/* ============================================
   Simple Digital — Main Stylesheet
   A clean, professional blog template
   ============================================ */

/* ---------- Google Font Import ---------- */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&display=swap');

/* ---------- CSS Custom Properties (Design Tokens) ---------- */
:root {
  /* Primary palette — calm, professional blues */
  --color-primary: #2563eb;
  --color-primary-dark: #1d4ed8;
  --color-primary-light: #dbeafe;

  /* Accent — warm amber for CTAs */
  --color-accent: #f59e0b;
  --color-accent-dark: #d97706;

  /* Neutrals */
  --color-bg: #f8fafc;
  --color-surface: #ffffff;
  --color-border: #e2e8f0;
  --color-text: #1e293b;
  --color-text-secondary: #64748b;
  --color-text-light: #94a3b8;

  /* Category colors */
  --color-cat-seo: #2563eb;
  --color-cat-design: #7c3aed;
  --color-cat-local: #059669;

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.07), 0 2px 4px rgba(0, 0, 0, 0.04);
  --shadow-lg: 0 10px 30px rgba(0, 0, 0, 0.08), 0 4px 8px rgba(0, 0, 0, 0.04);

  /* Typography */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 2rem;
  --font-size-4xl: 2.5rem;
  --font-size-5xl: 3.25rem;

  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  --space-4xl: 6rem;

  /* Layout */
  --max-width: 1140px;
  --border-radius: 10px;
  --border-radius-lg: 16px;

  /* Transitions */
  --transition-fast: 0.2s ease;
  --transition-base: 0.3s ease;
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: 1.7;
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

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

ul,
ol {
  list-style: none;
}

/* ---------- Utility ---------- */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ============================================
   HEADER & NAVIGATION
   ============================================ */
.site-header {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 1000;
  backdrop-filter: blur(12px);
  background: rgba(255, 255, 255, 0.92);
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

/* Brand logo / name */
.brand {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-weight: 800;
  font-size: var(--font-size-xl);
  color: var(--color-text);
  text-decoration: none;
  letter-spacing: -0.02em;
}

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

.brand-icon {
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, var(--color-primary), #6366f1);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: var(--font-size-lg);
  font-weight: 800;
  flex-shrink: 0;
}

/* Desktop navigation */
.nav-links {
  display: flex;
  gap: var(--space-xl);
  align-items: center;
}

.nav-links a {
  color: var(--color-text-secondary);
  font-weight: 500;
  font-size: var(--font-size-sm);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  padding: var(--space-xs) 0;
  position: relative;
  transition: color var(--transition-fast);
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-primary);
  border-radius: 2px;
  transition: width var(--transition-base);
}

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

.nav-links a:hover::after,
.nav-links a.active::after {
  width: 100%;
}

/* Mobile hamburger button */
.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-sm);
  flex-direction: column;
  gap: 5px;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2.5px;
  background: var(--color-text);
  border-radius: 2px;
  transition: var(--transition-base);
  transform-origin: center;
}

/* Hamburger animation when open */
.nav-toggle.open span:nth-child(1) {
  transform: translateY(7.5px) rotate(45deg);
}

.nav-toggle.open span:nth-child(2) {
  opacity: 0;
}

.nav-toggle.open span:nth-child(3) {
  transform: translateY(-7.5px) rotate(-45deg);
}

/* ============================================
   HERO SECTION
   ============================================ */
.hero {
  padding: var(--space-4xl) 0;
  background: linear-gradient(160deg, #eff6ff 0%, #f0f4ff 40%, #f8fafc 100%);
  position: relative;
  overflow: hidden;
}

/* Subtle decorative circles */
.hero::before,
.hero::after {
  content: '';
  position: absolute;
  border-radius: 50%;
  opacity: 0.12;
  pointer-events: none;
}

.hero::before {
  width: 500px;
  height: 500px;
  background: var(--color-primary);
  top: -200px;
  right: -100px;
}

.hero::after {
  width: 300px;
  height: 300px;
  background: #6366f1;
  bottom: -120px;
  left: -80px;
}

