/* ============================================================
   OPEN LETTER — Design System & Styles
   ============================================================ */

/* -- CSS Variables / Design Tokens -- */
:root {
  /* Palette — Deep indigo/purple dark theme */
  --bg-primary: #0a0a1a;
  --bg-secondary: #10102a;
  --bg-card: rgba(20, 20, 50, 0.65);
  --bg-card-hover: rgba(30, 30, 70, 0.75);
  --bg-glass: rgba(255, 255, 255, 0.04);

  --text-primary: #e8e8f0;
  --text-secondary: #9a9ab8;
  --text-muted: #6a6a8a;

  --accent: #7c6cf0;
  --accent-hover: #9080ff;
  --accent-glow: rgba(124, 108, 240, 0.35);
  --accent-soft: rgba(124, 108, 240, 0.12);

  --danger: #f06c7a;
  --danger-hover: #ff8090;
  --danger-glow: rgba(240, 108, 122, 0.35);

  --success: #4ade80;
  --success-glow: rgba(74, 222, 128, 0.25);

  --border: rgba(255, 255, 255, 0.06);
  --border-focus: rgba(124, 108, 240, 0.5);

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;
  --radius-full: 9999px;

  --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.35), 0 0 0 1px var(--border);
  --shadow-glow: 0 0 40px var(--accent-glow);

  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-serif: 'Playfair Display', Georgia, serif;

  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-fast: 0.15s cubic-bezier(0.4, 0, 0.2, 1);
}

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

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

body {
  font-family: var(--font-sans);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
}

/* -- Background Particles -- */
.bg-particles {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  pointer-events: none;
  overflow: hidden;
}

.particle {
  position: absolute;
  border-radius: 50%;
  background: var(--accent);
  opacity: 0;
  animation: particle-float linear infinite;
}

@keyframes particle-float {
  0% {
    opacity: 0;
    transform: translateY(100vh) scale(0);
  }

  10% {
    opacity: 0.6;
  }

  90% {
    opacity: 0.6;
  }

  100% {
    opacity: 0;
    transform: translateY(-10vh) scale(1);
  }
}

/* -- Container -- */
.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
}

/* -- Navbar -- */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: 16px 0;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  background: rgba(10, 10, 26, 0.7);
  border-bottom: 1px solid var(--border);
  transition: var(--transition);
}

.navbar.scrolled {
  padding: 10px 0;
  background: rgba(10, 10, 26, 0.92);
}

.nav-container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--text-primary);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 8px;
  transition: var(--transition);
}

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

.logo-icon {
  color: var(--accent);
  font-size: 1.4rem;
  animation: logo-pulse 3s ease-in-out infinite;
}

@keyframes logo-pulse {

  0%,
  100% {
    opacity: 1;
    transform: scale(1);
  }

  50% {
    opacity: 0.7;
    transform: scale(1.15);
  }
}

.nav-links {
  display: flex;
  gap: 32px;
}

.nav-links a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
  transition: var(--transition);
  position: relative;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent);
  border-radius: 1px;
  transition: var(--transition);
}

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

.nav-links a:hover::after {
  width: 100%;
}

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

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 720px;
}

.hero-badge {
  display: inline-block;
  padding: 8px 20px;
  border-radius: var(--radius-full);
  background: var(--accent-soft);
  border: 1px solid rgba(124, 108, 240, 0.2);
  color: var(--accent-hover);
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin-bottom: 28px;
  animation: fadeInUp 0.8s ease-out;
}

.hero-title {
  font-family: var(--font-serif);
  font-size: clamp(3rem, 8vw, 5.5rem);
  font-weight: 700;
  line-height: 1.05;
  margin-bottom: 24px;
  animation: fadeInUp 0.8s ease-out 0.15s both;
  background: linear-gradient(135deg, var(--text-primary) 0%, var(--accent-hover) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.title-dot {
  -webkit-text-fill-color: var(--accent);
}

.hero-subtitle {
  font-size: 1.15rem;
  color: var(--text-secondary);
  line-height: 1.7;
  max-width: 560px;
  margin: 0 auto 40px;
  animation: fadeInUp 0.8s ease-out 0.3s both;
}

.hero-stats {
  display: flex;
  justify-content: center;
  gap: 48px;
  margin-bottom: 40px;
  animation: fadeInUp 0.8s ease-out 0.45s both;
}

.stat {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.stat-number {
  font-size: 2.8rem;
  font-weight: 800;
  color: var(--accent-hover);
  line-height: 1;
  font-variant-numeric: tabular-nums;
}

.stat-label {
  font-size: 0.85rem;
  color: var(--text-muted);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-top: 6px;
}

