/* ============ CSS Variables ============ */
:root {
  /* Colors - Dark brutalist theme with neon accents */
  --bg-primary: #0a0a0f;
  --bg-secondary: #12121a;
  --bg-tertiary: #1a1a24;
  --bg-card: #16161f;
  
  --text-primary: #f0f0f5;
  --text-secondary: #8888a0;
  --text-muted: #5a5a70;
  
  --accent-primary: #00ff88;
  --accent-secondary: #ff3366;
  --accent-warning: #ffaa00;
  --accent-glow: rgba(0, 255, 136, 0.15);
  
  --border-color: #2a2a3a;
  --border-highlight: #3a3a4a;
  
  /* Typography */
  --font-display: 'Outfit', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
  
  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  
  /* Border radius */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  
  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-normal: 250ms ease;
  --transition-slow: 400ms ease;
}

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

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-display);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
  position: relative;
}

/* ============ Background Effects ============ */
.noise {
  position: fixed;
  inset: 0;
  pointer-events: none;
  opacity: 0.03;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)'/%3E%3C/svg%3E");
  z-index: 1000;
}

.gradient-bg {
  position: fixed;
  inset: 0;
  pointer-events: none;
  background: 
    radial-gradient(ellipse 80% 50% at 50% -20%, rgba(0, 255, 136, 0.08), transparent),
    radial-gradient(ellipse 60% 40% at 80% 100%, rgba(255, 51, 102, 0.06), transparent),
    radial-gradient(ellipse 50% 30% at 10% 60%, rgba(88, 88, 255, 0.04), transparent);
  z-index: -1;
}

/* ============ Layout ============ */
.container {
  width: 100%;
  max-width: 680px;
  margin: 0 auto;
  padding: var(--space-md);
  padding-top: var(--space-xl);
  padding-bottom: var(--space-2xl);
}

@media (min-width: 640px) {
  .container {
    padding: var(--space-xl);
    padding-top: var(--space-2xl);
  }
}

@media (min-width: 768px) {
  .container {
    max-width: 720px;
    padding-top: 4rem;
  }
}

@media (min-width: 1024px) {
  .container {
    max-width: 800px;
  }
  
  .features-grid {
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-md);
  }
  
  .feature {
    padding: var(--space-md);
  }
  
  .feature-icon {
    font-size: 1.5rem;
    margin-bottom: var(--space-xs);
  }
  
  .feature h3 {
    font-size: 0.8rem;
  }
  
  .feature p {
    font-size: 0.7rem;
    line-height: 1.4;
  }
}

/* ============ Header ============ */
.header {
  text-align: center;
  margin-bottom: var(--space-xl);
  animation: fadeInDown 0.6s ease-out;
}

.logo {
  font-size: clamp(1.75rem, 6vw, 2.5rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
}

.logo-icon {
  font-size: 1.2em;
  filter: drop-shadow(0 0 8px rgba(0, 255, 136, 0.5));
}

.logo-text {
  background: linear-gradient(135deg, var(--text-primary) 0%, var(--text-secondary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.logo-dot {
  -webkit-text-fill-color: var(--accent-primary);
  text-shadow: 0 0 20px var(--accent-primary);
}

.tagline {
  color: var(--text-secondary);
  font-size: clamp(0.875rem, 3vw, 1rem);
  margin-top: var(--space-sm);
  font-weight: 400;
}

/* ============ Loading State ============ */
.loading-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--space-2xl);
  gap: var(--space-md);
}

.spinner {
  width: 40px;
  height: 40px;
  border: 3px solid var(--border-color);
  border-top-color: var(--accent-primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

/* ============ Email Card ============ */
.email-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  margin-bottom: var(--space-lg);
  animation: fadeInUp 0.5s ease-out 0.1s both;
  position: relative;
  overflow: hidden;
}

.email-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--accent-primary), var(--accent-secondary));
}

@media (min-width: 1024px) {
  .email-card {
    padding: var(--space-xl);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
  }
  
