/* ==========================================================================
   Design System & Tokens
   Strict Minimalist / Editorial Theme for Nguyễn Hữu Trường
   ========================================================================== */

:root {
  /* Strict Palette */
  --background: #F4F1EA;
  --surface: #EBE7DE;
  --text-primary: #181817;
  --text-secondary: #66645F;
  --border: #CBC6BB;
  --accent: #315C4C;

  /* Typography */
  --font-family: 'Inter', Arial, sans-serif;

  /* Spacing & Container */
  --max-width: 1200px;
  --container-padding: 48px;

  /* Constrained Radii */
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;
}

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

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
  background-color: var(--background);
  color: var(--text-primary);
}

body {
  font-family: var(--font-family);
  background-color: var(--background);
  color: var(--text-primary);
  line-height: 1.6;
  font-size: 17px;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

/* ==========================================================================
   Header & Sticky Navigation
   ========================================================================== */

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: var(--background);
  border-bottom: 1px solid var(--border);
  transition: border-color 0.2s ease;
}

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

.brand-link {
  font-size: 16px;
  font-weight: 500;
  color: var(--text-primary);
  text-decoration: none;
  letter-spacing: -0.01em;
  transition: color 0.2s ease;
}

.brand-link:hover,
.brand-link:focus-visible {
  color: var(--accent);
}

.nav-links {
  display: flex;
  list-style: none;
  gap: 32px;
}

.nav-link {
  font-size: 15px;
  color: var(--text-secondary);
  text-decoration: none;
  transition: color 0.2s ease;
}

.nav-link:hover,
.nav-link:focus-visible,
.nav-link.is-active {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 4px;
}

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

.hero-section {
  min-height: 82vh;
  display: flex;
  align-items: center;
  padding-top: 60px;
  padding-bottom: 80px;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr 380px;
  gap: 64px;
  align-items: center;
}

.hero-greeting {
  font-size: 15px;
  color: var(--text-secondary);
  margin-bottom: 16px;
  letter-spacing: 0.02em;
}

.hero-name {
  font-size: clamp(48px, 6.5vw, 92px);
  font-weight: 600;
  line-height: 1.05;
  letter-spacing: -0.025em;
  color: var(--text-primary);
  margin-bottom: 24px;
}

.hero-role {
  font-size: 20px;
  font-weight: 400;
  color: var(--text-primary);
  margin-bottom: 20px;
  line-height: 1.4;
}

.hero-bio {
  font-size: 17px;
  line-height: 1.65;
  color: var(--text-secondary);
  max-width: 540px;
  margin-bottom: 36px;
}

.hero-actions {
  display: flex;
  gap: 32px;
}

.text-arrow-link {
  font-size: 16px;
  font-weight: 500;
  color: var(--text-primary);
  text-decoration: underline;
  text-underline-offset: 4px;
  text-decoration-color: var(--border);
  transition: color 0.2s ease, text-decoration-color 0.2s ease;
}

.text-arrow-link:hover,
.text-arrow-link:focus-visible {
  color: var(--accent);
  text-decoration-color: var(--accent);
}

/* Hero Portrait Media */
.portrait-figure {
  width: 100%;
  max-width: 380px;
}

.portrait-container {
  width: 100%;
  aspect-ratio: 4 / 5;
  background-color: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.portrait-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: opacity 0.2s ease;
}

.portrait-img:hover {
  opacity: 0.95;
}

.portrait-placeholder {
  display: flex;
  width: 100%;
  height: 100%;
  background-color: var(--surface);
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 8px;
}

.placeholder-initials {
  font-size: 32px;
  font-weight: 500;
  color: var(--text-secondary);
  letter-spacing: 0.08em;
}

.placeholder-label {
  font-size: 12px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-secondary);
}

.portrait-caption {
  font-size: 13px;
  color: var(--text-secondary);
  margin-top: 12px;
  letter-spacing: 0.01em;
}

/* ==========================================================================
   General Section Layout & Headers
   ========================================================================== */

.section {
  padding-top: 120px;
  padding-bottom: 120px;
}

.section-meta {
  margin-bottom: 40px;
}

.section-index {
  display: block;
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--text-secondary);
  margin-bottom: 12px;
}

.section-heading {
  font-size: clamp(32px, 3.8vw, 44px);
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  line-height: 1.2;
}

