/* =========================================================
   melichavez.com — v1 stylesheet
   Mobile-first: base styles target small screens; the
   @media (min-width: …) blocks at the bottom add layout
   for wider screens.
   ========================================================= */

/* ---------- 1. Design tokens ----------
   Change a colour or size here and it updates everywhere. */
:root {
  /* Colours: palette B "Slate and cobalt" */
  --color-paper: #f3f5f8;      /* page background */
  --color-surface: #ffffff;    /* cards */
  --color-ink: #0f1a2b;        /* headings, main text */
  --color-text: #273244;       /* body text */
  --color-muted: #4f5b6d;      /* secondary text (6.3:1 contrast) */
  --color-line: rgba(15, 26, 43, 0.14);
  --color-header-bg: rgba(243, 245, 248, 0.94);
  --color-tag-border: rgba(15, 26, 43, 0.3);
  --color-track: #d9dfea;      /* theme toggle background */

  /* Photo filter (none for now; kept as a hook for later tweaks) */
  --photo-filter: none;

  /* One accent. --color-accent is for borders and decoration (5.7:1);
     --color-accent-text is for text and passes WCAG AA (7.2:1). */
  --color-accent: #3355d1;
  --color-accent-text: #2846b8;

  /* Supporting colours: decoration only (project card borders), never text */
  --color-accent-2: #12a594;   /* teal */
  --color-accent-3: #f0b429;   /* amber */

  /* Type */
  --font-display: "Fraunces", Georgia, serif;
  --font-body: "Inter", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, Consolas, monospace;

  /* Spacing scale */
  --space-1: 0.5rem;
  --space-2: 1rem;
  --space-3: 1.5rem;
  --space-4: 2rem;
  --space-5: 3rem;
  --space-6: 4.5rem;

  --max-width: 64rem;
  --gutter: 1.25rem;
  --radius: 6px;
}

/* ---------- 1b. Dark theme ----------
   Same token names, new values. Applied when <html data-theme="dark">
   (set by js/theme.js). Every text colour checked: 7:1 or better. */
[data-theme="dark"] {
  color-scheme: dark;          /* dark scrollbars and form controls */
  --color-paper: #14181f;      /* deep slate: a hint of blue, calmer than navy */
  --color-surface: #1d222b;
  --color-ink: #eef2f8;
  --color-text: #cdd5e1;
  --color-muted: #a3aec0;
  --color-line: rgba(238, 242, 248, 0.14);
  --color-header-bg: rgba(20, 24, 31, 0.94);
  --color-tag-border: rgba(238, 242, 248, 0.3);
  --color-track: #2a303b;

  --color-accent: #6f8cff;
  --color-accent-text: #93a9ff;
  --color-accent-2: #2cc4b0;
  --color-accent-3: #f5c451;
}

/* ---------- 2. Base ---------- */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  font-size: 106.25%; /* 17px when the browser default is 16px. A % (not px) respects
                         visitors who set a larger default font in their browser. */
  scroll-behavior: smooth;
  scroll-padding-top: 5rem; /* stops the sticky header covering section titles */
}

body {
  margin: 0;
  background: var(--color-paper);
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.6;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

h1, h2, h3 {
  color: var(--color-ink);
  margin: 0;
}

p {
  margin: 0;
}

a {
  color: inherit;
}

/* Visible keyboard focus everywhere */
:focus-visible {
  outline: 3px solid var(--color-accent-text);
  outline-offset: 3px;
}

.wrap {
  width: 100%;
  max-width: var(--max-width);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

/* Hidden until a keyboard user presses Tab */
.skip-link {
  position: absolute;
  left: var(--space-2);
  top: -4rem;
  z-index: 100;
  padding: var(--space-1) var(--space-2);
  background: var(--color-ink);
  color: var(--color-paper);
  border-radius: var(--radius);
}
.skip-link:focus {
  top: var(--space-2);
}

