/* ============================================================
   SANCHEZ.GLOBAL — Design Tokens & Component Styles
   Warm earth-tone scholarly portfolio
   ============================================================ */

/* --- Type Scale (fluid) --- */
:root {
  --text-xs:   clamp(0.75rem,  0.7rem  + 0.25vw, 0.875rem);
  --text-sm:   clamp(0.875rem, 0.8rem  + 0.35vw, 1rem);
  --text-base: clamp(1rem,     0.95rem + 0.25vw, 1.125rem);
  --text-lg:   clamp(1.125rem, 1rem    + 0.75vw, 1.5rem);
  --text-xl:   clamp(1.5rem,   1.2rem  + 1.25vw, 2.25rem);
  --text-2xl:  clamp(2rem,     1.2rem  + 2.5vw,  3.5rem);
  --text-3xl:  clamp(2.5rem,   1rem    + 4vw,    5rem);

  /* Spacing (4px 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;
  --space-32: 8rem;

  /* Content widths */
  --content-narrow: 640px;
  --content-default: 960px;
  --content-wide: 1200px;

  /* Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;

  /* Transitions */
  --transition-interactive: 180ms cubic-bezier(0.16, 1, 0.3, 1);

  /* Fonts */
  --font-display: 'Zodiak', 'Georgia', serif;
  --font-body: 'Satoshi', 'Helvetica Neue', sans-serif;
}

/* --- LIGHT MODE (default) --- */
:root, [data-theme="light"] {
  /* Surfaces — warm sand/cream */
  --color-bg:             #faf8f4;
  --color-surface:        #f5f1ea;
  --color-surface-2:      #fdfcfa;
  --color-surface-offset: #eee9e0;
  --color-border:         #d9d0c4;
  --color-divider:        #e4ddd3;

  /* Text — deep earth brown */
  --color-text:           #2c2419;
  --color-text-muted:     #7a6f5f;
  --color-text-faint:     #b5aa98;
  --color-text-inverse:   #faf8f4;

  /* Primary — sage green */
  --color-primary:        #5a7c5a;
  --color-primary-hover:  #476347;
  --color-primary-active: #364b36;
  --color-primary-light:  #e8f0e8;

  /* Accent — terra cotta */
  --color-accent:         #b8694a;
  --color-accent-hover:   #9e5438;
  --color-accent-light:   #f5e6de;

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(44, 36, 25, 0.06);
  --shadow-md: 0 4px 12px rgba(44, 36, 25, 0.08);
  --shadow-lg: 0 12px 32px rgba(44, 36, 25, 0.1);
}

/* --- DARK MODE --- */
[data-theme="dark"] {
  --color-bg:             #1a1714;
  --color-surface:        #231f1b;
  --color-surface-2:      #2a2622;
  --color-surface-offset: #1e1b17;
  --color-border:         #3d3731;
  --color-divider:        #332e28;

  --color-text:           #ddd5c8;
  --color-text-muted:     #9a8e7d;
  --color-text-faint:     #5e5548;
  --color-text-inverse:   #1a1714;

  --color-primary:        #7fa87f;
  --color-primary-hover:  #6b946b;
  --color-primary-active: #5a805a;
  --color-primary-light:  #2a332a;

  --color-accent:         #d4896a;
  --color-accent-hover:   #c07856;
  --color-accent-light:   #3a2a22;

  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.2);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.4);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    --color-bg:             #1a1714;
    --color-surface:        #231f1b;
    --color-surface-2:      #2a2622;
    --color-surface-offset: #1e1b17;
    --color-border:         #3d3731;
    --color-divider:        #332e28;
    --color-text:           #ddd5c8;
    --color-text-muted:     #9a8e7d;
    --color-text-faint:     #5e5548;
    --color-text-inverse:   #1a1714;
    --color-primary:        #7fa87f;
    --color-primary-hover:  #6b946b;
    --color-primary-active: #5a805a;
    --color-primary-light:  #2a332a;
    --color-accent:         #d4896a;
    --color-accent-hover:   #c07856;
    --color-accent-light:   #3a2a22;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.2);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.4);
  }
}

/* ============================================================
   LAYOUT
   ============================================================ */
.container {
  width: 100%;
  max-width: var(--content-wide);
  margin-inline: auto;
  padding-inline: var(--space-6);
}

