/* MIBASE.com — layout inspired by huanxi-ai, brand: black + crimson */
:root {
  --canvas: #0a0908;
  --s1: #111112;
  --s2: #151517;
  --s3: #1a1a1c;
  --hair: rgba(255, 255, 255, 0.08);
  --hair-strong: rgba(255, 255, 255, 0.14);
  --hair-3: rgba(255, 255, 255, 0.2);
  --ink: #ffffff;
  --ink-muted: rgba(255, 255, 255, 0.8);
  --ink-subtle: rgba(255, 255, 255, 0.5);
  --ink-3: rgba(255, 255, 255, 0.34);
  --inv: #ffffff;
  --inv-ink: #0a0908;
  --accent: #c41e3a;
  --accent-lit: #e84a5f;
  --accent-soft: rgba(196, 30, 58, 0.14);
  --max-w: 1120px;
  --gutter: 24px;
  --ease: cubic-bezier(0.16, 1, 0.3, 1);
  --sans: "Sora", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --display: "Fraunces", "Noto Serif SC", "Songti SC", serif;
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  --r-md: 8px;
  --r-lg: 12px;
  --r-xl: 16px;
  --header-h: 64px;
  --safe-bottom: env(safe-area-inset-bottom, 0px);
}

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

::selection {
  background: var(--ink);
  color: var(--canvas);
}

html {
  scroll-behavior: smooth;
  overflow-x: hidden;
  -webkit-text-size-adjust: 100%;
}

body {
  background: var(--canvas);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  overflow-x: clip;
  min-height: 100vh;
}

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

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

button,
input,
textarea,
select {
  font: inherit;
  color: inherit;
}

.wrap {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 var(--gutter);
  position: relative;
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--accent);
  color: #fff;
  padding: 0.5rem 1rem;
  z-index: 200;
}

.skip-link:focus {
  left: 0.5rem;
  top: 0.5rem;
}

/* Reveal */
.rv {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 0.6s var(--ease), transform 0.6s var(--ease);
}

.rv.in {
  opacity: 1;
  transform: none;
}

.rv[data-d="1"] {
  transition-delay: 0.06s;
}
.rv[data-d="2"] {
  transition-delay: 0.12s;
}
.rv[data-d="3"] {
  transition-delay: 0.18s;
}
.rv[data-d="4"] {
  transition-delay: 0.24s;
}

@media (prefers-reduced-motion: reduce) {
  .rv {
    opacity: 1;
    transform: none;
    transition: none;
  }
}

/* Nav */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--header-h);
  display: flex;
  align-items: center;
  background: rgba(10, 9, 8, 0.55);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid transparent;
  transition: background 0.3s, border-color 0.3s;
}

.nav.scrolled {
  background: rgba(10, 9, 8, 0.92);
  border-bottom-color: var(--hair);
}

.nav-in {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 var(--gutter);
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  white-space: nowrap;
}

.brand img {
  height: 36px;
  width: auto;
  max-width: min(180px, 48vw);
  object-fit: contain;
}

.close-r .footer-logo,
.footer-logo {
  display: block;
  height: 48px;
  width: auto;
  max-width: min(220px, 70vw);
  object-fit: contain;
}

.brand-sub {
  font-size: 13px;
  color: var(--ink-subtle);
  margin-left: 4px;
  padding-left: 12px;
  border-left: 1px solid var(--hair-strong);
}

.nav-r {
  display: flex;
  align-items: center;
  gap: 20px;
}

.nav-link {
  font-size: 14px;
  font-weight: 500;
  color: var(--ink-subtle);
  transition: color 0.15s;
}

.nav-link:hover,
.nav-link[aria-current="page"] {
  color: var(--ink);
}

.nav-cta {
  display: inline-flex;
  align-items: center;
  height: 32px;
  padding: 0 14px;
  border-radius: var(--r-md);
  background: var(--inv);
  color: var(--inv-ink);
  font-size: 14px;
  font-weight: 500;
  transition: background 0.15s;
}

.nav-cta:hover {
  background: #e8e9ea;
}

.lang {
  display: inline-flex;
  align-items: center;
  gap: 2px;
  padding: 3px;
  border: 1px solid var(--hair);
  border-radius: 999px;
}

.lang button {
  display: inline-flex;
  align-items: center;
  height: 24px;
  padding: 0 11px;
  border: 0;
  border-radius: 999px;
  background: transparent;
  font-size: 12px;
  font-weight: 500;
  color: var(--ink-3);
  cursor: pointer;
}

