/* 鹿鸣慧学官网 — Brand: forest teal + mint */
:root {
  --green-950: #031f19;
  --green-900: #063d32;
  --green-800: #0a5444;
  --green-700: #0d6b56;
  --green-600: #12806a;
  --green-500: #1a9a80;
  --mint-50: #f3faf7;
  --mint-100: #e6f5ef;
  --mint-200: #cceadf;
  --gold: #d4a84b;
  --ink: #14221e;
  --ink-soft: #3d524b;
  --line: rgba(6, 61, 50, 0.12);
  --white: #ffffff;
  --shadow: 0 18px 50px rgba(6, 61, 50, 0.1);
  --radius: 18px;
  --container: 1160px;
  --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
  --font-serif: "Songti SC", "SimSun", "STSong", serif;
}

*,
*::before,
*::after { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font-sans);
  color: var(--ink);
  background:
    radial-gradient(1200px 500px at 10% -10%, rgba(26, 154, 128, 0.08), transparent 60%),
    radial-gradient(900px 400px at 100% 0%, rgba(212, 168, 75, 0.06), transparent 55%),
    linear-gradient(180deg, #f7fcfa 0%, #ffffff 35%, #f4faf7 100%);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }
ul, ol { margin: 0; padding: 0; list-style: none; }
h1, h2, h3, h4 { font-family: var(--font-serif); line-height: 1.25; margin: 0 0 0.6em; font-weight: 700; }
p { margin: 0 0 1em; color: var(--ink-soft); }

.container {
  width: min(100% - 40px, var(--container));
  margin-inline: auto;
}

/* Header */
.site-header {
  position: fixed;
  inset: 0 0 auto;
  z-index: 100;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(14px);
  box-shadow: 0 1px 0 var(--line);
  transition: background .3s, box-shadow .3s, backdrop-filter .3s;
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 72px;
  gap: 20px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}
.brand-logo {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  object-fit: cover;
  box-shadow: 0 0 0 2px rgba(255,255,255,.35);
}
.brand-text { display: flex; flex-direction: column; gap: 2px; }
.brand-text strong {
  font-family: var(--font-serif);
  font-size: 1.15rem;
  color: var(--green-900);
  letter-spacing: 0.04em;
}
.brand-text em {
  font-style: normal;
  font-size: 0.72rem;
  letter-spacing: 0.02em;
  color: var(--green-600);
  white-space: nowrap;
  margin-top: -5px;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 4px;
}
.main-nav a {
  padding: 8px 12px;
  font-size: 0.92rem;
  color: var(--ink-soft);
  border-radius: 999px;
  transition: background .2s, color .2s;
}
.main-nav a:hover,
.main-nav a.active {
  background: var(--mint-100);
  color: var(--green-800);
}
.nav-cta {
  background: var(--gold) !important;
  color: #2a1f08 !important;
  font-weight: 600;
  margin-left: 6px;
}
.nav-cta:hover { filter: brightness(1.05); }

.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  border: 0;
  background: transparent;
  cursor: pointer;
  padding: 10px;
}
.nav-toggle span {
  display: block;
  height: 2px;
  margin: 6px 0;
  background: var(--green-900);
  border-radius: 2px;
  transition: .25s;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 22px;
  border-radius: 999px;
  border: 1px solid transparent;
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  transition: transform .2s, box-shadow .2s, background .2s;
}
.btn:hover { transform: translateY(-1px); }
.btn-lg { padding: 14px 28px; font-size: 1rem; }
.btn-block { width: 100%; }
.btn-primary {
  background: linear-gradient(135deg, var(--green-600), var(--green-800));
  color: #fff;
  box-shadow: 0 10px 28px rgba(10, 84, 68, 0.28);
}
.btn-ghost {
  background: rgba(255,255,255,.12);
  border-color: rgba(255,255,255,.35);
  color: #fff;
  backdrop-filter: blur(6px);
}
.section .btn-ghost {
  background: transparent;
  border-color: var(--green-700);
  color: var(--green-800);
}

