/* ============================================================
   GAOWEI — Computer Systems Design & Related Services
   Light theme · electric cyan accent · unique shelf layout
   ============================================================ */

:root {
  --bg: #F4FCFD;
  --surface: #FFFFFF;
  --ink: #123B44;
  --deep: #0A6B77;
  --cyan: #00B3C4;
  --pale: #BFE9EE;
  --ink-dark: #0B2B33;
  --line: #D8EEF2;
  --hairline: #C7E6EB;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  color: var(--ink);
  background-color: var(--bg);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

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

a {
  color: var(--deep);
  text-decoration: none;
}

a:hover {
  color: var(--cyan);
}

.container {
  width: 100%;
  max-width: 1160px;
  margin: 0 auto;
  padding: 0 24px;
}

h1, h2, h3, h4 {
  line-height: 1.15;
  color: var(--ink);
  font-weight: 700;
}

/* ============ SCROLL REVEAL ============ */
.fade-up {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-up.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ============================================================
   NAVIGATION — shopping bag nav
   ============================================================ */
.bag-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: var(--surface);
  border-bottom: 2px solid var(--cyan);
  box-shadow: 0 1px 0 var(--hairline);
}

.bag-nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  height: 72px;
}

.bag-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  flex: 0 0 auto;
}

.bag-glyph {
  position: relative;
  width: 26px;
  height: 20px;
  background-color: var(--cyan);
  border-radius: 4px;
  display: inline-block;
  margin-top: 8px;
}

.bag-glyph::before {
  content: "";
  position: absolute;
  top: -8px;
  left: 50%;
  transform: translateX(-50%);
  width: 14px;
  height: 9px;
  border: 2px solid var(--cyan);
  border-bottom: none;
  border-radius: 9px 9px 0 0;
}

.bag-wordmark {
  font-size: 1.4rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  color: var(--deep);
}

.bag-links {
  display: flex;
  align-items: center;
  gap: 4px;
  list-style: none;
  flex: 1 1 auto;
  justify-content: center;
}

.bag-links a {
  display: block;
  padding: 10px 16px;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--ink);
  position: relative;
  border-radius: 8px;
}

.bag-links a:hover {
  color: var(--deep);
}

.bag-links a.active {
  color: var(--deep);
}

.bag-links a.active::after {
  content: "";
  position: absolute;
  left: 16px;
  right: 16px;
  bottom: 2px;
  height: 3px;
  background-color: var(--cyan);
  border-radius: 2px;
}

.bag-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  flex: 0 0 auto;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 22px;
  border-radius: 10px;
  font-weight: 700;
  font-size: 0.95rem;
  border: 2px solid transparent;
  cursor: pointer;
  transition: transform 0.15s ease, background-color 0.2s ease, color 0.2s ease;
  text-align: center;
}

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

.btn-cyan {
  background-color: var(--cyan);
  color: var(--ink-dark);
  border-color: var(--cyan);
}

.btn-cyan:hover {
  background-color: #00a6b6;
  color: var(--ink-dark);
}

.btn-navy {
  background-color: var(--deep);
  color: #FFFFFF;
  border-color: var(--deep);
}

.btn-navy:hover {
  background-color: var(--ink-dark);
  color: #FFFFFF;
}

.btn-outline {
  background-color: transparent;
  color: var(--deep);
  border-color: var(--deep);
}

.btn-outline:hover {
  background-color: var(--deep);
  color: #FFFFFF;
}

.btn-sm {
  padding: 9px 16px;
  font-size: 0.85rem;
}

.bag-cart {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background-color: var(--ink-dark);
  color: #FFFFFF;
  font-weight: 800;
  font-size: 0.85rem;
  cursor: pointer;
}

.bag-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  width: 42px;
  height: 42px;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: 2px solid var(--deep);
  border-radius: 8px;
  cursor: pointer;
}

.bag-toggle span {
  display: block;
  width: 20px;
  height: 2px;
  background-color: var(--deep);
  border-radius: 2px;
}

/* ============================================================
   HERO — shelf hero
   ============================================================ */
.shelf-hero {
  background-color: var(--bg);
  padding: 72px 0 64px;
}

