:root {
  --green-900: #0b3d2e;
  --green-800: #125c44;
  --green-700: #1a7a58;
  --green-600: #228f66;
  --green-500: #2ea875;
  --green-400: #4ec48f;
  --green-200: #b8e6cf;
  --ink: #12352a;
  --ink-soft: #3d5f52;
  --ink-muted: #6a8a7c;
  --surface: #f4faf7;
  --surface-2: #e8f4ee;
  --white: #ffffff;
  --line: rgba(18, 92, 68, 0.14);
  --rail-w: 88px;
  --transition: 0.4s cubic-bezier(0.22, 1, 0.36, 1);
  --font-display: 'Noto Serif SC', 'Songti SC', serif;
  --font-body: 'Outfit', 'Noto Serif SC', system-ui, sans-serif;
}

*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  background: var(--surface);
  color: var(--ink);
  line-height: 1.7;
  overflow-x: hidden;
}

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

ul {
  list-style: none;
}

/* —— 左侧轨道导航（与顶栏导航完全不同） —— */
.rail {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  width: var(--rail-w);
  z-index: 1000;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 28px 0;
  background: var(--green-900);
  color: var(--white);
}

.rail-logo {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 1.1rem;
  letter-spacing: 0.12em;
  writing-mode: vertical-rl;
  text-orientation: mixed;
  margin-bottom: 40px;
}

.rail-nav {
  display: flex;
  flex-direction: column;
  gap: 22px;
  flex: 1;
  align-items: center;
}

.rail-nav a {
  writing-mode: vertical-rl;
  font-size: 0.78rem;
  letter-spacing: 0.18em;
  color: rgba(255, 255, 255, 0.45);
  transition: color var(--transition);
}

.rail-nav a:hover,
.rail-nav a.active {
  color: var(--green-200);
}

.rail-mail {
  font-size: 1.1rem;
  color: var(--green-400);
  transition: transform var(--transition);
}

.rail-mail:hover {
  transform: scale(1.15);
}

.menu-toggle {
  display: none;
  position: fixed;
  top: 18px;
  right: 18px;
  z-index: 1100;
  flex-direction: column;
  gap: 5px;
  background: var(--green-900);
  border: none;
  border-radius: 6px;
  padding: 10px;
  cursor: pointer;
}

.menu-toggle span {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--white);
  transition: var(--transition);
}

.page {
  margin-left: var(--rail-w);
}

/* —— 首屏：左右对切 —— */
.hero {
  display: grid;
  grid-template-columns: 1fr 1fr;
  min-height: 100vh;
}

.hero-pane {
  position: relative;
  min-height: 100vh;
}

.hero-pane-copy {
  display: flex;
  align-items: center;
  padding: 80px 48px 80px 56px;
  background:
    linear-gradient(165deg, #eaf7f0 0%, var(--surface) 55%, #dff2e8 100%);
  overflow: hidden;
}

.hero-brand-vertical {
  position: absolute;
  left: 20px;
  top: 50%;
  transform: translateY(-50%);
  writing-mode: vertical-rl;
  font-family: var(--font-display);
  font-size: 0.75rem;
  letter-spacing: 0.45em;
  color: rgba(18, 92, 68, 0.28);
  pointer-events: none;
}

.hero-copy {
  max-width: 420px;
  position: relative;
  z-index: 1;
}

.hero-brand {
  font-family: var(--font-display);
  font-size: clamp(2.8rem, 6vw, 4.4rem);
  font-weight: 900;
  line-height: 1.05;
  letter-spacing: 0.08em;
  color: var(--green-900);
  margin-bottom: 28px;
  animation: rise 0.9s var(--transition) both;
}

.hero-title {
  font-family: var(--font-display);
  font-size: clamp(1.25rem, 2.4vw, 1.65rem);
  font-weight: 700;
  line-height: 1.5;
  margin-bottom: 16px;
  animation: rise 0.9s 0.1s var(--transition) both;
}

