/* =============================================================
   AI Office Showcase — Homepage Styles
   ============================================================= */

/* ---------- Reset & Variables ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg:          #0a0d14;
  --bg-card:     rgba(20, 28, 50, 0.55);
  --border-card: rgba(100, 120, 180, 0.15);
  --text:        #e8ecf4;
  --text-2:      #8b95a8;
  --text-3:      #5a6478;
  --accent-blue:   #3b82f6;
  --accent-purple: #8b5cf6;
  --accent-cyan:   #06b6d4;
  --r:    16px;
  --r-pill: 999px;
  --container: 1200px;
  --section-gap: 120px;
}

html { scroll-behavior: smooth; }

body {
  font-family: -apple-system, "PingFang SC", "Microsoft YaHei",
               "Segoe UI", Roboto, "Helvetica Neue", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

a { color: inherit; text-decoration: none; }
img, svg { display: block; max-width: 100%; }
::selection { background: rgba(139,92,246,.4); color: #fff; }

.container {
  width: min(var(--container), 90%);
  margin: 0 auto;
  position: relative;
  z-index: 2;
}

/* ---------- Reveal animation ---------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(32px);
  transition: opacity .8s cubic-bezier(.16,1,.3,1),
              transform .8s cubic-bezier(.16,1,.3,1);
}
[data-reveal].visible {
  opacity: 1;
  transform: none;
}
[data-reveal][data-delay="1"] { transition-delay: .15s; }
[data-reveal][data-delay="2"] { transition-delay: .3s; }
[data-reveal][data-delay="3"] { transition-delay: .45s; }

/* ---------- Shared section head ---------- */
.eyebrow {
  font-size: .8rem;
  font-weight: 700;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--accent-purple);
  margin-bottom: 12px;
}

.section-head {
  text-align: center;
  max-width: 800px;
  margin: 0 auto 72px;
}

.section-head h2 {
  font-size: clamp(1.6rem, 3.5vw, 2.6rem);
  font-weight: 800;
  line-height: 1.3;
  letter-spacing: -.02em;
}

/* =============================================================
   SECTION 1: HERO
   ============================================================= */
.hero {
  position: relative;
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 80px 0 60px;
  overflow: hidden;
}

/* Background effects */
.hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  overflow: hidden;
}
.hero-glow {
  position: absolute;
  border-radius: 50%;
  filter: blur(100px);
  pointer-events: none;
  opacity: .6;
}
.hero-glow--1 {
  width: 700px; height: 700px;
  top: -20%; left: 15%;
  background: radial-gradient(circle, rgba(139,92,246,.3), transparent 70%);
  animation: glow-drift 12s ease-in-out infinite alternate;
}
.hero-glow--2 {
  width: 600px; height: 600px;
  bottom: -15%; right: 10%;
  background: radial-gradient(circle, rgba(59,130,246,.25), transparent 70%);
  animation: glow-drift 10s ease-in-out infinite alternate-reverse;
}
.hero-glow--3 {
  width: 500px; height: 500px;
  top: 25%; right: 25%;
  background: radial-gradient(circle, rgba(6,182,212,.2), transparent 70%);
  animation: glow-drift 14s ease-in-out infinite alternate;
}

/* Animated floating orb */
.hero-orb {
  position: absolute;
  width: 320px; height: 320px;
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  border-radius: 50%;
  background: conic-gradient(from 0deg, rgba(139,92,246,.15), rgba(59,130,246,.1), rgba(6,182,212,.15), rgba(139,92,246,.15));
  filter: blur(60px);
  animation: orb-spin 20s linear infinite;
  pointer-events: none;
}

@keyframes glow-drift {
  0%   { transform: translate(0, 0); }
  100% { transform: translate(30px, -20px); }
}
@keyframes orb-spin {
  0%   { transform: translate(-50%, -50%) rotate(0deg); }
  100% { transform: translate(-50%, -50%) rotate(360deg); }
}

.hero-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(139,92,246,.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(139,92,246,.04) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(ellipse at 50% 40%, #000 30%, transparent 75%);
}

.hero-content {
  text-align: center;
  position: relative;
  z-index: 2;
}

.hero-eyebrow {
  font-size: .88rem;
  font-weight: 600;
  letter-spacing: .18em;
  color: var(--text-2);
  margin-bottom: 28px;
}

.hero-title {
  font-size: clamp(2.2rem, 7vw, 4.2rem);
  font-weight: 900;
  line-height: 1.12;
  letter-spacing: -.03em;
  margin-bottom: 24px;
}

.gradient-text {
  background: linear-gradient(135deg, var(--accent-blue), var(--accent-purple), var(--accent-cyan));
  background-size: 200% 200%;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: gradient-shift 6s ease-in-out infinite;
}
@keyframes gradient-shift {
  0%, 100% { background-position: 0% 50%; }
  50%      { background-position: 100% 50%; }
}

.hero-sub {
  font-size: clamp(1.05rem, 2.2vw, 1.35rem);
  color: var(--text-2);
  max-width: 620px;
  margin: 0 auto 48px;
  line-height: 1.7;
}

.hero-pres-btn {
  position: relative;
  top: -10px;
}

/* Hero stats */
.hero-stats {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 0;
  margin-bottom: 40px;
}

