@import './tokens.css';

/* ════════════════════════════════════════════
   GLOBAL RESET & BASE
════════════════════════════════════════════ */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html, body {
  max-width: 100%;
  overflow-x: hidden;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family-base);
  color: var(--color-text-primary);
  font-size: var(--font-size-md);
  line-height: var(--line-height-base);
  -webkit-font-smoothing: antialiased;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

ul, ol {
  list-style: none;
}

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

button {
  cursor: pointer;
  border: none;
  background: none;
  font-family: inherit;
}

/* ── Container ── */
.container {
  max-width: var(--container-max-width);
  margin: 0 auto;
  width: 100%;
  box-sizing: border-box;
  /* Desktop: max-width 1200px, centered, no side padding */
}

@media (max-width: 1024px) {
  .container { padding: 0 var(--container-padding-tablet); }
}
@media (max-width: 768px) {
  .container { padding: 0 var(--container-padding-mobile); }
}

/* ── Section header shared ── */
.section-header {
  text-align: center;
  margin-bottom: var(--space-xl);
}
.section-header--left {
  text-align: left;
}
.section-eyebrow {
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-sm);
}
.section-title {
  font-size: var(--font-size-h2);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-primary);
  line-height: var(--line-height-tight);
  margin-bottom: var(--space-md);
}
.section-desc {
  font-size: var(--font-size-md);
  color: var(--color-text-secondary);
  max-width: 65ch;
  margin: 0 auto;
  line-height: var(--line-height-loose);
}

/* ── Shared card section title bar ── */
.card-section-title {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: var(--space-md);
}
.card-section-bar {
  width: 5px;
  height: 24px;
  background: var(--color-primary);
  border-radius: 1px;
  flex-shrink: 0;
}
.card-section-title span {
  font-size: var(--font-size-h3);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
}

/* ── Buttons ── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-family: var(--font-family-base);
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-bold);
  line-height: 1;
  min-height: 44px;
  min-width: 44px;
  padding: 16px 32px;
  border-radius: var(--radius-btn);
  cursor: pointer;
  transition: filter 0.2s ease, box-shadow 0.2s ease, transform 0.2s ease;
  border: 2px solid transparent;
}
.btn--primary {
  background: var(--color-primary);
  color: var(--color-text-white);
  box-shadow: var(--shadow-btn);
}
.btn--primary:hover {
  filter: brightness(0.88);
}
.btn--outline {
  background: var(--color-text-white);
  color: var(--color-text-primary);
  border-color: var(--color-border);
  box-shadow: var(--shadow-btn-secondary);
}
.btn--outline:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}
.btn--full {
  width: 100%;
}
.btn--submit {
  border-radius: var(--radius-md);
}

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; }
}

/* ════════════════════════════════════════════
   SECTION 1 — NAVIGATION
════════════════════════════════════════════ */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  width: 100%;
  height: var(--nav-height);
  background: var(--color-nav-bg);
}

.nav__inner {
  display: flex;
  align-items: center;
  height: 100%;
  gap: 40px;
}

.nav__logo {
  flex-shrink: 0;
  min-height: 44px;
  display: flex;
  align-items: center;
}
.nav__logo img {
  width: 144px;
  height: 40px;
  object-fit: contain;
}

.nav__links {
  display: flex;
  align-items: center;
  gap: 48px;
  flex: 1;
  justify-content: center;
}
.nav__link {
  font-size: var(--font-size-md);
  font-weight: var(--font-weight-regular);
  color: var(--color-text-white);
  line-height: 1.43;
  white-space: nowrap;
  min-height: 44px;
  display: flex;
  align-items: center;
  transition: color 0.2s ease;
}
.nav__link:hover {
  color: var(--color-accent-yellow);
  text-decoration: underline;
}

.nav__actions {
  display: flex;
  align-items: center;
  gap: 40px;
  flex-shrink: 0;
}
.nav__cta {
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-accent-yellow);
  color: var(--color-text-primary);
  font-size: var(--font-size-md);
  font-weight: var(--font-weight-medium);
  padding: 0 20px;
  height: 44px;
  min-width: 44px;
  border-radius: var(--radius-nav-btn);
  white-space: nowrap;
  transition: filter 0.2s ease;
}
.nav__cta:hover {
  filter: brightness(0.92);
}
.nav__text-link {
  font-size: var(--font-size-md);
  color: var(--color-text-white);
  min-height: 44px;
  display: flex;
  align-items: center;
  white-space: nowrap;
  transition: color 0.2s ease;
}
.nav__text-link:hover {
  color: var(--color-accent-yellow);
}
.nav__lang {
  text-transform: uppercase;
}