/* Hero — full bleed AI 科技背景（靛蓝/琥珀，无绿色） */
.hero {
  position: relative;
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  align-items: flex-end;
  padding: 120px 0 72px;
  color: #fff;
  overflow: hidden;
  background: #0b1220;
}
.hero-media {
  position: absolute;
  inset: 0;
  z-index: 0;
  background:
    url("/assets/hero-bg-ai.jpg") center/cover no-repeat,
    radial-gradient(900px 480px at 30% 40%, rgba(26, 154, 128, 0.55), transparent 60%),
    linear-gradient(135deg, #063d32 0%, #0d6b56 48%, #14221e 100%);
}
.hero-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  transform: scale(1.04);
  animation: heroDrift 18s ease-in-out infinite alternate;
}
.hero-veil {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(105deg, rgba(18, 16, 28, 0.82) 0%, rgba(24, 20, 36, 0.58) 48%, rgba(30, 24, 40, 0.28) 100%),
    linear-gradient(180deg, rgba(18, 16, 28, 0.28) 0%, transparent 32%, rgba(18, 16, 28, 0.72) 100%);
}
.hero-inner {
  position: relative;
  z-index: 1;
  max-width: 720px;
  animation: riseIn .9s ease both;
}
.hero-brand {
  font-family: var(--font-serif);
  font-size: clamp(2.4rem, 6vw, 3.8rem);
  font-weight: 700;
  letter-spacing: 0.12em;
  margin: 0 0 10px;
  color: #fff;
  text-shadow: 0 8px 40px rgba(0,0,0,.3);
}
.hero-eyebrow {
  display: inline-block;
  margin: 0 0 18px;
  padding: 6px 14px;
  border-radius: 999px;
  background: rgba(255, 140, 90, 0.16);
  border: 1px solid rgba(255, 170, 110, 0.35);
  color: #ffd4b0;
  font-size: 0.85rem;
}
.hero h1 {
  font-size: clamp(2rem, 4.5vw, 3.15rem);
  margin-bottom: 18px;
  color: #fff;
}
.hero-sub {
  color: rgba(255,255,255,.86);
  font-size: 1.05rem;
  max-width: 36em;
}
.hero-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 22px 0 28px;
}
.hero-tags li {
  padding: 7px 14px;
  border-radius: 999px;
  background: rgba(255,255,255,.1);
  border: 1px solid rgba(255,255,255,.2);
  color: #fff;
  font-size: 0.86rem;
}
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-bottom: 36px; }
.hero .btn-ghost {
  background: rgba(255,255,255,.12);
  border-color: rgba(255,255,255,.4);
  color: #fff;
  backdrop-filter: blur(6px);
}
.hero-stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
  max-width: 520px;
  margin: 0;
}
.hero-stats dt {
  font-family: var(--font-serif);
  font-size: 1.7rem;
  color: #ffb86b;
}
.hero-stats dd {
  margin: 0;
  font-size: 0.85rem;
  color: rgba(255,255,255,.72);
}

/* Stats band */
.stats-band {
  background: linear-gradient(90deg, var(--green-900), var(--green-700));
  color: #fff;
  padding: 36px 0;
}
.stats-grid {
  display: grid;
  grid-template-columns: repeat(8, minmax(0, 1fr));
  gap: 12px 8px;
  text-align: center;
}
.stat-item {
  min-width: 0;
}
.stat-item b {
  display: block;
  white-space: nowrap;
  font-family: var(--font-serif);
  /* 8 列桌面：保证「1828万+」不折行，字号仍明显大于原 1.35rem */
  font-size: clamp(1.4rem, 1.65vw, 2.05rem);
  line-height: 1.2;
  letter-spacing: 0;
  margin-bottom: 6px;
  color: var(--gold);
}
.stat-item .counter {
  font: inherit;
  color: inherit;
  opacity: 1;
}
/* Labels only — do not shrink the .counter number inside <b> */
.stat-item > span {
  display: block;
  font-size: 0.78rem;
  line-height: 1.35;
  opacity: .85;
}

/* Sections */
.section { padding: 96px 0; }
.section-mint { background: linear-gradient(180deg, var(--mint-50), #fff 70%); }
.section-deep {
  background:
    radial-gradient(700px 300px at 80% 0%, rgba(26,154,128,.25), transparent 60%),
    linear-gradient(160deg, #042820, #0a5444 55%, #063d32);
  color: #fff;
}
.section-deep p { color: rgba(255,255,255,.78); }

.sec-head { text-align: center; max-width: 760px; margin: 0 auto 48px; }
.sec-head h2 { font-size: clamp(1.7rem, 3vw, 2.35rem); color: var(--green-900); }
.sec-head-light h2 { color: #fff; }
.sec-tag {
  display: inline-block;
  margin-bottom: 14px;
  padding: 5px 14px;
  border-radius: 999px;
  background: var(--mint-100);
  color: var(--green-700);
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.06em;
}
.sec-head-light .sec-tag {
  background: rgba(255,255,255,.12);
  color: #d8f3ea;
}

.grid { display: grid; gap: 18px; }
.g2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.g3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.g4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.g5 { grid-template-columns: repeat(5, minmax(0, 1fr)); }

.panel {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: 0 8px 30px rgba(6, 61, 50, 0.04);
  transition: transform .25s, box-shadow .25s;
}
.panel:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow);
}
.panel h3, .panel h4 { color: var(--green-900); font-size: 1.1rem; }
.panel em {
  display: block;
  font-style: normal;
  font-family: var(--font-serif);
  color: var(--gold);
  margin-bottom: 8px;
}

