/* pda-mail landing — PDAT design system */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800;900&display=swap');

:root {
  --bg: hsl(220, 20%, 6%);
  --bg-card: hsl(220, 18%, 10%);
  --text: hsl(0, 0%, 95%);
  --text-dim: hsl(220, 10%, 55%);
  --primary: hsl(330, 90%, 60%);
  --accent: hsl(25, 95%, 55%);
  --border: hsl(220, 15%, 20%);
  --border-half: hsla(220, 15%, 20%, 0.5);
  --gradient: linear-gradient(135deg, hsl(330, 90%, 60%) 0%, hsl(25, 95%, 55%) 100%);
  --gradient-hover: linear-gradient(135deg, hsl(330, 90%, 65%) 0%, hsl(25, 95%, 60%) 100%);
  --gradient-text: linear-gradient(135deg, hsl(330, 90%, 65%) 0%, hsl(25, 95%, 60%) 50%, hsl(330, 90%, 65%) 100%);
  --glass-bg: hsla(220, 18%, 10%, 0.6);
  --glass-border: hsla(220, 15%, 25%, 0.5);
  --shadow-glow: 0 0 30px hsla(330, 90%, 60%, 0.15);
  --radius: 0.75rem;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: 'Inter', system-ui, sans-serif;
  background-color: var(--bg);
  color: var(--text);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

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

/* --- Utilities --- */
.gradient-text {
  background-image: var(--gradient-text);
  background-size: 200% 200%;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: gradient-shift 8s ease infinite;
}

.grid-pattern {
  background-image:
    linear-gradient(hsla(220, 15%, 17%, 0.5) 1px, transparent 1px),
    linear-gradient(90deg, hsla(220, 15%, 17%, 0.5) 1px, transparent 1px);
  background-size: 60px 60px;
}

.glass {
  background: var(--glass-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--glass-border);
}

/* --- Animations --- */
@keyframes gradient-shift {
  0%, 100% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
}

@keyframes pulse-slow {
  0%, 100% { opacity: 0.4; }
  50% { opacity: 0.8; }
}

@keyframes slide-up {
  0% { opacity: 0; transform: translateY(30px); }
  100% { opacity: 1; transform: translateY(0); }
}

@keyframes fade-in {
  0% { opacity: 0; }
  100% { opacity: 1; }
}

@keyframes bounce-slow {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50% { transform: translateX(-50%) translateY(6px); }
}

.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* --- Header --- */
header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: 1rem 3rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: var(--glass-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--glass-border);
  transition: all 0.3s;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  text-decoration: none;
}

.logo span {
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--text);
}

.logo .dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--gradient);
  animation: pulse-slow 2s ease-in-out infinite;
}

header nav {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

header nav a {
  color: var(--text-dim);
  text-decoration: none;
  font-size: 0.875rem;
  font-weight: 500;
  transition: color 0.2s;
}

header nav a:hover { color: var(--text); }

.nav-cta {
  padding: 0.625rem 1.25rem;
  background: var(--gradient);
  color: white !important;
  border-radius: 8px;
  font-weight: 500;
  font-size: 0.875rem;
  transition: all 0.2s;
}

.nav-cta:hover { box-shadow: var(--shadow-glow); }

/* --- Hero --- */
.hero {
  min-height: 100vh;
  padding: 8rem 3rem 4rem;
  text-align: center;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.hero-bg-grid {
  position: absolute;
  inset: 0;
  opacity: 0.3;
}

.hero-bg-glow {
  position: absolute;
  top: 25%;
  left: 50%;
  transform: translateX(-50%);
  width: 800px;
  height: 800px;
  border-radius: 50%;
  background: radial-gradient(circle, hsla(330, 90%, 60%, 0.15) 0%, hsla(25, 95%, 55%, 0.1) 40%, transparent 70%);
  pointer-events: none;
  animation: pulse-slow 4s ease-in-out infinite;
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 900px;
  margin: 0 auto;
}

.hero-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 1.25rem;
  background: var(--glass-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--glass-border);
  border-radius: 9999px;
  font-size: 0.8rem;
  color: var(--text-dim);
  margin-bottom: 2.5rem;
  animation: fade-in 0.8s ease-out;
}

.hero-pill .dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--gradient);
  animation: pulse-slow 2s ease-in-out infinite;
}

.hero h1 {
  font-size: 5rem;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -2px;
  margin-bottom: 1.5rem;
  animation: slide-up 0.6s ease-out;
}