.nav__hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 10px;
  min-height: 44px;
  min-width: 44px;
  justify-content: center;
  align-items: center;
  margin-left: auto;
}
.nav__hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-text-white);
  border-radius: 2px;
  transition: transform 0.25s ease, opacity 0.25s ease;
}
.nav__hamburger[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.nav__hamburger[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}
.nav__hamburger[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

.nav__drawer {
  display: none;
  position: absolute;
  top: var(--nav-height);
  left: 0;
  right: 0;
  background: var(--color-nav-bg);
  padding: var(--space-md) var(--container-padding-mobile);
  border-top: 1px solid rgba(255,255,255,0.1);
}
.nav__drawer.is-open {
  display: block;
}
.nav__drawer-links {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}
.nav__drawer-links .nav__link {
  padding: var(--space-sm) 0;
  border-bottom: 1px solid rgba(255,255,255,0.08);
}
.nav__cta--mobile {
  margin-top: var(--space-md);
  width: 100%;
  justify-content: center;
  border-radius: var(--radius-nav-btn);
}

@media (max-width: 1024px) {
  .nav__links { gap: 24px; }
  .nav__actions { gap: 20px; }
}

@media (max-width: 768px) {
  .nav__links,
  .nav__actions { display: none; }
  .nav__hamburger { display: flex; }
  .nav__inner { gap: 0; }
}

/* ════════════════════════════════════════════
   SECTION 2 — HERO
════════════════════════════════════════════ */
.hero {
  width: 100%;
  background-image: url('../images/hero-bg.png');
  background-size: cover;
  background-position: center;
  padding: var(--section-padding-y) 0;
  position: relative;
}

.hero__inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-xl);
}

.hero__content {
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-md);
  width: 100%;
}

.hero__pill {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--color-accent-yellow);
  color: var(--color-text-primary);
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  line-height: var(--line-height-tight);
  padding: 12px 24px;
  border-radius: var(--radius-pill);
}
/* 右上角问号图标 */
.hero__pill-icon {
  position: absolute;
  top: -10px;
  right: -10px;
  width: 28px;
  height: 28px;
  display: block;
  pointer-events: none;
}

.hero__title {
  font-size: var(--font-size-h1);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-primary);
  line-height: var(--line-height-tight);
  width: 100%;
  text-align: center;
}

.hero__desc {
  font-size: var(--font-size-md);
  color: var(--color-text-secondary);
  max-width: 65ch;
  line-height: var(--line-height-loose);
  text-align: center;
}

/* ── Hero two-column state ── */
.hero__form-wrap {
  width: 100%;
  display: flex;
  gap: 20px;
  align-items: flex-start;
  justify-content: center;
  transition: all 0.4s ease;
}
.hero__form-wrap.has-results {
  justify-content: flex-start;
}

.hero__form-card {
  background: var(--color-text-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  padding: 40px;
  width: 680px;
  max-width: 100%;
  flex-shrink: 0;
  transition: width 0.4s ease;
}
.hero__form-wrap.has-results .hero__form-card {
  width: 520px;
}

.form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-bottom: 40px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.form-label {
  font-size: var(--font-size-md);
  font-weight: var(--font-weight-bold);
  color: var(--color-primary);
  display: flex;
  align-items: center;
  gap: 4px;
}

.form-input {
  width: 100%;
  height: 44px;
  background: var(--color-text-white);
  border: 2px solid var(--color-primary);
  border-radius: var(--radius-md);
  padding: 2px 12px;
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-primary);
  font-family: var(--font-family-base);
  outline: none;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
  -moz-appearance: textfield;
}
.form-input::-webkit-outer-spin-button,
.form-input::-webkit-inner-spin-button { -webkit-appearance: none; }
.form-input:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(7,106,255,0.15);
}

.form-input-prefix {
  display: flex;
  align-items: center;
  position: relative;
}
.form-prefix {
  position: absolute;
  left: 12px;
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-primary);
  pointer-events: none;
  z-index: 1;
}
.form-input--prefixed {
  padding-left: 24px;
}

.form-actions {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

/* ── Tooltip ── */
.tooltip-wrap {
  position: relative;
  display: inline-flex;
  align-items: center;
}
.tooltip-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 18px;
  height: 18px;
  cursor: help;
  flex-shrink: 0;
}
.tooltip-icon img { display: block; }
.tooltip-bubble {
  position: absolute;
  bottom: calc(100% + 8px);
  left: 50%;
  transform: translateX(-50%);
  background: var(--color-tooltip-bg);
  color: var(--color-text-white);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-regular);
  line-height: 22px;
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.15s ease;
  box-shadow: var(--shadow-tooltip);
  z-index: 10;
}
.tooltip-bubble::after {
  content: '';
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%);
  border: 5px solid transparent;
  border-top-color: var(--color-tooltip-bg);
}
.tooltip-wrap:hover .tooltip-bubble,
.tooltip-wrap:focus-within .tooltip-bubble {
  opacity: 1;
}

