/* ════════════════════════════════════════════════════════════
   AAIBA DROP — Redesigned Stylesheet
   Theme: Clean Minimalist with Subtle Accents
   Fonts: Inter (body) + Space Grotesk (headings)
   ═══════════════════════════════════════════════════════════ */

/* ── Color Tokens ─────────────────────────────────────────── */
:root {
  --bg-primary: #0f0f0f;
  --bg-secondary: #1a1a1a;
  --bg-tertiary: #212121;
  --bg-elevated: rgba(33, 33, 33, 0.7);
  
  --text-primary: #ffffff;
  --text-secondary: #a0a0a0;
  --text-muted: #666666;
  
  --accent-primary: #6366f1;
  --accent-secondary: #8b5cf6;
  --accent-tertiary: #ec4899;
  
  --success: #10b981;
  --warning: #f59e0b;
  --error: #ef4444;
  
  --border: #2a2a2a;
  --border-light: rgba(42, 42, 42, 0.3);
  
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-full: 9999px;
  
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-heading: 'Space Grotesk', 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Courier New', monospace;
  
  --transition-fast: 150ms ease;
  --transition-medium: 300ms ease;
  --transition-slow: 500ms ease;
}

/* ── Base Styles ──────────────────────────────────────────── */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

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

body::before {
  content: '';
  position: fixed;
  inset: 0;
  background: 
    radial-gradient(circle at 20% 30%, rgba(99, 102, 241, 0.08) 0%, transparent 40%),
    radial-gradient(circle at 80% 70%, rgba(139, 92, 246, 0.05) 0%, transparent 40%);
  pointer-events: none;
  z-index: -2;
}

/* ── Scanline Effect ─────────────────────────────────────── */
.scanline {
  pointer-events: none;
  position: fixed;
  inset: 0;
  z-index: 9999;
  background: repeating-linear-gradient(
    to bottom,
    transparent 0px,
    transparent 1px,
    rgba(0, 0, 0, 0.03) 1px,
    rgba(0, 0, 0, 0.03) 2px
  );
  opacity: 0.5;
  animation: scanlineMove 8s linear infinite;
}

@keyframes scanlineMove {
  0% {
    background-position: 0 0;
  }
  100% {
    background-position: 0 100vh;
  }
}

/* ════════════════════ LOGIN PAGE ════════════════════════════ */
.login-page {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  overflow: hidden;
  position: relative;
}

.login-bg {
  position: fixed;
  inset: 0;
  z-index: -2;
  background: 
    radial-gradient(circle at 20% 30%, rgba(99, 102, 241, 0.08) 0%, transparent 40%),
    radial-gradient(circle at 80% 70%, rgba(139, 92, 246, 0.05) 0%, transparent 40%),
    var(--bg-primary);
}

.grid-overlay {
  position: absolute;
  inset: 0;
  z-index: -1;
  background-image:
    linear-gradient(var(--border) 1px, transparent 1px),
    linear-gradient(90deg, var(--border) 1px, transparent 1px);
  background-size: 60px 60px;
  opacity: 0.15;
  pointer-events: none;
}

.login-shell {
  position: relative;
  z-index: 10;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2rem;
  width: 100%;
  max-width: 440px;
  padding: 2rem;
  animation: fadeUp 0.5s ease both;
}

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

.login-brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.login-card {
  width: 100%;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-top: 2px solid var(--accent-primary);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
  box-shadow: var(--shadow-md);
  backdrop-filter: saturate(180%) blur(8px);
}

.login-card__header {
  margin-bottom: 2rem;
  border-bottom: 1px solid var(--border-light);
  padding-bottom: 1.5rem;
}

.login-card__header h1 {
  font-family: var(--font-heading);
  font-size: 2.5rem;
  font-weight: 600;
  letter-spacing: -0.5px;
  line-height: 1;
  color: var(--text-primary);
  margin: 0;
}

