/* ============================================
   Andrea Chahin — Portfolio
   Art direction: warm, editorial, civic-minded
   Palette: warm ivory/cream with amethyst purple accent
   Typography: Zodiak (display) + Satoshi (body)
   ============================================ */

:root,
[data-theme='light'] {
  /* 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);
  --text-3xl: clamp(2.5rem, 1rem + 4vw, 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;

  /* Surfaces — warm ivory */
  --color-bg: #f8f6f1;
  --color-surface: #f3f0e8;
  --color-surface-2: #ede9df;
  --color-divider: #d8d3c7;
  --color-border: #cec8ba;

  /* Text — warm charcoal */
  --color-text: #2c2a24;
  --color-text-muted: #6b6860;
  --color-text-faint: #a9a69e;

  /* Primary — amethyst purple (intellectual, warm, grounded) */
  --color-primary: #5b3a6b;
  --color-primary-hover: #4a2d5a;
  --color-primary-active: #3d244c;
  --color-primary-light: #ede0f0;

  /* Accent — warm terracotta (human, earthy, warm) */
  --color-accent: #b5724b;
  --color-accent-hover: #9a5f3c;
  --color-accent-light: #f0e1d5;

  /* Radius */
  --radius-sm: 0.25rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;

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

  /* Shadows */
  --shadow-sm: 0 1px 3px oklch(0.3 0.02 80 / 0.06);
  --shadow-md: 0 4px 12px oklch(0.3 0.02 80 / 0.08);
  --shadow-lg: 0 12px 32px oklch(0.3 0.02 80 / 0.12);

  /* Content widths */
  --content-narrow: 640px;
  --content-default: 920px;
  --content-wide: 1100px;

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

/* Dark mode */
[data-theme='dark'] {
  --color-bg: #1a1916;
  --color-surface: #22211d;
  --color-surface-2: #2a2924;
  --color-divider: #3a3832;
  --color-border: #4a4740;
  --color-text: #d9d6cf;
  --color-text-muted: #8f8c85;
  --color-text-faint: #5f5d57;
  --color-primary: #a67db8;
  --color-primary-hover: #b894c8;
  --color-primary-active: #caaed6;
  --color-primary-light: #332a3a;
  --color-accent: #cf9070;
  --color-accent-hover: #daa488;
  --color-accent-light: #3a2e25;
  --shadow-sm: 0 1px 3px oklch(0 0 0 / 0.2);
  --shadow-md: 0 4px 12px oklch(0 0 0 / 0.3);
  --shadow-lg: 0 12px 32px oklch(0 0 0 / 0.35);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    --color-bg: #1a1916;
    --color-surface: #22211d;
    --color-surface-2: #2a2924;
    --color-divider: #3a3832;
    --color-border: #4a4740;
    --color-text: #d9d6cf;
    --color-text-muted: #8f8c85;
    --color-text-faint: #5f5d57;
    --color-primary: #a67db8;
    --color-primary-hover: #b894c8;
    --color-primary-active: #caaed6;
    --color-primary-light: #332a3a;
    --color-accent: #cf9070;
    --color-accent-hover: #daa488;
    --color-accent-light: #3a2e25;
    --shadow-sm: 0 1px 3px oklch(0 0 0 / 0.2);
    --shadow-md: 0 4px 12px oklch(0 0 0 / 0.3);
    --shadow-lg: 0 12px 32px oklch(0 0 0 / 0.35);
  }
}

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

.container {
  max-width: var(--content-default);
  margin-inline: auto;
  padding-inline: var(--space-4);
}

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

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

/* ============================================
   Header / Navigation
   ============================================ */

.header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: oklch(from var(--color-bg) l c h / 0.92);
  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;
  gap: var(--space-4);
}

.header__name {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 500;
  color: var(--color-text);
  text-decoration: none;
  letter-spacing: -0.01em;
}

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

.header__link {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  text-decoration: none;
  letter-spacing: 0.02em;
  text-transform: lowercase;
}

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

.header__link--active {
  color: var(--color-text);
}

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

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

/* Mobile nav */
.mobile-menu-btn {
  display: none;
  width: 44px;
  height: 44px;
  align-items: center;
  justify-content: center;
  color: var(--color-text-muted);
}

@media (max-width: 640px) {
  .header__nav {
    display: none;
  }
  .header__nav--open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-divider);
    padding: var(--space-4);
    gap: var(--space-4);
  }
  .mobile-menu-btn {
    display: flex;
  }
}

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

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

.hero__label {
  font-size: var(--text-sm);
  color: var(--color-primary);
  letter-spacing: 0.06em;
  text-transform: lowercase;
  margin-bottom: var(--space-4);
  font-weight: 500;
}

.hero__title {
  font-family: var(--font-display);
  font-size: var(--text-3xl);
  font-weight: 400;
  color: var(--color-text);
  line-height: 1.05;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-6);
  max-width: 16ch;
}

.hero__subtitle {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  max-width: 52ch;
  line-height: 1.65;
  margin-bottom: var(--space-8);
}

.hero__cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  align-items: center;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  font-weight: 500;
  padding: var(--space-2) var(--space-5);
  border-radius: var(--radius-md);
  text-decoration: none;
  letter-spacing: 0.01em;
}

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

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

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

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

/* ============================================
   Section basics
   ============================================ */

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

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

.section__label {
  font-size: var(--text-xs);
  color: var(--color-primary);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-weight: 600;
  margin-bottom: var(--space-2);
}

.section__title {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 400;
  color: var(--color-text);
  margin-bottom: var(--space-3);
  letter-spacing: -0.01em;
}