.hero-desc {
  color: var(--ink-soft);
  margin-bottom: 32px;
  animation: rise 0.9s 0.2s var(--transition) both;
}

.hero-copy .btn {
  animation: rise 0.9s 0.3s var(--transition) both;
}

.hero-pane-art {
  background: var(--green-800);
  overflow: hidden;
}

.art-orb {
  position: absolute;
  width: 70%;
  height: 70%;
  right: -10%;
  top: 10%;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(78, 196, 143, 0.55), transparent 65%);
  animation: drift 16s ease-in-out infinite;
}

.art-ring {
  position: absolute;
  width: 55%;
  aspect-ratio: 1;
  left: 18%;
  top: 22%;
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 50%;
  animation: spin 40s linear infinite;
}

.art-leaf {
  position: absolute;
  width: 42%;
  aspect-ratio: 1;
  right: 18%;
  bottom: 16%;
  border-radius: 58% 42% 48% 52%;
  background: linear-gradient(145deg, rgba(184, 230, 207, 0.35), transparent);
  border: 1px solid rgba(255, 255, 255, 0.15);
  animation: leaf 12s ease-in-out infinite;
}

.art-frame {
  position: absolute;
  inset: 12% 14%;
  border: 1px solid rgba(255, 255, 255, 0.12);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 26px;
  font-family: inherit;
  font-size: 0.92rem;
  font-weight: 600;
  border: none;
  border-radius: 2px;
  cursor: pointer;
  transition: var(--transition);
}

.btn-primary {
  background: var(--green-800);
  color: var(--white);
}

.btn-primary:hover {
  background: var(--green-900);
  transform: translateY(-2px);
  box-shadow: 0 14px 30px rgba(18, 92, 68, 0.22);
}

/* —— 理念区：通栏大字报 —— */
.story {
  background: var(--white);
  border-top: 1px solid var(--line);
}

.story-ban {
  overflow: hidden;
  border-bottom: 1px solid var(--line);
  background: var(--surface-2);
  padding: 14px 0;
}

.story-ban p {
  white-space: nowrap;
  font-size: 0.8rem;
  letter-spacing: 0.4em;
  color: var(--green-700);
  font-weight: 600;
  animation: marquee 22s linear infinite;
  width: max-content;
}

.story-body {
  max-width: 900px;
  padding: 100px 48px 110px;
  margin: 0 auto;
}

.story-heading {
  font-family: var(--font-display);
  font-size: clamp(1.7rem, 3.5vw, 2.6rem);
  font-weight: 700;
  line-height: 1.45;
  color: var(--green-900);
  margin-bottom: 40px;
}

.story-cols {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  margin-bottom: 40px;
}

.story-cols p {
  color: var(--ink-soft);
  font-size: 1.02rem;
}

.story-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.story-tags li {
  padding: 8px 16px;
  border: 1px solid var(--line);
  color: var(--green-800);
  font-size: 0.88rem;
  font-weight: 500;
}

/* —— 能力：横向滑动带 —— */
.craft {
  padding: 72px 0 80px;
  background: var(--green-900);
  color: var(--white);
}

.craft-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 48px 28px;
}

.craft-head h2 {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 700;
}

.craft-controls {
  display: flex;
  gap: 8px;
}

.craft-btn {
  width: 42px;
  height: 42px;
  border: 1px solid rgba(255, 255, 255, 0.25);
  background: transparent;
  color: var(--white);
  font-size: 1rem;
  cursor: pointer;
  transition: var(--transition);
}

.craft-btn:hover {
  background: var(--green-500);
  border-color: var(--green-500);
}

.craft-track {
  display: flex;
  gap: 16px;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  scroll-behavior: smooth;
  padding: 8px 48px 16px;
  scrollbar-width: none;
}

