/* ==============================================================================
   PromptCraftKit.tech - Frontend Stylesheet
   Modern Tech Aesthetic, Fast TTFB, Zero-Framework Pure Vanilla CSS
   ============================================================================== */

:root {
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;

  /* Dark Theme (Default) */
  --bg-body: #0b0f19;
  --bg-surface: #111827;
  --bg-card: #1e293b;
  --bg-card-hover: #24344d;
  --bg-input: #0f172a;
  --border-color: #334155;
  --border-glow: rgba(99, 102, 241, 0.25);
  
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-dim: #64748b;

  --accent-primary: #6366f1;
  --accent-primary-hover: #4f46e5;
  --accent-secondary: #06b6d4;
  --accent-gradient: linear-gradient(135deg, #6366f1 0%, #06b6d4 100%);
  --accent-success: #10b981;
  --accent-warning: #f59e0b;
  --accent-danger: #ef4444;

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4), 0 2px 4px -2px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 10px 25px -3px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 25px rgba(99, 102, 241, 0.15);

  --container-max: 1200px;
  --transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="light"] {
  --bg-body: #f8fafc;
  --bg-surface: #ffffff;
  --bg-card: #ffffff;
  --bg-card-hover: #f1f5f9;
  --bg-input: #f8fafc;
  --border-color: #e2e8f0;
  --border-glow: rgba(99, 102, 241, 0.15);
  
  --text-main: #0f172a;
  --text-muted: #475569;
  --text-dim: #94a3b8;

  --accent-gradient: linear-gradient(135deg, #4f46e5 0%, #0891b2 100%);
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
  --shadow-lg: 0 10px 20px -3px rgba(0, 0, 0, 0.08);
}

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

html {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--text-main);
  background-color: var(--bg-body);
  scroll-behavior: smooth;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a {
  color: var(--accent-secondary);
  text-decoration: none;
  transition: var(--transition);
}
a:hover {
  color: var(--accent-primary);
  text-decoration: underline;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

code, pre {
  font-family: var(--font-mono);
}

/* Container */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: 1.25rem;
  padding-right: 1.25rem;
}

/* Header & Navigation */
.site-header {
  background-color: rgba(17, 24, 39, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 50;
  transition: var(--transition);
}
[data-theme="light"] .site-header {
  background-color: rgba(255, 255, 255, 0.9);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 4.25rem;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--text-main);
  text-decoration: none !important;
}

.brand-icon {
  width: 32px;
  height: 32px;
  background: var(--accent-gradient);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #ffffff;
  font-weight: 900;
  font-size: 1rem;
  box-shadow: 0 0 12px rgba(99, 102, 241, 0.4);
}

.brand-logo span.accent {
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  list-style: none;
}

.nav-link {
  color: var(--text-muted);
  font-size: 0.95rem;
  font-weight: 500;
  padding: 0.5rem 0.75rem;
  border-radius: var(--radius-sm);
  transition: var(--transition);
  text-decoration: none !important;
}
.nav-link:hover, .nav-link.active {
  color: var(--text-main);
  background-color: var(--bg-card);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.theme-btn, .mobile-toggle {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-muted);
  padding: 0.45rem 0.75rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  transition: var(--transition);
}
.theme-btn:hover, .mobile-toggle:hover {
  color: var(--text-main);
  border-color: var(--accent-primary);
}

.mobile-toggle {
  display: none;
}

/* Ad Containers (AdSense Core Web Vitals Ready) */
.ad-container {
  margin: 1.5rem auto;
  text-align: center;
  overflow: hidden;
  min-height: 90px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.ad-mockup {
  background: rgba(30, 41, 59, 0.4);
  border: 1px dashed var(--border-color);
  border-radius: var(--radius-sm);
  padding: 1rem 1.5rem;
  color: var(--text-dim);
  font-size: 0.82rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

/* Hero Section */
.hero-section {
  padding: 5rem 0 3.5rem;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.35rem 0.85rem;
  background: rgba(99, 102, 241, 0.12);
  border: 1px solid rgba(99, 102, 241, 0.3);
  border-radius: 9999px;
  font-size: 0.82rem;
  font-weight: 600;
  color: #a5b4fc;
  margin-bottom: 1.5rem;
}

.hero-title {
  font-size: clamp(2.2rem, 5vw, 3.75rem);
  font-weight: 900;
  line-height: 1.15;
  margin-bottom: 1.25rem;
  letter-spacing: -0.025em;
}

.hero-subtitle {
  font-size: clamp(1.05rem, 2vw, 1.25rem);
  color: var(--text-muted);
  max-width: 720px;
  margin: 0 auto 2.5rem;
  line-height: 1.6;
}

.hero-cta {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  flex-wrap: wrap;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-weight: 600;
  font-size: 0.95rem;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  cursor: pointer;
  transition: var(--transition);
  text-decoration: none !important;
}

