/* YYDS 亿点实力 official site
   Accent: brand red #CF1A2D from the wordmark
   Radius: buttons pill, cards 12px, inputs 8px
   Theme: light default, dark via [data-theme] */

:root {
  --red: #cf1a2d;
  --red-deep: #a81424;
  --ink: #1c1d21;
  --muted: #5b5e66;
  --faint: #8a8e96;
  --line: #e2e3e7;
  --bg: #f3f4f6;
  --paper: #f7f8fa;
  --elev: #ffffff;
  --hero-photo: #17181c;
  --shadow: 0 18px 40px rgb(28 29 33 / 0.08);
  --radius: 12px;
  --radius-sm: 8px;
  --nav-h: 68px;
  --ease: cubic-bezier(0.16, 1, 0.3, 1);
  --max: 1180px;
  --font: "PingFang SC", "Hiragino Sans GB", "Noto Sans SC", "Microsoft YaHei UI",
    "Microsoft YaHei", system-ui, sans-serif;
}

[data-theme="dark"] {
  --ink: #f1f2f4;
  --muted: #b3b6be;
  --faint: #8b8f98;
  --line: #2c2e34;
  --bg: #141518;
  --paper: #191a1e;
  --elev: #202126;
  --hero-photo: #0e0f12;
  --shadow: 0 18px 40px rgb(0 0 0 / 0.35);
}

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

html {
  scroll-behavior: smooth;
  color-scheme: light;
}
[data-theme="dark"] {
  color-scheme: dark;
}

html,
body {
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--ink);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

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

button,
input,
select,
textarea {
  font-family: inherit;
}

.skip {
  position: absolute;
  left: 12px;
  top: -40px;
  background: var(--red);
  color: #fff;
  padding: 8px 12px;
  border-radius: 8px;
  z-index: 80;
}
.skip:focus {
  top: 12px;
}

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

/* NAV */
.nav {
  position: sticky;
  top: 0;
  z-index: 40;
  height: var(--nav-h);
  display: flex;
  align-items: center;
  background: color-mix(in srgb, var(--paper) 88%, transparent);
  backdrop-filter: blur(16px) saturate(140%);
  -webkit-backdrop-filter: blur(16px) saturate(140%);
  border-bottom: 1px solid var(--line);
}

.nav-inner {
  width: min(var(--max), calc(100% - 40px));
  margin-inline: auto;
  display: flex;
  align-items: center;
  gap: 28px;
  height: 100%;
}

.logo {
  display: flex;
  align-items: center;
  flex: 0 0 auto;
  height: 32px;
}
.logo img {
  height: 32px;
  width: auto;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-left: 8px;
}

.nav-links a {
  padding: 8px 12px;
  font-size: 14px;
  color: var(--muted);
  border-radius: 999px;
  transition: color 0.2s var(--ease), background 0.2s var(--ease);
}
.nav-links a:hover,
.nav-links a[aria-current="page"] {
  color: var(--ink);
  background: color-mix(in srgb, var(--ink) 6%, transparent);
}

.nav-actions {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 10px;
}

.icon-btn {
  width: 40px;
  height: 40px;
  border: 1px solid var(--line);
  background: var(--elev);
  color: var(--ink);
  border-radius: 999px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: transform 0.15s var(--ease), background 0.2s;
}
.icon-btn:hover {
  background: color-mix(in srgb, var(--ink) 5%, var(--elev));
}
.icon-btn:active {
  transform: scale(0.98);
}
.icon-btn i {
  font-size: 18px;
}

.menu-btn {
  display: none;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  height: 42px;
  padding: 0 18px;
  border-radius: 999px;
  border: 1px solid transparent;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.02em;
  cursor: pointer;
  white-space: nowrap;
  transition: transform 0.15s var(--ease), background 0.2s, color 0.2s, border-color 0.2s;
}
.btn:active {
  transform: translateY(1px) scale(0.98);
}
.btn-primary {
  background: var(--red);
  color: #fff;
}
.btn-primary:hover {
  background: var(--red-deep);
}
.btn-ghost {
  background: transparent;
  color: var(--ink);
  border-color: color-mix(in srgb, var(--ink) 22%, transparent);
}
.btn-ghost:hover {
  background: var(--elev);
}
.btn-light {
  background: #fff;
  color: var(--red);
}
.btn-light:hover {
  background: #f4f4f5;
}
.btn i {
  font-size: 16px;
}

/* HERO */
.hero {
  min-height: 100dvh;
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  background: var(--paper);
}

.hero-copy {
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 72px 8% 64px;
  max-width: 640px;
}

.kicker {
  font-size: 13px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--red);
  font-weight: 700;
  margin: 0 0 16px;
}

