/* ===========================================
   Web3 Zero-Click Security Wiki
   GitHub Security Advisories + Notion Style
   =========================================== */

/* CSS Variables */
:root {
  --bg-primary: #f6f8fa;
  --bg-card: #ffffff;
  --bg-code: #afb8c133;
  --bg-warning: #fff8c5;
  --text-primary: #24292f;
  --text-secondary: #57606a;
  --accent-danger: #cf222e;
  --border-light: #d0d7de;
  --shadow-card: 0 1px 3px rgba(140, 149, 159, 0.15);
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans SC", "Helvetica Neue", sans-serif;
  --font-mono: "SF Mono", "Consolas", "Liberation Mono", Menlo, monospace;
  --transition-fast: 0.2s ease-out;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Container */
.container {
  max-width: 860px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ===========================================
   Hero Section
   =========================================== */
.hero {
  padding: 80px 0 60px;
  text-align: center;
  border-bottom: 1px solid var(--border-light);
  background: linear-gradient(180deg, #ffffff 0%, var(--bg-primary) 100%);
}

.hero-title {
  font-size: 2.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  margin-bottom: 12px;
  line-height: 1.3;
}

.hero-subtitle {
  font-size: 1.125rem;
  color: var(--text-secondary);
  max-width: 640px;
  margin: 0 auto 32px;
}

/* Warning Banner */
.warning-banner {
  display: inline-block;
  background-color: var(--bg-warning);
  border: 1px solid #e3d9a0;
  border-radius: 6px;
  padding: 12px 20px;
  font-size: 0.875rem;
  color: #6e5c0a;
  max-width: 680px;
  text-align: left;
  margin-top: 16px;
}

/* ===========================================
   Content Sections
   =========================================== */
.content {
  padding: 48px 0 80px;
}

.intro-text {
  font-size: 1rem;
  color: var(--text-secondary);
  line-height: 1.8;
  padding: 24px;
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: 8px;
  margin-bottom: 48px;
  border-left: 4px solid var(--accent-danger);
}

.intro-text strong {
  color: var(--text-primary);
}

/* Step Cards */
.step-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: 8px;
  padding: 28px 32px;
  margin-bottom: 32px;
  box-shadow: var(--shadow-card);
  opacity: 0.5;
  transform: translateY(8px);
  transition: opacity var(--transition-fast), 
              transform var(--transition-fast),
              border-left-color var(--transition-fast);
  border-left: 4px solid transparent;
}

.step-card.active {
  opacity: 1;
  transform: translateY(0);
  border-left-color: var(--accent-danger);
}

.step-label {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent-danger);
  background: rgba(207, 34, 46, 0.08);
  padding: 4px 10px;
  border-radius: 4px;
  margin-bottom: 16px;
  font-weight: 500;
}

.step-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 20px;
}

.step-time {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: var(--text-secondary);
  background: var(--bg-code);
  padding: 4px 10px;
  border-radius: 4px;
}

.step-title {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 16px;
}

.step-content {
  color: var(--text-secondary);
  font-size: 0.9375rem;
  line-height: 1.75;
}

.step-content p {
  margin-bottom: 16px;
}

.step-content strong {
  color: var(--text-primary);
}

.breakthrough {
  background: rgba(207, 34, 46, 0.04);
  border: 1px solid rgba(207, 34, 46, 0.15);
  border-radius: 6px;
  padding: 16px 20px;
  margin: 20px 0;
}

.breakthrough-title {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--accent-danger);
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 6px;
}

.breakthrough-title::before {
  content: "⚡";
}

.breakthrough-text {
  font-size: 0.875rem;
  color: var(--text-primary);
  line-height: 1.7;
}

/* Code Block */
.code-block {
  background: #1c2128;
  border-radius: 8px;
  margin: 24px 0;
  overflow: hidden;
}

.code-header {
  background: #2d333b;
  padding: 10px 16px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: #adbac7;
  display: flex;
  align-items: center;
  gap: 8px;
}

.code-header::before {
  content: "";
  display: inline-block;
  width: 10px;
  height: 10px;
  background: #f47067;
  border-radius: 50%;
  box-shadow: 14px 0 0 #f4b23f, 28px 0 0 #57ab5a;
}

.code-content {
  padding: 20px;
  overflow-x: auto;
}

.code-content pre {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  line-height: 1.6;
  color: #adbac7;
  white-space: pre;
}