.shelf-hero .container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
}

.hero-copy .eyebrow {
  display: inline-block;
  background-color: var(--pale);
  color: var(--deep);
  font-weight: 700;
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 7px 14px;
  border-radius: 999px;
  margin-bottom: 20px;
}

.hero-copy h1 {
  font-size: clamp(2rem, 4.2vw, 3.2rem);
  margin-bottom: 20px;
  letter-spacing: -0.01em;
}

.hero-copy .subcopy {
  font-size: 1.1rem;
  color: var(--ink);
  max-width: 520px;
  margin-bottom: 30px;
}

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

/* shelf display */
.shelf-display {
  background-color: var(--surface);
  border: 2px solid var(--hairline);
  border-radius: 20px;
  padding: 30px 24px 24px;
  box-shadow: 0 12px 30px rgba(18, 59, 68, 0.06);
}

.shelf-row {
  margin-bottom: 30px;
}

.shelf-row:last-child {
  margin-bottom: 0;
}

.shelf-products {
  display: flex;
  align-items: flex-end;
  gap: 16px;
  padding: 0 8px;
}

.prod {
  width: 74px;
  border-radius: 10px;
  position: relative;
}

.prod.cyan {
  background-color: var(--cyan);
  height: 74px;
}

.prod.white {
  background-color: var(--surface);
  border: 2px solid var(--cyan);
  height: 58px;
}

.prod.navy {
  background-color: var(--deep);
  height: 88px;
}

.prod.pale {
  background-color: var(--pale);
  height: 62px;
}

.prod.dark {
  background-color: var(--ink-dark);
  height: 70px;
}

.prod .dot {
  position: absolute;
  bottom: -18px;
  left: 50%;
  transform: translateX(-50%);
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--cyan);
}

.prod .dot.navy-dot {
  background-color: var(--deep);
}

.shelf-bar {
  height: 8px;
  background-color: var(--deep);
  border-radius: 6px;
  margin-top: 8px;
}

/* ============================================================
   STATEMENT ROW
   ============================================================ */
.statement-row {
  background-color: var(--surface);
  border-top: 2px solid var(--hairline);
  border-bottom: 2px solid var(--hairline);
  padding: 56px 0;
}

.statement-row .container {
  text-align: center;
}

.statement-row h2 {
  font-size: clamp(1.5rem, 3vw, 2.3rem);
  max-width: 900px;
  margin: 0 auto;
  color: var(--ink);
}

.statement-row .statement-mark {
  display: inline-block;
  width: 34px;
  height: 6px;
  background-color: var(--cyan);
  border-radius: 3px;
  margin-bottom: 22px;
}

/* ============================================================
   PROMO ROWS
   ============================================================ */
.promo-rows {
  background-color: var(--bg);
  padding: 64px 0;
}

.section-head {
  margin-bottom: 32px;
}

.section-head .eyebrow {
  display: inline-block;
  color: var(--deep);
  font-weight: 700;
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 10px;
}

.section-head h2 {
  font-size: clamp(1.6rem, 3vw, 2.4rem);
  margin-bottom: 12px;
}

.section-head p {
  color: var(--ink);
  max-width: 640px;
}

.promo-list {
  background-color: var(--surface);
  border: 2px solid var(--hairline);
  border-radius: 18px;
  overflow: hidden;
}

.promo-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 26px 30px;
  border-bottom: 1px solid var(--hairline);
}

.promo-row:last-child {
  border-bottom: none;
}

.promo-row .promo-info h3 {
  font-size: 1.25rem;
  margin-bottom: 4px;
  color: var(--ink);
}

.promo-row .promo-info p {
  color: var(--ink);
}

.tag {
  display: inline-block;
  padding: 6px 14px;
  border-radius: 999px;
  font-weight: 800;
  font-size: 0.8rem;
  letter-spacing: 0.06em;
}

.tag-new {
  background-color: var(--cyan);
  color: var(--ink-dark);
}

.tag-hot {
  background-color: var(--deep);
  color: #FFFFFF;
}

.tag-vip {
  background-color: var(--pale);
  color: var(--deep);
}

/* ============================================================
   RATING ROW
   ============================================================ */
.rating-row {
  background-color: var(--bg);
  padding: 24px 0 64px;
}