.hero .hero-text {
  font-size: 1.25rem;
  color: var(--text-dim);
  line-height: 1.5;
  max-width: 560px;
  margin: 0 auto 3rem;
  animation: fade-in 0.8s ease-out 0.2s both;
}

.hero-btns {
  display: flex;
  gap: 1rem;
  justify-content: center;
  animation: fade-in 0.8s ease-out 0.4s both;
}

.btn-grad {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.85rem 2rem;
  background: var(--gradient);
  color: white;
  font-family: inherit;
  font-size: 0.9rem;
  font-weight: 700;
  border: none;
  border-radius: 10px;
  cursor: pointer;
  text-decoration: none;
  transition: transform 0.2s, box-shadow 0.2s;
}

.btn-grad:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px hsla(330, 90%, 60%, 0.3);
}

.btn-outline {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.85rem 2rem;
  background: hsla(220, 15%, 15%, 0.5);
  color: var(--text);
  font-family: inherit;
  font-size: 0.9rem;
  font-weight: 600;
  border: 1px solid var(--border);
  border-radius: 10px;
  cursor: pointer;
  text-decoration: none;
  transition: all 0.2s;
}

.btn-outline:hover {
  border-color: var(--text-dim);
  background: hsla(220, 15%, 15%, 0.8);
}

.hero-scroll {
  position: absolute;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  color: var(--text-dim);
  text-decoration: none;
  animation: bounce-slow 2s ease-in-out infinite;
  opacity: 0.5;
  transition: opacity 0.2s;
}

.hero-scroll:hover { opacity: 1; }

/* --- Stats --- */
.stats {
  padding: 4rem 3rem;
}

.stats-card {
  max-width: 1100px;
  margin: 0 auto;
  background: var(--glass-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--glass-border);
  border-radius: 16px;
  padding: 3.5rem 2rem;
}

.stats-inner {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 2rem;
  text-align: center;
}

.stat-value {
  font-size: 3rem;
  font-weight: 700;
  letter-spacing: -1px;
  margin-bottom: 0.35rem;
  background-image: var(--gradient-text);
  background-size: 200% 200%;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: gradient-shift 8s ease infinite;
}

.stat-label {
  font-size: 0.7rem;
  color: var(--text-dim);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1.5px;
}

/* --- Features --- */
.features-section {
  padding: 5rem 3rem;
}

.features-inner {
  max-width: 1100px;
  margin: 0 auto;
}

.features-header {
  text-align: center;
  margin-bottom: 3.5rem;
}

.features-header h2 {
  font-size: 3rem;
  font-weight: 700;
  letter-spacing: -1px;
  margin-bottom: 0.75rem;
}

.features-header p {
  color: var(--text-dim);
  font-size: 1.05rem;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
}

.feature-card {
  background: var(--glass-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--glass-border);
  border-radius: 16px;
  padding: 2rem;
  transition: all 0.3s;
}

.feature-card:hover {
  border-color: var(--border);
  transform: translateY(-2px);
  box-shadow: var(--shadow-glow);
}

.feature-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  background: linear-gradient(135deg, hsla(330, 90%, 60%, 0.2), hsla(25, 95%, 55%, 0.2));
  color: var(--primary);
  margin-bottom: 1rem;
}

.feature-card h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.feature-card p {
  font-size: 0.85rem;
  color: var(--text-dim);
  line-height: 1.6;
}

/* --- Architecture --- */
.arch-section {
  padding: 5rem 3rem;
}

.arch-inner {
  max-width: 1100px;
  margin: 0 auto;
}

.arch-header {
  text-align: center;
  margin-bottom: 3.5rem;
}

.arch-header h2 {
  font-size: 3rem;
  font-weight: 700;
  letter-spacing: -1px;
  margin-bottom: 0.75rem;
}

.arch-header p {
  color: var(--text-dim);
  font-size: 1.05rem;
}

.arch-diagram {
  background: var(--glass-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--glass-border);
  border-radius: 16px;
  padding: 2.5rem;
  font-family: 'JetBrains Mono', 'Fira Code', monospace;
  font-size: 0.75rem;
  line-height: 1.6;
  white-space: pre;
  overflow-x: auto;
  color: var(--text-dim);
}

.arch-diagram .hl { color: var(--primary); }
.arch-diagram .cyan { color: var(--accent); }

.protocols {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 2rem;
  justify-content: center;
}

