/* 几木学官网 — jmxt.com.cn */

:root {
  --blue: #165dff;
  --blue-dark: #0e42d2;
  --blue-soft: #e8f3ff;
  --blue-glow: rgba(22, 93, 255, 0.15);
  --orange: #ff7d00;
  --green: #00b578;
  --text: #1d2129;
  --text-2: #4e5969;
  --text-3: #86909c;
  --bg: #f7f8fa;
  --white: #ffffff;
  --border: #e5e6eb;
  --shadow: 0 12px 40px rgba(22, 93, 255, 0.1);
  --shadow-hover: 0 20px 48px rgba(22, 93, 255, 0.16);
  --radius: 20px;
  --max: 1140px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --header-h: 72px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  padding-top: var(--header-h);
  font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  color: var(--text);
  background: var(--white);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

a {
  color: var(--blue);
  text-decoration: none;
  transition: color 0.2s var(--ease);
}

a:hover {
  color: var(--blue-dark);
}

img,
svg {
  display: block;
  max-width: 100%;
}

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

/* ── Animations ── */
@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(28px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

@keyframes pulseGlow {
  0%, 100% { opacity: 0.45; transform: scale(1); }
  50% { opacity: 0.75; transform: scale(1.05); }
}

@keyframes shimmer {
  0% { background-position: 200% center; }
  100% { background-position: -200% center; }
}

.reveal {
  opacity: 0;
  transform: translateY(32px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.reveal-delay-1 { transition-delay: 0.08s; }
.reveal-delay-2 { transition-delay: 0.16s; }
.reveal-delay-3 { transition-delay: 0.24s; }
.reveal-delay-4 { transition-delay: 0.32s; }

.hero-content {
  animation: fadeUp 0.9s var(--ease) both;
}

.hero-visual {
  animation: fadeUp 0.9s var(--ease) 0.15s both;
}

@media (prefers-reduced-motion: reduce) {
  .reveal,
  .hero-content,
  .hero-visual,
  .hero-glow,
  .flow-steps li {
    animation: none !important;
    transition: none !important;
    opacity: 1 !important;
    transform: none !important;
  }
}

/* ── Header ── */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 200;
  background: transparent;
  backdrop-filter: none;
  border-bottom: 1px solid transparent;
  box-shadow: none;
  transition:
    background 0.4s var(--ease),
    backdrop-filter 0.4s var(--ease),
    border-color 0.4s var(--ease),
    box-shadow 0.4s var(--ease);
}

.site-header.is-scrolled {
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(20px) saturate(1.3);
  border-bottom-color: rgba(229, 230, 235, 0.9);
  box-shadow: 0 4px 24px rgba(29, 33, 41, 0.08), 0 1px 0 rgba(255, 255, 255, 0.8) inset;
}

.header-inner {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: var(--header-h);
  gap: 20px;
  transition: min-height 0.35s var(--ease), padding 0.35s var(--ease);
}

.site-header.is-scrolled .header-inner {
  min-height: 60px;
}

.brand {
  display: flex;
  align-items: center;
  flex-shrink: 0;
  color: var(--text);
  transition: transform 0.35s var(--ease);
}

.site-header.is-scrolled .brand {
  transform: scale(0.94);
  transform-origin: left center;
}

.brand-logo {
  display: block;
  height: 36px;
  width: auto;
  flex-shrink: 0;
  transition: height 0.35s var(--ease);
}

.site-header.is-scrolled .brand-logo {
  height: 32px;
}

.nav-toggle {
  display: none;
  width: 40px;
  height: 40px;
  border: 1px solid transparent;
  border-radius: 10px;
  background: transparent;
  cursor: pointer;
  padding: 0;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 5px;
  transition: background 0.3s, border-color 0.3s;
}

.site-header.is-scrolled .nav-toggle {
  border-color: var(--border);
  background: var(--white);
}

.nav-toggle span {
  display: block;
  width: 18px;
  height: 2px;
  background: var(--text);
  border-radius: 1px;
  transition: transform 0.25s var(--ease), opacity 0.25s;
}

.nav-toggle.is-open span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle.is-open span:nth-child(2) {
  opacity: 0;
}

.nav-toggle.is-open span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

.nav {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 4px;
  border-radius: 14px;
  border: 1px solid transparent;
  background: transparent;
  transition:
    background 0.4s var(--ease),
    border-color 0.4s var(--ease),
    box-shadow 0.4s var(--ease),
    gap 0.35s var(--ease);
}

.site-header.is-scrolled .nav {
  gap: 2px;
  background: rgba(247, 248, 250, 0.95);
  border-color: var(--border);
  box-shadow: 0 2px 12px rgba(29, 33, 41, 0.04);
}

