/* ============================================================
   DESIGN TOKENS
   ============================================================ */

:root {
  /* Type Scale */
  --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);

  /* Fonts */
  --font-display: 'DM Serif Display', 'Georgia', serif;
  --font-body: 'DM Sans', 'Helvetica Neue', sans-serif;

  /* 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;
  --space-32: 8rem;

  /* Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-full: 9999px;

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

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

/* ============================================================
   COLOR — Authoritative Slate + Deep Blue Accent
   ============================================================ */

:root, [data-theme="light"] {
  --color-bg:             #f5f5f3;
  --color-surface:        #ffffff;
  --color-surface-2:      #fafaf8;
  --color-surface-offset: #ededeb;
  --color-divider:        #d8d8d4;
  --color-border:         #c8c8c3;
  --color-text:           #1a1a1a;
  --color-text-muted:     #6b6b6b;
  --color-text-faint:     #a0a0a0;
  --color-text-inverse:   #f5f5f3;
  --color-primary:        #1b3a5c;
  --color-primary-hover:  #14304d;
  --color-primary-active: #0e243a;
  --color-primary-highlight: #dce4ed;

  --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
  --shadow-lg: 0 12px 32px rgba(0,0,0,0.12);
}

[data-theme="dark"] {
  --color-bg:             #111214;
  --color-surface:        #1a1b1e;
  --color-surface-2:      #1f2023;
  --color-surface-offset: #16171a;
  --color-divider:        #2a2b2e;
  --color-border:         #3a3b3e;
  --color-text:           #d4d4d4;
  --color-text-muted:     #8a8a8a;
  --color-text-faint:     #5a5a5a;
  --color-text-inverse:   #1a1a1a;
  --color-primary:        #6b9fd4;
  --color-primary-hover:  #5590c8;
  --color-primary-active: #4080bb;
  --color-primary-highlight: #1e2a38;

  --shadow-sm: 0 1px 2px rgba(0,0,0,0.3);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.4);
  --shadow-lg: 0 12px 32px rgba(0,0,0,0.5);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    --color-bg:             #111214;
    --color-surface:        #1a1b1e;
    --color-surface-2:      #1f2023;
    --color-surface-offset: #16171a;
    --color-divider:        #2a2b2e;
    --color-border:         #3a3b3e;
    --color-text:           #d4d4d4;
    --color-text-muted:     #8a8a8a;
    --color-text-faint:     #5a5a5a;
    --color-text-inverse:   #1a1a1a;
    --color-primary:        #6b9fd4;
    --color-primary-hover:  #5590c8;
    --color-primary-active: #4080bb;
    --color-primary-highlight: #1e2a38;

    --shadow-sm: 0 1px 2px rgba(0,0,0,0.3);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.4);
    --shadow-lg: 0 12px 32px rgba(0,0,0,0.5);
  }
}

/* ============================================================
   LAYOUT
   ============================================================ */

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

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

/* ============================================================
   HEADER
   ============================================================ */

.header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: oklch(from var(--color-bg) l c h / 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-divider);
  padding: var(--space-4) 0;
}

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

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

.header__logo-mark {
  color: var(--color-primary);
}

.header__logo-text {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  letter-spacing: -0.01em;
}

.header__nav {
  display: flex;
  align-items: center;
  gap: var(--space-6);
}

.header__nav a {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  text-decoration: none;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  font-weight: 500;
}

.header__nav a:hover {
  color: var(--color-text);
}

.theme-toggle {
  padding: var(--space-2);
  color: var(--color-text-muted);
  border-radius: var(--radius-sm);
}

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

/* Mobile nav */
.mobile-menu-btn {
  display: none;
  padding: var(--space-2);
  color: var(--color-text);
}

@media (max-width: 768px) {
  .mobile-menu-btn { display: block; }
  .header__nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-divider);
    flex-direction: column;
    padding: var(--space-6);
    gap: var(--space-4);
  }
  .header__nav.is-open { display: flex; }
}

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

.hero {
  padding: clamp(var(--space-16), 10vw, var(--space-32)) 0 clamp(var(--space-12), 8vw, var(--space-24));
  text-align: center;
}

.hero__name {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  color: var(--color-text);
  margin-bottom: var(--space-3);
  letter-spacing: -0.02em;
}

