/* ============================================================
   Zhou Gui Bei — Professional Website Stylesheet
   Palette: Obsidian & Amber
   Mobile-first, CSS custom properties, no rgba() text colors
   ============================================================ */

/* ---- CSS Custom Properties ---- */
:root {
  /* Palette */
  --clr-deep:        #0b1119;
  --clr-surface:     #151d28;
  --clr-accent:      #c8843c;
  --clr-accent-bright:#e8a74a;
  --clr-accent-pale: #f5e6d3;
  --clr-bg:          #faf8f5;
  --clr-card:        #ffffff;
  --clr-text:        #16140e;
  --clr-heading:     #0b1119;
  --clr-muted:       #6e6a62;
  --clr-border:      #e8e3da;
  --clr-success:     #2d8c6e;
  --clr-error:       #c44536;

  /* Typography */
  --ff-body:   'Segoe UI', system-ui, -apple-system, sans-serif;
  --ff-heading: 'Segoe UI', system-ui, -apple-system, sans-serif;
  --fs-xs:     0.75rem;
  --fs-sm:     0.875rem;
  --fs-base:   1rem;
  --fs-lg:     1.125rem;
  --fs-xl:     1.25rem;
  --fs-2xl:    1.5rem;
  --fs-3xl:    1.875rem;
  --fs-4xl:    2.25rem;
  --fs-5xl:    3rem;

  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  --space-4xl: 6rem;

  /* Layout */
  --max-width: 1200px;
  --nav-height: 4.5rem;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 2px 0 #0b111914;
  --shadow-md: 0 4px 12px 0 #0b111910;
  --shadow-lg: 0 12px 40px 0 #0b111912;
  --shadow-xl: 0 20px 60px 0 #0b111918;

  /* Transitions */
  --ease: cubic-bezier(0.4, 0, 0.2, 1);
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
}

/* ---- Reset & Base ---- */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

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

body {
  font-family: var(--ff-body);
  font-size: var(--fs-base);
  line-height: 1.7;
  color: var(--clr-text);
  background: var(--clr-bg);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

a {
  color: var(--clr-accent);
  text-decoration: none;
  transition: color 0.25s var(--ease);
}
a:hover {
  color: var(--clr-accent-bright);
}

ul { list-style: none; }

h1, h2, h3, h4, h5, h6 {
  font-family: var(--ff-heading);
  line-height: 1.25;
  color: var(--clr-heading);
  font-weight: 700;
}

h1 { font-size: clamp(2rem, 5vw, var(--fs-5xl)); }
h2 { font-size: clamp(1.5rem, 3.5vw, var(--fs-4xl)); }
h3 { font-size: clamp(1.125rem, 2vw, var(--fs-2xl)); }

.section-label {
  display: inline-block;
  font-size: var(--fs-sm);
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--clr-accent);
  margin-bottom: var(--space-md);
}

/* ---- Utility ---- */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--space-lg);
  padding-right: var(--space-lg);
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 0.85rem 1.75rem;
  font-size: var(--fs-base);
  font-weight: 600;
  font-family: var(--ff-body);
  border: 2px solid transparent;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all 0.3s var(--ease);
  text-align: center;
  justify-content: center;
  letter-spacing: 0.01em;
}
.btn-primary {
  background: var(--clr-accent);
  color: #ffffff;
  border-color: var(--clr-accent);
}
.btn-primary:hover {
  background: var(--clr-accent-bright);
  border-color: var(--clr-accent-bright);
  color: #ffffff;
  transform: translateY(-2px);
  box-shadow: 0 8px 24px #c8843c40;
}
.btn-outline {
  background: transparent;
  color: var(--clr-accent);
  border-color: var(--clr-accent);
}
.btn-outline:hover {
  background: var(--clr-accent);
  color: #ffffff;
  transform: translateY(-2px);
}

