/* ========================================
   Sentinel Design System
   Minimalist, High-Contrast Theme
   ======================================== */

/* CSS Custom Properties (Design Tokens) */
:root {
  /* Colors */
  --color-bg: #FFFFFF;
  --color-text: #000000;
  --color-accent: #00B7FF;
  --color-muted-bg: #F5F5F6;
  --color-muted-text: #666666;
  --color-border: #E9E9EA;
  --color-white: #FFFFFF;
  --color-black: #000000;

  /* Typography */
  --font-sans: Inter, "SF Pro Display", system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: "SFMono-Regular", Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;

  /* Font Sizes */
  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.5rem;
  --text-3xl: 1.875rem;
  --text-4xl: 2.25rem;
  --text-5xl: 3rem;
  --text-6xl: 3.5rem;

  /* Spacing */
  --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;

  /* Layout */
  --max-width: 1100px;
  --gutter-mobile: 24px;
  --gutter-desktop: 48px;

  /* Borders */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 16px;

  /* Shadows */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 6px 20px rgba(0, 0, 0, 0.04);
  --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.08);

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 400ms ease;

  /* Line Heights */
  --leading-tight: 1.2;
  --leading-normal: 1.5;
  --leading-relaxed: 1.75;
}

/* ========================================
   Reset & Base Styles
   ======================================== */

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

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

img, picture, video, canvas, svg {
  display: block;
  max-width: 100%;
  height: auto;
}

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

a {
  color: inherit;
  text-decoration: none;
}

ul, ol {
  list-style: none;
}

/* ========================================
   Typography
   ======================================== */

h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  line-height: var(--leading-tight);
  letter-spacing: -0.02em;
}

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

h2 {
  font-size: var(--text-3xl);
}

h3 {
  font-size: var(--text-2xl);
}

h4 {
  font-size: var(--text-xl);
}

h5 {
  font-size: var(--text-lg);
}

h6 {
  font-size: var(--text-base);
}

@media (min-width: 768px) {
  h1 {
    font-size: var(--text-6xl);
  }

  h2 {
    font-size: var(--text-4xl);
  }

  h3 {
    font-size: var(--text-3xl);
  }
}

p {
  margin-bottom: var(--space-4);
}

p:last-child {
  margin-bottom: 0;
}

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

.text-accent {
  color: var(--color-accent);
}

.text-center {
  text-align: center;
}

.text-mono {
  font-family: var(--font-mono);
}

/* ========================================
   Layout
   ======================================== */

.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--gutter-mobile);
}

@media (min-width: 768px) {
  .container {
    padding: 0 var(--gutter-desktop);
  }
}

.section {
  padding: var(--space-16) 0;
}

@media (min-width: 768px) {
  .section {
    padding: var(--space-24) 0;
  }
}

.section--muted {
  background-color: var(--color-muted-bg);
}

.section--dark {
  background-color: var(--color-black);
  color: var(--color-white);
}

/* Grid */
.grid {
  display: grid;
  gap: var(--space-6);
}

.grid--2 {
  grid-template-columns: 1fr;
}

.grid--3 {
  grid-template-columns: 1fr;
}

.grid--4 {
  grid-template-columns: 1fr;
}

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

  .grid--3 {
    grid-template-columns: repeat(2, 1fr);
  }

  .grid--4 {
    grid-template-columns: repeat(2, 1fr);
  }
}

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

  .grid--4 {
    grid-template-columns: repeat(4, 1fr);
  }
}

/* Flex utilities */
.flex {
  display: flex;
}

.flex-col {
  flex-direction: column;
}

.flex-wrap {
  flex-wrap: wrap;
}

.items-center {
  align-items: center;
}

.items-start {
  align-items: flex-start;
}

.justify-center {
  justify-content: center;
}

.justify-between {
  justify-content: space-between;
}

.gap-2 {
  gap: var(--space-2);
}

.gap-4 {
  gap: var(--space-4);
}

.gap-6 {
  gap: var(--space-6);
}

.gap-8 {
  gap: var(--space-8);
}

/* ========================================
   Buttons
   ======================================== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  font-size: var(--text-base);
  font-weight: 500;
  line-height: 1;
  text-decoration: none;
  border: 2px solid transparent;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.btn:focus {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

.btn--primary {
  background-color: var(--color-black);
  color: var(--color-white);
  border-color: var(--color-black);
}

.btn--primary:hover {
  background-color: var(--color-white);
  color: var(--color-black);
}

.btn--secondary {
  background-color: transparent;
  color: var(--color-black);
  border-color: var(--color-black);
}

.btn--secondary:hover {
  background-color: var(--color-black);
  color: var(--color-white);
}

