/* ───────────────────────────────────────────────────────────
   OBAI website — page styles.
   Built on the Orange Banana AI design tokens
   (assets/colors_and_type.css). Cream paper, ink outlines,
   stamp shadows, orange accent. Strong CJK fallbacks so
   Traditional / Simplified Chinese and Japanese render cleanly.
   ─────────────────────────────────────────────────────────── */

:root {
  --font-cjk: "PingFang TC", "PingFang SC", "Hiragino Sans",
              "Hiragino Kaku Gothic ProN", "Noto Sans CJK TC",
              "Noto Sans CJK SC", "Noto Sans CJK JP",
              "Microsoft JhengHei", "Microsoft YaHei", sans-serif;
  --display-stack: "Bricolage Grotesque", var(--font-cjk);
  --body-stack: "Plus Jakarta Sans", var(--font-cjk);
  --maxw: 1180px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; scroll-padding-top: 92px; }

body {
  margin: 0;
  background: var(--obai-paper-200);
  color: var(--obai-ink-900);
  font-family: var(--body-stack);
  font-size: var(--fs-base);
  line-height: var(--lh-body);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

::selection { background: var(--obai-orange-200); color: var(--obai-ink-900); }

.wrap { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 var(--space-6); }

/* ── Eyebrow / label ─────────────────────────────────────── */
.eyebrow {
  display: inline-flex; align-items: center; gap: var(--space-2);
  font-family: var(--body-stack);
  font-weight: 700;
  font-size: var(--fs-xs);
  letter-spacing: var(--tracking-caps);
  text-transform: uppercase;
  color: var(--obai-orange-600);
}
.eyebrow::before {
  content: ""; width: 22px; height: 3px; border-radius: 2px;
  background: var(--obai-orange-500);
}

h1, h2, h3, h4 { font-family: var(--display-stack); margin: 0; color: var(--obai-ink-900); }

/* ── Buttons ─────────────────────────────────────────────── */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: var(--space-2);
  font-family: var(--body-stack); font-weight: 700; font-size: var(--fs-base);
  border-radius: var(--radius-pill);
  padding: 13px 24px;
  cursor: pointer; border: var(--border-strong);
  text-decoration: none; white-space: nowrap;
  transition: transform var(--dur-fast) var(--ease-out),
              box-shadow var(--dur-fast) var(--ease-out),
              background var(--dur-fast) var(--ease-out);
}
.btn-primary {
  background: var(--obai-orange-500); color: var(--obai-ink-900);
  box-shadow: var(--shadow-stamp);
}
.btn-primary:hover {
  background: var(--obai-orange-400); transform: translateY(-2px);
  box-shadow: var(--shadow-stamp-lg);
}
.btn-primary:active {
  background: var(--obai-orange-600);
  transform: translate(2px, 2px); box-shadow: 1px 1px 0 var(--obai-ink-900);
}
.btn-ghost {
  background: transparent; color: var(--obai-ink-900);
  box-shadow: none; border-color: transparent; padding: 10px 14px;
}
.btn-ghost:hover { background: var(--obai-paper-300); }
.btn i { width: 18px; height: 18px; stroke-width: 2.4; }

