/* ==========================================================================
   MemChat Tester Hub — Design System & Styles
   Aesthetic: WhatsApp Dark Mode Obsidian & Emerald Glassmorphism
   ========================================================================== */

:root {
  --bg-canvas: #0B141A;
  --bg-surface: #111B21;
  --bg-surface-elevated: #182229;
  --bg-card: #202C33;
  --bg-input: #2A3942;
  
  --primary-teal: #00A884;
  --primary-emerald: #10B981;
  --whatsapp-green: #25D366;
  --whatsapp-blue: #53BDEB;
  
  --border-subtle: #222D34;
  --border-focus: #00A884;
  
  --text-primary: #E9EDEF;
  --text-secondary: #8696A0;
  --text-muted: #667781;
  
  --font-heading: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-xl: 32px;
  
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.25);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.35);
  --shadow-lg: 0 16px 40px rgba(0, 0, 0, 0.45);
  --shadow-glow: 0 0 35px rgba(0, 168, 132, 0.25);
}

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

html {
  scroll-behavior: smooth;
}

body {
  background-color: var(--bg-canvas);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  overflow-x: hidden;
  position: relative;
  /* WhatsApp Dark Subtle Doodle Pattern via SVG */
  background-image: 
    radial-gradient(circle at 50% 0%, rgba(0, 168, 132, 0.08) 0%, transparent 60%),
    url("data:image/svg+xml,%3Csvg width='80' height='80' viewBox='0 0 80 80' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='%23ffffff' fill-opacity='0.02' stroke='%23ffffff' stroke-opacity='0.025' stroke-width='1.2'%3E%3Cpath d='M15 15h12v9h-6l-3 4v-4h-3z'/%3E%3Ccircle cx='60' cy='20' r='5'/%3E%3Cpath d='M50 55l10-8-4 12-6-4z'/%3E%3Cpath d='M20 60h8v8h-8z'/%3E%3C/g%3E%3C/svg%3E");
}

/* Ambient glow accents */
.ambient-glow {
  position: fixed;
  border-radius: 50%;
  filter: blur(140px);
  pointer-events: none;
  z-index: 0;
}
.glow-top {
  top: -100px;
  right: -100px;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(0, 168, 132, 0.15), transparent 70%);
}
.glow-bottom {
  bottom: 100px;
  left: -150px;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(37, 211, 102, 0.08), transparent 70%);
}

.container {
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 24px;
  position: relative;
  z-index: 1;
}

/* Typography */
h1, h2, h3, h4 {
  font-family: var(--font-heading);
  color: var(--text-primary);
  font-weight: 700;
  line-height: 1.25;
}

.gradient-text {
  background: linear-gradient(135deg, #00A884 0%, #25D366 50%, #53BDEB 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* Navbar */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(11, 20, 26, 0.85);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-subtle);
  padding: 16px 0;
}
.nav-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
}
.brand-logo {
  width: 38px;
  height: 38px;
  background: rgba(0, 168, 132, 0.15);
  border: 1px solid rgba(0, 168, 132, 0.35);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.brand-name {
  font-family: var(--font-heading);
  font-size: 20px;
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: -0.3px;
}
.badge-beta {
  background: rgba(0, 168, 132, 0.2);
  border: 1px solid rgba(0, 168, 132, 0.4);
  color: var(--whatsapp-green);
  font-size: 11px;
  font-weight: 700;
  padding: 2px 7px;
  border-radius: 6px;
  text-transform: uppercase;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 20px;
}
.nav-links a:not(.btn) {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
  transition: color 0.2s;
}
.nav-links a:not(.btn):hover {
  color: var(--text-primary);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-family: var(--font-heading);
  font-weight: 700;
  border-radius: 28px;
  text-decoration: none;
  cursor: pointer;
  transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
  border: none;
}
.btn-primary {
  background: var(--primary-teal);
  color: #FFFFFF;
  box-shadow: 0 4px 16px rgba(0, 168, 132, 0.3);
}
.btn-primary:hover {
  background: #00BF96;
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(0, 168, 132, 0.45);
}
.btn-outline {
  background: transparent;
  color: var(--text-secondary);
  border: 1px solid var(--border-subtle);
}
.btn-outline:hover {
  color: var(--text-primary);
  border-color: var(--primary-teal);
}
.btn-ghost {
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-primary);
  border: 1px solid var(--border-subtle);
}
.btn-ghost:hover {
  background: rgba(255, 255, 255, 0.1);
  transform: translateY(-2px);
}
.btn-sm {
  padding: 8px 16px;
  font-size: 13px;
}
.btn-lg {
  padding: 14px 28px;
  font-size: 16px;
}
.btn-block {
  width: 100%;
}
.btn-download {
  background: linear-gradient(135deg, #00A884 0%, #05856B 100%);
  color: #FFFFFF;
  padding: 16px 32px;
  font-size: 17px;
  border-radius: 30px;
  box-shadow: 0 8px 24px rgba(0, 168, 132, 0.4);
}
.btn-download:hover {
  transform: translateY(-2px) scale(1.02);
  box-shadow: 0 12px 30px rgba(0, 168, 132, 0.55);
}
.btn-danger {
  background: rgba(239, 68, 68, 0.15);
  color: #EF4444;
  border: 1px solid rgba(239, 68, 68, 0.3);
}
.btn-danger:hover {
  background: rgba(239, 68, 68, 0.25);
}