.stat {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 0 36px;
}

.stat-num {
  font-size: clamp(2.2rem, 5vw, 3.6rem);
  font-weight: 900;
  letter-spacing: -.04em;
  line-height: 1;
  background: linear-gradient(135deg, #fff, var(--accent-purple));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.stat-num small {
  font-size: .5em;
  -webkit-text-fill-color: inherit;
}

.stat-label {
  font-size: .82rem;
  color: var(--text-3);
  font-weight: 600;
  margin-top: 6px;
  letter-spacing: .06em;
}

.stat-divider {
  width: 1px;
  height: 48px;
  background: linear-gradient(to bottom, transparent, var(--text-3), transparent);
  flex-shrink: 0;
}

/* Hero quote */
.hero-quote {
  max-width: 700px;
  margin: 0 auto 48px;
  padding: 20px 32px;
  font-size: clamp(1rem, 2vw, 1.2rem);
  font-weight: 500;
  color: var(--text-2);
  line-height: 1.8;
  border-left: 3px solid var(--accent-purple);
  background: linear-gradient(90deg, rgba(139,92,246,.06), transparent);
  border-radius: 0 var(--r) var(--r) 0;
  text-align: center;
}
.hero-quote em {
  font-style: normal;
  font-weight: 700;
  color: var(--text);
  background: linear-gradient(135deg, var(--accent-blue), var(--accent-purple));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* Hero badges — 2-row grouped layout */
.hero-badges {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 24px;
}

.badge-group {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: 12px;
}

.badge-group-label {
  font-size: .68rem;
  font-weight: 600;
  letter-spacing: .12em;
  color: var(--text-3);
  padding: 5px 14px;
  border-radius: var(--r-pill);
  border: 1px solid var(--border-card);
  background: rgba(255,255,255,.03);
  flex-shrink: 0;
}

.badge {
  display: flex;
  align-items: center;
  gap: 0;
  padding: 10px 24px 10px 16px;
  font-size: .85rem;
  font-weight: 600;
  border-radius: var(--r-pill);
  border: 1px solid color-mix(in srgb, var(--badge-color) 40%, transparent);
  color: var(--badge-color);
  background: color-mix(in srgb, var(--badge-color) 8%, transparent);
  transition: background .35s, transform .35s, box-shadow .35s, border-color .35s;
  position: relative;
  overflow: hidden;
}

.badge-main {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-height: 28px;
  min-width: 0;
  flex: 1;
  padding-right: 22px;
}

/* Shimmer effect on badges */
.badge::before {
  content: "";
  position: absolute;
  top: 0; left: -100%; right: 0; bottom: 0;
  width: 200%;
  background: linear-gradient(
    90deg,
    transparent 0%,
    color-mix(in srgb, var(--badge-color) 12%, transparent) 50%,
    transparent 100%
  );
  animation: badge-shimmer 4s ease-in-out infinite;
  animation-delay: calc(var(--badge-delay, 0) * .5s);
  pointer-events: none;
}
@keyframes badge-shimmer {
  0%, 100% { transform: translateX(-30%); }
  50%      { transform: translateX(30%); }
}

.badge:hover {
  background: color-mix(in srgb, var(--badge-color) 22%, transparent);
  border-color: color-mix(in srgb, var(--badge-color) 60%, transparent);
  transform: translateY(-4px) scale(1.04);
  box-shadow:
    0 0 20px color-mix(in srgb, var(--badge-color) 30%, transparent),
    0 12px 32px -8px color-mix(in srgb, var(--badge-color) 40%, transparent);
}

.badge-icon {
  width: 22px;
  height: 22px;
  flex-shrink: 0;
}

.badge-cn {
  font-weight: 800;
  font-size: 1rem;
  letter-spacing: .06em;
}

.badge-en {
  font-weight: 500;
  font-size: .76rem;
  opacity: .65;
  letter-spacing: .03em;
}

.badge-detail {
  margin-left: 12px;
  width: 34px;
  height: 34px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  border-radius: 50%;
  border: 1px solid color-mix(in srgb, var(--badge-color) 35%, transparent);
  color: color-mix(in srgb, var(--badge-color) 80%, white);
  font-size: .96rem;
  font-weight: 700;
  line-height: 1;
  background: color-mix(in srgb, var(--badge-color) 8%, transparent);
  transition: background .25s, border-color .25s, transform .25s;
  opacity: .72;
  position: relative;
  z-index: 2;
  flex-shrink: 0;
}

.badge-detail:hover {
  background: color-mix(in srgb, var(--badge-color) 15%, transparent);
  border-color: color-mix(in srgb, var(--badge-color) 55%, transparent);
  transform: translateY(-1px);
  opacity: 1;
}

/* Scroll hint */
.scroll-hint {
  position: absolute;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%);
  color: var(--text-3);
  animation: float-hint 2s ease-in-out infinite;
  z-index: 2;
}
@keyframes float-hint {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50% { transform: translateX(-50%) translateY(8px); }
}

/* =============================================================
   SECTION 2: WORKFLOW
   ============================================================= */
.workflow {
  padding: var(--section-gap) 0;
  position: relative;
  overflow: hidden;
}

