/* ============================================
   style-v4.css — 黑金霓虹风 · Apple发布会感
   ============================================ */

:root {
  --gold: #f5c842;
  --gold-light: #fde68a;
  --gold-dark: #d4a017;
  --neon-cyan: #00e5ff;
  --neon-purple: #bf5af2;
  --neon-green: #30d158;
  --bg-dark: #080c14;
  --bg-card: #0d1220;
  --bg-card2: #111827;
  --text: #f0f4ff;
  --text-secondary: #c8d3e8;
  --border: rgba(255,255,255,.08);
  --border-gold: rgba(245,200,66,.25);
  --radius: 16px;
  --shadow-gold: 0 0 30px rgba(245,200,66,.15);
  --shadow-neon: 0 0 40px rgba(0,229,255,.12);
  --primary: #f5c842;
  --primary-dark: #d4a017;
}

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

body {
  font-family:'Inter',-apple-system,'PingFang SC','Microsoft YaHei',sans-serif;
  background:var(--bg-dark);
  color:var(--text);
  line-height:1.65;
  -webkit-font-smoothing:antialiased;
}

/* ============ HERO ============ */
.hero {
  background: #080c14;
  padding: 88px 24px 72px;
  text-align: center;
  position: relative;
  overflow: hidden;
}

/* 背景光晕 */
.hero::before {
  content: '';
  position: absolute;
  top: -200px; left: 50%;
  transform: translateX(-50%);
  width: 900px; height: 600px;
  background: radial-gradient(ellipse at center,
    rgba(245,200,66,.18) 0%,
    rgba(191,90,242,.10) 40%,
    transparent 70%);
  pointer-events: none;
}

.hero::after {
  content: '';
  position: absolute;
  bottom: 0; left: 0; right: 0;
  height: 1px;
  background: linear-gradient(90deg,
    transparent, rgba(245,200,66,.4), rgba(0,229,255,.3), transparent);
}

.hero-inner {
  position: relative;
  max-width: 760px;
  margin: 0 auto;
  z-index: 1;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(245,200,66,.1);
  border: 1px solid rgba(245,200,66,.35);
  padding: 7px 22px;
  border-radius: 30px;
  font-size: .82em;
  font-weight: 700;
  color: var(--gold);
  margin-bottom: 32px;
  letter-spacing: .04em;
  text-transform: uppercase;
}

.hero h1 {
  font-size: 3em;
  font-weight: 900;
  line-height: 1.2;
  color: #fff;
  margin-bottom: 20px;
  letter-spacing: -.03em;
}

.hero-accent {
  background: linear-gradient(135deg, #f5c842 0%, #fde68a 40%, #00e5ff 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-sub {
  font-size: 1.05em;
  color: rgba(255,255,255,.88);
  max-width: 540px;
  margin: 0 auto 44px;
  line-height: 1.7;
  font-size: 1.1em;
}

.hero-tags {
  display: flex;
  justify-content: center;
  gap: 14px;
  flex-wrap: wrap;
}

.hero-tag {
  background: rgba(255,255,255,.04);
  border: 1px solid var(--border);
  padding: 10px 24px;
  border-radius: 12px;
  font-size: .9em;
  font-weight: 500;
  color: rgba(255,255,255,.7);
  transition: all .25s;
}

.hero-tag:hover {
  border-color: rgba(245,200,66,.4);
  color: var(--text);
}

.hero-tag span {
  color: var(--gold);
  font-weight: 800;
}

/* ============ VALUE BAR ============ */
.value-bar {
  background: #060a10;
  padding: 72px 24px;
  position: relative;
}

.value-bar::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(245,200,66,.3), transparent);
}

.value-bar-inner { max-width: 1200px; margin: 0 auto; }

.split-container {
  display: flex;
  height: 420px;
  border-radius: 20px;
  overflow: hidden;
  box-shadow: 0 0 0 1px rgba(255,255,255,.06), 0 40px 80px rgba(0,0,0,.6);
}

