/* ===================================================
   Portalz Connect — Landing Page v2 Styles
   Educational layout: problem → solution → protocol → trust → CTA
   Matches portalz.ai design. Dark default, teal accent.
   Light + Dark mode via data-theme attribute.
   =================================================== */

/* ================= CSS VARIABLES ================= */
:root {
  /* Accent */
  --accent: #359bc8;
  --accent-hover: #2d86ad;
  --accent-glow: rgba(53, 155, 200, 0.25);
  --accent-subtle: rgba(53, 155, 200, 0.08);

  /* Purple highlight (matches portalz.ai hero) */
  --purple: #8b5cf6;
  --purple-glow: rgba(139, 92, 246, 0.2);

  /* Dark theme (default) */
  --bg-primary: #0b0f14;
  --bg-secondary: #111820;
  --bg-card: #151c25;
  --bg-card-border: rgba(255, 255, 255, 0.06);
  --bg-header: rgba(11, 15, 20, 0.85);
  --bg-highlight: rgba(53, 155, 200, 0.04);

  --text-primary: #f0f2f5;
  --text-secondary: #8b95a5;
  --text-muted: #5a6577;

  --border: rgba(255, 255, 255, 0.08);
  --border-card: rgba(255, 255, 255, 0.06);

  --ring-color: rgba(53, 155, 200, 0.08);

  /* Focus ring */
  --focus-ring: rgba(139, 92, 246, 0.5);

  /* Ecosystem diagram */
  --eco-connect-bg: rgba(139, 92, 246, 0.12);
  --eco-connect-border: rgba(139, 92, 246, 0.3);
  --eco-cloud-bg: rgba(53, 155, 200, 0.12);
  --eco-cloud-border: rgba(53, 155, 200, 0.3);
  --eco-line-color: rgba(255, 255, 255, 0.12);
}

[data-theme="light"] {
  --bg-primary: #ffffff;
  --bg-secondary: #f7f8fa;
  --bg-card: #ffffff;
  --bg-card-border: rgba(0, 0, 0, 0.08);
  --bg-header: rgba(255, 255, 255, 0.9);
  --bg-highlight: rgba(53, 155, 200, 0.03);

  --text-primary: #111827;
  --text-secondary: #6b7280;
  --text-muted: #9ca3af;

  --border: rgba(0, 0, 0, 0.08);
  --border-card: rgba(0, 0, 0, 0.08);

  --ring-color: rgba(53, 155, 200, 0.06);

  --focus-ring: rgba(139, 92, 246, 0.4);

  --eco-connect-bg: rgba(139, 92, 246, 0.06);
  --eco-connect-border: rgba(139, 92, 246, 0.2);
  --eco-cloud-bg: rgba(53, 155, 200, 0.06);
  --eco-cloud-border: rgba(53, 155, 200, 0.2);
  --eco-line-color: rgba(0, 0, 0, 0.1);
}

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

html {
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Smooth scroll only for users without motion sensitivity */
@media (prefers-reduced-motion: no-preference) {
  html { scroll-behavior: smooth; }
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  transition: background 0.3s ease, color 0.3s ease;
}

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

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

/* Screen-reader only utility */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

/* ================= FOCUS VISIBLE ================= */
:focus-visible {
  outline: 2px solid var(--focus-ring);
  outline-offset: 2px;
}

.btn:focus-visible {
  outline: 2px solid var(--focus-ring);
  outline-offset: 3px;
}

.form-input:focus-visible {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

.theme-toggle:focus-visible {
  outline: 2px solid var(--focus-ring);
  outline-offset: 2px;
}

/* ================= CONTAINER ================= */
.container {
  max-width: 1140px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ================= HEADER ================= */
.header {
  position: fixed;
  top: 16px;
  left: 50%;
  transform: translateX(-50%);
  width: calc(100% - 48px);
  max-width: 1140px;
  z-index: 1000;
  background: var(--bg-header);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 0 24px;
  transition: background 0.3s ease, border-color 0.3s ease;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
  padding: 0;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: 0.08em;
  color: var(--text-primary);
}

.logo-text {
  white-space: nowrap;
}

.logo-portalz {
  color: var(--text-muted);
  font-weight: 600;
  letter-spacing: 0.06em;
}

.logo-icon {
  color: var(--accent);
}

.nav {
  display: flex;
  align-items: center;
  gap: 28px;
}

.nav-link {
  font-size: 0.88rem;
  color: var(--text-secondary);
  transition: color 0.2s ease;
  font-weight: 500;
}

.nav-link:hover {
  color: var(--text-primary);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

/* Theme toggle */
.theme-toggle {
  background: none;
  border: 1px solid var(--border);
  border-radius: 10px;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: var(--text-secondary);
  transition: color 0.2s ease, border-color 0.2s ease;
}

