/* ===================================
   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, 1.0625rem);
  --text-lg: clamp(1.125rem, 1rem + 0.75vw, 1.375rem);
  --text-xl: clamp(1.5rem, 1.2rem + 1.25vw, 2rem);
  --text-2xl: clamp(2rem, 1.2rem + 2.5vw, 3rem);
  --text-hero: clamp(2.5rem, 0.5rem + 5.5vw, 5rem);

  /* 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;

  /* Fonts */
  --font-display: 'Cabinet Grotesk', 'Inter', sans-serif;
  --font-body: 'Satoshi', 'Inter', sans-serif;

  /* Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;

  /* Content */
  --content-wide: 1120px;
  --content-narrow: 680px;
}

/* Dark Theme (default) */
[data-theme="dark"] {
  --color-bg: #0a0a0b;
  --color-surface: #111113;
  --color-surface-2: #18181b;
  --color-border: #27272a;
  --color-border-subtle: #1e1e21;
  --color-text: #ececef;
  --color-text-muted: #8b8b94;
  --color-text-faint: #52525b;
  --color-accent: #6ee7b7;
  --color-accent-dim: rgba(110, 231, 183, 0.12);
  --color-accent-hover: #a7f3d0;
}

/* Light Theme */
[data-theme="light"] {
  --color-bg: #fafaf9;
  --color-surface: #ffffff;
  --color-surface-2: #f4f4f5;
  --color-border: #e4e4e7;
  --color-border-subtle: #f0f0f2;
  --color-text: #18181b;
  --color-text-muted: #71717a;
  --color-text-faint: #a1a1aa;
  --color-accent: #059669;
  --color-accent-dim: rgba(5, 150, 105, 0.08);
  --color-accent-hover: #047857;
}

/* ===================================
   NAV
   =================================== */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: oklch(from var(--color-bg) l c h / 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--color-border-subtle);
}

.nav__inner {
  max-width: var(--content-wide);
  margin: 0 auto;
  padding: var(--space-4) var(--space-6);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav__logo {
  color: var(--color-accent);
  display: flex;
  align-items: center;
}

.nav__links {
  display: flex;
  align-items: center;
  gap: var(--space-8);
}

.nav__links a {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-muted);
  text-decoration: none;
  letter-spacing: 0.01em;
}

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

.nav__cta {
  background: var(--color-accent-dim);
  color: var(--color-accent) !important;
  padding: var(--space-2) var(--space-5);
  border-radius: var(--radius-sm);
  font-weight: 600 !important;
}

.nav__cta:hover {
  background: var(--color-accent);
  color: var(--color-bg) !important;
}

.nav__mobile {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: var(--space-2);
}

.nav__mobile span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: transform 200ms ease, opacity 200ms ease;
}

/* Mobile Menu */
.mobile-menu {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 99;
  background: var(--color-bg);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 300ms ease;
}

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

.mobile-menu ul {
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: var(--space-8);
}

.mobile-menu a {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-text);
  text-decoration: none;
}

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

@media (max-width: 768px) {
  .nav__links { display: none; }
  .nav__mobile { display: flex; }
}

/* ===================================
   HERO
   =================================== */
.hero {
  min-height: 100dvh;
  display: flex;
  align-items: center;
  padding: var(--space-32) var(--space-6) var(--space-16);
}

.hero__inner {
  max-width: var(--content-wide);
  margin: 0 auto;
  width: 100%;
}

/* Hero Row Layout */
.hero__row {
  display: flex;
  align-items: center;
  gap: var(--space-16);
  margin-bottom: var(--space-10);
}

.hero__text {
  flex: 1;
  min-width: 0;
}

.hero__photo {
  flex-shrink: 0;
  width: 260px;
  height: 340px;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 2px solid var(--color-border);
  background: var(--color-surface-2);
}

.hero__photo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 5%;
  filter: grayscale(20%) contrast(1.05);
}

@media (max-width: 768px) {
  .hero__row {
    flex-direction: column;
    gap: var(--space-8);
  }
  .hero__photo {
    width: 180px;
    height: 180px;
    order: -1;
  }
}