.hero-cta {
  display: inline-block;
  padding: 16px 40px;
  border-radius: var(--radius-full);
  background: linear-gradient(135deg, var(--accent), #5a4cd0);
  color: #fff;
  font-weight: 600;
  font-size: 1rem;
  text-decoration: none;
  transition: var(--transition);
  box-shadow: 0 4px 20px var(--accent-glow);
  animation: fadeInUp 0.8s ease-out 0.6s both;
}

.hero-cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 32px var(--accent-glow);
}

.hero-glow {
  position: absolute;
  top: 30%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, var(--accent-glow) 0%, transparent 70%);
  border-radius: 50%;
  z-index: 0;
  pointer-events: none;
  animation: glow-breathe 6s ease-in-out infinite;
}

@keyframes glow-breathe {

  0%,
  100% {
    opacity: 0.4;
    transform: translate(-50%, -50%) scale(1);
  }

  50% {
    opacity: 0.7;
    transform: translate(-50%, -50%) scale(1.1);
  }
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* -- Section -- */
.section {
  padding: 100px 0;
  position: relative;
  z-index: 1;
}

.section-header {
  text-align: center;
  margin-bottom: 56px;
}

.section-title {
  font-family: var(--font-serif);
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: 16px;
}

.section-divider {
  width: 60px;
  height: 3px;
  background: linear-gradient(90deg, var(--accent), var(--accent-hover));
  border-radius: 2px;
  margin: 0 auto 20px;
}

.section-desc {
  color: var(--text-secondary);
  font-size: 1.05rem;
  max-width: 520px;
  margin: 0 auto;
}

/* -- Letter Card -- */
.letter-section {
  background: var(--bg-secondary);
}

.letter-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 56px;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: var(--shadow-card);
  max-width: 760px;
  margin: 0 auto;
  position: relative;
  overflow: hidden;
}

.letter-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--accent), var(--accent-hover), var(--accent));
}

.letter-content {
  font-size: 1.08rem;
  line-height: 1.8;
  color: var(--text-secondary);
}

.letter-content p {
  margin-bottom: 20px;
}

.letter-content strong {
  color: var(--text-primary);
  font-weight: 700;
}

.letter-content h3 {
  color: var(--accent-hover);
  font-size: 1.15rem;
  font-weight: 700;
  margin-top: 32px;
  margin-bottom: 12px;
}

.letter-content ol {
  padding-left: 24px;
  margin-bottom: 12px;
}

.letter-content ol>li {
  margin-bottom: 8px;
  color: var(--text-primary);
  font-weight: 600;
}

.letter-content ul {
  list-style: disc;
  padding-left: 24px;
  margin-bottom: 16px;
}

.letter-content ul>li {
  margin-bottom: 10px;
  color: var(--text-secondary);
  font-weight: 400;
}

.letter-content ul>li strong {
  color: var(--accent-hover);
}

.letter-salutation {
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 24px !important;
  font-size: 1.15rem;
}

.letter-closing {
  margin-top: 32px !important;
  font-style: italic;
  color: var(--text-primary);
}

.letter-signed {
  font-weight: 700;
  color: var(--accent-hover);
  font-size: 1.1rem;
}

/* -- Forms -- */
.forms-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  max-width: 900px;
  margin: 0 auto;
}

.form-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 40px;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: var(--shadow-card);
  transition: var(--transition);
}

.form-card:hover {
  border-color: rgba(255, 255, 255, 0.1);
  background: var(--bg-card-hover);
}

.form-card-header {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 28px;
}

.form-card-header h3 {
  font-size: 1.25rem;
  font-weight: 600;
}

.form-icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.sign-icon {
  background: var(--accent-soft);
  color: var(--accent-hover);
}

.remove-icon {
  background: rgba(240, 108, 122, 0.12);
  color: var(--danger);
}

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

.form-group label {
  display: block;
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

.required {
  color: var(--danger);
}

.optional {
  color: var(--text-muted);
  font-weight: 400;
}

.form-group input {
  width: 100%;
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--bg-glass);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 0.95rem;
  transition: var(--transition);
  outline: none;
}

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

.form-group input:focus {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px var(--accent-soft);
}

.form-group input.error {
  border-color: var(--danger);
  box-shadow: 0 0 0 3px rgba(240, 108, 122, 0.12);
}

.field-error {
  font-size: 0.82rem;
  color: var(--danger);
  margin-top: 6px;
  min-height: 0;
  transition: var(--transition-fast);
}

/* Buttons */
.btn {
  width: 100%;
  padding: 14px 24px;
  border: none;
  border-radius: var(--radius-sm);
  font-family: var(--font-sans);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  position: relative;
  overflow: hidden;
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent), #5a4cd0);
  color: #fff;
  box-shadow: 0 4px 16px var(--accent-glow);
}

.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 24px var(--accent-glow);
}

.btn-danger {
  background: linear-gradient(135deg, var(--danger), #d04c5a);
  color: #fff;
  box-shadow: 0 4px 16px var(--danger-glow);
}