.upgrade-banner {
  margin-top: 36px;
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 28px;
  align-items: center;
  padding: 28px 32px;
  border-radius: 22px;
  background: linear-gradient(120deg, var(--green-900), var(--green-700));
  color: #fff;
}
.upgrade-banner p { color: rgba(255,255,255,.82); margin: 0; }
.upgrade-label {
  display: inline-block;
  margin-bottom: 8px;
  font-size: 0.8rem;
  color: var(--gold);
  letter-spacing: 0.08em;
}
.upgrade-flow {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 14px;
  text-align: center;
  font-size: 0.95rem;
}
.upgrade-flow .arrow { color: var(--gold); font-size: 1.4rem; }
.upgrade-flow i { display: block; font-style: normal; opacity: .7; font-size: 0.8rem; margin-top: 4px; }
.upgrade-flow .to { color: #e8fff6; font-weight: 600; }

.formula {
  font-family: var(--font-serif);
  font-size: clamp(1rem, 2vw, 1.25rem);
  color: var(--green-800);
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 14px 18px;
  margin: 18px auto;
  display: inline-block;
}
.formula span { color: var(--gold); margin: 0 4px; }

.role {
  text-align: center;
  padding: 28px 18px;
  background: #fff;
  border-radius: var(--radius);
  border: 1px solid var(--line);
}
.role span {
  display: inline-flex;
  width: 52px;
  height: 52px;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: var(--mint-100);
  color: var(--green-800);
  font-family: var(--font-serif);
  font-size: 1.25rem;
  margin-bottom: 12px;
}
.role h3 { margin-bottom: 8px; color: var(--green-900); }

/* Architecture */
.arch-stack { display: grid; gap: 14px; }
.arch-layer {
  display: grid;
  grid-template-columns: 200px 1fr;
  background: #fff;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--line);
}
.arch-side {
  background: linear-gradient(160deg, var(--green-800), var(--green-900));
  color: #fff;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 24px 16px;
  text-align: center;
}
.arch-side b {
  font-family: var(--font-serif);
  font-size: 2.4rem;
  color: var(--gold);
  line-height: 1;
}
.arch-side span { font-size: 0.92rem; }
.arch-body { padding: 26px 28px; }
.arch-body h3 { color: var(--green-900); }
.chips { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 12px; }
.chips span {
  padding: 5px 12px;
  border-radius: 999px;
  background: var(--mint-100);
  color: var(--green-700);
  font-size: 0.82rem;
}

/* Models */
.model {
  background: rgba(255,255,255,.06);
  border: 1px solid rgba(255,255,255,.12);
  border-radius: var(--radius);
  padding: 22px 18px;
}
.model em {
  font-style: normal;
  font-family: var(--font-serif);
  color: var(--gold);
  font-size: 1.1rem;
}
.model h3 { color: #fff; font-size: 1.05rem; margin: 10px 0; }
.model p { margin: 0; font-size: 0.9rem; }
.cap-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  margin-top: 28px;
}
.cap-row div {
  padding: 18px;
  border-radius: 14px;
  background: rgba(255,255,255,.08);
  border: 1px solid rgba(255,255,255,.1);
}
.cap-row b { display: block; color: #fff; margin-bottom: 6px; }
.cap-row span { color: rgba(255,255,255,.7); font-size: 0.9rem; }

/* Loop */
.loop-steps {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 12px;
}
.loop-steps li {
  text-align: center;
  padding: 22px 12px;
  background: #fff;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  position: relative;
}
.loop-steps b {
  display: inline-flex;
  width: 36px;
  height: 36px;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: var(--green-800);
  color: #fff;
  margin-bottom: 10px;
}
.loop-steps h3 { font-size: 1rem; color: var(--green-900); margin-bottom: 6px; }
.loop-steps p { margin: 0; font-size: 0.86rem; }
.loop-value {
  margin-top: 28px;
  text-align: center;
  padding: 20px 24px;
  border-radius: 16px;
  background: var(--mint-100);
  color: var(--green-900);
}

/* Roles */
.roles-split {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 28px;
  align-items: center;
}
.phone-stack {
  display: flex;
  justify-content: center;
}
.phone-stack img {
  width: min(100%, 320px);
  border-radius: 28px;
  box-shadow: var(--shadow);
  animation: floatY 4.5s ease-in-out infinite;
}

/* Features */
.feature-block {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 36px;
  align-items: center;
  margin-bottom: 56px;
}
.feature-block.reverse { direction: rtl; }
.feature-block.reverse > * { direction: ltr; }
.kicker {
  display: inline-block;
  color: var(--green-600);
  font-weight: 600;
  font-size: 0.85rem;
  letter-spacing: 0.04em;
  margin-bottom: 8px;
}
.feature-copy h3 { color: var(--green-900); font-size: 1.55rem; }
.feature-copy ul { display: grid; gap: 12px; margin: 16px 0; }
.feature-copy li {
  padding-left: 14px;
  border-left: 3px solid var(--mint-200);
  color: var(--ink-soft);
}
.feature-copy li b { color: var(--green-800); margin-right: 6px; }
.kpi-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  margin-top: 18px;
}
.kpi-row div {
  background: var(--mint-50);
  border-radius: 12px;
  padding: 14px;
  text-align: center;
}
.kpi-row b {
  display: block;
  font-family: var(--font-serif);
  color: var(--green-800);
  font-size: 1.3rem;
}
.kpi-row span { font-size: 0.78rem; color: var(--ink-soft); }