.hero__tag {
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--color-accent);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: var(--space-6);
}

.hero__title {
  font-family: var(--font-display);
  font-size: var(--text-hero);
  font-weight: 800;
  color: var(--color-text);
  line-height: 1.05;
  margin-bottom: var(--space-6);
  letter-spacing: -0.03em;
}

.hero__sub {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  max-width: 560px;
  line-height: 1.7;
  margin-bottom: var(--space-10);
}

.hero__sub a {
  color: var(--color-accent);
  text-decoration: none;
  font-weight: 600;
}

.hero__sub a:hover {
  text-decoration: underline;
}

.hero__actions {
  display: flex;
  gap: var(--space-4);
  flex-wrap: wrap;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 600;
  text-decoration: none;
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-sm);
  cursor: pointer;
  border: none;
}

.btn--primary {
  background: var(--color-accent);
  color: #0a0a0b;
}

.btn--primary:hover {
  background: var(--color-accent-hover);
  transform: translateY(-1px);
}

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

.btn--ghost:hover {
  border-color: var(--color-text-muted);
  color: var(--color-text);
}

.btn--sm {
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-xs);
}

.btn--lg {
  padding: var(--space-4) var(--space-8);
  font-size: var(--text-sm);
}

/* Hero Stats */
.hero__stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-8);
  border-top: 1px solid var(--color-border-subtle);
  padding-top: var(--space-8);
}

.stat__num {
  display: block;
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-1);
}

.stat__label {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  line-height: 1.5;
}

@media (max-width: 640px) {
  .hero__stats {
    grid-template-columns: 1fr;
    gap: var(--space-6);
  }
  .hero {
    min-height: auto;
    padding-top: calc(var(--space-32) + var(--space-12));
    padding-bottom: var(--space-12);
  }
  .hero__title {
    font-size: clamp(2rem, 0.5rem + 8vw, 3rem);
  }
}

/* ===================================
   SECTIONS
   =================================== */
.section {
  padding: clamp(var(--space-16), 8vw, var(--space-24)) var(--space-6);
}

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

.section__inner {
  max-width: var(--content-wide);
  margin: 0 auto;
}

.section__inner--narrow {
  max-width: var(--content-narrow);
  margin: 0 auto;
}

.section__label {
  display: block;
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--color-accent);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: var(--space-6);
}

.section__title {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 800;
  color: var(--color-text);
  margin-bottom: var(--space-12);
  letter-spacing: -0.02em;
}

/* ===================================
   ABOUT
   =================================== */
.about__grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: var(--space-16);
  align-items: start;
}

.about__text h2 {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 800;
  color: var(--color-text);
  margin-bottom: var(--space-6);
  letter-spacing: -0.02em;
}

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

.about__highlights {
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
}

.highlight {
  display: flex;
  align-items: flex-start;
  gap: var(--space-4);
  padding: var(--space-5);
  background: var(--color-surface);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-md);
}

.highlight__icon {
  flex-shrink: 0;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-accent-dim);
  border-radius: var(--radius-sm);
  color: var(--color-accent);
}

.highlight strong {
  display: block;
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 2px;
}

.highlight span {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}

@media (max-width: 768px) {
  .about__grid {
    grid-template-columns: 1fr;
    gap: var(--space-10);
  }
}

/* ===================================
   EXPERIENCE / TIMELINE
   =================================== */
.timeline {
  position: relative;
  padding-left: var(--space-8);
}

.timeline::before {
  content: '';
  position: absolute;
  left: 7px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: var(--color-border);
}

.timeline__item {
  position: relative;
  padding-bottom: var(--space-10);
}

.timeline__item:last-child {
  padding-bottom: 0;
}

.timeline__marker {
  position: absolute;
  left: calc(-1 * var(--space-8) + 3px);
  top: 8px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--color-accent);
  border: 2px solid var(--color-bg);
}

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

.timeline__content {
  padding: var(--space-5) var(--space-6);
  background: var(--color-surface-2);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-md);
}

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

.timeline__header {
  display: flex;
  align-items: baseline;
  gap: var(--space-3);
  flex-wrap: wrap;
  margin-bottom: var(--space-1);
}

