/* ===== Variables ===== */
:root {
  --bg: #0F172A;
  --bg-card: #1E293B;
  --bg-secondary: #162032;
  --bg-input: #0F172A;
  --accent: #7C3AED;
  --accent-light: #8B5CF6;
  --accent-hover: #6D28D9;
  --text: #F1F5F9;
  --text-muted: #94A3B8;
  --text-dim: #64748B;
  --border: #334155;
  --border-light: #475569;
  --success: #10B981;
  --success-bg: rgba(16,185,129,.1);
  --warning: #F59E0B;
  --warning-bg: rgba(245,158,11,.1);
  --error: #EF4444;
  --error-bg: rgba(239,68,68,.1);
  --info: #3B82F6;
  --info-bg: rgba(59,130,246,.1);
  --radius: 10px;
  --radius-sm: 6px;
  --shadow: 0 4px 24px rgba(0,0,0,.4);
  --font: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  --mono: 'Fira Code', 'Cascadia Code', 'Consolas', 'Courier New', monospace;
}

/* ===== Reset ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  font-size: 16px;
}
img { max-width: 100%; display: block; }
a { color: var(--accent-light); text-decoration: none; }
a:hover { color: var(--text); }

/* ===== Layout ===== */
.container { max-width: 1100px; margin: 0 auto; padding: 0 20px; }
.container-sm { max-width: 780px; margin: 0 auto; padding: 0 20px; }

/* ===== Header / Nav ===== */
header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(15,23,42,.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}
nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
}
.nav-logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--text);
}
.nav-logo .logo-icon {
  width: 30px; height: 30px;
  background: linear-gradient(135deg, var(--accent), var(--accent-light));
  border-radius: 8px;
  display: flex; align-items: center; justify-content: center;
  font-size: 15px;
}
.nav-links {
  display: flex;
  gap: 6px;
  list-style: none;
}
.nav-links a {
  color: var(--text-muted);
  font-size: .9rem;
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  transition: all .2s;
}
.nav-links a:hover, .nav-links a.active {
  color: var(--text);
  background: var(--bg-card);
}
.nav-cta {
  background: var(--accent) !important;
  color: var(--text) !important;
}
.nav-cta:hover { background: var(--accent-hover) !important; }

/* ===== Hero ===== */
.hero {
  padding: 70px 0 50px;
  text-align: center;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 99px;
  padding: 5px 14px;
  font-size: .8rem;
  color: var(--accent-light);
  margin-bottom: 20px;
}
.hero h1 {
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 800;
  line-height: 1.15;
  margin-bottom: 16px;
  background: linear-gradient(135deg, #F1F5F9 0%, #94A3B8 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero p {
  font-size: 1.1rem;
  color: var(--text-muted);
  max-width: 560px;
  margin: 0 auto 28px;
}
.hero-stats {
  display: flex;
  justify-content: center;
  gap: 32px;
  margin-top: 40px;
  flex-wrap: wrap;
}
.hero-stat { text-align: center; }
.hero-stat strong { display: block; font-size: 1.4rem; color: var(--accent-light); }
.hero-stat span { font-size: .8rem; color: var(--text-muted); }

/* ===== Tool Section ===== */
.tool-section { padding: 20px 0 60px; }

.tool-tabs {
  display: flex;
  gap: 4px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 4px;
  margin-bottom: 24px;
  width: fit-content;
}
.tab-btn {
  background: none;
  border: none;
  cursor: pointer;
  color: var(--text-muted);
  font-size: .9rem;
  padding: 8px 18px;
  border-radius: var(--radius-sm);
  transition: all .2s;
  font-family: var(--font);
}
.tab-btn:hover { color: var(--text); }
.tab-btn.active {
  background: var(--accent);
  color: var(--text);
}

.tab-panel { display: none; }
.tab-panel.active { display: block; }

/* Formatter */
.formatter-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-bottom: 20px;
}
.panel-label {
  font-size: .75rem;
  text-transform: uppercase;
  letter-spacing: .08em;
  color: var(--text-dim);
  margin-bottom: 8px;
  font-weight: 600;
}
textarea {
  width: 100%;
  height: 240px;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  font-family: var(--mono);
  font-size: .88rem;
  padding: 14px;
  resize: vertical;
  line-height: 1.6;
  outline: none;
  transition: border-color .2s;
}
textarea:focus { border-color: var(--accent-light); }
textarea::placeholder { color: var(--text-dim); }

.output-box {
  min-height: 240px;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px;
  font-family: var(--mono);
  font-size: .88rem;
  line-height: 1.6;
  color: var(--text-muted);
  white-space: pre-wrap;
  word-break: break-word;
  position: relative;
}
.output-box.has-content { color: var(--text); }
.output-placeholder { color: var(--text-dim); font-style: italic; }