.lang button[aria-pressed="true"] {
  color: var(--ink);
  background: var(--s3);
}

.menu-toggle {
  display: none;
  width: 40px;
  height: 40px;
  border: 1px solid var(--hair);
  border-radius: var(--r-md);
  background: var(--s1);
  cursor: pointer;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
}

.menu-toggle span {
  display: block;
  width: 16px;
  height: 1.5px;
  background: var(--ink);
}

.nav-drawer {
  display: none;
}

/* Buttons */
.btn-main,
.btn-ghost,
.btn-accent {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 40px;
  padding: 0 16px;
  border-radius: var(--r-md);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  border: 0;
  transition: background 0.15s, border-color 0.15s;
}

.btn-main {
  background: var(--inv);
  color: var(--inv-ink);
}

.btn-main:hover {
  background: #e8e9ea;
}

.btn-ghost {
  border: 1px solid var(--hair);
  background: var(--s1);
  color: var(--ink);
}

.btn-ghost:hover {
  background: var(--s2);
  border-color: var(--hair-strong);
}

.btn-accent {
  background: linear-gradient(135deg, var(--accent), #9a1530);
  color: #fff;
}

.btn-block {
  width: 100%;
}

/* Hero */
.hero {
  padding: 132px 0 80px;
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(0, 0.8fr);
  gap: 48px;
  align-items: center;
}

.hero-eyebrow {
  font-size: 14px;
  color: var(--ink-subtle);
  margin-bottom: 14px;
}

.hero h1 {
  font-family: var(--display);
  font-size: clamp(34px, 5vw, 48px);
  font-weight: 550;
  letter-spacing: -0.03em;
  line-height: 1.12;
}

.hero-sub {
  margin-top: 22px;
  max-width: 560px;
  font-size: 17px;
  line-height: 1.65;
  color: var(--ink-subtle);
}

.hero-sub b {
  color: var(--ink);
  font-weight: 500;
}

.hero-cta {
  margin-top: 28px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.hero-trust {
  margin-top: 26px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  font-size: 13px;
  color: var(--ink-3);
}

.hero-trust em {
  font-style: normal;
  color: var(--hair-3);
}

/* Download rows */
.dl {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.dlr {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr) 20px;
  align-items: center;
  gap: 14px;
  padding: 16px 18px;
  border: 1px solid var(--hair);
  border-radius: 14px;
  background: var(--s1);
  transition: background 0.2s var(--ease), border-color 0.2s var(--ease);
}

.dlr:hover {
  background: var(--s2);
  border-color: var(--hair-strong);
}

.dlr.rec {
  border-color: var(--hair-3);
  background: var(--s2);
}

.dlr-ic {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--accent-lit);
}

.dlr-ic svg {
  width: 22px;
  height: 22px;
}

.dlr-txt b {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 15px;
  font-weight: 500;
}

.dlr-you {
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--accent-lit);
  background: var(--accent-soft);
  border: 1px solid rgba(196, 30, 58, 0.35);
  border-radius: 4px;
  padding: 2px 6px;
}

.dlr-txt em {
  display: block;
  margin-top: 3px;
  font-style: normal;
  font-size: 13px;
  color: var(--ink-subtle);
}

.dlr-act {
  color: var(--ink-3);
}

.dlr-act svg {
  width: 18px;
  height: 18px;
}

/* Sections */
.sec {
  padding: 96px 0;
  scroll-margin-top: 84px;
}

.sec-n {
  display: block;
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.4px;
  color: var(--ink-subtle);
  margin-bottom: 14px;
}

.pill {
  display: inline-block;
  font-size: 13px;
  font-weight: 500;
  color: var(--ink-muted);
  background: var(--s1);
  border: 1px solid var(--hair);
  border-radius: var(--r-md);
  padding: 6px 10px;
  margin-bottom: 18px;
}

.h2 {
  font-family: var(--display);
  font-size: clamp(28px, 4vw, 36px);
  font-weight: 550;
  letter-spacing: -0.02em;
  line-height: 1.2;
}

.sec-head {
  max-width: 720px;
  margin-bottom: 40px;
}

.sec-head.c {
  text-align: center;
  margin-left: auto;
  margin-right: auto;
}

.sec-sub {
  margin-top: 12px;
  font-size: 17px;
  line-height: 1.55;
  color: var(--ink-subtle);
}