/* Hero Section */
.hero-section {
  padding: 80px 0 60px;
}
.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  align-items: center;
  gap: 60px;
}
.hero-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  background: rgba(0, 168, 132, 0.12);
  border: 1px solid rgba(0, 168, 132, 0.3);
  border-radius: 20px;
  font-size: 13px;
  font-weight: 600;
  color: var(--whatsapp-green);
  margin-bottom: 24px;
}
.pill-dot {
  width: 8px;
  height: 8px;
  background: var(--whatsapp-green);
  border-radius: 50%;
  box-shadow: 0 0 8px var(--whatsapp-green);
  animation: pulse 2s infinite;
}
@keyframes pulse {
  0% { transform: scale(0.95); opacity: 0.8; }
  50% { transform: scale(1.2); opacity: 1; }
  100% { transform: scale(0.95); opacity: 0.8; }
}

.hero-title {
  font-size: 50px;
  letter-spacing: -1.2px;
  margin-bottom: 20px;
}
.hero-subtitle {
  font-size: 18px;
  color: var(--text-secondary);
  margin-bottom: 36px;
  max-width: 540px;
}
.hero-actions {
  display: flex;
  gap: 16px;
  margin-bottom: 36px;
}
.trust-points {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  padding-top: 20px;
  border-top: 1px solid var(--border-subtle);
}
.trust-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--text-secondary);
}

/* Phone Mockup */
.hero-mockup {
  display: flex;
  justify-content: center;
}
.phone-frame {
  width: 320px;
  height: 600px;
  background: #151A24;
  border-radius: 44px;
  padding: 12px;
  border: 4px solid #293245;
  box-shadow: 0 25px 60px rgba(0, 0, 0, 0.7), 0 0 30px rgba(0, 168, 132, 0.15);
  position: relative;
}
.phone-speaker {
  width: 50px;
  height: 4px;
  background: #293245;
  border-radius: 2px;
  position: absolute;
  top: 14px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 10;
}
.phone-camera {
  width: 10px;
  height: 10px;
  background: #000;
  border-radius: 50%;
  position: absolute;
  top: 11px;
  left: 36%;
  z-index: 10;
}
.phone-screen {
  width: 100%;
  height: 100%;
  background: var(--bg-canvas);
  border-radius: 34px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  position: relative;
  border: 1px solid rgba(255, 255, 255, 0.05);
}

.app-header {
  background: var(--bg-surface-elevated);
  padding: 16px 14px 12px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--border-subtle);
}
.app-title-row {
  display: flex;
  align-items: center;
  gap: 6px;
}
.app-logo-text {
  font-family: var(--font-heading);
  font-size: 16px;
  font-weight: 700;
  color: var(--text-primary);
}
.app-drive-chip {
  background: rgba(0, 168, 132, 0.2);
  color: var(--primary-teal);
  font-size: 9px;
  font-weight: 800;
  padding: 1px 5px;
  border-radius: 4px;
}
.app-icons {
  display: flex;
  align-items: center;
  gap: 8px;
}
.icon-circle {
  font-size: 12px;
  color: var(--text-secondary);
}
.icon-avatar {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: linear-gradient(135deg, #0F766E, #047857);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 10px;
  font-weight: bold;
  border: 1px solid var(--primary-teal);
}

.app-filter-tabs {
  background: var(--bg-surface-elevated);
  padding: 0 12px 10px;
  display: flex;
  gap: 6px;
}
.filter-tab {
  font-size: 11px;
  padding: 3px 10px;
  border-radius: 12px;
  background: var(--bg-card);
  color: var(--text-secondary);
  font-weight: 500;
}
.filter-tab.active {
  background: rgba(0, 168, 132, 0.25);
  color: var(--whatsapp-green);
  border: 1px solid var(--primary-teal);
}