/* ── Result panel ── */
.hero__result {
  flex: 1;
  border: 1px solid var(--color-result-container-border);
  border-radius: var(--radius-lg);
  padding: 20px;
  background: linear-gradient(145.97deg, rgba(7,136,255,0.08) 0%, rgba(255,216,66,0.08) 100%), #fff;
  display: flex;
  flex-direction: column;
  gap: 12px;
  opacity: 0;
  transform: translateX(20px);
  transition: opacity 0.3s ease, transform 0.3s ease;
  min-height: 300px;
}
.hero__result.is-visible {
  opacity: 1;
  transform: translateX(0);
  height: stretch;
}

.result-main-card {
  background: var(--color-primary);
  border-radius: var(--radius-btn);
  padding: 16px 20px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  width: 218px;
  flex-shrink: 0;
  align-self: flex-start;
  justify-content: space-between;
  height: stretch;
}
.result-main-label {
  font-size: var(--font-size-md);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-white);
}
.result-main-amount {
  font-size: var(--font-size-result-number);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-white);
  line-height: 1;
}
.result-sub-row {
  display: flex;
  gap: 10px;
}
.result-sub-value {
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-white);
}
.result-sub-label {
  font-size: var(--font-size-xs);
  color: rgba(255,255,255,0.8);
  line-height: 1.2;
  margin-top: 4px;
}

.result-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  grid-template-rows: 1fr 1fr;
  gap: 12px;
  flex: 1;
}
.result-cell {
  background: var(--color-result-mini-bg);
  border: 1px solid var(--color-result-mini-border);
  border-radius: var(--radius-btn);
  padding: 20px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 8px;
}
.result-cell-label {
  font-size: var(--font-size-md);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-primary);
  line-height: 1.375;
}
.result-cell-value {
  font-size: var(--font-size-kpi-number);
  font-weight: var(--font-weight-bold);
  color: var(--color-primary);
  line-height: 1;
  display: flex;
  align-items: baseline;
  gap: 4px;
}
.result-cell-unit {
  font-size: var(--font-size-md);
  font-weight: var(--font-weight-medium);
}
.result-cell-dollar {
  font-size: var(--font-size-xl);
}

/* hero two-column layout activated */
.hero__form-wrap.has-results {
  flex-direction: row;
}
.hero__result {
  display: none;
}
.hero__form-wrap.has-results .hero__result {
  display: flex;
  flex-direction: row;
  gap: 12px;
}

@media (max-width: 1024px) {
  .hero__form-card { width: 100%; }
  .hero__form-wrap.has-results { flex-direction: column; }
  .hero__form-wrap.has-results .hero__form-card { width: 100%; }
  .hero__form-wrap.has-results .hero__result { flex-direction: column; }
}

@media (max-width: 768px) {
  .form-grid { grid-template-columns: 1fr; }
  .hero__form-card { padding: 24px 20px; }
  .result-grid { grid-template-columns: 1fr; }
}

/* ════════════════════════════════════════════
   SECTION 3 — DARK STATS BAR
════════════════════════════════════════════ */
.stats-bar {
  width: 100%;
  background: var(--color-bg-dark-section);
  padding: 80px 0;
}

.stats-bar .container {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

/* KPI 大卡片外壳 */
.kpi-card {
  background: rgba(255,255,255,0.96);
  border-radius: var(--radius-lg);
  box-shadow: 0px 24px 58px rgba(15,23,42,0.18);
  padding: 20px;
}

/* 4 个 KPI 横向等宽 */
.kpi-grid {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.kpi-item {
  flex: 1 0 0;
  min-width: 0;
  background: var(--color-stat-card-bg);
  border: 1px solid var(--color-stat-card-border);
  border-radius: var(--radius-btn);
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.kpi-label {
  font-size: 12px;
  font-weight: var(--font-weight-regular);
  color: var(--color-text-secondary);
  line-height: 18px;
}

.kpi-value-row {
  display: flex;
  align-items: baseline;
  gap: 8px;
  flex-wrap: wrap;
}

.kpi-num {
  font-size: 32px;
  font-weight: var(--font-weight-bold);
  line-height: 40px;
  color: var(--color-text-primary);
}
.kpi-num--blue { color: var(--color-primary); }

.kpi-unit {
  font-size: 18px;
  font-weight: var(--font-weight-bold);
  color: var(--color-text-primary);
  line-height: 24px;
}

.kpi-prefix {
  font-size: 18px;
  font-weight: var(--font-weight-bold);
  color: var(--color-text-primary);
  line-height: 24px;
}

.kpi-dash {
  font-size: 32px;
  font-weight: var(--font-weight-bold);
  color: var(--color-primary);
}