/* ==========================================================================
   01 — About Section
   ========================================================================== */

.about-body {
  max-width: 700px;
}

.about-body p {
  font-size: 18px;
  line-height: 1.7;
  color: var(--text-primary);
  margin-bottom: 24px;
}

.about-body p:last-child {
  margin-bottom: 0;
}

/* ==========================================================================
   Statement Section (Visual Pacing)
   ========================================================================== */

.statement-section {
  padding-top: 90px;
  padding-bottom: 90px;
}

.statement-quote {
  font-size: clamp(28px, 4vw, 54px);
  font-weight: 500;
  line-height: 1.25;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  max-width: 900px;
}

/* ==========================================================================
   02 — Info Section & Minimal Data Table
   ========================================================================== */

.info-grid {
  display: grid;
  grid-template-columns: 1.35fr 1fr;
  gap: 72px;
  align-items: start;
  margin-top: 36px;
}

.data-table {
  width: 100%;
}

.contact-section .data-table {
  max-width: 800px;
}

.data-row {
  display: grid;
  grid-template-columns: 180px 1fr;
  padding-top: 20px;
  padding-bottom: 20px;
  border-top: 1px solid var(--border);
  align-items: baseline;
}

.data-table .data-row:last-child {
  border-bottom: 1px solid var(--border);
}

.data-label {
  font-size: 15px;
  color: var(--text-secondary);
  font-weight: 400;
}

.data-value {
  font-size: 16px;
  color: var(--text-primary);
  font-weight: 500;
}

/* Interests Column (Right Side, Listed Down) */
.interests-col {
  padding-top: 0;
}

.interests-title {
  font-size: 16px;
  font-weight: 500;
  letter-spacing: -0.01em;
  color: var(--text-primary);
  margin-bottom: 20px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border);
}

.interests-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.interests-list li {
  font-size: 16px;
  color: var(--text-secondary);
  line-height: 1.5;
  transition: color 0.2s ease;
}

.interests-list li:hover {
  color: var(--text-primary);
}

/* ==========================================================================
   03 — Contact Section
   ========================================================================== */

.contact-intro {
  font-size: 18px;
  color: var(--text-secondary);
  margin-bottom: 32px;
}

.editorial-link {
  color: var(--text-primary);
  text-decoration: underline;
  text-underline-offset: 4px;
  text-decoration-color: var(--border);
  transition: color 0.2s ease, text-decoration-color 0.2s ease;
}

.editorial-link:hover,
.editorial-link:focus-visible {
  color: var(--accent);
  text-decoration-color: var(--accent);
}

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

.site-footer {
  border-top: 1px solid var(--border);
  padding-top: 48px;
  padding-bottom: 48px;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 14px;
  color: var(--text-secondary);
}

/* ==========================================================================
   Subtle Reveal Animation
   ========================================================================== */

.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* Focus State for Accessibility */
a:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

/* ==========================================================================
   Responsive Breakpoints
   ========================================================================== */

@media (max-width: 960px) {
  :root {
    --container-padding: 32px;
  }

  .hero-grid {
    grid-template-columns: 1fr 300px;
    gap: 40px;
  }

  .info-grid {
    grid-template-columns: 1.2fr 1fr;
    gap: 40px;
  }
}

@media (max-width: 768px) {
  :root {
    --container-padding: 20px;
  }

  .section {
    padding-top: 80px;
    padding-bottom: 80px;
  }

  .hero-section {
    min-height: auto;
    padding-top: 48px;
    padding-bottom: 64px;
  }

  .hero-grid {
    grid-template-columns: 1fr;
    gap: 48px;
  }

  .info-grid {
    grid-template-columns: 1fr;
    gap: 48px;
  }

  .hero-actions {
    gap: 24px;
  }

  .portrait-figure {
    max-width: 280px;
  }

  .data-row {
    grid-template-columns: 1fr;
    gap: 4px;
    padding-top: 16px;
    padding-bottom: 16px;
  }

  .footer-inner {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
  }
}

/* ==========================================================================
   Accessibility: Reduced Motion
   ========================================================================== */

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition: none !important;
    animation: none !important;
  }

  .reveal {
    opacity: 1 !important;
    transform: none !important;
  }
}