.hero h1 {
  font-size: clamp(36px, 4.6vw, 58px);
  line-height: 1.12;
  letter-spacing: -0.03em;
  font-weight: 700;
  margin: 0 0 18px;
}

.hero-lead {
  font-size: 16px;
  color: var(--muted);
  max-width: 36ch;
  margin: 0 0 28px;
}

.hero-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.hero-visual {
  position: relative;
  background: var(--hero-photo);
  min-height: 420px;
  overflow: hidden;
}
.hero-visual img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  position: absolute;
  inset: 0;
}

/* STATS */
.stats {
  background: var(--elev);
  border-block: 1px solid var(--line);
}
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
}
.stat {
  padding: 28px 8px 28px 0;
  border-right: 1px solid var(--line);
}
.stat:last-child {
  border-right: 0;
}
.stat b {
  display: block;
  font-size: clamp(28px, 3vw, 40px);
  letter-spacing: -0.04em;
  line-height: 1.1;
  font-weight: 700;
}
.stat span {
  display: block;
  margin-top: 6px;
  color: var(--muted);
  font-size: 13px;
}

/* SECTIONS */
.section {
  padding: 88px 0;
}
.section h2 {
  font-size: clamp(28px, 3.4vw, 42px);
  letter-spacing: -0.03em;
  line-height: 1.18;
  margin: 0 0 12px;
  font-weight: 700;
}
.lede {
  color: var(--muted);
  max-width: 62ch;
  margin: 0 0 40px;
  font-size: 16px;
}

/* BENTO SERVICES */
.bento {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  grid-template-rows: auto auto;
  gap: 16px;
}
.tile {
  position: relative;
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--elev);
  min-height: 240px;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  color: #fff;
  isolation: isolate;
}
.tile img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  z-index: -2;
  transition: transform 0.7s var(--ease);
}
.tile:hover img {
  transform: scale(1.04);
}
.tile::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background: linear-gradient(180deg, transparent 20%, rgb(16 16 18 / 0.78) 100%);
}
.tile-lg {
  grid-row: 1 / span 2;
  min-height: 520px;
}
.tile-body {
  padding: 24px;
}
.tile h3 {
  margin: 0 0 6px;
  font-size: 22px;
  letter-spacing: -0.02em;
}
.tile p {
  margin: 0;
  color: rgb(255 255 255 / 0.82);
  font-size: 14px;
  max-width: 40ch;
}
.tile-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 14px;
  font-size: 13px;
  font-weight: 600;
  color: #fff;
}
.tile-plain {
  background: var(--red);
  color: #fff;
  justify-content: space-between;
  padding: 28px;
  min-height: 240px;
}
.tile-plain::after,
.tile-plain img {
  display: none;
}
.tile-plain h3 {
  font-size: 26px;
}
.tile-plain p {
  color: rgb(255 255 255 / 0.88);
}

/* CASE RAIL */
.rail-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 28px;
}
.rail-head .lede {
  margin: 8px 0 0;
}
.rail {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: 260px;
  gap: 16px;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  padding-bottom: 8px;
  margin-inline: calc(50% - 50vw + 20px);
  padding-inline: max(20px, calc(50vw - var(--max) / 2));
}
.rail::-webkit-scrollbar {
  height: 6px;
}
.rail::-webkit-scrollbar-thumb {
  background: var(--line);
  border-radius: 99px;
}
.case-card {
  scroll-snap-align: start;
  background: var(--elev);
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--line);
}
.case-card img {
  width: 100%;
  height: 340px;
  object-fit: cover;
  object-position: top;
}
.case-card figcaption {
  padding: 14px 14px 16px;
}
.case-card h3 {
  margin: 0 0 4px;
  font-size: 15px;
}
.case-card p {
  margin: 0;
  color: var(--muted);
  font-size: 13px;
}

/* ADVANTAGE LIST */
.adv-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0 48px;
}
.adv {
  padding: 28px 0;
  border-top: 1px solid var(--line);
}
.adv strong {
  display: block;
  font-size: 20px;
  margin-bottom: 8px;
  letter-spacing: -0.02em;
}
.adv p {
  margin: 0;
  color: var(--muted);
  max-width: 48ch;
}

/* AI BAND: photo as asset, not a theme flip */
.ai-band {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  background: var(--elev);
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--line);
  min-height: 420px;
}
.ai-copy {
  padding: 48px 44px;
  display: flex;
  flex-direction: column;
  justify-content: center;
}
.ai-copy h2 {
  margin-bottom: 12px;
}
.ai-points {
  display: grid;
  gap: 16px;
  margin-top: 8px;
}
.ai-points dt {
  font-weight: 700;
  margin: 0;
}
.ai-points dd {
  margin: 4px 0 0;
  color: var(--muted);
  font-size: 14px;
}
.ai-photo {
  position: relative;
  min-height: 320px;
}
.ai-photo img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* AWARDS */
.awards img {
  width: 100%;
  border-radius: var(--radius);
  background: var(--elev);
  border: 1px solid var(--line);
}

