/* ==========================================================================
   Aaron Pacheco — Portfolio
   Blue palette, editorial thin display type with negative tracking, pill
   buttons, and a slow ambient gradient drift behind the hero (respects
   prefers-reduced-motion). Tag/chip density stays as rounded rectangles
   rather than full pills so the many skill/cert tags don't tip into clutter.
   ========================================================================== */

:root {
  /* Surfaces */
  --canvas: #ffffff;
  --surface-1: #dfeafc;
  --surface-2: #c7dcf8;
  --surface-deep: #c3d9f6;
  --hairline: #dce6f3;
  --hairline-strong: #b7cbe6;

  /* Ink: deep blue-navy, never pure black */
  --ink: #0e2a47;
  --ink-muted: #34526f;
  --ink-subtle: #5b7a99;
  --ink-faint: #8aa4bc;

  /* Accent: a true, single blue, used deliberately and consistently */
  --accent: #2563eb;
  --accent-strong: #1d4ed8;
  --accent-soft: #3b82f6;
  --accent-tint: #eef4fe;
  --accent-ring: rgba(37, 99, 235, 0.35);
  --on-accent: #ffffff;

  /* Type */
  --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, "SFMono-Regular", "SF Mono", Menlo, Consolas,
    "Liberation Mono", monospace;

  /* Spacing (4px base) */
  --sp-1: 0.25rem;
  --sp-2: 0.5rem;
  --sp-3: 0.75rem;
  --sp-4: 1rem;
  --sp-5: 1.5rem;
  --sp-6: 2rem;
  --sp-8: 3rem;
  --sp-10: 4rem;
  --sp-section: clamp(3.5rem, 3rem + 3vw, 6rem);

  /* Shape */
  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-pill: 9999px;

  /* Layout */
  --max-width: 1120px;
  --nav-height: 64px;

  /* Motion */
  --ease: cubic-bezier(0.2, 0.7, 0.3, 1);
  --ease-pop: cubic-bezier(0.22, 1.61, 0.36, 1);
  --transition-fast: 140ms var(--ease);

  color-scheme: light;
}

/* This site is intentionally light-only (no auto dark mode) so the
   palette reads consistently regardless of the visitor's OS theme. */

/* ---------------------------------- Reset --------------------------------- */

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

* {
  margin: 0;
}

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

html {
  overflow-x: hidden;
}

body {
  min-height: 100vh;
  overflow-x: hidden;
  background: var(--canvas);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 16px;
  font-weight: 400;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1,
h2,
h3 {
  text-wrap: balance;
}

.tabular-nums {
  font-variant-numeric: tabular-nums;
}

/* Sticky nav is 64px tall; offset anchor targets so a jump-link doesn't
   land a heading underneath it. */
section[id],
#top {
  scroll-margin-top: calc(var(--nav-height) + 1rem);
}

img,
svg {
  display: block;
  max-width: 100%;
}

a {
  color: inherit;
  text-decoration: none;
}

ul {
  list-style: none;
  padding: 0;
}

button {
  font: inherit;
  color: inherit;
  background: none;
  border: 0;
  cursor: pointer;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}

/* Focus visibility */
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 3px;
}

/* ------------------------------- Utilities -------------------------------- */

.container {
  width: 100%;
  max-width: var(--max-width);
  margin-inline: auto;
  padding-inline: clamp(1.25rem, 4vw, 2rem);
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: absolute;
  top: var(--sp-4);
  left: var(--sp-4);
  z-index: 100;
  padding: var(--sp-2) var(--sp-4);
  background: var(--accent);
  color: var(--on-accent);
  border-radius: var(--radius-sm);
  transform: translateY(-150%);
  transition: transform var(--transition-fast);
}

.skip-link:focus {
  transform: translateY(0);
}

.section {
  padding-block: var(--sp-section);
  border-top: 1px solid var(--hairline);
}

.section:first-of-type {
  border-top: 0;
}

.section-soft {
  background: var(--surface-1);
}

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

.section-head {
  max-width: 640px;
  margin-bottom: var(--sp-8);
}

.section-head h2 {
  font-size: clamp(2rem, 1.5rem + 2vw, 2.75rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.1;
}

