/* ============================================================
   Ruiyu Material Co., Limited — style.css
   Theme: LIGHT with DEEP EVERGREEN accent
   ============================================================ */

:root {
  --ink: #1D241A;
  --paper: #F5F6F1;
  --white: #FFFFFF;
  --evergreen: #14532D;
  --evergreen-2: #166534;
  --evergreen-dark: #0E3B20;
  --olive: #4D7C0F;
  --sage: #E7EDDF;
  --sage-2: #DDE7D3;
  --muted: #46523F;
  --line: #D5DECA;
  --warm-line: #C7D3BC;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.65;
  color: var(--ink);
  background-color: var(--paper);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

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

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

ul, ol {
  list-style: none;
}

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

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

.section-head {
  display: flex;
  align-items: flex-start;
  gap: 20px;
  margin-bottom: 40px;
}

.section-head h2 {
  font-size: clamp(1.7rem, 3.2vw, 2.4rem);
  margin-bottom: 10px;
  letter-spacing: -0.02em;
}

.section-index {
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--evergreen);
  padding-top: 8px;
  flex-shrink: 0;
}

.section-index.light {
  color: var(--sage);
}

.section-lede {
  color: var(--muted);
  max-width: 520px;
}

/* ============================================================
   RULER BAR NAVIGATION
   ============================================================ */

.ruler-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: var(--paper);
  border-bottom: 1px solid var(--line);
  box-shadow: 0 1px 0 rgba(0, 0, 0, 0.02);
}

.ruler-ticks {
  height: 16px;
  background-image:
    repeating-linear-gradient(to right, var(--evergreen) 0 3px, transparent 3px 132px),
    repeating-linear-gradient(to right, #9CB08A 0 1px, transparent 1px 22px);
  background-position: 0 0, 0 9px;
  background-repeat: repeat-x;
  border-bottom: 1px solid var(--line);
}

.ruler-row {
  display: flex;
  align-items: center;
  gap: 28px;
  max-width: 1160px;
  margin: 0 auto;
  padding: 14px 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-right: auto;
}

.brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border-radius: 6px;
  background-color: var(--evergreen);
  color: #FFFFFF;
  font-weight: 800;
  font-size: 0.8rem;
  letter-spacing: 0.02em;
}

.brand-text {
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 26px;
}

.nav-links a {
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--ink);
  padding: 6px 0;
  position: relative;
  transition: color 0.18s ease;
}

.nav-links a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 2px;
  background-color: var(--evergreen);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.2s ease;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--evergreen);
}

.nav-links a:hover::after,
.nav-links a.active::after {
  transform: scaleX(1);
}

.nav-cta {
  display: inline-block;
  padding: 10px 20px;
  border-radius: 6px;
  background-color: var(--evergreen);
  color: #FFFFFF;
  font-weight: 700;
  font-size: 0.9rem;
  white-space: nowrap;
  transition: background-color 0.18s ease, transform 0.18s ease;
}

.nav-cta:hover {
  background-color: var(--evergreen-2);
  transform: translateY(-1px);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 10px;
  background: transparent;
  border: 1px solid var(--line);
  border-radius: 6px;
  cursor: pointer;
}

.nav-toggle span {
  display: block;
  height: 2px;
  width: 100%;
  background-color: var(--ink);
  transition: transform 0.2s ease, opacity 0.2s ease;
}

/* ============================================================
   BUTTONS
   ============================================================ */

.btn {
  display: inline-block;
  padding: 13px 26px;
  border-radius: 6px;
  font-weight: 700;
  font-size: 0.95rem;
  border: 2px solid transparent;
  cursor: pointer;
  transition: background-color 0.18s ease, color 0.18s ease, border-color 0.18s ease, transform 0.18s ease;
}

.btn-primary {
  background-color: var(--evergreen);
  color: #FFFFFF;
}

.btn-primary:hover {
  background-color: var(--evergreen-2);
  transform: translateY(-1px);
}

.btn-ghost {
  background-color: transparent;
  color: var(--evergreen);
  border-color: var(--evergreen);
}

.btn-ghost:hover {
  background-color: var(--evergreen);
  color: #FFFFFF;
}

/* ============================================================
   HERO — STACKED SHEETS
   ============================================================ */