.nav a {
  position: relative;
  padding: 8px 14px;
  border-radius: 10px;
  color: var(--text-2);
  font-size: 0.9375rem;
  font-weight: 500;
  transition: background 0.25s var(--ease), color 0.25s var(--ease), font-size 0.35s var(--ease);
}

.site-header:not(.is-scrolled) .nav a {
  color: var(--text);
}

.site-header.is-scrolled .nav a {
  font-size: 0.875rem;
  padding: 7px 12px;
}

.nav a:hover {
  background: var(--blue-soft);
  color: var(--blue);
}

.nav a.is-active {
  background: var(--white);
  color: var(--blue);
  font-weight: 600;
  box-shadow: 0 1px 4px rgba(22, 93, 255, 0.12);
}

.site-header:not(.is-scrolled) .nav a.is-active {
  background: rgba(255, 255, 255, 0.75);
}

.nav-cta {
  margin-left: 6px;
  padding: 8px 18px !important;
  background: linear-gradient(135deg, var(--blue), #4080ff) !important;
  color: var(--white) !important;
  border-radius: 10px !important;
  box-shadow: 0 4px 14px rgba(22, 93, 255, 0.3);
  transition: box-shadow 0.35s var(--ease), transform 0.25s var(--ease), padding 0.35s var(--ease) !important;
}

.site-header.is-scrolled .nav-cta {
  padding: 7px 16px !important;
  box-shadow: 0 6px 18px rgba(22, 93, 255, 0.35);
}

.nav-cta:hover {
  background: linear-gradient(135deg, var(--blue-dark), var(--blue)) !important;
  color: var(--white) !important;
  transform: translateY(-1px);
}

.nav-cta.is-active {
  background: linear-gradient(135deg, var(--blue-dark), var(--blue)) !important;
  color: var(--white) !important;
  box-shadow: 0 6px 18px rgba(22, 93, 255, 0.4);
}

/* ── Hero ── */
.hero {
  position: relative;
  padding: 40px 0 96px;
  overflow: hidden;
  margin-top: calc(-1 * var(--header-h));
  padding-top: calc(40px + var(--header-h));
}

.hero-bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(ellipse 70% 55% at 15% 0%, rgba(22, 93, 255, 0.12), transparent 60%),
    radial-gradient(ellipse 50% 40% at 85% 10%, rgba(0, 181, 120, 0.08), transparent 55%),
    radial-gradient(ellipse 40% 30% at 60% 80%, rgba(255, 125, 0, 0.06), transparent 50%),
    linear-gradient(180deg, #f8faff 0%, #ffffff 70%);
}

.hero-glow {
  position: absolute;
  top: 10%;
  right: 8%;
  width: 320px;
  height: 320px;
  border-radius: 50%;
  background: radial-gradient(circle, var(--blue-glow), transparent 70%);
  animation: pulseGlow 6s ease-in-out infinite;
}

.hero-grid {
  position: relative;
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 56px;
  align-items: center;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 20px;
  padding: 7px 16px;
  border-radius: 999px;
  background: linear-gradient(135deg, var(--blue-soft), #f0f7ff);
  border: 1px solid rgba(22, 93, 255, 0.12);
  color: var(--blue);
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.02em;
}

.eyebrow-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 0 3px rgba(0, 181, 120, 0.2);
}

.hero h1 {
  margin: 0 0 12px;
  font-size: clamp(2.5rem, 5vw, 3.75rem);
  line-height: 1.12;
  letter-spacing: -0.03em;
  font-weight: 800;
  background: linear-gradient(135deg, var(--text) 30%, var(--blue) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero .tagline {
  margin: 0 0 16px;
  font-size: clamp(1.125rem, 2vw, 1.375rem);
  color: var(--blue);
  font-weight: 700;
  letter-spacing: 0.01em;
}

.hero-keywords {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 20px;
}

.keyword-pill {
  display: inline-flex;
  align-items: center;
  padding: 6px 14px;
  border-radius: 999px;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--blue);
  background: linear-gradient(135deg, rgba(22, 93, 255, 0.1), rgba(0, 181, 120, 0.08));
  border: 1px solid rgba(22, 93, 255, 0.15);
  box-shadow: 0 2px 8px rgba(22, 93, 255, 0.06);
}

.hero .lead {
  margin: 0 0 36px;
  font-size: 1.0625rem;
  color: var(--text-2);
  max-width: 34em;
  line-height: 1.75;
}

.hero .lead strong {
  color: var(--text);
  font-weight: 700;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 28px;
  border-radius: 12px;
  font-size: 0.9375rem;
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition: transform 0.25s var(--ease), box-shadow 0.25s var(--ease), background 0.25s;
}