/* ---- Navigation ---- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--nav-height);
  background: #0b1119f2;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid #ffffff10;
  z-index: 1000;
  transition: background 0.3s var(--ease);
}
.nav .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}
.nav-logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: var(--fs-xl);
  font-weight: 800;
  color: #ffffff;
  letter-spacing: -0.01em;
  text-decoration: none;
}
.nav-logo:hover { color: var(--clr-accent-bright); }
.nav-logo-zh {
  font-size: var(--fs-lg);
  color: var(--clr-accent);
  font-weight: 700;
}
.nav-links {
  display: flex;
  gap: var(--space-xl);
  align-items: center;
}
.nav-links a {
  color: #c0c4cc;
  font-size: var(--fs-sm);
  font-weight: 500;
  transition: color 0.25s var(--ease);
  padding: var(--space-xs) 0;
  position: relative;
}
.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--clr-accent);
  transition: width 0.3s var(--ease);
}
.nav-links a:hover,
.nav-links a:focus {
  color: #ffffff;
}
.nav-links a:hover::after,
.nav-links a:focus::after {
  width: 100%;
}
.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-xs);
  color: #ffffff;
}
.nav-toggle span {
  display: block;
  width: 26px;
  height: 2px;
  background: #ffffff;
  margin: 6px 0;
  transition: all 0.3s var(--ease);
  border-radius: 2px;
}
.nav-toggle.active span:nth-child(1) {
  transform: rotate(45deg) translate(6px, 6px);
}
.nav-toggle.active span:nth-child(2) {
  opacity: 0;
}
.nav-toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

@media (max-width: 768px) {
  .nav-toggle { display: block; position: relative; z-index: 1001; }
  .nav-links {
    position: fixed;
    top: 0;
    right: -100%;
    width: 80%;
    max-width: 360px;
    height: 100vh;
    background: var(--clr-surface);
    flex-direction: column;
    justify-content: center;
    gap: var(--space-xl);
    padding: var(--space-3xl);
    transition: right 0.4s var(--ease);
    box-shadow: var(--shadow-xl);
  }
  .nav-links.open { right: 0; }
  .nav-links a { font-size: var(--fs-lg); }
}

/* ---- Hero ---- */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  background: linear-gradient(160deg, #0b1119 0%, #111d30 35%, #0d1725 70%, #0b1119 100%);
  overflow: hidden;
  padding-top: var(--nav-height);
}
.hero::before {
  content: '';
  position: absolute;
  top: -40%;
  right: -20%;
  width: 800px;
  height: 800px;
  background: radial-gradient(circle, #c8843c14 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}
.hero::after {
  content: '';
  position: absolute;
  bottom: -30%;
  left: -10%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, #c8843c0a 0%, transparent 65%);
  border-radius: 50%;
  pointer-events: none;
}
.hero-geo {
  position: absolute;
  right: 5%;
  top: 50%;
  transform: translateY(-50%);
  width: 45%;
  max-width: 560px;
  opacity: 0.35;
  pointer-events: none;
}
.hero-geo svg { width: 100%; height: auto; }

.hero .container {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3xl);
  align-items: center;
}
.hero-content {
  max-width: 600px;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  background: #c8843c18;
  border: 1px solid #c8843c30;
  color: var(--clr-accent-bright);
  padding: 0.4rem 1rem;
  border-radius: var(--radius-full);
  font-size: var(--fs-sm);
  font-weight: 600;
  letter-spacing: 0.04em;
  margin-bottom: var(--space-xl);
}
.hero-badge-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--clr-accent-bright);
  animation: pulse-dot 2s infinite;
}
@keyframes pulse-dot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(1.8); }
}
.hero h1 {
  color: #ffffff;
  margin-bottom: var(--space-lg);
  line-height: 1.15;
}
.hero h1 .highlight {
  background: linear-gradient(135deg, var(--clr-accent-bright), var(--clr-accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero p {
  color: #a0a8b8;
  font-size: var(--fs-lg);
  margin-bottom: var(--space-2xl);
  max-width: 480px;
  line-height: 1.7;
}
.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md);
}

.hero-visual {
  display: flex;
  align-items: center;
  justify-content: center;
}
.hero-visual svg { width: 100%; max-width: 480px; height: auto; }

@media (max-width: 900px) {
  .hero .container { grid-template-columns: 1fr; }
  .hero-visual { display: none; }
  .hero-content { text-align: center; max-width: 100%; }
  .hero p { max-width: 100%; }
  .hero-actions { justify-content: center; }
}