.tool-actions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 10px 20px;
  border-radius: var(--radius-sm);
  border: none;
  cursor: pointer;
  font-size: .9rem;
  font-family: var(--font);
  font-weight: 500;
  transition: all .2s;
  white-space: nowrap;
}
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: var(--accent-hover); transform: translateY(-1px); }
.btn-secondary {
  background: var(--bg-card);
  color: var(--text-muted);
  border: 1px solid var(--border);
}
.btn-secondary:hover { color: var(--text); border-color: var(--border-light); }
.btn-ghost { background: none; color: var(--text-muted); border: 1px solid var(--border); }
.btn-ghost:hover { color: var(--text); background: var(--bg-card); }
.btn-sm { padding: 6px 14px; font-size: .82rem; }
.btn-copy { position: absolute; top: 10px; right: 10px; }

/* Score */
.score-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px 24px;
  margin-top: 20px;
}
.score-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
}
.score-header h3 { font-size: 1rem; }
.score-badge {
  padding: 4px 12px;
  border-radius: 99px;
  font-size: .82rem;
  font-weight: 700;
}
.score-badge.poor { background: var(--error-bg); color: var(--error); }
.score-badge.fair { background: var(--warning-bg); color: var(--warning); }
.score-badge.good { background: var(--info-bg); color: var(--info); }
.score-badge.great { background: var(--success-bg); color: var(--success); }

.score-bar-track {
  background: var(--border);
  border-radius: 99px;
  height: 8px;
  margin-bottom: 20px;
  overflow: hidden;
}
.score-bar-fill {
  height: 100%;
  border-radius: 99px;
  background: linear-gradient(90deg, var(--accent), var(--accent-light));
  transition: width .6s ease;
}

.checks-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 8px;
  margin-bottom: 20px;
}
.check-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: .85rem;
  color: var(--text-muted);
}
.check-dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
}
.check-dot.pass { background: var(--success); }
.check-dot.fail { background: var(--border-light); }

.tips-list { display: flex; flex-direction: column; gap: 8px; }
.tip-item {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  font-size: .85rem;
}
.tip-item.error { background: var(--error-bg); border-left: 3px solid var(--error); }
.tip-item.warning { background: var(--warning-bg); border-left: 3px solid var(--warning); }
.tip-item.info { background: var(--info-bg); border-left: 3px solid var(--info); }
.tip-icon { flex-shrink: 0; margin-top: 1px; }

/* Templates */
.templates-filter {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 20px;
}
.filter-btn {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 99px;
  color: var(--text-muted);
  font-size: .82rem;
  padding: 5px 14px;
  cursor: pointer;
  transition: all .2s;
  font-family: var(--font);
}
.filter-btn:hover, .filter-btn.active {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

.templates-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 14px;
}
.template-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px;
  cursor: pointer;
  transition: all .2s;
}
.template-card:hover {
  border-color: var(--accent-light);
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}
.template-card-header {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 8px;
}
.template-icon {
  width: 32px; height: 32px;
  background: var(--bg-secondary);
  border-radius: var(--radius-sm);
  display: flex; align-items: center; justify-content: center;
  font-size: 16px;
}
.template-card h4 { font-size: .95rem; }
.template-cat {
  margin-left: auto;
  font-size: .72rem;
  padding: 2px 8px;
  background: var(--bg-secondary);
  border-radius: 99px;
  color: var(--text-dim);
}
.template-card p {
  font-size: .83rem;
  color: var(--text-muted);
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* How it works */
.features-section { padding: 60px 0; }
.section-header { text-align: center; margin-bottom: 48px; }
.section-header h2 { font-size: 1.9rem; margin-bottom: 10px; }
.section-header p { color: var(--text-muted); }

.steps-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.step-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 24px;
  text-align: center;
}
.step-number {
  width: 42px; height: 42px;
  background: linear-gradient(135deg, var(--accent), var(--accent-light));
  border-radius: 12px;
  display: flex; align-items: center; justify-content: center;
  font-weight: 700;
  font-size: 1.1rem;
  margin: 0 auto 16px;
}
.step-card h3 { font-size: 1rem; margin-bottom: 8px; }
.step-card p { font-size: .88rem; color: var(--text-muted); }

/* Guides preview */
.guides-section { padding: 60px 0; }
.guides-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(310px, 1fr));
  gap: 20px;
}
.guide-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  transition: all .2s;
}
.guide-card:hover {
  border-color: var(--accent-light);
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}
.guide-tag {
  display: inline-block;
  font-size: .72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .06em;
  padding: 3px 10px;
  border-radius: 99px;
  margin-bottom: 12px;
}
.tag-beginner { background: var(--success-bg); color: var(--success); }
.tag-intermediate { background: var(--warning-bg); color: var(--warning); }
.tag-advanced { background: var(--error-bg); color: var(--error); }