.btn:hover {
  transform: translateY(-2px);
}

.btn:active {
  transform: translateY(0);
}

.btn-primary {
  background: linear-gradient(135deg, var(--blue), #4080ff);
  color: var(--white);
  box-shadow: 0 8px 24px rgba(22, 93, 255, 0.35);
}

.btn-primary:hover {
  color: var(--white);
  box-shadow: 0 12px 32px rgba(22, 93, 255, 0.42);
}

.btn-ghost {
  background: rgba(255, 255, 255, 0.9);
  color: var(--text);
  border: 1px solid var(--border);
  backdrop-filter: blur(4px);
}

.btn-ghost:hover {
  border-color: var(--blue);
  color: var(--blue);
}

/* Hero card */
.hero-card {
  position: relative;
  background: rgba(255, 255, 255, 0.85);
  border: 1px solid rgba(255, 255, 255, 0.8);
  border-radius: 24px;
  padding: 32px 28px;
  box-shadow: var(--shadow);
  backdrop-filter: blur(12px);
  animation: float 5s ease-in-out infinite;
}

.hero-card::before {
  content: "";
  position: absolute;
  inset: -1px;
  border-radius: 24px;
  padding: 1px;
  background: linear-gradient(135deg, rgba(22, 93, 255, 0.25), rgba(0, 181, 120, 0.15), transparent);
  -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  pointer-events: none;
}

.hero-card-title {
  margin: 0 0 20px;
  font-size: 0.8125rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-3);
}

.flow-steps {
  display: flex;
  flex-direction: column;
  gap: 0;
  margin: 0;
  padding: 0;
  list-style: none;
}

.flow-steps li {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  padding: 16px 0;
  border-bottom: 1px dashed var(--border);
  transition: transform 0.3s var(--ease);
}

.flow-steps li:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.flow-steps li:hover {
  transform: translateX(4px);
}

.step-num {
  flex-shrink: 0;
  width: 36px;
  height: 36px;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--blue-soft), #f0f7ff);
  color: var(--blue);
  font-weight: 800;
  font-size: 0.875rem;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: inset 0 0 0 1px rgba(22, 93, 255, 0.1);
}

.step-body strong {
  display: block;
  margin-bottom: 4px;
  font-size: 1rem;
}

.step-body span {
  font-size: 0.875rem;
  color: var(--text-2);
  line-height: 1.5;
}

/* ── Sections ── */
section {
  padding: 88px 0;
}

section.alt-bg {
  background: var(--bg);
}

.section-head {
  text-align: center;
  max-width: 620px;
  margin: 0 auto 56px;
}

.section-label {
  display: inline-block;
  margin-bottom: 12px;
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--blue);
}

.section-head h2 {
  margin: 0 0 14px;
  font-size: clamp(1.625rem, 3vw, 2.25rem);
  font-weight: 800;
  letter-spacing: -0.02em;
}

.section-head p {
  margin: 0;
  color: var(--text-2);
  font-size: 1.0625rem;
}

.cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.cards-4 {
  grid-template-columns: repeat(4, 1fr);
}

.card {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px 28px;
  transition: transform 0.35s var(--ease), box-shadow 0.35s var(--ease), border-color 0.35s;
}

.card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-hover);
  border-color: rgba(22, 93, 255, 0.15);
}

.card-icon {
  width: 52px;
  height: 52px;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
}

.card-icon svg {
  width: 26px;
  height: 26px;
}

.card-icon.blue {
  background: linear-gradient(135deg, var(--blue-soft), #dceaff);
  color: var(--blue);
}

.card-icon.orange {
  background: linear-gradient(135deg, #fff7e8, #ffe8cc);
  color: var(--orange);
}

.card-icon.green {
  background: linear-gradient(135deg, #e8fff3, #c8f7df);
  color: var(--green);
}

.card-icon.purple {
  background: linear-gradient(135deg, #f0ebff, #e0d4ff);
  color: #722ed1;
}

.card h3 {
  margin: 0 0 10px;
  font-size: 1.1875rem;
  font-weight: 700;
}

.card p {
  margin: 0;
  color: var(--text-2);
  font-size: 0.9375rem;
  line-height: 1.7;
}

.two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px;
}

.audience-panel {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 36px 32px;
  transition: transform 0.35s var(--ease), box-shadow 0.35s var(--ease);
}

.audience-panel:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow);
}

.audience-badge {
  display: inline-block;
  margin-bottom: 12px;
  padding: 4px 12px;
  border-radius: 6px;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.04em;
}

.audience-badge.parent {
  background: var(--blue-soft);
  color: var(--blue);
}

.audience-badge.org {
  background: #e8fff3;
  color: var(--green);
}

.audience-panel h3 {
  margin: 0 0 6px;
  font-size: 1.375rem;
  font-weight: 800;
}