/* 4 个 summary 卡片 2×2 */
.kpi-summary {
  display: flex;
  gap: 20px;
}

.kpi-summary__col {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 17px;
}

.kpi-check-card {
  background: var(--color-text-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 16px;
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: var(--font-size-md);
  color: var(--color-text-primary);
  line-height: 22px;
}
.kpi-check-card img { flex-shrink: 0; }

@media (max-width: 768px) {
  .kpi-grid { flex-direction: column; }
  .kpi-summary { flex-direction: column; }
}
@media (max-width: 480px) {
  .stats-bar { padding: 48px 0; }
}

/* ════════════════════════════════════════════
   SECTION 4 — BENCHMARKS
════════════════════════════════════════════ */
.benchmarks {
  width: 100%;
  background: #F8F9FE;
  padding: var(--section-padding-y) 0;
}
/* S4 section-header 居左 */
.benchmarks .section-header {
  text-align: left;
}
.benchmarks .section-desc {
  margin: 0;
}

/* Segment selector grid */
.segment-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 12px;
  margin-bottom: var(--space-md);
}

.segment-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  padding: 24px 8px;
  background: var(--color-text-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  cursor: pointer;
  min-height: 145px;
  box-shadow: 0 10px 28px 0 rgba(15, 23, 42, 0.10);
  transition: background 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}
.segment-btn img {
  width: 60px;
  height: 60px;
  object-fit: contain;
}
.segment-btn span {
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-primary);
  text-align: center;
  line-height: 1.43;
}
.segment-btn.active {
  background: var(--color-benchmark-active);
  border-color: rgba(7,136,255,0.42);
  box-shadow: 0px 14px 16px rgba(7,136,255,0.12);
}
.segment-btn.active span {
  color: var(--color-text-white);
}
.segment-btn:hover:not(.active) {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-card);
}

.benchmarks__remark {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  margin-bottom: var(--space-md);
  line-height: 1.5;
}
.benchmarks__footnote {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  margin-top: var(--space-md);
  white-space: nowrap;
}

/* ── Segment panel ── */
.segment-panel {
  display: flex;
  flex-direction: column;
  gap: 16px;
  transition: opacity 0.2s ease;
}
.segment-panel.switching {
  opacity: 0;
}

/* ROI factors card */
.roi-factors-card {
  background: var(--color-text-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  padding: 24px 23px;
}
.roi-factors-row {
  display: flex;
  gap: 16px;
}
.roi-factor-item {
  flex: 1;
  background: var(--color-panel-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-btn);
  padding: 12px 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.roi-factor-label {
  font-size: var(--font-size-md);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-secondary);
}
.roi-factor-value {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-black);
  color: var(--color-primary);
}

/* Benchmark tables */
.benchmark-tables {
  display: flex;
  gap: 16px;
}
.benchmark-table-card {
  flex: 1;
  background: var(--color-text-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  padding: 24px 23px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

/* Waste items */
.waste-items {
  display: flex;
  gap: 12px;
}
.waste-item {
  flex: 1;
  padding: 16px;
  border-radius: var(--radius-btn);
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.waste-item--orange {
  background: var(--color-waste-bg);
  border: 1px solid var(--color-waste-border);
}
.waste-item__info strong {
  display: block;
  font-size: var(--font-size-md);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-primary);
  margin-bottom: 2px;
}
.waste-item__info span {
  font-size: var(--font-size-xs);
  color: var(--color-text-secondary);
}
.waste-item__amount {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-black);
  color: var(--color-accent-orange);
}
.waste-total {
  background: var(--color-total-waste-bg);
  border: 1px solid var(--color-total-waste-border);
  border-radius: var(--radius-btn);
  padding: 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.waste-total span:first-child {
  font-size: var(--font-size-h3);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
}
.waste-total__amount {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-black);
  color: var(--color-waste-red) !important;
}

/* Savings items */
.savings-items {
  display: flex;
  gap: 12px;
}
.savings-item {
  flex: 1;
  background: var(--color-savings-bg);
  border: 1px solid var(--color-savings-border);
  border-radius: var(--radius-btn);
  padding: 16px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  min-height: 158px;
  gap: 8px;
}
.savings-item strong {
  font-size: var(--font-size-md);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-primary);
}
.savings-item__amount {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-black);
  color: var(--color-savings-green);
}
.savings-total {
  background: var(--color-savings-highlight);
  border-radius: var(--radius-btn);
  padding: 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  color: var(--color-text-white);
}
.savings-total span:first-child {
  font-size: var(--font-size-h3);
  font-weight: var(--font-weight-semibold);
}
.savings-total span:last-child {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-black);
}
.savings-footer {
  font-size: var(--font-size-base);
  color: var(--color-text-secondary);
}
.savings-footer__sep {
  color: #ccc;
}