/* ---- Services ---- */
.services {
  padding: var(--space-4xl) 0;
  background: var(--clr-bg);
}
.services-header {
  text-align: center;
  max-width: 700px;
  margin: 0 auto var(--space-3xl);
}
.services-header h2 { margin-bottom: var(--space-md); }
.services-header p { color: var(--clr-muted); font-size: var(--fs-lg); }

.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--space-xl);
}

.service-card {
  background: var(--clr-card);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-lg);
  padding: var(--space-2xl);
  transition: all 0.35s var(--ease);
  position: relative;
  overflow: hidden;
}
.service-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: linear-gradient(90deg, var(--clr-accent), var(--clr-accent-bright));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.35s var(--ease);
}
.service-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: #c8843c30;
}
.service-card:hover::before { transform: scaleX(1); }

.service-icon {
  width: 56px;
  height: 56px;
  background: var(--clr-accent-pale);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-lg);
  font-size: 1.5rem;
  color: var(--clr-accent);
}
.service-card h3 {
  font-size: var(--fs-xl);
  margin-bottom: var(--space-sm);
}
.service-card p {
  color: var(--clr-muted);
  font-size: var(--fs-base);
  line-height: 1.7;
}

/* ---- About ---- */
.about {
  padding: var(--space-4xl) 0;
  background: var(--clr-card);
  border-top: 1px solid var(--clr-border);
  border-bottom: 1px solid var(--clr-border);
}
.about .container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3xl);
  align-items: center;
}
.about-visual {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
}
.about-badge {
  position: absolute;
  bottom: 10%;
  right: 5%;
  background: var(--clr-surface);
  color: #ffffff;
  padding: var(--space-lg);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  text-align: center;
  min-width: 120px;
}
.about-badge-num {
  font-size: var(--fs-3xl);
  font-weight: 800;
  color: var(--clr-accent-bright);
  line-height: 1;
}
.about-badge-label {
  font-size: var(--fs-xs);
  color: #a0a8b8;
  margin-top: var(--space-xs);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}
.about-content h2 { margin-bottom: var(--space-lg); }
.about-content p {
  color: var(--clr-muted);
  margin-bottom: var(--space-md);
  line-height: 1.8;
}
.about-features {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-md);
  margin-top: var(--space-xl);
}
.about-feature {
  display: flex;
  align-items: flex-start;
  gap: var(--space-sm);
}
.about-feature-icon {
  color: var(--clr-accent);
  font-size: 1.25rem;
  flex-shrink: 0;
  margin-top: 2px;
}
.about-feature-text strong {
  display: block;
  font-size: var(--fs-sm);
  color: var(--clr-heading);
}
.about-feature-text span {
  font-size: var(--fs-sm);
  color: var(--clr-muted);
}

@media (max-width: 900px) {
  .about .container { grid-template-columns: 1fr; }
  .about-visual { order: -1; }
}

/* ---- Process ---- */
.process {
  padding: var(--space-4xl) 0;
  background: var(--clr-bg);
}
.process-header {
  text-align: center;
  max-width: 650px;
  margin: 0 auto var(--space-3xl);
}
.process-header h2 { margin-bottom: var(--space-md); }
.process-header p { color: var(--clr-muted); font-size: var(--fs-lg); }

.process-steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: var(--space-xl);
  counter-reset: process;
}
.process-step {
  text-align: center;
  position: relative;
  padding: var(--space-2xl) var(--space-lg);
}
.process-step::before {
  counter-increment: process;
  content: counter(process, decimal-leading-zero);
  display: flex;
  align-items: center;
  justify-content: center;
  width: 64px;
  height: 64px;
  margin: 0 auto var(--space-lg);
  border-radius: 50%;
  background: linear-gradient(135deg, var(--clr-accent), var(--clr-accent-bright));
  color: #ffffff;
  font-size: var(--fs-xl);
  font-weight: 800;
  letter-spacing: 0.02em;
}
.process-step h3 {
  font-size: var(--fs-lg);
  margin-bottom: var(--space-sm);
}
.process-step p {
  font-size: var(--fs-sm);
  color: var(--clr-muted);
  line-height: 1.6;
}

