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

:root {
  --wa-green: #a1a1aa;
  --wa-green-hover: #c4c4cd;
  --wa-green-dim: rgba(161, 161, 170, 0.1);
  --wa-green-glow: rgba(161, 161, 170, 0.25);
  --wa-sidebar: #131316;
  --wa-top-bar: #131316;
  --wa-chat: #0b0b0e;
  --wa-primary: #ededf0;
  --wa-secondary: #9a9aa3;
  --wa-border: #26262d;
  --wa-input: #1b1b1f;
  --wa-danger: #ef5350;
  --wa-warning: #ffa726;
  --bg-body: #0b0b0e;
  --bg-card: #131316;
  --bg-elevated: #1d1d22;
  --text-primary: #ededf0;
  --text-secondary: #9a9aa3;
  --text-muted: #71717a;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 4px 24px rgba(0, 0, 0, 0.55);
  --transition: 0.25s ease;
  --max-width: 1200px;
  --font: 'Segoe UI', system-ui, -apple-system, sans-serif;
}

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

body {
  font-family: var(--font);
  background: var(--bg-body);
  color: var(--text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

::selection {
  background: var(--wa-green);
  color: #fff;
}

a {
  color: var(--wa-green);
  text-decoration: none;
  transition: color var(--transition);
}

a:hover {
  color: var(--wa-green-hover);
}

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

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

/* --- Navbar --- */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(11, 20, 26, 0.92);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--wa-border);
  height: 64px;
}

.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.navbar .logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text-primary);
}

.navbar .logo .logo-icon {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.navbar .logo .logo-icon img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 8px;
  list-style: none;
}

.nav-links a {
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: all var(--transition);
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--text-primary);
  background: var(--wa-green-dim);
}

.nav-links a.nav-chat-btn {
  background: var(--wa-green);
  color: var(--wa-chat) !important;
  font-weight: 600;
  padding: 6px 14px;
  border-radius: var(--radius-sm);
  transition: all var(--transition);
}

.nav-links a.nav-chat-btn:hover {
  background: var(--wa-green-hover);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px var(--wa-green-glow);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  background: none;
  border: none;
  padding: 4px;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: all var(--transition);
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition: all var(--transition);
  text-decoration: none;
}

.btn-primary {
  background: var(--wa-green);
  color: #fff;
}

.btn-primary:hover {
  background: var(--wa-green-hover);
  transform: translateY(-1px);
  box-shadow: 0 4px 20px var(--wa-green-glow);
}

.btn-secondary {
  background: transparent;
  color: var(--text-primary);
  border: 1px solid var(--wa-border);
}

.btn-secondary:hover {
  border-color: var(--wa-green);
  color: var(--wa-green);
}

.btn-sm {
  padding: 8px 18px;
  font-size: 0.85rem;
}

/* --- Sections --- */
section {
  padding: 100px 0;
}

.section-label {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 2px;
  color: var(--wa-green);
  margin-bottom: 12px;
}

.section-title {
  font-size: 2.25rem;
  font-weight: 800;
  line-height: 1.25;
  margin-bottom: 16px;
}

.section-subtitle {
  font-size: 1.1rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin-bottom: 40px;
}

/* --- Hero --- */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: 64px;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -30%;
  right: -20%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, var(--wa-green-dim) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}

.hero::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 300px;
  background: url('../assets/banner.png') center/cover no-repeat;
  opacity: 0.08;
  pointer-events: none;
}

.hero .container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.hero-content h1 {
  font-size: 3.5rem;
  font-weight: 900;
  line-height: 1.1;
  margin-bottom: 20px;
}

.hero-content h1 span {
  color: var(--wa-green);
}

.hero-content p {
  font-size: 1.15rem;
  color: var(--text-secondary);
  margin-bottom: 32px;
  max-width: 520px;
}

.hero-buttons {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.hero-visual {
  display: flex;
  justify-content: center;
  align-items: center;
}

