/* ═══════════════════════════════════════════
   NEXUS MESSENGER - MODERN UI IMPROVEMENTS
   Created: 2026-04-22
═══════════════════════════════════════════ */

/* ═══════════════════ ENHANCED VARIABLES */
:root {
  /* Modern Gradients */
  --gradient-brand: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  --gradient-success: linear-gradient(135deg, #0ba360 0%, #3cba92 100%);
  --gradient-danger: linear-gradient(135deg, #f43b47 0%, #453a94 100%);
  --gradient-warning: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
  --gradient-primary: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
  --gradient-dark: linear-gradient(135deg, #434343 0%, #000000 100%);

  /* Glassmorphism */
  --glass-bg: rgba(255, 255, 255, 0.05);
  --glass-border: rgba(255, 255, 255, 0.1);
  --glass-blur: blur(10px);

  /* Enhanced Shadows */
  --shadow-glow: 0 0 20px rgba(88, 101, 242, 0.3);
  --shadow-float: 0 10px 40px rgba(0, 0, 0, 0.3);
  --shadow-hover: 0 5px 20px rgba(0, 0, 0, 0.2);
  --shadow-card: 0 2px 8px rgba(0, 0, 0, 0.15);

  /* Animations */
  --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-bounce: all 0.4s cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

/* ═══════════════════ MODERN BUTTONS */
.btn-modern {
  position: relative;
  padding: 12px 32px;
  border-radius: 12px;
  font-weight: 600;
  font-size: 14px;
  letter-spacing: 0.5px;
  transition: var(--transition-smooth);
  overflow: hidden;
  text-transform: uppercase;
}

.btn-modern::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.2);
  transform: translate(-50%, -50%);
  transition: width 0.6s, height 0.6s;
}

.btn-modern:hover::before {
  width: 300px;
  height: 300px;
}

.btn-modern:active {
  transform: scale(0.95);
}

.btn-primary-modern {
  background: var(--gradient-brand);
  color: white;
  box-shadow: var(--shadow-glow);
}

.btn-primary-modern:hover {
  box-shadow: 0 0 30px rgba(88, 101, 242, 0.5);
  transform: translateY(-2px);
}

.btn-success-modern {
  background: var(--gradient-success);
  color: white;
}

.btn-danger-modern {
  background: var(--gradient-danger);
  color: white;
}

/* ═══════════════════ GLASSMORPHISM CARDS */
.glass-card {
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  border: 1px solid var(--glass-border);
  border-radius: 20px;
  box-shadow: var(--shadow-card);
  transition: var(--transition-smooth);
}

.glass-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-float);
  border-color: rgba(255, 255, 255, 0.2);
}

/* ═══════════════════ ANIMATED INPUTS */
.input-modern {
  position: relative;
  margin: 20px 0;
}

.input-modern input,
.input-modern textarea {
  width: 100%;
  padding: 15px 20px;
  background: rgba(255, 255, 255, 0.03);
  border: 2px solid rgba(255, 255, 255, 0.1);
  border-radius: 12px;
  color: var(--text-normal);
  font-size: 15px;
  transition: var(--transition-smooth);
  outline: none;
}

.input-modern input:focus,
.input-modern textarea:focus {
  border-color: var(--brand);
  background: rgba(255, 255, 255, 0.05);
  box-shadow: 0 0 0 4px rgba(88, 101, 242, 0.1);
}

.input-modern label {
  position: absolute;
  left: 20px;
  top: 15px;
  color: var(--text-muted);
  pointer-events: none;
  transition: var(--transition-smooth);
  background: var(--bg-secondary);
  padding: 0 8px;
}

.input-modern input:focus + label,
.input-modern input:not(:placeholder-shown) + label,
.input-modern textarea:focus + label,
.input-modern textarea:not(:placeholder-shown) + label {
  top: -12px;
  font-size: 12px;
  color: var(--brand);
  font-weight: 600;
}

/* ═══════════════════ FLOATING ANIMATIONS */
@keyframes float {
  0%, 100% { transform: translateY(0px); }
  50% { transform: translateY(-10px); }
}