/* ════════════ NAV ════════════ */
.nav {
  position: sticky; top: 0; z-index: 100;
  background: var(--obai-paper-200);
  border-bottom: var(--border-soft);
  transition: box-shadow var(--dur-base) var(--ease-out);
}
.nav.scrolled { box-shadow: var(--shadow-sm); }
.nav-inner {
  max-width: var(--maxw); margin: 0 auto; padding: 10px var(--space-6);
  display: flex; align-items: center; gap: var(--space-6);
}
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; flex-shrink: 0; }
.brand img {
  height: 46px; width: 46px; object-fit: contain;
  border: 2px solid var(--obai-ink-900); border-radius: 12px;
  background: var(--obai-paper-100);
}
.brand .wm { display: flex; flex-direction: column; line-height: 1; }
.brand .wm b {
  font-family: var(--display-stack); font-weight: 800; font-size: 20px;
  letter-spacing: -0.01em; color: var(--obai-ink-900);
}
.brand .wm span {
  font-size: 9.5px; letter-spacing: 0.12em; text-transform: uppercase;
  color: var(--obai-ink-500); font-weight: 600; margin-top: 3px; white-space: nowrap;
}
.nav-links { display: flex; align-items: center; gap: 2px; margin-left: auto; }
.nav-links a {
  font-family: var(--body-stack); font-weight: 600; font-size: var(--fs-sm);
  color: var(--obai-ink-700); text-decoration: none;
  padding: 8px 12px; border-radius: var(--radius-md);
  transition: color var(--dur-fast), background var(--dur-fast);
  white-space: nowrap;
}
.nav-links a:hover { color: var(--obai-ink-900); background: var(--obai-paper-300); }

/* language switcher */
.lang {
  display: flex; align-items: center; gap: 2px;
  background: var(--obai-paper-100);
  border: var(--border-soft); border-radius: var(--radius-pill);
  padding: 3px;
}
.lang button {
  font-family: var(--body-stack); font-weight: 700; font-size: 13px;
  border: none; background: transparent; color: var(--obai-ink-500);
  padding: 5px 11px; border-radius: var(--radius-pill); cursor: pointer;
  transition: all var(--dur-fast) var(--ease-out); line-height: 1;
}
.lang button:hover { color: var(--obai-ink-900); }
.lang button.active {
  background: var(--obai-orange-500); color: var(--obai-ink-900);
  box-shadow: 1px 1px 0 var(--obai-ink-900);
}
.nav-cta { flex-shrink: 0; }

.nav-burger {
  display: none; border: var(--border-soft); background: var(--obai-paper-100);
  border-radius: var(--radius-md); padding: 8px; cursor: pointer; color: var(--obai-ink-900);
}
.nav-burger i { width: 20px; height: 20px; stroke-width: 2.2; display: block; }

/* ════════════ SECTION SCAFFOLD ════════════ */
.section { padding: var(--space-10) 0; }
.section-head { max-width: 760px; margin-bottom: var(--space-8); }
.section-head h2 {
  font-weight: 800; font-size: var(--fs-2xl); line-height: var(--lh-snug);
  letter-spacing: -0.01em; margin-top: var(--space-3);
}
.section-head p { color: var(--obai-ink-600); font-size: var(--fs-md); margin: var(--space-3) 0 0; }

/* reveal on scroll */
.reveal { opacity: 0; transform: translateY(18px); transition: opacity .6s var(--ease-out), transform .6s var(--ease-out); }
.reveal.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) { .reveal { opacity: 1; transform: none; transition: none; } }

/* ════════════ HERO ════════════ */
.hero { position: relative; overflow: hidden; padding: var(--space-10) 0 var(--space-9); }
.hero-wash {
  position: absolute; inset: 0; z-index: 0; pointer-events: none;
  background:
    radial-gradient(560px 420px at 82% 18%, rgba(237,122,24,0.16), transparent 70%),
    radial-gradient(520px 380px at 12% 90%, rgba(245,190,43,0.13), transparent 72%);
}
.hero-inner {
  position: relative; z-index: 1;
  display: grid; grid-template-columns: 1.05fr 0.95fr; gap: var(--space-9); align-items: center;
}
.hero-copy { max-width: 600px; }
.hero h1 {
  font-weight: 800; font-size: clamp(34px, 4.6vw, 60px);
  line-height: 1.06; letter-spacing: -0.02em; margin: var(--space-4) 0 var(--space-5);
  text-wrap: balance;
}
.hero .sub { font-size: var(--fs-md); color: var(--obai-ink-700); line-height: var(--lh-body); margin: 0 0 var(--space-6); }
.tagchips { display: flex; flex-wrap: wrap; gap: var(--space-2); margin-bottom: var(--space-7); }
.tagchips span {
  display: inline-flex; align-items: center; gap: 7px;
  font-size: var(--fs-sm); font-weight: 600; color: var(--obai-ink-800);
  background: var(--obai-orange-50); border: 1.5px solid var(--obai-orange-200);
  border-radius: var(--radius-pill); padding: 7px 14px;
}
.tagchips span::before { content: ""; width: 6px; height: 6px; border-radius: 50%; background: var(--obai-orange-500); }
.hero-actions { display: flex; flex-wrap: wrap; gap: var(--space-3); align-items: center; }