/* Chart + Before/After row */
.benchmark-bottom {
  display: flex;
  gap: 16px;
  align-items: stretch;
}
.chart-card {
  background: var(--color-text-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  padding: 24px 16px 16px 16px;
  width: 480px;
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.chart-canvas-wrap {
  position: relative;
  height: 260px;
  width: 100%;
}
#savings-chart {
  position: absolute;
  inset: 0;
  width: 100% !important;
  height: 100% !important;
}
.before-after-card {
  flex: 1;
  background: var(--color-text-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.before-after-desc {
  font-size: var(--font-size-base);
  color: var(--color-text-secondary);
  line-height: 1.43;
}
.before-after-table {
  display: flex;
  gap: 12px;
  flex: 1;
}
.ba-col {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.ba-col--indicators { flex: 0 0 auto; min-width: 140px; }
.ba-col--before, .ba-col--after { flex: 1; }
.ba-header {
  font-size: var(--font-size-md);
  font-weight: var(--font-weight-black);
  color: var(--color-text-secondary);
  padding: 0 16px;
}
.ba-col--before {
  background: var(--color-total-waste-bg);
  border: 1px solid var(--color-total-waste-border);
  border-radius: var(--radius-btn);
  padding: 16px;
  color: var(--color-text-primary);
}
.ba-col--after {
  background: var(--color-savings-bg);
  border: 1px solid var(--color-savings-border);
  border-radius: var(--radius-btn);
  padding: 16px;
}
.ba-col--before .ba-header { color: var(--color-text-primary); }
.ba-col--after .ba-header { color: var(--color-text-primary); }
.ba-row {
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-regular);
  color: var(--color-text-secondary);
  line-height: 1.43;
  display: flex;
  justify-content: space-between;
  gap: 8px;
}
.ba-col--before .ba-row, .ba-col--after .ba-row {
  color: var(--color-text-primary);
  font-weight: var(--font-weight-regular);
}
.ba-delta {
  color: var(--color-savings-green);
  font-weight: var(--font-weight-bold);
  flex-shrink: 0;
}
.ba-col--indicators .ba-header { padding: 0; }
.ba-col--indicators .ba-row { padding: 0; font-weight: var(--font-weight-medium); }

@media (max-width: 1024px) {
  .segment-grid { grid-template-columns: repeat(5, 1fr); gap: 8px; }
  .benchmark-tables { flex-direction: column; }
  .waste-items { flex-direction: column; }
  .savings-items { flex-direction: column; }
  .benchmark-bottom { flex-direction: column; }
  .chart-card { width: 100%; }
}
@media (max-width: 768px) {
  .segment-grid { grid-template-columns: repeat(3, 1fr); }
  .roi-factors-row { flex-direction: column; }
  .before-after-table { flex-direction: column; }
}
@media (max-width: 480px) {
  .segment-grid { grid-template-columns: repeat(2, 1fr); }
}

/* ════════════════════════════════════════════
   SECTION 6 — CASE STUDIES
════════════════════════════════════════════ */
.case-studies {
  width: 100%;
  background: var(--color-text-white);
  padding: var(--section-padding-y) 0;
}

.case-studies__header {
  margin-bottom: 26px;
}
.case-studies__title-group {
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.case-studies__title-row {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 20px;
}
.case-studies__nav {
  display: flex;
  gap: 12px;
  align-items: center;
  flex-shrink: 0;
}

.carousel-btn {
  background: var(--color-text-primary);
  border-radius: var(--radius-btn);
  padding: 10px;
  min-width: 52px;
  min-height: 52px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: filter 0.2s ease;
}
.carousel-btn img { display: block; pointer-events: none; }
.carousel-btn:hover {
  filter: brightness(1.3);
}
.carousel-btn:disabled {
  opacity: 0.3;
  cursor: not-allowed;
}

.carousel-wrapper {
  overflow: hidden;
  padding: 40px;   /* ≥ shadow blur(28px) + offset(10px) */
  margin: -40px;
}
.carousel-track {
  display: flex;
  gap: var(--card-case-study-gap);
  transition: transform 0.35s ease;
  will-change: transform;
}

/* Case card */
.case-card {
  background: var(--color-text-white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-case-card);
  width: var(--card-case-study-width);
  min-width: var(--card-case-study-width);
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  height: 448px;
  position: relative;
  overflow: hidden;            /* 裁内容，不裁 box-shadow */
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}
.case-card:hover {
  transform: translateY(-4px);
  box-shadow: 0px 18px 40px rgba(15,23,42,0.16);
}

