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

:root {
  --color-bg: #0a0a0c;
  --color-surface: #161618;
  --color-border: rgba(255, 255, 255, 0.06);
  --color-text: #e8e8ec;
  --color-text-secondary: #87878f;
  --color-text-muted: #50505a;
  --color-accent: #b4b8ce;
  --color-accent-strong: #cfd3e8;

  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

  --fs-sm: 0.875rem;
  --fs-base: 1rem;
  --fs-md: 1.125rem;
  --fs-lg: 1.25rem;
  --fs-xl: 1.5rem;
  --fs-2xl: 2rem;
  --fs-3xl: 2.5rem;
  --fs-4xl: clamp(2.5rem, 5vw, 3.5rem);

  --fw-light: 300;
  --fw-regular: 400;
  --fw-medium: 500;
  --fw-semibold: 600;

  --lh-snug: 1.3;
  --lh-normal: 1.7;

  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  --space-4xl: 6rem;

  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-full: 9999px;

  --transition: 200ms ease;
  --container-max: 900px;

  --nav-bg: rgba(10, 10, 12, 0.88);
}

[data-theme="light"] {
  --color-bg: #fafafa;
  --color-surface: #ffffff;
  --color-border: rgba(0, 0, 0, 0.06);
  --color-text: #141414;
  --color-text-secondary: #555;
  --color-text-muted: #999;
  --color-accent: #2c2c3a;
  --color-accent-strong: #1a1a28;
  --nav-bg: rgba(250, 250, 250, 0.88);
}


/* ========================================
   RESET & BASE
   ======================================== */

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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
}

body {
  font-family: var(--font-sans);
  font-size: var(--fs-base);
  line-height: var(--lh-normal);
  color: var(--color-text);
  background: var(--color-bg);
  transition: color 0.3s, background-color 0.3s;
}

a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }
img { max-width: 100%; display: block; }
button { border: none; background: none; cursor: pointer; font: inherit; color: inherit; }
::selection { background: var(--color-accent); color: var(--color-bg); opacity: 0.9; }


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

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

.section {
  padding: var(--space-4xl) 0;
}

.section__title {
  font-size: var(--fs-2xl);
  font-weight: var(--fw-semibold);
  margin-bottom: var(--space-2xl);
}

.divider {
  border: none;
  border-top: 1px solid var(--color-border);
  max-width: var(--container-max);
  margin: 0 auto;
}


/* ========================================
   NAVIGATION
   ======================================== */

.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: var(--space-md) 0;
  transition: background var(--transition), backdrop-filter var(--transition);
}

.nav--scrolled,
.nav--solid {
  background: var(--nav-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--color-border);
}

.nav__inner {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-xl);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav__logo {
  display: flex;
  align-items: center;
}

.nav__sig {
  height: 96px;
  width: auto;
  transition: opacity var(--transition);
  filter: invert(0);
}

:root .nav__sig {
  filter: invert(1);
}

[data-theme="light"] .nav__sig {
  filter: invert(0);
}

.nav__logo:hover .nav__sig {
  opacity: 0.7;
}

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

.nav__link {
  font-size: var(--fs-sm);
  color: var(--color-text-secondary);
  transition: color var(--transition);
}

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

.nav__right-mobile {
  display: none;
  align-items: center;
  gap: var(--space-md);
}

.nav__toggle {
  display: none;
  flex-direction: column;
  gap: 6px;
  padding: 4px;
}

.nav__toggle span {
  display: block;
  width: 22px;
  height: 1.5px;
  background: var(--color-text);
  transition: transform var(--transition), opacity var(--transition);
}

.nav__toggle--active span:first-child {
  transform: translateY(3.75px) rotate(45deg);
}

.nav__toggle--active span:last-child {
  transform: translateY(-3.75px) rotate(-45deg);
}


/* ========================================
   MOBILE MENU
   ======================================== */

.mobile-menu {
  position: fixed;
  inset: 0;
  z-index: 99;
  background: var(--nav-bg);
  backdrop-filter: blur(30px);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s;
}

.mobile-menu--open {
  opacity: 1;
  pointer-events: all;
}

.mobile-menu__inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2xl);
}

.mobile-menu__link {
  font-size: var(--fs-2xl);
  font-weight: var(--fw-light);
  transition: color var(--transition);
}