.compare {
  display: grid;
  gap: 12px;
}
.compare-old, .compare-new {
  border-radius: var(--radius);
  padding: 22px;
}
.compare-old {
  background: #f7f2f0;
  border: 1px solid #eaded8;
}
.compare-new {
  background: linear-gradient(145deg, var(--mint-100), #fff);
  border: 1px solid var(--mint-200);
}
.compare span { font-size: 0.85rem; color: var(--ink-soft); }
.compare b {
  display: block;
  font-family: var(--font-serif);
  font-size: 2rem;
  margin: 6px 0 2px;
}
.compare-old b { color: #9a5b4a; }
.compare-new b { color: var(--green-800); }
.compare i { font-style: normal; font-size: 0.85rem; color: var(--ink-soft); }
.compare p { margin: 10px 0 0; font-size: 0.9rem; }

.feature-visual img {
  border-radius: 20px;
  box-shadow: var(--shadow);
}
.report-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 16px;
}
.report-tabs span {
  padding: 8px 12px;
  border-radius: 999px;
  background: var(--mint-100);
  color: var(--green-800);
  font-size: 0.84rem;
}
.report-mock {
  background: #fff;
  border-radius: 20px;
  padding: 22px;
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}
.rp-head {
  font-weight: 600;
  color: var(--green-900);
  margin-bottom: 18px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line);
}
.rp-row {
  display: flex;
  justify-content: space-between;
  margin: 12px 0 6px;
  font-size: 0.92rem;
}
.rp-row b { color: var(--green-700); }
.bar {
  height: 8px;
  background: var(--mint-100);
  border-radius: 999px;
  overflow: hidden;
  margin-bottom: 10px;
}
.bar i {
  display: block;
  height: 100%;
  background: linear-gradient(90deg, var(--green-500), var(--green-800));
  border-radius: inherit;
}

.ops-band {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 24px;
  align-items: center;
  padding: 28px;
  border-radius: 22px;
  background: linear-gradient(120deg, var(--green-900), var(--green-700));
  color: #fff;
}
.ops-band p { color: rgba(255,255,255,.8); margin: 0; }
.ops-band .kicker { color: var(--gold); }
.ops-band h3 { color: #fff; }
.ops-kpis {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  text-align: center;
}
.ops-kpis div {
  background: rgba(255,255,255,.08);
  border-radius: 14px;
  padding: 16px 10px;
}
.ops-kpis b {
  display: block;
  font-family: var(--font-serif);
  font-size: 1.4rem;
  color: var(--gold);
}

/* Hardware */
.hw-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 22px;
}
.hw {
  background: #fff;
  border-radius: 22px;
  overflow: hidden;
  border: 1px solid var(--line);
  box-shadow: 0 10px 36px rgba(6,61,50,.06);
}
.hw-media { position: relative; }
.hw-media img {
  width: 100%;
  height: 260px;
  object-fit: cover;
}
.hw-media span {
  position: absolute;
  left: 16px;
  bottom: 16px;
  padding: 6px 12px;
  border-radius: 999px;
  background: rgba(4, 40, 32, 0.78);
  color: #fff;
  font-size: 0.82rem;
}
.hw h3 { padding: 20px 22px 8px; color: var(--green-900); margin: 0; }
.hw ul { padding: 0 22px 24px; display: grid; gap: 10px; }
.hw li { color: var(--ink-soft); font-size: 0.92rem; }
.hw li b { color: var(--green-800); margin-right: 6px; }

/* About */
.about-intro {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 32px;
  align-items: center;
  margin-bottom: 36px;
}
.about-intro h3 { color: var(--green-900); font-size: 1.45rem; }
.about-media img {
  border-radius: 20px;
  width: 100%;
  height: 320px;
  object-fit: cover;
  box-shadow: var(--shadow);
}
.honors { margin-top: 40px; }
.honors h3 {
  text-align: center;
  color: var(--green-900);
  margin-bottom: 18px;
}
.honor-grid {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
  margin-bottom: 28px;
}
.honor-grid span {
  padding: 8px 14px;
  border-radius: 999px;
  background: var(--mint-50);
  border: 1px solid var(--mint-200);
  color: var(--green-800);
  font-size: 0.86rem;
}
.cert-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}
.cert-row img {
  width: 100%;
  height: 220px;
  object-fit: cover;
  border-radius: 16px;
  border: 1px solid var(--line);
  background: #fff;
}