.section-lede {
  margin-top: var(--sp-3);
  color: var(--ink-subtle);
  font-size: 1.0625rem;
  line-height: 1.6;
}

/* --------------------------------- Buttons -------------------------------- */

.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
  padding: 0.8125rem 1.625rem;
  border-radius: var(--radius-pill);
  font-size: 0.9375rem;
  font-weight: 500;
  line-height: 1.2;
  border: 1px solid transparent;
  transition: background-color var(--transition-fast),
    border-color var(--transition-fast), color var(--transition-fast),
    transform 260ms var(--ease-pop);
  white-space: nowrap;
  touch-action: manipulation;
  -webkit-tap-highlight-color: transparent;
}

.btn:hover {
  transform: translateY(-2px) scale(1.06);
}

.btn:active {
  transform: translateY(1px) scale(0.96);
}

.btn svg {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
}

.btn-primary {
  background: var(--accent);
  color: var(--on-accent);
  border-color: var(--accent);
}

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

.btn-secondary {
  background: transparent;
  color: var(--ink);
  border-color: var(--hairline-strong);
}

.btn-secondary:hover {
  border-color: var(--ink-faint);
  background: var(--surface-1);
}

.btn-ghost {
  background: transparent;
  color: var(--ink-subtle);
  padding: 0.625rem;
  border-radius: 50%;
}

.btn-ghost:hover {
  background: var(--surface-1);
  color: var(--ink);
}

.btn-sm {
  padding: 0.4375rem 0.875rem;
  font-size: 0.875rem;
}

/* ---------------------------------- Header -------------------------------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  height: var(--nav-height);
  display: flex;
  align-items: center;
  background: color-mix(in srgb, var(--canvas) 88%, transparent);
  backdrop-filter: saturate(150%) blur(10px);
  -webkit-backdrop-filter: saturate(150%) blur(10px);
  border-bottom: 1px solid var(--hairline);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  font-weight: 600;
  font-size: 0.9375rem;
  letter-spacing: -0.01em;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--sp-6);
}

.nav-links a {
  position: relative;
  font-size: 0.9375rem;
  color: var(--ink-muted);
  padding-block: var(--sp-1);
  border-bottom: 1px solid transparent;
  transition: color var(--transition-fast);
  touch-action: manipulation;
  -webkit-tap-highlight-color: transparent;
}

.nav-links a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 100%;
  height: 3px;
  background: var(--accent);
  border-radius: 2px;
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 320ms var(--ease-pop);
}

.nav-links a:hover,
.nav-links a.is-active {
  color: var(--ink);
}

.nav-links a:hover::after,
.nav-links a.is-active::after {
  transform: scaleX(1);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
}

.nav-toggle {
  display: none;
  padding: var(--sp-2);
}

.nav-toggle svg {
  width: 22px;
  height: 22px;
}

.icon-close {
  display: none;
}

.nav-toggle[aria-expanded="true"] .icon-open {
  display: none;
}

.nav-toggle[aria-expanded="true"] .icon-close {
  display: block;
}

/* --------------------------------- Hero ----------------------------------- */

.hero {
  position: relative;
  overflow: hidden;
  padding-block: clamp(4rem, 7vw, 7.5rem) clamp(4.5rem, 7vw, 7.5rem);
  background: linear-gradient(135deg, #081b33, #123a6b 60%, #15488a);
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  background-image: radial-gradient(
      46% 65% at 6% -4%,
      rgba(59, 130, 246, 0.55),
      transparent 70%
    ), radial-gradient(40% 56% at 96% 4%, rgba(56, 189, 248, 0.4), transparent 68%),
    radial-gradient(55% 70% at 50% 105%, rgba(8, 27, 51, 0.9), transparent 60%);
  background-size: 230% 230%;
  background-position: 0% 0%;
  animation: mesh-drift 5s ease-in-out infinite alternate;
  pointer-events: none;
}

@keyframes mesh-drift {
  from {
    background-position: 0% 0%;
  }
  to {
    background-position: 58% 46%;
  }
}

.hero-inner {
  position: relative;
  z-index: 1;
  max-width: 760px;
}

@keyframes hero-in {
  from {
    opacity: 0;
    transform: translateY(38px) scale(0.92);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