.day-def {
  margin-top: 18px;
  font-size: 18px;
  line-height: 1.6;
  color: var(--ink-muted);
  max-width: 820px;
}

.day-def b {
  color: var(--ink);
  font-weight: 500;
}

.fx-pill {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 22px;
  padding: 9px 18px;
  border: 1px solid var(--hair-strong);
  border-radius: 999px;
  background: var(--s1);
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.03em;
  color: var(--ink);
}

.fx-pill em {
  font-style: normal;
  color: var(--ink-3);
}

/* Day cards */
.day-grid {
  display: grid;
  gap: 12px;
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.day-card {
  padding: 20px 18px;
  border: 1px solid var(--hair);
  border-radius: var(--r-xl);
  background: var(--s1);
  transition: border-color 0.2s, background 0.2s;
}

.day-card:hover {
  border-color: var(--hair-strong);
  background: var(--s2);
}

.day-card .t {
  font-size: 12px;
  color: var(--accent-lit);
  font-family: var(--mono);
  margin-bottom: 8px;
}

.day-card h3 {
  font-size: 16px;
  font-weight: 500;
  margin-bottom: 8px;
}

.day-card p {
  font-size: 14px;
  line-height: 1.65;
  color: var(--ink-subtle);
}

/* Capability steps */
.cap-grid {
  display: grid;
  gap: 12px;
}

.cap-item {
  display: grid;
  grid-template-columns: 56px minmax(0, 1fr);
  gap: 16px;
  padding: 22px 20px;
  border: 1px solid var(--hair);
  border-radius: var(--r-xl);
  background: var(--s1);
}

.cap-item .n {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--ink-3);
}

.cap-item h3 {
  font-size: 17px;
  font-weight: 500;
  margin-bottom: 6px;
}

.cap-item p {
  font-size: 15px;
  line-height: 1.65;
  color: var(--ink-subtle);
}

.cap-item b {
  color: var(--ink);
  font-weight: 500;
}

/* Close / FAQ */
.close-sec {
  border-top: 1px solid var(--hair);
  padding: 80px 0 calc(64px + var(--safe-bottom));
}

.close-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(0, 0.65fr);
  gap: 64px;
  align-items: start;
}

.qa-h {
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.4px;
  color: var(--ink-subtle);
  margin-bottom: 24px;
}

.qa {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 28px 40px;
}

.qa dt {
  font-size: 15px;
  font-weight: 500;
}

.qa dd {
  margin-top: 8px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink-subtle);
}

.close-r {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.close-r p {
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink-subtle);
}

.close-box {
  padding: 16px;
  border: 1px solid var(--hair);
  border-radius: var(--r-lg);
  background: var(--s1);
}

.close-box b {
  display: block;
  font-size: 14px;
  font-weight: 500;
  margin-bottom: 6px;
}

.close-box span,
.close-box a {
  font-size: 13px;
  line-height: 1.6;
  color: var(--ink-subtle);
}

.close-box a {
  color: var(--accent-lit);
  word-break: break-all;
}

.close-links {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.close-links a {
  font-size: 13px;
  color: var(--ink-3);
}

.close-links a:hover {
  color: var(--ink);
}

.disclaimer {
  margin-top: 28px;
  padding: 14px 16px;
  border-left: 3px solid var(--accent);
  background: var(--accent-soft);
  border-radius: 0 var(--r-md) var(--r-md) 0;
  font-size: 13px;
  line-height: 1.65;
  color: var(--ink-subtle);
}

/* Inner pages */
.page-hero {
  padding: 120px 0 28px;
}

.page-hero h1 {
  font-family: var(--display);
  font-size: clamp(28px, 4vw, 40px);
  letter-spacing: -0.02em;
  margin-bottom: 12px;
}

.page-hero p {
  color: var(--ink-subtle);
  max-width: 40rem;
  font-size: 17px;
}

.prose {
  max-width: 46rem;
  padding-bottom: 64px;
}

.prose h2 {
  font-family: var(--display);
  font-size: 1.35rem;
  margin: 2rem 0 0.75rem;
}

