/**
 * FDE × Sierra LIGHT theme
 * Reference: https://sierra.ai/ — bright canvas, black type, dark primary CTA,
 * generous whitespace, product stage under the claim.
 * Load LAST. Remaps --gold* to accent for legacy selectors.
 */
:root {
  --bg: #f7f7f5;
  --bg-2: #ffffff;
  --panel: #ffffff;
  --panel-2: #f0f0ec;
  --line: rgba(10, 10, 10, 0.08);
  --line-strong: rgba(10, 10, 10, 0.14);
  --ink: #0a0a0a;
  --ink-soft: #4a4a4a;
  --ink-dim: #7a7a7a;
  --accent: #5b4fe8;
  --accent-soft: #6e63f0;
  --accent-glow: rgba(91, 79, 232, 0.12);
  --mist: rgba(91, 79, 232, 0.08);
  --mist-2: rgba(255, 140, 100, 0.07);
  --cyan: #5b4fe8;
  --gold: #5b4fe8;
  --gold-soft: #6e63f0;
  --cta-bg: #0a0a0a;
  --cta-ink: #ffffff;
  --maxw: 1120px;
  --radius-btn: 999px;
  --radius-card: 20px;
  --font-display: "Plus Jakarta Sans", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "Noto Sans SC", "Plus Jakarta Sans", "PingFang SC", "Microsoft YaHei", sans-serif;
  --section-y: clamp(96px, 12vw, 140px);
}

html {
  color-scheme: light;
}

body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-body);
  font-weight: 400;
}

body::before {
  background:
    radial-gradient(900px 520px at 80% -10%, var(--mist), transparent 55%),
    radial-gradient(700px 480px at 0% 20%, var(--mist-2), transparent 50%),
    linear-gradient(180deg, #ffffff 0%, #f7f7f5 42%, #f7f7f5 100%);
}

/* Kill dark cyber grid on light */
body::after {
  opacity: 0.22;
  background-image:
    linear-gradient(rgba(10, 10, 10, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(10, 10, 10, 0.035) 1px, transparent 1px);
  mask-image: radial-gradient(ellipse 70% 45% at 50% 0%, #000 5%, transparent 70%);
  -webkit-mask-image: radial-gradient(ellipse 70% 45% at 50% 0%, #000 5%, transparent 70%);
}

.ambient-orb.a {
  background: rgba(91, 79, 232, 0.18) !important;
  opacity: 0.55;
  filter: blur(80px);
}
.ambient-orb.b {
  background: rgba(255, 150, 110, 0.14) !important;
  opacity: 0.45;
  filter: blur(80px);
}

/* —— Type —— */
.brand-name,
.sec-title,
.hero h1,
.cta-band h2,
.cta-band h3,
.drawer-title {
  font-family: var(--font-display);
  font-weight: 600;
  letter-spacing: -0.035em;
  color: var(--ink);
}

.brand-sub {
  color: var(--ink-dim);
}

.sec-title {
  font-size: clamp(34px, 4.6vw, 52px);
  line-height: 1.12;
  max-width: 16em;
}

.sec-desc {
  color: var(--ink-soft);
  font-size: 18px;
  line-height: 1.65;
  max-width: 38rem;
}

.kicker {
  font-family: var(--font-display);
  font-weight: 500;
  letter-spacing: 0.12em;
  color: var(--accent);
  text-transform: uppercase;
  font-size: 12px;
}

.kicker::before {
  background: var(--accent);
}

.more-link {
  color: var(--ink);
  font-weight: 600;
  border-bottom: 1px solid rgba(10, 10, 10, 0.2);
  padding-bottom: 2px;
}
.more-link:hover {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

/* —— Nav (Sierra light) —— */
.nav {
  background: rgba(255, 255, 255, 0.82);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(16px) saturate(1.1);
}

.nav-links > a:not(.btn) {
  color: var(--ink-soft);
  font-weight: 500;
}
.nav-links > a:not(.btn):hover,
.nav-links > a:not(.btn).active {
  color: var(--ink);
}