.btn-primary {
  background: var(--accent-gradient);
  color: #ffffff;
  box-shadow: 0 4px 14px rgba(99, 102, 241, 0.4);
}
.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 20px rgba(99, 102, 241, 0.6);
  color: #ffffff;
}

.btn-secondary {
  background: var(--bg-card);
  color: var(--text-main);
  border-color: var(--border-color);
}
.btn-secondary:hover {
  background: var(--bg-card-hover);
  border-color: var(--text-dim);
}

.btn-sm {
  padding: 0.4rem 0.85rem;
  font-size: 0.85rem;
}

/* Feature Grid & Cards */
.section-title-wrap {
  text-align: center;
  margin-bottom: 3rem;
}
.section-tag {
  color: var(--accent-secondary);
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
}
.section-title {
  font-size: 2rem;
  font-weight: 800;
  margin-top: 0.35rem;
}

.tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 1.75rem;
  margin-bottom: 4rem;
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 2rem;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
}
.card:hover {
  transform: translateY(-3px);
  border-color: var(--accent-primary);
  box-shadow: var(--shadow-glow);
}

.card-icon {
  width: 48px;
  height: 48px;
  background: rgba(99, 102, 241, 0.12);
  border: 1px solid rgba(99, 102, 241, 0.25);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  margin-bottom: 1.25rem;
  color: var(--accent-secondary);
}

.card-title {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
}

.card-desc {
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.5;
  margin-bottom: 1.5rem;
  flex-grow: 1;
}

/* Pricing Snapshot Table */
.pricing-matrix-wrap {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.75rem;
  margin-bottom: 4rem;
  overflow-x: auto;
}

.tech-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.92rem;
}
.tech-table th {
  background: var(--bg-input);
  color: var(--text-dim);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 0.85rem 1rem;
  border-bottom: 1px solid var(--border-color);
}
.tech-table td {
  padding: 0.95rem 1rem;
  border-bottom: 1px solid var(--border-color);
  color: var(--text-main);
}
.tech-table tr:hover td {
  background: rgba(255, 255, 255, 0.02);
}

/* Interactive Tool Workspaces */
.tool-workspace {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 2.25rem;
  margin: 2rem 0;
  box-shadow: var(--shadow-lg);
}

.workspace-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
}
@media (max-width: 900px) {
  .workspace-grid {
    grid-template-columns: 1fr;
  }
}

.input-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  margin-bottom: 1.25rem;
}

.input-label {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-main);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.form-control, .form-select, .form-textarea {
  width: 100%;
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 0.75rem 1rem;
  font-family: inherit;
  font-size: 0.95rem;
  color: var(--text-main);
  transition: var(--transition);
}
.form-control:focus, .form-select:focus, .form-textarea:focus {
  outline: none;
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.2);
}

.form-textarea {
  font-family: var(--font-mono);
  font-size: 0.88rem;
  resize: vertical;
  min-height: 180px;
}

.stat-pills {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin-top: 0.5rem;
}

.stat-pill {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  padding: 0.35rem 0.75rem;
  border-radius: var(--radius-sm);
  font-size: 0.82rem;
  color: var(--text-muted);
}
.stat-pill strong {
  color: var(--accent-secondary);
}

.metrics-panel {
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.5rem;
}

.metric-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.75rem 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}
.metric-row:last-child {
  border-bottom: none;
}
.metric-val {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--accent-secondary);
}

/* Blog & Article Styles */
.blog-header {
  padding: 3rem 0 2rem;
  text-align: center;
}

.category-filter-bar {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.65rem;
  flex-wrap: wrap;
  margin: 2rem 0;
}

.filter-chip {
  padding: 0.45rem 1rem;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 9999px;
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--text-muted);
  text-decoration: none !important;
  transition: var(--transition);
}
.filter-chip:hover, .filter-chip.active {
  background: var(--accent-primary);
  border-color: var(--accent-primary);
  color: #ffffff;
}

.article-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: var(--transition);
}
.article-card:hover {
  transform: translateY(-3px);
  border-color: var(--accent-primary);
  box-shadow: var(--shadow-glow);
}
.article-card-body {
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.article-badge {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--accent-secondary);
  margin-bottom: 0.75rem;
}

.article-card-title {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
  line-height: 1.4;
}
.article-card-title a {
  color: var(--text-main);
  text-decoration: none;
}
.article-card-title a:hover {
  color: var(--accent-secondary);
}

.article-card-excerpt {
  color: var(--text-muted);
  font-size: 0.92rem;
  line-height: 1.5;
  margin-bottom: 1.25rem;
  flex-grow: 1;
}

.article-meta {
  display: flex;
  align-items: center;
  gap: 1rem;
  font-size: 0.82rem;
  color: var(--text-dim);
  border-top: 1px solid var(--border-color);
  padding-top: 1rem;
}

