/* ========================================
   CSS RESET & BASE STYLES
   ======================================== */

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

/* ========================================
   CSS CUSTOM PROPERTIES (VARIABLES)
   ======================================== */

:root {
  /* Neumorphism Color Palette */
  --color-background: #E0E5EC;
  --color-surface: #E0E5EC;
  --color-text-primary: #2C3E50;
  --color-text-secondary: #5A6C7D;
  --color-accent: #6C7C93;
  --color-accent-hover: #5A6A7F;
  --color-link: #4A7BA7;
  --color-link-hover: #3A5F7D;

  /* Neumorphic Shadows */
  --shadow-light: #FFFFFF;
  --shadow-dark: #A3B1C6;
  --shadow-outset: 9px 9px 16px var(--shadow-dark), -9px -9px 16px var(--shadow-light);
  --shadow-inset: inset 6px 6px 12px var(--shadow-dark), inset -6px -6px 12px var(--shadow-light);
  --shadow-soft: 6px 6px 12px var(--shadow-dark), -6px -6px 12px var(--shadow-light);
  --shadow-button: 4px 4px 8px var(--shadow-dark), -4px -4px 8px var(--shadow-light);
  --shadow-button-pressed: inset 3px 3px 6px var(--shadow-dark), inset -3px -3px 6px var(--shadow-light);

  /* Typography */
  --font-primary: 'SF Pro Display', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue', sans-serif;
  --font-secondary: 'Nunito', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --spacing-xxl: 4rem;

  /* Border Radius */
  --radius-sm: 12px;
  --radius-md: 20px;
  --radius-lg: 30px;
  --radius-xl: 40px;
  --radius-round: 50%;

  /* Container Width */
  --container-max-width: 900px;
}

/* ========================================
   GLOBAL STYLES
   ======================================== */

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

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

.page-wrapper {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.container {
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

/* ========================================
   TYPOGRAPHY
   ======================================== */

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-secondary);
  font-weight: 700;
  line-height: 1.3;
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-md);
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; margin-top: var(--spacing-xl); }
h3 { font-size: 1.5rem; margin-top: var(--spacing-lg); }
h4 { font-size: 1.25rem; margin-top: var(--spacing-md); }

p {
  margin-bottom: var(--spacing-md);
  color: var(--color-text-secondary);
}

a {
  color: var(--color-link);
  text-decoration: none;
  transition: color 0.3s ease;
}

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

strong {
  color: var(--color-text-primary);
  font-weight: 600;
}

/* ========================================
   HERO SECTION
   ======================================== */

.hero {
  background: var(--color-surface);
  padding: var(--spacing-xxl) 0;
  text-align: center;
  box-shadow: var(--shadow-outset);
  border-radius: 0 0 var(--radius-xl) var(--radius-xl);
  margin-bottom: var(--spacing-xl);
}

.hero-title {
  font-size: 3rem;
  margin-bottom: var(--spacing-sm);
  color: var(--color-text-primary);
  text-shadow: 2px 2px 4px rgba(163, 177, 198, 0.3);
}

.hero-subtitle {
  font-size: 1.25rem;
  color: var(--color-text-secondary);
  font-weight: 400;
  margin-bottom: var(--spacing-lg);
}

.hero-divider {
  width: 80px;
  height: 4px;
  background: var(--color-surface);
  box-shadow: var(--shadow-inset);
  margin: var(--spacing-lg) auto 0;
  border-radius: var(--radius-sm);
}

/* ========================================
   MAIN CONTENT
   ======================================== */

.content {
  flex: 1;
  padding: var(--spacing-lg) 0;
}

.article-intro {
  margin-bottom: var(--spacing-xl);
}

.article-intro p:first-child {
  font-size: 1.15rem;
  line-height: 1.8;
}

.article-section {
  margin-bottom: var(--spacing-xxl);
}

/* ========================================
   NEUMORPHIC CARDS
   ======================================== */

.timeline-card,
.quote-card,
.highlight-card,
.tip-card,
.phase-card,
.definition-card {
  background: var(--color-surface);
  border-radius: var(--radius-md);
  padding: var(--spacing-lg);
  margin-bottom: var(--spacing-lg);
  box-shadow: var(--shadow-outset);
  transition: all 0.3s ease;
}