  .email-card::before {
    height: 3px;
  }
}

.email-card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-md);
}

.label {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  font-weight: 600;
}

.timer {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: var(--accent-warning);
  background: rgba(255, 170, 0, 0.1);
  padding: var(--space-xs) var(--space-sm);
  border-radius: var(--radius-sm);
}

.timer-icon {
  font-size: 0.9em;
}

.email-address-row {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: var(--space-sm);
  margin-bottom: var(--space-md);
}

.email-address {
  flex: 1;
  font-family: var(--font-mono);
  font-size: clamp(0.9rem, 4vw, 1.125rem);
  color: var(--accent-primary);
  word-break: break-all;
  padding: var(--space-sm);
  text-shadow: 0 0 20px rgba(0, 255, 136, 0.3);
}

.copy-btn {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  background: var(--accent-primary);
  color: var(--bg-primary);
  border: none;
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-sm);
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.875rem;
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.copy-btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(0, 255, 136, 0.3);
}

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

.copy-btn.copied {
  background: var(--accent-secondary);
}

.copy-text {
  display: none;
}

@media (min-width: 480px) {
  .copy-text {
    display: inline;
  }
}

.email-card-actions {
  display: flex;
  gap: var(--space-sm);
}

/* ============ Buttons ============ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-sm);
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 0.875rem;
  cursor: pointer;
  transition: all var(--transition-fast);
  border: 1px solid transparent;
  flex: 1;
}

.btn-secondary {
  background: var(--bg-tertiary);
  color: var(--text-primary);
  border-color: var(--border-color);
}

.btn-secondary:hover {
  background: var(--border-color);
  border-color: var(--border-highlight);
}

.btn-danger {
  background: rgba(255, 51, 102, 0.1);
  color: var(--accent-secondary);
  border-color: rgba(255, 51, 102, 0.3);
}

.btn-danger:hover {
  background: rgba(255, 51, 102, 0.2);
}

/* ============ Inbox Section ============ */
.inbox-section {
  animation: fadeInUp 0.5s ease-out 0.2s both;
}


.inbox-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-md);
}

.inbox-title {
  font-size: 1.125rem;
  font-weight: 600;
}

.email-count {
  font-size: 0.875rem;
  color: var(--text-muted);
}

/* ============ Empty State ============ */
.empty-state {
  text-align: center;
  padding: var(--space-2xl) var(--space-lg);
  background: var(--bg-card);
  border: 1px dashed var(--border-color);
  border-radius: var(--radius-lg);
}

.empty-icon {
  font-size: 3rem;
  margin-bottom: var(--space-md);
  animation: float 3s ease-in-out infinite;
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}

.empty-state h3 {
  font-size: 1.125rem;
  margin-bottom: var(--space-sm);
  color: var(--text-primary);
}

.empty-state p {
  font-size: 0.875rem;
  color: var(--text-secondary);
  max-width: 300px;
  margin: 0 auto;
}

/* ============ Email List ============ */
.email-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.email-item {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: var(--space-md);
  cursor: pointer;
  transition: all var(--transition-fast);
  animation: slideIn 0.3s ease-out;
}

.email-item:hover {
  border-color: var(--accent-primary);
  background: var(--bg-tertiary);
  transform: translateX(4px);
}


.email-item.unread {
  border-left: 3px solid var(--accent-primary);
}

.email-item-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: var(--space-sm);
  margin-bottom: var(--space-xs);
}

.email-from {
  font-weight: 500;
  font-size: 0.9rem;
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  flex: 1;
}

.email-date {
  font-size: 0.75rem;
  color: var(--text-muted);
  white-space: nowrap;
}

.email-subject {
  font-size: 0.875rem;
  color: var(--text-secondary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

@keyframes slideIn {
  from {
    opacity: 0;
    transform: translateX(-20px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

/* ============ Modal ============ */
.modal {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: flex;
  align-items: flex-end;
  justify-content: center;
}