.theme-toggle:hover {
  color: var(--text-primary);
  border-color: var(--text-muted);
}

/* Dark mode: show sun, hide moon */
.icon-moon { display: none; }
.icon-sun { display: block; }

[data-theme="light"] .icon-moon { display: block; }
[data-theme="light"] .icon-sun { display: none; }

/* Hamburger */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: transform 0.3s ease, opacity 0.3s ease;
}

.hamburger.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger.active span:nth-child(2) { opacity: 0; }
.hamburger.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ================= BUTTONS ================= */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-weight: 600;
  font-size: 0.95rem;
  border: none;
  border-radius: 50px;
  cursor: pointer;
  transition: all 0.25s ease;
  text-decoration: none;
}

.btn:disabled {
  opacity: 0.55;
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}

.btn-primary {
  background: var(--purple);
  color: #fff;
  box-shadow: 0 4px 24px var(--purple-glow);
}

.btn-primary:hover:not(:disabled) {
  background: #7c4fe0;
  box-shadow: 0 6px 32px rgba(139, 92, 246, 0.35);
  transform: translateY(-1px);
}

.btn-accent {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 4px 24px var(--accent-glow);
}

.btn-accent:hover:not(:disabled) {
  background: var(--accent-hover);
  box-shadow: 0 6px 32px rgba(53, 155, 200, 0.35);
  transform: translateY(-1px);
}

.btn-outline {
  background: transparent;
  color: var(--text-primary);
  border: 1px solid var(--border);
  transition: border-color 0.25s ease, transform 0.25s ease, background 0.3s ease, color 0.3s ease;
}

.btn-outline:hover:not(:disabled) {
  border-color: var(--text-muted);
  transform: translateY(-1px);
}

.btn-lg {
  padding: 16px 40px;
  font-size: 1rem;
}

/* ================= HERO ================= */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  overflow: hidden;
  padding: 120px 24px 80px;
}

.hero-bg-shapes {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 100%;
  height: 100%;
  pointer-events: none;
}

.hero-ring {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  border-radius: 50%;
  border: 1px solid var(--ring-color);
}

.hero-ring-1 { width: 400px; height: 400px; }
.hero-ring-2 { width: 650px; height: 650px; }
.hero-ring-3 { width: 900px; height: 900px; }

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 760px;
}

.hero-badge {
  display: inline-block;
  padding: 8px 20px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-secondary);
  border: 1px solid var(--border);
  border-radius: 50px;
  margin-bottom: 28px;
  letter-spacing: 0.02em;
}

.hero-title {
  font-size: clamp(2.2rem, 5vw, 3.8rem);
  font-weight: 800;
  line-height: 1.1;
  margin-bottom: 24px;
  letter-spacing: -0.02em;
}

.accent {
  color: var(--purple);
}

.hero-subtitle {
  font-size: 1.15rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto 40px;
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
}

/* ================= SECTION COMMON ================= */
.section-badge {
  display: inline-block;
  padding: 6px 16px;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--accent);
  background: var(--accent-glow);
  border-radius: 50px;
  margin-bottom: 16px;
  letter-spacing: 0.03em;
}

.section-title {
  font-size: clamp(1.8rem, 3.5vw, 2.6rem);
  font-weight: 700;
  margin-bottom: 20px;
  letter-spacing: -0.02em;
}

.section-intro {
  font-size: 1.1rem;
  color: var(--text-secondary);
  line-height: 1.7;
  max-width: 700px;
  margin: 0 auto 56px;
}

/* ================= SCROLL REVEAL ================= */
/* CSS-class based reveal — no inline styles, so hover transforms still work */

.problem-card,
.ring-feature,
.protocol-step,
.trust-card,
.use-case-card,
.ring-demo,
.problem-analogy,
.cloud-promo-box,
.signup-box {
  transition: opacity 0.5s ease, transform 0.5s ease, border-color 0.25s ease, background 0.3s ease;
}

.reveal-hidden {
  opacity: 0;
  transform: translateY(24px);
}

@media (prefers-reduced-motion: reduce) {
  .reveal-hidden {
    transform: none; /* Just fade, no movement */
  }
}

/* ================= THE PROBLEM ================= */
.problem {
  padding: 120px 0;
  text-align: center;
}

.problem-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  text-align: left;
  margin-bottom: 48px;
}

.problem-card {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: 16px;
  padding: 32px 28px;
}

.problem-card:hover {
  border-color: rgba(255, 107, 107, 0.4);
}

[data-theme="light"] .problem-card:hover {
  border-color: rgba(220, 60, 60, 0.35);
}

