:root {
  /* Colors - Dark mode (default) */
  --bg: #0a0a0a;
  --surface: #111111;
  --border: #222222;
  --text-primary: #ededed;
  --text-muted: #666666;
  --accent: #7c5cfc;
  --error: #f87171;
  --success: #4ade80;

  /* Typography */
  --font-ui: 'Inter', system-ui, -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, monospace;

  /* Spacing & shapes */
  --radius-input: 8px;
  --radius-btn: 6px;
  --transition: 150ms ease;

  color-scheme: dark;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #fafafa;
    --surface: #ffffff;
    --border: #e5e5e5;
    --text-primary: #171717;
    --text-muted: #a3a3a3;
    --accent: #6d4de6;
    --error: #dc2626;
    --success: #16a34a;
    color-scheme: light;
  }
}

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

body {
  background: var(--bg);
  color: var(--text-primary);
  font-family: var(--font-ui);
  line-height: 1.6;
  min-height: 100vh;
  animation: fadeIn 300ms ease;
}

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

@keyframes copyFlash {
  0% { transform: scale(1); }
  50% { transform: scale(1.2); }
  100% { transform: scale(1); }
}

.container {
  max-width: 720px;
  margin: 0 auto;
  padding: 2rem 1.5rem;
}

/* Header */
.header {
  margin-bottom: 2.5rem;
}

.logo {
  font-size: 1.75rem;
  font-weight: 600;
  letter-spacing: -0.02em;
}

.tagline {
  color: var(--text-muted);
  font-size: 0.95rem;
  margin-top: 0.25rem;
}

/* Textarea */
.textarea-wrapper {
  position: relative;
}

.paste-input {
  width: 100%;
  min-height: 280px;
  padding: 1rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-input);
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 0.9rem;
  line-height: 1.6;
  resize: vertical;
  transition: border-color var(--transition);
  outline: none;
}

.paste-input:focus {
  border-color: var(--accent);
}

.paste-input.has-error {
  border-color: var(--error);
}

.char-counter {
  position: absolute;
  bottom: 0.75rem;
  right: 0.75rem;
  font-size: 0.75rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
  pointer-events: none;
}

.char-counter.over-limit {
  color: var(--error);
}

/* Form controls */
.form-controls {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 1rem;
  gap: 1rem;
  flex-wrap: wrap;
}

.checkbox-label {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.9rem;
  cursor: pointer;
  color: var(--text-muted);
  user-select: none;
}

.checkbox-label input[type="checkbox"] {
  accent-color: var(--accent);
  width: 16px;
  height: 16px;
}

.btn-submit {
  padding: 0.6rem 1.5rem;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: var(--radius-btn);
  font-family: var(--font-ui);
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  transition: opacity var(--transition);
}

.btn-submit:hover:not(:disabled) {
  opacity: 0.9;
}

.btn-submit:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.loading {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

/* Error */
.error-message {
  margin-top: 1rem;
  padding: 0.75rem 1rem;
  background: color-mix(in srgb, var(--error) 10%, transparent);
  border: 1px solid color-mix(in srgb, var(--error) 30%, transparent);
  border-radius: var(--radius-btn);
  color: var(--error);
  font-size: 0.85rem;
}

/* Result card */
.result-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-input);
  padding: 1.5rem;
  animation: fadeIn 200ms ease;
}

.result-card h2 {
  font-size: 1.1rem;
  font-weight: 500;
  margin-bottom: 1rem;
}

.url-row {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  background: var(--bg);
  padding: 0.75rem 1rem;
  border-radius: var(--radius-btn);
  border: 1px solid var(--border);
}

.paste-url {
  flex: 1;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  word-break: break-all;
}

.btn-copy {
  background: none;
  border: 1px solid var(--border);
  border-radius: var(--radius-btn);
  padding: 0.4rem 0.6rem;
  cursor: pointer;
  font-size: 1rem;
  transition: border-color var(--transition);
  color: var(--text-primary);
}

.btn-copy:hover {
  border-color: var(--accent);
}

.result-meta {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-top: 1rem;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.badge-onetime {
  background: color-mix(in srgb, var(--error) 15%, transparent);
  color: var(--error);
  padding: 0.2rem 0.6rem;
  border-radius: 9999px;
  font-size: 0.8rem;
  font-weight: 500;
}

.btn-new {
  margin-top: 1.25rem;
  padding: 0.5rem 1.25rem;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: var(--radius-btn);
  color: var(--text-primary);
  font-family: var(--font-ui);
  font-size: 0.85rem;
  cursor: pointer;
  transition: border-color var(--transition);
}

.btn-new:hover {
  border-color: var(--accent);
}

/* View paste page */
.view-paste {
  animation: fadeIn 200ms ease;
}

.view-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: 1rem;
  gap: 1rem;
  flex-wrap: wrap;
}