.guide-card h3 { font-size: 1.05rem; margin-bottom: 8px; }
.guide-card p { font-size: .88rem; color: var(--text-muted); margin-bottom: 16px; line-height: 1.5; }
.guide-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: .8rem;
  color: var(--text-dim);
}
.guide-read-more {
  color: var(--accent-light);
  font-size: .85rem;
  display: flex;
  align-items: center;
  gap: 4px;
}

/* Footer */
footer {
  border-top: 1px solid var(--border);
  padding: 48px 0 24px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}
.footer-brand p {
  font-size: .88rem;
  color: var(--text-muted);
  margin-top: 10px;
  line-height: 1.6;
}
.footer-col h4 {
  font-size: .85rem;
  text-transform: uppercase;
  letter-spacing: .06em;
  color: var(--text-dim);
  margin-bottom: 14px;
}
.footer-col ul { list-style: none; }
.footer-col li { margin-bottom: 8px; }
.footer-col a { color: var(--text-muted); font-size: .88rem; }
.footer-col a:hover { color: var(--text); }
.footer-bottom {
  border-top: 1px solid var(--border);
  padding-top: 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: .82rem;
  color: var(--text-dim);
}

/* ===== Inner Pages ===== */
.page-hero {
  padding: 56px 0 40px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 48px;
}
.page-hero h1 { font-size: 2rem; margin-bottom: 8px; }
.page-hero p { color: var(--text-muted); }
.breadcrumb {
  font-size: .82rem;
  color: var(--text-dim);
  margin-bottom: 16px;
}
.breadcrumb a { color: var(--text-dim); }
.breadcrumb a:hover { color: var(--text); }

.prose {
  color: var(--text-muted);
  line-height: 1.8;
}
.prose h2 {
  font-size: 1.4rem;
  color: var(--text);
  margin: 36px 0 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border);
}
.prose h3 { font-size: 1.1rem; color: var(--text); margin: 28px 0 10px; }
.prose p { margin-bottom: 18px; }
.prose ul, .prose ol { padding-left: 24px; margin-bottom: 18px; }
.prose li { margin-bottom: 6px; }
.prose code {
  background: var(--bg-card);
  border: 1px solid var(--border);
  padding: 2px 7px;
  border-radius: 4px;
  font-family: var(--mono);
  font-size: .87em;
  color: var(--accent-light);
}
.prose pre {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px;
  overflow-x: auto;
  margin-bottom: 20px;
  font-family: var(--mono);
  font-size: .88rem;
  line-height: 1.6;
}
.prose pre code { background: none; border: none; padding: 0; color: var(--text); }
.prose blockquote {
  border-left: 3px solid var(--accent);
  padding: 12px 18px;
  background: var(--bg-card);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin-bottom: 20px;
  font-style: italic;
  color: var(--text);
}
.prose strong { color: var(--text); }
.prose a { color: var(--accent-light); }
.prose a:hover { text-decoration: underline; }

/* Article header */
.article-header { margin-bottom: 40px; }
.article-header h1 { font-size: 1.9rem; line-height: 1.3; margin-bottom: 14px; }
.article-meta {
  display: flex;
  gap: 16px;
  font-size: .82rem;
  color: var(--text-dim);
  flex-wrap: wrap;
}

/* Contact form */
.contact-form {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
}
.form-group { margin-bottom: 20px; }
.form-group label {
  display: block;
  font-size: .88rem;
  color: var(--text-muted);
  margin-bottom: 7px;
}
.form-group input, .form-group textarea, .form-group select {
  width: 100%;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-family: var(--font);
  font-size: .9rem;
  padding: 10px 14px;
  outline: none;
  transition: border-color .2s;
}
.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus { border-color: var(--accent-light); }
.form-group textarea { min-height: 130px; resize: vertical; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }

/* Toast */
.toast {
  position: fixed;
  bottom: 24px;
  right: 24px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 12px 18px;
  font-size: .88rem;
  box-shadow: var(--shadow);
  transform: translateY(80px);
  opacity: 0;
  transition: all .3s ease;
  z-index: 1000;
}
.toast.show { transform: translateY(0); opacity: 1; }
.toast.success { border-left: 3px solid var(--success); }

/* ===== Responsive ===== */
@media (max-width: 900px) {
  .formatter-grid { grid-template-columns: 1fr; }
  .steps-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 640px) {
  .nav-links { display: none; }
  .hero h1 { font-size: 1.8rem; }
  .hero-stats { gap: 20px; }
  .footer-grid { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; gap: 8px; text-align: center; }
  .form-row { grid-template-columns: 1fr; }
}