.mobile-menu__link:hover {
  color: var(--color-accent);
}


/* ========================================
   THEME TOGGLE
   ======================================== */

.theme-toggle {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--color-border);
  color: var(--color-text-secondary);
  transition: color var(--transition), border-color var(--transition);
  flex-shrink: 0;
  position: relative;
}

.theme-toggle:hover {
  color: var(--color-text);
  border-color: var(--color-text-muted);
}

.theme-toggle__sun,
.theme-toggle__moon {
  position: absolute;
  transition: opacity 0.2s, transform 0.2s;
}

.theme-toggle__moon { opacity: 1; transform: scale(1); }
.theme-toggle__sun { opacity: 0; transform: scale(0.5); }

[data-theme="light"] .theme-toggle__moon { opacity: 0; transform: scale(0.5); }
[data-theme="light"] .theme-toggle__sun { opacity: 1; transform: scale(1); }


/* ========================================
   INTRO (HERO REPLACEMENT)
   ======================================== */

.intro {
  padding: 160px 0 var(--space-4xl);
}

.intro__photo {
  width: 140px;
  height: 140px;
  border-radius: 50%;
  object-fit: cover;
  margin-bottom: var(--space-xl);
  border: 2px solid var(--color-border);
}

.intro__greeting {
  font-size: var(--fs-4xl);
  font-weight: var(--fw-semibold);
  line-height: var(--lh-snug);
  margin-bottom: var(--space-lg);
}

.intro__tagline {
  font-size: var(--fs-lg);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-2xl);
}

.intro__bio {
  font-size: var(--fs-md);
  color: var(--color-text-secondary);
  line-height: var(--lh-normal);
  max-width: 680px;
}


/* ========================================
   PROJECTS (WORK)
   ======================================== */

.project {
  display: block;
  margin-bottom: var(--space-3xl);
  transition: opacity var(--transition);
}

a.project:hover {
  opacity: 0.85;
}

.project:last-child {
  margin-bottom: 0;
}

.project__image {
  aspect-ratio: 16 / 9;
  border-radius: var(--radius-lg);
  display: flex;
  align-items: flex-end;
  justify-content: flex-start;
  overflow: hidden;
  margin-bottom: var(--space-lg);
  position: relative;
}

.project__image-text {
  font-size: var(--fs-xl);
  font-weight: var(--fw-semibold);
  color: rgba(255, 255, 255, 0.9);
  padding: var(--space-xl);
  line-height: var(--lh-snug);
}

.project__image-text em {
  font-style: normal;
  color: #b4b8ce;
}

.project__image-label {
  font-size: var(--fs-sm);
  font-weight: var(--fw-medium);
  color: rgba(255, 255, 255, 0.7);
  padding: var(--space-lg) var(--space-xl);
  letter-spacing: 0.04em;
}

.project__title {
  font-size: var(--fs-xl);
  font-weight: var(--fw-semibold);
  margin-bottom: var(--space-sm);
}

.project__desc {
  font-size: var(--fs-base);
  color: var(--color-text-secondary);
  line-height: var(--lh-normal);
  max-width: 640px;
}

.project__cta {
  display: inline-block;
  font-size: var(--fs-sm);
  font-weight: var(--fw-medium);
  color: var(--color-accent);
  margin-top: var(--space-md);
}


/* ========================================
   LEADERSHIP PRINCIPLES
   ======================================== */

.principles {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-2xl);
}

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

.principle__icon {
  font-size: 1.75rem;
  color: var(--color-accent);
  display: block;
  margin-bottom: var(--space-md);
}

.principle__title {
  font-size: var(--fs-lg);
  font-weight: var(--fw-semibold);
  margin-bottom: var(--space-sm);
}

.principle__desc {
  font-size: var(--fs-sm);
  color: var(--color-text-secondary);
  line-height: var(--lh-normal);
}


/* ========================================
   JOURNEY (WHERE I'VE BEEN)
   ======================================== */

.journey__item {
  display: grid;
  grid-template-columns: 140px 1fr auto;
  gap: var(--space-md);
  padding: var(--space-lg) 0;
  border-bottom: 1px solid var(--color-border);
  align-items: baseline;
}

.journey__item:first-child {
  border-top: 1px solid var(--color-border);
}

.journey__company {
  font-weight: var(--fw-semibold);
  font-size: var(--fs-sm);
}

.journey__role {
  font-size: var(--fs-sm);
  color: var(--color-text-secondary);
}

.journey__period {
  font-size: var(--fs-sm);
  color: var(--color-text-muted);
  text-align: right;
}