.hero-section {
  padding: 72px 0 96px;
  background-color: var(--paper);
}

.hero-stack {
  position: relative;
  max-width: 1160px;
  margin: 0 auto;
  padding: 0 24px;
}

.sheet {
  border-radius: 10px;
}

.sheet-back {
  position: absolute;
  inset: 0;
  transform: translate(26px, 26px);
  background-color: var(--olive);
}

.sheet-mid {
  position: absolute;
  inset: 0;
  transform: translate(13px, 13px);
  background-color: var(--evergreen-2);
}

.sheet-front {
  position: relative;
  background-color: var(--white);
  border: 1px solid var(--line);
  box-shadow: 0 24px 60px rgba(20, 83, 45, 0.14);
  padding: clamp(32px, 6vw, 72px);
}

.hero-copy {
  max-width: 720px;
}

.hero-eyebrow {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--evergreen);
  margin-bottom: 20px;
}

.hero-copy h1 {
  font-size: clamp(2.2rem, 5.4vw, 3.8rem);
  letter-spacing: -0.03em;
  margin-bottom: 22px;
}

.hero-sub {
  font-size: 1.12rem;
  color: var(--muted);
  max-width: 640px;
  margin-bottom: 30px;
}

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

.hero-badges {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
  margin-top: 44px;
  padding-top: 32px;
  border-top: 1px solid var(--line);
}

.hero-badges li {
  display: flex;
  flex-direction: column;
}

.badge-value {
  font-size: 1.9rem;
  font-weight: 800;
  color: var(--evergreen);
  letter-spacing: -0.02em;
}

.badge-label {
  font-size: 0.82rem;
  color: var(--muted);
  font-weight: 600;
}

/* ============================================================
   STATEMENT — full width row
   ============================================================ */

.statement-section {
  background-color: var(--sage);
  padding: 88px 0;
}

.statement-kicker {
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--evergreen);
  margin-bottom: 16px;
}

.statement-title {
  font-size: clamp(1.9rem, 4.4vw, 3rem);
  letter-spacing: -0.02em;
  margin-bottom: 34px;
  max-width: 760px;
}

.statement-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
}

.statement-lead {
  font-size: 1.28rem;
  font-weight: 600;
  color: var(--evergreen);
}

.statement-grid p:not(.statement-lead) {
  color: var(--muted);
  font-size: 1.05rem;
}

/* ============================================================
   CAPABILITIES — numbered list
   ============================================================ */

.capabilities-section {
  background-color: var(--paper);
  padding: 96px 0;
}

.cap-list {
  display: flex;
  flex-direction: column;
}

.cap-item {
  display: grid;
  grid-template-columns: 90px 260px 1fr;
  gap: 28px;
  align-items: start;
  padding: 36px 0;
  border-top: 1px solid var(--line);
}

.cap-item:last-child {
  border-bottom: 1px solid var(--line);
}

.cap-num {
  font-size: 2rem;
  font-weight: 800;
  color: var(--evergreen);
  letter-spacing: -0.02em;
}

.cap-item h3 {
  font-size: 1.35rem;
}

.cap-item p {
  color: var(--muted);
}

/* ============================================================
   APPROACH — numbered steps
   ============================================================ */

.approach-section {
  background-color: var(--white);
  padding: 96px 0;
}

.approach-steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  counter-reset: none;
}

.step {
  border-top: 3px solid var(--evergreen);
  padding-top: 22px;
}

.step-head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 12px;
}

.step-num {
  font-size: 1rem;
  font-weight: 800;
  color: var(--evergreen);
}

.step h3 {
  font-size: 1.25rem;
}

.step p {
  color: var(--muted);
  font-size: 0.95rem;
}

/* ============================================================
   PLATFORMS — comparison table
   ============================================================ */

.platforms-section {
  background-color: var(--sage-2);
  padding: 96px 0;
}

.table-wrap {
  overflow-x: auto;
  border-radius: 10px;
  border: 1px solid var(--line);
  background-color: var(--white);
}

.compare-table {
  width: 100%;
  border-collapse: collapse;
  min-width: 640px;
}

.compare-table thead th {
  background-color: var(--evergreen);
  color: #FFFFFF;
  text-align: left;
  padding: 18px 22px;
  font-size: 0.95rem;
}

.compare-table thead th:first-child {
  width: 22%;
}

.compare-table tbody th,
.compare-table tbody td {
  padding: 18px 22px;
  border-top: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
  font-size: 0.94rem;
  color: var(--muted);
}

