/* ============================================================
   Petchouko Solomon — Portfolio
   Blue / Slate corporate-tech palette
   Mobile-first
   ============================================================ */

:root {
  --slate-900: #0f172a;
  --slate-800: #1e293b;
  --slate-700: #334155;
  --slate-600: #475569;
  --slate-500: #64748b;
  --slate-100: #dbeafe;
  --slate-50: #eff6ff;
  --blue-700: #1d4ed8;
  --blue-600: #2563eb;
  --blue-500: #3b82f6;
  --blue-100: #dbeafe;
  --green-100: #dcfce7;
  --green-700: #15803d;
  --amber-100: #fef3c7;
  --amber-700: #b45309;
  --radius: 12px;
  --shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.08);
  --shadow-md: 0 6px 24px rgba(15, 23, 42, 0.10);
  --shadow-lg: 0 12px 40px rgba(15, 23, 42, 0.14);
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    "Helvetica Neue", Arial, sans-serif;
  --touch-target: 44px;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 64px;
  -webkit-text-size-adjust: 100%;
  -webkit-overflow-scrolling: touch;
}

body {
  font-family: var(--font-sans);
  color: var(--slate-700);
  background: var(--slate-50);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

.container {
  width: min(1100px, 92%);
  margin: 0 auto;
}

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

a {
  color: var(--blue-600);
  text-decoration: none;
  min-height: var(--touch-target);
  display: inline-flex;
  align-items: center;
}

a:hover {
  color: var(--blue-700);
}

h1, h2, h3, h4 {
  color: var(--slate-900);
  line-height: 1.25;
}

/* Touch-friendly interactive elements */
button,
a,
.nav-link,
.btn,
.contact-card,
.skill-card,
.project-card,
.edu-card,
.tool-group,
.timeline-body {
  touch-action: manipulation;
  -webkit-tap-highlight-color: rgba(37, 99, 235, 0.15);
}

/* ---------- Reveal on scroll ---------- */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.reveal.visible {
  opacity: 1;
  transform: none;
}

/* ============================================================
   Navigation (mobile-first)
   ============================================================ */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background-color: #ffffff;
  border-bottom: 1px solid var(--slate-100);
  transition: box-shadow 0.3s ease;
}

.navbar.scrolled {
   box-shadow: var(--shadow-sm);
 }

 .navbar.nav-open::before {
  content: "";
  position: fixed;
  top: 64px;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(15, 23, 42, 0.3);
  z-index: 98;
  backdrop-filter: blur(2px);
 }

 .nav-inner {
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  font-size: 1.05rem;
  font-weight: 700;
  color: #fff;
  background: linear-gradient(120deg, var(--blue-600), var(--blue-500));
  padding: 0.45rem 1rem;
  border-radius: 9px;
  box-shadow: 0 4px 14px rgba(37, 99, 235, 0.35);
  letter-spacing: 0.3px;
  min-height: var(--touch-target);
  display: inline-flex;
  align-items: center;
}

.brand:hover {
  color: #fff;
  background: var(--blue-700);
}

/* Mobile nav: links stacked off-screen by default */
.nav-links {
  display: flex;
  gap: 0;
  flex-direction: column;
  align-items: flex-start;
  position: fixed;
  top: 64px;
  right: 0;
  bottom: 0;
  width: min(300px, 78vw);
  background-color: #ffffff;
  border-left: 1px solid var(--slate-100);
  padding: 2rem 2rem;
  box-shadow: var(--shadow-lg);
  transform: translateX(100%);
  transition: transform 0.35s ease;
  z-index: 99;
  backdrop-filter: none;
}

.nav-links.open {
    transform: translateX(0);
    background-color: #ffffff;
  }

  .nav-link {
  color: var(--slate-600);
  font-size: 1.05rem;
  font-weight: 500;
  padding: 0.8rem 0;
  width: 100%;
  min-height: var(--touch-target);
  display: flex;
  align-items: center;
  position: relative;
}

