/* ==========================================================================
   SolopreneurToolkit - Core Design System & Global Stylesheet
   Modern, ultra-fast, mobile-first responsive design.
   Zero external dependencies. 100% accessible.
   ========================================================================== */

:root {
  /* Color Palette */
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --primary-light: #eff6ff;
  --primary-glow: rgba(37, 99, 235, 0.15);

  --secondary: #0f172a;
  --secondary-light: #1e293b;

  --accent-emerald: #059669;
  --accent-emerald-light: #ecfdf5;
  --accent-amber: #d97706;
  --accent-amber-light: #fffbeb;
  --accent-purple: #7c3aed;
  --accent-purple-light: #f5f3ff;
  --accent-rose: #e11d48;
  --accent-rose-light: #fff1f2;

  /* Neutrals */
  --bg-body: #f8fafc;
  --bg-surface: #ffffff;
  --bg-surface-elevated: #ffffff;
  --bg-subtle: #f1f5f9;
  --border-color: #e2e8f0;
  --border-focus: #3b82f6;

  /* Typography */
  --text-main: #0f172a;
  --text-muted: #475569;
  --text-subtle: #64748b;
  --text-white: #ffffff;

  /* Layout & Spacing */
  --container-max: 1200px;
  --container-pad: 1.5rem;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-full: 9999px;

  /* Elevation */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.08), 0 2px 4px -1px rgba(0, 0, 0, 0.04);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -2px rgba(0, 0, 0, 0.03);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-normal: 250ms ease;
  --font-stack: -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;
}

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

html {
  font-family: var(--font-stack);
  font-size: 16px;
  line-height: 1.5;
  color: var(--text-main);
  background-color: var(--bg-body);
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
}

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

img, svg {
  display: block;
  max-width: 100%;
}

a {
  color: var(--primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--primary-hover);
}

button, input, select, textarea {
  font: inherit;
  color: inherit;
}

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

/* ==========================================================================
   Header & Navigation
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border-color);
  transition: box-shadow var(--transition-fast);
}

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

.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-weight: 800;
  font-size: 1.25rem;
  color: var(--secondary);
  letter-spacing: -0.025em;
  text-decoration: none;
}

.brand-icon {
  width: 2.25rem;
  height: 2.25rem;
  background: linear-gradient(135deg, #2563eb, #10b981);
  color: white;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  box-shadow: 0 2px 8px rgba(37, 99, 235, 0.3);
}

.brand-tag {
  font-size: 0.75rem;
  font-weight: 600;
  background: var(--accent-emerald-light);
  color: var(--accent-emerald);
  padding: 0.15rem 0.5rem;
  border-radius: var(--radius-full);
  margin-left: 0.25rem;
}

.nav-desktop {
  display: none;
  align-items: center;
  gap: 1.75rem;
}

@media (min-width: 900px) {
  .nav-desktop {
    display: flex;
  }
}

.nav-link {
  font-weight: 500;
  font-size: 0.95rem;
  color: var(--text-muted);
  transition: color var(--transition-fast);
  padding: 0.5rem 0;
  position: relative;
}

.nav-link:hover, .nav-link.active {
  color: var(--primary);
}

.nav-link.active::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--primary);
  border-radius: 2px;
}

.header-cta-group {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.btn-header-cta {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  background: var(--primary);
  color: white !important;
  font-weight: 600;
  font-size: 0.875rem;
  padding: 0.55rem 1rem;
  border-radius: var(--radius-md);
  transition: background-color var(--transition-fast), transform var(--transition-fast);
}

.btn-header-cta:hover {
  background: var(--primary-hover);
  transform: translateY(-1px);
}

.mobile-menu-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.5rem;
  height: 2.5rem;
  background: transparent;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: var(--text-main);
  cursor: pointer;
}

@media (min-width: 900px) {
  .mobile-menu-btn {
    display: none;
  }
}

/* Mobile Drawer */
.mobile-nav-drawer {
  position: fixed;
  top: 4.25rem;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(15, 23, 42, 0.4);
  backdrop-filter: blur(4px);
  z-index: 999;
  display: none;
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.mobile-nav-drawer.open {
  display: block;
  opacity: 1;
}

