/* ─── Google Fonts ─────────────────────────────────────────────────────────── */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=JetBrains+Mono:wght@400;500&display=swap');

/* ─── Design Tokens ────────────────────────────────────────────────────────── */
:root {
  --cream: #F5F3EE;
  --cream-dark: #EAE8E1;
  --white: #FFFFFF;
  --near-black: #1A1A1A;
  --dark-card: #222220;
  --text-primary: #1A1A1A;
  --text-secondary: #6B6B65;
  --text-muted: #9E9E96;
  --yellow: #F5C518;
  --yellow-dark: #D4A800;
  --yellow-light: #FFF3B0;
  --yellow-glow: rgba(245, 197, 24, 0.25);
  --border: rgba(0,0,0,0.08);
  --border-focus: rgba(245, 197, 24, 0.6);
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.07), 0 1px 2px rgba(0,0,0,0.05);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.08), 0 2px 6px rgba(0,0,0,0.05);
  --shadow-lg: 0 12px 40px rgba(0,0,0,0.1), 0 4px 12px rgba(0,0,0,0.06);
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-pill: 999px;
  --transition: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --font-mono: 'JetBrains Mono', monospace;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: 'Inter', sans-serif;
  background-color: var(--cream);
  color: var(--text-primary);
  min-height: 100vh;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

/* ─── Scrollbar ─────────────────────────────────────────────────────────────── */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--cream-dark); border-radius: 99px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-muted); }

/* ─── Layout ────────────────────────────────────────────────────────────────── */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 28px;
}

/* ─── Navbar ─────────────────────────────────────────────────────────────────- */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  background: rgba(245, 243, 238, 0.85);
  border-bottom: 1px solid var(--border);
}

.navbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
  gap: 16px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
  font-size: 1rem;
  letter-spacing: -0.02em;
  color: var(--near-black);
  text-decoration: none;
}

.logo-icon {
  width: 28px;
  height: 28px;
  background: var(--near-black);
  border-radius: 7px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
  list-style: none;
}

.nav-links a {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-secondary);
  text-decoration: none;
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  transition: all var(--transition);
}

.nav-links a:hover {
  color: var(--text-primary);
  background: var(--cream-dark);
}

.nav-links a.nav-extension-btn {
  background: var(--near-black);
  color: var(--white);
  padding: 6px 14px;
}

.nav-links a.nav-extension-btn:hover {
  background: #333;
  color: var(--white);
}

/* ─── Hero Section ─────────────────────────────────────────────────────────── */
.hero {
  padding: 64px 0 40px;
  text-align: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--yellow-light);
  color: var(--yellow-dark);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 5px 12px;
  border-radius: var(--radius-pill);
  border: 1px solid rgba(212,168,0,0.2);
  margin-bottom: 20px;
}

.hero h1 {
  font-size: clamp(2rem, 5vw, 3.2rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.15;
  color: var(--near-black);
  margin-bottom: 14px;
}

.hero h1 span {
  color: var(--yellow-dark);
}

.hero-sub {
  font-size: 1rem;
  color: var(--text-secondary);
  max-width: 480px;
  margin: 0 auto;
  font-weight: 400;
}

/* ─── Main Grid ─────────────────────────────────────────────────────────────── */
.app-grid {
  display: grid;
  grid-template-columns: 340px 1fr;
  gap: 20px;
  padding-bottom: 80px;
  align-items: start;
}

/* ─── Card Base ─────────────────────────────────────────────────────────────── */
.card {
  background: var(--white);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border);
}

.card-label {
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 14px;
}

/* ─── Key Panel ─────────────────────────────────────────────────────────────── */
.key-panel { display: flex; flex-direction: column; gap: 16px; }

.key-input-wrapper {
  position: relative;
}

.key-input {
  width: 100%;
  padding: 13px 44px 13px 14px;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--near-black);
  background: var(--cream);
  border: 1.5px solid var(--border);
  border-radius: var(--radius-md);
  outline: none;
  transition: all var(--transition);
  letter-spacing: 0.02em;
}

.key-input:focus {
  border-color: var(--yellow);
  background: var(--white);
  box-shadow: 0 0 0 3px var(--yellow-glow);
}

.key-input::placeholder {
  color: var(--text-muted);
  font-weight: 400;
  letter-spacing: 0;
}

.key-toggle-visibility {
  position: absolute;
  right: 12px;
  top: 50%;
  transform: translateY(-50%);
  background: none;
  border: none;
  cursor: pointer;
  color: var(--text-muted);
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  transition: all var(--transition);
  flex-shrink: 0;
}

.key-toggle-visibility:hover { color: var(--text-primary); background: var(--cream); }

/* Fingerprint display */
.fingerprint-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

.fingerprint-display {
  display: flex;
  align-items: center;
  gap: 8px;
  flex: 1;
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--text-muted);
  flex-shrink: 0;
  transition: all 0.3s ease;
}