.case-card__header {
  height: 180px;
  position: relative;
  overflow: hidden;
  flex-shrink: 0;
}
.case-card__logo-area {
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 55%;
  background: var(--color-text-white);
  display: flex;
  align-items: center;
  padding-left: 40px;
  z-index: 2;
}
.case-card__logo-area img {
  max-width: 160px;
  max-height: 55px;
  object-fit: contain;
}
.case-card__logo-area--empty {
  align-items: center;
}
.case-card__logo-text {
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-secondary);
}
/* gradient fade from logo to photo */
.case-card__logo-area::after {
  content: '';
  position: absolute;
  top: 0; right: -60px; bottom: 0;
  width: 60px;
  background: linear-gradient(to right, #fff 0%, rgba(255,255,255,0) 100%);
  pointer-events: none;
}
.case-card__photo {
  position: absolute;
  right: 0;
  top: 0;
  width: 260px;
  height: 100%;
}
.case-card__photo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.case-card__tags {
  position: absolute;
  top: 140px; /* 180px header - ~40px tag height = 140px from card top */
  left: 20px;
  display: flex;
  align-items: center;
  gap: 16px;
  background: var(--color-icon-bg-blue);
  border-radius: var(--radius-btn);
  padding: 10px 16px;
  z-index: 4;
}
.case-tag {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-primary);
  white-space: nowrap;
}
.case-tag svg { flex-shrink: 0; }
.case-tag-sep {
  width: 1px;
  height: 20px;
  background: rgba(0,0,0,0.15);
  flex-shrink: 0;
}

.case-card__metrics {
  display: flex;
  gap: 12px;
  align-items: center;
  padding: 20px 20px 0;
  flex-shrink: 0;
}
.case-metric {
  display: flex;
  align-items: center;
  gap: 12px;
  flex: 1;
  min-width: 0;
}
.case-metric__icon {
  background: var(--color-icon-bg-blue);
  border-radius: var(--radius-btn);
  padding: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.case-metric__val {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-primary);
  line-height: 1.3;
}
.case-metric__sub {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  line-height: 1.23;
}

.case-card__body {
  padding: 0 20px 20px;
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 6px;
  overflow: hidden;
}
.case-card__body p {
  font-size: var(--font-size-base);
  color: var(--color-text-secondary);
  line-height: 1.43;
}
.case-card__body strong {
  color: var(--color-text-primary);
}

/* Carousel dots */
.carousel-dots {
  display: flex;
  gap: 8px;
  justify-content: center;
  margin-top: 20px;
}
.carousel-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-border);
  border: none;
  cursor: pointer;
  padding: 0;
  min-width: unset;
  min-height: unset;
  transition: background 0.2s ease, transform 0.2s ease;
}
.carousel-dot.active {
  background: var(--color-primary);
  transform: scale(1.25);
}

@media (max-width: 1440px) {
  /* show 3 full + partial 4th handled by JS */
}
@media (max-width: 768px) {
  .case-studies__header { flex-direction: column; align-items: flex-start; gap: 16px; }
}

/* ════════════════════════════════════════════
   SECTION 7 — COMPARE
════════════════════════════════════════════ */
.compare {
  width: 100%;
  background: #F8F9FE;
  padding: var(--section-padding-y) 0;
}

.compare-stage {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: flex-end;
  height: 514px;
  margin-bottom: 20px;
}

.compare-card {
  width: 600px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  gap: 20px;
  padding: 0 40px 40px;
  position: relative;
  overflow: visible;
}
.compare-card--paper {
  height: 400px;
  background: linear-gradient(to bottom, #e8eef5, #fff);
  margin-right: -10px;
  z-index: 1;
}
.compare-card--esl {
  height: 440px;
  background: linear-gradient(to bottom, #cce4ff, #fff);
  margin-left: -10px;
  z-index: 2;
}

.compare-card__image {
  position: absolute;
  top: -72px;
  left: 50%;
  transform: translateX(-50%);
  width: 200px;
  height: 200px;
}
.compare-card__image img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  border-radius: var(--radius-btn);
}
/* ESL side larger image */
.compare-card--esl .compare-card__image {
  top: -107px;
  width: 357px;
  height: 207px;
}

.compare-card__title {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-bold);
  line-height: 1.33;
}
.compare-card__title--paper { color: var(--color-text-secondary); }
.compare-card__title--esl  { color: var(--color-text-primary); }

/* VS badge */
.compare-vs {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background: var(--color-text-white);
  border-radius: var(--radius-circle);
  padding: 6px;
  box-shadow: 0px 0px 6px rgba(0,0,0,0.12);
  z-index: 10;
}
.compare-vs__circle {
  width: 80px;
  height: 80px;
  background: var(--color-primary);
  border-radius: var(--radius-circle);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 40px;
  font-weight: var(--font-weight-black);
  color: var(--color-text-white);
  line-height: 1.2;
}

