/* ========================================
   今日大赛 · 竞赛海报视觉系统
   米白 × 橙红 × 金黄 × 绿松石
   ======================================== */

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

body {
  font-family: system-ui, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  overflow-x:hidden;
  background:#FAF6EE;
  color:#1C1917;
  line-height:1.6;
  font-size:16px;
  -webkit-font-smoothing:antialiased;
}

::selection { background:#FF4D00; color:#fff; }

/* ========================================
   核心布局
   ======================================== */
.container { max-width:1200px; margin:0 auto; padding:0 24px; }

.section { padding:84px 0; position:relative; }

.section:nth-child(even) { background:#F0EBDF; }

/* ========================================
   导航
   ======================================== */
.site-header {
  position:fixed;
  top:0;
  left:0;
  width:100%;
  z-index:1000;
  background:rgba(250,246,238,0.92);
  backdrop-filter:blur(16px);
  -webkit-backdrop-filter:blur(16px);
  border-bottom:3px solid #1C1917;
}

.header-inner {
  display:flex;
  align-items:center;
  justify-content:space-between;
  height:72px;
  max-width:1200px;
  margin:0 auto;
  padding:0 24px;
}

.logo {
  display:flex;
  align-items:center;
  gap:10px;
  font-weight:900;
  font-size:1.25rem;
  text-decoration:none;
  color:#1C1917;
  letter-spacing:-0.5px;
}

.logo-icon {
  width:38px;
  height:38px;
  background:#FF4D00;
  color:#fff;
  border-radius:50% 50% 50% 4px;
  display:flex;
  align-items:center;
  justify-content:center;
  font-size:0.9rem;
  font-weight:900;
  transform:rotate(-8deg);
  box-shadow:2px 2px 0 #1C1917;
}

.main-nav {
  display:flex;
  align-items:center;
  gap:28px;
  list-style:none;
}

.main-nav a {
  text-decoration:none;
  font-size:0.9rem;
  font-weight:700;
  color:#1C1917;
  padding:4px 2px;
  border-bottom:3px solid transparent;
  transition:border-color 0.2s, color 0.2s;
}

.main-nav a:hover {
  color:#FF4D00;
  border-bottom-color:#FF4D00;
}

.nav-cta {
  background:#FF4D00;
  color:#fff!important;
  padding:10px 22px;
  font-weight:800;
  border-radius:0;
  border-bottom:none!important;
  box-shadow:3px 3px 0 #1C1917;
  transition:all 0.2s;
}

.nav-cta:hover {
  background:#1C1917;
  color:#FFC400!important;
  transform:translate(-1px,-1px);
  box-shadow:4px 4px 0 #00B2A9;
}

.menu-toggle {
  display:none;
  width:44px;
  height:44px;
  align-items:center;
  justify-content:center;
  background:#FFC400;
  border:2px solid #1C1917;
  border-radius:0;
  cursor:pointer;
  font-size:1.4rem;
  color:#1C1917;
  box-shadow:2px 2px 0 rgba(28,25,23,0.2);
}

/* ========================================
   Hero
   ======================================== */
.hero {
  min-height:90vh;
  display:flex;
  align-items:center;
  padding:140px 0 90px;
  position:relative;
  overflow:hidden;
  background:#FAF6EE;
}

.hero::before {
  content:'111167';
  position:absolute;
  right:-20px;
  bottom:-30px;
  font-size:clamp(8rem, 24vw, 18rem);
  font-weight:900;
  line-height:1;
  color:rgba(28,25,23,0.04);
  letter-spacing:-8px;
  pointer-events:none;
  user-select:none;
}

.hero::after {
  content:'';
  position:absolute;
  top:0;
  right:0;
  width:42%;
  height:100%;
  background:repeating-linear-gradient(
    -45deg,
    transparent 0,
    transparent 14px,
    rgba(255,77,0,0.05) 14px,
    rgba(255,77,0,0.05) 28px
  );
  pointer-events:none;
}

.hero-content {
  max-width:760px;
  position:relative;
  z-index:1;
}

.hero-eyebrow {
  display:inline-block;
  font-size:0.78rem;
  font-weight:800;
  letter-spacing:3px;
  padding:6px 16px;
  background:#FFC400;
  color:#1C1917;
  border:2px solid #1C1917;
  box-shadow:3px 3px 0 #FF4D00;
  margin-bottom:20px;
  transform:rotate(-2deg);
}