/* Scale */
.scale-card {
  background: rgba(255,255,255,.07);
  border: 1px solid rgba(255,255,255,.12);
  border-radius: var(--radius);
  padding: 26px;
  text-align: center;
}
.scale-card b {
  display: block;
  font-family: var(--font-serif);
  font-size: 1.8rem;
  color: var(--gold);
  margin-bottom: 8px;
}
.scale-card span { color: rgba(255,255,255,.8); }
.effect { margin-top: 36px; }
.effect h3 { text-align: center; color: #fff; margin-bottom: 18px; }
.effect-grid > div {
  text-align: center;
  padding: 18px;
  border-radius: 14px;
  background: rgba(255,255,255,.08);
}
.effect-grid b {
  display: block;
  font-family: var(--font-serif);
  font-size: 1.6rem;
  color: var(--gold);
}
.effect-grid span { color: rgba(255,255,255,.75); font-size: 0.9rem; }

.win-tag {
  display: inline-block;
  margin-bottom: 10px;
  padding: 4px 12px;
  border-radius: 999px;
  background: var(--mint-100);
  color: var(--green-700);
  font-size: 0.8rem;
  font-weight: 600;
}
.benefit {
  margin-top: 28px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
}
.benefit-item {
  text-align: center;
  padding: 22px 12px;
  border-radius: var(--radius);
  background: var(--mint-50);
  border: 1px solid var(--mint-200);
}
.benefit-item b {
  display: block;
  font-family: var(--font-serif);
  font-size: 1.5rem;
  color: var(--green-800);
  margin-bottom: 6px;
}

/* Contact */
.contact-section {
  background:
    radial-gradient(900px 320px at 8% 0%, rgba(26, 154, 128, 0.1), transparent 55%),
    linear-gradient(180deg, #eef8f4 0%, var(--mint-50) 42%, #fff 100%);
}
.contact-shell {
  display: grid;
  grid-template-columns: minmax(280px, 0.82fr) minmax(0, 1.28fr);
  align-items: stretch;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 28px;
  overflow: hidden;
  box-shadow: var(--shadow);
}
.contact-aside {
  padding: 42px 36px;
  background:
    radial-gradient(420px 220px at 100% 0%, rgba(26, 154, 128, 0.28), transparent 70%),
    linear-gradient(165deg, #042820 0%, #0a5444 58%, #063d32 100%);
  color: #fff;
}
.contact-aside .sec-tag {
  background: rgba(255, 255, 255, 0.12);
  color: #d8f3ea;
  margin-bottom: 18px;
}
.contact-aside h2 {
  color: #fff;
  font-size: clamp(1.7rem, 2.4vw, 2.15rem);
  margin-bottom: 12px;
}
.contact-aside > p {
  color: rgba(255, 255, 255, 0.78);
  font-size: 0.95rem;
  margin-bottom: 28px;
}
.contact-flow {
  display: grid;
  gap: 14px;
  margin-bottom: 28px;
}
.contact-flow li {
  display: grid;
  grid-template-columns: 42px 1fr;
  gap: 12px;
  align-items: start;
}
.contact-flow b {
  width: 42px;
  height: 42px;
  border-radius: 12px;
  display: grid;
  place-items: center;
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.16);
  color: var(--gold);
  font-family: var(--font-serif);
  font-size: 0.92rem;
}
.contact-flow strong {
  display: block;
  font-size: 0.98rem;
  margin-bottom: 2px;
}
.contact-flow span {
  display: block;
  color: rgba(255, 255, 255, 0.62);
  font-size: 0.82rem;
}
.contact-facts {
  display: grid;
  gap: 14px;
  padding-top: 22px;
  border-top: 1px solid rgba(255, 255, 255, 0.12);
}
.contact-facts dt {
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: rgba(216, 243, 234, 0.7);
  margin-bottom: 4px;
}
.contact-facts dd {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.55;
  color: rgba(255, 255, 255, 0.92);
}
.contact-form {
  display: grid;
  gap: 22px;
  padding: 36px 40px 32px;
  background: #fff;
}
.form-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
  padding-bottom: 4px;
}
.form-head h3 {
  margin: 0;
  font-size: 1.15rem;
  color: var(--green-900);
}
.form-head p {
  margin: 0;
  font-size: 0.82rem;
}
.form-group {
  display: grid;
  gap: 12px;
}
.form-group-title {
  margin: 0;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--green-700);
}
.form-field { display: grid; gap: 8px; }
.form-field > span,
.form-group-title {
  display: flex;
  align-items: center;
  gap: 4px;
}
.form-field > span {
  font-size: 0.88rem;
  color: var(--ink);
  font-weight: 600;
}
.req {
  color: #c2410c;
  font-style: normal;
  font-weight: 700;
}
.contact-form input,
.contact-form textarea,
.contact-form select {
  width: 100%;
  padding: 12px 14px;
  border-radius: 12px;
  border: 1px solid var(--line);
  font: inherit;
  background: var(--mint-50);
  transition: border-color .2s, box-shadow .2s, background .2s;
  color: var(--ink);
}
.contact-form textarea {
  min-height: 120px;
  resize: vertical;
  line-height: 1.65;
}
.contact-form select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath fill='%230d6b56' d='M1 1l5 5 5-5'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 14px center;
  padding-right: 36px;
}
.contact-form input:focus,
.contact-form textarea:focus,
.contact-form select:focus {
  outline: none;
  border-color: var(--green-500);
  box-shadow: 0 0 0 3px rgba(26, 154, 128, 0.15);
  background: #fff;
}
.form-row-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.source-options {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 8px;
}
.source-chip {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  padding: 8px 10px;
  border-radius: 12px;
  background: var(--mint-50);
  border: 1px solid var(--line);
  font-size: 0.86rem;
  color: var(--ink-soft);
  cursor: pointer;
  text-align: center;
  transition: border-color .2s, color .2s, background .2s, box-shadow .2s;
}
.source-chip input {
  position: absolute;
  opacity: 0;
  pointer-events: none;
  width: 1px;
  height: 1px;
}
.source-chip.is-on,
.source-chip:has(input:checked) {
  border-color: var(--green-600);
  color: var(--green-800);
  background: var(--mint-100);
  box-shadow: 0 0 0 3px rgba(26, 154, 128, 0.12);
  font-weight: 600;
}
.source-chip:focus-within {
  border-color: var(--green-500);
  box-shadow: 0 0 0 3px rgba(26, 154, 128, 0.15);
}
.source-chip input:focus {
  outline: none;
  box-shadow: none;
  background: transparent;
}
.source-custom.is-hidden { display: none; }
.form-submit {
  display: grid;
  justify-items: start;
  gap: 10px;
  padding-top: 6px;
  border-top: 1px solid var(--line);
}
.form-submit .btn { min-width: 180px; }
.btn:disabled { opacity: .65; cursor: not-allowed; transform: none; }
.form-tip { margin: 0; font-size: 0.82rem; line-height: 1.6; max-width: 36em; }
.form-tip.is-ok { color: var(--green-700); font-weight: 600; }
.form-tip.is-err { color: #b42318; font-weight: 600; }