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

.countdown {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  color: var(--text-muted);
}

.code-block {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-input);
  overflow: auto;
  max-height: 80vh;
}

.code-block pre {
  padding: 1.25rem;
  margin: 0;
}

.code-block code {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  line-height: 1.7;
  color: var(--text-primary);
  white-space: pre-wrap;
  word-break: break-word;
}

/* Gone / error state */
.gone-message {
  text-align: center;
  padding: 4rem 1rem;
  animation: fadeIn 200ms ease;
}

.gone-message h1 {
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
}

.gone-message p {
  color: var(--text-muted);
  font-size: 1.1rem;
  margin-bottom: 2rem;
}

.btn-home {
  color: var(--accent);
  text-decoration: none;
  font-size: 0.95rem;
  transition: opacity var(--transition);
}

.btn-home:hover {
  opacity: 0.8;
}

/* Loading state */
.loading-state {
  text-align: center;
  padding: 4rem 1rem;
  color: var(--text-muted);
}

/* 404 page */
.not-found {
  text-align: center;
  padding: 6rem 1rem;
  animation: fadeIn 200ms ease;
}

.not-found-code {
  display: block;
  font-family: var(--font-mono);
  font-size: 5rem;
  font-weight: 600;
  color: var(--accent);
  line-height: 1;
  margin-bottom: 1rem;
  opacity: 0.6;
}

.not-found h1 {
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
}

.not-found p {
  color: var(--text-muted);
  font-size: 1.1rem;
  margin-bottom: 2rem;
}

/* Responsive */
@media (max-width: 480px) {
  .container {
    padding: 1.25rem 1rem;
  }

  .paste-input {
    min-height: 200px;
  }

  .form-controls {
    flex-direction: column;
    align-items: stretch;
  }

  .btn-submit {
    text-align: center;
  }
}

/* Mode toggle */
.mode-toggle {
  display: flex;
  gap: 0;
  margin-bottom: 1rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-btn);
  overflow: hidden;
  width: fit-content;
}

.mode-tab {
  padding: 0.5rem 1.25rem;
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-family: var(--font-ui);
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  transition: background var(--transition), color var(--transition);
}

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

.mode-tab.active {
  background: var(--accent);
  color: #fff;
}

/* Drop zone */
.drop-zone {
  border: 2px dashed var(--border);
  border-radius: var(--radius-input);
  padding: 2.5rem 1.5rem;
  text-align: center;
  transition: border-color var(--transition), background var(--transition);
  cursor: pointer;
}

.drop-zone.drag-over {
  border-color: var(--accent);
  background: color-mix(in srgb, var(--accent) 5%, transparent);
}

.drop-zone.has-file {
  border-style: solid;
  padding: 1.25rem 1.5rem;
}

.drop-zone-content p {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin: 0.5rem 0;
}

.drop-icon {
  font-size: 2rem;
  display: block;
  margin-bottom: 0.5rem;
}

.drop-hint {
  font-size: 0.8rem !important;
  color: var(--text-muted);
  opacity: 0.7;
}

.btn-browse {
  display: inline-block;
  padding: 0.4rem 1rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-btn);
  color: var(--text-primary);
  font-family: var(--font-ui);
  font-size: 0.85rem;
  cursor: pointer;
  transition: border-color var(--transition);
  margin-top: 0.25rem;
}

.btn-browse:hover {
  border-color: var(--accent);
}

/* File info (in drop zone) */
.file-info {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.file-icon {
  font-size: 1.75rem;
}

.file-details {
  flex: 1;
  text-align: left;
}

.file-name {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  word-break: break-all;
}

.file-size {
  display: block;
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 0.25rem;
}

.btn-remove-file {
  background: none;
  border: 1px solid var(--border);
  border-radius: var(--radius-btn);
  padding: 0.3rem 0.6rem;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 0.9rem;
  transition: border-color var(--transition), color var(--transition);
}

.btn-remove-file:hover {
  border-color: var(--error);
  color: var(--error);
}

/* File card (view page) */
.file-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-input);
  padding: 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  animation: fadeIn 200ms ease;
}

.file-card-info {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex: 1;
  min-width: 0;
}

.file-card-icon {
  font-size: 2rem;
  flex-shrink: 0;
}

.file-card-details {
  min-width: 0;
}

.file-card-name {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.95rem;
  word-break: break-all;
}

.file-card-size {
  display: block;
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 0.25rem;
}

.btn-download {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.6rem 1.25rem;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: var(--radius-btn);
  font-family: var(--font-ui);
  font-size: 0.9rem;
  font-weight: 500;
  text-decoration: none;
  cursor: pointer;
  transition: opacity var(--transition);
  flex-shrink: 0;
}

.btn-download:hover {
  opacity: 0.9;
}