.hero h1 {
  font-size:clamp(2.6rem, 5vw, 4rem);
  font-weight:900;
  line-height:1.05;
  letter-spacing:-3px;
  margin-bottom:20px;
  border-left:8px solid #FF4D00;
  padding-left:28px;
}

.hero p {
  font-size:1.1rem;
  color:#1C1917;
  opacity:0.7;
  max-width:560px;
  margin-bottom:34px;
  padding-left:36px;
  line-height:1.7;
}

.hero-buttons {
  display:flex;
  gap:16px;
  padding-left:36px;
}

.hero-image {
  border-radius:0;
  overflow:hidden;
  border:3px solid #1C1917;
  box-shadow:10px 10px 0 #FFC400;
  transform:rotate(2deg);
  background:#fff;
}

.hero-image img {
  width:100%;
  height:auto;
  display:block;
}

/* ========================================
   按钮
   ======================================== */
.btn {
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:14px 30px;
  border-radius:0;
  font-weight:800;
  font-size:0.95rem;
  cursor:pointer;
  border:2px solid #1C1917;
  text-decoration:none;
  transition:all 0.2s;
}

.btn-primary {
  background:#FF4D00;
  color:#fff;
  box-shadow:4px 4px 0 #1C1917;
}

.btn-primary:hover {
  transform:translate(-2px,-2px);
  box-shadow:6px 6px 0 #1C1917;
  background:#E84300;
}

.btn-primary:active {
  transform:translate(2px,2px);
  box-shadow:1px 1px 0 #1C1917;
}

.btn-outline {
  background:transparent;
  border:2px solid #1C1917;
  color:#1C1917;
  box-shadow:4px 4px 0 rgba(28,25,23,0.15);
}

.btn-outline:hover {
  background:#1C1917;
  color:#FFC400;
  transform:translate(-2px,-2px);
  box-shadow:6px 6px 0 #FF4D00;
}

/* ========================================
   标签 / 标题
   ======================================== */
.section-label {
  display:inline-block;
  font-size:0.75rem;
  font-weight:800;
  letter-spacing:4px;
  background:#FF4D00;
  color:#fff;
  padding:5px 14px;
  margin-bottom:16px;
  text-transform:uppercase;
}

.section-title {
  font-size:clamp(2rem, 3.5vw, 2.8rem);
  font-weight:900;
  letter-spacing:-2px;
  line-height:1.15;
  margin-bottom:16px;
}

.section-title::after {
  content:'';
  display:block;
  width:60px;
  height:4px;
  background:#FF4D00;
  margin-top:14px;
}

.section-desc {
  max-width:600px;
  opacity:0.7;
  margin-bottom:44px;
  font-size:1.05rem;
  line-height:1.7;
}

/* ========================================
   卡片网格
   ======================================== */
.cards-grid {
  display:grid;
  grid-template-columns:repeat(auto-fill,minmax(260px,1fr));
  gap:24px;
}

.category-card {
  border-radius:0;
  padding:28px;
  border:2px solid #1C1917;
  background:#fff;
  box-shadow:5px 5px 0 rgba(28,25,23,0.12);
  transition:all 0.25s;
  position:relative;
}

.category-card:hover {
  transform:translate(-3px,-3px) rotate(-1deg);
  box-shadow:8px 8px 0 #FF4D00;
}

.card-icon {
  width:50px;
  height:50px;
  border-radius:50% 50% 50% 4px;
  display:flex;
  align-items:center;
  justify-content:center;
  margin-bottom:18px;
  font-size:1.3rem;
  background:#FFC400;
  border:2px solid #1C1917;
  box-shadow:2px 2px 0 #1C1917;
}

.card-link {
  font-weight:800;
  font-size:0.85rem;
  text-decoration:none;
  color:#FF4D00;
  display:inline-block;
  margin-top:10px;
  transition:color 0.2s;
}

.card-link::after {
  content:'→';
  margin-left:4px;
  transition:margin-left 0.2s;
}

.card-link:hover::after {
  margin-left:10px;
}

/* ========================================
   特性块
   ======================================== */
.feature-block {
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:64px;
  align-items:center;
}

.feature-image {
  border-radius:0;
  overflow:hidden;
  border:3px solid #1C1917;
  box-shadow:8px 8px 0 #00B2A9;
}