.login-card__header p {
  font-size: 0.875rem;
  color: var(--text-secondary);
  letter-spacing: 0.05em;
  margin-top: 0.5rem;
}

.login-form {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  width: 100%;
}

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

.field label {
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  color: var(--text-secondary);
  font-weight: 500;
  text-transform: uppercase;
}

.field input {
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 0.95rem;
  padding: 0.875rem 1rem;
  transition: border-color var(--transition-medium), box-shadow var(--transition-medium);
  outline: none;
  caret-color: var(--accent-primary);
  width: 100%;
}

.field input:focus {
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.15);
}

.field input::placeholder {
  color: var(--text-muted);
}

/* ── Primary button (shared with dashboard) ───────────────────────────── */
.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  font-family: var(--font-sans);
  font-size: 0.875rem;
  font-weight: 600;
  color: white;
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
  border: none;
  border-radius: var(--radius-md);
  padding: 0.75rem 1.5rem;
  cursor: pointer;
  transition: all var(--transition-medium);
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  width: 100%;
}

.btn-primary:hover:not(:disabled) {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

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

.btn-primary:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

.btn-primary svg {
  transition: transform var(--transition-medium);
}

.btn-primary:hover svg {
  transform: translateX(2px) rotate(15deg);
}

.error-msg {
  font-size: 0.75rem;
  color: var(--error);
  letter-spacing: 0.05em;
  min-height: 1.2em;
  transition: opacity 0.3s;
}

.login-footer {
  font-size: 0.75rem;
  color: var(--text-muted);
  letter-spacing: 0.1em;
}

/* ── Responsive ───────────────────────────────────────────── */
@media (max-width: 480px) {
  .login-shell {
    padding: 1.5rem;
  }
  
  .login-card {
    padding: 2rem;
  }
  
  .login-card__header h1 {
    font-size: 2rem;
  }
}

/* ── Header Styles ───────────────────────────────────────── */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.25rem 2rem;
  height: 4.5rem;
  background: var(--bg-elevated);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-light);
}

.site-header__left,
.site-header__right {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.brand-mark {
  font-size: 1.75rem;
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  font-weight: 700;
  letter-spacing: -0.5px;
}

.brand-name {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 600;
  letter-spacing: -0.5px;
  white-space: nowrap;
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--success);
  position: relative;
  animation: pulse 2s ease-in-out infinite;
}

.status-dot::after {
  content: '';
  position: absolute;
  inset: -2px;
  border-radius: 50%;
  border: 1px solid rgba(16, 185, 129, 0.3);
  opacity: 0;
  animation: pulseRing 2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% {
    transform: scale(0.95);
    opacity: 1;
  }
  50% {
    transform: scale(1);
    opacity: 0.7;
  }
}

@keyframes pulseRing {
  0% {
    transform: scale(0.8);
    opacity: 0;
  }
  50% {
    opacity: 0.6;
  }
  100% {
    transform: scale(1.5);
    opacity: 0;
  }
}

.item-count {
  font-size: 0.875rem;
  color: var(--text-secondary);
  font-weight: 500;
  padding: 0.25rem 0.75rem;
  background: var(--bg-tertiary);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
}

.btn-logout {
  font-family: var(--font-sans);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--error);
  background: transparent;
  border: 1px solid var(--error);
  border-radius: var(--radius-sm);
  padding: 0.375rem 1rem;
  cursor: pointer;
  transition: all var(--transition-medium);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.btn-logout:hover {
  background: var(--error);
  color: white;
  transform: translateY(-1px);
}

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

/* ── Main Layout ─────────────────────────────────────────── */
.main {
  max-width: 960px;
  margin: 0 auto;
  padding: 2rem;
  display: flex;
  flex-direction: column;
  gap: 2rem;
  min-height: calc(100vh - 4.5rem);
}