.app-chat-list {
  flex: 1;
  padding: 6px 0;
  overflow-y: hidden;
}
.chat-row {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  border-bottom: 1px solid rgba(34, 45, 52, 0.5);
}
.avatar-folder {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  flex-shrink: 0;
}
.teal-grad { background: linear-gradient(135deg, #0F766E, #047857); }
.blue-grad { background: linear-gradient(135deg, #1E3A8A, #2563EB); }
.purple-grad { background: linear-gradient(135deg, #6B21A8, #9333EA); }
.orange-grad { background: linear-gradient(135deg, #9A3412, #EA580C); }

.chat-details {
  flex: 1;
  min-width: 0;
}
.chat-top {
  display: flex;
  justify-content: space-between;
  margin-bottom: 2px;
}
.chat-name {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.chat-time {
  font-size: 10px;
  color: var(--text-muted);
}
.chat-sub {
  font-size: 11px;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 4px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.tick-blue {
  color: var(--whatsapp-blue);
  font-size: 11px;
  font-weight: bold;
}
.app-fab {
  position: absolute;
  bottom: 16px;
  right: 16px;
  width: 44px;
  height: 44px;
  background: var(--primary-teal);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.4);
}

/* Features Section */
.features-section {
  padding: 100px 0;
  border-top: 1px solid var(--border-subtle);
}
.section-header {
  text-align: center;
  max-width: 650px;
  margin: 0 auto 50px;
}
.section-tag {
  color: var(--primary-teal);
  font-size: 13px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 10px;
  display: inline-block;
}
.section-title {
  font-size: 36px;
  margin-bottom: 16px;
}
.section-desc {
  color: var(--text-secondary);
  font-size: 16px;
}

.feature-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}
.feature-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 36px 28px;
  transition: all 0.25s ease;
}
.feature-card:hover {
  transform: translateY(-4px);
  border-color: rgba(0, 168, 132, 0.4);
  box-shadow: var(--shadow-md);
}
.card-icon {
  width: 52px;
  height: 52px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-subtle);
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent);
  margin-bottom: 22px;
}
.feature-card h3 {
  font-size: 20px;
  margin-bottom: 12px;
}
.feature-card p {
  color: var(--text-secondary);
  font-size: 14.5px;
  line-height: 1.55;
}

/* Steps Section */
.how-section {
  padding: 40px 0 90px;
}
.steps-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.step-card {
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 30px 24px;
  position: relative;
}
.step-num {
  font-family: var(--font-heading);
  font-size: 28px;
  font-weight: 800;
  color: var(--primary-teal);
  opacity: 0.8;
  margin-bottom: 14px;
}
.step-card h4 {
  font-size: 18px;
  margin-bottom: 10px;
}
.step-card p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* Hub & Download Section */
.hub-section {
  padding: 60px 0 100px;
}
.hub-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}
.hub-header {
  background: var(--bg-surface-elevated);
  border-bottom: 1px solid var(--border-subtle);
  padding: 8px 16px;
}
.hub-tabs {
  display: flex;
  gap: 12px;
}
.hub-tab {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  font-family: var(--font-heading);
  font-size: 14.5px;
  font-weight: 600;
  padding: 12px 20px;
  border-radius: 12px;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 8px;
  transition: all 0.2s;
}
.hub-tab:hover {
  color: var(--text-primary);
}
.hub-tab.active {
  background: rgba(0, 168, 132, 0.15);
  color: var(--whatsapp-green);
  border: 1px solid rgba(0, 168, 132, 0.35);
}

.hub-body {
  padding: 44px;
}
.form-intro {
  margin-bottom: 28px;
}
.form-intro h3 {
  font-size: 24px;
  margin-bottom: 8px;
}
.form-intro p {
  color: var(--text-secondary);
  font-size: 15px;
}

.tester-form {
  display: flex;
  flex-direction: column;
  gap: 20px;
}
.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}
.form-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.form-group label {
  font-size: 13.5px;
  font-weight: 600;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.required-badge {
  font-size: 11px;
  color: var(--whatsapp-green);
  font-weight: 500;
  background: rgba(37, 211, 102, 0.12);
  padding: 2px 6px;
  border-radius: 4px;
}
.form-group input,
.form-group select {
  background: var(--bg-input);
  border: 1px solid var(--border-subtle);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: 14.5px;
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  outline: none;
  transition: border-color 0.2s;
}
.form-group input:focus,
.form-group select:focus {
  border-color: var(--primary-teal);
  box-shadow: 0 0 0 3px rgba(0, 168, 132, 0.2);
}