.compare-table tbody th {
  color: var(--ink);
  font-weight: 700;
  white-space: nowrap;
}

.compare-table tbody td:last-child {
  color: var(--evergreen);
  font-weight: 600;
}

/* ============================================================
   OUTCOMES — big numerals
   ============================================================ */

.outcomes-section {
  background-color: var(--paper);
  padding: 96px 0;
}

.outcome-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 28px;
}

.outcome {
  padding: 28px;
  background-color: var(--white);
  border: 1px solid var(--line);
  border-radius: 10px;
}

.outcome-num {
  display: block;
  font-size: 3rem;
  font-weight: 800;
  color: var(--evergreen);
  letter-spacing: -0.04em;
  margin-bottom: 14px;
  line-height: 1;
}

.outcome h3 {
  font-size: 1.2rem;
  margin-bottom: 10px;
}

.outcome p {
  color: var(--muted);
  font-size: 0.94rem;
}

/* ============================================================
   VOICES — testimonial slider
   ============================================================ */

.voices-section {
  background-color: var(--evergreen-dark);
  padding: 88px 0;
}

.voices-section .statement-kicker {
  color: var(--sage);
}

.slider {
  position: relative;
  min-height: 180px;
}

.slide {
  display: none;
}

.slide.is-active {
  display: block;
}

.slide blockquote {
  font-size: clamp(1.3rem, 2.6vw, 1.8rem);
  line-height: 1.4;
  color: #FFFFFF;
  font-weight: 600;
  letter-spacing: -0.01em;
  max-width: 820px;
  margin-bottom: 22px;
}

.slide cite {
  font-style: normal;
  color: var(--sage);
  font-weight: 600;
}

.slider-controls {
  display: flex;
  align-items: center;
  gap: 20px;
  margin-top: 30px;
}

.slider-btn {
  width: 46px;
  height: 46px;
  border-radius: 50%;
  border: 1px solid var(--sage);
  background-color: transparent;
  color: #FFFFFF;
  font-size: 1.1rem;
  cursor: pointer;
  transition: background-color 0.18s ease, color 0.18s ease;
}

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

.slider-dots {
  display: flex;
  gap: 8px;
}

.slider-dots button {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  border: none;
  background: rgba(231, 237, 223, 0.5);
  cursor: pointer;
  padding: 0;
  transition: opacity 0.18s ease, transform 0.18s ease;
}

.slider-dots button.is-active {
  opacity: 1;
  transform: scale(1.3);
  background-color: #FFFFFF;
}

/* ============================================================
   QUESTIONS — accordion
   ============================================================ */

.questions-section {
  background-color: var(--paper);
  padding: 96px 0;
}

.accordion {
  max-width: 820px;
}

.acc-item {
  border-bottom: 1px solid var(--line);
}

.acc-toggle {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: 22px 0;
  background: transparent;
  border: none;
  cursor: pointer;
  text-align: left;
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--ink);
}

.acc-toggle::after {
  content: "+";
  font-size: 1.5rem;
  font-weight: 400;
  color: var(--evergreen);
  transition: transform 0.2s ease;
}

.acc-item.open .acc-toggle::after {
  transform: rotate(45deg);
}

.acc-panel {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease;
}

.acc-panel p {
  padding-bottom: 22px;
  color: var(--muted);
  max-width: 700px;
}

/* ============================================================
   CONTACT
   ============================================================ */

.contact-section {
  background-color: var(--evergreen);
  padding: 96px 0;
  color: #FFFFFF;
}

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 56px;
  align-items: start;
}

.contact-info h2 {
  color: #FFFFFF;
  font-size: clamp(1.8rem, 3.4vw, 2.6rem);
  margin: 14px 0 18px;
  letter-spacing: -0.02em;
}

.contact-lede {
  color: var(--sage);
  max-width: 460px;
  margin-bottom: 30px;
  font-size: 1.02rem;
}

.contact-details {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.contact-details li {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.cd-label {
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--sage);
}

.contact-details a,
.contact-details span {
  color: #FFFFFF;
  font-weight: 600;
}

.contact-details a:hover {
  text-decoration: underline;
}

.contact-form {
  background-color: var(--white);
  color: var(--ink);
  border-radius: 10px;
  padding: 34px;
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.22);
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.field {
  margin-bottom: 16px;
}

