/* ==========================================================================
   Mailissues.com — Design System
   ========================================================================== */

/* Design Tokens */
:root {
  /* Color ramps */
  --blue-50:  #eff6ff;
  --blue-100: #dbeafe;
  --blue-200: #bfdbfe;
  --blue-400: #60a5fa;
  --blue-500: #3b82f6;
  --blue-600: #2563eb;
  --blue-700: #1d4ed8;
  --blue-900: #1e3a5f;

  --teal-50:  #f0fdfa;
  --teal-100: #ccfbf1;
  --teal-400: #2dd4bf;
  --teal-500: #14b8a6;
  --teal-600: #0d9488;
  --teal-700: #0f766e;

  --amber-50:  #fffbeb;
  --amber-100: #fef3c7;
  --amber-400: #fbbf24;
  --amber-500: #f59e0b;
  --amber-600: #d97706;
  --amber-700: #b45309;

  --green-50:  #f0fdf4;
  --green-100: #dcfce7;
  --green-400: #4ade80;
  --green-500: #22c55e;
  --green-600: #16a34a;
  --green-700: #15803d;

  --coral-50:  #fff5f3;
  --coral-100: #ffe4de;
  --coral-400: #ff8a73;
  --coral-500: #ff6b50;
  --coral-600: #e54a32;

  --violet-50:  #f5f3ff;
  --violet-100: #ede9fe;
  --violet-400: #a78bfa;
  --violet-500: #8b5cf6;
  --violet-600: #7c3aed;

  /* Neutrals */
  --white:    #ffffff;
  --gray-50:  #f9fafb;
  --gray-100: #f3f4f6;
  --gray-200: #e5e7eb;
  --gray-300: #d1d5db;
  --gray-400: #9ca3af;
  --gray-500: #6b7280;
  --gray-600: #4b5563;
  --gray-700: #374151;
  --gray-800: #1f2937;
  --gray-900: #111827;
  --gray-950: #030712;

  /* Semantic */
  --bg:          var(--white);
  --bg-alt:      var(--gray-50);
  --text:        var(--gray-800);
  --text-muted:  var(--gray-500);
  --text-light:  var(--gray-400);
  --border:      var(--gray-200);
  --primary:     var(--blue-600);
  --primary-dark: var(--blue-700);

  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', 'SF Mono', Consolas, monospace;

  /* Spacing (8px base) */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;

  /* Radius */
  --radius-sm: 6px;
  --radius:    10px;
  --radius-lg: 16px;
  --radius-xl: 24px;

  /* Shadows */
  --shadow-sm:  0 1px 2px rgba(0,0,0,0.04);
  --shadow:     0 4px 12px rgba(0,0,0,0.06);
  --shadow-md:  0 8px 24px rgba(0,0,0,0.08);
  --shadow-lg:  0 16px 48px rgba(0,0,0,0.10);

  /* Layout */
  --container: 1140px;
  --header-h:  68px;
}

/* Reset */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
img, svg { display: block; max-width: 100%; }
a { color: var(--primary); text-decoration: none; transition: color .2s; }
a:hover { color: var(--primary-dark); }
button { font-family: inherit; cursor: pointer; border: none; background: none; }
input, textarea, select { font-family: inherit; font-size: inherit; }

/* Container */
.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

/* ==========================================================================
   Header
   ========================================================================== */
.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--header-h);
  background: rgba(255,255,255,0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  z-index: 100;
  transition: border-color .3s, box-shadow .3s;
}
.site-header.scrolled {
  border-color: var(--border);
  box-shadow: var(--shadow-sm);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

/* Logo */
.logo {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  color: var(--gray-900);
  font-weight: 800;
  font-size: 1.25rem;
  letter-spacing: -0.02em;
}
.logo:hover { color: var(--gray-900); }
.logo-mark {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px; height: 36px;
  border-radius: var(--radius-sm);
  background: linear-gradient(135deg, var(--blue-600), var(--teal-500));
  color: var(--white);
}
.logo-mark svg { width: 20px; height: 20px; }
.logo-dot { color: var(--blue-500); }