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

.nav-toggle {
  display: flex;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: 0;
  cursor: pointer;
  padding: 8px;
  min-width: var(--touch-target);
  min-height: var(--touch-target);
  align-items: center;
  justify-content: center;
}

.nav-toggle span {
  width: 24px;
  height: 2px;
  background: var(--slate-900);
  border-radius: 2px;
  transition: transform 0.3s ease, opacity 0.3s ease;
}

.nav-toggle.open span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle.open span:nth-child(2) {
  opacity: 0;
}

.nav-toggle.open span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ============================================================
   Hero (mobile-first)
   ============================================================ */
.hero {
  padding: 120px 0 80px;
  background:
    radial-gradient(900px 420px at 85% -10%, rgba(59, 130, 246, 0.14), transparent 65%),
    radial-gradient(700px 380px at 5% 110%, rgba(30, 41, 59, 0.08), transparent 60%),
    var(--slate-50);
  text-align: center;
}

.hero-eyebrow {
  font-size: 1rem;
  font-weight: 600;
  color: var(--blue-600);
  text-transform: uppercase;
  letter-spacing: 2px;
  margin-bottom: 0.75rem;
}

.hero-name {
  font-size: clamp(2rem, 7vw, 3.8rem);
  font-weight: 800;
  letter-spacing: -1px;
}

.hero-title {
  font-size: clamp(1rem, 2.5vw, 1.35rem);
  color: var(--slate-600);
  margin-top: 0.9rem;
  font-weight: 500;
}

.hero-location {
  margin-top: 0.8rem;
  color: var(--slate-500);
  font-size: 0.95rem;
}

.pin {
  margin-right: 4px;
}

.hero-actions {
  display: flex;
  gap: 0.8rem;
  justify-content: center;
  flex-wrap: wrap;
  margin-top: 1.5rem;
}

.hero-quick {
  margin-top: 1.8rem;
  font-size: 0.9rem;
  color: var(--slate-500);
}

.hero-quick a {
  color: var(--slate-600);
  font-weight: 500;
}

.hero-sep {
  margin: 0 0.6rem;
  color: var(--slate-300);
}

/* ============================================================
   Buttons (mobile-first with touch targets)
   ============================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: var(--touch-target);
  padding: 0.75rem 1.6rem;
  border-radius: 8px;
  font-weight: 600;
  font-size: 0.95rem;
  transition: background 0.25s ease, color 0.25s ease, transform 0.2s ease,
    box-shadow 0.25s ease;
  cursor: pointer;
  text-decoration: none;
}

.btn-primary {
  background: var(--blue-600);
  color: #fff;
  box-shadow: 0 6px 18px rgba(37, 99, 235, 0.35);
}

.btn-primary:hover {
  background: var(--blue-700);
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 8px 22px rgba(37, 99, 235, 0.4);
}

.btn-outline {
  border: 1.5px solid var(--slate-300);
  color: var(--slate-800);
  background: transparent;
}

.btn-outline:hover {
  border-color: var(--blue-600);
  color: var(--blue-600);
  transform: translateY(-2px);
}

.btn-sm {
  padding: 0.6rem 1.2rem;
  font-size: 0.85rem;
  min-height: var(--touch-target);
}

/* ============================================================
   Sections (mobile-first padding)
   ============================================================ */
.section {
  padding: 60px 0;
}

.section-title {
  font-size: clamp(1.5rem, 4vw, 2.2rem);
  font-weight: 800;
  letter-spacing: -0.5px;
  text-align: center;
  margin-bottom: 2rem;
  position: relative;
  padding: 0 1rem;
}

.section-title::after {
  content: "";
  display: block;
  width: 56px;
  height: 4px;
  background: var(--blue-600);
  border-radius: 3px;
  margin: 0.9rem auto 0;
}

.subsection-title {
  font-size: 1.2rem;
  font-weight: 700;
  margin: 2rem 0 1.2rem;
  text-align: center;
}