/* CTA */
.cta {
  background: var(--red);
  color: #fff;
  padding: 72px 0;
}
.cta h2 {
  color: #fff;
  margin: 0 0 10px;
}
.cta p {
  margin: 0 0 24px;
  max-width: 46ch;
  color: rgb(255 255 255 / 0.88);
}

/* FOOTER */
.footer {
  background: var(--paper);
  border-top: 1px solid var(--line);
  padding: 48px 0 28px;
  color: var(--muted);
  font-size: 13px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 32px;
  margin-bottom: 36px;
}
.footer .logo img {
  height: 28px;
  margin-bottom: 12px;
}
.footer h3 {
  margin: 0 0 12px;
  font-size: 13px;
  color: var(--ink);
  font-weight: 700;
}
.footer ul {
  list-style: none;
  margin: 0;
  padding: 0;
}
.footer li {
  margin: 0 0 8px;
}
.footer a:hover {
  color: var(--ink);
}
.legal {
  border-top: 1px solid var(--line);
  padding-top: 16px;
  display: flex;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}

/* PAGE HERO (inner) */
.page-hero {
  padding: 72px 0 28px;
}
.page-hero h1 {
  font-size: clamp(32px, 4vw, 52px);
  letter-spacing: -0.03em;
  line-height: 1.15;
  margin: 0 0 12px;
}
.page-hero p {
  color: var(--muted);
  max-width: 58ch;
  margin: 0;
}

/* SERVICE BLOCKS */
.svc {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 40px;
  align-items: center;
  padding: 56px 0;
  border-top: 1px solid var(--line);
}
.svc img {
  width: 100%;
  height: 380px;
  object-fit: cover;
  border-radius: var(--radius);
}
.svc h2 {
  font-size: 30px;
}
.svc ul {
  margin: 16px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 14px;
}
.svc li strong {
  display: block;
  margin-bottom: 2px;
}
.svc li span {
  color: var(--muted);
  font-size: 14px;
}
.svc-stack {
  display: block;
  padding: 56px 0;
  border-top: 1px solid var(--line);
}
.svc-stack img {
  width: 100%;
  height: 360px;
  object-fit: cover;
  border-radius: var(--radius);
  margin-bottom: 28px;
}

/* FILTER */
.filters {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 8px 0 32px;
}
.chip {
  height: 36px;
  padding: 0 14px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--elev);
  color: var(--ink);
  font-size: 13px;
  cursor: pointer;
}
.chip[aria-pressed="true"],
.chip:hover {
  background: var(--ink);
  color: var(--bg);
  border-color: var(--ink);
}

.case-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}
.case-full {
  background: var(--elev);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}
.case-full .shot {
  height: 420px;
  object-fit: cover;
  object-position: top;
  width: 100%;
}
.case-full .meta {
  padding: 22px 24px 26px;
}
.case-full h3 {
  margin: 0 0 6px;
  font-size: 20px;
}
.case-full p {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
}
.metrics {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-top: 18px;
}
.metrics div {
  background: var(--paper);
  border-radius: var(--radius-sm);
  padding: 12px;
}
.metrics b {
  display: block;
  font-size: 20px;
  letter-spacing: -0.03em;
}
.metrics span {
  font-size: 12px;
  color: var(--muted);
}
.hidden {
  display: none !important;
}

.brand-mosaic {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  grid-template-rows: 220px 220px;
  gap: 12px;
  margin-top: 16px;
}
.brand-mosaic img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: var(--radius);
}
.brand-mosaic img:first-child {
  grid-row: 1 / span 2;
  height: 100%;
}

/* ABOUT */
.about-intro {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 40px;
  align-items: start;
}
.about-intro img {
  width: 100%;
  height: 420px;
  object-fit: cover;
  border-radius: var(--radius);
}
.timeline {
  display: grid;
  gap: 0;
  margin-top: 12px;
}
.tl {
  display: grid;
  grid-template-columns: 88px 1fr;
  gap: 16px;
  padding: 18px 0;
  border-top: 1px solid var(--line);
}
.tl time {
  color: var(--red);
  font-weight: 700;
  font-size: 13px;
}
.tl strong {
  display: block;
}
.tl span {
  color: var(--muted);
  font-size: 13px;
}