.problem-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: rgba(255, 107, 107, 0.1);
  color: #ff6b6b;
  margin-bottom: 18px;
}

[data-theme="light"] .problem-icon {
  background: rgba(220, 60, 60, 0.08);
  color: #dc3c3c;
}

.problem-card h3 {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 10px;
}

.problem-card p {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.65;
}

.problem-analogy {
  max-width: 720px;
  margin: 0 auto;
  padding: 32px 40px;
  background: var(--bg-highlight);
  border: 1px solid var(--border);
  border-radius: 16px;
  text-align: left;
}

.analogy-text {
  font-size: 1.05rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

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

/* ================= RING NUMBERS ================= */
.ring-numbers {
  padding: 120px 0;
  background: var(--bg-secondary);
  text-align: center;
  transition: background 0.3s ease;
}

/* Ring number demo */
.ring-demo {
  max-width: 560px;
  margin: 0 auto 64px;
  padding: 36px 40px;
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: 20px;
}

.ring-demo-label {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 12px;
}

.ring-demo-number {
  font-size: clamp(1.4rem, 3vw, 1.9rem);
  font-weight: 700;
  font-family: 'SF Mono', 'Fira Code', 'Consolas', monospace;
  color: var(--accent);
  margin-bottom: 20px;
  letter-spacing: 0.02em;
}

.ring-demo-parts {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px 16px;
}

.ring-part {
  font-size: 0.78rem;
  color: var(--text-muted);
}

.ring-part code {
  font-family: 'SF Mono', 'Fira Code', 'Consolas', monospace;
  color: var(--text-secondary);
  background: var(--accent-subtle);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 0.76rem;
  margin-right: 4px;
}

/* Ring features grid */
.ring-features-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  text-align: left;
}

.ring-feature {
  padding: 32px 28px;
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: 16px;
}

.ring-feature:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
}

.ring-feature-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: var(--accent-glow);
  color: var(--accent);
  margin-bottom: 18px;
}

.ring-feature h3 {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 10px;
}

.ring-feature p {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.65;
}

/* ================= HOW IT WORKS — RING PROTOCOL ================= */
.how-it-works {
  padding: 120px 0;
  text-align: center;
}

.protocol-steps {
  max-width: 640px;
  margin: 0 auto;
  text-align: left;
}

.protocol-step {
  display: flex;
  gap: 24px;
  align-items: flex-start;
}

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

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

.step-content p {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.65;
}

.protocol-connector {
  width: 2px;
  height: 36px;
  background: var(--border);
  margin-left: 23px;
}

/* ================= TRUST & VERIFICATION ================= */
.trust {
  padding: 120px 0;
  background: var(--bg-secondary);
  text-align: center;
  transition: background 0.3s ease;
}

.trust-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  text-align: left;
}

.trust-card {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: 16px;
  padding: 36px 32px;
}

.trust-card:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
}

.trust-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 56px;
  height: 56px;
  border-radius: 14px;
  background: var(--accent-glow);
  color: var(--accent);
  margin-bottom: 20px;
}

.trust-card h3 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 10px;
}

.trust-card p {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.65;
}

/* ================= USE CASES ================= */
.use-cases {
  padding: 120px 0;
  text-align: center;
}

.use-case-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  text-align: left;
}

.use-case-card {
  padding: 32px 28px;
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: 16px;
}

.use-case-card:hover {
  border-color: var(--purple);
  transform: translateY(-2px);
}

.use-case-card h3 {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--purple);
}

.use-case-card p {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.65;
}

/* ================= CLOUD CROSS-PROMO ================= */
.cloud-promo {
  padding: 120px 0;
  background: var(--bg-secondary);
  transition: background 0.3s ease;
}

.cloud-promo-box {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 48px;
  align-items: center;
}

.cloud-promo-content {
  text-align: left;
}

.cloud-promo-title {
  font-size: clamp(1.8rem, 3.5vw, 2.4rem);
  font-weight: 700;
  margin-bottom: 20px;
  letter-spacing: -0.02em;
}

.cloud-promo-text {
  font-size: 1.05rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 16px;
}

.cloud-promo-text strong {
  color: var(--text-primary);
}

.cloud-promo-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-top: 32px;
}

/* Ecosystem diagram */
.cloud-promo-visual {
  display: flex;
  align-items: center;
  justify-content: center;
}

.ecosystem-diagram {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0;
  width: 100%;
  max-width: 280px;
}

.eco-node {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  width: 100%;
  padding: 28px 20px;
  border-radius: 16px;
  border: 1px solid;
  text-align: center;
  transition: background 0.3s ease, border-color 0.3s ease;
}

.eco-connect {
  background: var(--eco-connect-bg);
  border-color: var(--eco-connect-border);
}

