:root {
  --bg: #0e0f1a;
  --bg-soft: #161829;
  --panel: #1b1d31;
  --panel-2: #21243c;
  --line: #2c2f4a;
  --ink: #eef0fb;
  --ink-soft: #b6bad6;
  --ink-dim: #818699;
  --brand: #ff5a7e;
  --brand-2: #7c6cff;
  --accent: #2ee6c8;
  --warn: #ffb454;
  --radius: 14px;
  --shadow: 0 18px 50px rgba(0, 0, 0, 0.45);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: radial-gradient(1200px 600px at 80% -10%, #2a1c3a 0%, transparent 55%),
    radial-gradient(1000px 500px at -10% 0%, #15243a 0%, transparent 50%), var(--bg);
  color: var(--ink);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.wrap { width: min(1120px, 92vw); margin: 0 auto; }

a { color: inherit; text-decoration: none; }

/* ---------- topbar ---------- */
.topbar {
  position: sticky; top: 0; z-index: 20;
  background: rgba(14, 15, 26, 0.82);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.topbar-inner { display: flex; align-items: center; justify-content: space-between; height: 60px; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; }
.logo {
  display: grid; place-items: center; width: 30px; height: 30px;
  border-radius: 9px; background: linear-gradient(135deg, var(--brand), var(--brand-2));
  color: #fff; font-size: 15px;
}
.brand-name { font-size: 16px; letter-spacing: 0.3px; }
.topnav { display: flex; gap: 22px; font-size: 14px; color: var(--ink-soft); }
.topnav a:hover { color: var(--ink); }

/* ---------- hero ---------- */
.hero { padding: 64px 0 40px; }
.eyebrow {
  display: inline-block; margin: 0 0 14px; padding: 5px 13px;
  font-size: 12.5px; letter-spacing: 1px; color: var(--accent);
  border: 1px solid rgba(46, 230, 200, 0.35); border-radius: 999px;
  background: rgba(46, 230, 200, 0.07);
}
.hero h1 { margin: 0 0 18px; font-size: clamp(28px, 5vw, 46px); line-height: 1.18; letter-spacing: 0.5px; }
.hero .sub { max-width: 680px; font-size: 17px; color: var(--ink-soft); margin: 0 0 26px; }
.hero .sub b { color: var(--ink); }
.hero-cta { display: flex; flex-wrap: wrap; gap: 14px; margin-bottom: 16px; }
.trust { font-size: 13px; color: var(--ink-dim); margin: 6px 0 0; }

.btn {
  display: inline-flex; align-items: center; justify-content: center;
  padding: 12px 22px; border-radius: 11px; font-size: 15px; font-weight: 600;
  border: 1px solid transparent; cursor: pointer; transition: transform 0.12s ease, box-shadow 0.2s ease, background 0.2s ease;
}
.btn:active { transform: translateY(1px); }
.btn.primary { background: linear-gradient(135deg, var(--brand), var(--brand-2)); color: #fff; box-shadow: 0 10px 26px rgba(124, 108, 255, 0.35); }
.btn.primary:hover { box-shadow: 0 14px 32px rgba(255, 90, 126, 0.4); }
.btn.ghost { background: transparent; border-color: var(--line); color: var(--ink-soft); }
.btn.ghost:hover { color: var(--ink); border-color: var(--ink-dim); }
.btn.wide { width: 100%; }

/* ---------- builder ---------- */
.builder { padding: 16px 0 64px; }
.grid { display: grid; grid-template-columns: 0.85fr 1.15fr; gap: 24px; align-items: start; }
.panel {
  background: linear-gradient(180deg, var(--panel), var(--bg-soft));
  border: 1px solid var(--line); border-radius: var(--radius);
  padding: 22px; box-shadow: var(--shadow);
}
.input-panel { position: sticky; top: 76px; }
.panel-title { margin: 0 0 18px; font-size: 16px; color: var(--ink); display: flex; align-items: center; gap: 8px; }