.mobile-nav-content {
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border-color);
  padding: 1.5rem var(--container-pad);
  max-height: calc(100vh - 4.25rem);
  overflow-y: auto;
  box-shadow: var(--shadow-lg);
}

.mobile-nav-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.mobile-nav-link {
  display: block;
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-main);
  padding: 0.5rem 0;
  border-bottom: 1px solid var(--bg-subtle);
}

/* ==========================================================================
   Hero Section
   ========================================================================== */
.hero {
  padding: 3.5rem 0 2.5rem;
  background: radial-gradient(circle at 50% 0%, rgba(37, 99, 235, 0.08) 0%, transparent 60%);
  text-align: center;
  border-bottom: 1px solid var(--border-color);
}

.hero-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--primary-light);
  color: var(--primary);
  font-size: 0.85rem;
  font-weight: 600;
  padding: 0.35rem 0.9rem;
  border-radius: var(--radius-full);
  margin-bottom: 1.25rem;
  border: 1px solid rgba(37, 99, 235, 0.2);
}

.hero-title {
  font-size: clamp(2rem, 5vw, 3.25rem);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.03em;
  color: var(--secondary);
  max-width: 860px;
  margin: 0 auto 1.25rem;
}

.hero-title span {
  background: linear-gradient(135deg, #2563eb 0%, #059669 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: clamp(1.05rem, 2vw, 1.25rem);
  color: var(--text-muted);
  max-width: 680px;
  margin: 0 auto 2rem;
  line-height: 1.6;
}

.hero-search-wrapper {
  max-width: 580px;
  margin: 0 auto 1.5rem;
  position: relative;
}

.hero-search-input {
  width: 100%;
  padding: 0.95rem 1rem 0.95rem 3rem;
  font-size: 1.05rem;
  border: 2px solid var(--border-color);
  border-radius: var(--radius-lg);
  background: var(--bg-surface);
  box-shadow: var(--shadow-md);
  outline: none;
  transition: all var(--transition-fast);
}

.hero-search-input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 4px var(--primary-glow);
}

.search-icon-svg {
  position: absolute;
  left: 1rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-subtle);
  pointer-events: none;
}

.hero-badges {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 1.5rem;
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 1.25rem;
}

.hero-badge-item {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}

.hero-badge-item svg {
  color: var(--accent-emerald);
}

/* ==========================================================================
   Tool Cards Grid & Catalog
   ========================================================================== */
.section-tools {
  padding: 3rem 0;
}

.section-header {
  margin-bottom: 2rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

@media (min-width: 768px) {
  .section-header {
    flex-direction: row;
    align-items: flex-end;
    justify-content: space-between;
  }
}

.section-title {
  font-size: 1.75rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--secondary);
}

.section-desc {
  font-size: 0.95rem;
  color: var(--text-muted);
}

.category-filter-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 1rem;
}

.pill-filter {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  color: var(--text-muted);
  font-size: 0.85rem;
  font-weight: 600;
  padding: 0.45rem 1rem;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.pill-filter:hover {
  border-color: var(--primary);
  color: var(--primary);
}

.pill-filter.active {
  background: var(--secondary);
  border-color: var(--secondary);
  color: white;
}

.tools-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}

@media (min-width: 640px) {
  .tools-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .tools-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.tool-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), border-color var(--transition-fast);
  text-decoration: none;
  color: inherit;
}

.tool-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: #cbd5e1;
}

.tool-badge-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.25rem;
}

.tool-icon-box {
  width: 3rem;
  height: 3rem;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  flex-shrink: 0;
}

.icon-blue { background: #dbeafe; color: #1d4ed8; }
.icon-emerald { background: #d1fae5; color: #047857; }
.icon-purple { background: #ede9fe; color: #6d28d9; }
.icon-amber { background: #fef3c7; color: #b45309; }
.icon-rose { background: #ffe4e6; color: #be123c; }
.icon-indigo { background: #e0e7ff; color: #4338ca; }

.tool-category-badge {
  font-size: 0.725rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 0.25rem 0.6rem;
  border-radius: var(--radius-sm);
  background: var(--bg-subtle);
  color: var(--text-subtle);
}