.hero-card {
  background: var(--bg-card);
  border: 1px solid var(--wa-border);
  border-radius: var(--radius);
  padding: 32px;
  width: 100%;
  max-width: 480px;
  box-shadow: var(--shadow);
}

.hero-card .mock-header {
  display: flex;
  align-items: center;
  gap: 12px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--wa-border);
  margin-bottom: 20px;
}

.hero-card .mock-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--wa-green);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1rem;
  color: #fff;
  flex-shrink: 0;
}

.hero-card .mock-name {
  font-weight: 600;
  font-size: 0.95rem;
}

.hero-card .mock-status {
  font-size: 0.8rem;
  color: var(--wa-green);
}

.hero-card .mock-message {
  background: var(--wa-green-dim);
  padding: 10px 16px;
  border-radius: 8px;
  margin-bottom: 8px;
  max-width: 80%;
  font-size: 0.9rem;
}

.hero-card .mock-message.outgoing {
  margin-left: auto;
  background: var(--wa-input);
}

.hero-card .mock-time {
  font-size: 0.7rem;
  color: var(--text-muted);
  text-align: right;
  margin-top: 2px;
}

.hero-card .mock-input {
  display: flex;
  gap: 8px;
  margin-top: 20px;
  padding-top: 16px;
  border-top: 1px solid var(--wa-border);
}

.hero-card .mock-input span {
  flex: 1;
  background: var(--wa-input);
  border-radius: 8px;
  padding: 10px 14px;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.hero-card .mock-input .mock-send {
  width: 40px;
  height: 40px;
  background: var(--wa-green);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

/* --- Features / Grids --- */
.grid-3,
.grid-4 {
  display: grid;
  gap: 24px;
}

.grid-3 {
  grid-template-columns: repeat(3, 1fr);
}

.grid-4 {
  grid-template-columns: repeat(4, 1fr);
}

.feature-card,
.security-card,
.step-card {
  background: var(--bg-card);
  border: 1px solid var(--wa-border);
  border-radius: var(--radius);
  padding: 28px;
  transition: all var(--transition);
}

.feature-card:hover,
.security-card:hover {
  border-color: var(--wa-green);
  transform: translateY(-3px);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
}

.feature-card .icon,
.security-card .icon,
.step-card .step-num {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-sm);
  background: var(--wa-green-dim);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
}

.feature-card .icon svg,
.security-card .icon svg {
  width: 24px;
  height: 24px;
  stroke: var(--wa-green);
  fill: none;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.feature-card h3,
.security-card h3 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.feature-card p,
.security-card p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* --- How it works --- */
.step-card {
  text-align: center;
  padding: 36px 24px;
}

.step-card .step-num {
  margin: 0 auto 16px;
  background: var(--wa-green);
  color: #fff;
  font-weight: 700;
  font-size: 1.2rem;
}

.step-card h3 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.step-card p {
  font-size: 0.9rem;
  color: var(--text-secondary);
}

/* --- Security Spotlight --- */
.security-spotlight {
  background: var(--bg-card);
  border: 1px solid var(--wa-green);
  border-radius: var(--radius);
  padding: 48px;
  margin-top: 40px;
  position: relative;
  overflow: hidden;
}

.security-spotlight::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--wa-green);
}

.security-spotlight .spotlight-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 24px;
}

.security-spotlight .spotlight-header svg {
  width: 28px;
  height: 28px;
  stroke: var(--wa-green);
  fill: none;
  stroke-width: 2;
}

.security-spotlight h3 {
  font-size: 1.25rem;
  font-weight: 700;
}

.security-spotlight p {
  color: var(--text-secondary);
  margin-bottom: 24px;
  max-width: 700px;
}

.security-spotlight .badge-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 600;
  background: var(--wa-green-dim);
  color: var(--wa-green);
  border: 1px solid transparent;
}

.badge-outline {
  background: transparent;
  border-color: var(--wa-border);
  color: var(--text-secondary);
}

/* --- Tech Stack --- */
.tech-strip {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 16px;
  margin-top: 20px;
}