.hero-logo { display: flex; justify-content: center; }
.hero-logo .logo-card {
  position: relative; background: var(--obai-paper-100);
  border: var(--border-bold); border-radius: var(--radius-2xl);
  box-shadow: var(--shadow-stamp-lg); padding: 10px;
  max-width: 440px; width: 100%;
}
.hero-logo img { display: block; width: 100%; height: auto; border-radius: var(--radius-xl); }
.hero-logo .sticker {
  position: absolute; top: -16px; right: -14px; transform: rotate(7deg);
  font-family: var(--font-hand); font-weight: 700; font-size: 26px; color: var(--obai-ink-900);
  background: var(--obai-yellow-300); border: var(--border-strong);
  border-radius: var(--radius-pill); padding: 4px 16px; box-shadow: var(--shadow-stamp);
}

/* ════════════ CASE STUDY ════════════ */
.case-card {
  background: var(--obai-ink-900); color: var(--obai-paper-100);
  border-radius: var(--radius-2xl); padding: var(--space-9);
  display: grid; grid-template-columns: 1fr; gap: var(--space-6);
  position: relative; overflow: hidden;
}
.case-card .eyebrow { color: var(--obai-orange-300); }
.case-card h2 { color: var(--obai-paper-100); font-weight: 800; font-size: var(--fs-xl); }
.case-stats { display: flex; flex-wrap: wrap; gap: var(--space-7); }
.case-stat { }
.case-stat b {
  display: block; font-family: var(--display-stack); font-weight: 800;
  font-size: var(--fs-3xl); line-height: 1; color: var(--obai-orange-400);
}
.case-stat span { font-size: var(--fs-sm); color: var(--obai-ink-200); }
.case-body { font-size: var(--fs-md); color: var(--obai-ink-100); line-height: var(--lh-loose); max-width: 880px; }
.case-take {
  border-left: 4px solid var(--obai-orange-500); padding-left: var(--space-5);
  font-size: var(--fs-md); color: var(--obai-paper-100); font-weight: 500; line-height: var(--lh-body);
  max-width: 880px;
}

/* ════════════ RESHAPE ════════════ */
.reshape-grid { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-8); align-items: start; }
.reshape-paras { display: flex; flex-direction: column; gap: var(--space-5); }
.reshape-paras p { margin: 0; font-size: var(--fs-md); color: var(--obai-ink-700); line-height: var(--lh-loose); }
.reshape-paras p:last-child {
  font-weight: 700; color: var(--obai-ink-900);
  border-top: var(--border-soft); padding-top: var(--space-5);
}

/* ════════════ ABOUT ════════════ */
.about-points { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-6); margin-top: var(--space-7); }
.point {
  background: var(--obai-paper-100); border: var(--border-strong);
  border-radius: var(--radius-lg); box-shadow: var(--shadow-stamp);
  padding: var(--space-6);
}
.point .pn {
  display: inline-flex; align-items: center; justify-content: center;
  width: 46px; height: 46px; border-radius: 14px; margin-bottom: var(--space-4);
  background: var(--obai-orange-100); border: var(--border-strong); color: var(--obai-ink-900);
}
.point .pn i { width: 24px; height: 24px; stroke-width: 2.2; }
.point h3 { font-weight: 700; font-size: var(--fs-lg); margin-bottom: var(--space-3); }
.point p { margin: 0; color: var(--obai-ink-600); font-size: var(--fs-base); line-height: var(--lh-body); }