/* ============================================================
   About (mobile-first)
   ============================================================ */
.about {
  background: #fff;
}

.about-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
  align-items: center;
  text-align: center;
}

.about-photo {
  max-width: 240px;
  margin: 0 auto;
}

.about-photo img {
  width: 100%;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  border-radius: var(--radius);
  border: 4px solid #fff;
  outline: 1px solid var(--slate-100);
  box-shadow: var(--shadow-lg);
}

.about-text p {
  margin-bottom: 1rem;
}

.about-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  justify-content: center;
  margin-top: 1.2rem;
}

.badge {
  background: var(--blue-100);
  color: var(--blue-700);
  font-size: 0.82rem;
  font-weight: 600;
  padding: 0.4rem 0.85rem;
  border-radius: 999px;
}

/* ============================================================
   Skills (mobile-first)
   ============================================================ */
.skills {
  background: var(--slate-50);
}

.skills-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.2rem;
}

.skill-card {
  background: #fff;
  border: 1px solid var(--slate-100);
  border-radius: var(--radius);
  padding: 1.4rem;
  box-shadow: var(--shadow-sm);
  transition: transform 0.25s ease, box-shadow 0.25s ease;
  min-height: auto;
}

.skill-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.skill-head {
  font-size: 1.02rem;
  font-weight: 700;
  margin-bottom: 0.8rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.skill-icon {
  font-size: 1.3rem;
}

.skill-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.skill-list li {
  position: relative;
  padding-left: 1.15rem;
  font-size: 0.92rem;
  color: var(--slate-600);
  min-height: 1.5em;
}

.skill-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.6em;
  width: 8px;
  height: 8px;
  border-radius: 2px;
  background: var(--blue-500);
}

.tools-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.8rem;
}

.tool-group {
  background: #fff;
  border: 1px solid var(--slate-100);
  border-radius: var(--radius);
  padding: 1rem 1.2rem;
  box-shadow: var(--shadow-sm);
  min-height: auto;
}

.tool-group h4 {
  font-size: 0.9rem;
  margin-bottom: 0.3rem;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  color: var(--blue-600);
}

.tool-group p {
  font-size: 0.9rem;
  color: var(--slate-600);
}

/* ============================================================
   Experience (mobile-first)
   ============================================================ */
.experience {
  background: #fff;
}

.timeline {
  position: relative;
  max-width: 100%;
  margin: 0 auto;
  padding-left: 24px;
}

.timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: var(--slate-100);
}

.timeline-item {
  position: relative;
  padding-left: 28px;
  margin-bottom: 1.8rem;
}

.timeline-dot {
  position: absolute;
  left: -24px;
  top: 6px;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: #fff;
  border: 4px solid var(--blue-600);
  box-shadow: 0 0 0 3px var(--slate-50);
}

.timeline-body {
  background: var(--slate-50);
  border: 1px solid var(--slate-100);
  border-radius: var(--radius);
  padding: 1.2rem;
  box-shadow: var(--shadow-sm);
}

.timeline-head h3 {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 0.2rem;
}

.timeline-role {
  display: inline-block;
  font-weight: 600;
  font-size: 0.88rem;
  color: var(--blue-600);
  margin-bottom: 0.2rem;
}

.timeline-date {
  display: block;
  font-size: 0.82rem;
  color: var(--slate-500);
  margin-bottom: 0.7rem;
}

.timeline-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.timeline-list li {
  position: relative;
  padding-left: 1.15rem;
  font-size: 0.92rem;
}

.timeline-list li::before {
  content: "▹";
  position: absolute;
  left: 0;
  color: var(--blue-500);
}

/* ============================================================
   Projects (mobile-first)
   ============================================================ */
.projects {
  background: var(--slate-50);
}

.projects-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.4rem;
  max-width: 100%;
  margin: 0 auto;
}

.project-card {
  background: #fff;
  border: 1px solid var(--slate-100);
  border-radius: var(--radius);
  padding: 1.4rem;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.project-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.project-top {
  margin-bottom: 0.7rem;
}