/* ── Composer Section ────────────────────────────────────── */
.composer {
  background: var(--bg-secondary);
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
  backdrop-filter: saturate(180%) blur(8px);
}

.composer__tabs {
  display: flex;
  border-bottom: 1px solid var(--border-light);
  background: var(--bg-tertiary);
}

.tab {
  flex: 1;
  padding: 1rem;
  font-family: var(--font-sans);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-muted);
  background: transparent;
  border: none;
  border-bottom: 2px solid transparent;
  cursor: pointer;
  transition: all var(--transition-medium);
  position: relative;
  overflow: hidden;
}

.tab:hover {
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.02);
}

.tab.active {
  color: var(--text-primary);
  border-bottom-color: var(--accent-primary);
  background: var(--bg-tertiary);
}

.tab.active::before {
  content: '';
  position: absolute;
  bottom: -1px;
  left: 0;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, var(--accent-primary), var(--accent-secondary));
}

.composer__panel {
  display: none;
  padding: 1.75rem;
}

.composer__panel.active {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Text Input Styles */
#text-input {
  width: 100%;
  min-height: 160px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 0.95rem;
  line-height: 1.7;
  padding: 1.25rem;
  resize: vertical;
  outline: none;
  transition: all var(--transition-medium);
  caret-color: var(--accent-primary);
}

#text-input:focus {
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.15);
  background: var(--bg-secondary);
}

#text-input::placeholder {
  color: var(--text-muted);
  font-size: 0.875rem;
}

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

.char-count {
  font-size: 0.875rem;
  color: var(--text-muted);
  font-variant-numeric: tabular-nums;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  font-family: var(--font-sans);
  font-size: 0.875rem;
  font-weight: 600;
  color: white;
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
  border: none;
  border-radius: var(--radius-md);
  padding: 0.75rem 1.5rem;
  cursor: pointer;
  transition: all var(--transition-medium);
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.btn-primary:hover:not(:disabled) {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

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

.btn-primary:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

.btn-primary svg {
  transition: transform var(--transition-medium);
}

.btn-primary:hover svg {
  transform: translateX(2px) rotate(15deg);
}

/* Drop Zone Styles */
.drop-zone {
  border: 2px dashed var(--border);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
  text-align: center;
  cursor: pointer;
  transition: all var(--transition-medium);
  position: relative;
  background: var(--bg-tertiary);
}

.drop-zone:hover {
  border-color: var(--accent-primary);
  background: rgba(99, 102, 241, 0.05);
  transform: scale(1.01);
}

.drop-zone.drag-over {
  border-color: var(--accent-primary);
  background: rgba(99, 102, 241, 0.1);
  border-style: solid;
  transform: scale(1.02);
}

.drop-zone__icon {
  font-size: 3.5rem;
  margin-bottom: 1rem;
  display: block;
  opacity: 0.7;
  filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.2));
}

.drop-zone__title {
  font-family: var(--font-heading);
  font-size: 1.75rem;
  font-weight: 600;
  letter-spacing: -0.5px;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
}

.drop-zone__sub {
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.link-btn {
  background: none;
  border: none;
  cursor: pointer;
  color: var(--accent-primary);
  font-family: var(--font-sans);
  font-size: 0.875rem;
  text-decoration: underline;
  text-underline-offset: 2px;
  transition: color var(--transition-fast);
}

.link-btn:hover {
  color: var(--accent-secondary);
}

.upload-progress {
  margin-top: 1.5rem;
  width: 100%;
}

.upload-progress__bar {
  height: 4px;
  background: var(--bg-tertiary);
  border-radius: 2px;
  overflow: hidden;
  margin-bottom: 0.75rem;
}

.upload-progress__fill {
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, var(--accent-primary), var(--accent-secondary));
  border-radius: 2px;
  transition: width 0.3s ease;
}

.upload-progress span {
  font-size: 0.875rem;
  color: var(--text-secondary);
  font-variant-numeric: tabular-nums;
}