/* ════════════ ADVANTAGES ════════════ */
.adv-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--space-5); }
.adv {
  background: var(--obai-paper-100); border: var(--border-strong);
  border-radius: var(--radius-lg); box-shadow: var(--shadow-stamp);
  padding: var(--space-6);
  transition: transform var(--dur-base) var(--ease-out), box-shadow var(--dur-base) var(--ease-out);
}
.adv:hover { transform: translateY(-4px); box-shadow: var(--shadow-stamp-lg); }
.adv .ic {
  display: inline-flex; align-items: center; justify-content: center;
  width: 52px; height: 52px; border-radius: 16px; margin-bottom: var(--space-4);
  background: var(--obai-orange-500); border: var(--border-strong); color: var(--obai-ink-900);
}
.adv .ic i { width: 26px; height: 26px; stroke-width: 2.2; }
.adv .num { font-family: var(--font-mono); font-size: var(--fs-xs); color: var(--obai-orange-600); font-weight: 700; }
.adv h3 { font-weight: 700; font-size: var(--fs-md); margin: var(--space-2) 0 var(--space-3); line-height: var(--lh-snug); }
.adv p { margin: 0; color: var(--obai-ink-600); font-size: var(--fs-sm); line-height: var(--lh-body); }

/* ════════════ PRODUCTS ════════════ */
.section-alt { background: var(--obai-paper-100); border-top: var(--border-soft); border-bottom: var(--border-soft); }
.prod-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-5); }
.prod {
  background: var(--obai-paper-200); border: var(--border-strong);
  border-radius: var(--radius-lg); padding: var(--space-6);
  display: flex; flex-direction: column; gap: var(--space-3);
  box-shadow: var(--shadow-stamp);
  transition: transform var(--dur-base) var(--ease-out), box-shadow var(--dur-base) var(--ease-out);
}
.prod:hover { transform: translateY(-4px); box-shadow: var(--shadow-stamp-lg); }
.prod .ic {
  display: inline-flex; align-items: center; justify-content: center;
  width: 46px; height: 46px; border-radius: 13px;
  background: var(--obai-ink-900); color: var(--obai-orange-400);
}
.prod .ic i { width: 23px; height: 23px; stroke-width: 2.1; }
.prod h3 { font-weight: 700; font-size: var(--fs-md); line-height: var(--lh-snug); }
.prod p { margin: 0; color: var(--obai-ink-600); font-size: var(--fs-sm); line-height: var(--lh-body); }

.prod-badges { display: flex; flex-wrap: wrap; gap: var(--space-3); margin-top: var(--space-8); justify-content: center; }
.prod-badges span {
  font-family: var(--body-stack); font-weight: 700; font-size: var(--fs-sm);
  color: var(--obai-ink-900); background: var(--obai-yellow-300);
  border: var(--border-strong); border-radius: var(--radius-pill);
  padding: 9px 20px; box-shadow: var(--shadow-stamp);
}

/* ════════════ SERVICES ════════════ */
.svc-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 0; border: var(--border-strong); border-radius: var(--radius-xl); overflow: hidden; background: var(--obai-paper-100); }
.svc {
  padding: var(--space-7); border-bottom: var(--border-soft); border-right: var(--border-soft);
  display: flex; gap: var(--space-4); align-items: flex-start;
  transition: background var(--dur-fast) var(--ease-out);
}
.svc:hover { background: var(--obai-orange-50); }
.svc:nth-child(2n) { border-right: none; }
.svc:nth-last-child(-n+2) { border-bottom: none; }
.svc .ic {
  flex-shrink: 0; display: inline-flex; align-items: center; justify-content: center;
  width: 44px; height: 44px; border-radius: 12px;
  background: var(--obai-orange-100); border: var(--border-strong); color: var(--obai-ink-900);
}
.svc .ic i { width: 22px; height: 22px; stroke-width: 2.2; }
.svc h3 { font-weight: 700; font-size: var(--fs-md); margin-bottom: 6px; }
.svc p { margin: 0; color: var(--obai-ink-600); font-size: var(--fs-sm); line-height: var(--lh-body); }