.status {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.25rem 0.75rem;
  border-radius: 999px;
  letter-spacing: 0.3px;
}

.status-live {
  background: var(--green-100);
  color: var(--green-700);
}

.status-testing {
  background: var(--amber-100);
  color: var(--amber-700);
}

.status-affiliate {
  background: var(--blue-100);
  color: var(--blue-700);
}

.project-card h3 {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 0.25rem;
}

.project-role {
  display: block;
  font-size: 0.84rem;
  font-weight: 600;
  color: var(--blue-600);
  margin-bottom: 0.8rem;
}

.project-card p {
  font-size: 0.92rem;
  margin-bottom: 1rem;
  flex-grow: 1;
}

.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  margin-bottom: 1.1rem;
}

.project-tags span {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--slate-600);
  background: var(--slate-100);
  padding: 0.25rem 0.7rem;
  border-radius: 999px;
}

.project-links {
  display: flex;
  gap: 0.6rem;
  flex-wrap: wrap;
}

/* ============================================================
   Education & Languages (mobile-first)
   ============================================================ */
.education {
  background: #fff;
}

.edu-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.2rem;
  max-width: 100%;
  margin: 0 auto;
}

.edu-card {
  background: var(--slate-50);
  border: 1px solid var(--slate-100);
  border-left: 4px solid var(--blue-600);
  border-radius: var(--radius);
  padding: 1.3rem;
  box-shadow: var(--shadow-sm);
}

.edu-card h3 {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 0.3rem;
}

.edu-loc {
  font-size: 0.84rem;
  font-weight: 600;
  color: var(--blue-600);
  margin-bottom: 0.4rem;
}

.edu-degree {
  font-size: 0.92rem;
  margin-bottom: 0.3rem;
}

.edu-date {
  font-size: 0.82rem;
  color: var(--slate-500);
}

.languages {
  max-width: 100%;
  margin: 0 auto;
}

.lang-row {
  display: flex;
  gap: 0.8rem;
  flex-wrap: wrap;
  justify-content: center;
}

.lang {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--slate-50);
  border: 1px solid var(--slate-100);
  border-radius: 999px;
  padding: 0.5rem 1.1rem;
  box-shadow: var(--shadow-sm);
  min-height: var(--touch-target);
}

.lang strong {
  color: var(--slate-900);
}

.lang span {
  color: var(--blue-600);
  font-weight: 600;
  font-size: 0.88rem;
}

/* ============================================================
   Contact (mobile-first)
   ============================================================ */
.contact {
  background:
    radial-gradient(800px 380px at 100% 0%, rgba(59, 130, 246, 0.12), transparent 60%),
    var(--slate-50);
}

.contact-intro {
  text-align: center;
  max-width: 90%;
  margin: 0 auto 2rem;
  color: var(--slate-600);
  padding: 0 0.5rem;
}

.contact-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
  max-width: 100%;
  margin: 0 auto;
}

.contact-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.3rem;
  background: #fff;
  border: 1px solid var(--slate-100);
  border-radius: var(--radius);
  padding: 1.4rem 1rem;
  text-align: center;
  box-shadow: var(--shadow-sm);
  transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
  min-height: auto;
}

.contact-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: var(--blue-500);
  color: var(--slate-700);
}

.contact-icon {
  font-size: 1.6rem;
}

.contact-label {
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--slate-500);
}

.contact-value {
  font-weight: 600;
  color: var(--slate-900);
  font-size: 0.92rem;
  word-break: break-word;
}

/* ============================================================
   Footer (mobile-first)
   ============================================================ */
.footer {
  background: linear-gradient(120deg, #0f172a, #1e3a8a);
  color: var(--slate-100);
  padding: 1.5rem 0;
}

.footer-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.8rem;
  text-align: center;
}

.footer p {
  font-size: 0.85rem;
  color: var(--slate-100);
}

.footer-links {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  justify-content: center;
}