/* Background glows */
.workflow-bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 0;
}
.workflow-glow--l {
  position: absolute;
  width: 600px; height: 600px;
  top: 10%; left: -8%;
  background: radial-gradient(circle, rgba(139,92,246,.12), transparent 70%);
  filter: blur(80px);
  animation: glow-drift 14s ease-in-out infinite alternate;
}
.workflow-glow--r {
  position: absolute;
  width: 500px; height: 500px;
  bottom: 5%; right: -5%;
  background: radial-gradient(circle, rgba(59,130,246,.1), transparent 70%);
  filter: blur(80px);
  animation: glow-drift 10s ease-in-out infinite alternate-reverse;
}

.flow-pipeline {
  display: flex;
  align-items: flex-start;
  justify-content: center;
  gap: 0;
  padding: 20px 0;
  position: relative;
}

.flow-node {
  flex: 0 0 190px;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  position: relative;
  z-index: 2;
}

/* Glowing ring icon */
.flow-ring {
  width: 84px;
  height: 84px;
  margin: 0 auto 18px;
  border-radius: 50%;
  background: rgba(15, 20, 35, .9);
  border: 2px solid color-mix(in srgb, var(--node-c) 50%, transparent);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--node-c);
  position: relative;
  box-shadow:
    0 0 24px color-mix(in srgb, var(--node-c) 20%, transparent),
    inset 0 0 16px color-mix(in srgb, var(--node-c) 8%, transparent);
  transition: transform .4s, box-shadow .4s, border-color .4s;
}
.flow-ring::before {
  content: "";
  position: absolute;
  inset: -5px;
  border-radius: 50%;
  background: conic-gradient(from 0deg, transparent 30%, color-mix(in srgb, var(--node-c) 35%, transparent) 50%, transparent 70%);
  animation: ring-spin 6s linear infinite;
  z-index: -1;
}
@keyframes ring-spin {
  to { transform: rotate(360deg); }
}
.flow-node:hover .flow-ring {
  transform: scale(1.12);
  box-shadow:
    0 0 40px color-mix(in srgb, var(--node-c) 35%, transparent),
    0 0 80px color-mix(in srgb, var(--node-c) 15%, transparent),
    inset 0 0 24px color-mix(in srgb, var(--node-c) 12%, transparent);
  border-color: var(--node-c);
}
.flow-ring svg {
  width: 34px;
  height: 34px;
  position: relative;
  z-index: 1;
}

.flow-node h3 {
  font-size: 1.15rem;
  font-weight: 800;
  margin-bottom: 14px;
  letter-spacing: .03em;
}

/* Keyword chips */
.flow-kws {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-content: flex-start;
  gap: 5px;
  min-height: 88px;
  margin-bottom: 14px;
  padding: 0 2px;
}
.flow-kws span {
  font-size: .72rem;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: var(--r-pill);
  background: rgba(255,255,255,.04);
  border: 1px solid rgba(255,255,255,.08);
  color: var(--text-2);
  white-space: nowrap;
  transition: background .25s, border-color .25s, color .25s;
}
.flow-node:hover .flow-kws span {
  border-color: color-mix(in srgb, var(--node-c) 30%, transparent);
  color: color-mix(in srgb, var(--node-c) 70%, white);
  background: color-mix(in srgb, var(--node-c) 8%, transparent);
}

/* Colored dots */
.flow-dots {
  display: flex;
  justify-content: center;
  gap: 6px;
}
.flow-dots span {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--dot-c);
  box-shadow: 0 0 6px color-mix(in srgb, var(--dot-c) 50%, transparent);
  transition: transform .25s, box-shadow .25s;
}
.flow-dots span:hover {
  transform: scale(1.5);
  box-shadow: 0 0 12px var(--dot-c);
}

/* Animated connector beam */
.flow-connector {
  flex: 0 0 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding-top: 30px;
  position: relative;
  height: 84px;
}
.flow-connector::before {
  content: "";
  width: 44px;
  height: 2px;
  background: linear-gradient(90deg,
    rgba(139,92,246,.08),
    rgba(139,92,246,.35),
    rgba(59,130,246,.35),
    rgba(59,130,246,.08));
  border-radius: 1px;
}
.flow-pulse {
  position: absolute;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent-purple);
  box-shadow: 0 0 10px var(--accent-purple), 0 0 20px rgba(139,92,246,.3);
  animation: pulse-travel 3s ease-in-out infinite;
  top: 39px;
}
@keyframes pulse-travel {
  0%   { left: 0; opacity: 0; }
  15%  { opacity: 1; }
  85%  { opacity: 1; }
  100% { left: 38px; opacity: 0; }
}

/* =============================================================
   SECTION 2.5: INSIGHTS ("三个向")
   ============================================================= */
.insights {
  padding: var(--section-gap) 0;
  position: relative;
}

/* Subtle background accent */
.insights::before {
  content: "";
  position: absolute;
  top: 50%; left: 50%;
  width: 800px; height: 600px;
  transform: translate(-50%, -50%);
  background: radial-gradient(ellipse, rgba(139,92,246,.06), transparent 70%);
  pointer-events: none;
}

/* --- Vertical Flow Layout --- */
.insight-flow {
  position: relative;
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 0;
}

/* Vertical connecting line */
.insight-flow::before {
  content: "";
  position: absolute;
  left: 68px;
  top: 32px;
  bottom: 32px;
  width: 2px;
  background: linear-gradient(to bottom, #8b5cf6, #06b6d4, #6366f1);
  opacity: .3;
  border-radius: 1px;
}

.insight-step {
  display: grid;
  grid-template-columns: 100px 1fr;
  gap: 32px;
  padding: 32px 0;
  position: relative;
}