/* Nav */
.main-nav {
  display: flex;
  align-items: center;
  gap: var(--space-8);
}
.nav-link {
  color: var(--gray-600);
  font-weight: 500;
  font-size: 0.95rem;
  position: relative;
  padding: var(--space-2) 0;
  transition: color .2s;
}
.nav-link:hover { color: var(--gray-900); }
.nav-link.active { color: var(--gray-900); }
.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: -2px; left: 0; right: 0;
  height: 2px;
  background: var(--blue-500);
  border-radius: 1px;
}
.nav-cta { margin-left: var(--space-4); }

/* Mobile toggle */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: var(--space-2);
}
.nav-toggle span {
  width: 22px; height: 2px;
  background: var(--gray-700);
  border-radius: 1px;
  transition: transform .3s, opacity .3s;
}
.nav-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ==========================================================================
   Buttons
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: 0.625rem 1.25rem;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 0.95rem;
  transition: all .2s ease;
  white-space: nowrap;
  border: 1.5px solid transparent;
}
.btn-primary {
  background: var(--blue-600);
  color: var(--white);
  box-shadow: 0 2px 8px rgba(37,99,235,0.25);
}
.btn-primary:hover {
  background: var(--blue-700);
  color: var(--white);
  transform: translateY(-1px);
  box-shadow: 0 4px 16px rgba(37,99,235,0.3);
}
.btn-ghost {
  background: transparent;
  color: var(--gray-700);
  border-color: var(--gray-200);
}
.btn-ghost:hover {
  background: var(--gray-50);
  color: var(--gray-900);
  border-color: var(--gray-300);
}
.btn-lg { padding: 0.875rem 2rem; font-size: 1.05rem; }
.btn-block { width: 100%; }

/* ==========================================================================
   Hero
   ========================================================================== */
.hero {
  padding-top: calc(var(--header-h) + var(--space-20));
  padding-bottom: var(--space-20);
  background:
    radial-gradient(ellipse 80% 50% at 50% -10%, rgba(37,99,235,0.08), transparent),
    radial-gradient(ellipse 60% 50% at 90% 10%, rgba(20,184,166,0.06), transparent);
}
.hero-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-16);
  align-items: center;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: 0.375rem 1rem;
  background: var(--blue-50);
  border: 1px solid var(--blue-100);
  border-radius: 999px;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--blue-700);
  margin-bottom: var(--space-6);
}
.pulse-dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--green-500);
  position: relative;
}
.pulse-dot::after {
  content: '';
  position: absolute;
  inset: -3px;
  border-radius: 50%;
  background: var(--green-500);
  opacity: 0.3;
  animation: pulse 2s ease-in-out infinite;
}
@keyframes pulse {
  0%, 100% { transform: scale(1); opacity: 0.3; }
  50% { transform: scale(1.5); opacity: 0; }
}
.hero-title {
  font-size: clamp(2.5rem, 5vw, 3.75rem);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.03em;
  color: var(--gray-900);
  margin-bottom: var(--space-6);
}
.gradient-text {
  background: linear-gradient(135deg, var(--blue-600), var(--teal-500));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.hero-subtitle {
  font-size: 1.15rem;
  color: var(--gray-600);
  line-height: 1.6;
  margin-bottom: var(--space-8);
  max-width: 520px;
}
.hero-actions {
  display: flex;
  gap: var(--space-4);
  margin-bottom: var(--space-12);
  flex-wrap: wrap;
}
.hero-stats {
  display: flex;
  gap: var(--space-12);
}
.stat {
  display: flex;
  flex-direction: column;
}
.stat-number {
  font-size: 2rem;
  font-weight: 800;
  color: var(--gray-900);
  letter-spacing: -0.02em;
}
.stat-label {
  font-size: 0.85rem;
  color: var(--gray-500);
  font-weight: 500;
}