.btn--accent {
  background-color: var(--color-accent);
  color: var(--color-white);
  border-color: var(--color-accent);
}

.btn--accent:hover {
  background-color: var(--color-white);
  color: var(--color-accent);
}

.btn--ghost {
  background-color: transparent;
  color: var(--color-black);
  border-color: transparent;
}

.btn--ghost:hover {
  background-color: var(--color-muted-bg);
}

.btn--sm {
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-sm);
}

.btn--lg {
  padding: var(--space-4) var(--space-8);
  font-size: var(--text-lg);
}

/* Inverted buttons for dark sections */
.section--dark .btn--primary {
  background-color: var(--color-white);
  color: var(--color-black);
  border-color: var(--color-white);
}

.section--dark .btn--primary:hover {
  background-color: var(--color-accent);
  color: var(--color-white);
  border-color: var(--color-accent);
}

.section--dark .btn--secondary {
  color: var(--color-white);
  border-color: var(--color-white);
}

.section--dark .btn--secondary:hover {
  background-color: var(--color-white);
  color: var(--color-black);
}

/* ========================================
   Cards
   ======================================== */

.card {
  background-color: var(--color-bg);
  padding: var(--space-6);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.card--muted {
  background-color: var(--color-muted-bg);
  box-shadow: none;
}

.card--muted:hover {
  box-shadow: var(--shadow-md);
}

.card--bordered {
  border: 1px solid var(--color-border);
  box-shadow: none;
}

.card__title {
  font-size: var(--text-xl);
  font-weight: 600;
  margin-bottom: var(--space-3);
}

.card__description {
  color: var(--color-muted-text);
  margin-bottom: var(--space-4);
}

.card__icon {
  width: 48px;
  height: 48px;
  margin-bottom: var(--space-4);
}

/* ========================================
   Header / Navigation
   ======================================== */

.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
}

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

.header__logo {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-xl);
  font-weight: 700;
  letter-spacing: -0.02em;
}

.header__logo svg {
  width: 32px;
  height: 32px;
}

.nav {
  display: none;
}

@media (min-width: 1024px) {
  .nav {
    display: flex;
    align-items: center;
    gap: var(--space-8);
  }
}

.nav__link {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-muted-text);
  transition: color var(--transition-fast);
}

.nav__link:hover,
.nav__link--active {
  color: var(--color-text);
}

.nav__dropdown {
  position: relative;
}

.nav__dropdown-menu {
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%);
  min-width: 200px;
  padding: var(--space-2);
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-fast), visibility var(--transition-fast);
}

.nav__dropdown:hover .nav__dropdown-menu {
  opacity: 1;
  visibility: visible;
}

.nav__dropdown-item {
  display: block;
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-sm);
  color: var(--color-muted-text);
  border-radius: var(--radius-sm);
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

.nav__dropdown-item:hover {
  background-color: var(--color-muted-bg);
  color: var(--color-text);
}

.header__actions {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.header__menu-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background: none;
  border: none;
  cursor: pointer;
}

@media (min-width: 1024px) {
  .header__menu-btn {
    display: none;
  }
}

/* Mobile Menu */
.mobile-nav {
  position: fixed;
  top: 72px;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: var(--color-bg);
  padding: var(--space-6);
  transform: translateX(100%);
  transition: transform var(--transition-base);
  z-index: 99;
  overflow-y: auto;
}

.mobile-nav.is-open {
  transform: translateX(0);
}

.mobile-nav__link {
  display: block;
  padding: var(--space-4) 0;
  font-size: var(--text-lg);
  font-weight: 500;
  border-bottom: 1px solid var(--color-border);
}

.mobile-nav__group-title {
  display: block;
  padding: var(--space-4) 0;
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-muted-text);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.mobile-nav__sublink {
  display: block;
  padding: var(--space-3) var(--space-4);
  font-size: var(--text-base);
  color: var(--color-muted-text);
}

/* ========================================
   Hero
   ======================================== */

.hero {
  padding: var(--space-16) 0;
  text-align: center;
}

@media (min-width: 768px) {
  .hero {
    padding: var(--space-24) 0;
  }
}

.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  margin-bottom: var(--space-6);
  font-size: var(--text-sm);
  font-weight: 500;
  background-color: var(--color-muted-bg);
  border-radius: 100px;
}

.hero__title {
  max-width: 900px;
  margin: 0 auto var(--space-6);
}

.hero__subtitle {
  max-width: 640px;
  margin: 0 auto var(--space-8);
  font-size: var(--text-lg);
  color: var(--color-muted-text);
}