.insight-step-left {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  position: relative;
  z-index: 2;
}

.insight-scope {
  font-size: .68rem;
  font-weight: 600;
  letter-spacing: .12em;
  color: var(--insight-color);
  text-align: center;
  opacity: .6;
}

.insight-step-num {
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--insight-color);
  line-height: 1;
  opacity: .35;
}

.insight-step-dot {
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--insight-color);
  box-shadow: 0 0 16px var(--insight-color), 0 0 32px color-mix(in srgb, var(--insight-color) 40%, transparent);
  position: relative;
}
.insight-step-dot::after {
  content: "";
  position: absolute;
  inset: -5px;
  border-radius: 50%;
  border: 1.5px solid var(--insight-color);
  opacity: .3;
}

.insight-step-body {
  padding: 28px 32px;
  border-radius: var(--r);
  border: 1px solid var(--border-card);
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  position: relative;
  overflow: hidden;
  transition: border-color .35s, box-shadow .35s;
}

/* Gradient left edge */
.insight-step-body::before {
  content: "";
  position: absolute;
  top: 0; left: 0; bottom: 0;
  width: 3px;
  background: linear-gradient(to bottom,
    color-mix(in srgb, var(--insight-color) 80%, transparent),
    color-mix(in srgb, var(--insight-color) 15%, transparent));
}

.insight-step-body:hover {
  border-color: color-mix(in srgb, var(--insight-color) 25%, transparent);
  box-shadow: 0 16px 48px -12px color-mix(in srgb, var(--insight-color) 15%, transparent);
}

.insight-step-body h3 {
  font-size: clamp(1.25rem, 2.5vw, 1.6rem);
  font-weight: 800;
  line-height: 1.35;
  margin-bottom: 12px;
  letter-spacing: -.01em;
}
.insight-step-body h3 em {
  font-style: normal;
  color: var(--insight-color);
}
.insight-step-body > p {
  font-size: .88rem;
  color: var(--text-2);
  line-height: 1.7;
  margin-bottom: 16px;
}

.insight-step-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.insight-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 14px;
  border-radius: 999px;
  font-size: .78rem;
  font-weight: 600;
  text-decoration: none;
  background: color-mix(in srgb, var(--tag-c, #8b5cf6) 8%, transparent);
  border: 1px solid color-mix(in srgb, var(--tag-c, #8b5cf6) 20%, transparent);
  color: var(--tag-c, #8b5cf6);
  transition: background .25s, box-shadow .25s;
}
.insight-tag::before {
  content: "";
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--tag-c, #8b5cf6);
  box-shadow: 0 0 6px var(--tag-c, #8b5cf6);
  flex-shrink: 0;
}
.insight-tag:hover {
  background: color-mix(in srgb, var(--tag-c, #8b5cf6) 15%, transparent);
  box-shadow: 0 0 16px color-mix(in srgb, var(--tag-c, #8b5cf6) 20%, transparent);
}

/* Legacy grid (kept for reference, no longer used) */
.insight-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  max-width: 960px;
  margin: 0 auto;
}

.insight-card {
  position: relative;
  padding: 36px 32px 28px;
  border-radius: var(--r);
  border: 1px solid var(--border-card);
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  overflow: hidden;
  transition: transform .35s, border-color .35s, box-shadow .35s;
}

/* Gradient top edge */
.insight-card::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: linear-gradient(90deg,
    color-mix(in srgb, var(--insight-color) 80%, transparent),
    color-mix(in srgb, var(--insight-color) 20%, transparent));
  opacity: .7;
}

.insight-card:hover {
  transform: translateY(-4px);
  border-color: color-mix(in srgb, var(--insight-color) 30%, transparent);
  box-shadow: 0 20px 50px -15px color-mix(in srgb, var(--insight-color) 20%, transparent);
}

.insight-num {
  display: inline-block;
  font-size: .72rem;
  font-weight: 700;
  color: var(--insight-color);
  opacity: .6;
  letter-spacing: .1em;
  margin-bottom: 12px;
}

.insight-card h3 {
  font-size: clamp(1.2rem, 2.5vw, 1.5rem);
  font-weight: 800;
  line-height: 1.35;
  margin-bottom: 14px;
  letter-spacing: -.01em;
}

.insight-card h3 em {
  font-style: normal;
  color: var(--insight-color);
}

.insight-card > p {
  font-size: .85rem;
  color: var(--text-2);
  line-height: 1.65;
  margin-bottom: 16px;
}

/* Inline project reference */
.insight-ref {
  font-size: .78rem;
  color: var(--text-3);
  margin-top: 4px;
}
.insight-ref span {
  font-weight: 600;
}

/* =============================================================
   SECTION 3: PROJECT MATRIX
   ============================================================= */
.projects {
  padding: var(--section-gap) 0;
  position: relative;
  overflow: hidden;
}
.projects::before {
  content: "";
  position: absolute;
  top: 30%; left: 50%;
  width: 800px; height: 600px;
  transform: translate(-50%, -50%);
  background: radial-gradient(ellipse, rgba(139,92,246,.06), transparent 70%);
  pointer-events: none;
  filter: blur(60px);
}

.project-group-title {
  font-size: 1.1rem;
  font-weight: 600;
  color: rgba(255,255,255,.55);
  letter-spacing: .08em;
  margin: 48px 0 20px;
  padding-left: 12px;
  border-left: 3px solid rgba(139,92,246,.5);
}
.project-group-title:first-of-type { margin-top: 0; }