/* ---------- 3. Header ---------- */
.site-header {
  /* Scrolls away on phones (saves screen space); pinned from tablet up, see section 12 */
  z-index: 10;
  background: var(--color-header-bg);
  border-bottom: 1px solid var(--color-line);
  backdrop-filter: blur(6px);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap; /* on very narrow phones the nav drops below the name */
  gap: 0.25rem var(--space-2);
  padding-block: 0.875rem;
}

.logo {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.125rem;
  color: var(--color-ink);
  text-decoration: none;
  white-space: nowrap;
}

.nav-list {
  display: flex;
  gap: 0.875rem;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 0.875rem;
}

.nav-list a {
  display: inline-block;
  padding-block: 0.375rem; /* bigger tap target */
  text-decoration: none;
  border-bottom: 2px solid transparent;
}

.nav-list a:hover {
  border-bottom-color: var(--color-accent);
}

.site-header nav {
  margin-left: auto; /* keeps nav and toggle together on the right */
}

/* Sun and moon switch */
.theme-toggle {
  display: inline-flex;
  gap: 2px;
  padding: 3px;
  border: 0;
  border-radius: 999px;
  background: var(--color-track);
  cursor: pointer;
}

.theme-toggle[hidden] {
  display: none;
}

.theme-toggle__icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 1.625rem;
  border-radius: 999px;
  color: var(--color-muted);
  transition: background-color 0.2s, color 0.2s;
}

.theme-toggle__icon svg {
  width: 1rem;
  height: 1rem;
}

/* Light mode: the sun is "on" */
.theme-toggle__icon--sun {
  background: var(--color-surface);
  color: var(--color-accent-text);
}

/* Dark mode: the moon is "on" */
[data-theme="dark"] .theme-toggle__icon--sun {
  background: transparent;
  color: var(--color-muted);
}

[data-theme="dark"] .theme-toggle__icon--moon {
  background: var(--color-accent);
  color: var(--color-paper);
}

/* ---------- 4. Hero ---------- */
.hero {
  display: flex;
  flex-direction: column-reverse; /* photo above text on phones */
  gap: var(--space-4);
  padding-block: var(--space-5) var(--space-4);
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: var(--color-accent-text);
  margin-bottom: var(--space-2);
}

.hero h1 {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(2rem, 6vw, 3.5rem);
  line-height: 1.12;
  max-width: 16ch;
  margin-bottom: var(--space-3);
}

.hero__body {
  font-size: 1.125rem;
  max-width: 52ch;
  margin-bottom: var(--space-4);
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.hero__portrait img {
  width: 6.5rem;
  aspect-ratio: 1;
  object-fit: cover;
  border-radius: 50%;                      /* circle */
  box-shadow: 0 0 0 1px var(--color-line); /* neutral hairline; a shadow doesn't add to the size like a border does */
  filter: var(--photo-filter);
}

/* ---------- 5. Buttons & links ---------- */
.button {
  display: inline-block;
  padding: 0.75rem 1.25rem;
  border-radius: var(--radius);
  border: 2px solid var(--color-ink);
  font-weight: 500;
  font-size: 0.9375rem;
  text-decoration: none;
  transition: background-color 0.15s, color 0.15s;
}

.button--primary {
  background: var(--color-ink);
  color: var(--color-paper);
}
.button--primary:hover {
  background: var(--color-accent-text);
  border-color: var(--color-accent-text);
}

.button--ghost {
  color: var(--color-ink);
}
.button--ghost:hover {
  background: var(--color-ink);
  color: var(--color-paper);
}

.text-link {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: var(--color-ink);
  text-decoration-color: var(--color-accent);
  text-underline-offset: 4px;
}

/* ---------- 6. Stats ---------- */
.stat-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-3) var(--space-2);
  margin: 0;
  padding: var(--space-3) 0 var(--space-4);
  list-style: none;
}

.stat {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.stat__value {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 2rem;
  line-height: 1;
  color: var(--color-accent-text);
}

.stat__label {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: var(--color-muted);
  max-width: 22ch;
}