.hero .container {
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: 780px;
}

.hero-label {
  display: inline-block;
  background: var(--color-primary-light);
  color: var(--color-primary);
  font-size: var(--font-size-sm);
  font-weight: 600;
  padding: var(--space-xs) var(--space-md);
  border-radius: 50px;
  margin-bottom: var(--space-lg);
  letter-spacing: 0.02em;
}

/* SEO: The page heading (H1) is inside the hero */
.hero h1 {
  font-size: var(--font-size-5xl);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.03em;
  color: var(--color-text);
  margin-bottom: var(--space-lg);
}

.hero p {
  font-size: var(--font-size-lg);
  color: var(--color-text-secondary);
  max-width: 600px;
  margin: 0 auto var(--space-xl);
  line-height: 1.8;
}

.hero-actions {
  display: flex;
  justify-content: center;
  gap: var(--space-md);
  flex-wrap: wrap;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 14px 32px;
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  font-weight: 600;
  border: none;
  border-radius: var(--border-radius);
  cursor: pointer;
  transition: all var(--transition-base);
  text-decoration: none;
}

.btn-primary {
  background: var(--color-primary);
  color: #ffffff;
  box-shadow: 0 4px 14px rgba(37, 99, 235, 0.3);
}

.btn-primary:hover {
  background: var(--color-primary-dark);
  color: #ffffff;
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(37, 99, 235, 0.35);
}

.btn-outline {
  background: transparent;
  color: var(--color-primary);
  border: 2px solid var(--color-primary);
}

.btn-outline:hover {
  background: var(--color-primary);
  color: #ffffff;
  transform: translateY(-2px);
}

.btn-secondary {
  background: var(--color-text);
  color: #ffffff;
}

.btn-secondary:hover {
  background: #0f172a;
  color: #ffffff;
  transform: translateY(-2px);
}

/* ============================================
   SECTIONS — General
   ============================================ */
.section {
  padding: var(--space-4xl) 0;
}

.section-header {
  text-align: center;
  margin-bottom: var(--space-3xl);
}

.section-header h2 {
  font-size: var(--font-size-3xl);
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-sm);
}

.section-header p {
  font-size: var(--font-size-lg);
  color: var(--color-text-secondary);
  max-width: 560px;
  margin: 0 auto;
}

/* ============================================
   BLOG CARDS (used on Home & Blog pages)
   ============================================ */
.card-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-xl);
}

.card {
  background: var(--color-surface);
  border-radius: var(--border-radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border);
  transition: transform var(--transition-base), box-shadow var(--transition-base);
  display: flex;
  flex-direction: column;
}

.card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
}

/* Visual placeholder for card thumbnails */
.card-image {
  height: 200px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 3rem;
  position: relative;
  overflow: hidden;
}

.card-image::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 50%, rgba(0, 0, 0, 0.04) 100%);
}

.card-image.seo-basics {
  background: linear-gradient(135deg, #dbeafe, #bfdbfe);
}

.card-image.web-design {
  background: linear-gradient(135deg, #ede9fe, #ddd6fe);
}

.card-image.local-seo {
  background: linear-gradient(135deg, #d1fae5, #a7f3d0);
}

.card-body {
  padding: var(--space-lg);
  display: flex;
  flex-direction: column;
  flex: 1;
}

.card-category {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 3px 10px;
  border-radius: 50px;
  margin-bottom: var(--space-sm);
  width: fit-content;
}

.card-category.seo-basics {
  background: #dbeafe;
  color: var(--color-cat-seo);
}

.card-category.web-design {
  background: #ede9fe;
  color: var(--color-cat-design);
}

.card-category.local-seo {
  background: #d1fae5;
  color: var(--color-cat-local);
}

.card-body h3 {
  font-size: var(--font-size-xl);
  font-weight: 700;
  line-height: 1.35;
  margin-bottom: var(--space-sm);
  letter-spacing: -0.01em;
}

