/* =========================================================
   Wagner Djive — Portfolio
   Design system: Minimalism & Swiss Style + Professional Navy/Blue
   Typography: Poppins (headings) / Open Sans (body)
   ========================================================= */

:root {
  --color-primary: #0F172A;
  --color-on-primary: #FFFFFF;
  --color-secondary: #334155;
  --color-accent: #0369A1;
  --color-accent-strong: #0284C7;
  --color-on-accent: #FFFFFF;

  --color-background: #F8FAFC;
  --color-foreground: #0F172A;
  --color-card: #FFFFFF;
  --color-card-foreground: #0F172A;
  --color-muted: #EEF2F6;
  --color-muted-foreground: #475569;
  --color-border: #E2E8F0;
  --color-ring: #0369A1;

  --font-heading: 'Poppins', system-ui, sans-serif;
  --font-body: 'Open Sans', system-ui, sans-serif;

  --space-1: 0.5rem;
  --space-2: 0.75rem;
  --space-3: 1rem;
  --space-4: 1.5rem;
  --space-5: 2rem;
  --space-6: 3rem;
  --space-7: 4.5rem;
  --space-8: 6rem;

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;

  --shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.06);
  --shadow-md: 0 8px 24px -8px rgba(15, 23, 42, 0.16);
  --shadow-lg: 0 20px 45px -20px rgba(15, 23, 42, 0.28);

  --transition: 200ms ease;
  --header-h: 72px;

  color-scheme: light;
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --color-primary: #F8FAFC;
  --color-on-primary: #0B1220;
  --color-secondary: #94A3B8;
  --color-accent: #38BDF8;
  --color-accent-strong: #7DD3FC;
  --color-on-accent: #08131F;

  --color-background: #0B1220;
  --color-foreground: #F1F5F9;
  --color-card: #121B2E;
  --color-card-foreground: #F1F5F9;
  --color-muted: #17223A;
  --color-muted-foreground: #94A3B8;
  --color-border: #223045;
  --color-ring: #38BDF8;

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 8px 24px -8px rgba(0, 0, 0, 0.5);
  --shadow-lg: 0 20px 45px -20px rgba(0, 0, 0, 0.6);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark;
    --color-primary: #F8FAFC;
    --color-on-primary: #0B1220;
    --color-secondary: #94A3B8;
    --color-accent: #38BDF8;
    --color-accent-strong: #7DD3FC;
    --color-on-accent: #08131F;

    --color-background: #0B1220;
    --color-foreground: #F1F5F9;
    --color-card: #121B2E;
    --color-card-foreground: #F1F5F9;
    --color-muted: #17223A;
    --color-muted-foreground: #94A3B8;
    --color-border: #223045;
    --color-ring: #38BDF8;

    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 8px 24px -8px rgba(0, 0, 0, 0.5);
    --shadow-lg: 0 20px 45px -20px rgba(0, 0, 0, 0.6);
  }
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
@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; }
}

body {
  margin: 0;
  background: var(--color-background);
  color: var(--color-foreground);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

h1, h2, h3, h4 {
  font-family: var(--font-heading);
  color: var(--color-foreground);
  line-height: 1.2;
  margin: 0;
  font-weight: 600;
}

p { margin: 0; }
ul { margin: 0; padding: 0; list-style: none; }
a { color: inherit; text-decoration: none; }

.container {
  width: 100%;
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 var(--space-4);
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--color-primary);
  color: var(--color-on-primary);
  padding: var(--space-2) var(--space-3);
  z-index: 200;
  border-radius: var(--radius-sm);
}
.skip-link:focus {
  left: var(--space-3);
  top: var(--space-3);
}

:focus-visible {
  outline: 3px solid var(--color-ring);
  outline-offset: 2px;
  border-radius: 4px;
}