@media (min-width: 768px) {
  .hero__subtitle {
    font-size: var(--text-xl);
  }
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-4);
}

/* ========================================
   Value Rail / Features
   ======================================== */

.value-rail {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-8);
  padding: var(--space-12) 0;
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

@media (min-width: 768px) {
  .value-rail {
    grid-template-columns: repeat(3, 1fr);
    text-align: center;
  }
}

.value-rail__item {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.value-rail__icon {
  width: 48px;
  height: 48px;
  margin-bottom: var(--space-4);
}

.value-rail__title {
  font-size: var(--text-lg);
  font-weight: 600;
  margin-bottom: var(--space-2);
}

.value-rail__description {
  color: var(--color-muted-text);
  font-size: var(--text-sm);
}

/* ========================================
   Process / Steps
   ======================================== */

.steps {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
  counter-reset: step;
}

@media (min-width: 768px) {
  .steps {
    grid-template-columns: repeat(4, 1fr);
  }
}

.step {
  position: relative;
  text-align: center;
}

.step__number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  margin-bottom: var(--space-4);
  font-size: var(--text-xl);
  font-weight: 700;
  background-color: var(--color-black);
  color: var(--color-white);
  border-radius: 50%;
}

.step__title {
  font-size: var(--text-lg);
  font-weight: 600;
  margin-bottom: var(--space-2);
}

.step__description {
  color: var(--color-muted-text);
  font-size: var(--text-sm);
}

/* Connector line between steps */
@media (min-width: 768px) {
  .step:not(:last-child)::after {
    content: '';
    position: absolute;
    top: 24px;
    right: -50%;
    width: 100%;
    height: 2px;
    background-color: var(--color-border);
    z-index: -1;
  }
}

/* ========================================
   Trust Bar / Logos
   ======================================== */

.trust-bar {
  text-align: center;
  padding: var(--space-12) 0;
}

.trust-bar__label {
  font-size: var(--text-sm);
  color: var(--color-muted-text);
  margin-bottom: var(--space-6);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.trust-bar__logos {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: var(--space-8);
  margin-bottom: var(--space-8);
}

.trust-bar__logo {
  height: 32px;
  opacity: 0.6;
  filter: grayscale(100%);
  transition: opacity var(--transition-fast), filter var(--transition-fast);
}

.trust-bar__logo:hover {
  opacity: 1;
  filter: grayscale(0%);
}

.trust-bar__testimonial {
  max-width: 640px;
  margin: 0 auto;
  padding: var(--space-6);
  background-color: var(--color-muted-bg);
  border-radius: var(--radius-md);
}

.trust-bar__quote {
  font-size: var(--text-lg);
  font-style: italic;
  margin-bottom: var(--space-4);
}

.trust-bar__author {
  font-size: var(--text-sm);
  color: var(--color-muted-text);
}

/* ========================================
   Pricing
   ======================================== */

.pricing-toggle {
  display: flex;
  justify-content: center;
  gap: var(--space-4);
  margin-bottom: var(--space-8);
}

.pricing-toggle__option {
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-sm);
  font-weight: 500;
  background-color: transparent;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.pricing-toggle__option.is-active {
  background-color: var(--color-black);
  color: var(--color-white);
  border-color: var(--color-black);
}

.pricing-cards {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
}

@media (min-width: 768px) {
  .pricing-cards {
    grid-template-columns: repeat(3, 1fr);
    align-items: stretch;
  }
}

.pricing-card {
  display: flex;
  flex-direction: column;
  padding: var(--space-8);
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.pricing-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.pricing-card--featured {
  border-color: var(--color-black);
  border-width: 2px;
}

.pricing-card__badge {
  display: inline-block;
  padding: var(--space-1) var(--space-3);
  margin-bottom: var(--space-4);
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  background-color: var(--color-black);
  color: var(--color-white);
  border-radius: 100px;
}

.pricing-card__name {
  font-size: var(--text-2xl);
  font-weight: 600;
  margin-bottom: var(--space-2);
}

.pricing-card__price {
  font-size: var(--text-4xl);
  font-weight: 700;
  margin-bottom: var(--space-1);
}

.pricing-card__price span {
  font-size: var(--text-lg);
  font-weight: 400;
  color: var(--color-muted-text);
}

.pricing-card__billing {
  font-size: var(--text-sm);
  color: var(--color-muted-text);
  margin-bottom: var(--space-6);
}

.pricing-card__features {
  flex: 1;
  margin-bottom: var(--space-6);
}

.pricing-card__feature {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  padding: var(--space-2) 0;
  font-size: var(--text-sm);
}

.pricing-card__feature svg {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
  color: var(--color-accent);
}