.craft-track::-webkit-scrollbar {
  display: none;
}

.craft-panel {
  flex: 0 0 min(72vw, 340px);
  scroll-snap-align: start;
  min-height: 280px;
  padding: 36px 32px;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.12);
  display: flex;
  flex-direction: column;
  transition: background var(--transition), transform var(--transition);
}

.craft-panel:hover {
  background: rgba(78, 196, 143, 0.14);
  transform: translateY(-4px);
}

.craft-index {
  font-family: var(--font-display);
  font-size: 2rem;
  color: var(--green-400);
  margin-bottom: auto;
}

.craft-panel h3 {
  font-family: var(--font-display);
  font-size: 1.4rem;
  margin: 24px 0 12px;
}

.craft-panel p {
  color: rgba(255, 255, 255, 0.7);
  font-size: 0.95rem;
}

/* —— 作品：不对称马赛克 —— */
.portfolio {
  padding: 90px 48px 100px;
  background: var(--surface);
}

.portfolio-head {
  max-width: 480px;
  margin-bottom: 48px;
}

.portfolio-head h2 {
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  color: var(--green-900);
  margin-bottom: 10px;
}

.portfolio-head p {
  color: var(--ink-soft);
}

.portfolio-mosaic {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  grid-template-rows: auto auto auto;
  gap: 14px;
}

.mosaic-main {
  grid-row: 1 / 3;
  grid-column: 1;
}

.mosaic-side:nth-of-type(2) {
  grid-column: 2;
  grid-row: 1;
}

.mosaic-side:nth-of-type(3) {
  grid-column: 3;
  grid-row: 1;
}

.mosaic-wide {
  grid-column: 2 / 4;
  grid-row: 2;
}

.mosaic-pair:nth-of-type(5) {
  grid-column: 1 / 2;
  grid-row: 3;
}

.mosaic-pair:nth-of-type(6) {
  grid-column: 2 / 4;
  grid-row: 3;
}

.mosaic-media {
  position: relative;
  height: 100%;
  min-height: 220px;
  overflow: hidden;
  background:
    linear-gradient(155deg,
      hsl(var(--tone, 150), 40%, 40%) 0%,
      hsl(var(--tone, 150), 45%, 24%) 55%,
      hsl(var(--tone, 150), 32%, 16%) 100%);
  transition: transform var(--transition);
}

.mosaic-main .mosaic-media {
  min-height: 100%;
}

.mosaic-media-wide {
  min-height: 200px;
}

.mosaic-media::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 25% 20%, rgba(255, 255, 255, 0.16), transparent 40%),
    linear-gradient(180deg, transparent 40%, rgba(11, 61, 46, 0.65) 100%);
}

.mosaic-media::after {
  content: '';
  position: absolute;
  inset: 16% 18%;
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 48% 52% 42% 58%;
  opacity: 0.45;
}

article:hover .mosaic-media {
  transform: scale(1.015);
}

.mosaic-caption {
  position: absolute;
  left: 20px;
  right: 20px;
  bottom: 20px;
  z-index: 1;
  color: var(--white);
}

.mosaic-caption span {
  display: block;
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  opacity: 0.8;
  margin-bottom: 6px;
}

.mosaic-caption h3 {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 700;
}

.mosaic-main .mosaic-caption h3 {
  font-size: 1.7rem;
}

/* —— 联络：单栏居中收束 —— */
.connect {
  background: var(--white);
  border-top: 1px solid var(--line);
  padding: 100px 24px 90px;
}

.connect-inner {
  max-width: 560px;
  margin: 0 auto;
  text-align: center;
}

.connect-label {
  font-size: 0.8rem;
  letter-spacing: 0.3em;
  color: var(--green-600);
  font-weight: 600;
  margin-bottom: 16px;
}

.connect-title {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  color: var(--green-900);
  margin-bottom: 20px;
}