.nav-toggle {
  border-color: var(--line-strong);
  color: var(--ink);
}

/* —— Buttons: dark primary on light (Sierra) —— */
.btn {
  border-radius: var(--radius-btn);
  padding: 14px 26px;
  font-family: var(--font-display);
  font-weight: 600;
}

a.btn-gold,
button.btn-gold,
.btn-gold {
  background: var(--cta-bg) !important;
  color: var(--cta-ink) !important;
  box-shadow: 0 12px 32px -16px rgba(10, 10, 10, 0.45);
  filter: none;
}

a.btn-gold:hover,
a.btn-gold:focus,
a.btn-gold:visited,
button.btn-gold:hover,
.btn-gold:hover {
  color: var(--cta-ink) !important;
  background: #222 !important;
  filter: none;
  box-shadow: 0 16px 40px -16px rgba(10, 10, 10, 0.5);
}

a.btn-ghost,
button.btn-ghost,
.btn-ghost {
  border: 1px solid rgba(10, 10, 10, 0.16) !important;
  color: var(--ink) !important;
  background: transparent !important;
}

a.btn-ghost:hover,
a.btn-ghost:visited,
button.btn-ghost:hover,
.btn-ghost:hover {
  border-color: rgba(10, 10, 10, 0.4) !important;
  color: var(--ink) !important;
  background: rgba(10, 10, 10, 0.03) !important;
}

.btn:focus-visible {
  outline: 2px solid var(--accent);
}

/* —— Sierra hero: claim first, stage second —— */
.hero {
  background: transparent;
  min-height: auto;
  padding: clamp(72px, 10vw, 120px) 0 clamp(48px, 6vw, 72px);
}

.hero-bg {
  display: none !important;
}

.hero-sierra .hero-center {
  text-align: center;
  max-width: 920px;
  margin: 0 auto 48px;
}

.hero-sierra .eyebrow {
  justify-content: center;
  color: var(--accent);
  font-family: var(--font-display);
  letter-spacing: 0.1em;
}

.hero-sierra .eyebrow .dot {
  background: var(--accent);
}

.hero-sierra h1 {
  font-size: clamp(42px, 7vw, 72px);
  line-height: 1.05;
  letter-spacing: -0.045em;
  margin: 18px auto 20px;
  max-width: 14em;
  color: var(--ink);
}

.hero-sierra h1 .big {
  background: none;
  -webkit-background-clip: unset;
  background-clip: unset;
  color: var(--ink);
}

.hero-sierra .hero-lead {
  margin: 0 auto 12px;
  font-size: clamp(17px, 1.6vw, 20px);
  color: var(--ink-soft);
  max-width: min(42rem, 100%);
}

.hero-sierra .asset-note {
  margin: 0 auto 28px;
  color: #3f3f46;
  font-size: 16px;
  line-height: 1.75;
  font-weight: 400;
  max-width: min(42rem, 100%);
}

.hero-sierra .hero-cta {
  justify-content: center;
  flex-wrap: wrap;
}

.hero-sierra .hero-link {
  display: inline-flex;
  align-items: center;
  margin-left: 8px;
  font-size: 14px;
  font-weight: 500;
  color: var(--ink-soft);
  text-decoration: underline;
  text-underline-offset: 4px;
}
.hero-sierra .hero-link:hover {
  color: var(--ink);
}

.hero-stage {
  margin: 0 auto 40px;
  max-width: 960px;
}

/* Product stage: vertical stack — rhythm on top, case below */
.stage-frame {
  display: flex;
  flex-direction: column;
  gap: 16px;
  padding: 16px;
  border-radius: 28px;
  background: var(--bg-2);
  border: 1px solid var(--line);
  box-shadow:
    0 1px 0 rgba(255, 255, 255, 0.8) inset,
    0 40px 80px -48px rgba(10, 10, 10, 0.28);
}