.pricing-card__cta {
  width: 100%;
}

/* ========================================
   Forms
   ======================================== */

.form {
  max-width: 600px;
  margin: 0 auto;
}

.form__group {
  margin-bottom: var(--space-6);
}

.form__label {
  display: block;
  margin-bottom: var(--space-2);
  font-size: var(--text-sm);
  font-weight: 500;
}

.form__input,
.form__textarea,
.form__select {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  font-size: var(--text-base);
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form__input:focus,
.form__textarea:focus,
.form__select:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(0, 183, 255, 0.1);
}

.form__textarea {
  min-height: 120px;
  resize: vertical;
}

.form__checkbox {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
}

.form__checkbox input {
  width: 20px;
  height: 20px;
  margin-top: 2px;
  accent-color: var(--color-black);
}

.form__checkbox-label {
  font-size: var(--text-sm);
  color: var(--color-muted-text);
}

.form__error {
  margin-top: var(--space-2);
  font-size: var(--text-sm);
  color: #E53E3E;
}

.form__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
}

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

/* ========================================
   Code Blocks
   ======================================== */

.code-block {
  position: relative;
  margin: var(--space-6) 0;
  background-color: #1a1a1a;
  border-radius: var(--radius-md);
  overflow: hidden;
}

.code-block__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-3) var(--space-4);
  background-color: #2a2a2a;
  border-bottom: 1px solid #333;
}

.code-block__lang {
  font-size: var(--text-xs);
  font-weight: 500;
  color: #888;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.code-block__copy {
  padding: var(--space-1) var(--space-2);
  font-size: var(--text-xs);
  color: #888;
  background-color: transparent;
  border: 1px solid #444;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.code-block__copy:hover {
  color: #fff;
  border-color: #666;
}

.code-block pre {
  margin: 0;
  padding: var(--space-4);
  overflow-x: auto;
}

.code-block code {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: #e6e6e6;
  line-height: var(--leading-relaxed);
}

/* ========================================
   FAQ / Accordion
   ======================================== */

.faq-list {
  max-width: 800px;
  margin: 0 auto;
}

.faq-item {
  border-bottom: 1px solid var(--color-border);
}

.faq-item__question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: var(--space-5) 0;
  font-size: var(--text-lg);
  font-weight: 500;
  text-align: left;
  background: none;
  border: none;
  cursor: pointer;
  transition: color var(--transition-fast);
}

.faq-item__question:hover {
  color: var(--color-accent);
}

.faq-item__icon {
  flex-shrink: 0;
  width: 24px;
  height: 24px;
  transition: transform var(--transition-fast);
}

.faq-item.is-open .faq-item__icon {
  transform: rotate(45deg);
}

.faq-item__answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-base);
}

.faq-item.is-open .faq-item__answer {
  max-height: 500px;
}

.faq-item__answer-inner {
  padding-bottom: var(--space-5);
  color: var(--color-muted-text);
}

/* ========================================
   Blog
   ======================================== */

.blog-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-8);
}

@media (min-width: 768px) {
  .blog-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

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

.blog-card {
  display: flex;
  flex-direction: column;
}

.blog-card__image {
  aspect-ratio: 16 / 9;
  margin-bottom: var(--space-4);
  background-color: var(--color-muted-bg);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.blog-card__image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.blog-card__meta {
  display: flex;
  gap: var(--space-4);
  margin-bottom: var(--space-3);
  font-size: var(--text-sm);
  color: var(--color-muted-text);
}

.blog-card__title {
  font-size: var(--text-xl);
  font-weight: 600;
  margin-bottom: var(--space-2);
  transition: color var(--transition-fast);
}

.blog-card:hover .blog-card__title {
  color: var(--color-accent);
}

.blog-card__excerpt {
  color: var(--color-muted-text);
  margin-bottom: var(--space-4);
}

.blog-card__link {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-accent);
}

/* Blog Post */
.blog-post {
  max-width: 720px;
  margin: 0 auto;
}

.blog-post__header {
  text-align: center;
  margin-bottom: var(--space-12);
}

.blog-post__meta {
  display: flex;
  justify-content: center;
  gap: var(--space-4);
  margin-bottom: var(--space-6);
  font-size: var(--text-sm);
  color: var(--color-muted-text);
}

.blog-post__content h2 {
  margin-top: var(--space-10);
  margin-bottom: var(--space-4);
}

.blog-post__content h3 {
  margin-top: var(--space-8);
  margin-bottom: var(--space-3);
}

.blog-post__content p {
  margin-bottom: var(--space-5);
}

.blog-post__content ul,
.blog-post__content ol {
  margin-bottom: var(--space-5);
  padding-left: var(--space-6);
}