.icon { width: 20px; height: 20px; flex-shrink: 0; }
.icon-sm { width: 16px; height: 16px; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: 0.75rem 1.25rem;
  border-radius: var(--radius-sm);
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 0.95rem;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform var(--transition), background var(--transition), border-color var(--transition), box-shadow var(--transition);
  white-space: nowrap;
}
.btn:hover { transform: translateY(-1px); }
.btn .icon { width: 18px; height: 18px; }

.btn-primary {
  background: var(--color-primary);
  color: var(--color-on-primary);
}
.btn-primary:hover { background: var(--color-accent); box-shadow: var(--shadow-md); }

.btn-ghost {
  background: transparent;
  color: var(--color-foreground);
  border-color: var(--color-border);
}
.btn-ghost:hover { border-color: var(--color-accent); color: var(--color-accent); }

.btn-small { padding: 0.55rem 0.9rem; font-size: 0.85rem; }

.icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  background: transparent;
  border: 1px solid var(--color-border);
  color: var(--color-foreground);
  cursor: pointer;
  transition: border-color var(--transition), color var(--transition);
}
.icon-btn:hover { border-color: var(--color-accent); color: var(--color-accent); }

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: color-mix(in srgb, var(--color-background) 88%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border);
  height: var(--header-h);
  display: flex;
  align-items: center;
}

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

.brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1rem;
}
.brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border-radius: var(--radius-sm);
  background: var(--color-primary);
  color: var(--color-on-primary);
  font-weight: 700;
  font-size: 0.9rem;
}

.main-nav ul {
  display: flex;
  gap: var(--space-5);
}
.main-nav a {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--color-muted-foreground);
  transition: color var(--transition);
}
.main-nav a:hover { color: var(--color-accent); }

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.nav-toggle { display: none; }
.icon-moon { display: none; }
:root[data-theme="dark"] .icon-sun { display: none; }
:root[data-theme="dark"] .icon-moon { display: block; }

/* ---------- Hero ---------- */
.hero {
  padding: var(--space-8) 0 var(--space-7);
  border-bottom: 1px solid var(--color-border);
}
.hero-inner {
  display: grid;
  grid-template-columns: 1.3fr 1fr;
  gap: var(--space-7);
  align-items: center;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-accent);
  background: color-mix(in srgb, var(--color-accent) 12%, transparent);
  padding: 0.4rem 0.85rem;
  border-radius: 999px;
  margin-bottom: var(--space-4);
}
.dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-accent);
}

.hero h1 {
  font-size: clamp(2rem, 4.2vw, 3rem);
  font-weight: 700;
  letter-spacing: -0.01em;
  margin-bottom: var(--space-2);
}

.hero-role {
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 1.15rem;
  color: var(--color-accent);
  margin-bottom: var(--space-3);
}

.hero-summary {
  max-width: 52ch;
  font-size: 1.05rem;
  color: var(--color-muted-foreground);
  margin-bottom: var(--space-4);
}

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
  margin-bottom: var(--space-5);
}
.hero-meta span {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--color-muted-foreground);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
}

.hero-stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3);
}
.stat-card {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
  box-shadow: var(--shadow-sm);
}
.stat-value {
  display: block;
  font-family: var(--font-heading);
  font-size: 2.2rem;
  font-weight: 700;
  color: var(--color-accent);
  margin-bottom: 0.25rem;
}
.stat-label {
  display: block;
  font-size: 0.85rem;
  color: var(--color-muted-foreground);
  font-weight: 600;
  line-height: 1.4;
}

/* ---------- Sections ---------- */
.section { padding: var(--space-8) 0; }
.section-alt { background: var(--color-muted); }

.section-head { max-width: 62ch; margin-bottom: var(--space-6); }
.kicker {
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: var(--space-2);
}
.section-head h2 {
  font-size: clamp(1.6rem, 3vw, 2.1rem);
  font-weight: 700;
}
.section-sub {
  margin-top: var(--space-2);
  color: var(--color-muted-foreground);
  font-size: 1.05rem;
}

