/* ─── OPENDROP PREMIUM DESIGN SYSTEM ─── */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Outfit:wght@400;500;600;700;800&family=Fira+Code:wght@400;500&display=swap');

:root {
  /* Fonts */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-title: 'Outfit', var(--font-sans);
  --font-mono: 'Fira Code', monospace;

  /* Theme Tokens - Dark Mode (Default) */
  --bg-color: #08080a;
  --bg-grid: rgba(255, 255, 255, 0.015);
  --radial-glow: radial-gradient(circle at 50% -20%, rgba(200, 241, 53, 0.15) 0%, rgba(74, 222, 128, 0.05) 50%, rgba(8, 8, 10, 0) 100%);
  
  --surface-glass: rgba(15, 15, 20, 0.65);
  --surface-solid: #111115;
  --border-glass: rgba(255, 255, 255, 0.08);
  --border-hover: rgba(200, 241, 53, 0.3);
  
  --text-primary: #f3f4f6;
  --text-secondary: #9ca3af;
  --text-muted: #6b7280;
  
  /* Accent Colors */
  --accent-primary: #c8f135;       /* Lime Green */
  --accent-secondary: #4ade80;     /* Electric Green */
  --accent-gradient: linear-gradient(135deg, #c8f135 0%, #4ade80 100%);
  --accent-glow: 0 0 20px rgba(200, 241, 53, 0.35);
  --accent-glow-subtle: 0 0 10px rgba(200, 241, 53, 0.15);
  
  --success: #10b981;              /* Emerald */
  --success-glow: 0 0 15px rgba(16, 185, 129, 0.25);
  --warning: #f59e0b;              /* Amber */
  --destructive: #f43f5e;          /* Rose */
  --destructive-glow: 0 0 15px rgba(244, 63, 94, 0.25);
  
  --shadow-sm: 0 2px 8px rgba(0,0,0,0.4);
  --shadow-md: 0 8px 30px rgba(0,0,0,0.5);
  --shadow-lg: 0 12px 40px rgba(0,0,0,0.7);

  /* Transitions */
  --ease-smooth: cubic-bezier(0.4, 0, 0.2, 1);
  --transition-fast: 0.15s var(--ease-smooth);
  --transition-normal: 0.25s var(--ease-smooth);
  --transition-slow: 0.4s var(--ease-smooth);
}

/* Light Theme Overrides */
[data-theme="light"] {
  --bg-color: #f6f8fa;
  --bg-grid: rgba(0, 0, 0, 0.015);
  --radial-glow: radial-gradient(circle at 50% -20%, rgba(122, 184, 0, 0.08) 0%, rgba(22, 163, 74, 0.03) 50%, rgba(246, 248, 250, 0) 100%);
  
  --surface-glass: rgba(255, 255, 255, 0.7);
  --surface-solid: #ffffff;
  --border-glass: rgba(0, 0, 0, 0.08);
  --border-hover: rgba(122, 184, 0, 0.35);
  
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #94a3b8;
  
  /* Accent Colors */
  --accent-primary: #7ab800;       /* Olive Green */
  --accent-secondary: #16a34a;     /* Forest Green */
  --accent-gradient: linear-gradient(135deg, #7ab800 0%, #16a34a 100%);
  --accent-glow: 0 0 15px rgba(122, 184, 0, 0.2);
  --accent-glow-subtle: 0 0 8px rgba(122, 184, 0, 0.1);
  
  --success: #059669;
  --success-glow: 0 0 10px rgba(5, 150, 105, 0.15);
  --warning: #d97706;
  --destructive: #e11d48;
  --destructive-glow: 0 0 10px rgba(225, 29, 72, 0.15);
  
  --shadow-sm: 0 2px 8px rgba(0,0,0,0.05);
  --shadow-md: 0 8px 30px rgba(0,0,0,0.08);
  --shadow-lg: 0 12px 40px rgba(0,0,0,0.12);
}