/* ---- Industries ---- */
.industries {
  padding: var(--space-4xl) 0;
  background: var(--clr-surface);
  color: #ffffff;
}
.industries-header {
  text-align: center;
  max-width: 650px;
  margin: 0 auto var(--space-3xl);
}
.industries-header .section-label { color: var(--clr-accent-bright); }
.industries-header h2 { color: #ffffff; margin-bottom: var(--space-md); }
.industries-header p { color: #a0a8b8; font-size: var(--fs-lg); }

.industries-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: var(--space-lg);
}
.industry-card {
  background: #1a2538;
  border: 1px solid #ffffff08;
  border-radius: var(--radius-md);
  padding: var(--space-2xl) var(--space-lg);
  text-align: center;
  transition: all 0.3s var(--ease);
}
.industry-card:hover {
  background: #202d42;
  border-color: #c8843c30;
  transform: translateY(-4px);
}
.industry-icon {
  font-size: 2.25rem;
  margin-bottom: var(--space-md);
}
.industry-card h3 {
  font-size: var(--fs-base);
  color: #ffffff;
  margin-bottom: var(--space-xs);
}
.industry-card p {
  font-size: var(--fs-sm);
  color: #8892a4;
}

/* ---- Stats ---- */
.stats {
  padding: var(--space-3xl) 0;
  background: linear-gradient(135deg, var(--clr-accent) 0%, var(--clr-accent-bright) 100%);
}
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: var(--space-xl);
  text-align: center;
}
.stat-item {
  padding: var(--space-lg);
}
.stat-number {
  font-size: clamp(2rem, 4vw, var(--fs-5xl));
  font-weight: 800;
  color: #ffffff;
  line-height: 1;
  margin-bottom: var(--space-xs);
}
.stat-label {
  font-size: var(--fs-sm);
  color: #f5e6d3;
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}
.stat-suffix {
  font-size: var(--fs-2xl);
  color: #ffffff;
  font-weight: 800;
}

/* ---- Contact ---- */
.contact {
  padding: var(--space-4xl) 0;
  background: var(--clr-bg);
}
.contact .container {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: var(--space-3xl);
}
.contact-info h2 { margin-bottom: var(--space-lg); }
.contact-info > p {
  color: var(--clr-muted);
  margin-bottom: var(--space-2xl);
  line-height: 1.7;
}
.contact-detail {
  display: flex;
  align-items: flex-start;
  gap: var(--space-md);
  margin-bottom: var(--space-lg);
}
.contact-detail-icon {
  width: 44px;
  height: 44px;
  background: var(--clr-accent-pale);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  font-size: 1.1rem;
  color: var(--clr-accent);
}
.contact-detail strong {
  display: block;
  font-size: var(--fs-sm);
  color: var(--clr-heading);
}
.contact-detail span {
  font-size: var(--fs-sm);
  color: var(--clr-muted);
}

.contact-form {
  background: var(--clr-card);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-lg);
  padding: var(--space-2xl);
}
.form-group {
  margin-bottom: var(--space-lg);
}
.form-group label {
  display: block;
  font-size: var(--fs-sm);
  font-weight: 600;
  color: var(--clr-heading);
  margin-bottom: var(--space-xs);
}
.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 0.75rem 1rem;
  font-size: var(--fs-base);
  font-family: var(--ff-body);
  color: var(--clr-text);
  background: var(--clr-bg);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-sm);
  transition: all 0.25s var(--ease);
  outline: none;
}
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  border-color: var(--clr-accent);
  box-shadow: 0 0 0 3px #c8843c18;
}
.form-group textarea { resize: vertical; min-height: 120px; }
.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-md);
}
.form-status {
  margin-top: var(--space-md);
  font-size: var(--fs-sm);
  font-weight: 600;
  display: none;
}
.form-status.success { color: var(--clr-success); display: block; }
.form-status.error { color: var(--clr-error); display: block; }

@media (max-width: 768px) {
  .contact .container { grid-template-columns: 1fr; }
  .form-row { grid-template-columns: 1fr; }
}