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

.contact__item {
  display: flex;
  gap: var(--space-xl);
  align-items: baseline;
}

.contact__label {
  font-size: var(--fs-sm);
  color: var(--color-text-muted);
  min-width: 80px;
}

.contact__value {
  font-size: var(--fs-base);
  color: var(--color-accent);
  transition: opacity var(--transition);
}

.contact__value:hover {
  opacity: 0.7;
}


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

.footer {
  padding: var(--space-2xl) 0;
  border-top: 1px solid var(--color-border);
}

.footer__copy {
  font-size: 0.75rem;
  color: var(--color-text-muted);
}


/* ========================================
   REVEAL ANIMATION
   ======================================== */

.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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


/* ========================================
   CASE STUDY PAGE
   ======================================== */

.cs {
  padding-top: 80px;
}

.cs__header {
  padding: var(--space-3xl) 0;
  border-bottom: 1px solid var(--color-border);
}

.cs__back {
  font-size: var(--fs-sm);
  color: var(--color-text-muted);
  transition: color var(--transition);
  display: inline-block;
  margin-bottom: var(--space-2xl);
}

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

.cs__title {
  font-size: var(--fs-4xl);
  font-weight: var(--fw-semibold);
  line-height: var(--lh-snug);
  margin-bottom: var(--space-lg);
}

.cs__title-accent {
  color: var(--color-accent-strong);
}

.cs__subtitle {
  font-size: var(--fs-md);
  color: var(--color-text-secondary);
  max-width: 600px;
  line-height: var(--lh-normal);
}

.cs__meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2xl);
  padding: var(--space-xl) 0;
  border-bottom: 1px solid var(--color-border);
}

.cs__meta-label {
  display: block;
  font-size: 0.75rem;
  font-weight: var(--fw-semibold);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: var(--space-xs);
}

.cs__meta-value {
  font-size: var(--fs-sm);
  color: var(--color-text);
}

.cs__narrative {
  padding: var(--space-3xl) 0;
}

.cs__narrative + .cs__narrative {
  border-top: 1px solid var(--color-border);
}

.cs__heading {
  font-size: var(--fs-2xl);
  font-weight: var(--fw-semibold);
  margin-bottom: var(--space-lg);
  line-height: var(--lh-snug);
}

.cs__body {
  font-size: var(--fs-md);
  color: var(--color-text-secondary);
  line-height: var(--lh-normal);
  margin-bottom: var(--space-lg);
  max-width: 680px;
}

.cs__body:last-child {
  margin-bottom: 0;
}

.cs__figure {
  margin: 0;
  padding: var(--space-lg) 0;
}

.cs__img-placeholder {
  width: 100%;
  aspect-ratio: 16 / 9;
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.cs__img-placeholder img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: var(--radius-lg);
}

.cs__img-label {
  font-size: var(--fs-sm);
  color: rgba(255, 255, 255, 0.4);
  text-align: center;
  padding: var(--space-xl);
}

.cs__figcaption {
  font-size: var(--fs-sm);
  color: var(--color-text-muted);
  margin-top: var(--space-md);
  line-height: var(--lh-normal);
}

.cs__metrics {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-xl);
  margin-top: var(--space-2xl);
  padding-top: var(--space-2xl);
  border-top: 1px solid var(--color-border);
}

@media (min-width: 640px) {
  .cs__metrics {
    grid-template-columns: repeat(3, 1fr);
  }
}

.cs__metric-value {
  display: block;
  font-size: var(--fs-xl);
  font-weight: var(--fw-semibold);
  color: var(--color-accent);
  margin-bottom: var(--space-xs);
}

.cs__metric-label {
  font-size: var(--fs-sm);
  color: var(--color-text-secondary);
  line-height: var(--lh-normal);
}

.cs__footer-nav {
  display: flex;
  justify-content: space-between;
  padding: var(--space-2xl) 0;
  border-top: 1px solid var(--color-border);
}

.cs__footer-link {
  font-size: var(--fs-sm);
  color: var(--color-text-muted);
  transition: color var(--transition);
}

.cs__footer-link:hover {
  color: var(--color-accent);
}


/* ========================================
   RESUME PAGE
   ======================================== */

.resume {
  padding-top: 80px;
}

.resume__header {
  padding: var(--space-3xl) 0 var(--space-2xl);
  border-bottom: 1px solid var(--color-border);
}