/* 左侧：人工方式 */
.left-side {
  flex: 1;
  background: linear-gradient(145deg, #1a0a0a, #2d1515);
  padding: 50px 44px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  position: relative;
  overflow: hidden;
}

.left-side::before {
  content: '';
  position: absolute;
  top: -60px; right: -60px;
  width: 200px; height: 200px;
  background: radial-gradient(circle, rgba(239,68,68,.15) 0%, transparent 70%);
}

.left-content { position: relative; z-index: 1; color: #fff; }

.side-label {
  font-size: 1em;
  font-weight: 800;
  margin-bottom: 32px;
  color: #f87171;
  letter-spacing: .08em;
  text-transform: uppercase;
  display: flex;
  align-items: center;
  gap: 8px;
}

.side-label::before {
  content: '';
  display: inline-block;
  width: 24px; height: 2px;
  background: #f87171;
}

.pain-item { margin-bottom: 28px; }

.pain-title {
  font-size: 1.15em;
  font-weight: 700;
  margin-bottom: 6px;
  color: #fca5a5;
}

.pain-desc {
  font-size: .92em;
  color: rgba(255,255,255,.70);
  line-height: 1.6;
}

.pain-desc strong {
  font-size: 1.25em;
  color: #f87171;
  font-weight: 900;
}

/* 中间分隔 */
.divider {
  width: 72px;
  background: linear-gradient(180deg, #0d1220, #111827);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2.4em;
  font-weight: 900;
  color: var(--gold);
  position: relative;
  flex-shrink: 0;
  box-shadow: 0 0 40px rgba(245,200,66,.2);
}

.divider::before {
  content: '';
  position: absolute;
  left: 0; top: 50%;
  transform: translateY(-50%);
  width: 0; height: 0;
  border-top: 18px solid transparent;
  border-bottom: 18px solid transparent;
  border-left: 18px solid #2d1515;
}

.divider::after {
  content: '';
  position: absolute;
  right: 0; top: 50%;
  transform: translateY(-50%);
  width: 0; height: 0;
  border-top: 18px solid transparent;
  border-bottom: 18px solid transparent;
  border-right: 18px solid #0a1f14;
}

/* 右侧：AI方式 */
.right-side {
  flex: 1;
  background: linear-gradient(145deg, #0a1f14, #0d2a1a);
  padding: 50px 44px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  position: relative;
  overflow: hidden;
}

.right-side::before {
  content: '';
  position: absolute;
  bottom: -60px; left: -60px;
  width: 200px; height: 200px;
  background: radial-gradient(circle, rgba(48,209,88,.15) 0%, transparent 70%);
}

.right-content { position: relative; z-index: 1; color: #fff; }

.right-content .side-label {
  color: var(--neon-green);
}

.right-content .side-label::before {
  background: var(--neon-green);
}

.advantage-item { margin-bottom: 28px; }

.advantage-title {
  font-size: 1.15em;
  font-weight: 700;
  margin-bottom: 6px;
  color: #6ee7b7;
}

.advantage-desc {
  font-size: .92em;
  color: rgba(255,255,255,.80);
  line-height: 1.6;
}

.highlight {
  font-size: 1.3em;
  font-weight: 900;
  color: var(--neon-green);
  text-shadow: 0 0 20px rgba(48,209,88,.4);
}

/* ============ TABS ============ */
.tabs {
  display: flex;
  justify-content: center;
  background: rgba(8,12,20,.95);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
}

.tab {
  padding: 18px 48px;
  cursor: pointer;
  font-size: .95em;
  font-weight: 600;
  color: var(--text-secondary);
  border-bottom: 2px solid transparent;
  transition: all .25s;
  user-select: none;
  letter-spacing: .02em;
}

.tab:hover { color: var(--text); }

.tab.active {
  color: var(--gold);
  border-bottom-color: var(--gold);
  text-shadow: 0 0 20px rgba(245,200,66,.4);
}