.connect-email {
  display: inline-block;
  font-size: clamp(1.15rem, 2.5vw, 1.5rem);
  font-weight: 600;
  color: var(--green-700);
  margin-bottom: 10px;
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition);
}

.connect-email:hover {
  border-bottom-color: var(--green-500);
}

.connect-company {
  color: var(--ink-muted);
  font-size: 0.92rem;
  margin-bottom: 40px;
}

.connect-form {
  display: flex;
  flex-direction: column;
  gap: 12px;
  text-align: left;
}

.connect-fields {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.connect-form input,
.connect-form textarea {
  width: 100%;
  padding: 14px 16px;
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--ink);
  font-family: inherit;
  font-size: 0.95rem;
  border-radius: 2px;
  transition: var(--transition);
}

.connect-form input:focus,
.connect-form textarea:focus {
  outline: none;
  border-color: var(--green-500);
  box-shadow: 0 0 0 3px rgba(46, 168, 117, 0.14);
}

.connect-form textarea {
  resize: vertical;
  min-height: 96px;
}

.connect-form .btn {
  align-self: stretch;
}

/* —— 极简页脚 —— */
.footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  padding: 22px 48px;
  background: var(--surface-2);
  border-top: 1px solid var(--line);
  font-size: 0.85rem;
  color: var(--ink-muted);
}

.footer a:hover {
  color: var(--green-700);
}

/* Reveal */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s var(--transition), transform 0.7s var(--transition);
  transition-delay: calc(var(--delay, 0) * 0.08s);
}

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

@keyframes rise {
  from { opacity: 0; transform: translateY(22px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes drift {
  0%, 100% { transform: translate(0, 0); }
  50% { transform: translate(-24px, 18px); }
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

@keyframes leaf {
  0%, 100% { transform: rotate(-6deg) translateY(0); }
  50% { transform: rotate(8deg) translateY(-12px); }
}

@keyframes marquee {
  from { transform: translateX(0); }
  to { transform: translateX(-50%); }
}

/* —— 响应式 —— */
@media (max-width: 1100px) {
  .portfolio-mosaic {
    grid-template-columns: 1fr 1fr;
    grid-template-rows: none;
  }

  .mosaic-main,
  .mosaic-side,
  .mosaic-wide,
  .mosaic-pair {
    grid-column: auto !important;
    grid-row: auto !important;
  }

  .mosaic-main {
    grid-column: 1 / -1 !important;
  }

  .mosaic-main .mosaic-media {
    min-height: 320px;
  }
}

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

  .hero-pane-art {
    min-height: 42vh;
    order: -1;
  }

  .hero-pane-copy {
    min-height: auto;
    padding: 56px 28px 72px;
  }

  .hero-brand-vertical {
    display: none;
  }

  .story-cols {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .story-body,
  .craft-head,
  .craft-track,
  .portfolio,
  .footer {
    padding-left: 28px;
    padding-right: 28px;
  }
}

@media (max-width: 768px) {
  :root {
    --rail-w: 0px;
  }

  .rail {
    width: min(220px, 78vw);
    transform: translateX(-105%);
    transition: transform var(--transition);
    box-shadow: 8px 0 30px rgba(11, 61, 46, 0.2);
  }

  .rail.open {
    transform: translateX(0);
  }

  .rail-nav {
    align-items: flex-start;
    padding-left: 28px;
    width: 100%;
  }

  .rail-nav a {
    writing-mode: horizontal-tb;
    letter-spacing: 0.08em;
    font-size: 1rem;
  }

  .rail-logo {
    writing-mode: horizontal-tb;
    margin: 8px 0 36px;
  }

  .menu-toggle {
    display: flex;
  }

  .menu-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
  }

  .menu-toggle.active span:nth-child(2) {
    opacity: 0;
  }

  .menu-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
  }

  .connect-fields {
    grid-template-columns: 1fr;
  }

  .portfolio-mosaic {
    grid-template-columns: 1fr;
  }
}