.tech-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  background: var(--bg-card);
  border: 1px solid var(--wa-border);
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.tech-item .dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--wa-green);
  flex-shrink: 0;
}

/* --- Page Header --- */
.page-header {
  padding: 140px 0 60px;
  text-align: center;
}

.page-header h1 {
  font-size: 2.75rem;
  font-weight: 900;
  margin-bottom: 12px;
}

.page-header p {
  color: var(--text-secondary);
  font-size: 1.1rem;
  max-width: 600px;
  margin: 0 auto;
}

/* --- Content Page --- */
.content-page {
  padding: 0 0 80px;
}

.content-page .container {
  max-width: 840px;
}

.content-page h2 {
  font-size: 1.6rem;
  font-weight: 700;
  margin: 40px 0 16px;
  color: var(--text-primary);
}

.content-page h3 {
  font-size: 1.2rem;
  font-weight: 600;
  margin: 28px 0 12px;
  color: var(--wa-green);
}

.content-page p {
  margin-bottom: 16px;
  color: var(--text-secondary);
  line-height: 1.8;
}

.content-page ul,
.content-page ol {
  margin: 12px 0 20px 24px;
  color: var(--text-secondary);
  line-height: 1.8;
}

.content-page li {
  margin-bottom: 8px;
}

.content-page strong {
  color: var(--text-primary);
}

.content-page .highlight-box {
  background: var(--bg-elevated);
  border-left: 4px solid var(--wa-green);
  padding: 20px 24px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin: 24px 0;
}

.content-page .highlight-box p {
  margin-bottom: 0;
  color: var(--text-primary);
}

/* --- Table of Contents --- */
.toc {
  background: var(--bg-card);
  border: 1px solid var(--wa-border);
  border-radius: var(--radius);
  padding: 24px 28px;
  margin-bottom: 40px;
}

.toc h3 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--text-primary);
}

.toc ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.toc li {
  margin-bottom: 6px;
}

.toc a {
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.toc a:hover {
  color: var(--wa-green);
}

/* --- Guide specific --- */
.guide-step {
  display: grid;
  grid-template-columns: 48px 1fr;
  gap: 16px;
  margin-bottom: 32px;
}

.guide-step .step-number {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--wa-green);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1.1rem;
  flex-shrink: 0;
}

.guide-step .step-content h4 {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 6px;
}

.guide-step .step-content p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  margin-bottom: 4px;
}

/* --- Footer --- */
footer {
  border-top: 1px solid var(--wa-border);
  padding: 48px 0 32px;
}

footer .container {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
}

footer .brand p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-top: 12px;
}

footer h4 {
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--text-muted);
  margin-bottom: 16px;
}

footer ul {
  list-style: none;
}

footer li {
  margin-bottom: 10px;
}

footer a {
  font-size: 0.9rem;
  color: var(--text-secondary);
}

footer a:hover {
  color: var(--wa-green);
}

.footer-bottom {
  margin-top: 40px;
  padding-top: 20px;
  border-top: 1px solid var(--wa-border);
  text-align: center;
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* --- Page Transition --- */
#page-wrap {
  transition: opacity 0.5s ease, transform 0.5s ease;
}

#page-wrap.page-fade {
  opacity: 0;
  transform: translateY(20px);
}

/* --- Responsive --- */
/* --- Scroll Animation --- */
.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

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

/* --- Comparison Table --- */
.comparison-wrapper {
  overflow-x: auto;
  margin-top: 32px;
}

.comparison-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
  min-width: 600px;
}

.comparison-table thead th {
  padding: 16px 20px;
  text-align: left;
  font-weight: 700;
  background: var(--bg-card);
  border-bottom: 2px solid var(--wa-border);
  color: var(--text-primary);
}

.comparison-table thead th:first-child {
  border-radius: var(--radius-sm) 0 0 0;
}

.comparison-table thead th:last-child {
  border-radius: 0 var(--radius-sm) 0 0;
}