/* Product demo */
.page-demo .demo-hero { padding-top: 96px; padding-bottom: 36px; }
.demo-role-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 22px;
}
.demo-role-card {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 28px 24px 22px;
  border-radius: var(--radius);
  background: #fff;
  border: 1px solid var(--line);
  box-shadow: 0 10px 32px rgba(6, 61, 50, 0.06);
  transition: transform .25s, box-shadow .25s, border-color .25s;
  min-height: 280px;
}
.demo-role-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow);
  border-color: rgba(13, 107, 86, 0.35);
}
.demo-role-icon {
  width: 52px;
  height: 52px;
  border-radius: 16px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1.25rem;
  color: #fff;
  background: linear-gradient(135deg, var(--green-700), var(--green-500));
}
.demo-role-card.role-teacher .demo-role-icon {
  background: linear-gradient(135deg, #0a5444, #d4a84b);
}
.demo-role-card.role-parent .demo-role-icon {
  background: linear-gradient(135deg, #12806a, #063d32);
}
.demo-role-card h2 {
  margin: 0;
  color: var(--green-900);
  font-size: 1.45rem;
}
.demo-role-card p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 0.95rem;
  flex: 1;
}
.demo-role-meta {
  font-size: 0.82rem;
  color: var(--green-600);
  font-weight: 600;
}
.demo-role-cta {
  color: var(--green-700);
  font-weight: 700;
}
.demo-role-switch {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 22px;
}
.demo-role-switch a {
  padding: 8px 14px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: #fff;
  color: var(--ink-soft);
  font-size: 0.9rem;
}
.demo-role-switch a.on,
.demo-role-switch a:hover {
  background: var(--green-700);
  border-color: var(--green-700);
  color: #fff;
}
.demo-video-list {
  display: grid;
  gap: 16px;
  max-width: 920px;
}
.demo-block { display: grid; gap: 16px; }
.demo-block-title {
  margin: 0 0 4px;
  font-size: 1.15rem;
  color: var(--green-900);
}
.demo-split {
  display: flex;
  align-items: center;
  gap: 14px;
  margin: 18px 0 6px;
  color: var(--green-700);
  font-weight: 700;
  font-size: 0.95rem;
}
.demo-split::before,
.demo-split::after {
  content: "";
  flex: 1;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--line), transparent);
}
.demo-split::before { background: linear-gradient(90deg, transparent, var(--line)); }
.demo-split::after { background: linear-gradient(90deg, var(--line), transparent); }
.demo-item {
  display: grid;
  grid-template-columns: 240px minmax(0, 1fr);
  align-items: stretch;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: 0 8px 28px rgba(6, 61, 50, 0.05);
  transition: transform .22s, box-shadow .22s, border-color .22s;
  color: inherit;
}
.demo-item.is-clip {
  grid-template-columns: 200px minmax(0, 1fr);
}
.demo-item:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow);
  border-color: rgba(13, 107, 86, 0.35);
}
.demo-item-cover {
  position: relative;
  display: block;
  min-height: 132px;
  background: #031f19;
  overflow: hidden;
}
.demo-item-cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  aspect-ratio: 16 / 9;
}
.demo-item-fallback {
  display: block;
  width: 100%;
  height: 100%;
  min-height: 132px;
  background:
    radial-gradient(circle at 30% 20%, rgba(255,255,255,.12), transparent 45%),
    linear-gradient(135deg, #0a5444, #063d32 60%, #d4a84b);
}
.demo-item-play {
  position: absolute;
  left: 50%;
  top: 50%;
  width: 44px;
  height: 44px;
  margin: -22px 0 0 -22px;
  border-radius: 50%;
  background: rgba(255,255,255,.92);
  box-shadow: 0 6px 18px rgba(0,0,0,.25);
}
.demo-item-play::after {
  content: "";
  position: absolute;
  left: 17px;
  top: 14px;
  border-style: solid;
  border-width: 8px 0 8px 12px;
  border-color: transparent transparent transparent var(--green-700);
}
.demo-item-body {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 8px;
  padding: 18px 22px;
}
.demo-item-tag {
  align-self: flex-start;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--green-700);
  background: var(--mint-100);
  padding: 2px 8px;
  border-radius: 999px;
}
.demo-item-body h2 {
  margin: 0;
  font-size: 1.2rem;
  color: var(--green-900);
}
.demo-item-body p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 0.92rem;
}
.demo-item-cta {
  color: var(--green-700);
  font-weight: 700;
  font-size: 0.9rem;
}
.demo-video-card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: 0 8px 28px rgba(6, 61, 50, 0.05);
}
.demo-video-player {
  background: #031f19;
  aspect-ratio: 16 / 9;
}
.demo-video-player video {
  display: block;
  width: 100%;
  height: 100%;
  background: #000;
}
.demo-play-wrap { max-width: 920px; }
.demo-play-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 18px;
}
.demo-empty {
  padding: 36px 28px;
  text-align: center;
}
.demo-empty h2 { color: var(--green-900); margin-top: 0; }