/* Single Article Post View */
.single-article {
  max-width: 820px;
  margin: 2.5rem auto 5rem;
}

.breadcrumbs {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  color: var(--text-dim);
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
}
.breadcrumbs a {
  color: var(--text-muted);
}
.breadcrumbs span.separator {
  opacity: 0.5;
}

.article-hero-title {
  font-size: clamp(2rem, 4vw, 2.75rem);
  font-weight: 900;
  line-height: 1.2;
  margin-bottom: 1.25rem;
  letter-spacing: -0.02em;
}

.article-author-bar {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding-bottom: 2rem;
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 2.5rem;
}
.author-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--accent-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-weight: 700;
}

.article-content {
  font-size: 1.1rem;
  line-height: 1.8;
  color: #cbd5e1;
}
[data-theme="light"] .article-content {
  color: #334155;
}

.article-content h1, .article-content h2, .article-content h3 {
  color: var(--text-main);
  margin-top: 2.5rem;
  margin-bottom: 1rem;
  font-weight: 800;
  line-height: 1.3;
}
.article-content h2 { font-size: 1.65rem; }
.article-content h3 { font-size: 1.3rem; }

.article-content p {
  margin-bottom: 1.5rem;
}

.article-content code {
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  padding: 0.2rem 0.4rem;
  border-radius: var(--radius-sm);
  font-size: 0.9em;
  color: #38bdf8;
}

.article-content pre.code-block {
  background: #030712;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  overflow-x: auto;
  margin: 1.75rem 0;
}
.article-content pre.code-block code {
  background: transparent;
  border: none;
  padding: 0;
  color: #f1f5f9;
}

.content-quote {
  border-left: 4px solid var(--accent-primary);
  background: var(--bg-card);
  padding: 1rem 1.5rem;
  margin: 1.5rem 0;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-style: italic;
  color: var(--text-muted);
}

.article-list {
  margin: 1.25rem 0 1.5rem 2rem;
}
.article-list li {
  margin-bottom: 0.5rem;
}

/* Technical Guide Section (Inside Tool Pages) */
.tool-guide {
  margin-top: 4rem;
  padding-top: 3rem;
  border-top: 1px solid var(--border-color);
}
.guide-title {
  font-size: 1.85rem;
  font-weight: 800;
  margin-bottom: 1.5rem;
}

/* Link Silo Cards */
.silo-box {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.75rem;
  margin: 2.5rem 0;
}
.silo-box h4 {
  font-size: 1.15rem;
  margin-bottom: 0.75rem;
  color: var(--accent-secondary);
}
.silo-links {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}
.silo-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  padding: 0.4rem 0.85rem;
  border-radius: var(--radius-sm);
  font-size: 0.88rem;
  color: var(--text-muted);
}
.silo-link:hover {
  border-color: var(--accent-primary);
  color: var(--text-main);
  text-decoration: none;
}

/* Footer */
.site-footer {
  background: var(--bg-surface);
  border-top: 1px solid var(--border-color);
  margin-top: auto;
  padding: 4rem 0 2rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 3rem;
  margin-bottom: 3rem;
}
@media (max-width: 900px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}
@media (max-width: 600px) {
  .footer-grid {
    grid-template-columns: 1fr;
  }
}

.footer-col-title {
  font-size: 0.95rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-main);
  margin-bottom: 1.25rem;
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
}
.footer-links a {
  color: var(--text-muted);
  font-size: 0.9rem;
  text-decoration: none;
}
.footer-links a:hover {
  color: var(--accent-secondary);
}

.footer-bottom {
  border-top: 1px solid var(--border-color);
  padding-top: 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.85rem;
  color: var(--text-dim);
  flex-wrap: wrap;
  gap: 1rem;
}

.footer-legal {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}
.footer-credit {
  font-size: 0.8rem;
  color: var(--text-dim);
}
.footer-credit a {
  color: var(--text-muted);
  font-weight: 600;
  text-decoration: none;
  transition: color 0.2s ease;
}
.footer-credit a:hover {
  color: var(--accent-secondary);
}

/* Toast Notifications */
.toast-container {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  z-index: 9999;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}
.toast {
  background: var(--bg-card);
  border: 1px solid var(--accent-primary);
  color: #fff;
  padding: 0.85rem 1.25rem;
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-lg);
  font-size: 0.9rem;
  animation: toastIn 0.25s ease-out;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
@keyframes toastIn {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Mobile Responsive */
@media (max-width: 768px) {
  .nav-menu {
    display: none;
    position: absolute;
    top: 4.25rem;
    left: 0;
    width: 100%;
    background: var(--bg-surface);
    border-bottom: 1px solid var(--border-color);
    flex-direction: column;
    padding: 1.5rem;
    box-shadow: var(--shadow-lg);
  }
  .nav-menu.open {
    display: flex;
  }
  .mobile-toggle {
    display: flex;
  }
}