* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
body {
  font-family: 'Inter', sans-serif;
  background: #0b0d15;
  color: #e4e6eb;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.3s, color 0.3s;
}
.hidden { display: none !important; }

:root {
  --primary: #6c5ce7;
  --primary-light: #a29bfe;
  --primary-dark: #4834d4;
  --bg: #0b0d15;
  --card: rgba(255, 255, 255, 0.05);
  --glass: rgba(255, 255, 255, 0.08);
  --border: rgba(255, 255, 255, 0.12);
  --text: #e4e6eb;
  --text-secondary: #b0b3c0;
  --shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.8);
  --radius: 24px;
}

/* LOGIN */
#loginPage {
  width: 100%;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: radial-gradient(circle at 20% 30%, #1a1a2e, #0b0d15);
  padding: 1.5rem;
}
.login-card {
  max-width: 440px;
  width: 100%;
  padding: 2.5rem 2rem;
  background: var(--glass);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  text-align: center;
  animation: fadeUp 0.6s ease;
}
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}
.login-card .logo {
  font-size: 2.8rem;
  font-weight: 800;
  letter-spacing: -0.5px;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: 0.25rem;
}
.login-card .sub {
  color: var(--text-secondary);
  font-size: 0.95rem;
  margin-bottom: 2rem;
}
.login-card .greeting {
  font-size: 1.1rem;
  font-weight: 500;
  margin-bottom: 1.5rem;
}
.login-card .greeting i {
  color: var(--primary);
  margin-right: 0.5rem;
}
.key-input-group {
  display: flex;
  gap: 0.75rem;
  align-items: center;
  background: rgba(255, 255, 255, 0.06);
  border-radius: 60px;
  padding: 0.3rem 0.3rem 0.3rem 1.5rem;
  border: 1px solid var(--border);
  transition: border 0.3s, box-shadow 0.3s;
}
.key-input-group:focus-within {
  border-color: var(--primary);
  box-shadow: 0 0 0 4px rgba(108, 92, 231, 0.2);
}
.key-input-group input {
  flex: 1;
  background: transparent;
  border: none;
  outline: none;
  color: var(--text);
  font-size: 1rem;
  padding: 0.8rem 0;
}
.key-input-group input::placeholder {
  color: var(--text-secondary);
}
.key-input-group button {
  background: var(--primary);
  border: none;
  color: #fff;
  font-weight: 600;
  padding: 0.8rem 1.8rem;
  border-radius: 60px;
  cursor: pointer;
  transition: background 0.2s, transform 0.1s;
  font-size: 0.95rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.key-input-group button:hover {
  background: var(--primary-dark);
}
.key-input-group button:active {
  transform: scale(0.96);
}
.key-msg {
  margin-top: 1rem;
  font-size: 0.9rem;
  min-height: 1.8rem;
  font-weight: 500;
}
.key-msg.valid { color: #4ecdc4; }
.key-msg.invalid { color: #ff6b6b; }

/* MAIN */
#mainPage {
  width: 100%;
  min-height: 100vh;
  background: var(--bg);
  padding: 1.5rem;
}

.header {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.8rem 1.5rem;
  background: var(--glass);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-radius: 60px;
  border: 1px solid var(--border);
  margin-bottom: 2rem;
}
.header .brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 1.5rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}
.header .brand i {
  font-size: 1.8rem;
  -webkit-text-fill-color: var(--primary);
}
.header-controls {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}
.header-controls select,
.header-controls input[type="color"] {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--border);
  border-radius: 40px;
  padding: 0.5rem 1rem;
  color: var(--text);
  font-size: 0.85rem;
  cursor: pointer;
  outline: none;
  transition: border 0.2s;
}
.header-controls select:hover,
.header-controls input[type="color"]:hover {
  border-color: var(--primary);
}
.header-controls select option {
  background: #1a1a2e;
}
.color-presets {
  display: flex;
  gap: 0.4rem;
  align-items: center;
}
.color-presets .dot {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  border: 2px solid transparent;
  cursor: pointer;
  transition: 0.2s;
}
.color-presets .dot:hover {
  transform: scale(1.15);
  border-color: #fff;
}
.color-presets .dot.active {
  border-color: #fff;
  box-shadow: 0 0 12px rgba(255, 255, 255, 0.3);
}
#logoutBtn {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--border);
  border-radius: 40px;
  padding: 0.4rem 1.2rem;
  color: var(--text);
  cursor: pointer;
  transition: 0.2s;
}
#logoutBtn:hover {
  background: rgba(255, 255, 255, 0.12);
}