.stage-frame .cadence,
.stage-frame .hero-proof {
  margin: 0;
  border-radius: 18px;
  border: 1px solid var(--line);
  background: #fff;
  box-shadow: none;
  backdrop-filter: none;
  max-width: none;
  width: 100%;
  overflow: visible;
}

.stage-frame .cadence {
  overflow: visible;
}

.stage-frame .cadence-road {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0;
  padding: 8px 8px 12px;
}

.stage-frame .cadence-row {
  padding: 16px 14px 14px;
  border-bottom: none;
  border-right: 1px solid var(--line);
  min-width: 0;
}

.stage-frame .cadence-row:last-child {
  border-right: none;
}

.stage-frame .cadence-when {
  color: var(--accent) !important;
  font-weight: 600;
  font-size: 12px;
  margin-bottom: 10px;
}

.stage-frame .cadence-value {
  font-size: clamp(18px, 2vw, 24px) !important;
  line-height: 1.35 !important;
  margin-bottom: 8px !important;
  letter-spacing: -0.02em;
  text-wrap: unset;
  word-break: keep-all;
}

.stage-frame .cadence-label {
  font-size: 13px !important;
  line-height: 1.65 !important;
  color: var(--ink-soft) !important;
  text-wrap: pretty;
}

.stage-frame .cadence-label .nowrap {
  white-space: normal;
}

.stage-frame .cadence-track {
  margin-top: 12px;
}

.stage-frame .cadence-note {
  font-size: 13px;
  color: var(--ink-soft) !important;
  line-height: 1.7;
}

.stage-frame .cadence-value.tone-ink,
.stage-frame .cadence-value.tone-navy {
  color: #0a0a0a !important;
}
.stage-frame .cadence-value.tone-soft {
  color: #8a6210 !important;
}
.stage-frame .cadence-value.tone-gold {
  color: #4f46e5 !important;
}
.stage-frame .cadence-value.tone-cyan {
  color: #1d4ed8 !important;
}

.stage-frame .hero-proof {
  display: flex !important;
  flex-direction: column;
  grid-template-columns: none !important;
  height: auto;
}

.stage-frame .hero-proof img {
  width: 100% !important;
  height: 280px !important;
  min-height: 220px !important;
  object-fit: cover;
  border-radius: 18px 18px 0 0;
}

.stage-frame .hero-proof-body {
  flex: 1;
  padding: 22px 24px 24px;
}

.stage-frame .hero-proof-title {
  font-size: 24px;
  line-height: 1.35;
  margin-bottom: 12px;
}

.stage-frame .hero-proof-out {
  font-size: 16px;
  line-height: 1.8;
  color: var(--ink-soft) !important;
  word-break: normal;
  overflow-wrap: break-word;
  text-wrap: pretty;
}

@media (max-width: 800px) {
  .stage-frame .cadence-road {
    grid-template-columns: 1fr 1fr;
  }
  .stage-frame .cadence-row:nth-child(2n) {
    border-right: none;
  }
  .stage-frame .cadence-row:nth-child(-n + 2) {
    border-bottom: 1px solid var(--line);
  }
  .stage-frame .hero-proof img {
    height: 200px !important;
  }
}

@media (max-width: 520px) {
  .stage-frame .cadence-road {
    grid-template-columns: 1fr;
  }
  .stage-frame .cadence-row {
    border-right: none;
    border-bottom: 1px solid var(--line);
  }
  .stage-frame .cadence-row:last-child {
    border-bottom: none;
  }
}

.trust-metrics {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
  max-width: 920px;
  margin: 0 auto;
}

.trust-metrics .trust-item {
  text-align: center;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 18px 12px;
}

.trust-metrics .trust-v {
  color: var(--ink);
  font-size: 22px;
  font-weight: 700;
  font-family: var(--font-display);
}

.trust-metrics .trust-k {
  color: var(--ink-dim);
  font-size: 12px;
}

/* —— Logo / scene wall —— */
.marquee-blk {
  background: #fff;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding: 28px 0;
}