.card-body h3 a {
  color: var(--color-text);
  text-decoration: none;
}

.card-body h3 a:hover {
  color: var(--color-primary);
}

.card-body p {
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
  line-height: 1.7;
  flex: 1;
}

.card-footer {
  padding: 0 var(--space-lg) var(--space-lg);
}

.card-link {
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--color-primary);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: gap var(--transition-base), color var(--transition-fast);
}

.card-link:hover {
  gap: 10px;
  color: var(--color-primary-dark);
}

.card-link::after {
  content: '→';
}

/* ============================================
   BLOG POST PAGE
   ============================================ */
.post-page {
  padding: var(--space-3xl) 0 var(--space-4xl);
}

.post-container {
  max-width: 760px;
  margin: 0 auto;
}

.post-meta {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  margin-bottom: var(--space-lg);
  flex-wrap: wrap;
}

.post-meta .date {
  font-size: var(--font-size-sm);
  color: var(--color-text-light);
}

.post-meta .read-time {
  font-size: var(--font-size-sm);
  color: var(--color-text-light);
}

.post-container h1 {
  font-size: var(--font-size-4xl);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-xl);
}

.post-container h2 {
  font-size: var(--font-size-2xl);
  font-weight: 700;
  margin-top: var(--space-2xl);
  margin-bottom: var(--space-md);
  letter-spacing: -0.01em;
  color: var(--color-text);
}

.post-container p {
  margin-bottom: var(--space-lg);
  color: var(--color-text-secondary);
  font-size: var(--font-size-lg);
  line-height: 1.85;
}

.post-container ul,
.post-container ol {
  margin-bottom: var(--space-lg);
  padding-left: var(--space-xl);
  color: var(--color-text-secondary);
  font-size: var(--font-size-lg);
  line-height: 1.85;
}

.post-container ul {
  list-style: disc;
}

.post-container ol {
  list-style: decimal;
}

.post-container li {
  margin-bottom: var(--space-sm);
}

.post-container a {
  color: var(--color-primary);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.post-container a:hover {
  color: var(--color-primary-dark);
}

.post-nav {
  margin-top: var(--space-3xl);
  padding-top: var(--space-xl);
  border-top: 1px solid var(--color-border);
}

/* ============================================
   PAGE HEADER (Blog listing, About, Contact)
   ============================================ */
.page-header {
  padding: var(--space-3xl) 0 var(--space-xl);
  background: linear-gradient(160deg, #eff6ff 0%, #f8fafc 100%);
  text-align: center;
}

.page-header h1 {
  font-size: var(--font-size-4xl);
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-md);
}

.page-header p {
  font-size: var(--font-size-lg);
  color: var(--color-text-secondary);
  max-width: 560px;
  margin: 0 auto;
  line-height: 1.8;
}

/* ============================================
   ABOUT PAGE
   ============================================ */
.about-content {
  max-width: 760px;
  margin: 0 auto;
  padding: var(--space-3xl) var(--space-lg);
}

.about-content h2 {
  font-size: var(--font-size-2xl);
  font-weight: 700;
  margin-top: var(--space-2xl);
  margin-bottom: var(--space-md);
  letter-spacing: -0.01em;
}

.about-content p {
  color: var(--color-text-secondary);
  font-size: var(--font-size-lg);
  line-height: 1.85;
  margin-bottom: var(--space-lg);
}

.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: var(--space-md);
  margin-top: var(--space-lg);
}

.skill-item {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  padding: var(--space-lg);
  text-align: center;
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.skill-item:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.skill-icon {
  font-size: 2rem;
  margin-bottom: var(--space-sm);
}

.skill-item h3 {
  font-size: var(--font-size-base);
  font-weight: 600;
  margin-bottom: var(--space-xs);
}

.skill-item p {
  font-size: var(--font-size-sm);
  color: var(--color-text-light);
  margin-bottom: 0;
}

/* ============================================
   CONTACT FORM
   ============================================ */
.contact-section {
  max-width: 620px;
  margin: 0 auto;
  padding: var(--space-3xl) var(--space-lg);
}

