%;
  line-height: 1.3;
  overflow: hidden;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
}


.work-body {
  padding: 16px 18px 20px;
}

.work-tag {
  display: inline-block;
  padding: 2px 10px;
  background: rgba(122, 167, 119, 0.1);
  color: var(--color-accent);
  border-radius: 999px;
  font-size: 12px;
  font-weight: 600;
  margin-bottom: 10px;
}

.work-tag.anim {
  background: rgba(212, 168, 98, 0.12);
  color: var(--color-secondary);
}

.work-title {
  font-size: 15px;
  font-weight: 600;
  color: var(--color-text);
  line-height: 1.4;
}

.section-footer {
  text-align: center;
  margin-top: 40px;
}

/* ========== Filter Tabs (Works Page) ========== */
.filter-tabs {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin-bottom: 40px;
  flex-wrap: wrap;
}

.filter-tab {
  padding: 10px 24px;
  border-radius: 999px;
  border: 1px solid var(--color-border);
  background: #fff;
  color: var(--color-text-light);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s ease;
}

.filter-tab:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.filter-tab.active {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: #fff;
}

/* ========== Page Title (Sub Pages) ========== */
.page-hero {
  padding: 64px 0 48px;
  background: linear-gradient(135deg, #faf8f5 0%, #f5f0e8 100%);
  border-bottom: 1px solid var(--color-border);
}

.breadcrumb {
  font-size: 13px;
  color: var(--color-text-light);
  margin-bottom: 16px;
}

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

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

.breadcrumb span {
  margin: 0 8px;
  color: #bbb;
}

.page-hero h1 {
  font-size: 34px;
  color: var(--color-primary);
  font-weight: 700;
  margin-bottom: 12px;
}

.page-hero p {
  font-size: 16px;
  color: var(--color-text-light);
  max-width: 640px;
}

/* ========== About Layout ========== */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 56px;
  align-items: start;
}

.about-text-block {
  margin-bottom: 36px;
}

.about-text-block:last-child {
  margin-bottom: 0;
}

.about-label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--color-secondary);
  font-weight: 700;
  letter-spacing: 1px;
  margin-bottom: 12px;
  text-transform: uppercase;
}

.about-label::before {
  content: "";
  width: 24px;
  height: 2px;
  background: var(--color-secondary);
}

.about-text-block h3 {
  font-size: 24px;
  color: var(--color-primary);
  margin-bottom: 14px;
  font-weight: 700;
}

.about-text-block p {
  font-size: 15px;
  color: var(--color-text);
  line-height: 1.9;
}

.about-side-card {
  position: sticky;
  top: calc(var(--nav-height) + 32px);
  background: var(--color-bg-alt);
  border-radius: var(--radius-lg);
  padding: 36px 32px;
  border: 1px solid var(--color-border);
}

/* 侧栏备案信息链接：加下划线区分于正文 */
.about-side-card a {
  color: var(--color-primary);
  text-decoration: underline;
}

.contact-list {
  list-style: none;
}

.contact-list li {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 14px 0;
  border-bottom: 1px dashed var(--color-border);
  font-size: 14px;
}

.contact-list li:last-child {
  border-bottom: none;
}

.contact-icon {
  width: 36px;
  height: 36px;
  flex-shrink: 0;
  border-radius: var(--radius-sm);
  background: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary);
  font-size: 18px;
  box-shadow: var(--shadow-sm);
}

.contact-info strong {
  display: block;
  color: var(--color-primary);
  font-weight: 600;
  margin-bottom: 2px;
}

.contact-info span {
  color: var(--color-text-light);
}

/* ========== Stats / Values (Home About Preview) ========== */
.values-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.value-card {
  background: #fff;
  padding: 28px;
  border-radius: var(--radius-md);
  border-left: 3px solid var(--color-secondary);
  box-shadow: var(--shadow-sm);
}

.value-card h4 {
  font-size: 16px;
  color: var(--color-primary);
  margin-bottom: 8px;
  font-weight: 700;
}

.value-card p {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.8;
}

/* ========== Footer ========== */
.site-footer {
  background: var(--color-primary);
  color: rgba(255, 255, 255, 0.85);
  padding: 48px 0 24px;
  margin-top: 48px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 36px;
}

.footer-brand .logo-text {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 18px;
  font-weight: 700;
  color: #fff;
  margin-bottom: 14px;
}

.footer-brand .logo-text img {
  height: 32px;
}

.footer-brand p {
  font-size: 13px;
  line-height: 1.8;
  opacity: 0.75;
  max-width: 280px;
}