.hero h1 {
  font-size: clamp(3rem, 2rem + 4vw, 4.75rem);
  font-weight: 700;
  line-height: 1.02;
  letter-spacing: -0.035em;
  color: #ffffff;
  animation: hero-in 850ms var(--ease-pop) both;
}

.hero h2 {
  margin-top: var(--sp-3);
  font-size: clamp(1.1875rem, 1.05rem + 0.6vw, 1.4375rem);
  font-weight: 500;
  color: #cfe1fa;
  letter-spacing: -0.005em;
  animation: hero-in 850ms var(--ease-pop) 150ms both;
}

.hero p {
  margin-top: var(--sp-5);
  font-size: 1.0625rem;
  line-height: 1.65;
  color: #cfe1fa;
  max-width: 60ch;
  animation: hero-in 850ms var(--ease-pop) 300ms both;
}

.hero-actions {
  position: relative;
  z-index: 1;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--sp-3);
  margin-top: var(--sp-8);
  animation: hero-in 850ms var(--ease-pop) 450ms both;
}

.hero .btn-primary {
  background: #ffffff;
  color: var(--accent-strong);
  border-color: #ffffff;
}

.hero .btn-primary:hover {
  background: #cfe1fa;
  border-color: #cfe1fa;
}

.hero .btn-secondary {
  color: #ffffff;
  border-color: rgba(255, 255, 255, 0.4);
}

.hero .btn-secondary:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.6);
}

.hero .btn-ghost {
  color: #a9c3e2;
}

.hero .btn-ghost:hover {
  background: rgba(255, 255, 255, 0.1);
  color: #ffffff;
}

/* ---------------------------------- About --------------------------------- */

.about-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--sp-5);
  max-width: 720px;
}

.about-grid p {
  color: var(--ink-muted);
  font-size: 1.03125rem;
  line-height: 1.7;
}

.about-note {
  margin-top: var(--sp-2);
  padding-top: var(--sp-5);
  border-top: 1px solid var(--hairline);
  color: var(--ink-subtle) !important;
  font-size: 0.9375rem !important;
}

/* ---------------------------------- Skills -------------------------------- */

.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--sp-6) var(--sp-8);
}

.skill-group h3 {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--accent-strong);
  margin-bottom: var(--sp-4);
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-2);
}

.tag {
  display: inline-block;
  padding: 0.375rem 0.75rem;
  font-size: 0.875rem;
  color: var(--accent-strong);
  background: var(--accent-tint);
  border: 1px solid rgba(37, 99, 235, 0.16);
  border-radius: var(--radius-sm);
}

/* -------------------------------- Education ------------------------------- */

.edu-list {
  display: flex;
  flex-direction: column;
  gap: var(--sp-6);
  max-width: 720px;
}

.edu-item {
  display: flex;
  justify-content: space-between;
  gap: var(--sp-5);
  padding-bottom: var(--sp-6);
  border-bottom: 1px solid var(--hairline);
}

.edu-list .edu-item:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.edu-main h3 {
  font-size: 1.0625rem;
  font-weight: 600;
  letter-spacing: -0.005em;
}

.edu-main p {
  margin-top: var(--sp-1);
  color: var(--ink-subtle);
  font-size: 0.9375rem;
}

.edu-meta {
  flex-shrink: 0;
  text-align: right;
  font-size: 0.875rem;
  color: var(--ink-faint);
  white-space: nowrap;
}

.edu-meta span {
  display: block;
}

.edu-gpa {
  margin-top: var(--sp-1);
  color: var(--accent) !important;
  font-weight: 500;
}

.certs-heading {
  margin-top: var(--sp-10);
  margin-bottom: var(--sp-5);
  font-size: 1rem;
  font-weight: 600;
}

.certs-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--sp-6);
}

.cert-group h4 {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--accent-strong);
  margin-bottom: var(--sp-3);
}

.cert-group .tag {
  font-size: 0.8125rem;
}

/* -------------------------------- Projects -------------------------------- */

.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--sp-5);
}

.project-card {
  padding: var(--sp-5);
  background: var(--canvas);
  border: 1px solid var(--hairline);
  border-top: 4px solid var(--accent);
  border-radius: var(--radius-lg);
  transition: border-color var(--transition-fast), transform 280ms var(--ease-pop),
    box-shadow 280ms var(--ease-pop);
}