.float-animation {
  animation: float 3s ease-in-out infinite;
}

@keyframes pulse-glow {
  0%, 100% { box-shadow: 0 0 20px rgba(88, 101, 242, 0.3); }
  50% { box-shadow: 0 0 40px rgba(88, 101, 242, 0.6); }
}

.pulse-glow {
  animation: pulse-glow 2s ease-in-out infinite;
}

/* ═══════════════════ MESSAGE BUBBLES */
.message-bubble {
  position: relative;
  padding: 12px 18px;
  background: var(--bg-secondary);
  border-radius: 18px 18px 18px 4px;
  max-width: 70%;
  transition: var(--transition-smooth);
}

.message-bubble:hover {
  background: var(--bg-accent);
  transform: translateX(5px);
}

.message-bubble::before {
  content: '';
  position: absolute;
  bottom: 0;
  left: -8px;
  width: 0;
  height: 0;
  border-style: solid;
  border-width: 0 8px 8px 0;
  border-color: transparent var(--bg-secondary) transparent transparent;
}

.message-bubble.own {
  border-radius: 18px 18px 4px 18px;
  background: var(--gradient-brand);
  margin-left: auto;
}

.message-bubble.own::before {
  left: auto;
  right: -8px;
  border-width: 0 0 8px 8px;
  border-color: transparent transparent transparent var(--brand);
}

/* ═══════════════════ AVATAR ENHANCEMENTS */
.avatar-modern {
  position: relative;
  border-radius: 50%;
  overflow: hidden;
  transition: var(--transition-smooth);
}

.avatar-modern::after {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: 50%;
  border: 3px solid transparent;
  background: linear-gradient(45deg, var(--brand), var(--green)) border-box;
  -webkit-mask: linear-gradient(#fff 0 0) padding-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  opacity: 0;
  transition: var(--transition-smooth);
}

.avatar-modern:hover::after {
  opacity: 1;
}

.avatar-modern:hover {
  transform: scale(1.1) rotate(5deg);
}

/* ═══════════════════ CALL UI ENHANCEMENTS */
.call-screen-modern {
  background: linear-gradient(135deg, #1e1f22 0%, #2b2d31 50%, #313338 100%);
  position: relative;
  overflow: hidden;
}

.call-screen-modern::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle, rgba(88, 101, 242, 0.1) 0%, transparent 70%);
  animation: rotate-gradient 20s linear infinite;
}

@keyframes rotate-gradient {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

.call-controls-modern {
  display: flex;
  gap: 20px;
  padding: 30px;
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  border-radius: 30px;
  border: 1px solid var(--glass-border);
}

.call-button-modern {
  width: 60px;
  height: 60px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(255, 255, 255, 0.1);
  transition: var(--transition-bounce);
  position: relative;
}

.call-button-modern::before {
  content: '';
  position: absolute;
  inset: -5px;
  border-radius: 50%;
  background: var(--gradient-brand);
  opacity: 0;
  z-index: -1;
  transition: var(--transition-smooth);
}

.call-button-modern:hover::before {
  opacity: 1;
}

.call-button-modern:hover {
  transform: scale(1.2);
}

.call-button-modern.danger {
  background: var(--gradient-danger);
}

.call-button-modern.danger:hover {
  transform: scale(1.2) rotate(135deg);
}

/* ═══════════════════ LOADING ANIMATIONS */
.loading-spinner-modern {
  width: 50px;
  height: 50px;
  border: 4px solid rgba(255, 255, 255, 0.1);
  border-top: 4px solid var(--brand);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

.loading-dots {
  display: flex;
  gap: 8px;
}

.loading-dots span {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--brand);
  animation: bounce-dots 1.4s infinite ease-in-out both;
}

.loading-dots span:nth-child(1) { animation-delay: -0.32s; }
.loading-dots span:nth-child(2) { animation-delay: -0.16s; }

@keyframes bounce-dots {
  0%, 80%, 100% { transform: scale(0); }
  40% { transform: scale(1); }
}

