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

:root {
  --bg: #0d1117;
  --surface: #161b22;
  --surface2: #21262d;
  --border: #30363d;
  --text: #e6edf3;
  --muted: #7d8590;
  --accent: #7c3aed;
  --accent-hover: #6d28d9;
  --accent-light: rgba(124, 58, 237, 0.15);
  --danger: #f85149;
  --danger-bg: rgba(248, 81, 73, 0.1);
  --success: #3fb950;
  --radius: 10px;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  font-size: 15px;
  line-height: 1.6;
  min-height: 100vh;
}

/* ---- LAYOUT ---- */
.app { display: flex; flex-direction: column; min-height: 100vh; }

header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: 0 28px;
  height: 58px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: 100;
}

.logo {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 8px;
  letter-spacing: -0.3px;
}

.logo-icon { font-size: 1.2rem; }

.nav-btn {
  background: var(--accent);
  color: #fff;
  text-decoration: none;
  padding: 7px 16px;
  border-radius: 8px;
  font-size: 0.85rem;
  font-weight: 600;
  transition: background 0.2s;
}
.nav-btn:hover { background: var(--accent-hover); }

main { flex: 1; padding: 28px 16px; }

footer {
  background: var(--surface);
  border-top: 1px solid var(--border);
  padding: 14px 28px;
  text-align: center;
  color: var(--muted);
  font-size: 0.78rem;
}

/* ---- CONTAINER & CARD ---- */
.container { max-width: 980px; margin: 0 auto; }

.hero {
  text-align: center;
  padding: 20px 0 28px;
}
.hero h1 {
  font-size: 2rem;
  font-weight: 700;
  background: linear-gradient(135deg, #e6edf3, #7c3aed);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 8px;
}
.hero p { color: var(--muted); font-size: 1rem; }

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
}

.center-card {
  max-width: 420px;
  margin: 60px auto;
  text-align: center;
}
.center-card h2 { font-size: 1.3rem; margin-bottom: 6px; }
.lock-icon { font-size: 3rem; margin-bottom: 12px; }
.spinner {
  width: 36px; height: 36px;
  border: 3px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  margin: 0 auto 16px;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ---- FORMS ---- */
.form-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: 16px;
}

.form-group label {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.form-group input,
.form-group select,
.form-group textarea {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  padding: 9px 13px;
  font-size: 0.9rem;
  font-family: inherit;
  transition: border-color 0.2s, box-shadow 0.2s;
  outline: none;
  width: 100%;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-light);
}

.form-group textarea {
  font-family: 'Cascadia Code', 'Fira Code', 'Consolas', monospace;
  font-size: 0.85rem;
  resize: vertical;
  line-height: 1.65;
  min-height: 320px;
}

.form-row {
  display: flex;
  gap: 14px;
  align-items: flex-start;
  flex-wrap: wrap;
}
.form-row .form-group { flex: 1; min-width: 140px; }

.form-footer {
  margin-top: 4px;
  align-items: flex-end;
}
.submit-area {
  display: flex;
  align-items: flex-end;
  padding-bottom: 16px;
}

/* ---- BUTTONS ---- */
.btn-primary {
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 8px;
  padding: 10px 22px;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s, transform 0.1s;
  white-space: nowrap;
}
.btn-primary:hover { background: var(--accent-hover); }
.btn-primary:active { transform: scale(0.98); }
.btn-primary:disabled { opacity: 0.55; cursor: not-allowed; }

.btn-secondary {
  background: var(--surface2);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 8px 16px;
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  transition: background 0.2s;
  white-space: nowrap;
}
.btn-secondary:hover { background: var(--border); }

/* ---- ALERTS ---- */
.alert {
  border-radius: 8px;
  padding: 10px 14px;
  font-size: 0.85rem;
  margin-bottom: 16px;
}
.alert-error {
  background: var(--danger-bg);
  border: 1px solid rgba(248, 81, 73, 0.35);
  color: var(--danger);
}

/* ---- PASTE VIEW ---- */
.paste-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 16px;
  margin-bottom: 12px;
  flex-wrap: wrap;
}

.paste-title {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.paste-meta {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  font-size: 0.78rem;
  color: var(--muted);
  align-items: center;
}

.lang-badge {
  background: var(--accent-light);
  color: #a78bfa;
  border: 1px solid rgba(124, 58, 237, 0.3);
  border-radius: 5px;
  padding: 1px 8px;
  font-family: monospace;
  font-size: 0.75rem;
}

.paste-actions {
  display: flex;
  gap: 8px;
  flex-shrink: 0;
  flex-wrap: wrap;
}

.code-toolbar {
  padding: 6px 0 10px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 0;
}

.code-wrapper {
  border-radius: 8px;
  overflow: hidden;
  border: 1px solid var(--border);
  margin-top: 12px;
}

.code-wrapper pre { margin: 0; overflow-x: auto; }

.code-wrapper code {
  font-family: 'Cascadia Code', 'Fira Code', 'Consolas', monospace !important;
  font-size: 0.84rem !important;
}

.hljs { background: #0d1117 !important; padding: 20px !important; }

.muted { color: var(--muted); }

/* ---- RESPONSIVE ---- */
@media (max-width: 640px) {
  .form-row { flex-direction: column; }
  .paste-header { flex-direction: column; }
  .paste-actions { width: 100%; justify-content: flex-start; }
  .hero h1 { font-size: 1.5rem; }
}