/* Hero Visual — Inbox Card */
.hero-visual {
  display: flex;
  justify-content: center;
}
.inbox-card {
  width: 100%;
  max-width: 420px;
  background: var(--white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--gray-200);
  overflow: hidden;
  animation: float 6s ease-in-out infinite;
}
@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}
.inbox-header {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-4);
  background: var(--gray-50);
  border-bottom: 1px solid var(--border);
}
.inbox-dot {
  width: 10px; height: 10px;
  border-radius: 50%;
}
.inbox-dot.red    { background: #ff5f57; }
.inbox-dot.yellow { background: #ffbd2e; }
.inbox-dot.green  { background: #28c840; }
.inbox-title {
  margin-left: var(--space-3);
  font-size: 0.8rem;
  color: var(--gray-500);
  font-weight: 500;
}
.inbox-body { padding: var(--space-3); }
.inbox-email {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3);
  border-radius: var(--radius);
  margin-bottom: var(--space-1);
  transition: background .2s;
}
.inbox-email:hover { background: var(--gray-50); }
.inbox-email-icon {
  width: 32px; height: 32px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.inbox-email-icon svg { width: 16px; height: 16px; }
.inbox-good .inbox-email-icon { background: var(--green-100); color: var(--green-600); }
.inbox-bad  .inbox-email-icon { background: var(--coral-100); color: var(--coral-600); }
.inbox-email-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
}
.inbox-email-from {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--gray-900);
}
.inbox-email-subject {
  font-size: 0.78rem;
  color: var(--gray-500);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.inbox-tag {
  font-size: 0.7rem;
  font-weight: 600;
  padding: 0.2rem 0.5rem;
  border-radius: 999px;
  flex-shrink: 0;
}
.tag-good { background: var(--green-100); color: var(--green-700); }
.tag-bad  { background: var(--coral-100); color: var(--coral-600); }

/* ==========================================================================
   Sections
   ========================================================================== */
.section {
  padding: var(--space-24) 0;
}
.section-tight { padding: var(--space-12) 0; }
.section-alt { background: var(--gray-50); }
.section-head {
  text-align: center;
  max-width: 640px;
  margin: 0 auto var(--space-16);
}
.section-head-row {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  text-align: left;
  max-width: 100%;
}
.section-eyebrow {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--blue-600);
  margin-bottom: var(--space-3);
}
.section-title {
  font-size: clamp(1.75rem, 3vw, 2.25rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--gray-900);
  margin-bottom: var(--space-4);
}
.section-desc {
  font-size: 1.05rem;
  color: var(--gray-500);
  line-height: 1.6;
}

/* ==========================================================================
   Grid
   ========================================================================== */
.grid {
  display: grid;
  gap: var(--space-6);
}
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }

/* ==========================================================================
   Problem Cards
   ========================================================================== */
.problem-card {
  padding: var(--space-8);
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  transition: transform .25s, box-shadow .25s, border-color .25s;
}
.problem-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: var(--blue-200);
}
.problem-icon {
  width: 48px; height: 48px;
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-5);
}
.problem-icon svg { width: 24px; height: 24px; }
.icon-blue   { background: var(--blue-50);  color: var(--blue-600); }
.icon-amber  { background: var(--amber-50); color: var(--amber-600); }
.icon-green  { background: var(--green-50); color: var(--green-600); }
.icon-teal   { background: var(--teal-50);  color: var(--teal-600); }
.icon-coral  { background: var(--coral-50); color: var(--coral-600); }
.icon-violet { background: var(--violet-50); color: var(--violet-600); }
.problem-card h3 {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--gray-900);
  margin-bottom: var(--space-3);
}
.problem-card p {
  color: var(--gray-500);
  line-height: 1.6;
}