.status-dot.active {
  background: #22c55e;
  box-shadow: 0 0 0 3px rgba(34,197,94,0.2);
  animation: pulse-green 2s infinite;
}

@keyframes pulse-green {
  0%, 100% { box-shadow: 0 0 0 3px rgba(34,197,94,0.2); }
  50% { box-shadow: 0 0 0 5px rgba(34,197,94,0.1); }
}

.fingerprint-text {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-secondary);
  letter-spacing: 0.08em;
}

.fingerprint-text.has-value { color: var(--near-black); }

/* Generate random key button */
.btn-generate {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-secondary);
  background: var(--cream);
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 7px 12px;
  cursor: pointer;
  transition: all var(--transition);
  white-space: nowrap;
}

.btn-generate:hover {
  background: var(--yellow-light);
  border-color: var(--yellow);
  color: var(--yellow-dark);
}

/* Saved Keys */
.saved-keys-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 10px;
}

.saved-keys-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
  max-height: 200px;
  overflow-y: auto;
}

.saved-key-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 9px 12px;
  background: var(--cream);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition);
  border: 1.5px solid transparent;
  gap: 8px;
}

.saved-key-item:hover {
  border-color: var(--yellow);
  background: var(--yellow-light);
}

.saved-key-item.active-key {
  border-color: var(--yellow);
  background: var(--yellow-light);
}

.saved-key-name {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-primary);
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.saved-key-fp {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-muted);
}

.btn-delete-key {
  background: none;
  border: none;
  cursor: pointer;
  color: var(--text-muted);
  width: 20px;
  height: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 4px;
  transition: all var(--transition);
  flex-shrink: 0;
}

.btn-delete-key:hover { color: #ef4444; background: rgba(239,68,68,0.08); }

.empty-keys {
  font-size: 0.82rem;
  color: var(--text-muted);
  text-align: center;
  padding: 20px 0;
}

/* Save key input */
.save-key-row {
  display: flex;
  gap: 8px;
  margin-top: 10px;
}

.save-key-input {
  flex: 1;
  padding: 8px 12px;
  font-family: 'Inter', sans-serif;
  font-size: 0.82rem;
  color: var(--text-primary);
  background: var(--cream);
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  outline: none;
  transition: all var(--transition);
}

.save-key-input:focus {
  border-color: var(--yellow);
  box-shadow: 0 0 0 3px var(--yellow-glow);
  background: var(--white);
}

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

.btn-save-key {
  padding: 8px 14px;
  font-size: 0.8rem;
  font-weight: 600;
  background: var(--near-black);
  color: var(--white);
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition);
  white-space: nowrap;
}

.btn-save-key:hover { background: #333; transform: translateY(-1px); }
.btn-save-key:active { transform: translateY(0); }

/* ─── Workspace Panel ───────────────────────────────────────────────────────── */
.workspace-panel { display: flex; flex-direction: column; gap: 16px; }

/* Mode toggle */
.mode-toggle {
  display: inline-flex;
  background: var(--cream);
  border-radius: var(--radius-pill);
  padding: 3px;
  border: 1px solid var(--border);
  align-self: flex-start;
}

.mode-btn {
  font-size: 0.82rem;
  font-weight: 600;
  padding: 7px 20px;
  border: none;
  border-radius: var(--radius-pill);
  cursor: pointer;
  transition: all var(--transition);
  background: transparent;
  color: var(--text-secondary);
}

.mode-btn.active {
  background: var(--near-black);
  color: var(--white);
  box-shadow: var(--shadow-sm);
}

/* Text areas row */
.text-panels {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 12px;
  align-items: start;
}

.text-panel { display: flex; flex-direction: column; gap: 8px; }

.panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.panel-label {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.panel-actions { display: flex; gap: 4px; }

.btn-icon {
  background: none;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  color: var(--text-muted);
  width: 30px;
  height: 30px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition);
  font-size: 13px;
}

.btn-icon:hover {
  color: var(--text-primary);
  background: var(--cream);
  border-color: rgba(0,0,0,0.15);
}

.text-area {
  width: 100%;
  min-height: 220px;
  padding: 14px;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  line-height: 1.6;
  color: var(--near-black);
  background: var(--cream);
  border: 1.5px solid var(--border);
  border-radius: var(--radius-md);
  resize: vertical;
  outline: none;
  transition: all var(--transition);
  letter-spacing: 0.01em;
}

.text-area:focus {
  border-color: var(--yellow);
  background: var(--white);
  box-shadow: 0 0 0 3px var(--yellow-glow);
}

.text-area::placeholder { color: var(--text-muted); font-family: 'Inter', sans-serif; letter-spacing: 0; }
.text-area:read-only { background: var(--cream); cursor: default; color: var(--text-secondary); }
.text-area:read-only:focus { border-color: var(--border); box-shadow: none; }