.code-comment {
  color: #768390;
}

.code-keyword {
  color: #f47067;
}

.code-string {
  color: #96d0ff;
}

.code-function {
  color: #f69d50;
}

.code-number {
  color: #ae7c14;
}

.code-variable {
  color: #f47067;
}

.code-operator {
  color: #f47067;
}

/* ===========================================
   Summary Section
   =========================================== */
.summary {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: 8px;
  padding: 32px;
  margin-top: 48px;
  opacity: 0.5;
  transform: translateY(8px);
  transition: opacity var(--transition-fast), transform var(--transition-fast);
  border-left: 4px solid transparent;
}

.summary.active {
  opacity: 1;
  transform: translateY(0);
  border-left-color: var(--accent-danger);
}

.summary-title {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.summary-content {
  color: var(--text-secondary);
  font-size: 0.9375rem;
  line-height: 1.75;
}

.footer-note {
  margin-top: 24px;
  padding-top: 20px;
  border-top: 1px solid var(--border-light);
  font-size: 0.8125rem;
  color: var(--text-secondary);
  font-style: italic;
}

/* ===========================================
   Responsive Design
   =========================================== */
@media (max-width: 768px) {
  .container {
    padding: 0 16px;
  }
  
  .hero {
    padding: 48px 0 40px;
  }
  
  .hero-title {
    font-size: 1.75rem;
  }
  
  .hero-subtitle {
    font-size: 1rem;
  }
  
  .warning-banner {
    font-size: 0.8125rem;
    padding: 10px 14px;
  }
  
  .step-card,
  .summary {
    padding: 20px;
  }
  
  .step-title {
    font-size: 1.125rem;
  }
  
  .code-content pre {
    font-size: 0.75rem;
  }
}

/* ===========================================
   Language Switcher
   =========================================== */
.lang-nav {
  background: rgba(255, 255, 255, 0.98);
  padding: 12px 24px;
  border-bottom: 1px solid var(--border-light);
  text-align: right;
}

.lang-switcher {
  display: inline-flex;
  gap: 4px;
  background: var(--bg-primary);
  padding: 4px;
  border-radius: 6px;
  border: 1px solid var(--border-light);
}

.lang-btn {
  padding: 6px 12px;
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--text-secondary);
  background: transparent;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  transition: all var(--transition-fast);
  font-family: var(--font-sans);
}

.lang-btn:hover {
  background: rgba(207, 34, 46, 0.06);
  color: var(--text-primary);
}

.lang-btn.active {
  background: var(--accent-danger);
  color: #ffffff;
}

/* ===========================================
   Print Styles (for offline reading)
   =========================================== */
@media print {
  .step-card,
  .summary {
    opacity: 1 !important;
    transform: none !important;
    border-left-color: var(--accent-danger) !important;
    page-break-inside: avoid;
  }
  
  .code-block {
    background: #f6f8fa !important;
    border: 1px solid var(--border-light);
  }
  
  .code-content pre {
    color: var(--text-primary) !important;
  }
  
  .lang-nav {
    display: none;
  }
}

/* Responsive for Language Switcher */
@media (max-width: 768px) {
  .lang-nav {
    padding: 10px 16px;
    text-align: center;
  }
  
  .lang-switcher {
    flex-wrap: wrap;
    justify-content: center;
  }
  
  .lang-btn {
    padding: 5px 10px;
    font-size: 0.75rem;
  }
}

/* ===========================================
   Browser Warning Modal
   =========================================== */
.browser-warning-modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(4px);
  z-index: 9999;
  display: none;
  justify-content: center;
  align-items: center;
  padding: 20px;
}

.browser-warning-modal.show {
  display: flex;
}

.browser-warning-content {
  background: var(--bg-card);
  border-radius: 12px;
  padding: 40px;
  max-width: 480px;
  width: 100%;
  text-align: center;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
  border: 1px solid var(--border-light);
}

.browser-warning-icon {
  font-size: 3rem;
  margin-bottom: 20px;
}

.browser-warning-title {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 16px;
}

.browser-warning-text {
  font-size: 1rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 0;
}

@media (max-width: 768px) {
  .browser-warning-content {
    padding: 24px;
    margin: 16px;
  }
  
  .browser-warning-title {
    font-size: 1.25rem;
  }
  
  .browser-warning-text {
    font-size: 0.9375rem;
  }
}