.tool-card-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--secondary);
  line-height: 1.3;
  margin-bottom: 0.6rem;
  transition: color var(--transition-fast);
}

.tool-card:hover .tool-card-title {
  color: var(--primary);
}

.tool-card-desc {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.55;
  margin-bottom: 1.5rem;
  flex-grow: 1;
}

.tool-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--primary);
  border-top: 1px solid var(--border-color);
  padding-top: 1rem;
}

.tool-card-arrow {
  transition: transform var(--transition-fast);
}

.tool-card:hover .tool-card-arrow {
  transform: translateX(4px);
}

/* ==========================================================================
   Monetization Placeholders (AdSense & Affiliates)
   ========================================================================== */
.ad-slot-container {
  margin: 2rem 0;
  padding: 1rem;
  background: var(--bg-subtle);
  border: 1px dashed #cbd5e1;
  border-radius: var(--radius-md);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.ad-label {
  display: block;
  font-size: 0.675rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-subtle);
  margin-bottom: 0.5rem;
  font-weight: 600;
}

.ad-placeholder-box {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  padding: 1rem;
  margin: 0 auto;
  min-height: 90px;
  max-width: 728px;
  color: var(--text-subtle);
  font-size: 0.85rem;
}

.ad-placeholder-box.banner-728 {
  min-height: 90px;
}

.ad-placeholder-box.sidebar-300 {
  max-width: 300px;
  min-height: 250px;
}

/* Affiliate Recommendation Callout Box */
.affiliate-recommendation-card {
  background: linear-gradient(145deg, #ffffff, #f8fafc);
  border: 1.5px solid #cbd5e1;
  border-left: 4px solid var(--primary);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  margin: 2rem 0;
  box-shadow: var(--shadow-sm);
}

.affiliate-badge-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.75rem;
}

.affiliate-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  background: var(--accent-amber-light);
  color: #92400e;
  padding: 0.2rem 0.55rem;
  border-radius: var(--radius-sm);
}

.affiliate-disclosure-mini {
  font-size: 0.75rem;
  color: var(--text-subtle);
}

.affiliate-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--secondary);
  margin-bottom: 0.5rem;
}

.affiliate-desc {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.5;
  margin-bottom: 1rem;
}

.affiliate-perks-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  margin-bottom: 1.25rem;
}

.affiliate-perks-list li {
  font-size: 0.875rem;
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.affiliate-perks-list svg {
  color: var(--accent-emerald);
  flex-shrink: 0;
}

.affiliate-cta-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--secondary);
  color: white !important;
  font-size: 0.9rem;
  font-weight: 600;
  padding: 0.65rem 1.25rem;
  border-radius: var(--radius-md);
  transition: background var(--transition-fast), transform var(--transition-fast);
}

.affiliate-cta-btn:hover {
  background: var(--primary);
  transform: translateY(-1px);
}

/* ==========================================================================
   Editorial & Informational Blocks (Homepage & Static Pages)
   ========================================================================== */
.feature-grid-section {
  padding: 3.5rem 0;
  background: var(--bg-surface);
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
}

.feature-columns {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}

@media (min-width: 768px) {
  .feature-columns {
    grid-template-columns: repeat(3, 1fr);
  }
}

.feature-col {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.feature-col-icon {
  width: 2.75rem;
  height: 2.75rem;
  border-radius: var(--radius-md);
  background: var(--primary-light);
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
}

.feature-col-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--secondary);
}

.feature-col-text {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* Breadcrumbs */
.breadcrumbs {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
  font-size: 0.85rem;
  color: var(--text-subtle);
  padding: 1.25rem 0 0.5rem;
}

.breadcrumbs a {
  color: var(--text-muted);
}

.breadcrumbs a:hover {
  color: var(--primary);
}

.breadcrumbs span.separator {
  color: #94a3b8;
}

/* Content Article Pages (Privacy, Terms, About, Disclosure) */
.page-article {
  padding: 3rem 0 5rem;
}