/* ════════════ MISSION ════════════ */
.mission { background: var(--obai-ink-900); position: relative; overflow: hidden; }
.mission .wrap { position: relative; z-index: 1; }
.mission-wash { position: absolute; inset: 0; z-index: 0;
  background: radial-gradient(600px 400px at 80% 30%, rgba(237,122,24,0.20), transparent 70%); }
.mission blockquote {
  margin: 0; max-width: 980px;
  font-family: var(--display-stack); font-weight: 700;
  font-size: clamp(24px, 3vw, 40px); line-height: 1.32; letter-spacing: -0.01em;
  color: var(--obai-paper-100); text-wrap: balance;
}
.mission .mark { font-family: var(--font-hand); color: var(--obai-orange-400); font-size: 88px; line-height: 0; display: block; height: 36px; }

/* ════════════ CONTACT ════════════ */
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-9); align-items: start; }
.contact-copy h2 { font-weight: 800; font-size: var(--fs-2xl); line-height: var(--lh-snug); margin-bottom: var(--space-5); }
.contact-copy .line1 { font-size: var(--fs-lg); color: var(--obai-ink-800); font-weight: 600; margin: 0 0 var(--space-4); }
.contact-copy .line2 { font-size: var(--fs-md); color: var(--obai-ink-600); margin: 0 0 var(--space-6); }
.contact-mail {
  display: inline-flex; align-items: center; gap: var(--space-3);
  background: var(--obai-paper-100); border: var(--border-strong); border-radius: var(--radius-lg);
  padding: var(--space-4) var(--space-5); box-shadow: var(--shadow-stamp); text-decoration: none;
}
.contact-mail .ic { display: inline-flex; width: 40px; height: 40px; border-radius: 11px; background: var(--obai-orange-500); border: var(--border-strong); align-items: center; justify-content: center; color: var(--obai-ink-900); }
.contact-mail .ic i { width: 20px; height: 20px; stroke-width: 2.3; }
.contact-mail .t { display: flex; flex-direction: column; line-height: 1.3; }
.contact-mail .t small { font-size: var(--fs-xs); color: var(--obai-ink-500); text-transform: uppercase; letter-spacing: 0.1em; font-weight: 700; }
.contact-mail .t b { font-family: var(--font-mono); font-size: var(--fs-md); color: var(--obai-ink-900); font-weight: 600; }

.form-card {
  background: var(--obai-paper-100); border: var(--border-strong);
  border-radius: var(--radius-2xl); box-shadow: var(--shadow-stamp-lg); padding: var(--space-8);
}
.field { margin-bottom: var(--space-5); }
.field label { display: block; font-weight: 700; font-size: var(--fs-sm); margin-bottom: var(--space-2); color: var(--obai-ink-800); }
.field input, .field textarea {
  width: 100%; font-family: var(--body-stack); font-size: var(--fs-base); color: var(--obai-ink-900);
  background: var(--obai-paper-200); border: 1.5px solid var(--obai-ink-300);
  border-radius: var(--radius-md); padding: 12px 14px; outline: none;
  transition: border-color var(--dur-fast), box-shadow var(--dur-fast);
}
.field textarea { resize: vertical; min-height: 110px; }
.field input:focus, .field textarea:focus { border-color: var(--obai-orange-500); box-shadow: 0 0 0 3px var(--obai-orange-100); }
.field input::placeholder, .field textarea::placeholder { color: var(--obai-ink-400); }
.form-card .btn-primary { width: 100%; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-4); }
.form-ok {
  display: none; margin-top: var(--space-4); padding: var(--space-4);
  background: var(--obai-leaf-100); border: 1.5px solid var(--obai-leaf-500);
  border-radius: var(--radius-md); color: var(--obai-ink-800); font-weight: 600; font-size: var(--fs-sm);
}
.form-ok.show { display: block; }