.main-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  flex: 1;
}
@media (max-width: 1024px) {
  .main-grid {
    grid-template-columns: 1fr;
  }
}

.panel {
  background: var(--glass);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.8rem;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}
.panel-title {
  font-size: 1.1rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 0.6rem;
}
.panel-title i {
  color: var(--primary);
}

.upload-zone {
  border: 2px dashed var(--border);
  border-radius: 18px;
  padding: 2.5rem 1.5rem;
  text-align: center;
  transition: 0.3s;
  cursor: pointer;
  background: rgba(255, 255, 255, 0.02);
}
.upload-zone.dragover {
  border-color: var(--primary);
  background: rgba(108, 92, 231, 0.08);
}
.upload-zone i {
  font-size: 2.8rem;
  color: var(--text-secondary);
  margin-bottom: 0.5rem;
}
.upload-zone p {
  font-weight: 500;
}
.upload-zone span {
  font-size: 0.85rem;
  color: var(--text-secondary);
}
.file-info {
  display: none;
  align-items: center;
  gap: 0.8rem;
  margin-top: 0.8rem;
  padding: 0.6rem 1rem;
  background: rgba(255, 255, 255, 0.05);
  border-radius: 40px;
}
.file-info.visible {
  display: flex;
}
.file-info i {
  color: var(--primary);
}

.options-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}
.options-grid label {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-secondary);
}
.options-grid select,
.options-grid input[type="text"] {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 0.6rem 0.8rem;
  color: var(--text);
  font-size: 0.9rem;
  outline: none;
  transition: border 0.2s;
}
.options-grid select:focus,
.options-grid input[type="text"]:focus {
  border-color: var(--primary);
}

.btn-start {
  background: var(--primary);
  border: none;
  color: #fff;
  font-weight: 700;
  font-size: 1.1rem;
  padding: 1rem;
  border-radius: 60px;
  cursor: pointer;
  transition: 0.2s;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
}
.btn-start:hover {
  background: var(--primary-dark);
  transform: scale(1.01);
}
.btn-start:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

.terminal {
  background: #0a0c14;
  border-radius: var(--radius);
  padding: 1rem 1.2rem;
  display: flex;
  flex-direction: column;
  border: 1px solid var(--border);
  min-height: 300px;
  height: 100%;
}
.terminal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.8rem;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-secondary);
}
.terminal-header i {
  color: var(--primary);
}
.terminal-body {
  flex: 1;
  overflow-y: auto;
  font-family: 'JetBrains Mono', 'Fira Code', monospace;
  font-size: 0.85rem;
  line-height: 1.6;
  white-space: pre-wrap;
  word-break: break-all;
  padding-right: 0.3rem;
}
.terminal-body .log-line {
  display: flex;
  gap: 0.6rem;
}
.terminal-body .log-time {
  color: var(--text-secondary);
  opacity: 0.6;
}
.terminal-body .log-ok { color: #4ecdc4; }
.terminal-body .log-info { color: #74b9ff; }
.terminal-body .log-warn { color: #fdcb6e; }
.terminal-body .log-error { color: #ff6b6b; }
.terminal-body .log-result { color: #a29bfe; font-weight: 600; }

.result-area {
  margin-top: 1rem;
  display: none;
  flex-direction: column;
  gap: 0.8rem;
}
.result-area.visible {
  display: flex;
}
.result-area textarea {
  background: #0a0c14;
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 1rem;
  color: var(--text);
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.85rem;
  resize: vertical;
  min-height: 200px;
  outline: none;
}
.result-actions {
  display: flex;
  gap: 0.8rem;
  flex-wrap: wrap;
}
.result-actions button {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--border);
  border-radius: 40px;
  padding: 0.5rem 1.2rem;
  color: var(--text);
  cursor: pointer;
  transition: 0.2s;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
}
.result-actions button:hover {
  background: rgba(255, 255, 255, 0.12);
  border-color: var(--primary);
}
#clearTerminal {
  background: none;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
}

::-webkit-scrollbar { width: 4px; height: 4px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--primary); border-radius: 10px; }

@media (max-width: 640px) {
  .header { flex-direction: column; align-items: stretch; gap: 0.8rem; }
  .header-controls { justify-content: center; }
  .options-grid { grid-template-columns: 1fr; }
  .login-card { padding: 2rem 1.2rem; }
}