.prose p,
.prose li {
  color: var(--ink-subtle);
  line-height: 1.7;
}

.prose ul {
  padding-left: 1.2rem;
  margin: 0.5rem 0;
}

.prose strong {
  color: var(--ink);
}

.info-table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.25rem 0;
}

.info-table th,
.info-table td {
  text-align: left;
  padding: 0.75rem 0.4rem;
  border-bottom: 1px solid var(--hair);
  vertical-align: top;
}

.info-table th {
  width: 8rem;
  color: var(--ink-subtle);
  font-weight: 500;
}

.contact-layout {
  display: grid;
  gap: 20px;
  padding-bottom: 72px;
}

@media (min-width: 860px) {
  .contact-layout {
    grid-template-columns: 0.9fr 1.1fr;
  }
}

.contact-card,
.form-card {
  padding: 22px;
  border: 1px solid var(--hair);
  border-radius: var(--r-xl);
  background: var(--s1);
}

.contact-card h2,
.form-card h2 {
  font-family: var(--display);
  font-size: 1.3rem;
  margin-bottom: 1rem;
}

.contact-list {
  list-style: none;
  display: grid;
  gap: 1rem;
}

.contact-list strong {
  display: block;
  margin-bottom: 0.2rem;
}

.contact-list li {
  color: var(--ink-subtle);
  font-size: 14px;
}

.contact-list a {
  color: var(--accent-lit);
}

.form-grid {
  display: grid;
  gap: 12px;
}

.field label {
  display: block;
  margin-bottom: 6px;
  font-size: 13px;
  color: var(--ink-subtle);
}

.field input,
.field textarea,
.field select {
  width: 100%;
  min-height: 42px;
  padding: 10px 12px;
  border-radius: var(--r-md);
  border: 1px solid var(--hair);
  background: var(--canvas);
  outline: none;
}

.field textarea {
  min-height: 120px;
  resize: vertical;
}

.field input:focus,
.field textarea:focus,
.field select:focus {
  border-color: rgba(196, 30, 58, 0.55);
  box-shadow: 0 0 0 3px var(--accent-soft);
}

.form-note {
  margin-top: 12px;
  font-size: 13px;
  color: var(--ink-3);
}

.form-success {
  display: none;
  margin-top: 12px;
  padding: 12px;
  border-radius: var(--r-md);
  border: 1px solid rgba(61, 154, 106, 0.4);
  background: rgba(61, 154, 106, 0.12);
  color: #9ad4b4;
  font-size: 14px;
}

.form-success.is-visible {
  display: block;
}

.scene-list {
  display: grid;
  gap: 12px;
  padding-bottom: 48px;
}

@media (min-width: 700px) {
  .scene-list {
    grid-template-columns: 1fr 1fr;
  }
}

.scene-item {
  padding: 18px;
  border: 1px solid var(--hair);
  border-radius: var(--r-xl);
  background: var(--s1);
}

.scene-item h3 {
  font-size: 16px;
  margin-bottom: 6px;
}

.scene-item p {
  font-size: 14px;
  color: var(--ink-subtle);
  line-height: 1.65;
}

.site-footer-mini {
  border-top: 1px solid var(--hair);
  padding: 24px 0 calc(24px + var(--safe-bottom));
  font-size: 13px;
  color: var(--ink-3);
}

/* Mobile / WeChat */
@media (max-width: 900px) {
  .hero-grid,
  .close-grid {
    grid-template-columns: 1fr;
    gap: 36px;
  }

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

  .qa {
    grid-template-columns: 1fr;
    gap: 22px;
  }

  .brand-sub,
  .nav-link.hide-m {
    display: none;
  }

  .menu-toggle {
    display: inline-flex;
  }

  .nav-drawer {
    position: fixed;
    inset: var(--header-h) 0 auto 0;
    display: none;
    flex-direction: column;
    gap: 4px;
    padding: 12px var(--gutter) 16px;
    background: rgba(10, 9, 8, 0.96);
    border-bottom: 1px solid var(--hair);
  }

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

  .nav-drawer a {
    padding: 12px 10px;
    border-radius: var(--r-md);
    color: var(--ink-muted);
    font-size: 15px;
  }

  .hero {
    padding: 104px 0 56px;
  }

  .sec {
    padding: 64px 0;
  }

  .hero-cta .btn-main,
  .hero-cta .btn-ghost,
  .hero-cta .btn-accent {
    flex: 1 1 auto;
  }
}

@media (max-width: 420px) {
  .fx-pill {
    white-space: normal;
    text-align: center;
  }
}