/* ==========================================================================
   Steps
   ========================================================================== */
.steps {
  display: flex;
  align-items: stretch;
  gap: var(--space-4);
  justify-content: center;
}
.step {
  flex: 1;
  max-width: 300px;
  text-align: center;
  padding: var(--space-8);
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
}
.step-number {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--blue-200);
  letter-spacing: -0.02em;
  margin-bottom: var(--space-3);
  font-family: var(--font-mono);
}
.step-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--gray-900);
  margin-bottom: var(--space-3);
}
.step-desc {
  color: var(--gray-500);
  line-height: 1.6;
}
.step-connector {
  display: flex;
  align-items: center;
  color: var(--gray-300);
}
.step-connector::before {
  content: '→';
  font-size: 1.5rem;
  font-weight: 700;
}

/* ==========================================================================
   Article Cards
   ========================================================================== */
.article-card {
  display: block;
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: transform .25s, box-shadow .25s, border-color .25s;
  color: inherit;
}
.article-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: var(--blue-200);
  color: inherit;
}
.article-card-image {
  height: 180px;
  position: relative;
  display: flex;
  align-items: flex-start;
  padding: var(--space-4);
  background: linear-gradient(135deg, var(--blue-900), var(--blue-600));
  overflow: hidden;
}
.article-card-image img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.article-card-category {
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.3rem 0.75rem;
  background: rgba(255,255,255,0.95);
  border-radius: 999px;
  color: var(--gray-700);
  backdrop-filter: blur(4px);
  position: relative;
  z-index: 1;
}
.article-card-body {
  padding: var(--space-5) var(--space-5) var(--space-6);
}
.article-card-date {
  font-size: 0.8rem;
  color: var(--gray-400);
  font-weight: 500;
}
.article-card-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--gray-900);
  margin: var(--space-2) 0 var(--space-3);
  line-height: 1.35;
  letter-spacing: -0.01em;
}
.article-card-excerpt {
  font-size: 0.92rem;
  color: var(--gray-500);
  line-height: 1.55;
}

/* Featured Article */
.featured-card {
  display: grid;
  grid-template-columns: 1fr 1fr;
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  overflow: hidden;
  transition: box-shadow .25s, border-color .25s;
  color: inherit;
}
.featured-card:hover {
  box-shadow: var(--shadow-md);
  border-color: var(--blue-200);
  color: inherit;
}
.featured-image {
  min-height: 320px;
  padding: var(--space-6);
  position: relative;
  background: linear-gradient(135deg, var(--blue-900), var(--blue-600));
  overflow: hidden;
}
.featured-image img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.featured-body {
  padding: var(--space-10);
  display: flex;
  flex-direction: column;
  justify-content: center;
}
.featured-title {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--gray-900);
  margin: var(--space-3) 0 var(--space-4);
  line-height: 1.25;
  letter-spacing: -0.02em;
}
.featured-excerpt {
  color: var(--gray-500);
  line-height: 1.6;
  margin-bottom: var(--space-6);
}

/* ==========================================================================
   Filter Bar
   ========================================================================== */
.filter-bar {
  display: flex;
  gap: var(--space-3);
  flex-wrap: wrap;
  justify-content: center;
}
.filter-chip {
  padding: 0.5rem 1.25rem;
  border-radius: 999px;
  border: 1.5px solid var(--border);
  background: var(--white);
  color: var(--gray-600);
  font-weight: 500;
  font-size: 0.9rem;
  transition: all .2s;
}
.filter-chip:hover {
  border-color: var(--blue-400);
  color: var(--blue-600);
}
.filter-chip.active {
  background: var(--blue-600);
  border-color: var(--blue-600);
  color: var(--white);
}

/* ==========================================================================
   CTA Section
   ========================================================================== */
.cta-section {
  padding: var(--space-20) 0;
}
.cta-box {
  text-align: center;
  background: linear-gradient(135deg, var(--gray-900), var(--blue-900));
  border-radius: var(--radius-xl);
  padding: var(--space-16) var(--space-12);
}
.cta-title {
  font-size: clamp(1.75rem, 3vw, 2.5rem);
  font-weight: 700;
  color: var(--white);
  margin-bottom: var(--space-4);
  letter-spacing: -0.02em;
}
.cta-desc {
  font-size: 1.1rem;
  color: rgba(255,255,255,0.7);
  margin-bottom: var(--space-8);
  max-width: 480px;
  margin-left: auto;
  margin-right: auto;
}

