```css
/* ============================================
   影视工厂 · FILM FACTORY DESIGN SYSTEM
   灵感入厂，光影出厂 —— 暖调电影工业美学
   ============================================ */

:root {
  --cream: #F4EBD9;          /* 片场米白 */
  --paper: #FBF6EB;          /* 灯箱纸白 */
  --ink: #28231C;            /* 暖墨 */
  --oxide: #C84523;          /* 铁锈红 / 电影胶片红 */
  --petrol: #125E60;         /* 投影仪深青 */
  --amber: #E5A53C;          /* 光束金 */
  --line: #D8CBBA;           /* 分格线 */
  --mono: ui-monospace, 'Cascadia Code', 'JetBrains Mono', 'Courier New', monospace;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: system-ui, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  background-color: var(--cream);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='120' height='120'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.8' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='120' height='120' filter='url(%23n)' opacity='0.04'/%3E%3C/svg%3E");
  color: var(--ink);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

/* 顶部胶片引导带（电影片头） */
body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 5px;
  z-index: 3000;
  pointer-events: none;
  background: repeating-linear-gradient(90deg,
    var(--oxide) 0 24px,
    var(--amber) 24px 36px,
    var(--petrol) 36px 60px);
  opacity: 0.85;
}

::selection { background: var(--amber); color: var(--ink); }

::-webkit-scrollbar { width: 10px; }
::-webkit-scrollbar-track { background: var(--cream); }
::-webkit-scrollbar-thumb {
  background: var(--petrol);
  border: 2px solid var(--cream);
  border-radius: 5px;
}

a:focus-visible,
button:focus-visible {
  outline: 3px solid var(--oxide);
  outline-offset: 2px;
}

img { max-width: 100%; }

/* ============ 基础布局 ============ */

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: 90px 0;
  position: relative;
}

.section:nth-child(even) {
  background-color: #EDE1CB;
  background-image:
    linear-gradient(rgba(40,35,28,0.02) 1px, transparent 1px),
    linear-gradient(90deg, rgba(40,35,28,0.02) 1px, transparent 1px);
  background-size: 32px 32px;
  border-top: 1px dashed #C9B99F;
  border-bottom: 1px dashed #C9B99F;
}

/* ============ 导航 ============ */

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background: rgba(244, 235, 217, 0.92);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 2px solid var(--ink);
  box-shadow: 0 2px 0 0 var(--amber);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 70px;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 800;
  font-size: 1.25rem;
  letter-spacing: -0.02em;
  text-decoration: none;
  color: var(--ink);
  white-space: nowrap;
}

.logo-icon {
  position: relative;
  width: 40px;
  height: 40px;
  flex-shrink: 0;
  background: var(--paper);
  border: 2.5px solid var(--ink);
  border-radius: 3px;
  box-shadow: 3px 3px 0 var(--oxide);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.6rem;
  font-weight: 800;
  color: var(--oxide);
  letter-spacing: 0.5px;
}

.logo-icon::before,
.logo-icon::after {
  content: '';
  position: absolute;
  left: 5px;
  width: 26px;
  height: 2px;
  background: repeating-linear-gradient(90deg, var(--ink) 0 2px, transparent 2px 6px);
  opacity: 0.4;
}

.logo-icon::before { top: 6px; }
.logo-icon::after { bottom: 6px; }

.main-nav {
  display: flex;
  align-items: center;
  gap: 4px;
  list-style: none;
}

.main-nav a {
  position: relative;
  text-decoration: none;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--ink);
  padding: 8px 14px;
  letter-spacing: 0.02em;
  transition: color 0.2s;
}

.main-nav a::after {
  content: '';
  position: absolute;
  left: 8px;
  right: 8px;
  bottom: 2px;
  height: 3px;
  background: var(--amber);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform 0.3s cubic-bezier(0.22, 1, 0.36, 1);
}

.main-nav a:hover { color: var(--oxide); }
.main-nav a:hover::after {
  transform: scaleX(1);
  transform-origin: left;
}

.nav-cta {
  background: var(--oxide) !important;
  color: var(--paper) !important;
  border: 2px solid var(--ink) !important;
  border-radius: 0 !important;
  box-shadow: 2px 2px 0 var(--ink) !important;
  padding: 9px 18px !important;
  font-weight: 700 !important;
  margin-left: 8px;
  transition: transform 0.15s, box-shadow 0.15s !important;
}

.nav-cta:hover {
  transform: translate(1px, 1px) !important;
  box-shadow: 1px 1px 0 var(--ink) !important;
  color: var(--paper) !important;
}

.menu-toggle {
  display: none;
  width: 44px;
  height: 44px;
  align-items: center;
  justify-content: center;
  background: var(--paper);
  border: 2px solid var(--ink);
  box-shadow: 2px 2px 0 var(--ink);
  cursor: pointer;
}

.menu-toggle::before {
  content: '≡';
  font-size: 1.8rem;
  font-weight: 700;
  line-height: 1;
}

/* ============ 首页 Hero ============ */

.hero {
  min-height: 80vh;
  display: flex;
  align-items: center;
  padding: 150px 0 90px;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -10%;
  left: 20%;
  width: 120%;
  height: 120%;
  background: linear-gradient(115deg,
    transparent 0%,
