/* ========== CSS 变量 ========== */
:root {
  --color-bg: #0A0A0F;
  --color-bg-card: #141419;
  --color-bg-input: #1A1A22;
  --color-bg-hover: #1E1E28;
  --color-primary: #00E5C8;
  --color-primary-hover: #00FFE0;
  --color-primary-dim: rgba(0, 229, 200, 0.15);
  --color-text: #E8E8ED;
  --color-text-secondary: #8A8A9A;
  --color-text-dim: #5A5A6A;
  --color-border: #2A2A35;
  --color-border-light: #3A3A48;
  --color-accent: #7B61FF;
  --color-success: #00E676;
  --color-warning: #FFB800;
  --shadow-card: 0 4px 20px rgba(0, 0, 0, 0.3);
  --shadow-glow: 0 0 30px rgba(0, 229, 200, 0.1);
  --radius: 14px;
  --radius-sm: 8px;
  --max-width: 760px;
  --font-main: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}

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

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

#app {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
}

/* ========== 导航栏 ========== */
.navbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 0;
  border-bottom: 1px solid var(--color-border);
}

.navbar-brand {
  font-weight: 700;
  font-size: 15px;
  color: var(--color-text);
}

.navbar-link {
  color: var(--color-text-secondary);
  text-decoration: none;
  font-size: 14px;
  transition: color 0.2s;
}

.navbar-link:hover {
  color: var(--color-primary);
}

/* ========== Hero ========== */
.hero {
  text-align: center;
  padding: 80px 0 60px;
}

.hero-badge {
  display: inline-block;
  border: 1px solid var(--color-primary);
  color: var(--color-primary);
  font-size: 13px;
  padding: 6px 18px;
  border-radius: 20px;
  margin-bottom: 24px;
  letter-spacing: 1px;
}

.hero-title {
  font-size: 2.6em;
  font-weight: 800;
  line-height: 1.3;
  margin-bottom: 20px;
  color: var(--color-text);
}

.hero-desc {
  font-size: 16px;
  color: var(--color-text-secondary);
  line-height: 1.8;
  max-width: 600px;
  margin: 0 auto 36px;
}

.btn-hero {
  display: inline-block;
  background: var(--color-primary);
  color: var(--color-bg);
  font-size: 18px;
  font-weight: 700;
  padding: 16px 48px;
  border: none;
  border-radius: var(--radius);
  cursor: pointer;
  transition: all 0.2s;
}

.btn-hero:hover {
  background: var(--color-primary-hover);
  transform: translateY(-2px);
  box-shadow: var(--shadow-glow);
}

/* ========== 进度条 ========== */
.progress-bar {
  padding: 24px 0;
  margin-bottom: 12px;
}

.progress-steps {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0;
}

.progress-step {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  min-width: 80px;
}

.step-number {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--color-bg-card);
  border: 2px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  font-weight: 700;
  color: var(--color-text-dim);
  transition: all 0.3s;
}

.progress-step.active .step-number {
  border-color: var(--color-primary);
  color: var(--color-primary);
  background: var(--color-primary-dim);
}

.progress-step.done .step-number {
  border-color: var(--color-success);
  color: var(--color-bg);
  background: var(--color-success);
}

.step-label {
  font-size: 12px;
  color: var(--color-text-dim);
  white-space: nowrap;
  transition: color 0.3s;
}

.progress-step.active .step-label {
  color: var(--color-primary);
}

.progress-line {
  width: 40px;
  height: 2px;
  background: var(--color-border);
  margin-bottom: 20px;
  flex-shrink: 0;
}

/* ========== 步骤卡片 ========== */
.step-section {
  margin-bottom: 20px;
}

.step-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 28px 24px;
  box-shadow: var(--shadow-card);
}

.step-header h2 {
  font-size: 1.3em;
  margin-bottom: 8px;
  color: var(--color-text);
}

.step-desc {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: 20px;
}

.step-tip {
  background: var(--color-primary-dim);
  border: 1px solid rgba(0, 229, 200, 0.2);
  border-radius: var(--radius-sm);
  padding: 12px 16px;
  font-size: 13px;
  color: var(--color-primary);
  margin-bottom: 16px;
  line-height: 1.6;
}

/* ========== 输入框 ========== */
textarea {
  width: 100%;
  background: var(--color-bg-input);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 16px;
  color: var(--color-text);
  font-size: 15px;
  font-family: var(--font-main);
  resize: vertical;
  outline: none;
  line-height: 1.6;
  transition: border-color 0.2s;
}

textarea:focus {
  border-color: var(--color-primary);
}

textarea::placeholder {
  color: var(--color-text-dim);
}

/* ========== 输入底部 ========== */
.input-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 12px;
}

.char-count {
  font-size: 13px;
  color: var(--color-text-dim);
}

/* ========== 按钮：主要 ========== */
.btn-primary {
  background: var(--color-primary);
  color: var(--color-bg);
  border: none;
  padding: 10px 24px;
  border-radius: var(--radius-sm);
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
}

.btn-primary:hover {
  background: var(--color-primary-hover);
}

/* ========== 抖动动画 ========== */
@keyframes shake {
  0%, 100% { transform: translateX(0); }
  20% { transform: translateX(-6px); }
  40% { transform: translateX(6px); }
  60% { transform: translateX(-4px); }
  80% { transform: translateX(4px); }
}

.shake {
  animation: shake 0.4s ease;
}

/* ========== 示例灵感墙 ========== */
.examples-area {
  margin-top: 24px;
  padding-top: 20px;
  border-top: 1px solid var(--color-border);
}

.examples-title {
  font-size: 13px;
  color: var(--color-text-secondary);
  margin-bottom: 12px;
}