/* ==========================================================================
   Page Headers
   ========================================================================== */
.page-header {
  padding-top: calc(var(--header-h) + var(--space-20));
  padding-bottom: var(--space-12);
  text-align: center;
  background:
    radial-gradient(ellipse 80% 50% at 50% -10%, rgba(37,99,235,0.08), transparent);
}
.page-header-alt {
  background:
    radial-gradient(ellipse 80% 50% at 50% -10%, rgba(20,184,166,0.08), transparent);
}
.page-title {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--gray-900);
  margin-bottom: var(--space-4);
}
.page-subtitle {
  font-size: 1.15rem;
  color: var(--gray-500);
  max-width: 560px;
  margin: 0 auto;
  line-height: 1.6;
}

/* ==========================================================================
   Pricing Cards
   ========================================================================== */
.pricing-card {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--space-8);
  display: flex;
  flex-direction: column;
  position: relative;
  transition: transform .25s, box-shadow .25s;
}
.pricing-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}
.pricing-featured {
  border-color: var(--blue-500);
  border-width: 2px;
  box-shadow: var(--shadow-md);
}
.pricing-badge {
  position: absolute;
  top: -12px; left: 50%;
  transform: translateX(-50%);
  background: var(--blue-600);
  color: var(--white);
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.3rem 1rem;
  border-radius: 999px;
  white-space: nowrap;
}
.pricing-name {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--gray-900);
  margin-bottom: var(--space-2);
}
.pricing-desc {
  color: var(--gray-500);
  font-size: 0.92rem;
  margin-bottom: var(--space-6);
  line-height: 1.5;
}
.pricing-price {
  display: flex;
  align-items: baseline;
  gap: var(--space-2);
  margin-bottom: var(--space-8);
}
.pricing-amount {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--gray-900);
  letter-spacing: -0.02em;
}
.pricing-period {
  color: var(--gray-400);
  font-weight: 500;
}
.pricing-features {
  list-style: none;
  margin-bottom: var(--space-8);
  flex: 1;
}
.pricing-features li {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-2) 0;
  color: var(--gray-600);
  font-size: 0.95rem;
}
.check-icon {
  width: 20px; height: 20px;
  border-radius: 50%;
  background: var(--green-100);
  flex-shrink: 0;
  position: relative;
}
.check-icon::after {
  content: '';
  position: absolute;
  left: 6px; top: 3px;
  width: 5px; height: 9px;
  border: solid var(--green-600);
  border-width: 0 2px 2px 0;
  transform: rotate(45deg);
}

/* ==========================================================================
   Service Rows
   ========================================================================== */
.service-row {
  display: flex;
  gap: var(--space-5);
  padding: var(--space-8);
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  transition: box-shadow .25s, border-color .25s;
}
.service-row:hover {
  box-shadow: var(--shadow);
  border-color: var(--blue-200);
}
.service-row-icon {
  width: 48px; height: 48px;
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.service-row-icon svg { width: 24px; height: 24px; }
.service-row h3 {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--gray-900);
  margin-bottom: var(--space-2);
}
.service-row p {
  color: var(--gray-500);
  line-height: 1.6;
  font-size: 0.95rem;
}

/* ==========================================================================
   FAQ
   ========================================================================== */
.faq-list {
  max-width: 720px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}
.faq-item {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: box-shadow .2s;
}
.faq-item[open] {
  box-shadow: var(--shadow);
}
.faq-item summary {
  padding: var(--space-5) var(--space-6);
  font-weight: 600;
  font-size: 1.05rem;
  color: var(--gray-900);
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after {
  content: '+';
  font-size: 1.5rem;
  color: var(--gray-400);
  transition: transform .2s;
  flex-shrink: 0;
}
.faq-item[open] summary::after {
  transform: rotate(45deg);
}
.faq-item p {
  padding: 0 var(--space-6) var(--space-6);
  color: var(--gray-500);
  line-height: 1.6;
}