.tab-content { display: none; }
.tab-content.active { display: block; }

/* ============ CONTAINER ============ */
.container {
  max-width: 1080px;
  margin: 0 auto;
  padding: 56px 24px;
}

.sec-title {
  font-size: 1.5em;
  font-weight: 800;
  margin-bottom: 8px;
  color: var(--text);
  letter-spacing: -.01em;
}

.sec-desc {
  color: var(--text-secondary);
  margin-bottom: 32px;
  font-size: .92em;
}

/* ============ OVERVIEW GRID ============ */
.overview-grid {
  display: grid;
  grid-template-columns: repeat(4,1fr);
  gap: 16px;
  margin-bottom: 56px;
}

.ov-card {
  background: var(--bg-card);
  border-radius: 14px;
  padding: 20px 18px;
  border: 1px solid var(--border);
  transition: all .3s;
  cursor: default;
  position: relative;
  overflow: hidden;
}

.ov-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--gold), var(--neon-cyan));
  opacity: 0;
  transition: opacity .3s;
}

.ov-card:hover {
  border-color: rgba(245,200,66,.3);
  transform: translateY(-4px);
  box-shadow: 0 20px 40px rgba(0,0,0,.4), var(--shadow-gold);
}

.ov-card:hover::before { opacity: 1; }

.ov-icon { font-size: 1.6em; margin-bottom: 10px; }

.ov-name {
  font-weight: 700;
  font-size: .9em;
  margin-bottom: 8px;
  color: var(--text);
  display: flex;
  align-items: center;
  gap: 6px;
}

.ov-count {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--gold);
  color: #000;
  font-size: .7em;
  font-weight: 800;
  min-width: 18px;
  height: 18px;
  padding: 0 5px;
  border-radius: 9px;
}

.ov-value {
  font-size: .88em;
  font-weight: 800;
  color: var(--gold);
  margin-bottom: 4px;
}

.ov-people {
  font-size: .8em;
  color: #f87171;
  font-weight: 600;
  margin-bottom: 4px;
  line-height: 1.3;
}

.ov-effect {
  font-size: .8em;
  color: var(--text-secondary);
  line-height: 1.3;
}

/* ============ CASE CARD ============ */
.case-card {
  background: var(--bg-card);
  border-radius: var(--radius);
  margin-bottom: 32px;
  border: 1px solid var(--border);
  overflow: hidden;
  transition: all .3s;
  position: relative;
}

.case-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(245,200,66,.5), rgba(0,229,255,.3), transparent);
  opacity: 0;
  transition: opacity .3s;
}

.case-card:hover {
  border-color: rgba(245,200,66,.2);
  box-shadow: 0 24px 60px rgba(0,0,0,.5), 0 0 0 1px rgba(245,200,66,.1);
  transform: translateY(-2px);
}

.case-card:hover::before { opacity: 1; }

.case-header { padding: 28px 32px 0; }

.case-tag {
  display: inline-block;
  padding: 4px 14px;
  border-radius: 20px;
  font-size: .75em;
  font-weight: 700;
  margin-bottom: 10px;
  letter-spacing: .04em;
  text-transform: uppercase;
}

.tag-visual  { background: rgba(99,102,241,.15); color: #a5b4fc; border: 1px solid rgba(99,102,241,.3); }
.tag-detail  { background: rgba(0,229,255,.1);   color: #67e8f9; border: 1px solid rgba(0,229,255,.25); }
.tag-copy    { background: rgba(245,200,66,.12); color: var(--gold); border: 1px solid rgba(245,200,66,.3); }
.tag-service { background: rgba(191,90,242,.12); color: #e879f9; border: 1px solid rgba(191,90,242,.3); }
.tag-data    { background: rgba(48,209,88,.1);   color: #6ee7b7; border: 1px solid rgba(48,209,88,.25); }
.tag-cross   { background: rgba(251,146,60,.1);  color: #fdba74; border: 1px solid rgba(251,146,60,.25); }
.tag-pack    { background: rgba(244,63,94,.1);   color: #fda4af; border: 1px solid rgba(244,63,94,.25); }