.examples-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 8px;
}

.example-card {
  background: var(--color-bg-input);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 12px 8px;
  cursor: pointer;
  text-align: center;
  transition: all 0.2s;
  display: flex;
  flex-direction: column;
  gap: 4px;
  user-select: none;
}

.example-card:hover {
  border-color: var(--color-primary);
  transform: translateY(-2px);
}

.example-emoji {
  font-size: 22px;
}

.example-text {
  font-size: 13px;
  font-weight: 600;
  color: var(--color-text);
}

.example-desc {
  font-size: 11px;
  color: var(--color-text-dim);
}

/* ========== 输出区域 ========== */
.output-section {
  margin-bottom: 20px;
}

.output-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 28px 24px;
  box-shadow: var(--shadow-card);
  margin-top: 20px;
}

.output-header h3 {
  font-size: 1.1em;
  margin-bottom: 16px;
}

.output-prompt {
  background: var(--color-bg-input);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 20px;
  font-size: 13px;
  line-height: 1.8;
  color: var(--color-text-secondary);
  white-space: pre-wrap;
  word-break: break-word;
  max-height: 400px;
  overflow-y: auto;
}

/* ========== 复制按钮 ========== */
.output-actions {
  margin-top: 16px;
}

.btn-copy {
  width: 100%;
  padding: 14px;
  background: var(--color-primary);
  color: var(--color-bg);
  border: none;
  border-radius: var(--radius-sm);
  font-size: 16px;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.2s;
  margin-top: 0;
}

.btn-copy:hover {
  background: var(--color-primary-hover);
}

/* ========== 步骤提示 ========== */
.steps-hint {
  margin-top: 20px;
  padding: 16px;
  background: rgba(0, 229, 200, 0.05);
  border-radius: var(--radius-sm);
  border: 1px solid rgba(0, 229, 200, 0.1);
}

.step-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 5px 0;
  font-size: 14px;
  color: var(--color-text-secondary);
}

.step-num {
  color: var(--color-primary);
  font-weight: 700;
  font-size: 15px;
  flex-shrink: 0;
}

/* ========== 工具入口 ========== */
.tools-area {
  margin-top: 20px;
}

.tools-title {
  font-size: 13px;
  color: var(--color-text-secondary);
  margin-bottom: 10px;
}

.tools-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px;
}

.tool-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 16px 12px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
  background: var(--color-bg-input);
  text-decoration: none;
  color: var(--color-text);
  transition: all 0.2s;
  cursor: pointer;
  position: relative;
}

.tool-btn:hover {
  border-color: var(--color-primary);
  transform: translateY(-2px);
}

.tool-highlight {
  border-color: var(--color-primary);
  background: var(--color-primary-dim);
}

.tool-icon {
  font-size: 24px;
  margin-bottom: 4px;
}

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

.tool-desc {
  font-size: 11px;
  color: var(--color-text-dim);
  margin-top: 2px;
  text-align: center;
}

.tool-badge {
  position: absolute;
  top: -8px;
  right: -8px;
  background: var(--color-primary);
  color: var(--color-bg);
  font-size: 11px;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 10px;
}

/* ========== 下一步按钮 ========== */
.next-step-area {
  margin-top: 8px;
}

.btn-next {
  width: 100%;
  padding: 14px;
  background: transparent;
  color: var(--color-primary);
  border: 2px solid var(--color-primary);
  border-radius: var(--radius-sm);
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
  margin-top: 16px;
}

.btn-next:hover {
  background: var(--color-primary-dim);
}

/* ========== 完成页面 ========== */
.done-section {
  text-align: center;
  padding: 60px 0;
}

.done-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 48px 32px;
}

.done-icon {
  font-size: 64px;
  margin-bottom: 20px;
}

.done-card h2 {
  font-size: 1.5em;
  margin-bottom: 12px;
}

.done-card p {
  color: var(--color-text-secondary);
  margin-bottom: 28px;
}

.done-actions {
  display: flex;
  flex-direction: column;
  gap: 12px;
  align-items: center;
}

.btn-secondary-link {
  color: var(--color-text-secondary);
  text-decoration: none;
  font-size: 14px;
  transition: color 0.2s;
}

.btn-secondary-link:hover {
  color: var(--color-primary);
}

/* ========== 历史记录 ========== */
.history-section {
  margin-top: 40px;
}

.section-label {
  font-size: 14px;
  color: var(--color-text-secondary);
  margin-bottom: 12px;
}

.history-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  margin-bottom: 6px;
  cursor: pointer;
  transition: all 0.2s;
}

.history-item:hover {
  border-color: var(--color-primary);
}

.history-idea {
  flex: 1;
  font-size: 14px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.history-step {
  font-size: 12px;
  color: var(--color-primary);
  white-space: nowrap;
}

.history-date {
  font-size: 12px;
  color: var(--color-text-dim);
  white-space: nowrap;
}

/* ========== 页脚 ========== */
.footer {
  text-align: center;
  margin-top: 60px;
  padding: 24px 0;
  border-top: 1px solid var(--color-border);
  font-size: 13px;
  color: var(--color-text-dim);
}

.footer p {
  margin: 6px 0;
}

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

.footer a:hover {
  text-decoration: underline;
}

/* ========== 响应式（移动端） ========== */
@media (max-width: 480px) {
  #app {
    padding: 0 16px;
  }

  .hero {
    padding: 48px 0 36px;
  }

  .hero-title {
    font-size: 1.8em;
  }

  .btn-hero {
    padding: 14px 36px;
    font-size: 16px;
  }

  .examples-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .step-card {
    padding: 20px 16px;
  }

  .output-card {
    padding: 20px 16px;
  }

  .progress-step {
    min-width: 60px;
  }

  .step-label {
    font-size: 10px;
  }

  .progress-line {
    width: 20px;
  }
}