/* DNW Packaging 2.0 — Design System
   Brand: light background, natural fiber texture, Hunter Green accents */
:root {
  --green-900: #143D2A;
  --green-700: #1F5C3D;
  --green-600: #2E7D4F;
  --green-100: #E4EFE7;
  --green-050: #F2F7F3;
  --paper: #FAF9F5;
  --fiber: #F3F1EA;
  --ink: #1C2320;
  --ink-soft: #4A5450;
  --line: #E2E0D8;
  --amber: #B98A2F;
  --white: #FFFFFF;
  --radius: 14px;
  --maxw: 1160px;
  --font: "Helvetica Neue", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font);
  color: var(--ink);
  background: var(--paper);
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}
/* subtle fiber texture */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background-image:
    repeating-linear-gradient(90deg, rgba(31,92,61,0.018) 0 2px, transparent 2px 7px),
    repeating-linear-gradient(0deg, rgba(31,92,61,0.014) 0 1px, transparent 1px 9px);
}
main, header, footer { position: relative; z-index: 1; }

.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }
h1, h2, h3 { font-weight: 500; line-height: 1.25; }
h1 { font-size: clamp(30px, 4.4vw, 50px); letter-spacing: -0.5px; }
h2 { font-size: clamp(24px, 3vw, 34px); letter-spacing: -0.3px; }
h3 { font-size: 18px; }
p.lead { font-size: 18px; color: var(--ink-soft); }
a { color: var(--green-700); text-decoration: none; }
a:hover { color: var(--green-600); }

/* ===== Header ===== */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(250,249,245,0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
.site-header .wrap {
  display: flex; align-items: center; justify-content: space-between;
  height: 64px; gap: 24px;
}
.logo { display: flex; align-items: center; gap: 10px; }
.logo-mark {
  width: 34px; height: 34px; border-radius: 8px;
  background: var(--green-700);
  display: grid; place-items: center;
}
.logo-mark svg { width: 20px; height: 20px; }
.logo-text { font-weight: 500; font-size: 17px; color: var(--ink); }
.logo-text small { display: block; font-size: 10.5px; color: var(--ink-soft); font-weight: 400; letter-spacing: 1px; }
.main-nav { display: flex; gap: 4px; align-items: center; }
.main-nav a {
  padding: 8px 12px; border-radius: 8px;
  font-size: 14.5px; color: var(--ink-soft);
}
.main-nav a:hover, .main-nav a.active { background: var(--green-100); color: var(--green-900); }
.header-actions { display: flex; align-items: center; gap: 10px; }
.lang-switch {
  display: flex; border: 1px solid var(--line); border-radius: 9px; overflow: hidden;
}
.lang-switch a { padding: 6px 12px; font-size: 13px; color: var(--ink-soft); }
.lang-switch a.active { background: var(--green-700); color: #fff; }
.nav-toggle { display: none; background: none; border: 1px solid var(--line); border-radius: 8px; padding: 8px 10px; cursor: pointer; }
.nav-toggle span { display: block; width: 18px; height: 2px; background: var(--ink); margin: 4px 0; }

/* ===== Buttons ===== */
.btn {
  display: inline-block; padding: 13px 26px; border-radius: 10px;
  font-size: 15.5px; font-weight: 500; transition: 0.15s;
  border: 1px solid transparent; cursor: pointer;
}
.btn-primary { background: var(--green-700); color: #fff; }
.btn-primary:hover { background: var(--green-600); color: #fff; }
.btn-outline { border-color: var(--green-700); color: var(--green-700); background: transparent; }
.btn-outline:hover { background: var(--green-050); }
.btn-sm { padding: 9px 18px; font-size: 14px; }

/* ===== Hero ===== */
.hero { padding: 72px 0 64px; background: var(--fiber); border-bottom: 1px solid var(--line); }
.hero-grid { display: grid; grid-template-columns: 1.05fr 0.95fr; gap: 48px; align-items: center; }
.kicker {
  display: inline-block; font-size: 13px; letter-spacing: 2px; text-transform: uppercase;
  color: var(--green-600); margin-bottom: 16px; font-weight: 500;
}
.hero .sub { font-size: 19px; color: var(--green-700); margin: 14px 0 8px; font-weight: 500; }
.hero .desc { font-size: 17px; color: var(--ink-soft); margin-bottom: 28px; max-width: 480px; }
.hero-ctas { display: flex; gap: 14px; flex-wrap: wrap; }
.hero-visual {
  border-radius: 18px; overflow: hidden; border: 1px solid var(--line);
  background: var(--white); min-height: 320px;
}
.hero-visual img, .img-ph { display: block; width: 100%; height: 100%; object-fit: cover; }

/* ===== Sections ===== */
.section { padding: 72px 0; border-bottom: 1px solid var(--line); }
.section.tint { background: var(--green-050); }
.section-head { max-width: 720px; margin-bottom: 40px; }
.section-head p { color: var(--ink-soft); margin-top: 10px; }

.grid { display: grid; gap: 20px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

.card {
  background: var(--white); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 24px; transition: 0.15s;
}
.card:hover { border-color: var(--green-600); transform: translateY(-2px); }
.card h3 { color: var(--green-900); margin-bottom: 8px; }
.card p { font-size: 14.5px; color: var(--ink-soft); }
.card .card-link { display: inline-block; margin-top: 12px; font-size: 14px; font-weight: 500; }
.icon-chip {
  width: 42px; height: 42px; border-radius: 10px; background: var(--green-100);
  display: grid; place-items: center; margin-bottom: 14px;
}
.icon-chip svg { width: 22px; height: 22px; stroke: var(--green-700); fill: none; stroke-width: 1.6; }