/* ════════════ FOOTER ════════════ */
.footer { background: var(--obai-paper-300); border-top: var(--border-soft); padding: var(--space-9) 0 var(--space-7); }
.footer-inner { display: flex; flex-wrap: wrap; gap: var(--space-7); justify-content: space-between; align-items: flex-start; }
.footer .brand img { height: 56px; width: 56px; }
.footer .brand .wm b { font-size: 22px; }
.footer-meta { display: flex; flex-direction: column; gap: 6px; text-align: right; }
.footer-meta a { color: var(--obai-ink-700); text-decoration: none; font-size: var(--fs-sm); font-weight: 600; }
.footer-meta a:hover { color: var(--obai-orange-600); }
.footer-meta .dom { font-family: var(--font-mono); }

/* contact-section email image (18 px dark ink) */
.email-img-contact {
  display: block;
  height: 22px;
  width: auto;
  margin-top: 1px;
}

/* email rendered as image — invisible to scrapers */
.email-img {
  display: block;
  height: 18px;
  width: auto;
  opacity: 0.82;
  transition: opacity var(--dur-fast) var(--ease-out),
              filter var(--dur-fast) var(--ease-out);
}
.footer-meta a:hover .email-img {
  opacity: 1;
  /* tints the SVG fill to --obai-orange-600 (#D6650B) on hover */
  filter: brightness(0) saturate(100%)
          invert(38%) sepia(72%) saturate(600%)
          hue-rotate(10deg) brightness(0.92);
}
.footer-copy { margin-top: var(--space-7); padding-top: var(--space-5); border-top: var(--border-soft); color: var(--obai-ink-500); font-size: var(--fs-xs); }

/* ════════════ RESPONSIVE ════════════ */
@media (max-width: 980px) {
  .hero-inner { grid-template-columns: 1fr; gap: var(--space-7); }
  .hero-logo { order: -1; }
  .hero-logo .logo-card { max-width: 340px; }
  .reshape-grid { grid-template-columns: 1fr; gap: var(--space-5); }
  .adv-grid { grid-template-columns: repeat(2, 1fr); }
  .prod-grid { grid-template-columns: repeat(2, 1fr); }
  .nav-links { display: none; }
  .nav-burger { display: inline-flex; }
  .nav-cta { display: none; }
}
@media (max-width: 640px) {
  .section { padding: var(--space-9) 0; }
  .about-points, .contact-grid, .svc-grid, .adv-grid, .prod-grid { grid-template-columns: 1fr; }
  .svc { border-right: none; }
  .form-row { grid-template-columns: 1fr; }
  .case-card { padding: var(--space-7); }
  .contact-grid { gap: var(--space-7); }
  .brand .wm span { display: none; }
  .footer-meta { text-align: left; }
}

/* mobile menu drawer */
.mobile-menu {
  display: none; position: fixed; inset: 0; z-index: 200;
  background: rgba(26,24,20,0.45);
}
.mobile-menu.open { display: block; }
.mobile-menu .panel {
  position: absolute; top: 0; right: 0; height: 100%; width: min(82vw, 340px);
  background: var(--obai-paper-100); border-left: var(--border-strong);
  padding: var(--space-6); display: flex; flex-direction: column; gap: var(--space-2);
  box-shadow: var(--shadow-lg);
}
.mobile-menu .panel .close { align-self: flex-end; border: var(--border-soft); background: transparent; border-radius: 10px; padding: 6px; cursor: pointer; color: var(--obai-ink-900); }
.mobile-menu .panel a {
  font-family: var(--display-stack); font-weight: 700; font-size: var(--fs-lg);
  color: var(--obai-ink-900); text-decoration: none; padding: 12px 8px;
  border-bottom: var(--border-soft);
}
.mobile-menu .panel .btn-primary { margin-top: var(--space-4); }