.field label {
  display: block;
  font-size: 0.85rem;
  font-weight: 700;
  margin-bottom: 6px;
  color: var(--ink);
}

.field input,
.field textarea {
  width: 100%;
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: 6px;
  font-size: 1rem;
  font-family: inherit;
  color: var(--ink);
  background-color: #FBFCFA;
  transition: border-color 0.18s ease, box-shadow 0.18s ease;
}

.field input:focus,
.field textarea:focus {
  outline: none;
  border-color: var(--evergreen);
  box-shadow: 0 0 0 3px var(--sage);
}

.form-note {
  margin-top: 12px;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--evergreen);
  min-height: 1.2em;
}

/* ============================================================
   FOOTER
   ============================================================ */

.site-footer {
  background-color: var(--evergreen-dark);
  color: #FFFFFF;
}

.newsletter-band {
  border-bottom: 1px solid rgba(255, 255, 255, 0.14);
  padding: 48px 0;
}

.newsletter-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  align-items: center;
}

.newsletter-grid h2 {
  color: #FFFFFF;
  font-size: 1.6rem;
  margin-bottom: 8px;
}

.newsletter-grid p {
  color: var(--sage);
}

.newsletter-form {
  display: flex;
  gap: 12px;
}

.newsletter-form input {
  flex: 1;
  padding: 12px 16px;
  border: 1px solid #7C9A83;
  border-radius: 6px;
  background-color: #234E33;
  color: #FFFFFF;
  font-size: 1rem;
}

.newsletter-form input::placeholder {
  color: var(--sage);
}

.newsletter-form input:focus {
  outline: none;
  border-color: #FFFFFF;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr 1.4fr;
  gap: 40px;
  padding-top: 56px;
  padding-bottom: 48px;
}

.footer-brand p {
  color: var(--sage);
  margin-top: 18px;
  max-width: 340px;
  font-size: 0.95rem;
}

.brand-footer .brand-text {
  color: #FFFFFF;
}

.footer-col h3 {
  color: #FFFFFF;
  font-size: 0.85rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 18px;
}

.footer-col ul {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-col a,
.footer-col span {
  color: var(--sage);
  font-size: 0.95rem;
}

.footer-col a:hover {
  color: #FFFFFF;
  text-decoration: underline;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.14);
  padding: 22px 0;
}

.footer-bottom-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

.footer-bottom p {
  color: var(--sage);
  font-size: 0.88rem;
}

.footer-legal-links {
  display: flex;
  gap: 22px;
}

.footer-legal-links a {
  color: var(--sage);
}

.footer-legal-links a:hover {
  color: #FFFFFF;
  text-decoration: underline;
}

/* ============================================================
   SCROLL REVEAL
   ============================================================ */

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

.fade-up.visible {
  opacity: 1;
  transform: none;
}

/* ============================================================
   RESPONSIVE
   ============================================================ */

@media (max-width: 960px) {
  .statement-grid,
  .contact-grid,
  .newsletter-grid {
    grid-template-columns: 1fr;
  }

  .approach-steps {
    grid-template-columns: 1fr 1fr;
  }

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

  .cap-item {
    grid-template-columns: 70px 1fr;
  }

  .cap-item p {
    grid-column: 2;
  }

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

@media (max-width: 720px) {
  .nav-toggle {
    display: flex;
  }

  .nav-links {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background-color: var(--paper);
    border-bottom: 1px solid var(--line);
    padding: 0 24px;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
  }

  .ruler-nav.open .nav-links {
    max-height: 420px;
  }

  .nav-links li {
    border-bottom: 1px solid var(--line);
  }

  .nav-links a {
    display: block;
    padding: 14px 0;
  }

  .nav-links a::after {
    display: none;
  }

  .nav-cta {
    display: none;
  }

  .sheet-back {
    transform: translate(14px, 14px);
  }

  .sheet-mid {
    transform: translate(7px, 7px);
  }

  .hero-badges {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .cap-item {
    grid-template-columns: 1fr;
    gap: 10px;
  }

  .cap-item p {
    grid-column: auto;
  }

  .approach-steps {
    grid-template-columns: 1fr;
  }

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

  .form-row {
    grid-template-columns: 1fr;
  }

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

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

  .compare-table {
    min-width: 520px;
  }
}