.blog-post__content li {
  margin-bottom: var(--space-2);
  list-style: disc;
}

.blog-post__content ol li {
  list-style: decimal;
}

.blog-post__content blockquote {
  margin: var(--space-6) 0;
  padding: var(--space-4) var(--space-6);
  border-left: 4px solid var(--color-accent);
  background-color: var(--color-muted-bg);
  font-style: italic;
}

/* ========================================
   Footer
   ======================================== */

.footer {
  padding: var(--space-16) 0 var(--space-8);
  background-color: var(--color-black);
  color: var(--color-white);
}

.footer__top {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-8);
  margin-bottom: var(--space-12);
}

@media (min-width: 768px) {
  .footer__top {
    grid-template-columns: 2fr 1fr 1fr 1fr;
  }
}

.footer__brand {
  max-width: 300px;
}

.footer__logo {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin-bottom: var(--space-4);
  font-size: var(--text-xl);
  font-weight: 700;
}

.footer__description {
  color: rgba(255, 255, 255, 0.6);
  font-size: var(--text-sm);
  margin-bottom: var(--space-4);
}

.footer__badges {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.footer__badge {
  padding: var(--space-1) var(--space-2);
  font-size: var(--text-xs);
  font-weight: 500;
  background-color: rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-sm);
}

.footer__nav-title {
  font-size: var(--text-sm);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-4);
}

.footer__nav-link {
  display: block;
  padding: var(--space-2) 0;
  font-size: var(--text-sm);
  color: rgba(255, 255, 255, 0.6);
  transition: color var(--transition-fast);
}

.footer__nav-link:hover {
  color: var(--color-white);
}

.footer__bottom {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  padding-top: var(--space-8);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  font-size: var(--text-sm);
  color: rgba(255, 255, 255, 0.6);
}

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

.footer__legal {
  display: flex;
  gap: var(--space-6);
}

.footer__legal a:hover {
  color: var(--color-white);
}

/* ========================================
   Utilities
   ======================================== */

/* Spacing */
.mt-4 { margin-top: var(--space-4); }
.mt-6 { margin-top: var(--space-6); }
.mt-8 { margin-top: var(--space-8); }
.mt-12 { margin-top: var(--space-12); }
.mt-16 { margin-top: var(--space-16); }

.mb-4 { margin-bottom: var(--space-4); }
.mb-6 { margin-bottom: var(--space-6); }
.mb-8 { margin-bottom: var(--space-8); }
.mb-12 { margin-bottom: var(--space-12); }
.mb-16 { margin-bottom: var(--space-16); }

.py-8 { padding-top: var(--space-8); padding-bottom: var(--space-8); }
.py-12 { padding-top: var(--space-12); padding-bottom: var(--space-12); }
.py-16 { padding-top: var(--space-16); padding-bottom: var(--space-16); }

/* Display */
.hidden { display: none; }

@media (min-width: 768px) {
  .md\:block { display: block; }
  .md\:hidden { display: none; }
}

/* Max Width */
.max-w-lg { max-width: 512px; }
.max-w-xl { max-width: 640px; }
.max-w-2xl { max-width: 720px; }
.max-w-3xl { max-width: 900px; }

/* ========================================
   Animations
   ======================================== */

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes slideIn {
  from {
    opacity: 0;
    transform: translateX(-20px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

.animate-fade-in {
  animation: fadeIn 0.6s ease forwards;
}

.animate-slide-in {
  animation: slideIn 0.4s ease forwards;
}

/* Stagger children */
.stagger-children > * {
  opacity: 0;
  animation: fadeIn 0.5s ease forwards;
}

.stagger-children > *:nth-child(1) { animation-delay: 0.1s; }
.stagger-children > *:nth-child(2) { animation-delay: 0.2s; }
.stagger-children > *:nth-child(3) { animation-delay: 0.3s; }
.stagger-children > *:nth-child(4) { animation-delay: 0.4s; }

/* ========================================
   Skip Link (Accessibility)
   ======================================== */

.skip-link {
  position: absolute;
  top: -40px;
  left: 0;
  padding: var(--space-2) var(--space-4);
  background-color: var(--color-black);
  color: var(--color-white);
  z-index: 1000;
  transition: top var(--transition-fast);
}

.skip-link:focus {
  top: 0;
}

/* ========================================
   Print Styles
   ======================================== */

@media print {
  .header,
  .footer,
  .btn {
    display: none;
  }

  body {
    font-size: 12pt;
    line-height: 1.5;
  }

  h1 { font-size: 24pt; }
  h2 { font-size: 18pt; }
  h3 { font-size: 14pt; }
}