.marquee-blk .marquee-label {
  text-align: center;
  font-size: 13px;
  color: var(--ink-dim);
  margin-bottom: 16px;
  letter-spacing: 0.04em;
}

.marquee-item {
  color: var(--ink-soft);
  font-weight: 500;
}

/* —— Sections —— */
.blk {
  border-top: 1px solid var(--line);
  background: transparent;
}

.blk.alt {
  background: #fff;
}

.sec-head {
  margin-bottom: 48px;
  max-width: 720px;
}

.home .sec-head {
  text-align: center;
  margin-left: auto;
  margin-right: auto;
}

.home .sec-head .sec-title,
.home .sec-head .sec-desc,
.home .sec-head .kicker {
  margin-left: auto;
  margin-right: auto;
  text-align: center;
}

.home .sec-head .kicker {
  justify-content: center;
}

.theater-copy .kicker {
  justify-content: center;
}

.theater-copy .sec-title,
.theater-copy .sec-desc {
  text-align: center;
  margin-left: auto;
  margin-right: auto;
}

/* —— Cards light —— */
.app-card,
.sol-card,
.cap-card,
.case-card,
.stage-card,
.pain,
.point,
.contrast-card,
.fit-col,
.catalog-item,
.week,
.faq-item,
.ba-row,
.step {
  background: #fff !important;
  border: 1px solid var(--line) !important;
  border-radius: var(--radius-card);
  color: var(--ink);
  box-shadow: 0 10px 30px -24px rgba(10, 10, 10, 0.2);
}

.app-card:hover,
.sol-card:hover,
.cap-card:hover,
.case-card:hover,
.stage-card:hover,
.step:hover,
.step.is-active {
  border-color: rgba(91, 79, 232, 0.35) !important;
  box-shadow: 0 18px 40px -28px rgba(91, 79, 232, 0.35);
}

.app-card h3,
.sol-card h3,
.cap-card h3,
.case-title,
.step-t,
.point-t {
  color: var(--ink) !important;
}

.app-card p,
.sol-card p,
.cap-card p,
.step-d,
.outcome-text {
  color: var(--ink-soft) !important;
}

.trust-v,
.metric-v,
.num-after,
.ba-after-n,
.contrast-v,
.step-no,
.stage-no,
.week-no,
.deliv-no,
.cadence-value.tone-gold {
  color: var(--accent) !important;
}

.ba-before-n,
.num-before {
  color: var(--ink-dim) !important;
}

.cadence,
.hero-proof {
  background: #fff;
  border-color: var(--line);
}

.cadence-label,
.cadence-when,
.hero-proof-label,
.case-brand,
.sol-meta,
.app-card-top {
  color: var(--ink-dim) !important;
}

.hero-proof-out,
.outcome-text {
  color: var(--ink-soft) !important;
}

.case-title {
  color: var(--ink) !important;
  line-height: 1.35;
  letter-spacing: -0.02em;
}

.outcome-text {
  line-height: 1.75 !important;
  font-size: 14px;
}

.cat-name {
  color: var(--ink) !important;
  font-weight: 600;
}

.value-card .vd {
  line-height: 1.7;
}

.cadence-track {
  background: rgba(10, 10, 10, 0.06);
}
.cadence-fill.tone-gold {
  background: linear-gradient(90deg, transparent, var(--accent)) !important;
}

/* Value cards — Chinese needs width; 2×2 default, 4-up only on very wide */
.value-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

@media (min-width: 1200px) {
  .value-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.value-card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius-card);
  padding: 28px 22px;
  min-height: 180px;
  min-width: 0;
}

.value-card .vk {
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 14px;
  font-weight: 600;
}

.value-card .vt {
  font-family: var(--font-display);
  font-size: 20px;
  line-height: 1.35;
  letter-spacing: -0.01em;
  margin-bottom: 10px;
  color: var(--ink);
}

.value-card .vd {
  font-size: 14px;
  color: var(--ink-soft);
  line-height: 1.7;
}