    rgba(229, 165, 60, 0.14) 20%,
    rgba(229, 165, 60, 0.02) 40%,
    transparent 55%);
  transform: rotate(-8deg);
  pointer-events: none;
}

.hero::after {
  content: '光影';
  position: absolute;
  right: -10px;
  bottom: -30px;
  font-size: clamp(6rem, 14vw, 13rem);
  font-weight: 800;
  line-height: 1;
  letter-spacing: -0.05em;
  color: transparent;
  -webkit-text-stroke: 1.5px rgba(40, 35, 28, 0.06);
  pointer-events: none;
  z-index: 0;
}

.hero .container {
  position: relative;
  z-index: 2;
  display: flex;
  align-items: center;
  gap: 60px;
  width: 100%;
}

.hero-content {
  flex: 1 1 55%;
  max-width: 640px;
  position: relative;
}

.hero-eyebrow {
  display: inline-block;
  background: var(--petrol);
  color: var(--paper);
  font-family: var(--mono);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 2px;
  text-transform: uppercase;
  padding: 6px 18px 6px 14px;
  clip-path: polygon(10px 0, 100% 0, calc(100% - 10px) 100%, 0 100%);
  margin-bottom: 18px;
}

.hero h1 {
  font-size: clamp(2.8rem, 5vw, 4.2rem);
  font-weight: 800;
  line-height: 1.05;
  letter-spacing: -0.01em;
  margin-bottom: 24px;
  text-wrap: balance;
}

.hero h1::after {
  content: '';
  display: block;
  width: 140px;
  height: 6px;
  margin-top: 22px;
  background: repeating-linear-gradient(-45deg, var(--oxide) 0 8px, var(--amber) 8px 16px);
}

.hero p {
  font-size: 1.08rem;
  line-height: 1.8;
  opacity: 0.8;
  max-width: 560px;
  margin-bottom: 34px;
  padding-left: 16px;
  border-left: 3px solid var(--amber);
}

.hero-buttons {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  position: relative;
  z-index: 3;
}

.hero-image {
  position: relative;
  flex: 1 1 45%;
  background: var(--paper);
  border: 2px solid var(--ink);
  box-shadow: 12px 12px 0 var(--petrol);
  padding: 16px 16px 22px;
  transform: rotate(1deg);
  z-index: 2;
}

.hero-image::before,
.hero-image::after {
  content: '';
  position: absolute;
  left: -2px;
  width: calc(100% + 4px);
  height: 14px;
  background-image: radial-gradient(circle at 16px 7px, var(--ink) 3px, transparent 3.5px);
  background-size: 32px 14px;
  background-position: center;
  background-repeat: repeat-x;
  z-index: 2;
}

.hero-image::before { top: -2px; }
.hero-image::after { bottom: -2px; }

.hero-image img {
  display: block;
  width: 100%;
  height: auto;
  border: 2px solid var(--ink);
  background: var(--ink);
}

/* ============ 按钮 ============ */

.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 30px;
  font-weight: 700;
  font-size: 0.92rem;
  letter-spacing: 0.02em;
  cursor: pointer;
  border: 2px solid var(--ink);
  border-radius: 0;
  text-decoration: none;
  background: var(--paper);
  color: var(--ink);
  box-shadow: 4px 4px 0 var(--ink);
  transition: transform 0.18s cubic-bezier(0.22, 1, 0.36, 1), box-shadow 0.18s;
}

.btn:hover {
  transform: translate(2px, 2px);
  box-shadow: 2px 2px 0 var(--ink);
}

.btn:active {
  transform: translate(4px, 4px);
  box-shadow: 0 0 0 var(--ink);
}

.btn-primary {
  background: var(--oxide);
  color: var(--paper);
  border-color: var(--ink);
}

.btn-outline {
  background: transparent;
  color: var(--ink);
  border: 2px solid var(--ink);
  box-shadow: 4px 4px 0 var(--ink);
}

.btn-outline:hover { background: var(--paper); }

/* ============ 标签 / 标题 ============ */

.section-label {
  display: inline-block;
  background: var(--petrol);
  color: var(--paper);
  font-family: var(--mono);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 3px;
  text-transform: uppercase;
  padding: 6px 20px 6px 16px;
  clip-path: polygon(8px 0, 100% 0, calc(100% - 8px) 100%, 0 100%);
  margin-bottom: 16px;
}

.section-title {
  display: inline-block;
  font-size: clamp(1.9rem, 3.2vw, 2.6rem);
  font-weight: 800;
  letter-spacing: -0.01em;
  line-height: 1.15;
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 2.5px solid var(--ink);
  background-image: linear-gradient(90deg, var(--oxide) 0 50%, transparent 50%);
  background-size: 140px 2.5px;
  background-position: 0 100%;
  background-repeat: no-repeat;
}

.section-desc {
  max-width: 640px;
  font-size: 1rem;
  line-height: 1.8;
  opacity: 0.75;
  margin-bottom: 44px;
}

/* ============ 卡片网格 ============ */

.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 28px;
}

.category-card {
  background: var(--paper);
  border: 2px solid var(--ink);
  border-top: 6px solid var(--amber);
  border-radius: 0;
  padding: 30px 26px;
  box-shadow: 5px 5px 0 var(--ink);
  position: relative;
  transition: transform 0.2s cubic-bezier(0.22, 1, 0.36, 1), box-shadow 0.2s, border-top-color 0.2s;
}

.category-card:nth-child(4n+2) { border-top-color: var(--oxide); }
.category-card:nth-child(4n+3) { border-top-color: var(--petrol); }
.category-card:nth-child(4n+4) { border-top-color: var(--ink); }

.category-card:hover {
  transform: translate(-2px, -2px);
  box-shadow: 8px 8px 0 var(--oxide);
  border-top-color: var(--oxide);
}

.category-card:nth-child(4n+2):hover { border-top-color: var(--