.case-title {
  font-size: 1.25em;
  font-weight: 800;
  margin-bottom: 6px;
  color: var(--text);
  letter-spacing: -.01em;
}

.case-meta {
  color: var(--text-secondary);
  font-size: .85em;
  margin-bottom: 16px;
}

/* Images */
.case-images { padding: 0 32px 20px; }

.img-row {
  display: flex;
  gap: 12px;
  overflow-x: auto;
  scrollbar-width: thin;
  scrollbar-color: rgba(245,200,66,.3) transparent;
}

.img-wrap {
  position: relative;
  flex-shrink: 0;
  border-radius: 12px;
  overflow: hidden;
  border: 1px solid var(--border);
  cursor: pointer;
  background: #0a0e18;
  transition: all .25s;
}

.img-wrap:hover {
  border-color: rgba(245,200,66,.4);
  box-shadow: 0 0 20px rgba(245,200,66,.15);
}

.img-wrap img { display: block; max-height: 340px; width: auto; max-width: 100%; }
.img-wrap.full img { width: 100%; max-height: 460px; object-fit: contain; }

.img-label {
  position: absolute;
  top: 8px; left: 8px;
  padding: 3px 10px;
  border-radius: 6px;
  font-size: .72em;
  font-weight: 700;
}

.label-before  { background: rgba(239,68,68,.85);  color: #fff; }
.label-after   { background: rgba(48,209,88,.85);   color: #000; }
.label-compare { background: rgba(0,229,255,.85);   color: #000; }
.label-demo    { background: rgba(191,90,242,.85);  color: #fff; }

.no-image {
  padding: 20px 32px;
  background: rgba(255,255,255,.02);
  color: var(--text-secondary);
  font-size: .88em;
  border-top: 1px solid var(--border);
}

/* ============ CASE BODY & COMPARE ============ */
.case-body { padding: 0 32px 20px; }

.compare-row {
  display: flex;
  gap: 0;
  align-items: stretch;
  border-radius: 12px;
  overflow: hidden;
  border: 1px solid var(--border);
  margin-bottom: 16px;
}

.compare-side { flex: 1; padding: 20px 22px; }
.side-before { background: rgba(239,68,68,.05); border-right: 1px solid var(--border); }
.side-after  { background: rgba(48,209,88,.05); }

.side-badge {
  font-size: .75em;
  font-weight: 700;
  color: var(--text-secondary);
  margin-bottom: 10px;
  display: inline-block;
  padding: 3px 10px;
  background: rgba(255,255,255,.05);
  border-radius: 6px;
  border: 1px solid var(--border);
  letter-spacing: .04em;
}

.side-badge-ai {
  color: var(--neon-green);
  border-color: rgba(48,209,88,.3);
  background: rgba(48,209,88,.08);
}

.compare-side p { font-size: .88em; color: rgba(255,255,255,.85); }

.side-effect {
  margin-top: 12px;
  padding: 10px 14px;
  background: rgba(48,209,88,.1);
  border-radius: 8px;
  font-size: .88em;
  font-weight: 700;
  color: var(--neon-green);
  border: 1px solid rgba(48,209,88,.2);
}

.compare-arrow {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 0 16px;
  background: rgba(245,200,66,.05);
  font-size: .75em;
  font-weight: 800;
  color: var(--gold);
  gap: 2px;
}

.compare-arrow span { font-size: 1.6em; }

/* Case Footer */
.case-footer {
  padding: 16px 32px;
  border-top: 1px solid var(--border);
  font-size: .85em;
  color: var(--text-secondary);
  background: rgba(255,255,255,.02);
}

.fit-tag {
  display: inline-block;
  background: rgba(245,200,66,.1);
  color: var(--gold);
  padding: 2px 10px;
  border-radius: 6px;
  font-size: .78em;
  font-weight: 600;
  margin-right: 4px;
  border: 1px solid rgba(245,200,66,.25);
}