.eco-cloud {
  background: var(--eco-cloud-bg);
  border-color: var(--eco-cloud-border);
}

.eco-label {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 4px;
}

.eco-connect .eco-label { color: var(--purple); }
.eco-cloud .eco-label { color: var(--accent); }

.eco-desc {
  font-size: 0.82rem;
  color: var(--text-muted);
}

.eco-line {
  width: 2px;
  height: 32px;
  background: var(--eco-line-color);
  transition: background 0.3s ease;
}

/* ================= SIGNUP CTA ================= */
.signup-section {
  padding: 120px 0;
  text-align: center;
}

.signup-box {
  max-width: 600px;
  margin: 0 auto;
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: 20px;
  padding: 56px 48px;
}

.signup-title {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.signup-subtitle {
  font-size: 1rem;
  color: var(--text-secondary);
  margin-bottom: 32px;
  line-height: 1.6;
}

.signup-form {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

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

.form-input {
  flex: 1;
  padding: 14px 18px;
  font-size: 0.95rem;
  font-family: inherit;
  background: var(--bg-secondary);
  color: var(--text-primary);
  border: 1px solid var(--border);
  border-radius: 12px;
  outline: none;
  transition: border-color 0.2s ease, background 0.3s ease, color 0.3s ease, box-shadow 0.2s ease;
}

.form-input::placeholder {
  color: var(--text-muted);
}

.btn-submit {
  width: 100%;
}

.btn-loader {
  display: none;
  animation: pzSpinLoader 1s linear infinite;
}

@keyframes pzSpinLoader {
  to { transform: rotate(360deg); }
}

.form-message {
  font-size: 0.85rem;
  min-height: 1.2em;
  margin-top: 4px;
}

.form-message.success {
  color: #4ecdc4;
}

.form-message.error {
  color: #ff6b6b;
}

/* ================= FOOTER ================= */
.footer {
  padding: 48px 0;
  border-top: 1px solid var(--border);
  transition: border-color 0.3s ease;
}

.footer-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 20px;
  text-align: center;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--text-secondary);
}

.footer-brand .logo-icon {
  color: var(--accent);
}

.footer-links {
  display: flex;
  gap: 24px;
  font-size: 0.85rem;
}

.footer-link {
  color: var(--text-secondary);
  transition: color 0.2s ease;
}

.footer-link:hover {
  color: var(--text-primary);
}

.footer-link-active {
  color: var(--accent);
  cursor: default;
}

.footer-copy {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* ================= RESPONSIVE ================= */
@media (max-width: 900px) {
  .cloud-promo-box {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .cloud-promo-content {
    text-align: center;
  }

  .cloud-promo-actions {
    justify-content: center;
  }
}

@media (max-width: 768px) {
  .header {
    top: 8px;
    width: calc(100% - 24px);
    padding: 0 16px;
  }

  .nav {
    display: none;
    position: absolute;
    top: calc(100% + 8px);
    left: 0;
    right: 0;
    flex-direction: column;
    background: var(--bg-header);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 16px 24px;
    gap: 16px;
  }

  .nav.open {
    display: flex;
    max-height: calc(100vh - 80px);
    overflow-y: auto;
  }

  .hamburger {
    display: flex;
  }

  .hero {
    padding: 100px 16px 60px;
    min-height: auto;
  }

  .hero-title {
    font-size: 2rem;
  }

  .hero-subtitle {
    font-size: 1rem;
  }

  .hero-actions {
    flex-direction: column;
  }

  .hero-actions .btn {
    width: 100%;
  }

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

  .ring-features-grid {
    grid-template-columns: 1fr;
  }

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

  .use-case-grid {
    grid-template-columns: 1fr;
  }

  .protocol-step {
    gap: 16px;
  }

  .form-row {
    flex-direction: column;
  }

  .signup-box {
    padding: 36px 24px;
  }

  .problem-analogy {
    padding: 24px;
  }

  .ring-demo {
    padding: 28px 20px;
  }

  .ring-demo-number {
    font-size: 1.2rem;
  }

  .ring-demo-parts {
    flex-direction: column;
    align-items: center;
    gap: 6px;
  }

  .hero-ring-1 { width: 250px; height: 250px; }
  .hero-ring-2 { width: 400px; height: 400px; }
  .hero-ring-3 { width: 550px; height: 550px; }

  .section-intro {
    font-size: 1rem;
  }

  .cloud-promo-box {
    gap: 32px;
  }
}

@media (max-width: 480px) {
  .btn-lg {
    padding: 14px 28px;
    font-size: 0.9rem;
  }

  .section-title {
    font-size: 1.6rem;
  }

  .trust-card,
  .ring-feature,
  .use-case-card,
  .problem-card {
    padding: 24px 20px;
  }
}