/* ─── RESET & BASE ─── */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  scrollbar-width: thin;
  scrollbar-color: var(--border-glass) transparent;
}

/* Webkit Scrollbars */
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}
::-webkit-scrollbar-track {
  background: transparent;
}
::-webkit-scrollbar-thumb {
  background-color: var(--border-glass);
  border-radius: 20px;
}
::-webkit-scrollbar-thumb:hover {
  background-color: var(--accent-primary);
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-color);
  background-image: 
    linear-gradient(var(--bg-grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--bg-grid) 1px, transparent 1px);
  background-size: 40px 40px;
  background-position: center;
  color: var(--text-primary);
  min-height: 100vh;
  position: relative;
  overflow-x: hidden;
  line-height: 1.5;
}

body::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--radial-glow);
  pointer-events: none;
  z-index: 0;
}

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

/* Typography */
h1, h2, h3, h4 {
  font-family: var(--font-title);
  font-weight: 700;
  letter-spacing: -0.02em;
}

code, .code-font {
  font-family: var(--font-mono);
  font-size: 0.9em;
}

/* ─── GLASSMORPHISM UTILITY ─── */
.glass-panel {
  background: var(--surface-glass);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border-glass);
  border-radius: 16px;
  box-shadow: var(--shadow-md);
  transition: border-color var(--transition-normal), box-shadow var(--transition-normal);
}

.glass-panel:hover {
  border-color: var(--border-hover);
}

/* ─── NAVIGATION ─── */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  padding: 1.25rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: rgba(8, 8, 10, 0.4);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border-glass);
  transition: background var(--transition-normal);
}

[data-theme="light"] .navbar {
  background: rgba(246, 248, 250, 0.4);
}

.nav-brand {
  font-family: var(--font-title);
  font-size: 1.5rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.nav-brand span {
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 2rem;
}

.nav-link {
  font-weight: 500;
  font-size: 0.95rem;
  color: var(--text-secondary);
  position: relative;
  transition: color var(--transition-fast);
}

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

.nav-link::after {
  content: "";
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent-primary);
  transition: width var(--transition-normal);
}

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

.nav-actions {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

/* ─── BUTTONS ─── */
.btn {
  font-family: var(--font-title);
  font-weight: 600;
  font-size: 0.95rem;
  padding: 0.6rem 1.25rem;
  border-radius: 10px;
  border: 1px solid var(--border-glass);
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-primary);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  transition: all var(--transition-fast);
}

.btn:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: var(--border-hover);
  box-shadow: 0 4px 12px rgba(0,0,0,0.15);
  transform: translateY(-1px);
}

.btn:active {
  transform: translateY(0);
}

.btn.accent {
  background: var(--accent-gradient);
  border: none;
  color: #050507;
  box-shadow: var(--accent-glow-subtle);
}

.btn.accent:hover {
  box-shadow: var(--accent-glow);
  filter: brightness(1.1);
  transform: translateY(-1.5px);
}

.btn.destructive {
  background: rgba(244, 63, 94, 0.1);
  border-color: rgba(244, 63, 94, 0.3);
  color: var(--destructive);
}

.btn.destructive:hover {
  background: var(--destructive);
  color: #fff;
  border-color: var(--destructive);
  box-shadow: var(--destructive-glow);
}

.theme-toggle {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: 1px solid var(--border-glass);
  background: rgba(255, 255, 255, 0.04);
  color: var(--text-primary);
  font-size: 1.2rem;
  cursor: pointer;
  display: flex;
  justify-content: center;
  align-items: center;
  transition: all var(--transition-fast);
}

.theme-toggle:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: var(--accent-primary);
  box-shadow: var(--accent-glow-subtle);
}

/* ─── LANDING PAGE LAYOUT ─── */
.landing-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 4rem 2rem;
  position: relative;
  z-index: 1;
}

/* Hero Section */
.hero-sec {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 4rem;
  align-items: center;
  margin-bottom: 6rem;
}

