@font-face {
  font-family: 'berkeley';
  src: url('/font/berkeley.woff2') format('woff2'),
       url('/font/berkeley.ttf') format('truetype');
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}

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

:root {
  --bg: #0a0a0a;
  --bg-secondary: #111111;
  --bg-tertiary: #161616;
  --bg-elevated: #1c1c1c;
  --text: #e8e8e8;
  --text-secondary: #737373;
  --text-tertiary: #525252;
  --accent: #7c3aed;
  --accent-hover: #8b5cf6;
  --accent-glow: rgba(124, 58, 237, 0.15);
  --slack: #4a154b;
  --slack-light: #e879f9;
  --discord: #5865f2;
  --discord-light: #a5b4fc;
  --success: #22c55e;
  --error: #ef4444;
  --border: #262626;
  --border-subtle: #1f1f1f;
}

body {
  font-family: 'berkeley', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  line-height: 1.6;
  background-image:
    radial-gradient(ellipse 80% 50% at 50% -20%, rgba(124, 58, 237, 0.08), transparent);
}

.container {
  max-width: 720px;
  margin: 0 auto;
  padding: 3rem 1.5rem;
}

/* header */
header {
  text-align: center;
  margin-bottom: 3.5rem;
}

.header-icon {
  margin-bottom: 1.25rem;
  filter: drop-shadow(0 0 40px rgba(124, 58, 237, 0.3));
  transition: filter 0.4s ease;
}

.header-icon:hover {
  filter: drop-shadow(0 0 50px rgba(124, 58, 237, 0.5));
}

h1, h2, h3, .section-title, .connection-label {
  font-weight: 600;
}

h1 {
  font-size: 2.75rem;
  margin-bottom: 0.625rem;
  letter-spacing: -0.03em;
  background: linear-gradient(135deg, var(--text) 0%, var(--text-secondary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.tagline {
  color: var(--text-secondary);
  font-size: 1rem;
  letter-spacing: 0.01em;
}

/* sections */
.section {
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: 16px;
  padding: 1.75rem;
  margin-bottom: 1.25rem;
  box-shadow:
    0 0 0 1px rgba(255, 255, 255, 0.02) inset,
    0 4px 24px -8px rgba(0, 0, 0, 0.4);
}

.section-title {
  font-size: 0.8rem;
  margin-bottom: 1.25rem;
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

/* connections grid */
.connections {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

@media (max-width: 600px) {
  .connections {
    grid-template-columns: 1fr;
  }
}

.connection-card {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-subtle);
  border-radius: 12px;
  padding: 1.25rem;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.connection-card:hover {
  border-color: var(--border);
  box-shadow: 0 2px 12px -4px rgba(0, 0, 0, 0.3);
}

.connection-header {
  display: flex;
  align-items: center;
  gap: 0.625rem;
  margin-bottom: 1rem;
  padding-bottom: 0.875rem;
  border-bottom: 1px solid var(--border-subtle);
}

.connection-icon {
  width: 18px;
  height: 18px;
}

.connection-label {
  font-size: 0.875rem;
  letter-spacing: 0.01em;
}

.connected-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: var(--bg);
  padding: 0.75rem 1rem;
  border-radius: 8px;
  margin-bottom: 0.625rem;
  font-size: 0.875rem;
  border: 1px solid transparent;
  transition: border-color 0.15s ease;
}

.connected-item:hover {
  border-color: var(--border-subtle);
}

.connected-item:last-child {
  margin-bottom: 0;
}

.connected-name {
  color: var(--text);
}

.disconnect-btn {
  background: none;
  border: none;
  color: var(--text-tertiary);
  cursor: pointer;
  font-family: inherit;
  font-size: 0.75rem;
  padding: 0.375rem 0.625rem;
  border-radius: 6px;
  transition: all 0.15s ease;
}

.disconnect-btn:hover {
  color: var(--error);
  background: rgba(239, 68, 68, 0.1);
}

.connect-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.875rem 1.25rem;
  border: none;
  border-radius: 10px;
  font-family: inherit;
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
  text-decoration: none;
  color: white;
  width: 100%;
  position: relative;
  overflow: hidden;
}

.connect-btn::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(255,255,255,0.1) 0%, transparent 50%);
  pointer-events: none;
}

.connect-btn.slack {
  background: linear-gradient(135deg, #5c1a5d 0%, var(--slack) 100%);
  box-shadow: 0 2px 12px -3px rgba(74, 21, 75, 0.5);
}

.connect-btn.slack:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 16px -3px rgba(74, 21, 75, 0.6);
}

.connect-btn.discord {
  background: linear-gradient(135deg, #6875f5 0%, var(--discord) 100%);
  box-shadow: 0 2px 12px -3px rgba(88, 101, 242, 0.5);
}

.connect-btn.discord:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 16px -3px rgba(88, 101, 242, 0.6);
}

/* mapping form */
.mapping-form {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 1rem;
  align-items: end;
}