.project-card:hover {
  border-left-color: var(--hairline-strong);
  border-right-color: var(--hairline-strong);
  border-bottom-color: var(--hairline-strong);
  transform: translateY(-10px) scale(1.015);
  box-shadow: 0 24px 44px rgba(13, 37, 61, 0.18), 0 6px 14px rgba(13, 37, 61, 0.08);
}

.project-card h3 {
  font-size: 1.0625rem;
  font-weight: 600;
  letter-spacing: -0.005em;
}

.project-card p {
  margin-top: var(--sp-3);
  color: var(--ink-subtle);
  font-size: 0.9375rem;
  line-height: 1.6;
}

.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-2);
  margin-top: var(--sp-4);
}

.project-tags .tag {
  font-size: 0.75rem;
  padding: 0.25rem 0.5rem;
}

.additional-projects {
  margin-top: var(--sp-10);
}

.additional-projects h3 {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--accent-strong);
  margin-bottom: var(--sp-5);
}

.additional-list {
  display: flex;
  flex-direction: column;
}

.additional-item {
  display: grid;
  grid-template-columns: minmax(160px, 220px) 1fr;
  gap: var(--sp-5);
  padding-block: var(--sp-4);
  border-top: 1px solid var(--hairline);
}

.additional-item:last-child {
  border-bottom: 1px solid var(--hairline);
}

.additional-item h4 {
  font-size: 0.9375rem;
  font-weight: 600;
}

.additional-item p {
  color: var(--ink-subtle);
  font-size: 0.9375rem;
  line-height: 1.6;
}

/* --------------------------------- Contact -------------------------------- */

.contact-inner {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.contact-inner > p {
  max-width: 56ch;
  color: var(--ink-subtle);
  font-size: 1.0625rem;
  line-height: 1.65;
}

.contact-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-3);
  margin-top: var(--sp-6);
}

.contact-secondary {
  margin-top: var(--sp-6);
  font-size: 0.9375rem;
  color: var(--ink-faint);
}

.contact-secondary a {
  color: var(--ink-subtle);
  border-bottom: 1px solid var(--hairline-strong);
  transition: color var(--transition-fast), border-color var(--transition-fast);
}

.contact-secondary a:hover {
  color: var(--ink);
  border-color: var(--ink-faint);
}

/* ---------------------------------- Footer -------------------------------- */

.site-footer {
  border-top: 1px solid var(--hairline);
  padding-block: var(--sp-6);
}

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

.footer-inner p {
  font-size: 0.875rem;
  color: var(--ink-faint);
}

.footer-links {
  display: flex;
  align-items: center;
  gap: var(--sp-4);
}

.footer-links a {
  font-size: 0.875rem;
  color: var(--ink-subtle);
}

.footer-links a:hover {
  color: var(--ink);
}

/* ---------------------------------- Mobile -------------------------------- */

@media (max-width: 840px) {
  .certs-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 720px) {
  .nav-links {
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background: var(--canvas);
    border-bottom: 1px solid var(--hairline);
    padding: var(--sp-2) clamp(1.25rem, 4vw, 2rem) var(--sp-5);
    transform: translateY(-8px);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: opacity var(--transition-fast), transform var(--transition-fast),
      visibility var(--transition-fast);
  }

  .nav-links[data-open="true"] {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
  }

  .nav-links a {
    padding: var(--sp-3) 0;
    border-bottom: 1px solid var(--hairline);
    width: 100%;
  }

  .nav-links a.is-active {
    border-bottom-color: var(--hairline);
    color: var(--accent);
  }

  .nav-toggle {
    display: inline-flex;
  }

  .nav-resume-link {
    display: none;
  }

  .about-note {
    font-size: 0.9375rem;
  }

  .edu-item {
    flex-direction: column;
    gap: var(--sp-2);
  }

  .edu-meta {
    text-align: left;
  }

  .certs-grid {
    grid-template-columns: minmax(0, 1fr);
    gap: var(--sp-6);
  }

  .additional-item {
    grid-template-columns: minmax(0, 1fr);
    gap: var(--sp-1);
  }
}

@media (max-width: 560px) {
  .skills-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .footer-inner {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--sp-3);
  }

  .hero-actions .btn span {
    display: inline;
  }
}