/* ---------- About ---------- */
.about-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: var(--space-6);
  align-items: start;
}
.about-lead { font-size: 1.15rem; color: var(--color-foreground); }
.about-points { display: flex; flex-direction: column; gap: var(--space-4); }
.point { display: flex; gap: var(--space-3); align-items: flex-start; }
.point .icon { color: var(--color-accent); margin-top: 2px; }
.point p { color: var(--color-muted-foreground); font-weight: 600; }

/* ---------- Timeline ---------- */
.timeline {
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
  position: relative;
  border-left: 2px solid var(--color-border);
  margin-left: 7px;
  padding-left: var(--space-5);
}
.timeline-item { position: relative; }
.timeline-marker {
  position: absolute;
  left: calc(-1 * var(--space-5) - 7px);
  top: 6px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--color-accent);
  border: 3px solid var(--color-background);
  box-shadow: 0 0 0 2px var(--color-accent);
}
.timeline-card {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-4) var(--space-5);
  box-shadow: var(--shadow-sm);
}
.timeline-top {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: baseline;
  gap: var(--space-2);
  margin-bottom: 0.15rem;
}
.timeline-top h3 { font-size: 1.15rem; }
.timeline-date {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--color-accent);
  white-space: nowrap;
}
.timeline-org {
  font-weight: 600;
  color: var(--color-muted-foreground);
  margin-bottom: var(--space-3);
}
.timeline-card ul { display: flex; flex-direction: column; gap: 0.5rem; }
.timeline-card li {
  position: relative;
  padding-left: 1.1rem;
  color: var(--color-muted-foreground);
  font-size: 0.96rem;
}
.timeline-card li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.6em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-accent);
}

/* ---------- Projects ---------- */
.subsection-title {
  font-size: 1.1rem;
  font-weight: 700;
  margin: var(--space-6) 0 var(--space-4);
}
.subsection-title:first-of-type { margin-top: 0; }

.grid { display: grid; gap: var(--space-4); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }

.project-card {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}
.project-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-md); }
.project-card h4 { font-size: 1.1rem; }
.project-card p { color: var(--color-muted-foreground); font-size: 0.95rem; }

.project-card-top { display: flex; }
.project-tag {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  color: var(--color-accent);
  background: color-mix(in srgb, var(--color-accent) 12%, transparent);
  padding: 0.3rem 0.7rem;
  border-radius: 999px;
}

.project-card-featured { border-color: color-mix(in srgb, var(--color-accent) 35%, var(--color-border)); }

.tag-list { display: flex; flex-wrap: wrap; gap: 0.4rem; margin-top: 0.4rem; }
.tag-list li {
  font-size: 0.78rem;
  font-weight: 600;
  padding: 0.3rem 0.6rem;
  border-radius: var(--radius-sm);
  background: var(--color-muted);
  color: var(--color-muted-foreground);
}

.project-card-compact { padding: var(--space-4); }
.project-card-compact h4 { font-size: 1rem; }
.project-card-compact p { font-size: 0.88rem; }

/* ---------- Skills ---------- */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-4);
}
.skill-card {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  box-shadow: var(--shadow-sm);
}
.skill-icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  background: color-mix(in srgb, var(--color-accent) 14%, transparent);
  color: var(--color-accent);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-3);
}
.skill-card h3 { font-size: 1.05rem; margin-bottom: 0.4rem; }
.skill-card p { color: var(--color-muted-foreground); font-size: 0.92rem; }

/* ---------- Credentials ---------- */
.credentials-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-6);
}
.subsection-title-sm {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 1rem;
  margin-bottom: var(--space-3);
}
.subsection-title-sm .icon { color: var(--color-accent); }
.subsection-title-sm-spaced { margin-top: var(--space-5); }

.cred-list { display: flex; flex-direction: column; gap: 0.65rem; }
.cred-list li {
  position: relative;
  padding-left: 1.2rem;
  color: var(--color-muted-foreground);
  font-size: 0.95rem;
}
.cred-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-accent);
}