/* News */
.news-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}
.news-card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: 0 8px 30px rgba(6, 61, 50, 0.04);
  transition: transform .25s, box-shadow .25s;
}
.news-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow);
}
.news-card-link {
  display: block;
  padding: 24px;
  height: 100%;
}
.news-card h2,
.news-card h3 {
  color: var(--green-900);
  font-size: 1.15rem;
  margin: 10px 0 12px;
}
.news-card p {
  font-size: 0.92rem;
  margin-bottom: 16px;
}
.news-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  font-size: 0.8rem;
  color: var(--green-600);
}
.news-meta span {
  padding: 2px 8px;
  border-radius: 999px;
  background: var(--mint-100);
}
.news-more {
  color: var(--green-700);
  font-weight: 600;
  font-size: 0.9rem;
}
.news-actions {
  text-align: center;
  margin-top: 32px;
}

.page-news .news-list-hero,
.page-article main {
  padding-top: 96px;
}
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  margin-bottom: 18px;
  font-size: 0.88rem;
  color: var(--ink-soft);
}
.breadcrumb a { color: var(--green-700); }
.article {
  max-width: 760px;
  padding-bottom: 72px;
}
.article-head h1 {
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  color: var(--green-900);
  margin: 12px 0 14px;
}
.article-lead {
  font-size: 1.05rem;
  color: var(--ink-soft);
  border-left: 3px solid var(--mint-200);
  padding-left: 14px;
}
.article-body h2 {
  margin-top: 1.6em;
  color: var(--green-900);
  font-size: 1.25rem;
}
.article-body p,
.article-body li { line-height: 1.85; }
.article-body ol,
.article-body ul {
  margin: 0 0 1em;
  padding-left: 1.2em;
  list-style: disc;
}
.article-body ol { list-style: decimal; }
.article-body li { margin-bottom: 0.45em; color: var(--ink-soft); }
.article-cta {
  margin-top: 36px;
  padding: 22px;
  border-radius: 16px;
  background: var(--mint-50);
  border: 1px solid var(--mint-200);
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
}
.article-cta p {
  flex: 1 1 100%;
  margin: 0 0 4px;
  color: var(--green-900);
  font-weight: 600;
}
.article-cta .btn-ghost {
  background: #fff;
  border-color: var(--green-700);
  color: var(--green-800);
}