/* Info blocks */
.case-info { display: grid; grid-template-columns: 1fr 1fr; }
.info-block { padding: 20px 26px; }
.info-block:nth-child(1) { border-right: 1px solid var(--border); border-top: 1px solid var(--border); }
.info-block:nth-child(2) { border-top: 1px solid var(--border); }
.info-block:nth-child(3) { border-right: 1px solid var(--border); border-top: 1px solid var(--border); }
.info-block:nth-child(4) { border-top: 1px solid var(--border); }

.info-label {
  font-size: .7em;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  margin-bottom: 6px;
}

.info-block.pain     { background: rgba(239,68,68,.05); }
.info-block.pain .info-label     { color: #f87171; }
.info-block.solution { background: rgba(0,229,255,.04); }
.info-block.solution .info-label { color: var(--neon-cyan); }
.info-block.effect   { background: rgba(48,209,88,.04); }
.info-block.effect .info-label   { color: var(--neon-green); }
.info-block.fit      { background: rgba(245,200,66,.04); }
.info-block.fit .info-label      { color: var(--gold); }
.info-block p { font-size: .88em; color: rgba(255,255,255,.65); }

/* ============ LIGHTBOX ============ */
.img-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,.92);
  z-index: 1000;
  align-items: center;
  justify-content: center;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.img-overlay.show { display: flex; }

.img-overlay img {
  max-width: 94%;
  max-height: 94%;
  border-radius: 12px;
  object-fit: contain;
  box-shadow: 0 0 80px rgba(245,200,66,.15);
}

.lb-close {
  position: absolute;
  top: 20px; right: 28px;
  color: #fff;
  font-size: 24px;
  cursor: pointer;
  opacity: .5;
  transition: all .2s;
  width: 44px; height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: rgba(255,255,255,.08);
  border: 1px solid rgba(255,255,255,.15);
}

.lb-close:hover { opacity: 1; background: rgba(245,200,66,.15); border-color: rgba(245,200,66,.4); }

/* ============ FLOW STEPS ============ */
.flow-wrap {
  display: flex;
  align-items: stretch;
  gap: 0;
  margin-bottom: 56px;
}

.flow-card {
  flex: 1;
  background: var(--bg-card);
  border-radius: 14px;
  padding: 26px 22px;
  border: 1px solid var(--border);
  transition: all .3s;
  position: relative;
  overflow: hidden;
}

.flow-card:hover {
  border-color: rgba(245,200,66,.3);
  box-shadow: 0 0 30px rgba(245,200,66,.1);
}

.flow-arrow {
  display: flex;
  align-items: center;
  padding: 0 8px;
  color: var(--gold);
  font-size: 1.4em;
  opacity: .5;
}

.step-badge {
  width: 38px; height: 38px;
  background: linear-gradient(135deg, var(--gold), var(--gold-dark));
  color: #000;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 900;
  margin-bottom: 14px;
  font-size: .95em;
}

.flow-card h3 {
  font-size: 1.05em;
  font-weight: 700;
  margin-bottom: 4px;
  color: var(--text);
}

.step-time {
  background: rgba(245,200,66,.12);
  color: var(--gold);
  padding: 2px 10px;
  border-radius: 8px;
  font-size: .75em;
  font-weight: 700;
  margin-left: 6px;
  border: 1px solid rgba(245,200,66,.25);
}

.flow-card .step-desc {
  color: var(--text-secondary);
  font-size: .88em;
  margin: 10px 0;
}

.step-output {
  padding: 10px 14px;
  background: rgba(245,200,66,.06);
  border-left: 3px solid var(--gold);
  border-radius: 0 8px 8px 0;
  font-size: .82em;
  color: rgba(255,255,255,.6);
  margin-top: 12px;
}

/* ============ FORM ============ */
.form-section {
  background: var(--bg-card);
  border-radius: var(--radius);
  padding: 36px;
  border: 1px solid var(--border);
  margin-bottom: 28px;
  position: relative;
  overflow: hidden;
}