.comparison-table thead th.highlight {
  color: var(--wa-green);
}

.comparison-table tbody td {
  padding: 14px 20px;
  border-bottom: 1px solid var(--wa-border);
  color: var(--text-secondary);
}

.comparison-table tbody tr:hover {
  background: var(--wa-green-dim);
}

.comparison-table tbody td:first-child {
  font-weight: 600;
  color: var(--text-primary);
}

.comparison-table .check {
  color: var(--wa-green);
  font-weight: 700;
}

.comparison-table .cross {
  color: var(--text-muted);
}

/* --- CTA Banner --- */
.cta-banner {
  background: linear-gradient(135deg, var(--bg-card) 0%, var(--bg-elevated) 100%);
  border: 1px solid var(--wa-green);
  border-radius: var(--radius);
  padding: 60px;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.cta-banner::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -20%;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, var(--wa-green-dim) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}

.cta-banner h2 {
  font-size: 2rem;
  font-weight: 800;
  margin-bottom: 12px;
  position: relative;
}

.cta-banner p {
  color: var(--text-secondary);
  font-size: 1.05rem;
  margin-bottom: 28px;
  max-width: 500px;
  margin-left: auto;
  margin-right: auto;
  position: relative;
}

.cta-banner .btn {
  position: relative;
}

/* --- Testimonials --- */
.testimonial-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.testimonial-card {
  background: var(--bg-card);
  border: 1px solid var(--wa-border);
  border-radius: var(--radius);
  padding: 28px;
  transition: all var(--transition);
}

.testimonial-card:hover {
  border-color: var(--wa-green);
  transform: translateY(-3px);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
}

.testimonial-card .stars {
  color: var(--wa-warning);
  font-size: 0.9rem;
  margin-bottom: 12px;
  letter-spacing: 2px;
}

.testimonial-card blockquote {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 16px;
  font-style: italic;
}

.testimonial-card .author {
  display: flex;
  align-items: center;
  gap: 12px;
}

.testimonial-card .author-avatar {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--wa-green-dim);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.85rem;
  color: var(--wa-green);
  flex-shrink: 0;
}

.testimonial-card .author-info .name {
  font-weight: 600;
  font-size: 0.9rem;
}

.testimonial-card .author-info .role {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* --- FAQ Accordion --- */
.faq-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--wa-border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: border-color var(--transition);
}

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

.faq-question {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 20px 24px;
  background: none;
  border: none;
  color: var(--text-primary);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  text-align: left;
  transition: color var(--transition);
}

.faq-question:hover {
  color: var(--wa-green);
}

.faq-question .faq-icon {
  width: 24px;
  height: 24px;
  flex-shrink: 0;
  transition: transform var(--transition);
  color: var(--wa-green);
}

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

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease, padding 0.3s ease;
  padding: 0 24px;
}

.faq-item.open .faq-answer {
  max-height: 400px;
  padding: 0 24px 20px;
}

.faq-answer p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.7;
  margin: 0;
}

.faq-answer ul {
  margin: 8px 0 0 20px;
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.7;
}

/* --- Contact Form --- */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: start;
}

.contact-form {
  background: var(--bg-card);
  border: 1px solid var(--wa-border);
  border-radius: var(--radius);
  padding: 36px;
}

.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 6px;
  color: var(--text-secondary);
}

.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 12px 16px;
  background: var(--wa-input);
  border: 1px solid var(--wa-border);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-size: 0.95rem;
  font-family: var(--font);
  transition: border-color var(--transition);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--wa-green);
  box-shadow: 0 0 0 3px var(--wa-green-glow);
}

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

.form-group .form-error {
  color: var(--wa-danger);
  font-size: 0.8rem;
  margin-top: 4px;
}

.contact-info-cards {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.contact-info-card {
  background: var(--bg-card);
  border: 1px solid var(--wa-border);
  border-radius: var(--radius);
  padding: 24px;
  display: flex;
  align-items: center;
  gap: 16px;
  transition: border-color var(--transition);
}

