@import url("https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap");

:root {
  --bg-primary: #121212;
  --bg-secondary: #1e1e1e;
  --bg-tertiary: #282828;
  --bg-card: #181818;
  --bg-hover: #2a2a2a;

  --accent-green: #1db954;
  --accent-green-hover: #1ed760;
  --accent-purple: #8b5cf6;
  --accent-blue: #3b82f6;
  --accent-pink: #ec4899;

  --text-primary: #ffffff;
  --text-secondary: #b3b3b3;
  --text-muted: #6b7280;

  --border-color: #404040;
  --border-hover: #535353;

  --success: #22c55e;
  --warning: #f59e0b;
  --error: #ef4444;

  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);

  --gradient-main: linear-gradient(
    135deg,
    #1db954 0%,
    #1ed760 50%,
    #8b5cf6 100%
  );
  --gradient-card: linear-gradient(145deg, #181818 0%, #1e1e1e 100%);
  --gradient-accent: linear-gradient(45deg, #8b5cf6, #ec4899, #3b82f6);
}

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

body {
  font-family: "Inter", -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
}

::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-track {
  background: var(--bg-secondary);
}

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

::-webkit-scrollbar-thumb:hover {
  background: var(--border-hover);
}

.app-container {
  min-height: 100vh;
  display: grid;
  grid-template-areas:
    "header header header"
    "main main aside";
  grid-template-columns: 1fr 1fr 300px;
  grid-template-rows: auto 1fr;
  gap: 20px;
  padding: 20px;
  max-width: 1400px;
  margin: 0 auto;
}

.app-header {
  grid-area: header;
  background: var(--gradient-card);
  border-radius: 12px;
  padding: 24px 32px;
  border: 1px solid var(--border-color);
  position: relative;
  overflow: hidden;
}

.app-header::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gradient-main);
}

.header-content {
  text-align: center;
}

.logo {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  margin-bottom: 8px;
}

.logo i {
  font-size: 2rem;
  background: var(--gradient-main);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.logo h1 {
  font-size: 2.5rem;
  font-weight: 700;
  background: var(--gradient-main);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.subtitle {
  color: var(--text-secondary);
  font-size: 1.1rem;
  font-weight: 400;
}

.main-content {
  grid-area: main;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.cipher-workspace {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

section {
  background: var(--gradient-card);
  border-radius: 12px;
  padding: 24px;
  border: 1px solid var(--border-color);
  transition: all 0.3s ease;
}

section:hover {
  border-color: var(--border-hover);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.section-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 20px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border-color);
}

.section-header i {
  font-size: 1.2rem;
  color: var(--accent-green);
}

.section-header h2 {
  font-size: 1.3rem;
  font-weight: 600;
  color: var(--text-primary);
}

/* Input Section */
.input-container {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.input-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.input-group label {
  font-weight: 500;
  color: var(--text-secondary);
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

#text-input {
  background: var(--bg-tertiary);
  border: 2px solid var(--border-color);
  border-radius: 8px;
  padding: 16px;
  color: var(--text-primary);
  font-family: "Inter", monospace;
  font-size: 1rem;
  min-height: 100px;
  resize: vertical;
  transition: all 0.3s ease;
}

#text-input:focus {
  outline: none;
  border-color: var(--accent-green);
  box-shadow: 0 0 0 3px rgba(29, 185, 84, 0.1);
}

#text-input.error {
  border-color: var(--error);
  background: rgba(239, 68, 68, 0.1);
  color: var(--error);
}

#text-input.error:focus {
  border-color: var(--error);
  box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.2);
}

.input-info {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.85rem;
}

.char-count {
  color: var(--text-muted);
}

.status-indicator {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  border-radius: 4px;
  background: rgba(34, 197, 94, 0.1);
  border: 1px solid rgba(34, 197, 94, 0.3);
  color: var(--success);
  font-weight: 500;
  font-size: 0.8rem;
  backdrop-filter: blur(4px);
  transition: all 0.3s ease;
  user-select: none;
  cursor: default;
}

.status-indicator i {
  font-size: 0.75rem;
  opacity: 0.9;
}

.matrix-container {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.matrix-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  max-width: 240px;
  margin: 0 auto;
}

.matrix-cell {
  width: 70px;
  height: 70px;
  background: var(--bg-tertiary);
  border: 2px solid var(--border-color);
  border-radius: 8px;
  color: var(--text-primary);
  font-size: 1.1rem;
  font-weight: 600;
  text-align: center;
  transition: all 0.3s ease;
  appearance: textfield;
  -moz-appearance: textfield;
}