/* ---------- 7. Sections ---------- */
.section {
  padding-block: var(--space-5);
  border-top: 1px solid var(--color-line);
}

.section h2 {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 1.75rem;
  margin-bottom: var(--space-2);
}

.section__intro {
  max-width: 60ch;
  color: var(--color-muted);
  margin-bottom: var(--space-4);
}

/* ---------- 8. Project cards ---------- */
.project-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-3);
}

.project-card {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  padding: var(--space-3);
  background: var(--color-surface);
  border: 1px solid var(--color-line);
  border-top: 4px solid var(--color-ink);
  border-radius: var(--radius);
}

.project-card--accent-1 { border-top-color: var(--color-accent); }
.project-card--accent-2 { border-top-color: var(--color-accent-2); }
.project-card--accent-3 { border-top-color: var(--color-accent-3); }

.project-card h3 {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 1.375rem;
}

.project-card__kind {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--color-accent-text);
  margin-top: -0.5rem;
}

.project-card__points {
  margin: 0;
  padding-left: 1.1rem;
  font-size: 0.9375rem;
  color: var(--color-muted);
}

.project-card__points li + li {
  margin-top: 0.25rem;
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: auto 0 0; /* pushes tags to the bottom of the card */
  padding: 0.75rem 0 0;
  list-style: none;
  border-top: 1px solid var(--color-line);
}

.tag-list li {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  padding: 0.25rem 0.625rem;
  border: 1px solid var(--color-tag-border);
  border-radius: 999px;
}

.more-link {
  margin-top: var(--space-4);
}

/* ---------- 9. Experience timeline ---------- */
.timeline {
  margin: 0;
  padding: 0;
  list-style: none;
}

.role {
  padding-block: var(--space-3);
  border-top: 1px solid var(--color-line);
}

.role:last-child {
  border-bottom: 1px solid var(--color-line);
}

.role__head {
  display: flex;
  flex-direction: column;
  gap: 0.125rem;
}

.role h3,
.plain-list h3 {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 1.1875rem;
}

.role__date {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: var(--color-muted);
}

.role__org {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: var(--color-accent-text);
  margin-block: 0.25rem 0.5rem;
}

.role p:last-child {
  max-width: 68ch;
}

/* ---------- 10. Education & skills ---------- */
.two-col {
  display: grid;
  gap: var(--space-5);
}

.plain-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.plain-list li + li {
  margin-top: var(--space-3);
}

.skills {
  margin: 0;
}

.skills dt {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--color-accent-text);
}

.skills dd {
  margin: 0.25rem 0 var(--space-3);
}

/* ---------- 11. Contact & footer ---------- */
.contact-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.site-footer {
  padding-block: var(--space-4) var(--space-5);
  border-top: 1px solid var(--color-line);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--color-muted);
}

/* ---------- 12. Wider screens ---------- */

/* Tablet: 768px and up */
@media (min-width: 48rem) {
  :root {
    --gutter: 2rem;
  }

  .site-header {
    position: sticky;
    top: 0;
  }

  .nav-list {
    gap: var(--space-3);
  }

  .hero {
    flex-direction: row;
    align-items: center;
    justify-content: flex-start; /* photo follows the copy instead of hugging the far edge */
    gap: var(--space-6);
    padding-block: var(--space-6) var(--space-5);
  }

  .hero__portrait img {
    width: 12rem;
  }

  .stat-list {
    grid-template-columns: repeat(4, 1fr);
  }

  .project-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .role__head {
    flex-direction: row;
    justify-content: space-between;
    align-items: baseline;
    gap: var(--space-2);
  }

  .role__date {
    flex-shrink: 0;
  }
}

/* Desktop: 1024px and up */
@media (min-width: 64rem) {
  .project-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .two-col {
    grid-template-columns: 1fr 1fr;
  }

  .section h2 {
    font-size: 2rem;
  }
}

/* Respect users who ask their OS for less motion */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  .button,
  .theme-toggle__icon {
    transition: none;
  }
}