.char-count {
  font-size: 0.7rem;
  color: var(--text-muted);
  text-align: right;
}

/* Swap button in center */
.swap-col {
  display: flex;
  align-items: center;
  padding-top: 40px;
}

.btn-swap {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--white);
  border: 1.5px solid var(--border);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  transition: all var(--transition);
  box-shadow: var(--shadow-sm);
}

.btn-swap:hover {
  background: var(--yellow-light);
  border-color: var(--yellow);
  color: var(--yellow-dark);
  transform: rotate(180deg);
}

/* Main action button */
.btn-run {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  width: 100%;
  padding: 14px 24px;
  font-family: 'Inter', sans-serif;
  font-size: 0.92rem;
  font-weight: 700;
  letter-spacing: 0.01em;
  background: var(--near-black);
  color: var(--white);
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}

.btn-run::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(245,197,24,0.15) 0%, transparent 60%);
  opacity: 0;
  transition: opacity var(--transition);
}

.btn-run:hover::before { opacity: 1; }
.btn-run:hover { background: #2a2a2a; transform: translateY(-1px); box-shadow: 0 6px 20px rgba(0,0,0,0.2); }
.btn-run:active { transform: translateY(0); box-shadow: none; }
.btn-run:disabled { opacity: 0.5; cursor: not-allowed; transform: none; }

.btn-run-hint {
  font-size: 0.72rem;
  color: var(--text-muted);
  text-align: center;
  margin-top: -8px;
}

/* ─── Rule Inspector ────────────────────────────────────────────────────────── */
.rule-inspector {
  background: var(--dark-card);
  border-radius: var(--radius-lg);
  padding: 20px;
  border: 1px solid rgba(255,255,255,0.06);
}

.rule-inspector-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
  cursor: pointer;
}

.rule-inspector-title {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.4);
}

.rule-inspector-chevron {
  color: rgba(255,255,255,0.3);
  transition: transform var(--transition);
  font-size: 12px;
}

.rule-inspector.collapsed .rule-inspector-chevron { transform: rotate(-90deg); }
.rule-inspector.collapsed .rule-inspector-grid { display: none; }

.rule-inspector-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
}

.rule-item {
  background: rgba(255,255,255,0.04);
  border-radius: var(--radius-sm);
  padding: 10px 12px;
  border: 1px solid rgba(255,255,255,0.06);
}

.rule-item-label {
  font-size: 0.65rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.3);
  margin-bottom: 4px;
}

.rule-item-value {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--yellow);
}

.rule-item-value.empty { color: rgba(255,255,255,0.15); }

/* ─── Toast Notifications ─────────────────────────────────────────────────── */
.toast-container {
  position: fixed;
  bottom: 28px;
  right: 28px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  z-index: 1000;
  pointer-events: none;
}

.toast {
  display: flex;
  align-items: center;
  gap: 10px;
  background: var(--near-black);
  color: var(--white);
  padding: 12px 18px;
  border-radius: var(--radius-md);
  font-size: 0.85rem;
  font-weight: 500;
  box-shadow: var(--shadow-lg);
  pointer-events: all;
  animation: toast-in 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
  border: 1px solid rgba(255,255,255,0.08);
  max-width: 300px;
}

.toast.toast-success .toast-icon { color: #22c55e; }
.toast.toast-error .toast-icon { color: #ef4444; }
.toast.toast-info .toast-icon { color: var(--yellow); }

.toast.hiding { animation: toast-out 0.2s ease forwards; }

@keyframes toast-in {
  from { opacity: 0; transform: translateY(12px) scale(0.95); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}

@keyframes toast-out {
  from { opacity: 1; transform: translateY(0) scale(1); }
  to { opacity: 0; transform: translateY(6px) scale(0.95); }
}

/* ─── Footer ─────────────────────────────────────────────────────────────────- */
.footer {
  border-top: 1px solid var(--border);
  padding: 24px 0;
  text-align: center;
}

.footer-text {
  font-size: 0.8rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
}

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

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

/* ─── Responsive ─────────────────────────────────────────────────────────────- */
@media (max-width: 900px) {
  .app-grid {
    grid-template-columns: 1fr;
  }

  .text-panels {
    grid-template-columns: 1fr;
    grid-template-rows: auto auto auto;
  }

  .swap-col {
    padding-top: 0;
    justify-content: center;
    order: 99;
  }

  .btn-swap {
    transform: rotate(90deg);
  }

  .btn-swap:hover {
    transform: rotate(270deg);
  }
}

@media (max-width: 600px) {
  .container { padding: 0 16px; }
  .hero { padding: 40px 0 28px; }
  .rule-inspector-grid { grid-template-columns: repeat(2, 1fr); }
  .nav-links { display: none; }
}

/* ─── Loading State ──────────────────────────────────────────────────────────-*/
.spinning {
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}