/* ==========================================================================
   Contact Page
   ========================================================================== */
.contact-layout {
  display: grid;
  grid-template-columns: 1.5fr 1fr;
  gap: var(--space-10);
  align-items: start;
}
.contact-form-wrap {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--space-10);
  box-shadow: var(--shadow-sm);
}
.contact-form {
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
}
.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}
.form-group label {
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--gray-700);
}
.form-group input,
.form-group select,
.form-group textarea {
  padding: 0.75rem 1rem;
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  color: var(--gray-800);
  background: var(--gray-50);
  transition: border-color .2s, background .2s;
}
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--blue-500);
  background: var(--white);
}
.form-group input.error,
.form-group select.error,
.form-group textarea.error {
  border-color: var(--coral-500);
  background: var(--coral-50);
}
.form-error {
  font-size: 0.82rem;
  color: var(--coral-600);
  display: none;
}
.form-error.show { display: block; }
.form-success {
  display: none;
  padding: var(--space-4);
  background: var(--green-50);
  border: 1px solid var(--green-100);
  border-radius: var(--radius);
  color: var(--green-700);
  font-weight: 500;
  text-align: center;
}
.form-success.show { display: block; }
.form-send-error {
  display: none;
  padding: var(--space-4);
  background: var(--coral-50);
  border: 1px solid var(--coral-100);
  border-radius: var(--radius);
  color: var(--coral-600);
  font-weight: 500;
  text-align: center;
}
.form-send-error.show { display: block; }
.hp-field {
  position: absolute;
  left: -9999px;
  height: 0;
  overflow: hidden;
}

/* Sidebar */
.contact-sidebar {
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
}
.sidebar-card {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--space-8);
}
.sidebar-card-alt {
  background: var(--gray-900);
  border-color: var(--gray-900);
  color: var(--white);
}
.sidebar-card h3 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: var(--space-5);
  color: var(--gray-900);
}
.sidebar-card-alt h3 { color: var(--white); }
.contact-methods {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
}
.contact-methods li {
  display: flex;
  gap: var(--space-3);
  align-items: flex-start;
}
.contact-method-icon {
  width: 40px; height: 40px;
  border-radius: var(--radius);
  background: var(--blue-50);
  color: var(--blue-600);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.contact-method-icon svg { width: 20px; height: 20px; }
.contact-method-label {
  display: block;
  font-size: 0.78rem;
  color: var(--gray-400);
  font-weight: 500;
  margin-bottom: 2px;
}
.sidebar-steps {
  list-style: decimal;
  padding-left: var(--space-5);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}
.sidebar-steps li {
  color: rgba(255,255,255,0.8);
  font-size: 0.92rem;
  line-height: 1.5;
}
.sidebar-steps li::marker {
  color: var(--blue-400);
  font-weight: 700;
}