.contact-info-card:hover {
  border-color: var(--wa-green);
}

.contact-info-card .contact-icon {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--wa-green-dim);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.contact-info-card .contact-icon svg {
  width: 20px;
  height: 20px;
  stroke: var(--wa-green);
  fill: none;
  stroke-width: 2;
}

.contact-info-card h4 {
  font-size: 0.9rem;
  font-weight: 700;
  margin-bottom: 2px;
}

.contact-info-card p {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

/* --- About Page --- */
.about-mission {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
  margin-bottom: 60px;
}

.about-mission-content h2 {
  font-size: 1.6rem;
  font-weight: 700;
  margin-bottom: 16px;
}

.about-mission-content p {
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 12px;
}

.about-mission-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.stat-card {
  background: var(--bg-card);
  border: 1px solid var(--wa-border);
  border-radius: var(--radius);
  padding: 28px 20px;
  text-align: center;
}

.stat-card .stat-number {
  font-size: 2rem;
  font-weight: 900;
  color: var(--wa-green);
}

.stat-card .stat-label {
  font-size: 0.8rem;
  color: var(--text-secondary);
  margin-top: 4px;
}

.values-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

/* --- Changelog Timeline --- */
.timeline {
  position: relative;
  padding-left: 32px;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 11px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--wa-border);
}

.timeline-item {
  position: relative;
  margin-bottom: 36px;
}

.timeline-item::before {
  content: '';
  position: absolute;
  left: -32px;
  top: 6px;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--bg-body);
  border: 2px solid var(--wa-green);
}

.timeline-item .tl-date {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 4px;
  font-weight: 600;
}

.timeline-item .tl-version {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--wa-green);
}

.timeline-item .tl-tag {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  padding: 2px 10px;
  border-radius: 4px;
  margin-bottom: 8px;
}

.tl-tag.feature {
  background: var(--wa-green-dim);
  color: var(--wa-green);
}

.tl-tag.security {
  background: rgba(239, 83, 80, 0.15);
  color: var(--wa-danger);
}

.tl-tag.fix {
  background: rgba(255, 167, 38, 0.15);
  color: var(--wa-warning);
}

.timeline-item ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.timeline-item li {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-bottom: 4px;
  padding-left: 16px;
  position: relative;
}

.timeline-item li::before {
  content: '—';
  position: absolute;
  left: 0;
  color: var(--text-muted);
}

/* --- Responsive additions --- */
@media (max-width: 1024px) {
  .testimonial-grid,
  .values-grid {
    grid-template-columns: 1fr;
  }

  .contact-grid,
  .about-mission {
    grid-template-columns: 1fr;
  }

  .about-mission-stats {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (max-width: 768px) {
  .cta-banner {
    padding: 36px 24px;
  }

  .cta-banner h2 {
    font-size: 1.5rem;
  }

  .comparison-table {
    font-size: 0.8rem;
  }

  .comparison-table thead th,
  .comparison-table tbody td {
    padding: 10px 12px;
  }

  .contact-form {
    padding: 24px;
  }

  .about-mission-stats {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 1024px) {
  .hero .container {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .hero-content p {
    margin: 0 auto 32px;
  }

  .hero-content .hero-buttons {
    justify-content: center;
  }

  .hero-visual {
    display: none;
  }

  .grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }

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

@media (max-width: 768px) {
  section {
    padding: 60px 0;
  }

  .section-title {
    font-size: 1.7rem;
  }

  .hero-content h1 {
    font-size: 2.25rem;
  }

  .grid-3,
  .grid-4 {
    grid-template-columns: 1fr;
  }

  .nav-links {
    display: none;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--bg-body);
    border-bottom: 1px solid var(--wa-border);
    flex-direction: column;
    padding: 16px;
    gap: 4px;
  }

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

  .nav-links a {
    display: block;
    padding: 12px 16px;
  }

  .nav-toggle {
    display: flex;
  }

  .page-header h1 {
    font-size: 2rem;
  }

  .security-spotlight {
    padding: 28px 24px;
  }

  footer .container {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  footer .brand {
    order: -1;
  }
}