.timeline__header h3 {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--color-text);
}

.timeline__co {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

.timeline__co a {
  color: var(--color-accent);
  text-decoration: none;
}

.timeline__co a:hover {
  text-decoration: underline;
}

.timeline__date {
  display: block;
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  margin-bottom: var(--space-3);
}

.timeline__content > p {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.7;
  margin-bottom: var(--space-4);
}

.timeline__tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.timeline__tags span {
  font-size: var(--text-xs);
  font-weight: 500;
  padding: 2px var(--space-3);
  border-radius: var(--radius-sm);
  background: var(--color-accent-dim);
  color: var(--color-accent);
}

/* ===================================
   PROJECTS
   =================================== */
.projects__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-6);
}

.project {
  padding: var(--space-8);
  background: var(--color-surface);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-lg);
  position: relative;
  transition: border-color 200ms ease, transform 200ms ease;
}

.project:hover {
  border-color: var(--color-border);
  transform: translateY(-2px);
}

.project--featured {
  grid-column: 1 / -1;
  background: var(--color-surface-2);
  border-color: var(--color-accent-dim);
}

.project--featured:hover {
  border-color: var(--color-accent);
}

.project__badge {
  position: absolute;
  top: var(--space-4);
  right: var(--space-4);
  font-size: var(--text-xs);
  font-weight: 600;
  padding: 2px var(--space-3);
  background: var(--color-accent-dim);
  color: var(--color-accent);
  border-radius: var(--radius-sm);
}

.project__content h3 {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-3);
}

.project__desc {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.7;
  margin-bottom: var(--space-5);
}

.project__meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-bottom: var(--space-5);
}

.project__meta span {
  font-size: var(--text-xs);
  font-weight: 500;
  padding: 2px var(--space-3);
  border-radius: var(--radius-sm);
  background: var(--color-accent-dim);
  color: var(--color-accent);
}

.project__links {
  display: flex;
  gap: var(--space-3);
}

@media (max-width: 640px) {
  .projects__grid {
    grid-template-columns: 1fr;
  }
  .project--featured {
    grid-column: 1;
  }
}

/* ===================================
   SKILLS
   =================================== */
.skills__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-6);
}

.skill-group {
  padding: var(--space-6);
  background: var(--color-bg);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-md);
}

.skill-group h3 {
  font-family: var(--font-display);
  font-size: var(--text-sm);
  font-weight: 700;
  color: var(--color-accent);
  margin-bottom: var(--space-4);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.skill-group ul {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.skill-group li {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  padding: var(--space-1) 0;
  border-bottom: 1px solid var(--color-border-subtle);
}

.skill-group li:last-child {
  border-bottom: none;
}

@media (max-width: 900px) {
  .skills__grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 480px) {
  .skills__grid {
    grid-template-columns: 1fr;
  }
}

/* ===================================
   CONTACT
   =================================== */
.contact__title {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 800;
  color: var(--color-text);
  margin-bottom: var(--space-4);
  letter-spacing: -0.02em;
}

.contact__sub {
  color: var(--color-text-muted);
  line-height: 1.7;
  margin-bottom: var(--space-10);
}

.contact__links {
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
  align-items: flex-start;
}

.contact__links .btn--lg {
  word-break: break-all;
}

.contact__socials {
  display: flex;
  gap: var(--space-5);
}

.contact__socials a {
  color: var(--color-text-faint);
  transition: color 200ms ease, transform 200ms ease;
}

.contact__socials a:hover {
  color: var(--color-accent);
  transform: translateY(-2px);
}

/* ===================================
   FOOTER
   =================================== */
.footer {
  padding: var(--space-8) var(--space-6);
  border-top: 1px solid var(--color-border-subtle);
}

.footer__inner {
  max-width: var(--content-wide);
  margin: 0 auto;
  text-align: center;
  font-size: var(--text-xs);
  color: var(--color-text-faint);
}

/* ===================================
   SCROLL ANIMATIONS
   =================================== */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 600ms cubic-bezier(0.16, 1, 0.3, 1),
              transform 600ms cubic-bezier(0.16, 1, 0.3, 1);
}

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

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