.hero-left {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.hero-tag {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--accent-primary);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.hero-tag::before {
  content: "";
  display: inline-block;
  width: 8px;
  height: 8px;
  background: var(--accent-primary);
  border-radius: 50%;
  box-shadow: var(--accent-glow);
}

.hero-title {
  font-size: 3.5rem;
  line-height: 1.1;
  letter-spacing: -0.04em;
}

.hero-title span {
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: 1.1rem;
  color: var(--text-secondary);
  max-width: 520px;
}

.hero-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1rem;
}

.pill {
  font-size: 0.8rem;
  font-weight: 500;
  padding: 0.4rem 0.9rem;
  border-radius: 20px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-glass);
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

/* Interactive Simulator */
.sim-card {
  padding: 2rem;
  position: relative;
  overflow: hidden;
}

.sim-screen {
  background: rgba(0,0,0,0.25);
  border-radius: 12px;
  padding: 1.5rem;
  border: 1px solid rgba(255,255,255,0.03);
}

.sim-devices {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 2rem;
  position: relative;
}

.sim-device {
  text-align: center;
  position: relative;
  z-index: 2;
}

.sim-device svg {
  width: 64px;
  height: 64px;
  color: var(--accent-primary);
  filter: drop-shadow(0 0 8px rgba(200, 241, 53, 0.2));
}

.sim-device.phone svg {
  color: var(--accent-secondary);
  filter: drop-shadow(0 0 8px rgba(74, 222, 128, 0.2));
}

.sim-device p {
  font-family: var(--font-title);
  font-weight: 600;
  font-size: 0.85rem;
  margin-top: 0.5rem;
  color: var(--text-secondary);
}

.sim-connection-path {
  position: absolute;
  top: 32px;
  left: 64px;
  right: 64px;
  height: 2px;
  background: dashed var(--border-glass);
  z-index: 1;
}

.sim-particle {
  position: absolute;
  top: 24px;
  left: 20%;
  width: 16px;
  height: 16px;
  background: var(--accent-primary);
  border-radius: 50%;
  box-shadow: var(--accent-glow);
  opacity: 0;
  z-index: 10;
}

@keyframes flow {
  0% {
    left: 20%;
    opacity: 0;
    transform: scale(0.6);
  }
  10% {
    opacity: 1;
    transform: scale(1);
  }
  90% {
    opacity: 1;
    transform: scale(1);
  }
  100% {
    left: 80%;
    opacity: 0;
    transform: scale(0.6);
  }
}

.sim-particle.active {
  animation: flow 2s linear infinite;
}

.sim-progress-block {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.sim-meta {
  display: flex;
  justify-content: space-between;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-secondary);
}

.sim-progress-track {
  height: 8px;
  background: rgba(255,255,255,0.05);
  border-radius: 4px;
  overflow: hidden;
}

.sim-progress-fill {
  width: 0%;
  height: 100%;
  background: var(--accent-gradient);
  border-radius: 4px;
  transition: width 0.1s linear;
}

.sim-stats {
  display: flex;
  justify-content: space-between;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  margin-top: 0.5rem;
}

.sim-speed {
  color: var(--accent-primary);
  font-weight: 600;
}

/* Feature Grid */
.features-sec {
  margin-bottom: 6rem;
}

.section-hdr {
  text-align: center;
  margin-bottom: 3.5rem;
}

.section-tag {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--accent-primary);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.section-h {
  font-size: 2.25rem;
  margin-top: 0.5rem;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

.feature-card {
  padding: 2.5rem 2rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.f-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: rgba(200, 241, 53, 0.08);
  border: 1px solid rgba(200, 241, 53, 0.2);
  color: var(--accent-primary);
  display: flex;
  justify-content: center;
  align-items: center;
  font-size: 1.5rem;
}

.feature-card:nth-child(2) .f-icon {
  background: rgba(74, 222, 128, 0.08);
  border: 1px solid rgba(74, 222, 128, 0.2);
  color: var(--accent-secondary);
}