.matrix-cell::-webkit-outer-spin-button,
.matrix-cell::-webkit-inner-spin-button {
  -webkit-appearance: none;
  margin: 0;
}

.matrix-cell:focus {
  outline: none;
  border-color: var(--accent-green);
  box-shadow: 0 0 0 3px rgba(29, 185, 84, 0.1);
  transform: scale(1.05);
}

.matrix-cell:hover {
  border-color: var(--border-hover);
}

.matrix-cell.error {
  border-color: var(--error);
  background: rgba(239, 68, 68, 0.1);
  color: var(--error);
}

.matrix-cell.error:focus {
  border-color: var(--error);
  box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.2);
}

.matrix-cell.warning {
  border-color: var(--warning);
  background: rgba(245, 158, 11, 0.1);
  color: var(--warning);
}

.matrix-cell.warning:focus {
  border-color: var(--warning);
  box-shadow: 0 0 0 3px rgba(245, 158, 11, 0.2);
}

.matrix-info {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 16px;
  background: var(--bg-tertiary);
  border-radius: 8px;
  border: 1px solid var(--border-color);
}

.matrix-status {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--success);
  font-weight: 500;
  font-size: 0.9rem;
}

.matrix-details {
  display: flex;
  gap: 16px;
  font-size: 0.85rem;
  color: var(--text-secondary);
  font-family: "Courier New", monospace;
}

.operation-controls {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 20px;
  position: relative;
}

.operation-buttons {
  display: flex;
  gap: 16px;
  justify-content: center;
}

.operation-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 14px 24px;
  border: none;
  border-radius: 8px;
  font-family: inherit;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.encrypt-btn {
  background: var(--gradient-main);
  color: white;
}

.encrypt-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(29, 185, 84, 0.3);
}

.decrypt-btn {
  background: linear-gradient(135deg, var(--accent-purple), var(--accent-pink));
  color: white;
}

.decrypt-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(139, 92, 246, 0.3);
}

.reset-btn {
  position: absolute;
  right: 0;
  padding: 10px 16px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  color: var(--text-secondary);
  font-size: 0.9rem;
  cursor: pointer;
  transition: all 0.3s ease;
  display: flex;
  align-items: center;
  gap: 8px;
}

.reset-btn:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
  border-color: var(--border-hover);
}

.results-container {
  min-height: 200px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.results-placeholder {
  text-align: center;
  color: var(--text-muted);
}

.results-placeholder i {
  font-size: 3rem;
  margin-bottom: 12px;
  opacity: 0.5;
}

.results-content {
  display: none;
}

.results-content.active {
  display: block;
  animation: fadeInUp 0.5s ease;
}

.result-header {
  margin-bottom: 20px;
  padding-bottom: 16px;
  border-bottom: 2px solid var(--border-color);
  text-align: center;
}

.result-header h3 {
  margin-bottom: 8px;
  font-size: 1.4rem;
  color: var(--text-primary);
}

.math-formula {
  font-family: "Times New Roman", serif;
  font-size: 1.1rem;
  color: var(--accent-green);
  font-style: italic;
  font-weight: 500;
}

.math-formula.decrypt {
  color: var(--accent-purple);
}

.result-item {
  margin-bottom: 16px;
  padding: 12px 16px;
  background: var(--bg-tertiary);
  border-radius: 8px;
  border-left: 4px solid var(--accent-green);
  font-family: "Courier New", monospace;
  font-size: 0.9rem;
  line-height: 1.5;
}

.result-item.decrypt {
  border-left: 4px solid var(--accent-purple);
}

.step-title {
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.step-number {
  font-weight: 600;
  color: var(--accent-blue);
  margin-bottom: 4px;
  font-size: 0.85rem;
}

.calculation {
  font-family: "Times New Roman", serif;
  font-size: 1rem;
  color: var(--text-primary);
  font-weight: 500;
}

.matrix-display {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  margin: 16px 0;
  font-family: "Times New Roman", serif;
  padding: 12px;
  background: rgba(29, 185, 84, 0.05);
  border-radius: 8px;
  border: 1px solid rgba(29, 185, 84, 0.2);
}

.matrix-display.decrypt {
  background: rgba(139, 92, 246, 0.05);
  border: 1px solid rgba(139, 92, 246, 0.2);
}