/* Theater: copy above, steps full-width below (avoid narrow column wraps) */
.theater {
  padding: var(--section-y) 0;
  background: #fff;
  border-top: 1px solid var(--line);
}

.theater-split {
  display: flex;
  flex-direction: column;
  gap: 36px;
  align-items: stretch;
}

.theater-copy {
  text-align: center;
  max-width: 760px;
  margin: 0 auto;
}

.theater-copy .kicker {
  justify-content: center;
}

.theater-copy .sec-title,
.theater-copy .sec-desc {
  text-align: center;
  margin-left: auto;
  margin-right: auto;
  max-width: none;
}

.theater-copy .more-link {
  display: inline-flex;
  justify-content: center;
}

.theater-panel {
  border-radius: 24px;
  border: 1px solid var(--line);
  background: var(--bg);
  padding: 16px;
  box-shadow: 0 30px 60px -40px rgba(10, 10, 10, 0.25);
}

.theater-panel .steps {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
}

.theater-panel .step {
  min-width: 0;
}

.theater-panel .step-d {
  line-height: 1.7;
}

@media (max-width: 960px) {
  .theater-panel .steps {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 640px) {
  .value-grid,
  .theater-panel .steps {
    grid-template-columns: 1fr;
  }
}

/* CTA band light */
.cta-band {
  background:
    radial-gradient(520px 240px at 90% 0%, var(--accent-glow), transparent 60%),
    #fff !important;
  border: 1px solid var(--line) !important;
  border-radius: 28px;
  color: var(--ink);
}

.cta-band h3,
.cta-band p {
  color: var(--ink);
}
.cta-band p {
  color: var(--ink-soft) !important;
}

.footer {
  color: var(--ink-dim);
  border-top: 1px solid var(--line);
}

.modal .sheet,
.drawer-panel {
  background: #fff !important;
  color: var(--ink);
  border: 1px solid var(--line);
}

.lead-field input,
.lead-field textarea {
  background: #f7f7f5 !important;
  border-color: var(--line) !important;
  color: var(--ink) !important;
}

.lead-field input:focus,
.lead-field textarea:focus {
  border-color: rgba(91, 79, 232, 0.5) !important;
  box-shadow: 0 0 0 3px rgba(91, 79, 232, 0.12);
}

.sheet h3,
.lead-success-title {
  color: var(--ink) !important;
}

.sheet .sub,
.lead-success-desc,
.hint {
  color: var(--ink-soft) !important;
}

@media (max-width: 960px) {
  .trust-metrics {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 640px) {
  .trust-metrics {
    grid-template-columns: 1fr;
  }
  .hero-sierra h1 {
    font-size: clamp(34px, 10vw, 44px);
  }
  .btn {
    border-radius: 14px;
  }
}

/* —— Chinese line-breaking —— */
.nowrap {
  white-space: nowrap;
}

.hero h1,
.sec-title,
.cta-band h3,
.value-card .vt,
.step-t,
.app-card h3,
.sol-card h3,
.cap-card h3,
.case-title,
.hero-proof-title {
  text-wrap: balance;
  line-break: strict;
  overflow-wrap: normal;
  word-break: normal;
  letter-spacing: -0.015em;
}

.hero-lead,
.asset-note,
.sec-desc,
.value-card .vd,
.step-d,
.app-card p,
.sol-card p,
.cap-card p,
.cadence-label,
.hero-proof-out,
.outcome-text {
  text-wrap: pretty;
  line-break: strict;
  word-break: normal;
  overflow-wrap: break-word;
  line-height: 1.75;
}

.sec-title {
  max-width: min(42rem, 100%);
}

.home .sec-head {
  max-width: 820px;
}

.hero-sierra h1 {
  max-width: min(920px, 100%);
  letter-spacing: -0.02em;
}

.hero-sierra .hero-lead,
.hero-sierra .asset-note {
  max-width: min(42rem, 100%);
}

.app-card-top,
.sol-meta {
  color: var(--ink-soft) !important;
  opacity: 1;
  font-size: 12px;
  font-weight: 500;
}