.feature-card:nth-child(3) .f-icon {
  background: rgba(245, 158, 11, 0.08);
  border: 1px solid rgba(245, 158, 11, 0.2);
  color: var(--warning);
}

.f-title {
  font-size: 1.25rem;
  font-family: var(--font-title);
  font-weight: 700;
}

.f-desc {
  color: var(--text-secondary);
  font-size: 0.9rem;
  line-height: 1.6;
}

/* Stats Section */
.stats-bar {
  padding: 2.5rem;
  display: flex;
  justify-content: space-around;
  text-align: center;
  margin-bottom: 6rem;
}

.stat-v {
  font-family: var(--font-title);
  font-size: 2.5rem;
  font-weight: 800;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.stat-l {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-top: 0.25rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* Footer */
.footer {
  border-top: 1px solid var(--border-glass);
  padding: 3rem 0;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.9rem;
}

.footer-logo {
  font-family: var(--font-title);
  font-weight: 800;
  font-size: 1.25rem;
  color: var(--text-secondary);
  margin-bottom: 0.75rem;
}

.footer-logo span {
  color: var(--accent-primary);
}

.footer-nav {
  display: flex;
  justify-content: center;
  gap: 2rem;
  margin: 1.5rem 0;
}

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

/* ─── FILE EXCHANGE DASHBOARD LAYOUT ─── */
.app-container {
  max-width: 1000px;
  margin: 2rem auto;
  padding: 0 2rem;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  position: relative;
  z-index: 1;
}

.encryption-banner {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.8rem 1.25rem;
  border-radius: 12px;
  background: rgba(16, 185, 129, 0.04);
  border: 1px solid rgba(16, 185, 129, 0.15);
  font-size: 0.85rem;
  color: var(--success);
}

.encryption-banner svg {
  width: 16px;
  height: 16px;
}

/* Step 1: Entrance */
.entrance-card {
  padding: 3rem 2.5rem;
  max-width: 520px;
  margin: 4rem auto;
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.entrance-hdr {
  text-align: center;
}

.entrance-logo {
  font-size: 2.25rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: 0.5rem;
}

.entrance-logo span {
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

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

.entrance-form {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.input-grp {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.input-grp label {
  font-family: var(--font-title);
  font-weight: 600;
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.form-input {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-glass);
  border-radius: 10px;
  padding: 0.75rem 1rem;
  color: var(--text-primary);
  font-size: 0.95rem;
  font-family: inherit;
  transition: all var(--transition-fast);
}

.form-input:focus {
  outline: none;
  background: rgba(255, 255, 255, 0.05);
  border-color: var(--accent-primary);
  box-shadow: var(--accent-glow-subtle);
}

.room-input-row {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 0.75rem;
}

/* Saved Rooms */
.saved-rooms {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.saved-rooms h4 {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
}

.saved-room-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.saved-room-chip {
  padding: 0.4rem 0.8rem;
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-glass);
  font-size: 0.8rem;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.saved-room-chip:hover {
  background: rgba(45, 212, 191, 0.05);
  border-color: var(--accent-primary);
  color: var(--accent-primary);
}

/* Step 2: Room View */
.room-layout {
  display: grid;
  grid-template-columns: 340px 1fr;
  gap: 1.5rem;
  align-items: start;
}

.room-sidebar {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.room-main {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

/* Sidebar Details */
.room-info-card {
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.room-code-display {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.code-title {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
}

.code-badge {
  padding: 0.75rem 1rem;
  background: rgba(0,0,0,0.15);
  border-radius: 8px;
  border: 1px solid var(--border-glass);
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 1.1rem;
  color: var(--accent-primary);
  text-align: center;
  cursor: pointer;
  position: relative;
  transition: all var(--transition-fast);
}

.code-badge:hover {
  background: rgba(45, 212, 191, 0.05);
  border-color: var(--accent-primary);
}