.resume__name {
  font-size: var(--fs-4xl);
  font-weight: var(--fw-semibold);
  line-height: var(--lh-snug);
}

.resume__role {
  font-size: var(--fs-md);
  color: var(--color-accent);
  margin-top: var(--space-xs);
}

.resume__header-meta {
  display: flex;
  gap: var(--space-xl);
  margin-top: var(--space-md);
}

.resume__contact-item {
  font-size: var(--fs-sm);
  color: var(--color-text-secondary);
  transition: color var(--transition);
}

.resume__contact-item:hover {
  color: var(--color-accent);
}

.resume__body {
  padding: var(--space-2xl) 0 var(--space-4xl);
}

.resume__section {
  margin-bottom: var(--space-2xl);
}

.resume__section-title {
  font-size: 0.75rem;
  font-weight: var(--fw-semibold);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: var(--space-lg);
  padding-bottom: var(--space-sm);
  border-bottom: 1px solid var(--color-border);
}

.resume__summary {
  font-size: var(--fs-md);
  color: var(--color-text-secondary);
  line-height: var(--lh-normal);
  max-width: 680px;
}

.exp-group {
  padding: var(--space-xl) 0;
  border-bottom: 1px solid var(--color-border);
}

.exp-group:first-child { padding-top: 0; }
.exp-group:last-child { border-bottom: none; }

.exp-group__header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: var(--space-md);
  margin-bottom: var(--space-md);
}

.exp-group__name {
  font-size: var(--fs-base);
  font-weight: var(--fw-semibold);
}

.exp-group__industry {
  font-size: 0.75rem;
  color: var(--color-text-muted);
  display: block;
  margin-top: 2px;
}

.exp-group__tenure {
  font-size: 0.75rem;
  color: var(--color-text-muted);
  white-space: nowrap;
}

.exp-group__roles {
  display: flex;
  flex-direction: column;
  margin-bottom: var(--space-md);
  padding-left: 2px;
}

.exp-role {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: 4px 0;
  position: relative;
}

.exp-role:not(:last-child)::after {
  content: '';
  position: absolute;
  left: 3.5px;
  top: 20px;
  bottom: -4px;
  width: 1px;
  background: var(--color-border);
}

.exp-role__dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  border: 1.5px solid var(--color-text-muted);
  background: var(--color-bg);
  flex-shrink: 0;
  position: relative;
  z-index: 1;
}

.exp-role--current .exp-role__dot {
  border-color: var(--color-accent);
  background: var(--color-accent);
}

.exp-role__info {
  display: flex;
  justify-content: space-between;
  flex: 1;
  gap: var(--space-sm);
}

.exp-role__title {
  font-size: var(--fs-sm);
  font-weight: var(--fw-medium);
}

.exp-role--current .exp-role__title {
  font-weight: var(--fw-semibold);
}

.exp-role__date {
  font-size: 0.75rem;
  color: var(--color-text-muted);
  white-space: nowrap;
}

.exp-group__highlights {
  padding-left: var(--space-xl);
}

.exp-group__highlights li {
  font-size: var(--fs-sm);
  color: var(--color-text-secondary);
  line-height: var(--lh-normal);
  padding: 2px 0 2px var(--space-md);
  position: relative;
}

.exp-group__highlights li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.85em;
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--color-text-muted);
}

.resume__tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.resume__tag {
  font-size: 0.75rem;
  font-weight: var(--fw-medium);
  color: var(--color-text-secondary);
  padding: var(--space-xs) var(--space-md);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
}

.resume__edu-degree {
  font-size: var(--fs-base);
  font-weight: var(--fw-semibold);
  margin-bottom: var(--space-xs);
}

.resume__edu-school {
  font-size: var(--fs-sm);
  color: var(--color-text-secondary);
}


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

@media (max-width: 767px) {
  .nav__links { display: none; }
  .nav__right-mobile { display: flex; }
  .nav__toggle { display: flex; }

  .container { padding: 0 var(--space-lg); }

  .intro { padding-top: 120px; }

  .journey__item {
    grid-template-columns: 1fr;
    gap: var(--space-xs);
  }

  .exp-group__header {
    flex-direction: column;
    gap: var(--space-xs);
  }

  .exp-role__info {
    flex-direction: column;
    gap: 0;
  }

  .resume__header-meta {
    flex-direction: column;
    gap: var(--space-sm);
  }
}


/* ========================================
   REDUCED MOTION
   ======================================== */

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  *, *::before, *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
}