/* Feed Section Styles */
.feed-section {
  flex: 1;
}

.feed-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.5rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--border-light);
}

.feed-header h2 {
  font-family: var(--font-heading);
  font-size: 1.875rem;
  font-weight: 600;
  letter-spacing: -0.5px;
  color: var(--text-primary);
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.btn-icon {
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  font-size: 1rem;
  cursor: pointer;
  transition: all var(--transition-medium);
  position: relative;
  overflow: hidden;
}

.btn-icon:hover {
  background: var(--border);
  color: var(--text-primary);
  transform: rotate(-15deg) scale(1.1);
}

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

.btn-icon.spinning {
  animation: spin 0.8s linear infinite;
}

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

/* Feed Styles */
.feed {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.feed-empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1.5rem;
  padding: 3rem 2rem;
  color: var(--text-muted);
  text-align: center;
}

.feed-empty__icon {
  font-size: 4rem;
  opacity: 0.2;
  animation: float 4s ease-in-out infinite;
}

@keyframes float {
  0%, 100% {
    transform: translateY(0px);
  }
  50% {
    transform: translateY(-10px);
  }
}

.feed-empty p {
  font-size: 1rem;
  max-width: 280px;
  line-height: 1.5;
}

/* Item Card Styles */
.item-card {
  display: flex;
  align-items: flex-start;
  gap: 1.25rem;
  padding: 1.25rem;
  border-bottom: 1px solid var(--border-light);
  background: var(--bg-tertiary);
  transition: all var(--transition-medium);
  position: relative;
  overflow: hidden;
}

.item-card:hover {
  background: rgba(255, 255, 255, 0.03);
  transform: translateX(2px);
}

.item-card:last-child {
  border-bottom: none;
}

.item-card__type {
  flex-shrink: 0;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  position: relative;
  overflow: hidden;
}

.item-card__type.file-type {
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
  color: white;
  border: none;
}

.item-card__type::before {
  content: '';
  position: absolute;
  inset: 0;
  background: inherit;
  opacity: 0.7;
  filter: blur(4px);
  z-index: -1;
}

.item-card__body {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
}

.item-card__meta {
  font-size: 0.75rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-variant-numeric: tabular-nums;
  margin-bottom: 0.5rem;
}

.item-card__meta::before {
  content: '';
  display: inline-block;
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--accent-primary);
}

.item-card__text {
  font-size: 0.95rem;
  line-height: 1.6;
  color: var(--text-primary);
  white-space: pre-wrap;
  word-break: break-word;
  flex: 1;
  margin-bottom: 1rem;
  font-family: var(--font-sans);
}

.item-card__text.long-text {
  max-height: 96px;
  overflow: hidden;
  position: relative;
}

.item-card__text.long-text::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 40px;
  background: linear-gradient(to top, var(--bg-tertiary), transparent);
  pointer-events: none;
}

.expand-btn {
  background: none;
  border: none;
  cursor: pointer;
  color: var(--accent-primary);
  font-family: var(--font-sans);
  font-size: 0.875rem;
  font-weight: 500;
  letter-spacing: -0.25px;
  padding: 0.25rem 0.5rem;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
}

.expand-btn:hover {
  color: var(--accent-secondary);
  background: rgba(99, 102, 241, 0.1);
}

.expand-btn svg {
  transition: transform var(--transition-fast);
}

.expand-btn:hover svg {
  transform: translateX(2px);
}

.copy-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-sans);
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--text-secondary);
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.5rem 0.75rem;
  cursor: pointer;
  transition: all var(--transition-medium);
}

.copy-btn:hover {
  color: var(--accent-primary);
  border-color: var(--accent-primary);
  background: rgba(99, 102, 241, 0.05);
}

.copy-btn.copied {
  color: var(--success);
  border-color: var(--success);
  background: rgba(16, 185, 129, 0.1);
}