.code-badge::after {
  content: "Click to Copy";
  position: absolute;
  bottom: -22px;
  left: 50%;
  transform: translateX(-50%);
  font-size: 0.65rem;
  font-family: var(--font-sans);
  color: var(--text-muted);
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.code-badge:hover::after {
  opacity: 1;
}

.status-indicator {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.6rem 0.9rem;
  border-radius: 8px;
  background: rgba(255,255,255,0.02);
  border: 1px solid var(--border-glass);
}

.status-pulse {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--accent-primary);
  box-shadow: var(--accent-glow-subtle);
  position: relative;
}

.status-pulse::after {
  content: "";
  position: absolute;
  top: -3px;
  left: -3px;
  right: -3px;
  bottom: -3px;
  border-radius: 50%;
  border: 2px solid var(--accent-primary);
  opacity: 0.4;
  animation: pulse 1.8s infinite var(--ease-smooth);
}

@keyframes pulse {
  0% {
    transform: scale(0.8);
    opacity: 0.6;
  }
  100% {
    transform: scale(2);
    opacity: 0;
  }
}

.status-indicator.connecting .status-pulse {
  background: var(--warning);
}
.status-indicator.connecting .status-pulse::after {
  border-color: var(--warning);
}

.status-indicator.disconnected .status-pulse {
  background: var(--destructive);
  box-shadow: none;
}
.status-indicator.disconnected .status-pulse::after {
  display: none;
}

.status-lbl {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-secondary);
}

/* Peer Mesh Visualizer */
.mesh-card {
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.mesh-hdr {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.mesh-hdr h3 {
  font-size: 1rem;
  font-family: var(--font-title);
  color: var(--text-primary);
}

.mesh-count {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  padding: 0.2rem 0.5rem;
  border-radius: 12px;
  background: rgba(255,255,255,0.05);
  border: 1px solid var(--border-glass);
}

.mesh-canvas-container {
  position: relative;
  width: 100%;
  height: 180px;
  background: rgba(0,0,0,0.15);
  border-radius: 10px;
  overflow: hidden;
  border: 1px solid rgba(255,255,255,0.02);
}

.mesh-canvas {
  width: 100%;
  height: 100%;
  display: block;
}

/* Admin panel */
.admin-card {
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.admin-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--border-glass);
  padding-bottom: 0.5rem;
}

.admin-header h3 {
  font-size: 1rem;
  color: var(--text-primary);
}

.admin-badge {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 600;
  padding: 0.2rem 0.6rem;
  border-radius: 20px;
  background: rgba(45, 212, 191, 0.1);
  border: 1px solid rgba(45, 212, 191, 0.25);
  color: var(--accent-primary);
}

.admin-row {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.admin-row label {
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-secondary);
}

.admin-toggle-btn {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: rgba(255,255,255,0.02);
  border: 1px solid var(--border-glass);
  border-radius: 10px;
  padding: 0.6rem 0.9rem;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.admin-toggle-btn:hover {
  border-color: var(--border-hover);
}

.admin-toggle-indicator {
  width: 42px;
  height: 24px;
  border-radius: 12px;
  background: rgba(255,255,255,0.1);
  position: relative;
  transition: background var(--transition-normal);
}

.admin-toggle-indicator::after {
  content: "";
  position: absolute;
  top: 3px;
  left: 3px;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: #fff;
  transition: left var(--transition-normal);
}

.admin-toggle-btn.active .admin-toggle-indicator {
  background: var(--accent-primary);
}

.admin-toggle-btn.active .admin-toggle-indicator::after {
  left: 21px;
}

/* Configurable settings panel */
.config-card {
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.config-toggle {
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.config-body {
  display: none;
  flex-direction: column;
  gap: 1rem;
  margin-top: 0.5rem;
}

.config-body.open {
  display: flex;
}

.config-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
}

/* Dropzone & Drag-over states */
.dropzone-card {
  padding: 2.5rem;
  text-align: center;
  border: 2px dashed var(--border-glass);
  border-radius: 16px;
  background: rgba(255,255,255,0.01);
  cursor: pointer;
  position: relative;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 0.75rem;
  transition: all var(--transition-normal);
}