@media (max-width: 900px) {
  .news-grid { grid-template-columns: 1fr; }
}

/* Footer */
.site-footer {
  background: #031f19;
  color: rgba(255,255,255,.78);
  padding: 56px 0 28px;
}
.footer-inner {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 28px;
  margin-bottom: 36px;
}
.footer-brand .brand-text strong { color: #fff; }
.footer-brand .brand-text em { color: rgba(255,255,255,.55); }
.footer-brand p { margin-top: 14px; color: rgba(255,255,255,.65); font-size: 0.9rem; }
.footer-col { display: grid; gap: 10px; align-content: start; }
.footer-col h4 { color: #fff; margin: 0 0 6px; font-size: 1rem; }
.footer-col a { color: rgba(255,255,255,.68); font-size: 0.9rem; }
.footer-col a:hover { color: var(--gold); }
.footer-bottom {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  padding-top: 20px;
  border-top: 1px solid rgba(255,255,255,.1);
  font-size: 0.85rem;
}
.footer-bottom a { color: var(--gold); }

.back-top {
  position: fixed;
  right: 22px;
  bottom: 22px;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: 0;
  background: var(--green-800);
  color: #fff;
  font-size: 1.1rem;
  cursor: pointer;
  opacity: 0;
  pointer-events: none;
  transform: translateY(10px);
  transition: .25s;
  z-index: 90;
  box-shadow: 0 8px 24px rgba(6,61,50,.3);
}
.back-top.is-show {
  opacity: 1;
  pointer-events: auto;
  transform: none;
}

/* Motion */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity .7s ease, transform .7s ease;
}
.reveal.is-in {
  opacity: 1;
  transform: none;
}

@keyframes riseIn {
  from { opacity: 0; transform: translateY(28px); }
  to { opacity: 1; transform: none; }
}
@keyframes heroDrift {
  from { transform: scale(1.04) translateY(0); }
  to { transform: scale(1.1) translateY(-2%); }
}
@keyframes floatY {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

/* Responsive */
@media (max-width: 1100px) {
  .stats-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 22px 12px;
  }
  .stat-item b { font-size: clamp(1.8rem, 3.4vw, 2.4rem); }
  .stat-item > span { font-size: 0.82rem; }
  .g5 { grid-template-columns: repeat(3, 1fr); }
  .g4 { grid-template-columns: repeat(2, 1fr); }
  .loop-steps { grid-template-columns: repeat(3, 1fr); }
  .footer-inner { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 900px) {
  .nav-toggle { display: block; }
  .main-nav {
    position: fixed;
    inset: 72px 16px auto;
    display: none;
    flex-direction: column;
    align-items: stretch;
    padding: 14px;
    background: #fff;
    border-radius: 16px;
    box-shadow: var(--shadow);
  }
  .main-nav.is-open { display: flex; }
  .main-nav a { color: var(--ink) !important; }
  .nav-cta { margin: 8px 0 0 !important; text-align: center; }
  .site-header { background: rgba(255,255,255,.95); }

  .hero { align-items: center; padding-top: 100px; }
  .hero-stats { grid-template-columns: 1fr; max-width: 240px; }
  .g3, .g2, .cap-row, .roles-split, .feature-block,
  .feature-block.reverse, .about-intro, .hw-grid,
  .contact-shell, .upgrade-banner, .ops-band,
  .arch-layer, .cert-row, .benefit, .demo-role-grid {
    grid-template-columns: 1fr;
    direction: ltr;
  }
  .demo-item,
  .demo-item.is-clip {
    grid-template-columns: 1fr;
  }
  .contact-aside { padding: 32px 24px 28px; }
  .contact-form { padding: 28px 24px 24px; }
  .source-options { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .feature-block { margin-bottom: 40px; }
  .loop-steps { grid-template-columns: repeat(2, 1fr); }
  .g5 { grid-template-columns: 1fr 1fr; }
  .arch-side { flex-direction: row; gap: 12px; padding: 16px; }
  .arch-side b { font-size: 1.6rem; }
}

@media (max-width: 560px) {
  .container { width: min(100% - 28px, var(--container)); }
  .section { padding: 72px 0; }
  .stats-band { padding: 28px 0; }
  .stats-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 20px 10px;
  }
  .stat-item b { font-size: clamp(1.65rem, 6.5vw, 2.1rem); }
  .stat-item > span { font-size: 0.78rem; }
  .g4, .g5, .loop-steps, .ops-kpis, .kpi-row { grid-template-columns: 1fr; }
  .hero-actions { flex-direction: column; align-items: stretch; }
  .form-row-2 { grid-template-columns: 1fr; }
  .form-head { flex-direction: column; align-items: flex-start; }
  .form-submit .btn { width: 100%; }
  .footer-inner { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; }
  .hero-brand { letter-spacing: 0.06em; }
}