.matrix-bracket {
  font-size: 4rem;
  color: var(--accent-green);
  line-height: 0.7;
  font-weight: bold;
  display: flex;
  align-items: center;
  height: 100%;
  font-family: "Consolas", "Monaco", "Courier New", monospace;
  min-width: 24px;
  text-shadow: 0 0 10px rgba(29, 185, 84, 0.3);
}

.matrix-display.decrypt .matrix-bracket {
  color: var(--accent-purple);
  text-shadow: 0 0 10px rgba(139, 92, 246, 0.3);
}

.matrix-content {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  min-height: 80px;
  padding: 8px 4px;
}

.matrix-row {
  display: flex;
  gap: 12px;
  justify-content: center;
  align-items: center;
  margin: 2px 0;
}

.matrix-element {
  display: inline-block;
  width: 32px;
  text-align: center;
  font-size: 1.1rem;
  color: var(--text-primary);
  font-weight: 600;
  line-height: 1.2;
}

.result-final {
  background: var(--gradient-main);
  color: white;
  font-weight: 600;
  text-align: center;
  padding: 16px;
  border-radius: 8px;
  margin-top: 16px;
  margin-bottom: 24px;
  min-height: 80px;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.result-final.decrypt {
  background: linear-gradient(135deg, var(--accent-purple), var(--accent-pink));
}

.info-panel {
  grid-area: aside;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.info-content {
  background: var(--gradient-card);
  border-radius: 12px;
  border: 1px solid var(--border-color);
  overflow: hidden;
}

.info-header {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px 24px;
  background: var(--bg-hover);
  border-bottom: 1px solid var(--border-color);
}

.info-header i {
  color: var(--accent-blue);
  font-size: 1.2rem;
}

.info-header h3 {
  font-size: 1.2rem;
  font-weight: 600;
}

.info-card {
  padding: 20px;
}

.info-card h4 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 12px;
  color: var(--text-primary);
}

.alphabet-table {
  margin-bottom: 16px;
  border-radius: 8px;
  overflow: hidden;
  border: 1px solid var(--border-color);
  background: var(--bg-tertiary);
}

.alphabet-header {
  display: grid;
  grid-template-columns: 1fr 1fr;
  background: var(--bg-hover);
  padding: 8px 12px;
  font-weight: 600;
  font-size: 0.85rem;
  color: var(--text-primary);
  border-bottom: 1px solid var(--border-color);
  text-align: center;
}

.alphabet-body {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--border-color);
  padding: 1px;
}

.alphabet-column {
  background: var(--bg-tertiary);
  display: flex;
  flex-direction: column;
}

.alphabet-pair {
  display: grid;
  grid-template-columns: 1fr 1fr;
  padding: 4px 8px;
  font-family: "Courier New", monospace;
  font-size: 0.8rem;
  border-bottom: 1px solid var(--border-color);
  transition: all 0.2s ease;
}

.alphabet-pair:last-child {
  border-bottom: none;
}

.alphabet-pair:hover {
  background: var(--bg-hover);
}

.alphabet-pair span:first-child {
  font-weight: 600;
  color: var(--text-primary);
  text-align: center;
}

.alphabet-pair span:last-child {
  color: var(--accent-green);
  text-align: center;
  font-weight: 500;
}

.info-card ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.info-card li {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.info-card li i {
  color: var(--success);
  font-size: 0.8rem;
}

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

@keyframes pulse {
  0%,
  100% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.05);
  }
}

.pulse {
  animation: pulse 2s infinite;
}

@media (max-width: 1200px) {
  .app-container {
    grid-template-areas:
      "header"
      "main"
      "aside";
    grid-template-columns: 1fr;
    grid-template-rows: auto 1fr auto;
  }
}

@media (max-width: 768px) {
  .app-container {
    padding: 12px;
    gap: 16px;
  }

  .app-header {
    padding: 20px;
  }

  .logo h1 {
    font-size: 2rem;
  }

  section {
    padding: 16px;
  }

  .operation-controls {
    flex-direction: column;
    gap: 16px;
  }

  .operation-buttons {
    width: 100%;
    justify-content: center;
  }

  .matrix-grid {
    max-width: 200px;
  }

  .matrix-cell {
    width: 60px;
    height: 60px;
    font-size: 1rem;
  }
}

.loading {
  opacity: 0.6;
  pointer-events: none;
}

.loading::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  width: 20px;
  height: 20px;
  margin: -10px 0 0 -10px;
  border: 2px solid var(--border-color);
  border-top: 2px solid var(--accent-green);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  0% {
    transform: rotate(0deg);
  }
  100% {
    transform: rotate(360deg);
  }
}