.field { display: flex; flex-direction: column; gap: 7px; margin-bottom: 15px; font-size: 14px; }
.field > span { color: var(--ink-soft); font-weight: 600; }
.field .hint { font-style: normal; font-weight: 400; color: var(--ink-dim); font-size: 12.5px; margin-left: 6px; }
.field-row { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
input, select, textarea {
  width: 100%; padding: 11px 13px; border-radius: 10px;
  background: var(--panel-2); border: 1px solid var(--line); color: var(--ink);
  font-size: 14.5px; font-family: inherit; transition: border 0.15s ease, box-shadow 0.15s ease;
}
input::placeholder, textarea::placeholder { color: #5c6178; }
input:focus, select:focus, textarea:focus {
  outline: none; border-color: var(--brand-2);
  box-shadow: 0 0 0 3px rgba(124, 108, 255, 0.18);
}
textarea { resize: vertical; line-height: 1.55; }
select { appearance: none; background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath fill='%23818699' d='M6 8L0 0h12z'/%3E%3C/svg%3E"); background-repeat: no-repeat; background-position: right 14px center; padding-right: 34px; }

.form-actions { display: flex; gap: 12px; margin-top: 6px; }
.form-actions .btn.primary { flex: 1; }
.form-note { font-size: 13px; color: var(--warn); margin: 12px 0 0; min-height: 18px; }

/* ---------- output ---------- */
.output-head { display: flex; align-items: center; justify-content: space-between; margin-bottom: 8px; }
.output-tools { display: flex; gap: 9px; }
.chip-btn {
  background: var(--panel-2); border: 1px solid var(--line); color: var(--ink-soft);
  font-size: 13px; padding: 6px 12px; border-radius: 8px; cursor: pointer; font-family: inherit;
}
.chip-btn:hover { color: var(--ink); border-color: var(--brand-2); }

.empty-state { text-align: center; padding: 36px 16px; color: var(--ink-dim); }
.empty-icon { font-size: 40px; color: var(--brand-2); opacity: 0.5; margin-bottom: 10px; }
.empty-list { list-style: none; padding: 0; margin: 18px auto 0; max-width: 340px; text-align: left; font-size: 14px; color: var(--ink-soft); }
.empty-list li { padding: 7px 0; border-bottom: 1px dashed var(--line); }

/* ---------- result blocks ---------- */
.result { display: flex; flex-direction: column; gap: 22px; }
.brief-meta { display: flex; flex-wrap: wrap; gap: 8px; padding-bottom: 4px; }
.tag { font-size: 12.5px; padding: 4px 11px; border-radius: 999px; background: var(--panel-2); border: 1px solid var(--line); color: var(--ink-soft); }
.tag.brand { color: var(--brand); border-color: rgba(255, 90, 126, 0.4); }
.tag.accent { color: var(--accent); border-color: rgba(46, 230, 200, 0.4); }

.block { border-top: 1px solid var(--line); padding-top: 18px; }
.block h3 { margin: 0 0 4px; font-size: 16px; display: flex; align-items: center; gap: 9px; }
.block .block-sub { margin: 0 0 14px; font-size: 13px; color: var(--ink-dim); }
.block-ico { font-size: 17px; }

/* angle cards */
.angle { background: var(--panel-2); border: 1px solid var(--line); border-radius: 12px; padding: 14px 16px; margin-bottom: 12px; }
.angle-top { display: flex; align-items: baseline; justify-content: space-between; gap: 10px; margin-bottom: 7px; }
.angle-name { font-weight: 700; font-size: 14.5px; }
.angle-fw { font-size: 12px; color: var(--brand-2); white-space: nowrap; }
.angle-hook { font-size: 15px; color: var(--ink); margin: 2px 0 9px; line-height: 1.5; }
.angle-hook::before { content: "“"; color: var(--brand); }
.angle-hook::after { content: "”"; color: var(--brand); }
.angle-foot { display: flex; flex-wrap: wrap; gap: 8px; font-size: 12.5px; color: var(--ink-dim); }
.angle-foot span { background: rgba(255,255,255,0.03); border: 1px solid var(--line); padding: 3px 9px; border-radius: 7px; }