.copy-btn.copied:hover {
  background: rgba(16, 185, 129, 0.2);
}

.download-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-sans);
  font-size: 0.875rem;
  color: var(--accent-primary);
  text-decoration: none;
  font-weight: 500;
  transition: all var(--transition-medium);
}

.download-link:hover {
  color: var(--accent-secondary);
  opacity: 0.85;
}

.download-link .file-size {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.item-card__actions {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  align-items: flex-start;
}

.delete-btn {
  background: transparent;
  border: 1px solid transparent;
  color: var(--text-muted);
  font-family: var(--font-sans);
  font-size: 0.8125rem;
  font-weight: 500;
  padding: 0.375rem 0.75rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition-medium);
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

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

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

/* Toast Styles */
.toast {
  position: fixed;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent-primary);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 0.875rem;
  font-weight: 500;
  padding: 1rem 1.5rem;
  border-radius: var(--radius-md);
  opacity: 0;
  pointer-events: none;
  z-index: 2000;
  transition: all var(--transition-medium);
  box-shadow: var(--shadow-lg);
  backdrop-filter: blur(12px);
  max-width: 90%;
  max-height: 120px;
  overflow-y: auto;
}

.toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

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

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

.toast.warning {
  border-left-color: var(--warning);
}

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

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

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

::-webkit-scrollbar-thumb:hover {
  background: rgba(255, 255, 255, 0.2);
}

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

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

/* Responsive Design */
@media (max-width: 768px) {
  .main {
    padding: 1.5rem;
  }
  
  .site-header {
    padding: 1rem 1.5rem;
    height: 4rem;
  }
  
  .brand-name {
    font-size: 1.25rem;
  }
  
  .brand-mark {
    font-size: 1.5rem;
  }
  
  .composer__panel {
    padding: 1.25rem;
  }
  
  #text-input {
    min-height: 140px;
    padding: 1rem;
  }
  
  .composer__actions {
    flex-direction: column;
    align-items: stretch;
  }
  
  .btn-primary {
    width: 100%;
    justify-content: center;
  }
  
  .drop-zone {
    padding: 1.75rem;
  }
  
  .drop-zone__title {
    font-size: 1.5rem;
  }
  
  .feed-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 1rem;
  }
  
  .feed-empty {
    padding: 2rem 1rem;
  }
  
  .feed-empty__icon {
    font-size: 3rem;
  }
  
  .item-card {
    flex-direction: column;
    align-items: stretch;
    padding: 1rem;
  }
  
  .item-card__type {
    align-self: center;
  }
  
  .item-card__actions {
    flex-direction: row;
    justify-content: flex-end;
    width: 100%;
  }
}

@media (max-width: 480px) {
  .site-header {
    flex-wrap: wrap;
    gap: 0.75rem;
  }
  
  .site-header__left,
  .site-header__right {
    width: 100%;
    justify-content: space-between;
  }
  
  .brand-name {
    font-size: 1.125rem;
  }
  
  .brand-mark {
    font-size: 1.25rem;
  }
  
  .main {
    padding: 1rem;
  }
  
  .composer__tabs {
    display: grid;
    grid-template-columns: 1fr 1fr;
  }
  
  .tab {
    padding: 0.75rem;
    font-size: 0.75rem;
  }
  
  .composer__panel {
    padding: 1rem;
  }
  
  #text-input {
    min-height: 120px;
    font-size: 0.875rem;
  }
  
  .composer__actions {
    gap: 0.75rem;
  }
  
  .btn-primary {
    padding: 0.625rem 1rem;
    font-size: 0.75rem;
  }
  
  .drop-zone__title {
    font-size: 1.25rem;
  }
  
  .feed-header h2 {
    font-size: 1.5rem;
  }
  
  .item-card__meta {
    font-size: 0.6875rem;
    flex-wrap: wrap;
  }
  
  .item-card__text {
    font-size: 0.875rem;
  }
}