.submit-success {
  background: rgba(0, 168, 132, 0.12);
  border: 1px solid var(--primary-teal);
  border-radius: var(--radius-md);
  padding: 24px;
  display: flex;
  align-items: center;
  gap: 18px;
  margin-top: 24px;
}
.success-icon {
  width: 44px;
  height: 44px;
  background: var(--primary-teal);
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  font-weight: bold;
  flex-shrink: 0;
}
.success-text h4 {
  font-size: 17px;
  margin-bottom: 4px;
}
.success-text p {
  color: var(--text-secondary);
  font-size: 13.5px;
}

/* Download View */
.download-container {
  display: flex;
  flex-direction: column;
  gap: 32px;
}
.apk-card {
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 32px;
  display: flex;
  align-items: center;
  gap: 24px;
}
.apk-icon {
  width: 72px;
  height: 72px;
  background: rgba(0, 168, 132, 0.12);
  border: 1px solid rgba(0, 168, 132, 0.3);
  border-radius: 18px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.apk-info {
  flex: 1;
}
.apk-badge {
  display: inline-block;
  background: rgba(83, 189, 235, 0.15);
  color: var(--whatsapp-blue);
  font-size: 11px;
  font-weight: 700;
  padding: 3px 8px;
  border-radius: 6px;
  margin-bottom: 6px;
}
.apk-info h3 {
  font-size: 22px;
  margin-bottom: 6px;
}
.apk-info p {
  color: var(--text-secondary);
  font-size: 13px;
}
.apk-info code {
  color: var(--whatsapp-green);
  background: rgba(0, 0, 0, 0.3);
  padding: 2px 6px;
  border-radius: 4px;
}

.install-guide {
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 24px;
}
.install-guide h4 {
  font-size: 16px;
  margin-bottom: 12px;
}
.install-guide ol {
  padding-left: 20px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.install-guide li {
  color: var(--text-secondary);
  font-size: 14px;
}
.install-guide strong {
  color: var(--text-primary);
}

/* Admin Modal */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.75);
  backdrop-filter: blur(10px);
  z-index: 999;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}
.modal-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  max-width: 800px;
  width: 100%;
  max-height: 85vh;
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-lg);
}
.modal-header {
  padding: 20px 24px;
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.modal-title {
  display: flex;
  align-items: center;
  gap: 10px;
}
.modal-title h3 {
  font-size: 18px;
}
.btn-close {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  font-size: 20px;
  cursor: pointer;
  padding: 4px 8px;
}
.modal-body {
  padding: 24px;
  overflow-y: auto;
}
.admin-help {
  font-size: 13.5px;
  color: var(--text-secondary);
  margin-bottom: 16px;
  background: var(--bg-surface-elevated);
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  border-left: 3px solid var(--primary-teal);
}
.admin-actions-bar {
  display: flex;
  gap: 10px;
  margin-bottom: 16px;
}
.testers-table-wrapper {
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  overflow-x: auto;
}
.testers-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 13px;
}
.testers-table th {
  background: var(--bg-surface-elevated);
  padding: 10px 14px;
  color: var(--text-muted);
  font-weight: 600;
  border-bottom: 1px solid var(--border-subtle);
}
.testers-table td {
  padding: 10px 14px;
  color: var(--text-primary);
  border-bottom: 1px solid rgba(34, 45, 52, 0.4);
}
.no-testers {
  padding: 30px;
  text-align: center;
  color: var(--text-muted);
  font-size: 13.5px;
}

/* Footer */
.footer {
  border-top: 1px solid var(--border-subtle);
  padding: 40px 0;
  background: var(--bg-surface);
}
.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 13px;
  color: var(--text-muted);
}

/* Responsive */
@media (max-width: 900px) {
  .hero-grid {
    grid-template-columns: 1fr;
    text-align: center;
    gap: 40px;
  }
  .hero-subtitle {
    margin: 0 auto 30px;
  }
  .hero-actions {
    justify-content: center;
  }
  .trust-points {
    justify-content: center;
  }
  .feature-cards,
  .steps-grid {
    grid-template-columns: 1fr;
  }
  .form-row {
    grid-template-columns: 1fr;
  }
  .apk-card {
    flex-direction: column;
    text-align: center;
  }
  .apk-action {
    width: 100%;
  }
}