.audience-panel .subtitle {
  margin: 0 0 22px;
  color: var(--text-3);
  font-size: 0.9375rem;
}

.audience-panel ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

.audience-panel li {
  position: relative;
  padding-left: 22px;
  margin-bottom: 12px;
  color: var(--text-2);
  font-size: 0.9375rem;
}

.audience-panel li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--blue);
  opacity: 0.55;
}

.about-box {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 40px 44px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.03);
}

.about-box dl {
  display: grid;
  grid-template-columns: 130px 1fr;
  gap: 16px 28px;
  margin: 0;
}

.about-box dt {
  color: var(--text-3);
  font-weight: 600;
  font-size: 0.9375rem;
}

.about-box dd {
  margin: 0;
  color: var(--text);
  font-size: 0.9375rem;
}

/* Contact */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-bottom: 28px;
}

.contact-card {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 24px;
  text-align: center;
  transition: transform 0.35s var(--ease), box-shadow 0.35s var(--ease);
}

.contact-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow);
}

.contact-icon {
  width: 48px;
  height: 48px;
  margin: 0 auto 16px;
  border-radius: 14px;
  background: var(--blue-soft);
  color: var(--blue);
  display: flex;
  align-items: center;
  justify-content: center;
}

.contact-icon svg {
  width: 22px;
  height: 22px;
}

.contact-card h3 {
  margin: 0 0 8px;
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--text-3);
}

.contact-value {
  margin: 0 0 10px;
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--text);
  word-break: break-all;
}

.contact-value a {
  color: var(--text);
}

.contact-value a:hover {
  color: var(--blue);
}

.contact-action {
  display: inline-block;
  padding: 6px 14px;
  border-radius: 8px;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--blue);
  background: var(--blue-soft);
  border: none;
  cursor: pointer;
  transition: background 0.2s;
}

.contact-action:hover {
  background: #dceaff;
}

.contact-extra {
  text-align: center;
  padding: 20px;
  border-radius: 12px;
  background: rgba(22, 93, 255, 0.04);
  border: 1px dashed rgba(22, 93, 255, 0.15);
  color: var(--text-2);
  font-size: 0.9375rem;
}

.contact-extra a {
  font-weight: 600;
}

/* Footer */
.site-footer {
  background: linear-gradient(180deg, #141a22 0%, #0c1017 100%);
  color: #c9cdd4;
  padding: 56px 0 36px;
  font-size: 0.875rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.3fr 1fr;
  gap: 48px;
  margin-bottom: 36px;
}

.footer-brand-row {
  margin-bottom: 14px;
}

.footer-brand {
  color: var(--white);
  font-size: 1.125rem;
  font-weight: 700;
}

.footer-desc {
  margin: 0;
  line-height: 1.75;
  max-width: 30em;
  color: #9aa3b0;
}

.footer-meta p {
  margin: 0 0 8px;
  color: #9aa3b0;
}

.footer-bottom {
  padding-top: 28px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  text-align: center;
  line-height: 1.85;
  color: #7a8494;
}

.footer-bottom .icp {
  margin-top: 10px;
}

.footer-bottom .icp a {
  color: #94bfff;
  transition: color 0.2s;
}

.footer-bottom .icp a:hover {
  color: #bedaff;
}

.footer-bottom .beian-note {
  margin: 8px 0 0;
  font-size: 13px;
  color: #94bfff;
}

.footer-bottom .beian-note a {
  color: #94bfff;
  text-decoration: underline;
}

.footer-bottom .beian-note a:hover {
  color: #bedaff;
}

/* Responsive */
@media (max-width: 960px) {
  .hero-grid,
  .cards,
  .cards-4,
  .two-col,
  .contact-grid,
  .footer-grid {
    grid-template-columns: 1fr;
  }

  .nav-toggle {
    display: flex;
  }

  .nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    padding: 12px 16px 16px;
    background: rgba(255, 255, 255, 0.98);
    border-bottom: 1px solid var(--border);
    border-radius: 0;
    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.1);
    backdrop-filter: blur(20px);
  }

  .site-header:not(.is-scrolled) .nav.is-open {
    background: rgba(255, 255, 255, 0.97);
  }

  .nav.is-open {
    display: flex;
  }

  .nav a {
    padding: 12px 14px;
    font-size: 0.9375rem !important;
  }

  .site-header.is-scrolled .nav a {
    padding: 12px 14px;
  }

  .nav-cta {
    margin-left: 0 !important;
    text-align: center;
  }

  .hero {
    padding-top: calc(32px + var(--header-h));
  }

  .hero-card {
    animation: none;
  }

  .about-box dl {
    grid-template-columns: 1fr;
    gap: 4px;
  }

  .about-box dt {
    margin-top: 14px;
  }
}