.timeline-card:hover,
.phase-card:hover,
.definition-card:hover {
  transform: translateY(-2px);
  box-shadow: 12px 12px 20px var(--shadow-dark), -12px -12px 20px var(--shadow-light);
}

.timeline-card h3,
.phase-card h4,
.definition-card h3 {
  margin-top: 0;
  margin-bottom: var(--spacing-sm);
  color: var(--color-accent);
}

.timeline-card p,
.phase-card p,
.definition-card p {
  margin-bottom: 0;
}

.definition-card p:last-child {
  margin-top: var(--spacing-sm);
  font-size: 0.95rem;
}

/* Quote Card Styling */
.quote-card {
  background: var(--color-surface);
  box-shadow: var(--shadow-inset);
  border-left: 4px solid var(--color-accent);
}

.quote-card blockquote {
  margin: 0;
}

.quote-card p {
  font-size: 1.1rem;
  font-style: italic;
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-sm);
}

.quote-card cite {
  display: block;
  text-align: right;
  font-size: 0.95rem;
  color: var(--color-accent);
  font-style: normal;
  font-weight: 600;
}

/* Highlight Card */
.highlight-card {
  background: linear-gradient(135deg, var(--color-surface) 0%, #D5DBE5 100%);
  box-shadow: var(--shadow-outset);
}

.highlight-card p {
  font-size: 1.05rem;
  color: var(--color-text-primary);
  margin-bottom: 0;
}

/* Tip Card */
.tip-card {
  background: var(--color-surface);
  box-shadow: var(--shadow-soft);
  border: 2px solid var(--color-background);
}

.tip-card p {
  margin-bottom: 0;
  color: var(--color-text-primary);
}

/* ========================================
   LISTS
   ======================================== */

.feature-list,
.constraint-list,
.strategy-list,
.action-list {
  margin: var(--spacing-lg) 0;
  padding-left: var(--spacing-lg);
}

.feature-list li,
.constraint-list li,
.strategy-list li {
  margin-bottom: var(--spacing-sm);
  color: var(--color-text-secondary);
  padding-left: var(--spacing-xs);
}

.feature-list.minimal {
  background: var(--color-surface);
  border-radius: var(--radius-md);
  padding: var(--spacing-lg);
  box-shadow: var(--shadow-inset);
  list-style-position: inside;
}

.feature-list.minimal li {
  color: var(--color-text-primary);
  font-weight: 600;
}

.action-list {
  list-style: none;
  padding-left: 0;
  counter-reset: step-counter;
}

.action-list li {
  counter-increment: step-counter;
  background: var(--color-surface);
  border-radius: var(--radius-md);
  padding: var(--spacing-lg);
  margin-bottom: var(--spacing-lg);
  box-shadow: var(--shadow-outset);
  position: relative;
}

.action-list li::before {
  content: counter(step-counter);
  position: absolute;
  top: var(--spacing-lg);
  left: var(--spacing-lg);
  width: 36px;
  height: 36px;
  background: var(--color-surface);
  border-radius: var(--radius-round);
  box-shadow: var(--shadow-inset);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  color: var(--color-accent);
  font-size: 1.1rem;
}

.action-list li strong {
  display: block;
  margin-left: 48px;
  margin-bottom: var(--spacing-sm);
  color: var(--color-text-primary);
}

.action-list li p {
  margin-left: 48px;
  margin-bottom: 0;
}

/* ========================================
   CALL-TO-ACTION SECTION
   ======================================== */

.cta-section {
  background: var(--color-surface);
  padding: var(--spacing-xxl) 0;
  margin-top: var(--spacing-xxl);
  box-shadow: var(--shadow-outset);
  border-radius: var(--radius-xl) var(--radius-xl) 0 0;
}

.cta-card {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xl);
  box-shadow: var(--shadow-soft);
}

.cta-content {
  display: flex;
  gap: var(--spacing-xl);
  align-items: center;
}