/* ═══════════════════ NOTIFICATION TOASTS */
.toast-modern {
  position: fixed;
  top: 20px;
  right: 20px;
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  border: 1px solid var(--glass-border);
  border-radius: 16px;
  padding: 20px 24px;
  min-width: 300px;
  box-shadow: var(--shadow-float);
  animation: slide-in-right 0.3s ease-out;
  z-index: 10000;
}

@keyframes slide-in-right {
  from {
    transform: translateX(400px);
    opacity: 0;
  }
  to {
    transform: translateX(0);
    opacity: 1;
  }
}

.toast-modern.success {
  border-left: 4px solid var(--green);
}

.toast-modern.error {
  border-left: 4px solid var(--red);
}

.toast-modern.info {
  border-left: 4px solid var(--brand);
}

/* ═══════════════════ MODAL IMPROVEMENTS */
.modal-modern {
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  border: 1px solid var(--glass-border);
  border-radius: 24px;
  box-shadow: var(--shadow-overlay);
  animation: modal-appear 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

@keyframes modal-appear {
  from {
    transform: scale(0.9) translateY(-20px);
    opacity: 0;
  }
  to {
    transform: scale(1) translateY(0);
    opacity: 1;
  }
}

.modal-overlay-modern {
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(5px);
  animation: fade-in 0.3s ease;
}

@keyframes fade-in {
  from { opacity: 0; }
  to { opacity: 1; }
}

/* ═══════════════════ SCROLLBAR MODERN */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: linear-gradient(180deg, var(--brand) 0%, rgba(88, 101, 242, 0.5) 100%);
  border-radius: 10px;
  transition: var(--transition-smooth);
}

::-webkit-scrollbar-thumb:hover {
  background: linear-gradient(180deg, var(--brand-hover) 0%, var(--brand) 100%);
}

/* ═══════════════════ HOVER EFFECTS */
.hover-lift {
  transition: var(--transition-smooth);
}

.hover-lift:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-hover);
}

.hover-glow {
  transition: var(--transition-smooth);
}

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

.hover-scale {
  transition: var(--transition-bounce);
}

.hover-scale:hover {
  transform: scale(1.05);
}

/* ═══════════════════ TEXT GRADIENTS */
.text-gradient-brand {
  background: var(--gradient-brand);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  font-weight: 700;
}

.text-gradient-primary {
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  font-weight: 700;
}

/* ═══════════════════ BADGES */
.badge-modern {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  border-radius: 20px;
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.badge-primary {
  background: var(--gradient-brand);
  color: white;
}

.badge-success {
  background: var(--gradient-success);
  color: white;
}

.badge-danger {
  background: var(--gradient-danger);
  color: white;
}

/* ═══════════════════ PROGRESS BARS */
.progress-modern {
  height: 8px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 10px;
  overflow: hidden;
  position: relative;
}

.progress-bar-modern {
  height: 100%;
  background: var(--gradient-brand);
  border-radius: 10px;
  transition: width 0.3s ease;
  position: relative;
  overflow: hidden;
}

.progress-bar-modern::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  bottom: 0;
  right: 0;
  background: linear-gradient(
    90deg,
    transparent,
    rgba(255, 255, 255, 0.3),
    transparent
  );
  animation: progress-shine 2s infinite;
}

@keyframes progress-shine {
  0% { transform: translateX(-100%); }
  100% { transform: translateX(100%); }
}

/* ═══════════════════ RIPPLE EFFECT */
.ripple {
  position: relative;
  overflow: hidden;
}

.ripple::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.4);
  transform: translate(-50%, -50%);
  transition: width 0.6s, height 0.6s;
}

.ripple:active::after {
  width: 300px;
  height: 300px;
}

/* ═══════════════════ RESPONSIVE */
@media (max-width: 768px) {
  .glass-card {
    border-radius: 16px;
  }

  .btn-modern {
    padding: 10px 24px;
    font-size: 13px;
  }

  .call-controls-modern {
    gap: 15px;
    padding: 20px;
  }

  .call-button-modern {
    width: 50px;
    height: 50px;
  }

  .toast-modern {
    min-width: 280px;
    right: 10px;
  }
}