.project-grid {
  display: grid;
  gap: 16px;
}
.project-grid--2,
.project-grid--3,
.project-grid--1 { grid-template-columns: 1fr; }

.project-card {
  position: relative;
  display: grid;
  grid-template-areas:
    "preview logo"
    "preview body"
    "preview cta";
  grid-template-columns: 320px 1fr;
  grid-template-rows: auto 1fr auto;
  width: 100%;
  max-width: 860px;
  margin: 0 auto;
  padding: 0;
  border-radius: var(--r);
  border: 1px solid var(--border-card);
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  overflow: hidden;
  transition: transform .35s, border-color .35s, box-shadow .35s;
  cursor: pointer;
}

.project-card:hover {
  transform: translateY(-5px);
  border-color: color-mix(in srgb, var(--card-color) 50%, transparent);
  box-shadow:
    0 0 0 1px color-mix(in srgb, var(--card-color) 20%, transparent),
    0 4px 20px color-mix(in srgb, var(--card-color) 15%, transparent),
    0 24px 60px -15px color-mix(in srgb, var(--card-color) 30%, transparent);
}

/* Card preview mockup */
.card-preview {
  grid-area: preview;
  margin: 0;
  min-height: 220px;
  border-radius: calc(var(--r) - 1px) 0 0 calc(var(--r) - 1px);
  overflow: hidden;
  background: #0c1019;
  border-right: 1px solid var(--border-card);
  transition: opacity .35s;
}
.card-preview svg {
  width: 100%;
  height: 100%;
  display: block;
}
.project-card:hover .card-preview {
  opacity: .85;
}

/* Card logo icon */
.card-logo {
  grid-area: logo;
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: color-mix(in srgb, var(--card-color) 12%, transparent);
  border: 1px solid color-mix(in srgb, var(--card-color) 25%, transparent);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 36px 36px 0;
  color: var(--card-color);
  transition: box-shadow .35s, transform .35s, background .35s;
}
.card-logo svg {
  width: 26px;
  height: 26px;
}
.project-card:hover .card-logo {
  box-shadow:
    0 0 24px color-mix(in srgb, var(--card-color) 50%, transparent),
    0 0 48px color-mix(in srgb, var(--card-color) 20%, transparent);
  background: color-mix(in srgb, var(--card-color) 22%, transparent);
  transform: scale(1.1);
}

/* Card glow on hover */
.project-card::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 140px;
  background: linear-gradient(to top, color-mix(in srgb, var(--card-color) 12%, transparent), transparent);
  opacity: 0;
  transition: opacity .35s;
  pointer-events: none;
}
.project-card:hover::after { opacity: 1; }

.card-body {
  grid-area: body;
  padding: 20px 36px 0;
  min-width: 0;
}

.card-name-cn {
  font-size: 1.4rem;
  font-weight: 800;
  letter-spacing: .03em;
  margin-bottom: 6px;
}

.card-name-en {
  font-size: .8rem;
  color: var(--text-3);
  font-weight: 500;
  margin-bottom: 12px;
  letter-spacing: .05em;
}

.card-desc {
  font-size: .88rem;
  color: var(--text-2);
  line-height: 1.5;
  margin-bottom: 16px;
}

/* Project-colored tags */
.card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 20px;
}

.card-tags span {
  font-size: .72rem;
  font-weight: 600;
  padding: 4px 12px;
  border-radius: var(--r-pill);
  border: 1px solid color-mix(in srgb, var(--tag-c) 35%, transparent);
  color: var(--tag-c);
  background: color-mix(in srgb, var(--tag-c) 8%, transparent);
  transition: background .25s, border-color .25s;
}
.project-card:hover .card-tags span {
  border-color: color-mix(in srgb, var(--tag-c) 50%, transparent);
  background: color-mix(in srgb, var(--tag-c) 14%, transparent);
}

.card-cta {
  grid-area: cta;
  display: inline-flex;
  align-items: center;
  font-size: .82rem;
  font-weight: 600;
  padding: 16px 36px 36px;
  color: var(--card-color);
  transition: gap .25s, letter-spacing .25s;
}
.project-card:hover .card-cta { gap: 6px; letter-spacing: .02em; }

/* =============================================================
   SECTION 4: CORE CHANGES
   ============================================================= */
.changes {
  padding: var(--section-gap) 0;
  position: relative;
  overflow: hidden;
}

.changes-bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
}
.changes-glow {
  position: absolute;
  width: 700px; height: 500px;
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  background: radial-gradient(ellipse, rgba(139,92,246,.07), transparent 70%);
  filter: blur(60px);
}

.change-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  max-width: 960px;
  margin: 0 auto;
}

.change-card {
  position: relative;
  padding: 32px 28px 24px;
  border-radius: var(--r);
  border: 1px solid var(--border-card);
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  overflow: hidden;
  transition: transform .35s, box-shadow .35s, border-color .35s;
}
/* Gradient top bar */
.change-card::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: linear-gradient(90deg,
    color-mix(in srgb, var(--change-c) 80%, transparent),
    color-mix(in srgb, var(--change-c) 15%, transparent));
}
/* Hover glow */
.change-card::after {
  content: "";
  position: absolute;
  bottom: -30px; left: 50%;
  width: 160px; height: 120px;
  transform: translateX(-50%);
  background: radial-gradient(circle, color-mix(in srgb, var(--change-c) 15%, transparent), transparent 70%);
  opacity: 0;
  transition: opacity .4s;
  pointer-events: none;
}
.change-card:hover {
  transform: translateY(-4px);
  border-color: color-mix(in srgb, var(--change-c) 35%, transparent);
  box-shadow: 0 20px 50px -15px color-mix(in srgb, var(--change-c) 25%, transparent);
}
.change-card:hover::after { opacity: 1; }