.feature-image img {
  width:100%;
  height:auto;
  display:block;
}

.feature-text { }

.feature-list {
  list-style:none;
  margin-top:8px;
}

.feature-list li {
  padding:9px 0;
  display:flex;
  align-items:center;
  gap:10px;
  font-weight:500;
  border-bottom:1px dashed rgba(28,25,23,0.15);
}

.feature-list li::before {
  content:'●';
  font-weight:900;
  color:#FF4D00;
  font-size:0.7rem;
}

/* ========================================
   数据条
   ======================================== */
.stats-bar {
  display:grid;
  grid-template-columns:repeat(4,1fr);
  gap:24px;
  text-align:center;
}

.stat-item {
  padding:32px 20px;
  border-radius:0;
  border:2px solid #1C1917;
  background:#fff;
  box-shadow:5px 5px 0 rgba(28,25,23,0.1);
  transition:all 0.2s;
  position:relative;
}

.stat-item:hover {
  transform:translateY(-4px);
  box-shadow:5px 10px 0 rgba(28,25,23,0.15);
}

.stat-item::before {
  content:'★';
  position:absolute;
  top:8px;
  right:12px;
  color:#FFC400;
  font-size:1.2rem;
}

.stat-number {
  font-size:2.8rem;
  font-weight:900;
  letter-spacing:-3px;
  color:#FF4D00;
  line-height:1;
  display:block;
}

.stat-label {
  font-size:0.85rem;
  opacity:0.6;
  margin-top:10px;
  font-weight:700;
}

/* ========================================
   内容墙
   ======================================== */
.content-wall {
  display:grid;
  grid-template-columns:repeat(auto-fill,minmax(280px,1fr));
  gap:24px;
}

.content-wall-item {
  border-radius:0;
  overflow:hidden;
  border:2px solid #1C1917;
  background:#fff;
  box-shadow:4px 4px 0 rgba(28,25,23,0.1);
  transition:all 0.25s;
}

.content-wall-item:hover {
  transform:translateY(-4px);
  box-shadow:8px 8px 0 #FFC400;
}

.content-wall-item img {
  width:100%;
  height:200px;
  object-fit:cover;
  border-bottom:2px solid #1C1917;
  transition:transform 0.4s;
}

.content-wall-item:hover img {
  transform:scale(1.03);
}

.content-wall-body {
  padding:20px;
  font-weight:500;
  font-size:0.95rem;
}

/* ========================================
   FAQ
   ======================================== */
.faq-list {
  max-width:800px;
  margin:0 auto;
}

.faq-item {
  border:2px solid #1C1917;
  border-radius:0;
  margin-bottom:12px;
  overflow:hidden;
  cursor:pointer;
  background:#fff;
  transition:box-shadow 0.25s, transform 0.25s;
}

.faq-item:hover {
  box-shadow:4px 4px 0 rgba(255,77,0,0.3);
}

.faq-item.open {
  box-shadow:4px 4px 0 #FFC400;
  transform:translate(-2px,-2px);
}

.faq-item .faq-question {
  padding:18px 22px;
  font-weight:800;
  display:flex;
  justify-content:space-between;
  align-items:center;
  gap:12px;
  letter-spacing:-0.2px;
}

.faq-item .faq-question::after {
  content:'＋';
  font-weight:900;
  color:#FF4D00;
  font-size:1.2rem;
}

.faq-item.open .faq-question::after {
  content:'－';
  color:#00B2A9;
}

.faq-item .faq-answer {
  padding:0 22px 18px;
  display:none;
  opacity:0.7;
  line-height:1.7;
}

.faq-item.open .faq-answer {
  display:block;
  animation:faqFade 0.3s ease;
}

@keyframes faqFade {
  from { opacity:0; transform:translateY(-6px); }
  to   { opacity:0.7; transform:translateY(0); }
}

/* ========================================
   CTA 横幅
   ======================================== */
.cta-banner {
  padding:64px 48px;
  text-align:center;
  border-radius:0;
  color:#fff;
  background:#FF4D00;
  border:3px solid #1C1917;
  box-shadow:10px 10px 0 #FFC400;
  position:relative;
  overflow:hidden;
}