.btn-danger:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 24px var(--danger-glow);
}

.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
  border: 1px solid var(--border);
  margin-top: 12px;
}

.btn-ghost:hover {
  border-color: rgba(255, 255, 255, 0.15);
  color: var(--text-primary);
  background: var(--bg-glass);
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none !important;
}

.btn-loader {
  width: 18px;
  height: 18px;
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
}

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

/* Verification Step */
.verification-step {
  text-align: center;
  padding: 10px 0;
}

.verification-step h4 {
  font-size: 1.15rem;
  margin-bottom: 8px;
}

.verification-step p {
  color: var(--text-secondary);
  font-size: 0.92rem;
  margin-bottom: 20px;
}

.verification-icon {
  font-size: 2.5rem;
  margin-bottom: 12px;
}

.verification-hint {
  color: var(--text-muted);
  font-size: 0.82rem;
  font-style: italic;
  margin-top: 8px;
  margin-bottom: 16px;
}

.code-display {
  display: inline-block;
  padding: 12px 28px;
  background: var(--accent-soft);
  border: 1px dashed var(--accent);
  border-radius: var(--radius-sm);
  font-size: 1.6rem;
  font-weight: 700;
  letter-spacing: 0.3em;
  color: var(--accent-hover);
  margin-bottom: 20px;
  font-variant-numeric: tabular-nums;
}

/* Success Message */
.success-message {
  text-align: center;
  padding: 20px 0;
}

.success-icon {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  background: var(--success-glow);
  color: var(--success);
  font-size: 1.8rem;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 16px;
  animation: success-pop 0.5s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.remove-success-icon {
  background: var(--danger-glow);
  color: var(--danger);
}

@keyframes success-pop {
  0% {
    transform: scale(0);
  }

  100% {
    transform: scale(1);
  }
}

.success-message h4 {
  font-size: 1.3rem;
  margin-bottom: 8px;
}

.success-message p {
  color: var(--text-secondary);
  margin-bottom: 16px;
}

/* -- Signatories List -- */
.signatories-section {
  background: var(--bg-secondary);
}

.signatories-list {
  max-width: 800px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(230px, 1fr));
  gap: 16px;
}

.signatory-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 20px;
  transition: var(--transition);
  animation: fadeInUp 0.4s ease-out both;
}

.signatory-card:hover {
  border-color: rgba(255, 255, 255, 0.1);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.2);
}

.signatory-name {
  font-weight: 600;
  font-size: 1rem;
  margin-bottom: 4px;
}

.signatory-company {
  color: var(--accent-hover);
  font-size: 0.85rem;
  font-weight: 500;
}

.signatory-date {
  color: var(--text-muted);
  font-size: 0.78rem;
  margin-top: 8px;
}

.empty-state {
  grid-column: 1 / -1;
  text-align: center;
  padding: 60px 20px;
}

.empty-icon {
  font-size: 3rem;
  margin-bottom: 16px;
  opacity: 0.5;
}

.empty-state p {
  color: var(--text-muted);
  font-size: 1.05rem;
}

/* -- Toast -- */
.toast-container {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 1000;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.toast {
  padding: 14px 24px;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 500;
  color: #fff;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
  animation: toast-in 0.3s ease-out;
  max-width: 360px;
}

.toast.toast-success {
  background: linear-gradient(135deg, #059669, #047857);
}

.toast.toast-error {
  background: linear-gradient(135deg, #dc2626, #b91c1c);
}

.toast.toast-info {
  background: linear-gradient(135deg, var(--accent), #5a4cd0);
}

.toast.toast-out {
  animation: toast-out 0.3s ease-in forwards;
}

@keyframes toast-in {
  from {
    opacity: 0;
    transform: translateX(40px);
  }

  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes toast-out {
  from {
    opacity: 1;
    transform: translateX(0);
  }

  to {
    opacity: 0;
    transform: translateX(40px);
  }
}

/* -- Footer -- */
.footer {
  padding: 32px 0;
  text-align: center;
  border-top: 1px solid var(--border);
  position: relative;
  z-index: 1;
}

.footer p {
  color: var(--text-muted);
  font-size: 0.85rem;
}

/* -- Responsive -- */
@media (max-width: 768px) {
  .nav-links {
    display: none;
  }

  .hero {
    padding: 100px 20px 60px;
    min-height: auto;
  }

  .hero-title {
    font-size: clamp(2.2rem, 10vw, 3.5rem);
  }

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

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

  .letter-card {
    padding: 32px 24px;
  }

  .signatories-list {
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  }

  .section {
    padding: 64px 0;
  }

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

@media (max-width: 480px) {
  .form-card {
    padding: 24px;
  }

  .hero-stats {
    gap: 24px;
  }

  .stat-number {
    font-size: 2rem;
  }
}