:root {
  --bg-color: #141414;
  --card-bg: #1e1e1e;
  --card-border: #2e2e2e;
  --accent-color: #dfff4f;
  --text-primary: #f5f5f5;
  --text-secondary: #9e9e9e;
  --accent-dark: #b8d436;
  --radius-lg: 16px;
  --radius-md: 10px;
  --radius-sm: 6px;
  --font-main: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", "Hiragino Kaku Gothic ProN", "Yu Gothic", sans-serif;
}

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

body {
  background-color: var(--bg-color);
  color: var(--text-primary);
  font-family: var(--font-main);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.app-header {
  border-bottom: 1px solid var(--card-border);
  padding: 16px 24px;
}

.header-inner {
  max-width: 900px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--text-primary);
}

.brand-mark {
  background-color: var(--accent-color);
  color: #141414;
  font-weight: 900;
  width: 28px;
  height: 28px;
  border-radius: 6px;
  display: grid;
  place-items: center;
  font-size: 14px;
}

.brand-name {
  font-weight: 700;
  font-size: 15px;
}

.brand-name em {
  font-style: normal;
  color: var(--accent-color);
  margin-left: 4px;
}

.back-link {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 13px;
  transition: color 0.2s;
}

.back-link:hover {
  color: var(--accent-color);
}

.main-container {
  max-width: 900px;
  margin: 0 auto;
  padding: 48px 24px 64px;
  flex: 1;
  width: 100%;
}

.hero-section {
  text-align: center;
  margin-bottom: 40px;
}

.tagline {
  color: var(--accent-color);
  font-size: 12px;
  letter-spacing: 2px;
  font-weight: 700;
  margin-bottom: 12px;
}

.hero-section h1 {
  font-size: clamp(24px, 5vw, 36px);
  font-weight: 800;
  line-height: 1.3;
  margin-bottom: 16px;
}

.accent-text {
  color: var(--accent-color);
}

.lead {
  color: var(--text-secondary);
  font-size: 14px;
  max-width: 600px;
  margin: 0 auto;
}

.translator-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-lg);
  padding: 32px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

.mode-tabs {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-bottom: 24px;
}

.tab-button {
  background: #181818;
  border: 1px solid var(--card-border);
  color: var(--text-secondary);
  padding: 14px 16px;
  border-radius: var(--radius-md);
  cursor: pointer;
  text-align: left;
  transition: all 0.2s;
}

.tab-button span {
  display: block;
  font-size: 14px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.tab-button small {
  display: block;
  font-size: 11px;
}

.tab-button.is-active {
  border-color: var(--accent-color);
  background: #242718;
}

.tab-button.is-active span {
  color: var(--accent-color);
}

.preset-section {
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.preset-label {
  font-size: 12px;
  color: var(--text-secondary);
}

.preset-chips {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.chip-btn {
  background: #282828;
  border: 1px solid #3a3a3a;
  color: var(--text-primary);
  padding: 4px 10px;
  border-radius: 20px;
  font-size: 12px;
  cursor: pointer;
  transition: all 0.15s;
}

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

.input-wrap {
  display: flex;
  gap: 12px;
}

.input-wrap input {
  flex: 1;
  background: #141414;
  border: 1px solid var(--card-border);
  border-radius: var(--radius-md);
  padding: 16px 20px;
  color: var(--text-primary);
  font-size: 15px;
  outline: none;
  transition: border-color 0.2s;
}

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

.submit-button {
  background: var(--accent-color);
  color: #141414;
  border: none;
  border-radius: var(--radius-md);
  padding: 0 24px;
  font-weight: 700;
  font-size: 15px;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 8px;
  transition: background-color 0.2s, transform 0.1s;
  white-space: nowrap;
}

.submit-button:hover {
  background: var(--accent-dark);
}

.submit-button:active {
  transform: scale(0.98);
}

.input-meta {
  display: flex;
  justify-content: space-between;
  margin-top: 8px;
  font-size: 11px;
  color: var(--text-secondary);
}

.loading-state {
  margin-top: 32px;
  text-align: center;
  padding: 32px 0;
}

.hedgehog-loader {
  font-size: 36px;
  display: inline-block;
  animation: bounce 0.8s infinite alternate ease-in-out;
}

@keyframes bounce {
  from { transform: translateY(0); }
  to { transform: translateY(-10px); }
}

.loading-text {
  margin-top: 12px;
  font-size: 13px;
  color: var(--text-secondary);
}

.result-box {
  margin-top: 32px;
  background: #161616;
  border: 1px solid #333;
  border-radius: var(--radius-md);
  padding: 24px;
}

.result-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid #2a2a2a;
}

.result-badge {
  color: var(--accent-color);
  font-weight: 700;
  font-size: 13px;
  letter-spacing: 1px;
}

.copy-button {
  background: #2a2a2a;
  border: 1px solid #3a3a3a;
  color: var(--text-primary);
  padding: 4px 12px;
  border-radius: var(--radius-sm);
  font-size: 12px;
  cursor: pointer;
  transition: all 0.2s;
}

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

.result-content {
  font-size: 14px;
  line-height: 1.8;
  white-space: pre-wrap;
  color: #e0e0e0;
}

.app-footer {
  border-top: 1px solid var(--card-border);
  padding: 24px;
  text-align: center;
  font-size: 12px;
  color: var(--text-secondary);
}

@media (max-width: 600px) {
  .mode-tabs {
    grid-template-columns: 1fr;
  }
  .input-wrap {
    flex-direction: column;
  }
  .submit-button {
    padding: 14px;
    justify-content: center;
  }
}