.dropzone-card:hover {
  border-color: var(--accent-primary);
  background: rgba(45, 212, 191, 0.015);
}

.dropzone-card.drag-over {
  border-color: var(--accent-primary);
  background: rgba(45, 212, 191, 0.05);
  box-shadow: var(--accent-glow-subtle);
  transform: scale(0.99);
}

.dropzone-icon {
  font-size: 2.5rem;
  color: var(--text-muted);
  transition: color var(--transition-normal), transform var(--transition-normal);
}

.dropzone-card:hover .dropzone-icon, 
.dropzone-card.drag-over .dropzone-icon {
  color: var(--accent-primary);
  transform: translateY(-4px);
}

.dropzone-card.drag-over .dropzone-icon {
  animation: bounce 0.6s infinite alternate;
}

@keyframes bounce {
  to { transform: translateY(-8px); }
}

.dropzone-title {
  font-family: var(--font-title);
  font-weight: 700;
  font-size: 1.1rem;
}

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

.hidden-file-input {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  cursor: pointer;
}

/* Tabs switcher */
.tabs-header {
  display: flex;
  gap: 0.5rem;
  border-bottom: 1px solid var(--border-glass);
  margin-bottom: 0.5rem;
}

.tab-trigger {
  padding: 0.6rem 1.25rem;
  background: transparent;
  border: none;
  border-bottom: 2px solid transparent;
  font-family: var(--font-title);
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.tab-trigger:hover {
  color: var(--text-primary);
}

.tab-trigger.active {
  color: var(--accent-primary);
  border-bottom-color: var(--accent-primary);
}

.tab-pane {
  display: none;
}

.tab-pane.active {
  display: block;
}

/* TextInput Styles */
.text-pane-content {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.textarea-box {
  min-height: 140px;
  resize: vertical;
  background: rgba(0,0,0,0.15);
}

.text-actions-bar {
  display: flex;
  justify-content: flex-end;
  gap: 0.75rem;
}

/* Previews list before sending */
.preview-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-top: 1rem;
}

.preview-item {
  padding: 0.75rem 1rem;
  border-radius: 12px;
  background: rgba(255,255,255,0.02);
  border: 1px solid var(--border-glass);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.preview-info {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  min-width: 0;
}

.preview-type-icon {
  font-size: 1.5rem;
}

.preview-details {
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.preview-name {
  font-weight: 600;
  font-size: 0.9rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.preview-size {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
}

.preview-remove {
  font-size: 1.1rem;
  color: var(--text-muted);
  cursor: pointer;
  background: none;
  border: none;
  transition: color var(--transition-fast);
}

.preview-remove:hover {
  color: var(--destructive);
}

.preview-send-btn {
  margin-top: 1rem;
  align-self: flex-end;
}

/* Activity logs and Transfer cards */
.activity-card {
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.activity-hdr {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.activity-hdr h3 {
  font-size: 1rem;
  font-family: var(--font-title);
  color: var(--text-primary);
}

.activity-clear {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  transition: color var(--transition-fast);
}

.activity-clear:hover {
  color: var(--destructive);
}

.activity-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.activity-empty {
  text-align: center;
  padding: 2.5rem;
  color: var(--text-muted);
  font-size: 0.9rem;
  font-style: italic;
  border: 1px dashed var(--border-glass);
  border-radius: 12px;
}

.transfer-card {
  padding: 1rem;
  border-radius: 12px;
  background: rgba(255,255,255,0.02);
  border: 1px solid var(--border-glass);
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  position: relative;
  overflow: hidden;
  transition: all var(--transition-fast);
}

.transfer-card::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  background: var(--border-glass);
}

.transfer-card.outgoing::before {
  background: var(--accent-primary);
}

.transfer-card.incoming::before {
  background: var(--accent-secondary);
}

.transfer-card.completed::before {
  background: var(--success);
}

.transfer-card.cancelled::before,
.transfer-card.failed::before {
  background: var(--destructive);
}