.form-section::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(245,200,66,.4), transparent);
}

.form-section h3 {
  font-size: 1.1em;
  font-weight: 800;
  margin-bottom: 20px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--border);
  color: var(--text);
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-bottom: 16px;
}

.form-group {
  display: flex;
  flex-direction: column;
  margin-bottom: 4px;
}

.form-group label {
  font-size: .82em;
  font-weight: 600;
  color: #d0daf0;
  margin-bottom: 6px;
  letter-spacing: .02em;
}

.form-group input,
.form-group select,
.form-group textarea {
  padding: 11px 15px;
  border: 1px solid var(--border);
  border-radius: 10px;
  font-size: .9em;
  outline: none;
  transition: all .2s;
  font-family: inherit;
  background: rgba(255,255,255,.04);
  color: var(--text);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  border-color: rgba(245,200,66,.5);
  box-shadow: 0 0 0 3px rgba(245,200,66,.08);
  background: rgba(245,200,66,.03);
}

.form-group select option { background: #1a2035; color: var(--text); }

.checkbox-group {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.checkbox-group label {
  display: flex;
  align-items: center;
  gap: 5px;
  font-size: .85em;
  padding: 6px 14px;
  border: 1px solid var(--border);
  border-radius: 8px;
  cursor: pointer;
  transition: all .15s;
  color: var(--text-secondary);
  background: rgba(255,255,255,.03);
}

.checkbox-group label:has(input:checked) {
  background: rgba(245,200,66,.12);
  border-color: rgba(245,200,66,.4);
  color: var(--gold);
}

.checkbox-group input { display: none; }

.radio-group {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.radio-group label {
  display: flex;
  align-items: center;
  gap: 5px;
  font-size: .85em;
  padding: 7px 16px;
  border: 1px solid var(--border);
  border-radius: 8px;
  cursor: pointer;
  transition: all .15s;
  color: var(--text-secondary);
  background: rgba(255,255,255,.03);
}

.radio-group label:has(input:checked) {
  background: linear-gradient(135deg, var(--gold), var(--gold-dark));
  color: #000;
  border-color: var(--gold);
  font-weight: 700;
}

.radio-group input { display: none; }

/* ============ TABLES ============ */
.data-table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  font-size: .85em;
  margin: 16px 0;
  border-radius: 12px;
  overflow: hidden;
  border: 1px solid var(--border);
}

.data-table th {
  background: rgba(245,200,66,.08);
  color: var(--text);
  padding: 12px 16px;
  text-align: left;
  font-weight: 700;
  border-bottom: 1px solid var(--border);
  letter-spacing: .02em;
}

.data-table td {
  padding: 10px 16px;
  border-bottom: 1px solid rgba(255,255,255,.04);
  color: rgba(255,255,255,.75);
}

.data-table tr:last-child td { border-bottom: none; }
.data-table .highlight { background: rgba(245,200,66,.04); }
.score-cell { font-weight: 800; color: var(--gold); font-size: 1.05em; }

.data-table input[type="text"],
.data-table input[type="number"] {
  width: 100%;
  padding: 5px 10px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: .88em;
  background: rgba(255,255,255,.05);
  color: var(--text);
}

.data-table input[type="number"] { width: 60px; text-align: center; }

/* ============ BUTTONS ============ */
.btn {
  padding: 11px 26px;
  border-radius: 10px;
  font-size: .9em;
  font-weight: 700;
  cursor: pointer;
  border: none;
  transition: all .2s;
  letter-spacing: .02em;
}

.btn-primary {
  background: linear-gradient(135deg, var(--gold) 0%, #e8b820 100%);
  color: #000;
  box-shadow: 0 4px 20px rgba(245,200,66,.3);
}

.btn-primary:hover {
  background: linear-gradient(135deg, var(--gold-light) 0%, var(--gold) 100%);
  box-shadow: 0 8px 30px rgba(245,200,66,.45);
  transform: translateY(-1px);
}