.footer-links a {
  color: var(--slate-100);
  font-size: 0.85rem;
  min-height: var(--touch-target);
  display: inline-flex;
  align-items: center;
}

.footer-links a:hover {
  color: var(--blue-500);
}

/* ============================================================
   Responsive (mobile-first: min-width breakpoints)
   ============================================================ */

/* Small tablets and larger (≥560px) */
@media (min-width: 560px) {
  .contact-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 1.2rem;
  }
}

/* Tablets (≥768px) */
@media (min-width: 768px) {
  .about-grid {
    grid-template-columns: 300px 1fr;
    gap: 3rem;
    text-align: left;
  }

  .about-photo {
    max-width: 100%;
    margin: 0;
  }

  .about-badges {
    justify-content: flex-start;
  }
}

/* Laptops and desktop (≥900px) */
@media (min-width: 900px) {
  /* Nav: desktop layout */
  .nav-links {
    position: static;
    width: auto;
    flex-direction: row;
    align-items: center;
    gap: 1.5rem;
    background: transparent;
    padding: 0;
    box-shadow: none;
    transform: none;
    border-left: none;
  }

  .nav-links.open {
    transform: none;
  }

  .nav-link {
    width: auto;
    padding: 0.35rem 0;
    font-size: 0.95rem;
    min-height: auto;
  }

  .nav-link::after {
    display: block;
  }

  .nav-toggle {
    display: none;
  }

  .hero {
    padding: 180px 0 130px;
  }

  .section {
    padding: 88px 0;
  }

  /* Timeline: desktop layout */
  .timeline {
    padding-left: 0;
    max-width: 820px;
  }

  .timeline::before {
    left: 11px;
  }

  .timeline-item {
    padding-left: 44px;
    margin-bottom: 2.2rem;
  }

  .timeline-dot {
    left: 0;
    width: 24px;
    height: 24px;
    border-width: 5px;
  }

  /* Skills grid */
  .skills-grid {
    grid-template-columns: repeat(auto-fit, minmax(290px, 1fr));
    gap: 1.4rem;
  }

  /* Tools grid */
  .tools-grid {
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 1rem;
  }

  /* Projects grid */
  .projects-grid {
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.6rem;
    max-width: 980px;
  }

  /* Education grid */
  .edu-grid {
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.4rem;
    max-width: 940px;
  }

  .footer-inner {
    flex-direction: row;
    justify-content: space-between;
    text-align: left;
  }
}

/* Large desktop (≥1200px) */
@media (min-width: 1200px) {
  .contact-grid {
    grid-template-columns: repeat(4, 1fr);
    gap: 1.2rem;
  }

  .contact-card {
    padding: 1.6rem 1.2rem;
  }

  .contact-value {
    font-size: 0.95rem;
  }
}

/* ============================================================
   Accessibility
   ============================================================ */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }

  * {
    transition: none !important;
  }
}

/* High contrast mode support */
@media (prefers-contrast: high) {
  :root {
    --slate-700: #000;
    --slate-500: #333;
  }

  .skill-card,
  .project-card,
  .edu-card,
  .tool-group,
  .timeline-body,
  .contact-card {
    border-width: 2px;
  }
}

/* Dark mode support */
@media (prefers-color-scheme: dark) {
  :root {
    --slate-50: #1a1a2e;
    --slate-700: #cbd5e1;
    --slate-900: #f1f5f9;
    --slate-100: #1e293b;
    --blue-100: #1e3a5f;
    --green-100: #0d3d2a;
    --amber-100: #3d2f0d;
  }

  body {
    background: #0f172a;
    color: #cbd5e1;
  }

  .about,
  .experience,
  .education,
  .skills,
  .projects,
  .contact {
    background: transparent;
  }

  .skill-card,
  .project-card,
  .edu-card,
  .tool-group,
  .timeline-body,
  .contact-card,
  .navbar {
    background: #1e293b;
    border-color: #334155;
  }

  .about-photo img {
    border-color: #334155;
  }
}