.change-num {
  font-size: .72rem;
  font-weight: 700;
  color: var(--change-c);
  opacity: .5;
  letter-spacing: .1em;
  margin-bottom: 18px;
}

.change-flow {
  display: flex;
  flex-direction: row;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 6px 10px;
  margin-bottom: 22px;
}

.change-before {
  font-size: .92rem;
  font-weight: 600;
  color: var(--text-3);
  text-decoration: line-through;
  text-decoration-color: color-mix(in srgb, var(--text-3) 50%, transparent);
  text-decoration-thickness: 1.5px;
}

.change-arrow {
  display: inline-block;
  width: auto;
  height: auto;
  background: none;
  border-radius: 0;
  margin: 0;
  position: static;
  color: var(--change-c);
  opacity: .75;
  font-size: 1rem;
  line-height: 1.4;
}
.change-arrow::before { content: "→"; }
.change-arrow::after { display: none; }

.change-after {
  font-size: clamp(1.3rem, 2.2vw, 1.6rem);
  font-weight: 900;
  background: linear-gradient(135deg, #fff, var(--change-c));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: .02em;
  line-height: 1.35;
}

.change-meta {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
}

.change-tag {
  font-size: .75rem;
  font-weight: 700;
  padding: 4px 14px;
  border-radius: var(--r-pill);
  border: 1px solid color-mix(in srgb, var(--change-c) 35%, transparent);
  color: var(--change-c);
  background: color-mix(in srgb, var(--change-c) 8%, transparent);
}

.change-en {
  font-size: .72rem;
  font-weight: 500;
  color: var(--text-3);
  letter-spacing: .04em;
}

/* =============================================================
   SECTION 5: SECURITY
   ============================================================= */
.security {
  padding: var(--section-gap) 0;
  position: relative;
  overflow: hidden;
}

/* Background glows */
.security-bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 0;
}
.security-glow--l {
  position: absolute;
  width: 500px; height: 500px;
  top: 15%; left: -5%;
  background: radial-gradient(circle, rgba(6,182,212,.08), transparent 70%);
  filter: blur(80px);
  animation: glow-drift 12s ease-in-out infinite alternate;
}
.security-glow--r {
  position: absolute;
  width: 400px; height: 400px;
  bottom: 10%; right: -3%;
  background: radial-gradient(circle, rgba(139,92,246,.06), transparent 70%);
  filter: blur(80px);
  animation: glow-drift 10s ease-in-out infinite alternate-reverse;
}

.security-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-bottom: 40px;
}

.security-item {
  position: relative;
  text-align: center;
  padding: 36px 20px 28px;
  border-radius: var(--r);
  border: 1px solid var(--border-card);
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  overflow: hidden;
  transition: transform .35s, border-color .35s, box-shadow .35s;
}
/* Gradient top bar */
.security-item::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: linear-gradient(90deg,
    color-mix(in srgb, var(--sec-c) 70%, transparent),
    color-mix(in srgb, var(--sec-c) 15%, transparent));
}
/* Hover glow */
.security-item::after {
  content: "";
  position: absolute;
  bottom: -20px; left: 50%;
  width: 120px; height: 100px;
  transform: translateX(-50%);
  background: radial-gradient(circle, color-mix(in srgb, var(--sec-c) 12%, transparent), transparent 70%);
  opacity: 0;
  transition: opacity .4s;
  pointer-events: none;
}
.security-item:hover {
  transform: translateY(-4px);
  border-color: color-mix(in srgb, var(--sec-c) 30%, transparent);
  box-shadow: 0 20px 50px -15px color-mix(in srgb, var(--sec-c) 20%, transparent);
}
.security-item:hover::after { opacity: 1; }

/* Glowing ring icon */
.security-ring {
  width: 64px;
  height: 64px;
  margin: 0 auto 18px;
  border-radius: 50%;
  background: rgba(15, 20, 35, .9);
  border: 2px solid color-mix(in srgb, var(--sec-c) 45%, transparent);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--sec-c);
  position: relative;
  box-shadow:
    0 0 20px color-mix(in srgb, var(--sec-c) 15%, transparent),
    inset 0 0 12px color-mix(in srgb, var(--sec-c) 6%, transparent);
  transition: box-shadow .35s, border-color .35s, transform .35s;
}
.security-ring::before {
  content: "";
  position: absolute;
  inset: -4px;
  border-radius: 50%;
  background: conic-gradient(from 0deg, transparent 30%, color-mix(in srgb, var(--sec-c) 30%, transparent) 50%, transparent 70%);
  animation: ring-spin 8s linear infinite;
  z-index: -1;
}
.security-ring svg {
  width: 28px;
  height: 28px;
  position: relative;
  z-index: 1;
}
.security-item:hover .security-ring {
  transform: scale(1.1);
  box-shadow:
    0 0 32px color-mix(in srgb, var(--sec-c) 30%, transparent),
    0 0 60px color-mix(in srgb, var(--sec-c) 12%, transparent),
    inset 0 0 20px color-mix(in srgb, var(--sec-c) 10%, transparent);
  border-color: var(--sec-c);
}