.rating-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.rating-badge {
  border-radius: 16px;
  padding: 28px 24px;
  text-align: center;
}

.rating-badge .rating-num {
  font-size: 2.3rem;
  font-weight: 800;
  line-height: 1;
  margin-bottom: 8px;
}

.rating-badge .rating-label {
  font-weight: 600;
}

.rating-badge.cyan {
  background-color: var(--cyan);
  color: var(--ink-dark);
}

.rating-badge.navy {
  background-color: var(--deep);
  color: #FFFFFF;
}

.rating-badge.pale {
  background-color: var(--pale);
  color: var(--deep);
}

/* ============================================================
   SERVICE ROWS
   ============================================================ */
.service-rows {
  background-color: var(--surface);
  border-top: 2px solid var(--hairline);
  border-bottom: 2px solid var(--hairline);
  padding: 64px 0;
}

.service-list {
  margin-top: 24px;
}

.service-row {
  display: flex;
  align-items: flex-start;
  gap: 20px;
  padding: 26px 0;
  border-bottom: 1px solid var(--hairline);
}

.service-row:last-child {
  border-bottom: none;
}

.service-marker {
  flex: 0 0 auto;
  width: 18px;
  height: 18px;
  background-color: var(--cyan);
  border-radius: 4px;
  margin-top: 6px;
}

.service-row h3 {
  font-size: 1.2rem;
  margin-bottom: 6px;
  color: var(--ink);
}

.service-row p {
  color: var(--ink);
  max-width: 760px;
}

/* ============================================================
   FAQ ACCORDION
   ============================================================ */
.faq-section {
  background-color: var(--bg);
  padding: 64px 0;
}

.faq-list {
  max-width: 820px;
  margin-top: 8px;
}

.faq-item {
  background-color: var(--surface);
  border: 2px solid var(--hairline);
  border-radius: 12px;
  margin-bottom: 14px;
  overflow: hidden;
}

.faq-item.open {
  border-color: var(--cyan);
}

.faq-q {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 20px 22px;
  background-color: var(--surface);
  border: none;
  cursor: pointer;
  text-align: left;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--ink);
  font-family: inherit;
}

.faq-q .faq-icon {
  flex: 0 0 auto;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background-color: var(--cyan);
  color: var(--ink-dark);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  font-weight: 800;
  transition: transform 0.2s ease;
}

.faq-item.open .faq-icon {
  transform: rotate(45deg);
}

.faq-a {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease;
}

.faq-a-inner {
  padding: 0 22px 22px;
  color: var(--ink);
}

.faq-item.open .faq-a {
  max-height: 400px;
}

/* ============================================================
   CTA BAND
   ============================================================ */
.cta-band {
  background-color: var(--cyan);
  padding: 64px 0;
}

.cta-band .container {
  text-align: center;
}

.cta-band h2 {
  color: var(--ink-dark);
  font-size: clamp(1.6rem, 3vw, 2.5rem);
  margin-bottom: 14px;
}

.cta-band p {
  color: var(--ink-dark);
  max-width: 620px;
  margin: 0 auto 28px;
}

/* ============================================================
   FOOTER — bag footer
   ============================================================ */
.bag-footer {
  background-color: var(--surface);
  border-top: 2px solid var(--cyan);
  padding: 56px 0 32px;
}

.footer-cols {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1.4fr;
  gap: 40px;
  margin-bottom: 36px;
}

.footer-brand {
  display: flex;
  align-items: flex-start;
  gap: 12px;
}

.footer-brand .bag-glyph {
  margin-top: 4px;
}

.footer-brand .footer-wordmark {
  font-size: 1.2rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  color: var(--deep);
  margin-bottom: 6px;
}

.footer-brand p {
  color: var(--ink);
  font-size: 0.95rem;
}

.footer-col h4 {
  font-size: 0.85rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--deep);
  margin-bottom: 16px;
}

.footer-col ul {
  list-style: none;
}

.footer-col ul li {
  margin-bottom: 10px;
}

.footer-col ul li a {
  color: var(--ink);
  font-weight: 600;
}

.footer-col ul li a:hover {
  color: var(--cyan);
}

.footer-contact p {
  color: var(--ink);
  margin-bottom: 10px;
  font-size: 0.95rem;
}