.container--narrow {
  max-width: var(--content-default);
}

.section {
  padding-block: clamp(var(--space-12), 8vw, var(--space-24));
}

/* ============================================================
   HEADER / NAV
   ============================================================ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: color-mix(in srgb, var(--color-bg) 92%, transparent);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--color-divider);
  transition: box-shadow 300ms ease, transform 300ms ease;
}

.site-header--scrolled {
  box-shadow: var(--shadow-sm);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-block: var(--space-4);
  max-width: var(--content-wide);
  margin-inline: auto;
  padding-inline: var(--space-6);
}

.site-logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
  color: var(--color-text);
}

.site-logo svg {
  width: 36px;
  height: 36px;
}

.site-logo-text {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 500;
  letter-spacing: -0.01em;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.main-nav a {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  text-decoration: none;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  font-weight: 500;
  letter-spacing: 0.01em;
}

.main-nav a:hover,
.main-nav a.active {
  color: var(--color-text);
  background: var(--color-surface);
}

.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-md);
  color: var(--color-text-muted);
  margin-left: var(--space-2);
}

.theme-toggle:hover {
  background: var(--color-surface);
  color: var(--color-text);
}

/* Mobile nav */
.mobile-menu-btn {
  display: none;
  flex-direction: column;
  gap: 5px;
  width: 28px;
  padding: var(--space-2);
}

.mobile-menu-btn span {
  display: block;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: transform 300ms ease, opacity 200ms ease;
}

@media (max-width: 768px) {
  .mobile-menu-btn { display: flex; }
  .main-nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-divider);
    padding: var(--space-4) var(--space-6);
    gap: var(--space-1);
    box-shadow: var(--shadow-md);
  }
  .main-nav.open { display: flex; }
  .main-nav a { padding: var(--space-3) var(--space-4); width: 100%; }
}

/* ============================================================
   HERO
   ============================================================ */
.hero {
  padding-block: clamp(var(--space-16), 12vw, var(--space-32));
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at 30% 20%, var(--color-primary-light) 0%, transparent 50%),
              radial-gradient(ellipse at 70% 80%, var(--color-accent-light) 0%, transparent 50%);
  opacity: 0.4;
  pointer-events: none;
}

.hero-content {
  position: relative;
  max-width: 720px;
  margin-inline: auto;
  padding-inline: var(--space-6);
}

.hero-label {
  display: inline-block;
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: var(--space-4);
}

.hero h1 {
  font-family: var(--font-display);
  font-size: var(--text-3xl);
  font-weight: 400;
  color: var(--color-text);
  margin-bottom: var(--space-6);
  letter-spacing: -0.02em;
}

.hero-subtitle {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  max-width: 560px;
  margin-inline: auto;
  margin-bottom: var(--space-8);
  line-height: 1.7;
}

.hero-links {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-4);
  flex-wrap: wrap;
}

.hero-links a {
  font-size: var(--text-sm);
  font-weight: 500;
}

/* ============================================================
   BUTTONS / LINKS
   ============================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  font-weight: 500;
  text-decoration: none;
  transition: all var(--transition-interactive);
}

.btn--primary {
  background: var(--color-primary);
  color: var(--color-text-inverse);
}

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

.btn--outline {
  border: 1px solid var(--color-border);
  color: var(--color-text);
  background: transparent;
}

.btn--outline:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  background: var(--color-primary-light);
}

.link-arrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  color: var(--color-primary);
  text-decoration: none;
  font-weight: 500;
  font-size: var(--text-sm);
}

.link-arrow:hover {
  color: var(--color-primary-hover);
  gap: var(--space-3);
}

.link-arrow svg {
  width: 16px;
  height: 16px;
  transition: transform var(--transition-interactive);
}

.link-arrow:hover svg {
  transform: translateX(3px);
}

/* ============================================================
   ORCID BADGE
   ============================================================ */
.orcid-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  text-decoration: none;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-divider);
  background: var(--color-surface);
}

.orcid-badge:hover {
  border-color: #a6ce39;
  background: color-mix(in srgb, #a6ce39 8%, var(--color-surface));
}

.orcid-badge svg {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}

/* ============================================================
   CARDS (Research, Featured)
   ============================================================ */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--space-6);
}

.card {
  background: var(--color-surface);
  border: 1px solid var(--color-divider);
  border-radius: var(--radius-lg);
  padding: var(--space-8);
  transition: all var(--transition-interactive);
  text-decoration: none;
  color: inherit;
  display: flex;
  flex-direction: column;
}