.security-item h3 {
  font-size: 1.05rem;
  font-weight: 800;
  margin-bottom: 8px;
  letter-spacing: .02em;
}

.security-item p {
  font-size: .82rem;
  color: var(--text-2);
  line-height: 1.6;
}

.security-footnote {
  text-align: center;
  font-size: .85rem;
  color: var(--text-3);
  padding: 20px 0;
  border-top: 1px solid var(--border-card);
}

/* =============================================================
   SECTION 5.5: CLOSING QUOTE
   ============================================================= */
.closing-quote-section {
  padding: var(--section-gap) 0;
  position: relative;
}

.closing-eyebrow {
  text-align: center;
  font-size: .75rem;
  font-weight: 700;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--text-3);
  margin-bottom: 48px;
}

.closing-two {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 0;
  align-items: center;
  max-width: 900px;
  margin: 0 auto;
}

.closing-item {
  padding: 48px 40px;
  text-align: center;
}

.closing-num {
  display: block;
  font-size: .72rem;
  font-weight: 800;
  letter-spacing: .2em;
  color: var(--ci-c, #fff);
  opacity: .5;
  margin-bottom: 20px;
}

.closing-big {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 900;
  line-height: 1.15;
  color: #fff;
  margin-bottom: 20px;
}

.closing-big em {
  font-style: normal;
  color: var(--ci-c);
  -webkit-text-fill-color: var(--ci-c);
}

.closing-sub {
  font-size: clamp(.85rem, 1.5vw, 1rem);
  color: var(--text-3);
  line-height: 1.7;
}

.closing-divider {
  width: 1px;
  height: 160px;
  background: linear-gradient(to bottom, transparent, rgba(255,255,255,.12), transparent);
}

.closing-quote-section::before {
  content: "";
  position: absolute;
  top: 50%; left: 50%;
  width: 600px; height: 400px;
  transform: translate(-50%, -50%);
  background: radial-gradient(ellipse, rgba(139,92,246,.08), transparent 70%);
  pointer-events: none;
}

.closing-quote {
  max-width: 780px;
  margin: 0 auto;
  text-align: center;
  padding: 48px 40px;
  border-radius: var(--r);
  border: 1px solid var(--border-card);
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.closing-quote p:first-child {
  font-size: clamp(1rem, 2vw, 1.15rem);
  color: var(--text-2);
  margin-bottom: 16px;
}

.closing-quote-highlight {
  font-size: clamp(1.15rem, 2.5vw, 1.45rem);
  font-weight: 700;
  line-height: 1.6;
  color: var(--text);
}

.closing-quote-highlight em {
  font-style: normal;
  background: linear-gradient(135deg, var(--accent-blue), var(--accent-purple));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  font-weight: 800;
}

/* =============================================================
   SECTION 6: FOOTER / CLOSING
   ============================================================= */
.closing {
  padding: var(--section-gap) 0 60px;
}

.footer-nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 14px;
  margin-bottom: 48px;
}

.footer-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px 12px 20px;
  border-radius: var(--r-pill);
  font-size: .9rem;
  font-weight: 600;
  border: 1px solid color-mix(in srgb, var(--link-c) 35%, transparent);
  color: var(--link-c);
  background: color-mix(in srgb, var(--link-c) 6%, transparent);
  transition: background .3s, transform .3s, box-shadow .3s, border-color .3s;
}
.footer-link:hover {
  background: color-mix(in srgb, var(--link-c) 20%, transparent);
  border-color: color-mix(in srgb, var(--link-c) 55%, transparent);
  transform: translateY(-3px);
  box-shadow:
    0 0 16px color-mix(in srgb, var(--link-c) 25%, transparent),
    0 10px 28px -8px color-mix(in srgb, var(--link-c) 35%, transparent);
}

.footer-link-icon {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}

.footer-bottom {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  padding-top: 32px;
  border-top: 1px solid var(--border-card);
}

.back-top {
  padding: 10px 24px;
  border-radius: var(--r-pill);
  font-size: .85rem;
  font-weight: 600;
  border: 1px solid var(--border-card);
  color: var(--text-2);
  transition: border-color .25s, color .25s;
}
.back-top:hover {
  border-color: var(--accent-purple);
  color: var(--accent-purple);
}

.footer-note {
  font-size: .82rem;
  color: var(--text-3);
}

/* =============================================================
   RESPONSIVE
   ============================================================= */
@media (max-width: 1024px) {
  .project-card { grid-template-columns: 240px 1fr; max-width: 720px; }

  .change-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .security-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .insight-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .insight-step { gap: 24px; }
  .insight-flow::before { left: 50px; }

  .flow-pipeline {
    gap: 0;
    justify-content: flex-start;
    padding: 20px 16px;
  }
  .flow-node { flex: 0 0 160px; }