.compare-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.compare-list__item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: var(--font-size-md);
  line-height: 1.55;
}
.compare-list__item--bad  { color: var(--color-text-secondary); }
.compare-list__item--good { color: var(--color-text-primary); }

/* bottom bar */
.compare-bottom {
  background: var(--color-text-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 17px 21px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 40px;
}
.compare-bottom__text {
  font-size: var(--font-size-md);
  color: var(--color-text-secondary);
  max-width: 65ch;
  line-height: 1.5;
}
.compare-bottom .btn {
  flex-shrink: 0;
  padding: 12px 20px;
  font-size: var(--font-size-md);
  border-radius: var(--radius-md);
}

@media (max-width: 1024px) {
  .compare-stage {
    flex-direction: column;
    align-items: center;
    height: auto;
    gap: 16px;
    padding-top: 80px;
  }
  .compare-card {
    width: 100%;
    height: auto;
    margin: 0;
    padding: 24px 24px 32px;
  }
  .compare-card__image { top: -50px; }
  .compare-vs {
    position: static;
    transform: none;
    display: flex;
    justify-content: center;
  }
  .compare-bottom { flex-direction: column; align-items: flex-start; }
}

/* ════════════════════════════════════════════
   SECTION 8+9 — CTA + FORM
════════════════════════════════════════════ */
.cta-section {
  width: 100%;
  background: linear-gradient(137.53deg, rgb(5,6,8) 0%, rgb(13,23,40) 100%);
  background-image:
    url("data:image/svg+xml,%3Csvg viewBox='0 0 1440 1318' xmlns='http://www.w3.org/2000/svg'%3E%3Cdefs%3E%3CradialGradient id='g' gradientUnits='userSpaceOnUse' cx='144' cy='237' r='220' %3E%3Cstop stop-color='rgba(7,136,255,0.36)' offset='0'/%3E%3Cstop stop-color='rgba(0,0,0,0)' offset='1'/%3E%3C/radialGradient%3E%3C/defs%3E%3Crect fill='url(%23g)' width='100%25' height='100%25'/%3E%3C/svg%3E"),
    linear-gradient(137.53deg, rgb(5,6,8) 0%, rgb(13,23,40) 100%);
  padding: var(--section-padding-y) 0;
  display: flex;
  flex-direction: column;
  gap: 28px;
}

.cta-tag {
  display: inline-block;
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-bold);
  color: var(--color-accent-yellow);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0;
}

.cta-title {
  font-size: var(--font-size-h2);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-white);
  line-height: var(--line-height-tight);
  max-width: 800px;
  margin-bottom: 0;
}

.cta-panels {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}
.cta-panel {
  background: var(--color-cta-panel-bg);
  border-radius: var(--radius-lg);
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  min-height: 330px;
}
.cta-panel__title {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-white);
  line-height: 1.3;
}
.cta-panel__desc {
  font-size: var(--font-size-base);
  color: rgba(255,255,255,0.7);
  line-height: 1.43;
}
.cta-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.cta-list li {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: var(--font-size-md);
  color: rgba(255,255,255,0.9);
  line-height: 1.55;
}
.cta-check {
  flex-shrink: 0;
  display: block;
  width: 16px;
  height: 16px;
}
.cta-panel__footer {
  font-size: var(--font-size-base);
  color: rgba(255,255,255,0.7);
  line-height: 1.43;
  margin-top: auto;
}

/* Contact form card */
.contact-form-card {
  background: var(--color-text-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  padding: 24px;
}
.contact-form-card__title {
  font-size: var(--font-size-h3);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  margin-bottom: 24px;
}

.contact-form__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px 10px;
  margin-bottom: 10px;
}
.contact-field {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.contact-field--full {
  grid-column: 1 / -1;
}
.contact-label {
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-primary);
  line-height: 1.43;
}
.contact-input {
  width: 100%;
  height: 42px;
  background: var(--color-text-white);
  border: 1px solid var(--color-border-dark);
  border-radius: var(--radius-md);
  padding: 0 12px;
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-regular);
  color: var(--color-text-primary);
  font-family: var(--font-family-base);
  outline: none;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}
.contact-input::placeholder {
  color: #bebebe;
}
.contact-input:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(7,106,255,0.12);
}
.contact-input--select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='22' height='22' viewBox='0 0 24 24' fill='none'%3E%3Cpath d='M6 9l6 6 6-6' stroke='%23667085' stroke-width='2' stroke-linecap='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  padding-right: 40px;
  cursor: pointer;
}
.contact-input--textarea {
  height: auto;
  padding: 12px;
  resize: vertical;
  min-height: 110px;
}

.btn--submit {
  margin-top: var(--space-md);
  font-size: var(--font-size-md);
  width: 560px;
  max-width: 100%;
  display: block;
  margin-left: auto;
  margin-right: auto;
}