.article-header {
  margin-bottom: 2.5rem;
  max-width: 800px;
}

.article-title {
  font-size: clamp(2rem, 4vw, 2.75rem);
  font-weight: 800;
  letter-spacing: -0.025em;
  color: var(--secondary);
  line-height: 1.2;
  margin-bottom: 0.75rem;
}

.article-meta {
  font-size: 0.9rem;
  color: var(--text-subtle);
}

.article-body {
  max-width: 800px;
  font-size: 1.05rem;
  line-height: 1.7;
  color: #334155;
}

.article-body h2 {
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--secondary);
  margin: 2.5rem 0 1rem;
  letter-spacing: -0.02em;
}

.article-body h3 {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--secondary);
  margin: 1.75rem 0 0.75rem;
}

.article-body p {
  margin-bottom: 1.25rem;
}

.article-body ul, .article-body ol {
  margin-bottom: 1.5rem;
  padding-left: 1.5rem;
}

.article-body li {
  margin-bottom: 0.5rem;
}

.article-body blockquote {
  border-left: 4px solid var(--primary);
  background: var(--bg-surface);
  padding: 1rem 1.25rem;
  margin: 1.5rem 0;
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  font-style: italic;
  color: var(--text-muted);
}

/* Contact Form */
.contact-form-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 2rem;
  box-shadow: var(--shadow-sm);
  max-width: 650px;
  margin-bottom: 3rem;
}

.form-group {
  margin-bottom: 1.25rem;
}

.form-label {
  display: block;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--secondary);
  margin-bottom: 0.4rem;
}

.form-input, .form-textarea, .form-select {
  width: 100%;
  padding: 0.75rem 1rem;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  background: var(--bg-body);
  font-size: 0.95rem;
  outline: none;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-input:focus, .form-textarea:focus, .form-select:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-glow);
  background: var(--bg-surface);
}

.form-btn-submit {
  background: var(--primary);
  color: white;
  border: none;
  font-weight: 600;
  font-size: 1rem;
  padding: 0.85rem 1.75rem;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: background var(--transition-fast);
}

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

/* ==========================================================================
   Footer
   ========================================================================== */
.site-footer {
  margin-top: auto;
  background: var(--secondary);
  color: #cbd5e1;
  padding: 4rem 0 2rem;
  border-top: 1px solid #334155;
  font-size: 0.925rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.5rem;
  margin-bottom: 3rem;
}

@media (min-width: 640px) {
  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .footer-grid {
    grid-template-columns: 2fr 1fr 1fr 1fr;
  }
}

.footer-brand-col {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.footer-brand {
  font-size: 1.25rem;
  font-weight: 800;
  color: white;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.footer-brand-desc {
  font-size: 0.9rem;
  color: #94a3b8;
  line-height: 1.6;
  max-width: 320px;
}

.footer-heading {
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: white;
  margin-bottom: 1.25rem;
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
}

.footer-links a {
  color: #94a3b8;
  transition: color var(--transition-fast);
}

.footer-links a:hover {
  color: white;
}

.footer-legal-notice {
  font-size: 0.8rem;
  color: #64748b;
  line-height: 1.5;
  border-top: 1px solid #1e293b;
  padding-top: 1.5rem;
  margin-bottom: 1.5rem;
}

.footer-bottom {
  border-top: 1px solid #1e293b;
  padding-top: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  align-items: center;
  justify-content: space-between;
  font-size: 0.85rem;
  color: #64748b;
}

@media (min-width: 768px) {
  .footer-bottom {
    flex-direction: row;
  }
}

.footer-badges {
  display: flex;
  gap: 1rem;
}

/* Toast Notifications */
.toast-notice {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  background: var(--secondary);
  color: white;
  padding: 0.75rem 1.25rem;
  border-radius: var(--radius-md);
  font-size: 0.9rem;
  font-weight: 500;
  box-shadow: var(--shadow-xl);
  display: flex;
  align-items: center;
  gap: 0.5rem;
  z-index: 9999;
  opacity: 0;
  transform: translateY(10px);
  transition: opacity var(--transition-fast), transform var(--transition-fast);
  pointer-events: none;
}

.toast-notice.show {
  opacity: 1;
  transform: translateY(0);
}