.btn-secondary {
  background: rgba(255,255,255,.06);
  color: var(--text-secondary);
  border: 1px solid var(--border);
}

.btn-secondary:hover {
  border-color: rgba(245,200,66,.4);
  color: var(--gold);
  background: rgba(245,200,66,.06);
}

.btn-outline {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-secondary);
}

.btn-outline:hover {
  border-color: rgba(245,200,66,.4);
  color: var(--gold);
}

/* ============ COMPARE WRAP ============ */
.compare-wrap {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin: 20px 0 40px;
}

.compare-card {
  padding: 24px;
  border-radius: 14px;
  border: 1px solid;
}

.compare-card.old {
  background: rgba(239,68,68,.06);
  border-color: rgba(239,68,68,.25);
}

.compare-card.new {
  background: rgba(48,209,88,.06);
  border-color: rgba(48,209,88,.25);
}

.compare-card h4 { font-size: .95em; font-weight: 700; margin-bottom: 10px; }
.compare-card.old h4 { color: #f87171; }
.compare-card.new h4 { color: var(--neon-green); }
.compare-card p { font-size: .88em; color: rgba(255,255,255,.65); line-height: 1.7; }

/* ============ SCENE GRID ============ */
.scene-grid {
  display: grid;
  grid-template-columns: repeat(4,1fr);
  gap: 14px;
  margin-top: 16px;
}

.scene-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 18px;
  text-align: center;
  transition: all .25s;
}

.scene-card:hover {
  border-color: rgba(245,200,66,.3);
  box-shadow: 0 0 20px rgba(245,200,66,.1);
  transform: translateY(-3px);
}

.sc-name { font-weight: 600; font-size: .88em; margin-bottom: 4px; color: var(--text); }
.sc-effect { font-weight: 800; font-size: 1em; margin-bottom: 2px; color: var(--gold); }
.sc-time { font-size: .75em; color: var(--text-secondary); }

/* ============ EXAMPLE BOX ============ */
.example-box {
  background: rgba(245,200,66,.04);
  border: 1px dashed rgba(245,200,66,.25);
  border-radius: 14px;
  padding: 24px;
  margin: 16px 0;
}

.example-box h4 {
  font-size: .95em;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--gold);
}

.sop-note {
  padding: 10px 14px;
  background: rgba(48,209,88,.08);
  border-radius: 8px;
  color: var(--neon-green);
  font-weight: 600;
  font-size: .88em;
  margin-top: 10px;
  border: 1px solid rgba(48,209,88,.2);
}

/* ============ LOADING ============ */
.loading-spinner {
  width: 50px; height: 50px;
  border: 3px solid rgba(255,255,255,.08);
  border-top-color: var(--gold);
  border-radius: 50%;
  animation: spin 1s linear infinite;
  margin: 0 auto;
}

@keyframes spin { to { transform: rotate(360deg); } }

/* ============ RESPONSIVE ============ */
@media(max-width:768px) {
  .hero h1 { font-size: 2em; }
  .overview-grid { grid-template-columns: repeat(2,1fr); }
  .case-info { grid-template-columns: 1fr; }
  .info-block:nth-child(odd) { border-right: none; }
  .flow-wrap { flex-direction: column; }
  .flow-arrow { justify-content: center; transform: rotate(90deg); padding: 6px 0; }
  .form-row { grid-template-columns: 1fr; }
  .compare-wrap { grid-template-columns: 1fr; }
  .scene-grid { grid-template-columns: repeat(2,1fr); }
  .tab { padding: 14px 22px; font-size: .88em; }
  .case-header,.case-images,.case-body { padding-left: 20px; padding-right: 20px; }
  .compare-row { flex-direction: column; }
  .compare-arrow { flex-direction: row; padding: 8px 0; }
  .case-footer { padding-left: 20px; padding-right: 20px; }
  .split-container { height: auto; flex-direction: column; }
  .divider { width: 100%; height: 56px; }
  .divider::before,.divider::after { display: none; }
  .form-section { padding: 24px 20px; }
}