/* ==========================================================================
   Article Page
   ========================================================================== */
.article-hero {
  padding-top: calc(var(--header-h) + var(--space-16));
  padding-bottom: var(--space-12);
  background:
    radial-gradient(ellipse 80% 50% at 50% -10%, rgba(37,99,235,0.08), transparent);
}
.article-hero-inner {
  max-width: 760px;
  margin: 0 auto;
  text-align: center;
}
.article-hero-image {
  max-width: 960px;
  margin: 0 auto var(--space-4);
  border-radius: var(--radius-xl);
  overflow: hidden;
  aspect-ratio: 16 / 9;
  background: var(--gray-100);
}
.article-hero-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.article-back {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  color: var(--gray-500);
  font-size: 0.9rem;
  font-weight: 500;
  margin-bottom: var(--space-6);
  transition: color .2s;
}
.article-back:hover { color: var(--blue-600); }
.article-meta {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-4);
  margin-bottom: var(--space-4);
  flex-wrap: wrap;
}
.article-category-tag {
  font-size: 0.78rem;
  font-weight: 600;
  padding: 0.3rem 0.75rem;
  background: var(--blue-50);
  color: var(--blue-700);
  border-radius: 999px;
}
.article-meta-text {
  font-size: 0.88rem;
  color: var(--gray-400);
}
.article-title {
  font-size: clamp(2rem, 4vw, 2.75rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--gray-900);
  line-height: 1.15;
  margin-bottom: var(--space-5);
}
.article-subtitle {
  font-size: 1.2rem;
  color: var(--gray-500);
  line-height: 1.5;
  margin-bottom: var(--space-8);
}
.article-author {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-3);
}
.author-avatar {
  width: 44px; height: 44px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--blue-600), var(--teal-500));
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--white);
  font-weight: 700;
  font-size: 1.1rem;
}
.author-info {
  text-align: left;
}
.author-name {
  font-weight: 600;
  color: var(--gray-900);
  font-size: 0.95rem;
}
.author-role {
  font-size: 0.82rem;
  color: var(--gray-400);
}

/* Article Body */
.article-body {
  max-width: 760px;
  margin: 0 auto;
  padding: var(--space-12) var(--space-6);
}
.article-body h2 {
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--gray-900);
  margin-top: var(--space-12);
  margin-bottom: var(--space-4);
  letter-spacing: -0.02em;
}
.article-body h2:first-child { margin-top: 0; }
.article-body h3 {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--gray-900);
  margin-top: var(--space-8);
  margin-bottom: var(--space-3);
}
.article-body p {
  color: var(--gray-700);
  line-height: 1.75;
  margin-bottom: var(--space-5);
  font-size: 1.05rem;
}
.article-body ul,
.article-body ol {
  padding-left: var(--space-6);
  margin-bottom: var(--space-5);
}
.article-body li {
  color: var(--gray-700);
  line-height: 1.75;
  margin-bottom: var(--space-2);
  font-size: 1.05rem;
}
.article-body strong { color: var(--gray-900); font-weight: 600; }
.article-body code {
  font-family: var(--font-mono);
  font-size: 0.9em;
  background: var(--gray-100);
  padding: 0.15em 0.4em;
  border-radius: 4px;
  color: var(--blue-700);
}
.article-body pre {
  background: var(--gray-900);
  color: var(--gray-100);
  padding: var(--space-5);
  border-radius: var(--radius);
  overflow-x: auto;
  margin-bottom: var(--space-6);
  font-size: 0.9rem;
  line-height: 1.6;
}
.article-body pre code {
  background: none;
  color: inherit;
  padding: 0;
}
.article-body table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: var(--space-6);
  font-size: 0.95rem;
}
.article-body th,
.article-body td {
  text-align: left;
  padding: var(--space-3) var(--space-4);
  border-bottom: 1px solid var(--border);
  color: var(--gray-700);
  vertical-align: top;
}
.article-body th {
  font-weight: 600;
  color: var(--gray-900);
  background: var(--gray-50);
}
.callout {
  background: var(--blue-50);
  border-left: 4px solid var(--blue-500);
  padding: var(--space-5) var(--space-6);
  border-radius: 0 var(--radius) var(--radius) 0;
  margin: var(--space-8) 0;
}
.callout-title {
  font-weight: 700;
  color: var(--blue-900);
  margin-bottom: var(--space-2);
  font-size: 1rem;
}
.callout p {
  margin-bottom: 0;
  color: var(--gray-700);
  font-size: 0.98rem;
}