  .hero-stats { gap: 0; }
  .stat { padding: 0 24px; }
}

@media (max-width: 640px) {
  :root { --section-gap: 80px; }

  .container { width: min(var(--container), 94%); }

  .hero {
    min-height: auto;
    padding: 64px 0 40px;
  }

  .hero-title { font-size: clamp(1.8rem, 9vw, 2.6rem); }
  .hero-sub {
    font-size: .98rem;
    margin-bottom: 32px;
  }
  .hero-badges {
    width: 100%;
    gap: 14px;
  }
  .badge-group {
    width: 100%;
    gap: 8px;
  }
  .badge-group-label { width: 100%; text-align: center; }
  .badge {
    width: 100%;
    justify-content: flex-start;
    padding: 11px 12px;
  }
  .badge-main { padding: 0 18px 0 12px; }
  .badge-detail {
    margin-left: 10px;
    width: 32px;
    height: 32px;
  }
  .badge-cn { font-size: .92rem; }
  .badge-en { font-size: .72rem; }
  .scroll-hint { display: none; }

  .hero-stats {
    flex-direction: column;
    gap: 20px;
  }
  .stat-divider {
    width: 48px;
    height: 1px;
  }
  .stat { padding: 0; }

  .hero-quote {
    padding: 16px 20px;
    font-size: .95rem;
  }

  /* Revert project cards to vertical layout on mobile */
  .project-card {
    display: flex;
    flex-direction: column;
    padding: 22px 18px 18px;
  }
  .card-preview {
    grid-area: unset;
    margin: -22px -18px 14px;
    border-radius: 16px 16px 0 0;
    border-right: none;
    border-bottom: 1px solid var(--border-card);
  }
  .card-preview svg { height: auto; }
  .card-logo {
    grid-area: unset;
    margin: 0 0 16px;
  }
  .card-body {
    grid-area: unset;
    padding: 0;
    flex: 1;
  }
  .card-cta {
    grid-area: unset;
    padding: 0;
  }
  .card-name-cn { font-size: 1.28rem; }
  .card-desc { font-size: .84rem; }

  .insight-grid {
    grid-template-columns: 1fr;
    gap: 14px;
  }
  .insight-card { padding: 24px 20px; }
  .insight-step {
    grid-template-columns: 60px 1fr;
    gap: 16px;
    padding: 20px 0;
  }
  .insight-step-left { gap: 4px; }
  .insight-scope { font-size: .6rem; }
  .insight-step-num { font-size: 1.3rem; }
  .insight-step-dot { width: 12px; height: 12px; }
  .insight-step-body { padding: 20px; }
  .insight-flow::before { left: 30px; }

  .change-grid {
    grid-template-columns: 1fr;
  }

  .change-card {
    flex-wrap: wrap;
    gap: 8px;
    padding: 20px 24px;
  }
  .change-project {
    width: 100%;
    margin-left: 0;
    margin-top: 4px;
  }

  .security-grid {
    grid-template-columns: 1fr;
  }
  .security-item { padding: 28px 18px 22px; }

  /* ── 移动端：纵向时间线布局 ── */
  .flow-pipeline {
    flex-direction: column;
    overflow-x: visible;
    padding: 8px 0;
    gap: 0;
    align-items: stretch;
  }

  /* 节点：左图标 + 右内容，用 grid 实现 */
  .flow-node {
    display: grid;
    grid-template-columns: 64px 1fr;
    grid-template-rows: auto auto auto;
    column-gap: 16px;
    flex: none;
    width: 100%;
    text-align: left;
    padding: 4px 0;
    min-height: unset;
  }

  /* 图标圈跨三行，固定左侧 */
  .flow-ring {
    grid-column: 1;
    grid-row: 1 / 4;
    align-self: start;
    width: 60px;
    height: 60px;
  }
  .flow-ring svg { width: 26px; height: 26px; }

  .flow-node h3 {
    grid-column: 2;
    grid-row: 1;
    font-size: 1rem;
    margin: 8px 0 6px;
  }
  .flow-kws {
    grid-column: 2;
    grid-row: 2;
    justify-content: flex-start;
    min-height: unset;
    margin-bottom: 6px;
  }
  .flow-dots {
    grid-column: 2;
    grid-row: 3;
    justify-content: flex-start;
    margin-top: 0;
    padding-top: 0;
    min-height: unset;
  }

  /* 竖向连接线，居中对齐图标圈 */
  .flow-connector {
    flex: 0 0 28px;
    width: 100%;
    height: 28px;
    padding-top: 0;
    align-items: flex-start;
    justify-content: flex-start;
  }
  .flow-connector::before {
    width: 2px;
    height: 28px;
    margin-left: 29px; /* (60px ring / 2) - 1px = 29px */
    background: linear-gradient(180deg,
      rgba(139,92,246,.25),
      rgba(59,130,246,.25));
  }
  .flow-pulse { display: none; }

  .flow-kws span { font-size: .68rem; padding: 3px 8px; }

  .section-head { margin-bottom: 48px; }

  .closing-two {
    grid-template-columns: 1fr;
    gap: 0;
  }
  .closing-divider { width: 80%; height: 1px; margin: 0 auto; }
  .closing-item { padding: 36px 24px; }

  .footer-nav {
    gap: 10px;
    margin-bottom: 36px;
  }
  .footer-link {
    width: 100%;
    justify-content: center;
    padding: 12px 14px;
    font-size: .86rem;
  }
  .back-top { min-height: 44px; display: inline-flex; align-items: center; }
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: .01ms !important;
    transition-duration: .15s !important;
  }
  html { scroll-behavior: auto; }
  [data-reveal] { opacity: 1; transform: none; }
}