.form-group {
  margin-bottom: var(--space-lg);
}

.form-group label {
  display: block;
  font-weight: 600;
  font-size: var(--font-size-sm);
  color: var(--color-text);
  margin-bottom: var(--space-sm);
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 14px 16px;
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  color: var(--color-text);
  background: var(--color-surface);
  border: 2px solid var(--color-border);
  border-radius: var(--border-radius);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
  outline: none;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.1);
}

.form-group input.error,
.form-group textarea.error {
  border-color: #ef4444;
  box-shadow: 0 0 0 4px rgba(239, 68, 68, 0.1);
}

.form-group textarea {
  min-height: 160px;
  resize: vertical;
}

.form-error {
  color: #ef4444;
  font-size: var(--font-size-sm);
  margin-top: var(--space-xs);
  display: none;
}

.form-error.visible {
  display: block;
}

.form-success {
  background: #d1fae5;
  color: #065f46;
  padding: var(--space-lg);
  border-radius: var(--border-radius);
  text-align: center;
  font-weight: 600;
  display: none;
  animation: fadeIn 0.4s ease;
}

.form-success.visible {
  display: block;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(-8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ============================================
   FOOTER
   ============================================ */
.site-footer {
  background: var(--color-text);
  color: #cbd5e1;
  padding: var(--space-3xl) 0 var(--space-xl);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: var(--space-2xl);
  margin-bottom: var(--space-2xl);
}

.footer-brand {
  font-size: var(--font-size-xl);
  font-weight: 800;
  color: #ffffff;
  margin-bottom: var(--space-sm);
}

.footer-desc {
  font-size: var(--font-size-sm);
  line-height: 1.7;
  color: #94a3b8;
  max-width: 320px;
}

.footer-heading {
  font-size: var(--font-size-sm);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: #ffffff;
  margin-bottom: var(--space-md);
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

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

.footer-links a:hover {
  color: #ffffff;
}

.footer-bottom {
  border-top: 1px solid #334155;
  padding-top: var(--space-lg);
  text-align: center;
  font-size: var(--font-size-sm);
  color: #64748b;
}

/* ============================================
   RESPONSIVE — Tablet (max 900px)
   ============================================ */
@media (max-width: 900px) {
  .card-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }

  .hero h1 {
    font-size: var(--font-size-4xl);
  }
}

/* ============================================
   RESPONSIVE — Mobile (max 640px)
   ============================================ */
@media (max-width: 640px) {
  /* Show hamburger, hide links */
  .nav-toggle {
    display: flex;
  }

  .nav-links {
    display: none;
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    flex-direction: column;
    padding: var(--space-lg);
    gap: var(--space-md);
    box-shadow: var(--shadow-md);
  }

  .nav-links.open {
    display: flex;
  }

  .nav-links a {
    font-size: var(--font-size-base);
    padding: var(--space-sm) 0;
  }

  /* Hero */
  .hero {
    padding: var(--space-2xl) 0;
  }

  .hero h1 {
    font-size: var(--font-size-3xl);
  }

  .hero p {
    font-size: var(--font-size-base);
  }

  /* Cards */
  .card-grid {
    grid-template-columns: 1fr;
  }

  /* Section */
  .section {
    padding: var(--space-2xl) 0;
  }

  .section-header h2 {
    font-size: var(--font-size-2xl);
  }

  /* Page header */
  .page-header h1 {
    font-size: var(--font-size-3xl);
  }

  /* Post */
  .post-container h1 {
    font-size: var(--font-size-2xl);
  }

  .post-container h2 {
    font-size: var(--font-size-xl);
  }

  .post-container p,
  .post-container li {
    font-size: var(--font-size-base);
  }

  /* Footer */
  .footer-grid {
    grid-template-columns: 1fr;
    gap: var(--space-xl);
  }

  /* Buttons */
  .btn {
    padding: 12px 24px;
    font-size: var(--font-size-sm);
  }

  .hero-actions {
    width: 100%;
  }
}