.footer-col h5 {
  color: #fff;
  font-size: 14px;
  font-weight: 700;
  margin-bottom: 16px;
  letter-spacing: 0.5px;
}

.footer-col ul {
  list-style: none;
}

.footer-col li {
  margin-bottom: 8px;
}

.footer-col a {
  color: rgba(255, 255, 255, 0.7);
  font-size: 13px;
  transition: color 0.2s;
}

.footer-col a:hover {
  color: #fff;
}

.footer-bottom {
  padding-top: 24px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 12px;
  opacity: 0.6;
}

/* 备案号链接：深色底部上用亮色+下划线，保证可辨识 */
.footer-bottom a {
  color: #9ecbff;
  text-decoration: underline;
}
.footer-bottom a:hover {
  color: #ffffff;
}

/* ========== Responsive ========== */
@media (max-width: 960px) {
  .hero-content {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .features {
    grid-template-columns: repeat(2, 1fr);
  }

  .works-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .works-grid.courses-grid {
    grid-template-columns: repeat(2, 1fr);
    max-width: 760px;
  }

  .about-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .about-side-card {
    position: static;
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }

  .hero h1 {
    font-size: 32px;
  }
}

@media (max-width: 640px) {
  :root {
    --nav-height: 64px;
  }

  .nav {
    flex-wrap: wrap;
    gap: 8px;
    height: auto;
    padding: 10px 0;
  }

  .nav-links {
    width: 100%;
    justify-content: space-between;
    gap: 2px;
    order: 3;
  }

  .nav-links a {
    padding: 6px 10px;
    font-size: 13px;
  }

  .section {
    padding: 48px 0;
  }

  .hero {
    padding: 48px 0 40px;
  }

  .hero h1 {
    font-size: 26px;
  }

  .hero-subtitle {
    font-size: 15px;
  }

  .section-header h2 {
    font-size: 24px;
  }

  .features {
    grid-template-columns: 1fr;
  }

  .works-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 14px;
  }

  .works-grid.courses-grid {
    grid-template-columns: 1fr;
    gap: 20px;
    max-width: 420px;
  }

  .values-grid {
    grid-template-columns: 1fr;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 28px;
  }

  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
  }

  .page-hero {
    padding: 40px 0 32px;
  }

  .page-hero h1 {
    font-size: 26px;
  }
}

/* ========== Lightbox 作品预览弹窗 ========== */
.lightbox {
  position: fixed;
  inset: 0;
  z-index: 1000;
  background: rgba(20, 16, 12, 0.82);
  display: none;
  align-items: center;
  justify-content: center;
  padding: 24px;
  animation: lb-fade 0.2s ease both;
}

.lightbox.open {
  display: flex;
}

@keyframes lb-fade {
  from { opacity: 0; }
  to { opacity: 1; }
}

.lightbox-inner {
  background: #fff;
  border-radius: var(--radius-lg);
  max-width: 720px;
  width: 100%;
  overflow: hidden;
  box-shadow: 0 30px 80px rgba(0, 0, 0, 0.35);
  animation: lb-pop 0.25s ease both;
}

@keyframes lb-pop {
  from { opacity: 0; transform: scale(0.94) translateY(10px); }
  to { opacity: 1; transform: scale(1) translateY(0); }
}

.lightbox-media {
  width: 100%;
  background: #111;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}

.lightbox-media img,
.lightbox-media video {
  width: 100%;
  height: auto;
  max-height: 56vh;
  display: block;
  background: #000;
}

.lightbox-body {
  padding: 24px 28px 28px;
  position: relative;
}

.lightbox-close {
  position: absolute;
  top: 14px;
  right: 14px;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: var(--color-bg-alt);
  border: none;
  color: var(--color-text-light);
  font-size: 18px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.15s ease;
  line-height: 1;
}

.lightbox-close:hover {
  background: var(--color-primary);
  color: #fff;
}

.lightbox-tag {
  display: inline-block;
  padding: 3px 12px;
  background: rgba(122, 167, 119, 0.1);
  color: var(--color-accent);
  border-radius: 999px;
  font-size: 12px;
  font-weight: 600;
  margin-bottom: 10px;
}

.lightbox-tag.anim {
  background: rgba(212, 168, 98, 0.12);
  color: var(--color-secondary);
}

.lightbox-title {
  font-size: 22px;
  color: var(--color-primary);
  font-weight: 700;
  margin-bottom: 8px;
}

.lightbox-meta {
  font-size: 13px;
  color: var(--color-text-light);
  margin-bottom: 14px;
}

.lightbox-desc {
  font-size: 14px;
  color: var(--color-text);
  line-height: 1.8;
  padding-top: 14px;
  border-top: 1px dashed var(--color-border);
}