.cta-photo {
  width: 180px;
  height: 180px;
  border-radius: var(--radius-round);
  object-fit: cover;
  flex-shrink: 0;
  box-shadow: var(--shadow-outset);
  border: 4px solid var(--color-surface);
}

.cta-text h2 {
  margin-top: 0;
  margin-bottom: var(--spacing-xs);
  color: var(--color-text-primary);
}

.cta-subtitle {
  font-size: 1.1rem;
  color: var(--color-accent);
  font-weight: 600;
  margin-bottom: var(--spacing-md);
}

.cta-description {
  font-size: 1rem;
  line-height: 1.7;
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-lg);
}

.cta-button {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-md) var(--spacing-xl);
  background: var(--color-surface);
  color: var(--color-accent);
  font-weight: 600;
  font-size: 1.05rem;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-button);
  transition: all 0.3s ease;
  text-decoration: none;
}

.cta-button:hover {
  color: var(--color-accent-hover);
  box-shadow: 12px 12px 20px var(--shadow-dark), -12px -12px 20px var(--shadow-light);
  transform: translateY(-2px);
}

.cta-button:active {
  box-shadow: var(--shadow-button-pressed);
  transform: translateY(0);
}

.button-arrow {
  transition: transform 0.3s ease;
}

.cta-button:hover .button-arrow {
  transform: translateX(4px);
}

/* ========================================
   FOOTER
   ======================================== */

.page-footer {
  background: var(--color-surface);
  padding: var(--spacing-lg) 0;
  text-align: center;
  box-shadow: var(--shadow-inset);
}

.page-footer p {
  margin: 0;
  color: var(--color-text-secondary);
  font-size: 0.9rem;
}

/* ========================================
   UTILITY CLASSES
   ======================================== */

.closing-line {
  font-size: 1.1rem;
  text-align: center;
  padding: var(--spacing-lg);
  background: var(--color-surface);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-outset);
  margin-top: var(--spacing-xl);
}

/* ========================================
   RESPONSIVE DESIGN
   ======================================== */

@media (max-width: 1024px) {
  :root {
    --spacing-xxl: 3rem;
    --spacing-xl: 2.5rem;
  }

  .hero-title {
    font-size: 2.5rem;
  }

  h1 { font-size: 2.25rem; }
  h2 { font-size: 1.75rem; }
}

@media (max-width: 768px) {
  :root {
    --spacing-xxl: 2.5rem;
    --spacing-xl: 2rem;
    --spacing-lg: 1.5rem;
  }

  .hero {
    padding: var(--spacing-xl) 0;
  }

  .hero-title {
    font-size: 2rem;
  }

  .hero-subtitle {
    font-size: 1.1rem;
  }

  h1 { font-size: 2rem; }
  h2 { font-size: 1.5rem; }
  h3 { font-size: 1.25rem; }

  .cta-content {
    flex-direction: column;
    text-align: center;
  }

  .cta-photo {
    width: 150px;
    height: 150px;
  }

  .action-list li::before {
    position: static;
    margin-bottom: var(--spacing-sm);
  }

  .action-list li strong,
  .action-list li p {
    margin-left: 0;
  }

  .timeline-card,
  .quote-card,
  .highlight-card,
  .tip-card,
  .phase-card,
  .definition-card {
    padding: var(--spacing-md);
  }
}

@media (max-width: 480px) {
  html {
    font-size: 14px;
  }

  .container {
    padding: 0 var(--spacing-sm);
  }

  .hero-title {
    font-size: 1.75rem;
  }

  .cta-photo {
    width: 120px;
    height: 120px;
  }

  .cta-button {
    width: 100%;
    justify-content: center;
  }
}

/* ========================================
   PRINT STYLES
   ======================================== */

@media print {
  body {
    background: white;
    color: black;
  }

  .hero,
  .cta-section,
  .page-footer {
    box-shadow: none;
  }

  .cta-button {
    display: none;
  }

  a {
    color: black;
    text-decoration: underline;
  }

  a[href^="http"]:after {
    content: " (" attr(href) ")";
    font-size: 0.8em;
  }
}