/* Article Footer */
.article-footer {
  max-width: 760px;
  margin: 0 auto;
  padding: var(--space-8) var(--space-6) var(--space-20);
  border-top: 1px solid var(--border);
}
.article-share {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  margin-bottom: var(--space-12);
}
.share-label {
  font-weight: 600;
  color: var(--gray-700);
  font-size: 0.9rem;
}
.share-link {
  width: 40px; height: 40px;
  border-radius: 50%;
  border: 1.5px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--gray-500);
  transition: all .2s;
}
.share-link:hover {
  border-color: var(--blue-500);
  color: var(--blue-600);
  background: var(--blue-50);
}
.share-link svg { width: 18px; height: 18px; }
.article-nav {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-4);
}
.article-nav-link {
  padding: var(--space-5);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: border-color .2s, box-shadow .2s;
  color: inherit;
}
.article-nav-link:hover {
  border-color: var(--blue-200);
  box-shadow: var(--shadow);
  color: inherit;
}
.article-nav-label {
  font-size: 0.8rem;
  color: var(--gray-400);
  font-weight: 500;
  margin-bottom: var(--space-1);
}
.article-nav-title {
  font-weight: 600;
  color: var(--gray-900);
  font-size: 0.98rem;
  line-height: 1.4;
}
.article-nav-link.next { text-align: right; }

/* ==========================================================================
   Footer
   ========================================================================== */
.site-footer {
  background: var(--gray-900);
  padding: var(--space-16) 0 var(--space-8);
}
.footer-inner {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: var(--space-12);
  padding-bottom: var(--space-12);
  border-bottom: 1px solid rgba(255,255,255,0.1);
}
.logo-footer { color: var(--white); }
.logo-footer:hover { color: var(--white); }
.footer-tagline {
  color: rgba(255,255,255,0.5);
  font-size: 0.92rem;
  line-height: 1.6;
  margin-top: var(--space-4);
  max-width: 300px;
}
.footer-links {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-8);
}
.footer-col h4 {
  color: var(--white);
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: var(--space-4);
}
.footer-col a {
  display: block;
  color: rgba(255,255,255,0.5);
  font-size: 0.92rem;
  padding: var(--space-1) 0;
  transition: color .2s;
}
.footer-col a:hover {
  color: var(--white);
}
.footer-bottom {
  padding-top: var(--space-6);
  text-align: center;
}
.footer-bottom p {
  color: rgba(255,255,255,0.4);
  font-size: 0.85rem;
}

/* ==========================================================================
   Responsive
   ========================================================================== */
@media (max-width: 900px) {
  .hero-inner { grid-template-columns: 1fr; gap: var(--space-12); }
  .hero-visual { order: -1; }
  .featured-card { grid-template-columns: 1fr; }
  .featured-image { min-height: 200px; }
  .contact-layout { grid-template-columns: 1fr; }
  .footer-inner { grid-template-columns: 1fr; gap: var(--space-8); }
  .steps { flex-direction: column; }
  .step-connector { display: none; }
}

@media (max-width: 768px) {
  .main-nav, .nav-cta {
    display: none;
    position: absolute;
    top: var(--header-h); left: 0; right: 0;
    background: var(--white);
    flex-direction: column;
    padding: var(--space-6);
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow-md);
    gap: var(--space-4);
    align-items: stretch;
  }
  .main-nav.open { display: flex; }
  .nav-cta.open { display: flex; }
  .nav-toggle { display: flex; }
  .grid-2, .grid-3 { grid-template-columns: 1fr; }
  .footer-links { grid-template-columns: 1fr; gap: var(--space-6); }
  .hero-stats { flex-wrap: wrap; gap: var(--space-6); }
  .article-nav { grid-template-columns: 1fr; }
  .article-nav-link.next { text-align: left; }
  .section-head-row { flex-direction: column; gap: var(--space-4); align-items: flex-start; }
}

@media (max-width: 480px) {
  .container { padding: 0 var(--space-4); }
  .hero { padding-top: calc(var(--header-h) + var(--space-12)); }
  .hero-actions { flex-direction: column; }
  .hero-actions .btn { width: 100%; }
  .cta-box { padding: var(--space-10) var(--space-6); }
  .contact-form-wrap { padding: var(--space-6); }
  .featured-body { padding: var(--space-6); }
}