@media (max-width: 768px) {
  .cta-panels { grid-template-columns: 1fr; }
  .contact-form__grid { grid-template-columns: 1fr; gap: 10px; }
  .contact-field--full { grid-column: 1; }
}

/* ════════════════════════════════════════════
   SECTION 10 — FAQ + REFERENCES
════════════════════════════════════════════ */
.faq-section {
  width: 100%;
  background: var(--color-benchmark-bg);
  padding: var(--section-padding-y) 0;
}

.faq-layout {
  display: flex;
  gap: 20px;
  align-items: stretch; /* 两列等高 */
}
.faq-main {
  flex: 1;
  display: flex;
  flex-direction: column;
}
.faq-references {
  flex-shrink: 0;
  width: 260px;
  display: flex;
  flex-direction: column;
}

.faq-card, .faq-references__card {
  background: var(--color-text-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  padding: 24px;
  flex: 1; /* fill height */
}
.faq-card__title {
  font-size: var(--font-size-h3);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  margin-bottom: 20px;
}

.faq-list {
  display: flex;
  flex-direction: column;
}
.faq-item {
  border-bottom: 1px solid var(--color-border);
}
.faq-item:last-child { border-bottom: none; }

.faq-item__question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 0;
  cursor: pointer;
  list-style: none;
  font-size: var(--font-size-md);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-primary); /* 始终深色，不变蓝 */
  line-height: 1.375;
  gap: 12px;
  min-height: 44px;
}
.faq-item__question::-webkit-details-marker { display: none; }

/* 展开状态：问题文字仍保持深色 */
details[open] > .faq-item__question {
  color: var(--color-text-primary);
}

/* FAQ 双图标切换：regular(收起) / active(展开) */
.faq-icon {
  flex-shrink: 0;
  display: block;
  width: 24px;
  height: 24px;
}
/* 默认：regular 可见，active 隐藏 */
.faq-icon--regular { display: block; }
.faq-icon--active  { display: none;  }

/* 展开：regular 隐藏，active 可见 */
details[open] .faq-icon--regular { display: none;  }
details[open] .faq-icon--active  { display: block; }

.faq-item__answer {
  overflow: hidden;
  padding-bottom: 12px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.faq-item__answer p {
  font-size: var(--font-size-base);
  color: var(--color-text-secondary);
  line-height: 1.43;
  max-width: 65ch;
}
.faq-read-more {
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  color: var(--color-primary);
  transition: text-decoration 0.15s;
}
.faq-read-more:hover { text-decoration: underline; }

/* References */
.faq-references__title {
  font-size: var(--font-size-h3);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  margin-bottom: 20px;
}
.faq-references__list {
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.faq-references__list li {
  font-size: var(--font-size-base);
  color: var(--color-text-secondary);
  line-height: 1.57;
}

@media (max-width: 768px) {
  .faq-layout { flex-direction: column; }
  .faq-references { width: 100%; }
}

/* ════════════════════════════════════════════
   SECTION 11 — FOOTER
════════════════════════════════════════════ */
.footer {
  width: 100%;
  background: var(--color-footer-bg);
  padding-top: 60px;
}

.footer__inner {
  display: grid;
  grid-template-columns: repeat(4, auto);
  justify-content: space-between;
  gap: 40px;
  padding-bottom: 40px;
}

.footer__heading {
  font-size: var(--font-size-md);
  font-weight: var(--font-weight-regular);
  color: var(--color-text-white);
  line-height: 1.875;
  margin-bottom: 16px;
}
.footer__list {
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.footer__link {
  font-size: var(--font-size-xs);
  color: rgba(255,255,255,0.7);
  line-height: 1.75;
  min-height: 28px;
  display: flex;
  align-items: center;
  transition: color 0.2s ease;
}
.footer__link:hover {
  color: var(--color-text-white);
  text-decoration: underline;
}

.footer__bottom {
  border-top: 1px solid var(--color-footer-divider);
  height: 61px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.footer__bottom-inner {
  display: flex;
  gap: 40px;
  align-items: center;
  font-size: var(--font-size-base);
  color: rgba(255,255,255,0.7);
  flex-wrap: wrap;
  justify-content: center;
}
.footer__bottom-link {
  color: rgba(255,255,255,0.7);
  transition: color 0.2s ease;
}
.footer__bottom-link:hover {
  color: var(--color-text-white);
}

@media (max-width: 768px) {
  .footer__inner {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }
  padding-bottom: env(safe-area-inset-bottom, 0px);
}
@media (max-width: 480px) {
  .footer__inner { grid-template-columns: 1fr; }
}

/* ════════════════════════════════════════════
   REDUCED MOTION
════════════════════════════════════════════ */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    transition: none !important;
    animation: none !important;
  }
}