.footer-contact a {
  color: var(--deep);
  font-weight: 600;
}

.footer-legal {
  border-top: 1px solid var(--hairline);
  padding-top: 22px;
  text-align: center;
  color: var(--ink);
  font-size: 0.9rem;
}

.footer-legal a {
  color: var(--deep);
  font-weight: 600;
}

.footer-legal a:hover {
  color: var(--cyan);
}

/* ============================================================
   CONTACT FORM
   ============================================================ */
.contact-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
}

.contact-info h3 {
  font-size: 1.25rem;
  margin-bottom: 10px;
  color: var(--ink);
}

.contact-info p {
  color: var(--ink);
  margin-bottom: 18px;
}

.contact-detail {
  display: flex;
  gap: 14px;
  align-items: flex-start;
  padding: 18px 0;
  border-bottom: 1px solid var(--hairline);
}

.contact-detail .detail-marker {
  flex: 0 0 auto;
  width: 16px;
  height: 16px;
  background-color: var(--cyan);
  border-radius: 4px;
  margin-top: 6px;
}

.contact-detail h4 {
  font-size: 1rem;
  margin-bottom: 4px;
  color: var(--ink);
}

.contact-detail p {
  margin-bottom: 0;
}

.contact-detail a {
  color: var(--deep);
  font-weight: 600;
}

.contact-form-card {
  background-color: var(--surface);
  border: 2px solid var(--hairline);
  border-radius: 18px;
  padding: 32px;
}

.contact-form-card h3 {
  font-size: 1.3rem;
  margin-bottom: 6px;
  color: var(--ink);
}

.contact-form-card > p {
  color: var(--ink);
  margin-bottom: 22px;
}

.form-group {
  margin-bottom: 18px;
}

.form-group label {
  display: block;
  font-weight: 700;
  font-size: 0.9rem;
  color: var(--deep);
  margin-bottom: 6px;
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 13px 14px;
  border: 2px solid var(--hairline);
  border-radius: 10px;
  font-size: 1rem;
  font-family: inherit;
  color: var(--ink);
  background-color: #FFFFFF;
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--cyan);
}

.form-group textarea {
  min-height: 130px;
  resize: vertical;
}

.form-status {
  margin-top: 14px;
  font-weight: 600;
  color: var(--deep);
}

/* ============================================================
   SECONDARY PAGE HERO / GENERIC
   ============================================================ */
.page-hero {
  background-color: var(--bg);
  padding: 64px 0 48px;
  border-bottom: 2px solid var(--hairline);
}

.page-hero h1 {
  font-size: clamp(1.9rem, 4vw, 2.9rem);
  margin-bottom: 14px;
}

.page-hero p {
  font-size: 1.1rem;
  max-width: 720px;
  color: var(--ink);
}

.content-band {
  padding: 64px 0;
  background-color: var(--surface);
  border-bottom: 2px solid var(--hairline);
}

.content-band.alt {
  background-color: var(--bg);
}

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 900px) {
  .contact-layout {
    grid-template-columns: 1fr;
  }

  .shelf-hero .container {
    grid-template-columns: 1fr;
  }

  .shelf-display {
    max-width: 460px;
  }

  .footer-cols {
    grid-template-columns: 1fr 1fr;
  }

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

  .bag-links {
    display: none;
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    background-color: var(--surface);
    flex-direction: column;
    align-items: stretch;
    padding: 12px 20px 20px;
    border-bottom: 2px solid var(--cyan);
    box-shadow: 0 10px 24px rgba(18, 59, 68, 0.08);
  }

  .bag-links.open {
    display: flex;
  }

  .bag-links a {
    padding: 14px 12px;
    border-bottom: 1px solid var(--hairline);
  }

  .bag-links a.active::after {
    display: none;
  }

  .bag-toggle {
    display: flex;
  }

  .bag-actions .btn-sm {
    display: none;
  }

  .bag-nav {
    position: relative;
  }
}

@media (max-width: 560px) {
  .footer-cols {
    grid-template-columns: 1fr;
  }

  .promo-row {
    flex-direction: column;
    align-items: flex-start;
  }

  .shelf-products {
    gap: 10px;
  }

  .prod {
    width: 60px;
  }
}