.section__desc {
  color: var(--color-text-muted);
  max-width: 56ch;
  margin-bottom: var(--space-8);
  line-height: 1.65;
}

/* ============================================
   About / Bio
   ============================================ */

.about__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-8);
  margin-top: var(--space-8);
}

@media (min-width: 768px) {
  .about__grid {
    grid-template-columns: 280px 1fr;
    gap: var(--space-10);
    align-items: start;
  }
}

.about__photo {
  display: flex;
  justify-content: center;
}

.about__portrait {
  width: 100%;
  max-width: 280px;
  height: auto;
  border-radius: var(--radius-lg);
  object-fit: cover;
  aspect-ratio: 3 / 4;
  box-shadow: var(--shadow-md);
}

.about__right {
  display: flex;
  flex-direction: column;
  gap: var(--space-8);
}

.about__personal {
  font-style: italic;
  color: var(--color-text-muted) !important;
  margin-top: var(--space-4);
  border-top: 1px solid var(--color-divider);
  padding-top: var(--space-4);
}

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

.about__text p:first-child {
  color: var(--color-text);
  font-size: var(--text-base);
}

.about__details {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.detail-item {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  padding-bottom: var(--space-4);
  border-bottom: 1px solid var(--color-divider);
}

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

.detail-item__label {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  font-weight: 500;
}

.detail-item__value {
  font-size: var(--text-sm);
  color: var(--color-text);
}

.detail-item__value a {
  color: var(--color-primary);
  text-decoration: none;
}

.detail-item__value a:hover {
  text-decoration: underline;
}

/* ============================================
   Projects / Work
   ============================================ */

.projects__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
}

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

.project-card {
  padding: var(--space-6);
  background: var(--color-bg);
  border: 1px solid var(--color-divider);
  border-radius: var(--radius-lg);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  transition: box-shadow var(--transition-interactive), border-color var(--transition-interactive);
}

.section--alt .project-card {
  background: var(--color-surface-2);
}

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

.project-card__tag {
  font-size: var(--text-xs);
  color: var(--color-primary);
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.project-card__title {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 400;
  color: var(--color-text);
  line-height: 1.25;
}

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

.project-card__skills {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-top: var(--space-2);
}

.skill-tag {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  background: var(--color-surface);
  padding: var(--space-1) var(--space-3);
  border-radius: 100px;
  letter-spacing: 0.02em;
}

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

/* ============================================
   Writing / Substack
   ============================================ */

.writing__intro {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-8);
  margin-bottom: var(--space-8);
}

@media (min-width: 768px) {
  .writing__intro {
    grid-template-columns: 2fr 1fr;
    align-items: start;
  }
}

.writing__text {
  color: var(--color-text-muted);
  line-height: 1.7;
}

.writing__cta {
  padding: var(--space-5);
  background: var(--color-primary-light);
  border-radius: var(--radius-lg);
  text-align: center;
}

.writing__cta p {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  margin-bottom: var(--space-3);
  max-width: none;
}

.topics-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-3);
}

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

.topic-item {
  display: flex;
  align-items: baseline;
  gap: var(--space-3);
  padding: var(--space-3) 0;
  border-bottom: 1px solid var(--color-divider);
  font-size: var(--text-sm);
  color: var(--color-text);
  line-height: 1.5;
}

.topic-item::before {
  content: '';
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-primary);
  flex-shrink: 0;
  margin-top: 0.5em;
}

/* ============================================
   Contact
   ============================================ */

.contact__content {
  max-width: 56ch;
}

.contact__content p {
  color: var(--color-text-muted);
  line-height: 1.7;
  margin-bottom: var(--space-6);
}

.contact__links {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

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

.contact__link:hover {
  color: var(--color-primary-hover);
  text-decoration: underline;
}

/* Contact form */
.contact-form {
  margin-top: var(--space-6);
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
}

.contact-form__row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-5);
}

@media (max-width: 600px) {
  .contact-form__row {
    grid-template-columns: 1fr;
  }
}

.contact-form__field {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.contact-form__label {
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--color-text-muted);
  letter-spacing: 0.03em;
}

.contact-form__input {
  font-family: var(--font-body);
  font-size: var(--text-sm);
  color: var(--color-text);
  background: var(--color-bg);
  border: 1px solid var(--color-divider);
  border-radius: 6px;
  padding: var(--space-3) var(--space-4);
  transition: border-color var(--transition-interactive), box-shadow var(--transition-interactive);
}

.contact-form__input::placeholder {
  color: var(--color-text-faint);
}

.contact-form__input:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-light);
}

.contact-form__textarea {
  resize: vertical;
  min-height: 120px;
}

.contact-form__submit {
  align-self: flex-start;
}

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

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

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

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

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

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

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

/* ============================================
   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--visible {
  opacity: 1;
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }
}

/* ============================================
   Divider accent
   ============================================ */

.divider-accent {
  width: 40px;
  height: 2px;
  background: var(--color-primary);
  margin-bottom: var(--space-6);
  border-radius: 1px;
}

/* ============================================
   Pullquote
   ============================================ */
   
.pullquote {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 400;
  color: var(--color-text);
  line-height: 1.35;
  border-left: 3px solid var(--color-primary);
  padding-left: var(--space-6);
  margin: var(--space-8) 0;
  max-width: 36ch;
  font-style: italic;
}

.pullquote__attr {
  display: block;
  font-family: var(--font-body);
  font-size: var(--text-xs);
  font-style: normal;
  color: var(--color-text-faint);
  margin-top: var(--space-2);
  letter-spacing: 0.02em;
}