.edu-card {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
  box-shadow: var(--shadow-sm);
}
.edu-degree { font-weight: 700; margin-bottom: 0.25rem; }
.edu-school { color: var(--color-muted-foreground); font-size: 0.92rem; margin-bottom: 0.5rem; }
.edu-thesis { font-size: 0.88rem; color: var(--color-muted-foreground); font-style: italic; }

/* ---------- Writing ---------- */
.writing-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-3);
}
.writing-link {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-3) var(--space-4);
  cursor: pointer;
  transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition);
}
.writing-link:hover {
  transform: translateY(-2px);
  border-color: var(--color-accent);
  box-shadow: var(--shadow-sm);
}
.writing-link .icon { color: var(--color-accent); flex-shrink: 0; }
.writing-link span { font-weight: 600; font-size: 0.95rem; flex: 1; }
.writing-link .icon-external {
  color: var(--color-muted-foreground);
  opacity: 0;
  transform: translate(-2px, 2px);
  transition: opacity var(--transition), transform var(--transition), color var(--transition);
}
.writing-link:hover .icon-external,
.writing-link:focus-visible .icon-external {
  opacity: 1;
  transform: translate(0, 0);
  color: var(--color-accent);
}

/* ---------- Contact ---------- */
.contact-inner { text-align: center; }
.contact-inner > .reveal:first-child { max-width: 56ch; margin: 0 auto var(--space-6); }
.contact-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: var(--space-3);
  text-align: left;
}
.contact-card {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), border-color var(--transition);
}
.contact-card:hover { transform: translateY(-3px); border-color: var(--color-accent); }
.contact-card .icon { color: var(--color-accent); width: 24px; height: 24px; }
.contact-card strong { display: block; font-size: 0.85rem; margin-bottom: 0.15rem; }
.contact-card span { font-size: 0.88rem; color: var(--color-muted-foreground); overflow-wrap: anywhere; }

/* ---------- Footer ---------- */
.site-footer { border-top: 1px solid var(--color-border); padding: var(--space-5) 0; }
.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-3);
  font-size: 0.88rem;
  color: var(--color-muted-foreground);
}
.back-to-top {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-weight: 600;
  color: var(--color-foreground);
}
.back-to-top:hover { color: var(--color-accent); }

/* ---------- Reveal animation ---------- */
.reveal {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 0.4s ease-out, transform 0.4s ease-out;
}
.reveal.is-visible { opacity: 1; transform: translateY(0); }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; }
}

/* ---------- Responsive ---------- */
@media (max-width: 1024px) {
  .hero-inner { grid-template-columns: 1fr; }
  .about-grid { grid-template-columns: 1fr; }
  .credentials-grid { grid-template-columns: 1fr; }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .skills-grid { grid-template-columns: repeat(2, 1fr); }
  .contact-cards { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 860px) {
  .main-nav {
    position: fixed;
    inset: var(--header-h) 0 0 0;
    background: var(--color-background);
    padding: var(--space-5) var(--space-4);
    transform: translateX(100%);
    transition: transform var(--transition);
    overflow-y: auto;
  }
  .main-nav.is-open { transform: translateX(0); }
  .main-nav ul { flex-direction: column; gap: var(--space-1); }
  .main-nav a {
    display: block;
    padding: var(--space-3);
    font-size: 1.1rem;
    border-bottom: 1px solid var(--color-border);
  }
  .nav-toggle { display: inline-flex; }
  .icon-close { display: none; }
  .nav-toggle[aria-expanded="true"] .icon-menu { display: none; }
  .nav-toggle[aria-expanded="true"] .icon-close { display: block; }
  .btn-small span { display: none; }
}

@media (max-width: 640px) {
  .hero { padding: var(--space-6) 0 var(--space-5); }
  .hero-stats { grid-template-columns: 1fr 1fr; }
  .section { padding: var(--space-6) 0; }
  .grid-2, .grid-3, .skills-grid, .contact-cards, .writing-list { grid-template-columns: 1fr; }
  .timeline { margin-left: 0; padding-left: var(--space-4); }
}