@media (min-width: 640px) {
  .modal {
    align-items: center;
    padding: var(--space-lg);
  }
}

.modal-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.8);
  backdrop-filter: blur(4px);
  animation: fadeIn 0.2s ease-out;
}

.modal-content {
  position: relative;
  width: 100%;
  max-width: 700px;
  max-height: 90vh;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
  display: flex;
  flex-direction: column;
  animation: slideUp 0.3s ease-out;
}

@media (min-width: 640px) {
  .modal-content {
    border-radius: var(--radius-lg);
    max-height: 80vh;
  }
}

@media (min-width: 1024px) {
  .modal-content {
    max-width: 900px;
    max-height: 85vh;
  }
  
  #email-frame {
    min-height: 500px;
  }
}

.modal-header {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-md) var(--space-lg);
  border-bottom: 1px solid var(--border-color);
  background: var(--bg-card);
}

.modal-back {
  background: none;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  padding: var(--space-sm);
  margin: calc(-1 * var(--space-sm));
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.modal-back:hover {
  color: var(--text-primary);
  background: var(--bg-tertiary);
}

.modal-title-area {
  flex: 1;
  min-width: 0;
}

.modal-subject {
  font-size: 1rem;
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.modal-meta {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: var(--space-xs);
}

.modal-body {
  flex: 1;
  overflow: hidden;
}

#email-frame {
  width: 100%;
  height: 100%;
  min-height: 400px;
  border: none;
  background: #fff;
}

@keyframes slideUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

/* ============ Toast ============ */
.toast-container {
  position: fixed;
  bottom: var(--space-lg);
  left: 50%;
  transform: translateX(-50%);
  z-index: 200;
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  pointer-events: none;
}

.toast {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  padding: var(--space-sm) var(--space-lg);
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
  animation: toastIn 0.3s ease-out;
  pointer-events: auto;
}

.toast.success {
  border-color: var(--accent-primary);
  color: var(--accent-primary);
}

.toast.error {
  border-color: var(--accent-secondary);
  color: var(--accent-secondary);
}

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

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

@keyframes toastOut {
  to {
    opacity: 0;
    transform: translateY(-10px) scale(0.9);
  }
}

/* ============ Features Section ============ */
.features-section {
  margin-top: var(--space-xl);
  padding-top: var(--space-xl);
  border-top: 1px solid var(--border-color);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-lg);
}

@media (max-width: 600px) {
  .features-grid {
    grid-template-columns: 1fr;
    gap: var(--space-md);
  }
}

.feature {
  text-align: center;
  padding: var(--space-lg);
  background: var(--bg-secondary);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  transition: border-color var(--transition-fast), transform var(--transition-fast);
}

.feature:hover {
  border-color: var(--border-highlight);
  transform: translateY(-2px);
}

.feature-icon {
  font-size: 2rem;
  display: block;
  margin-bottom: var(--space-sm);
}

.feature h3 {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--space-xs);
}

.feature p {
  font-size: 0.8rem;
  color: var(--text-muted);
  line-height: 1.5;
  margin: 0;
}

/* ============ Screen Reader Only ============ */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ============ Footer ============ */
.footer {
  text-align: center;
  padding: var(--space-xl) var(--space-lg);
  color: var(--text-muted);
  font-size: 0.8rem;
  max-width: 500px;
  margin: 0 auto;
  line-height: 1.6;
}

@media (min-width: 1024px) {
  .footer {
    padding: var(--space-2xl) var(--space-lg);
    max-width: 700px;
    font-size: 0.875rem;
  }
}

.footer a {
  color: var(--text-secondary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.footer a:hover {
  color: var(--accent-primary);
}

/* ============ Utilities ============ */
.hidden {
  display: none !important;
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeInDown {
  from {
    opacity: 0;
    transform: translateY(-20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ============ Scrollbar ============ */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: var(--bg-primary);
}

::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--border-highlight);
}

/* ============ Selection ============ */
::selection {
  background: var(--accent-primary);
  color: var(--bg-primary);
}