.proto-badge {
  padding: 0.4rem 1rem;
  border: 1px solid var(--glass-border);
  border-radius: 8px;
  font-size: 0.75rem;
  color: var(--text-dim);
  font-weight: 500;
}

.proto-badge.active {
  background: linear-gradient(135deg, hsla(330, 90%, 60%, 0.1), hsla(25, 95%, 55%, 0.1));
  border-color: hsla(330, 90%, 60%, 0.3);
  color: var(--primary);
}

/* --- Identity --- */
.identity-section {
  padding: 5rem 3rem;
}

.identity-card {
  max-width: 900px;
  margin: 0 auto;
  padding: 3rem;
  background: var(--glass-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--glass-border);
  border-radius: 16px;
  text-align: center;
}

.identity-card h2 {
  font-size: 3rem;
  font-weight: 700;
  letter-spacing: -1px;
  margin-bottom: 0.75rem;
}

.identity-card .sub {
  color: var(--text-dim);
  font-size: 1.05rem;
  margin-bottom: 2rem;
}

.identity-card .body {
  font-size: 1rem;
  color: var(--text-dim);
  line-height: 1.8;
  max-width: 700px;
  margin: 0 auto;
}

.identity-card em {
  font-style: normal;
  color: var(--text);
  font-weight: 600;
}

.identity-card a {
  color: var(--primary);
  border-bottom: 1px solid hsla(330, 90%, 60%, 0.3);
  transition: border-color 0.2s;
}

.identity-card a:hover {
  border-color: var(--primary);
}

/* --- CTA --- */
.cta-section {
  padding: 6rem 3rem;
  text-align: center;
  position: relative;
}

.cta-grid {
  position: absolute;
  inset: 0;
  opacity: 0.2;
}

.cta-glow {
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 1000px;
  height: 400px;
  border-radius: 50%;
  background: linear-gradient(to top, hsla(330, 90%, 60%, 0.2), transparent);
  filter: blur(100px);
  pointer-events: none;
}

.cta-card {
  max-width: 900px;
  margin: 0 auto;
  padding: 4rem 3rem;
  background: var(--glass-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--glass-border);
  border-radius: 24px;
  position: relative;
  z-index: 1;
  box-shadow: var(--shadow-glow);
}

.cta-card h2 {
  font-size: 3rem;
  font-weight: 700;
  letter-spacing: -1px;
  margin-bottom: 1rem;
}

.cta-card p {
  color: var(--text-dim);
  font-size: 1.05rem;
  margin-bottom: 2rem;
}

/* --- Footer --- */
footer {
  border-top: 1px solid var(--border);
  font-size: 0.85rem;
  color: var(--text-dim);
}

.footer-main {
  max-width: 1100px;
  margin: 0 auto;
  padding: 3rem 3rem 2rem;
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 3rem;
}

.footer-brand .logo { margin-bottom: 0.75rem; }

.footer-col h4 {
  color: var(--text);
  font-size: 0.85rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
}

.footer-col ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.footer-col li {
  font-size: 0.8rem;
  line-height: 1.5;
  color: var(--text-dim);
}

.footer-bottom {
  max-width: 1100px;
  margin: 0 auto;
  padding: 1.5rem 3rem;
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.8rem;
}

.footer-bottom a {
  color: var(--text-dim);
  transition: color 0.2s;
}

.footer-bottom a:hover { color: var(--text); }

/* --- Responsive --- */
@media (max-width: 900px) {
  header { padding: 1rem 2rem; }
  .hero { padding: 6rem 2rem 3rem; min-height: auto; }
  .hero h1 { font-size: 3.5rem; letter-spacing: -1.5px; }
  .hero-bg-glow { width: 500px; height: 500px; }
  .features-grid { grid-template-columns: 1fr; }
  .stats-inner { grid-template-columns: repeat(2, 1fr); }
  .footer-main { grid-template-columns: 1fr; gap: 2rem; }
}

@media (max-width: 600px) {
  header { padding: 1rem 1.5rem; }
  .hero h1 { font-size: 2.5rem; }
  header nav a:not(.nav-cta) { display: none; }
  .hero-btns { flex-direction: column; align-items: center; }
  .stats-inner { grid-template-columns: repeat(2, 1fr); }
  .stat-value { font-size: 2rem; }
  .footer-bottom { flex-direction: column; gap: 0.75rem; text-align: center; }
}