.card:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.card-label {
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-primary);
  margin-bottom: var(--space-3);
}

.card h3 {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 500;
  color: var(--color-text);
  margin-bottom: var(--space-3);
  line-height: 1.3;
}

.card p {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.6;
  flex: 1;
}

.card-meta {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-top: var(--space-4);
  padding-top: var(--space-4);
  border-top: 1px solid var(--color-divider);
  font-size: var(--text-xs);
  color: var(--color-text-faint);
}

.card-tag {
  display: inline-block;
  padding: var(--space-1) var(--space-2);
  background: var(--color-primary-light);
  color: var(--color-primary);
  border-radius: var(--radius-sm);
  font-size: var(--text-xs);
  font-weight: 500;
}

/* ============================================================
   SECTION HEADINGS
   ============================================================ */
.section-header {
  margin-bottom: var(--space-10);
}

.section-header h2 {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 400;
  color: var(--color-text);
  margin-bottom: var(--space-3);
}

.section-header p {
  font-size: var(--text-base);
  color: var(--color-text-muted);
}

.section-divider {
  width: 48px;
  height: 2px;
  background: var(--color-primary);
  border-radius: 2px;
  margin-bottom: var(--space-4);
}

/* ============================================================
   RESEARCH / JOURNAL PAGE
   ============================================================ */
.paper-header {
  padding-block: clamp(var(--space-12), 8vw, var(--space-20));
  border-bottom: 1px solid var(--color-divider);
}

.paper-header h1 {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 400;
  margin-bottom: var(--space-4);
  max-width: 800px;
}

.paper-meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
  align-items: center;
  margin-bottom: var(--space-4);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

.paper-meta-item {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.paper-meta-item svg {
  width: 16px;
  height: 16px;
  color: var(--color-text-faint);
}

.paper-body {
  max-width: 720px;
  padding-block: var(--space-10);
}

.paper-body h2 {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 500;
  color: var(--color-text);
  margin-top: var(--space-10);
  margin-bottom: var(--space-4);
  padding-bottom: var(--space-2);
  border-bottom: 1px solid var(--color-divider);
}

.paper-body h2:first-child {
  margin-top: 0;
}

.paper-body p {
  margin-bottom: var(--space-4);
  color: var(--color-text);
  line-height: 1.75;
}

.paper-body ul, .paper-body ol {
  margin-bottom: var(--space-4);
  padding-left: var(--space-6);
}

.paper-body li {
  margin-bottom: var(--space-2);
  line-height: 1.7;
  color: var(--color-text);
}

.paper-keywords {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-bottom: var(--space-6);
}

.paper-keywords span {
  background: var(--color-surface);
  border: 1px solid var(--color-divider);
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-sm);
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}

.paper-citation {
  background: var(--color-surface);
  border: 1px solid var(--color-divider);
  border-left: 3px solid var(--color-primary);
  padding: var(--space-6);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  margin-top: var(--space-10);
}

.paper-citation p {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.6;
  margin-bottom: 0;
}

.paper-citation strong {
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-text-faint);
  display: block;
  margin-bottom: var(--space-2);
}

/* ============================================================
   CV PAGE
   ============================================================ */
.cv-section {
  margin-bottom: var(--space-12);
}

.cv-section h2 {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 500;
  margin-bottom: var(--space-6);
  padding-bottom: var(--space-3);
  border-bottom: 2px solid var(--color-primary);
  color: var(--color-text);
}

.cv-entry {
  margin-bottom: var(--space-6);
  padding-left: var(--space-6);
  border-left: 1px solid var(--color-divider);
  position: relative;
}

.cv-entry::before {
  content: '';
  position: absolute;
  left: -4px;
  top: 6px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--color-primary);
}

.cv-entry h3 {
  font-size: var(--text-base);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--space-1);
}

.cv-entry .cv-date {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  margin-bottom: var(--space-2);
}

.cv-entry p, .cv-entry li {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.6;
}

.cv-list {
  list-style: none;
  padding: 0;
}

.cv-list li {
  padding: var(--space-2) 0;
  border-bottom: 1px solid var(--color-divider);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: var(--space-4);
}