/* FORM */
.contact-layout {
  display: grid;
  grid-template-columns: 1fr 0.85fr;
  gap: 48px;
  align-items: start;
  padding-bottom: 80px;
}
.form {
  display: grid;
  gap: 16px;
  background: var(--elev);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 28px;
}
.field {
  display: grid;
  gap: 6px;
}
.field label {
  font-size: 13px;
  font-weight: 600;
}
.field .hint {
  font-size: 12px;
  color: var(--faint);
}
.field .err {
  font-size: 12px;
  color: var(--red);
  display: none;
}
.field.invalid .err {
  display: block;
}
.field.invalid input,
.field.invalid select,
.field.invalid textarea {
  border-color: var(--red);
}
input,
select,
textarea {
  width: 100%;
  border: 1px solid var(--line);
  background: var(--paper);
  color: var(--ink);
  border-radius: var(--radius-sm);
  padding: 10px 12px;
  font-size: 15px;
}
input::placeholder,
textarea::placeholder {
  color: var(--faint);
}
input:focus,
select:focus,
textarea:focus {
  outline: 2px solid color-mix(in srgb, var(--red) 45%, transparent);
  outline-offset: 1px;
  border-color: var(--red);
}
textarea {
  min-height: 120px;
  resize: vertical;
}
.form-ok {
  display: none;
  padding: 28px;
  background: var(--elev);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  scroll-margin-top: calc(var(--nav-h) + 16px);
}
.form-ok[data-show="true"] {
  display: block;
}
.form[data-hide="true"] {
  display: none;
}
.aside-note {
  color: var(--muted);
}
.aside-note h2 {
  font-size: 28px;
}

.pipe {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  margin-top: 8px;
}
.pipe article {
  padding-top: 18px;
  border-top: 1px solid var(--line);
}
.pipe strong {
  display: block;
  font-size: 18px;
  letter-spacing: -0.02em;
  margin-bottom: 8px;
}
.pipe p {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
}

.mobile-panel {
  display: none;
}

@media (prefers-reduced-motion: no-preference) {
  .reveal.in {
    animation: rise 0.7s var(--ease) both;
  }
}
@keyframes rise {
  from {
    transform: translateY(14px);
  }
  to {
    transform: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  .reveal,
  .reveal.in,
  .tile img,
  .btn,
  .icon-btn {
    transition: none !important;
    animation: none !important;
    transform: none !important;
  }
}

@media (prefers-reduced-transparency: reduce) {
  .nav {
    background: var(--paper);
    backdrop-filter: none;
  }
}

body.nav-open {
  overflow: hidden;
}

@media (max-width: 900px) {
  .rail-head {
    flex-direction: column;
    align-items: flex-start;
  }
  .hero,
  .ai-band,
  .svc,
  .about-intro,
  .contact-layout,
  .case-grid,
  .adv-grid,
  .footer-grid,
  .bento,
  .stats-grid,
  .brand-mosaic {
    grid-template-columns: 1fr;
    grid-template-rows: none;
  }
  .tile-lg {
    grid-row: auto;
    min-height: 340px;
  }
  .hero {
    min-height: unset;
  }
  .hero-copy {
    padding: 88px 20px 40px;
    max-width: none;
  }
  .hero-visual {
    min-height: 280px;
  }
  .stats-grid {
    grid-template-columns: 1fr 1fr;
  }
  .stat {
    padding: 20px 12px;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }
  .nav-links,
  .nav .btn {
    display: none;
  }
  .menu-btn {
    display: inline-flex;
  }
  .svc img,
  .svc-stack img,
  .about-intro img {
    height: 240px;
  }
  .case-full .shot {
    height: 280px;
  }
  .metrics {
    grid-template-columns: 1fr;
  }
  .pipe {
    grid-template-columns: 1fr 1fr;
  }
  .brand-mosaic {
    grid-template-columns: 1fr 1fr;
    grid-template-rows: 180px 180px;
  }
  .brand-mosaic img:first-child {
    grid-row: auto;
    grid-column: 1 / -1;
    height: 220px;
  }
  .mobile-panel[data-open="true"] {
    display: flex;
    position: fixed;
    inset: var(--nav-h) 0 0 0;
    z-index: 39;
    background: var(--paper);
    flex-direction: column;
    padding: 20px;
    gap: 8px;
    overflow: auto;
  }
  .mobile-panel a {
    padding: 14px 8px;
    border-bottom: 1px solid var(--line);
    font-size: 18px;
  }
}

@media (max-width: 640px) {
  .wrap,
  .nav-inner {
    width: calc(100% - 32px);
  }
  .section {
    padding: 64px 0;
  }
  .hero h1 {
    font-size: 34px;
  }
  .rail {
    grid-auto-columns: 220px;
  }
}