/* Process stepper */
.process { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; }
.process .step {
  background: var(--white); border: 1px solid var(--line); border-radius: 999px;
  padding: 8px 18px; font-size: 14px; color: var(--ink);
}
.process .arrow { color: var(--green-600); font-size: 16px; }

/* Performance tags */
.tag-row { display: flex; flex-wrap: wrap; gap: 8px; }
.tag {
  background: var(--white); border: 1px solid var(--line); border-radius: 999px;
  padding: 7px 16px; font-size: 13.5px; color: var(--ink-soft);
}
.tag b { color: var(--green-700); font-weight: 500; }

/* ===== Film selector tool ===== */
.tool {
  background: var(--white); border: 1px solid var(--line); border-radius: 16px;
  padding: 32px; display: grid; grid-template-columns: 1fr 1fr; gap: 32px;
}
.tool-field { margin-bottom: 18px; }
.tool-field label { display: block; font-size: 14px; font-weight: 500; margin-bottom: 8px; color: var(--ink); }
.tool-field select, .tool-field input[type="text"] {
  width: 100%; padding: 11px 14px; border: 1px solid var(--line); border-radius: 9px;
  font-size: 15px; font-family: var(--font); background: var(--paper); color: var(--ink);
}
.checks { display: flex; flex-wrap: wrap; gap: 8px; }
.checks label {
  display: flex; align-items: center; gap: 7px; font-size: 14px; font-weight: 400;
  border: 1px solid var(--line); border-radius: 999px; padding: 7px 14px; cursor: pointer;
  background: var(--paper);
}
.checks input { accent-color: var(--green-700); }
.tool-result {
  background: var(--green-050); border: 1px solid var(--green-100); border-radius: 12px;
  padding: 24px; min-height: 200px;
}
.tool-result .film-name { font-size: 26px; color: var(--green-900); font-weight: 500; margin: 6px 0 10px; }
.tool-result p { font-size: 14.5px; color: var(--ink-soft); }
.tool-result .why { margin-top: 12px; font-size: 13.5px; }
.tool-result .why li { margin-left: 18px; }

/* ===== FAQ ===== */
.faq-item { border-bottom: 1px solid var(--line); padding: 18px 0; }
.faq-item summary { cursor: pointer; font-weight: 500; font-size: 16px; color: var(--ink); list-style: none; display: flex; justify-content: space-between; align-items: center; }
.faq-item summary::after { content: "+"; color: var(--green-600); font-size: 20px; }
.faq-item[open] summary::after { content: "–"; }
.faq-item p { margin-top: 10px; color: var(--ink-soft); font-size: 14.5px; }

/* ===== Evidence / numbers ===== */
.evidence-row { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.evidence-num { font-size: 15px; font-weight: 500; color: var(--green-700); display: block; margin-bottom: 6px; }

/* ===== CTA band ===== */
.cta-band { background: var(--green-700); color: #fff; padding: 64px 0; }
.cta-band h2 { color: #fff; }
.cta-band p { color: #D8E6DC; margin: 12px 0 28px; max-width: 560px; }
.cta-band .btn-primary { background: #fff; color: var(--green-900); }
.cta-band .btn-outline { border-color: rgba(255,255,255,0.6); color: #fff; }

/* ===== Footer ===== */
.site-footer { background: var(--fiber); padding: 48px 0 32px; border-top: 1px solid var(--line); }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 32px; }
.footer-grid h4 { font-size: 14px; font-weight: 500; margin-bottom: 12px; color: var(--ink); }
.footer-grid a { display: block; font-size: 13.5px; color: var(--ink-soft); padding: 3px 0; }
.footer-bottom { margin-top: 32px; padding-top: 20px; border-top: 1px solid var(--line); font-size: 12.5px; color: var(--ink-soft); display: flex; justify-content: space-between; flex-wrap: wrap; gap: 8px; }

/* ===== Contact form ===== */
.contact-grid { display: grid; grid-template-columns: 1fr 1.2fr; gap: 48px; }
.form-card { background: var(--white); border: 1px solid var(--line); border-radius: 16px; padding: 32px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.form-field { margin-bottom: 16px; }
.form-field label { display: block; font-size: 14px; font-weight: 500; margin-bottom: 6px; }
.form-field input, .form-field select, .form-field textarea {
  width: 100%; padding: 11px 14px; border: 1px solid var(--line); border-radius: 9px;
  font-size: 15px; font-family: var(--font); background: var(--paper);
}
.form-field textarea { min-height: 110px; resize: vertical; }
.form-status { margin-top: 12px; font-size: 14px; color: var(--green-700); display: none; }
.form-note { font-size: 12.5px; color: var(--ink-soft); margin-top: 8px; }

/* ===== Detail page ===== */
.detail-hero { background: var(--fiber); padding: 56px 0 40px; border-bottom: 1px solid var(--line); }
.breadcrumb { font-size: 13.5px; color: var(--ink-soft); margin-bottom: 14px; }
.spec-table { width: 100%; border-collapse: collapse; font-size: 14.5px; }
.spec-table th, .spec-table td { text-align: left; padding: 10px 14px; border-bottom: 1px solid var(--line); }
.spec-table th { color: var(--green-900); font-weight: 500; background: var(--green-050); width: 38%; }

/* ===== Responsive ===== */
@media (max-width: 960px) {
  .hero-grid, .tool, .contact-grid, .grid-4, .grid-3 { grid-template-columns: 1fr; }
  .grid-2 { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .evidence-row { grid-template-columns: 1fr; }
  .main-nav {
    display: none; position: absolute; top: 64px; left: 0; right: 0;
    background: var(--paper); border-bottom: 1px solid var(--line);
    flex-direction: column; align-items: stretch; padding: 12px 20px;
  }
  .main-nav.open { display: flex; }
  .nav-toggle { display: block; }
  .form-row { grid-template-columns: 1fr; }
}