/* ---- CTA ---- */
.cta {
  padding: var(--space-4xl) 0;
  background: var(--clr-surface);
  text-align: center;
  position: relative;
  overflow: hidden;
}
.cta::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at center, #c8843c10 0%, transparent 70%);
  pointer-events: none;
}
.cta h2 {
  color: #ffffff;
  margin-bottom: var(--space-md);
}
.cta p {
  color: #a0a8b8;
  font-size: var(--fs-lg);
  margin-bottom: var(--space-xl);
  max-width: 500px;
  margin-left: auto;
  margin-right: auto;
}

/* ---- Footer ---- */
.footer {
  background: var(--clr-deep);
  color: #8892a4;
  padding: var(--space-3xl) 0 var(--space-lg);
  border-top: 1px solid #ffffff0a;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--space-2xl);
  margin-bottom: var(--space-2xl);
}
.footer-brand p {
  font-size: var(--fs-sm);
  line-height: 1.7;
  margin-top: var(--space-md);
  color: #8892a4;
}
.footer-col h4 {
  color: #ffffff;
  font-size: var(--fs-sm);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: var(--space-lg);
}
.footer-col a {
  display: block;
  color: #8892a4;
  font-size: var(--fs-sm);
  padding: var(--space-xs) 0;
  transition: color 0.25s var(--ease);
}
.footer-col a:hover { color: var(--clr-accent-bright); }

.footer-bottom {
  border-top: 1px solid #ffffff0a;
  padding-top: var(--space-lg);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: var(--fs-sm);
  color: #667088;
  flex-wrap: wrap;
  gap: var(--space-md);
}
.footer-bottom a {
  color: #667088;
  font-size: var(--fs-sm);
}
.footer-bottom a:hover { color: var(--clr-accent-bright); }
.footer-bottom-links {
  display: flex;
  gap: var(--space-lg);
}

@media (max-width: 768px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .footer-bottom { flex-direction: column; text-align: center; }
}
@media (max-width: 480px) {
  .footer-grid { grid-template-columns: 1fr; }
}

/* ---- Policy / Terms Pages ---- */
.policy-page {
  padding: calc(var(--nav-height) + var(--space-3xl)) 0 var(--space-4xl);
  background: var(--clr-bg);
  min-height: 100vh;
}
.policy-page .container {
  max-width: 800px;
}
.policy-page h1 {
  font-size: var(--fs-4xl);
  margin-bottom: var(--space-sm);
}
.policy-page .policy-date {
  font-size: var(--fs-sm);
  color: var(--clr-muted);
  margin-bottom: var(--space-2xl);
}
.policy-page article h2 {
  font-size: var(--fs-2xl);
  margin-top: var(--space-2xl);
  margin-bottom: var(--space-md);
  padding-top: var(--space-lg);
  border-top: 1px solid var(--clr-border);
}
.policy-page article h3 {
  font-size: var(--fs-lg);
  margin-top: var(--space-lg);
  margin-bottom: var(--space-sm);
}
.policy-page article p,
.policy-page article li {
  font-size: var(--fs-base);
  color: var(--clr-text);
  line-height: 1.8;
  margin-bottom: var(--space-md);
}
.policy-page article ul,
.policy-page article ol {
  padding-left: var(--space-xl);
  list-style: disc;
  margin-bottom: var(--space-lg);
}
.policy-page article ol { list-style: decimal; }
.policy-page article li { margin-bottom: var(--space-sm); }
.policy-page article strong {
  color: var(--clr-heading);
}

/* ---- Animations ---- */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: all 0.7s var(--ease);
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ---- Scroll-to-top ---- */
.scroll-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 44px;
  height: 44px;
  background: var(--clr-accent);
  color: #ffffff;
  border: none;
  border-radius: 50%;
  cursor: pointer;
  font-size: 1.25rem;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-md);
  opacity: 0;
  pointer-events: none;
  transform: translateY(10px);
  transition: all 0.3s var(--ease);
  z-index: 900;
}
.scroll-top.visible {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}
.scroll-top:hover {
  background: var(--clr-accent-bright);
  transform: translateY(-3px);
}

/* ---- Mobile-only utilities ---- */
@media (max-width: 480px) {
  .hide-mobile { display: none !important; }
}