.transfer-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.transfer-info {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  min-width: 0;
}

.transfer-icon {
  font-size: 1.5rem;
}

.transfer-title-block {
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.transfer-title {
  font-weight: 600;
  font-size: 0.9rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.transfer-subtitle {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
}

.transfer-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.transfer-btn {
  padding: 0.3rem 0.6rem;
  border-radius: 6px;
  font-size: 0.75rem;
}

.transfer-progress-block {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.transfer-progress-track {
  height: 6px;
  background: rgba(255,255,255,0.05);
  border-radius: 3px;
  overflow: hidden;
}

.transfer-progress-fill {
  height: 100%;
  background: var(--accent-gradient);
  border-radius: 3px;
  width: 0%;
  transition: width 0.1s linear;
}

.transfer-progress-fill.success {
  background: var(--success);
}

.transfer-stats-bar {
  display: flex;
  justify-content: space-between;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-secondary);
}

.transfer-speed {
  color: var(--accent-primary);
  font-weight: 600;
}

.transfer-card.text-message {
  padding: 1.25rem;
}

.text-message-bubble {
  background: rgba(0,0,0,0.15);
  border-radius: 8px;
  padding: 0.75rem 1rem;
  font-size: 0.9rem;
  word-break: break-word;
  white-space: pre-wrap;
  border: 1px solid rgba(255,255,255,0.02);
}

/* Warnings and Alerts Banner */
.alert-banner {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  padding: 0.8rem 1.25rem;
  border-radius: 12px;
  background: rgba(245, 158, 11, 0.04);
  border: 1px solid rgba(245, 158, 11, 0.15);
  font-size: 0.85rem;
  color: var(--warning);
  line-height: 1.4;
}

.alert-banner svg {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
  margin-top: 2px;
}

/* Permission System Card inline */
.permission-card {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-top: 0.5rem;
  padding: 0.5rem;
  border-radius: 8px;
  background: rgba(255,255,255,0.03);
  border: 1px solid var(--border-glass);
}

.permission-lbl {
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-secondary);
  flex-grow: 1;
}

.permission-btn {
  padding: 0.4rem 0.8rem;
  font-size: 0.75rem;
}

/* QR Code & Share modal popup */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  z-index: 200;
  display: flex;
  justify-content: center;
  align-items: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-normal);
}

.modal-overlay.open {
  opacity: 1;
  pointer-events: auto;
}

.modal-content {
  width: 90%;
  max-width: 400px;
  padding: 2rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.5rem;
  transform: translateY(20px);
  transition: transform var(--transition-normal);
}

.modal-overlay.open .modal-content {
  transform: translateY(0);
}

.modal-title {
  font-size: 1.25rem;
  font-family: var(--font-title);
  font-weight: 700;
  text-align: center;
}

.qr-canvas-holder {
  background: #fff;
  padding: 1rem;
  border-radius: 12px;
  display: flex;
  justify-content: center;
  align-items: center;
  box-shadow: var(--shadow-md);
}

.qr-canvas-holder canvas, .qr-canvas-holder img {
  display: block;
}

.modal-room-lbl {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 1rem;
  color: var(--accent-primary);
}

/* ─── RESPONSIVE RULES ─── */
@media (max-width: 1024px) {
  .hero-sec {
    grid-template-columns: 1fr;
    gap: 3rem;
  }
  
  .room-layout {
    grid-template-columns: 1fr;
  }
  
  .room-sidebar {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
  }
}

@media (max-width: 768px) {
  .navbar {
    padding: 1rem 1.5rem;
  }
  
  .nav-links {
    display: none; /* simple hamburger fallback or hide */
  }
  
  .hero-title {
    font-size: 2.75rem;
  }
  
  .features-grid {
    grid-template-columns: 1fr;
  }
  
  .room-sidebar {
    grid-template-columns: 1fr;
  }
  
  .stats-bar {
    flex-direction: column;
    gap: 2rem;
  }
}