.hero__title {
  font-size: var(--text-lg);
  color: var(--color-primary);
  font-weight: 500;
  margin-bottom: var(--space-6);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

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

.hero__divider {
  width: 48px;
  height: 2px;
  background: var(--color-primary);
  margin: var(--space-8) auto 0;
}

/* ============================================================
   SECTIONS
   ============================================================ */

.section {
  padding: clamp(var(--space-12), 6vw, var(--space-24)) 0;
}

.section--alt {
  background: var(--color-surface);
}

.section__header {
  text-align: center;
  margin-bottom: clamp(var(--space-8), 4vw, var(--space-16));
}

.section__title {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  color: var(--color-text);
  margin-bottom: var(--space-3);
}

.section__subtitle {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 500;
  margin-bottom: var(--space-2);
}

/* ============================================================
   ABOUT
   ============================================================ */

.about__content {
  max-width: var(--content-narrow);
  margin-inline: auto;
}

.about__content p {
  color: var(--color-text-muted);
  margin-bottom: var(--space-4);
  line-height: 1.7;
}

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

/* ============================================================
   AREAS GRID
   ============================================================ */

.areas-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-6);
}

@media (max-width: 640px) {
  .areas-grid {
    grid-template-columns: 1fr;
  }
}

.area-card {
  padding: var(--space-8);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-surface);
  transition: box-shadow var(--transition-interactive),
              border-color var(--transition-interactive);
}

.area-card:hover {
  box-shadow: var(--shadow-md);
  border-color: var(--color-primary-highlight);
}

.area-card__icon {
  width: 40px;
  height: 40px;
  color: var(--color-primary);
  margin-bottom: var(--space-4);
}

.area-card__title {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  color: var(--color-text);
  margin-bottom: var(--space-2);
}

.area-card__desc {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.65;
}

/* ============================================================
   EXPERIENCE
   ============================================================ */

.experience-list {
  max-width: var(--content-narrow);
  margin-inline: auto;
}

.experience-item {
  padding: var(--space-6) 0;
  border-bottom: 1px solid var(--color-divider);
}

.experience-item:last-child {
  border-bottom: none;
}

.experience-item__header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: var(--space-2);
  flex-wrap: wrap;
  gap: var(--space-2);
}

.experience-item__role {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  color: var(--color-text);
}

.experience-item__period {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.experience-item__company {
  font-size: var(--text-sm);
  color: var(--color-primary);
  font-weight: 500;
  margin-bottom: var(--space-2);
}

.experience-item__desc {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.65;
}

/* ============================================================
   CONSULTING
   ============================================================ */

.consulting__content {
  max-width: var(--content-narrow);
  margin-inline: auto;
  text-align: center;
}

.consulting__statement {
  color: var(--color-text-muted);
  line-height: 1.75;
  margin-bottom: var(--space-6);
  max-width: 600px;
  margin-inline: auto;
}

.consulting__cta {
  color: var(--color-text);
  font-weight: 500;
  margin-bottom: var(--space-8);
  line-height: 1.7;
}

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

.consulting__link {
  display: inline-flex;
  align-items: center;
  font-size: var(--text-sm);
  color: var(--color-primary);
  text-decoration: none;
  padding: var(--space-3) var(--space-6);
  border: 1px solid var(--color-primary);
  border-radius: var(--radius-md);
  font-weight: 500;
  transition: background var(--transition-interactive),
              color var(--transition-interactive);
}

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

/* ============================================================
   CONTACT
   ============================================================ */

.contact {
  text-align: center;
}

.contact__text {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  margin-bottom: var(--space-6);
  max-width: 480px;
  margin-inline: auto;
}

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

.contact__link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  color: var(--color-primary);
  text-decoration: none;
  padding: var(--space-3) var(--space-6);
  border: 1px solid var(--color-primary);
  border-radius: var(--radius-md);
  font-weight: 500;
}

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

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

.footer {
  padding: var(--space-8) 0;
  border-top: 1px solid var(--color-divider);
  text-align: center;
}

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

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

.footer__attribution a {
  color: var(--color-text-muted);
  text-decoration: none;
}

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

/* ============================================================
   REVEAL ANIMATIONS
   ============================================================ */

.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.6s cubic-bezier(0.16, 1, 0.3, 1),
              transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

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