.cta-banner::before {
  content:'';
  position:absolute;
  top:0;
  left:0;
  width:100%;
  height:100%;
  background:repeating-linear-gradient(
    -45deg,
    transparent 0,
    transparent 20px,
    rgba(255,255,255,0.06) 20px,
    rgba(255,255,255,0.06) 40px
  );
  pointer-events:none;
}

.cta-banner h2 {
  color:#fff;
  font-size:clamp(1.8rem, 3vw, 2.5rem);
  font-weight:900;
  letter-spacing:-1px;
  position:relative;
  z-index:1;
}

.cta-banner .btn-primary {
  background:#fff;
  color:#FF4D00;
  border-color:#1C1917;
  box-shadow:4px 4px 0 #1C1917;
  position:relative;
  z-index:1;
  margin-top:8px;
}

.cta-banner .btn-primary:hover {
  background:#FFC400;
  color:#1C1917;
}

/* ========================================
   页脚
   ======================================== */
.site-footer {
  padding:60px 0 30px;
  background:#EFE8DB;
  border-top:3px solid #1C1917;
}

.site-footer .container { }

.footer-grid {
  display:grid;
  grid-template-columns:2fr 1fr 1fr 1fr;
  gap:40px;
}

.footer-brand {
  font-weight:900;
  font-size:1.2rem;
  letter-spacing:-0.5px;
  color:#1C1917;
}

.footer-col {
  font-size:0.9rem;
}

.footer-col h4 {
  font-size:0.78rem;
  font-weight:800;
  letter-spacing:2px;
  margin-bottom:14px;
  text-transform:uppercase;
  color:#FF4D00;
}

.footer-col a {
  display:block;
  color:#1C1917;
  text-decoration:none;
  padding:4px 0;
  opacity:0.75;
  font-weight:500;
  transition:all 0.2s;
}

.footer-col a:hover {
  opacity:1;
  color:#FF4D00;
  padding-left:4px;
}

.footer-bottom {
  border-top:2px solid rgba(28,25,23,0.1);
  margin-top:44px;
  padding-top:20px;
  text-align:center;
  font-size:0.85rem;
  opacity:0.6;
  font-weight:500;
}

/* ========================================
   工具类
   ======================================== */
.text-accent {
  color:#FF4D00;
  font-weight:800;
}

.text-center { text-align:center; }

.seo-description {
  max-width:600px;
  margin:0 auto 48px;
  opacity:0.7;
  line-height:1.7;
}

.mt-0 { margin-top:0; }
.mb-0 { margin-bottom:0; }

/* ========================================
   响应式
   ======================================== */
@media (max-width: 768px) {
  .feature-block {
    grid-template-columns:1fr;
    gap:32px;
  }

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

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

  .main-nav {
    display:none;
  }

  .menu-toggle {
    display:flex;
  }

  .main-nav.open {
    display:flex;
    flex-direction:column;
    position:absolute;
    top:72px;
    left:0;
    width:100%;
    background:#FAF6EE;
    padding:20px 24px;
    border-bottom:3px solid #1C1917;
    gap:16px;
  }

  .main-nav.open a {
    font-size:1rem;
    padding:8px 0;
  }

  .main-nav.open .nav-cta {
    display:inline-block;
    text-align:center;
    margin-top:4px;
  }

  .hero {
    padding:120px 0 60px;
    min-height:auto;
  }

  .hero h1 {
    font-size:2.4rem;
    letter-spacing:-2px;
  }

  .hero-image {
    margin-top:40px;
  }

  .cta-banner {
    padding:44px 28px;
    box-shadow:6px 6px 0 #FFC400;
  }
}

@media (max-width: 480px) {
  .cards-grid,
  .content-wall,
  .stats-bar {
    grid-template-columns:1fr;
  }

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

  .hero-buttons {
    flex-direction:column;
    align-items:stretch;
    padding-left:0;
  }

  .hero h1 {
    font-size:2rem;
    padding-left:16px;
    border-left-width:6px;
  }

  .hero p {
    padding-left:16px;
  }

  .hero::before {
    font-size:6rem;
    bottom:-10px;
  }

  .section {
    padding:64px 0;
  }

  .section-title {
    font-size:1.7rem;
  }

  .cta-banner {
    padding:36px 20px;
  }

  .cta-banner h2 {
    font-size:1.5rem;
  }

  .btn {
    justify-content:center;
  }

  .stat-number {
    font-size:2.2rem;
  }
}