/* audience */
.aud { background: var(--panel-2); border: 1px solid var(--line); border-radius: 12px; padding: 14px 16px; margin-bottom: 12px; }
.aud-name { font-weight: 700; font-size: 14.5px; margin-bottom: 8px; color: var(--accent); }
.aud-line { font-size: 14px; margin: 5px 0; color: var(--ink-soft); }
.aud-line b { color: var(--ink); font-weight: 600; }

/* storyboard */
.shot { display: grid; grid-template-columns: 64px 1fr; gap: 14px; padding: 13px 0; border-bottom: 1px dashed var(--line); }
.shot:last-child { border-bottom: none; }
.shot-time { font-size: 13px; font-weight: 700; color: var(--brand); }
.shot-time small { display: block; color: var(--ink-dim); font-weight: 400; font-size: 11.5px; margin-top: 3px; }
.shot-body p { margin: 0 0 6px; font-size: 14px; }
.shot-body .lbl { color: var(--ink-dim); font-size: 12.5px; margin-right: 6px; }
.shot-body .vo { color: var(--ink); }
.shot-body .cap { color: var(--accent); }
.shot-body .scn { color: var(--ink-soft); }

/* test matrix */
.test { background: var(--panel-2); border: 1px solid var(--line); border-left: 3px solid var(--brand-2); border-radius: 10px; padding: 13px 15px; margin-bottom: 11px; }
.test-h { font-weight: 700; font-size: 14px; margin-bottom: 6px; }
.test-row { font-size: 13.5px; margin: 4px 0; color: var(--ink-soft); }
.test-row b { color: var(--ink); }
.test-row .a { color: var(--brand); }
.test-row .b { color: var(--accent); }

/* ---------- how / frameworks ---------- */
.section-title { font-size: 24px; margin: 0 0 6px; }
.section-sub { color: var(--ink-soft); margin: 0 0 26px; }
.how { padding: 50px 0; border-top: 1px solid var(--line); }
.how-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; margin-top: 26px; }
.how-card { background: var(--panel); border: 1px solid var(--line); border-radius: 12px; padding: 20px; }
.how-num { display: grid; place-items: center; width: 30px; height: 30px; border-radius: 8px; background: linear-gradient(135deg, var(--brand), var(--brand-2)); color: #fff; font-weight: 700; margin-bottom: 12px; }
.how-card h3 { margin: 0 0 8px; font-size: 15.5px; }
.how-card p { margin: 0; font-size: 13.5px; color: var(--ink-soft); }

.frameworks { padding: 50px 0 70px; border-top: 1px solid var(--line); }
.fw-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 14px; }
.fw-item { background: var(--panel); border: 1px solid var(--line); border-radius: 11px; padding: 15px 17px; }
.fw-item h4 { margin: 0 0 5px; font-size: 14.5px; color: var(--ink); }
.fw-item h4 .fw-en { color: var(--brand-2); font-size: 12px; font-weight: 500; margin-left: 7px; }
.fw-item p { margin: 0; font-size: 13px; color: var(--ink-soft); }

/* ---------- footer ---------- */
.footer { border-top: 1px solid var(--line); padding: 30px 0; background: rgba(0,0,0,0.2); }
.footer-inner { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 16px; font-size: 13px; color: var(--ink-dim); }
.footer-inner b { color: var(--ink-soft); }
.footer-inner p { margin: 4px 0 0; }
.footer-meta { text-align: right; max-width: 420px; }

/* ---------- responsive ---------- */
@media (max-width: 900px) {
  .grid { grid-template-columns: 1fr; }
  .input-panel { position: static; }
  .how-grid { grid-template-columns: 1fr 1fr; }
  .fw-grid { grid-template-columns: 1fr; }
  .topnav { display: none; }
}
@media (max-width: 560px) {
  .hero { padding: 44px 0 28px; }
  .how-grid { grid-template-columns: 1fr; }
  .field-row { grid-template-columns: 1fr; }
  .footer-meta { text-align: left; }
  .shot { grid-template-columns: 54px 1fr; }
}