.cv-list li:last-child { border-bottom: none; }

.cv-list .cv-org { color: var(--color-text); font-weight: 500; }
.cv-list .cv-role { color: var(--color-text-faint); font-size: var(--text-xs); }

/* ============================================================
   CONTACT
   ============================================================ */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--space-6);
}

.contact-item {
  background: var(--color-surface);
  border: 1px solid var(--color-divider);
  border-radius: var(--radius-lg);
  padding: var(--space-8);
  text-align: center;
  text-decoration: none;
  color: inherit;
  transition: all var(--transition-interactive);
}

.contact-item:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-md);
}

.contact-item svg {
  width: 32px;
  height: 32px;
  margin: 0 auto var(--space-4);
  color: var(--color-primary);
}

.contact-item h3 {
  font-size: var(--text-sm);
  font-weight: 600;
  margin-bottom: var(--space-2);
}

.contact-item p {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

/* ============================================================
   FOOTER
   ============================================================ */
.site-footer {
  border-top: 1px solid var(--color-divider);
  padding-block: var(--space-10);
  margin-top: var(--space-16);
}

.footer-inner {
  max-width: var(--content-wide);
  margin-inline: auto;
  padding-inline: var(--space-6);
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-4);
}

.footer-left {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
}

.footer-left a {
  color: var(--color-text-faint);
  text-decoration: none;
}

.footer-left a:hover {
  color: var(--color-text-muted);
}

.footer-links {
  display: flex;
  gap: var(--space-4);
}

.footer-links a {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  text-decoration: none;
}

.footer-links a:hover {
  color: var(--color-primary);
}

/* ============================================================
   ABOUT PAGE
   ============================================================ */
.about-intro {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-10);
  align-items: start;
}

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

.about-sidebar {
  background: var(--color-surface);
  border: 1px solid var(--color-divider);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
}

.about-sidebar h3 {
  font-family: var(--font-display);
  font-size: var(--text-base);
  font-weight: 500;
  margin-bottom: var(--space-4);
  color: var(--color-text);
}

.about-sidebar ul {
  list-style: none;
  padding: 0;
}

.about-sidebar li {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  padding: var(--space-2) 0;
  border-bottom: 1px solid var(--color-divider);
}

.about-sidebar li:last-child { border-bottom: none; }

.membership-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--space-4);
}

.membership-item {
  padding: var(--space-4);
  border: 1px solid var(--color-divider);
  border-radius: var(--radius-md);
  background: var(--color-surface);
}

.membership-item h4 {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--space-1);
}

.membership-item p {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
}

/* ============================================================
   ANIMATIONS (reveal on scroll)
   ============================================================ */
.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 600ms cubic-bezier(0.16, 1, 0.3, 1),
              transform 600ms cubic-bezier(0.16, 1, 0.3, 1);
}

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

/* Staggered children */
.reveal-stagger > * {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 500ms cubic-bezier(0.16, 1, 0.3, 1),
              transform 500ms cubic-bezier(0.16, 1, 0.3, 1);
}

.reveal-stagger.visible > *:nth-child(1) { transition-delay: 0ms; opacity: 1; transform: translateY(0); }
.reveal-stagger.visible > *:nth-child(2) { transition-delay: 80ms; opacity: 1; transform: translateY(0); }
.reveal-stagger.visible > *:nth-child(3) { transition-delay: 160ms; opacity: 1; transform: translateY(0); }
.reveal-stagger.visible > *:nth-child(4) { transition-delay: 240ms; opacity: 1; transform: translateY(0); }
.reveal-stagger.visible > *:nth-child(5) { transition-delay: 320ms; opacity: 1; transform: translateY(0); }
.reveal-stagger.visible > *:nth-child(6) { transition-delay: 400ms; opacity: 1; transform: translateY(0); }

/* ============================================================
   UTILITIES
   ============================================================ */
.text-center { text-align: center; }
.text-muted { color: var(--color-text-muted); }
.mt-8 { margin-top: var(--space-8); }
.mt-12 { margin-top: var(--space-12); }
.mb-4 { margin-bottom: var(--space-4); }
.mb-6 { margin-bottom: var(--space-6); }
.mb-8 { margin-bottom: var(--space-8); }

/* Print styles */
@media print {
  .site-header, .site-footer, .theme-toggle, .mobile-menu-btn { display: none; }
  body { color: #000; background: #fff; }
  .hero::before { display: none; }
  a { color: #000; text-decoration: underline; }
}