.form-arrow {
  color: var(--text-tertiary);
  font-size: 1.125rem;
  padding-bottom: 0.875rem;
  opacity: 0.6;
}

@media (max-width: 600px) {
  .form-row {
    grid-template-columns: 1fr;
  }
  .form-arrow {
    text-align: center;
    padding: 0.25rem 0;
  }
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.form-group label {
  font-size: 0.75rem;
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.form-group select {
  padding: 0.875rem 1rem;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--bg-tertiary);
  color: var(--text);
  font-family: inherit;
  font-size: 0.875rem;
  cursor: pointer;
  transition: all 0.15s ease;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%23737373' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.875rem center;
  padding-right: 2.5rem;
}

.form-group select:hover {
  border-color: #3a3a3a;
}

.form-group select:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

.form-group select:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.add-btn {
  padding: 1rem 1.5rem;
  border: none;
  border-radius: 10px;
  background: var(--accent);
  color: white;
  font-family: inherit;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
  width: 100%;
  position: relative;
  overflow: hidden;
  box-shadow: 0 2px 12px -3px rgba(124, 58, 237, 0.4);
}

.add-btn::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(255,255,255,0.12) 0%, transparent 50%);
  pointer-events: none;
}

.add-btn:hover:not(:disabled) {
  background: var(--accent-hover);
  transform: translateY(-1px);
  box-shadow: 0 4px 20px -4px rgba(124, 58, 237, 0.5);
}

.add-btn:active:not(:disabled) {
  transform: translateY(0);
}

.add-btn:disabled {
  background: var(--bg-tertiary);
  color: var(--text-tertiary);
  cursor: not-allowed;
  box-shadow: none;
}

.add-btn:disabled::before {
  display: none;
}

/* mappings list */
.mappings-list {
  margin-top: 1.75rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border-subtle);
}

.mapping-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: var(--bg-tertiary);
  padding: 1rem 1.25rem;
  border-radius: 10px;
  margin-bottom: 0.625rem;
  border: 1px solid var(--border-subtle);
  transition: border-color 0.15s ease;
}

.mapping-item:hover {
  border-color: var(--border);
}

.mapping-item:last-child {
  margin-bottom: 0;
}

.mapping-channels {
  display: flex;
  align-items: center;
  gap: 0.875rem;
  font-size: 0.875rem;
}

.channel-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  padding: 0.4rem 0.75rem;
  border-radius: 6px;
  font-size: 0.8rem;
  font-weight: 500;
}

.channel-tag.slack {
  background: rgba(74, 21, 75, 0.25);
  color: var(--slack-light);
  border: 1px solid rgba(232, 121, 249, 0.15);
}

.channel-tag.discord {
  background: rgba(88, 101, 242, 0.2);
  color: var(--discord-light);
  border: 1px solid rgba(165, 180, 252, 0.15);
}

.mapping-actions {
  display: flex;
  gap: 0.5rem;
}

.toggle-btn, .delete-btn {
  background: var(--bg);
  border: 1px solid var(--border-subtle);
  border-radius: 6px;
  padding: 0.4rem 0.75rem;
  font-family: inherit;
  font-size: 0.75rem;
  cursor: pointer;
  transition: all 0.15s ease;
  color: var(--text-secondary);
}

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

.toggle-btn.active {
  background: rgba(34, 197, 94, 0.1);
  border-color: rgba(34, 197, 94, 0.3);
  color: var(--success);
}

.delete-btn:hover {
  border-color: rgba(239, 68, 68, 0.4);
  color: var(--error);
  background: rgba(239, 68, 68, 0.08);
}

.empty-state {
  text-align: center;
  padding: 2.5rem 1rem;
  color: var(--text-tertiary);
  font-size: 0.9rem;
}

/* toast */
.toast {
  position: fixed;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  padding: 0.875rem 1.5rem;
  border-radius: 10px;
  font-size: 0.875rem;
  z-index: 1000;
  animation: toastIn 0.3s cubic-bezier(0.21, 1.02, 0.73, 1);
  box-shadow: 0 8px 32px -8px rgba(0, 0, 0, 0.5);
}

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

.toast.error {
  background: var(--error);
  color: white;
}

@keyframes toastIn {
  from {
    opacity: 0;
    transform: translateX(-50%) translateY(16px) scale(0.95);
  }
  to {
    opacity: 1;
    transform: translateX(-50%) translateY(0) scale(1);
  }
}

/* footer */
footer {
  text-align: center;
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border-subtle);
  color: var(--text-tertiary);
  font-size: 0.8rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
}

footer a {
  color: var(--text-secondary);
  text-decoration: none;
  transition: color 0.15s ease;
}

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

.github-link {
  display: inline-flex;
  color: var(--text-tertiary);
}

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

/* loading spinner */
.loading {
  display: inline-block;
  width: 16px;
  height: 16px;
  border: 2px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

/* smooth appearance for dynamic content */
@media (prefers-reduced-motion: no-preference) {
  .connection-card,
  .mapping-item,
  .connected-item {
    animation: fadeUp 0.3s ease;
  }
}

@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}