/* ==========================================================================
   Design tokens
   A warm, paper-like light theme with a single deep-teal accent, paired
   with an ink-dark mode. Headlines use Space Grotesk, body text uses
   Inter, and code-flavored elements use JetBrains Mono — a nod to the
   subject matter (a Python backend developer) without leaning on a
   default "terminal" cliché.
   ========================================================================== */

:root {
  --bg: #F7F5EF;
  --bg-alt: #EFEBE0;
  --panel: #FFFFFF;
  --ink: #1B1F23;
  --ink-soft: #565F66;
  --ink-faint: #8A9096;
  --border: #DEDACD;
  --accent: #0F6B5C;
  --accent-ink: #FFFFFF;
  --accent-soft: #DCEBE6;
  --amber: #B5730A;

  --font-display: 'Space Grotesk', 'Segoe UI', sans-serif;
  --font-body: 'Inter', 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'Courier New', monospace;

  --container: 1100px;
  --radius-sm: 6px;
  --radius-md: 10px;
  --shadow-panel: 0 1px 2px rgba(27, 31, 35, 0.04), 0 12px 28px -16px rgba(27, 31, 35, 0.18);

  color-scheme: light;
}

html[data-theme="dark"] {
  --bg: #12171B;
  --bg-alt: #182025;
  --panel: #1A2226;
  --ink: #EDEAE2;
  --ink-soft: #A9B2AF;
  --ink-faint: #6E7A78;
  --border: #2A3439;
  --accent: #4FB89E;
  --accent-ink: #0B1210;
  --accent-soft: #1E2E2B;
  --amber: #E0A22D;
  --shadow-panel: 0 1px 2px rgba(0, 0, 0, 0.3), 0 20px 40px -20px rgba(0, 0, 0, 0.6);

  color-scheme: dark;
}

/* ==========================================================================
   Reset & base
   ========================================================================== */

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

html {
  scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  transition: background-color 0.25s ease, color 0.25s ease;
}

h1, h2, h3 {
  font-family: var(--font-display);
  color: var(--ink);
  line-height: 1.15;
  margin: 0;
}

p { margin: 0 0 1em; color: var(--ink-soft); }
p:last-child { margin-bottom: 0; }

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

ul, ol { margin: 0; padding: 0; list-style: none; }

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

button {
  font-family: inherit;
  cursor: pointer;
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

.section-inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}

.section { padding: 88px 0; }

.section-title {
  font-size: clamp(1.6rem, 1.2rem + 1.6vw, 2.1rem);
  font-weight: 600;
  margin-bottom: 40px;
  max-width: 20ch;
}

.section-lead {
  margin-top: -24px;
  margin-bottom: 32px;
  max-width: 56ch;
}

.resume-heading-row {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
  margin-bottom: 40px;
}
.resume-heading-row .section-title { margin-bottom: 0; }

.btn-icon {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.icon-download { flex-shrink: 0; }

/* ==========================================================================
   Nav
   ========================================================================== */

.site-nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}

.nav-inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 16px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.nav-brand {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.1rem;
}
.nav-brand .dot { color: var(--accent); }

.nav-links {
  display: flex;
  gap: 28px;
  margin-left: auto;
  margin-right: 8px;
}

.nav-links a {
  font-size: 0.94rem;
  color: var(--ink-soft);
  position: relative;
  padding: 4px 0;
  transition: color 0.15s ease;
}
.nav-links a:hover { color: var(--ink); }
.nav-links a::after {
  content: "";
  position: absolute;
  left: 0; right: 100%;
  bottom: 0;
  height: 1px;
  background: var(--accent);
  transition: right 0.2s ease;
}
.nav-links a:hover::after { right: 0; }

.theme-toggle {
  background: none;
  border: none;
  padding: 0;
}
.theme-toggle-track {
  display: block;
  width: 44px;
  height: 24px;
  border-radius: 999px;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  position: relative;
  transition: background 0.2s ease;
}
.theme-toggle-thumb {
  position: absolute;
  top: 2px;
  left: 2px;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--accent);
  transition: transform 0.2s ease;
}
html[data-theme="dark"] .theme-toggle-thumb {
  transform: translateX(20px);
}

.nav-burger {
  display: none;
  flex-direction: column;
  gap: 4px;
  background: none;
  border: none;
  padding: 6px;
}
.nav-burger span {
  width: 20px;
  height: 2px;
  background: var(--ink);
  display: block;
}

.nav-links-mobile {
  display: none;
  flex-direction: column;
  padding: 8px 24px 20px;
  border-top: 1px solid var(--border);
}
.nav-links-mobile a {
  padding: 12px 0;
  border-bottom: 1px solid var(--border);
  color: var(--ink-soft);
}
.nav-links-mobile a:last-child { border-bottom: none; }

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

.hero { padding: 72px 0 96px; }

.hero-inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 56px;
  align-items: center;
}

.hero-kicker {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--accent);
  margin-bottom: 18px;
}

.hero-title {
  font-size: clamp(2rem, 1.5rem + 2.2vw, 3rem);
  font-weight: 600;
  letter-spacing: -0.01em;
  margin-bottom: 22px;
}

.hero-tagline {
  font-size: 1.08rem;
  max-width: 46ch;
  margin-bottom: 32px;
}

.hero-actions {
  display: flex;
  gap: 14px;
  margin-bottom: 48px;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 13px 24px;
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-weight: 500;
  border: 1px solid transparent;
  transition: transform 0.15s ease, background 0.15s ease, border-color 0.15s ease;
}
.btn:hover { transform: translateY(-1px); }

.btn-primary {
  background: var(--accent);
  color: var(--accent-ink);
}
.btn-primary:hover { background: color-mix(in srgb, var(--accent) 88%, black); }

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

.hero-meta {
  display: flex;
  gap: 36px;
  flex-wrap: wrap;
  border-top: 1px solid var(--border);
  padding-top: 28px;
}
.hero-meta-item { display: flex; flex-direction: column; gap: 4px; }
.hero-meta-num {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.3rem;
}
.hero-meta-label {
  font-size: 0.82rem;
  color: var(--ink-faint);
  max-width: 16ch;
}

/* Code panel visual */
.code-panel {
  background: #10171A;
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-panel);
  border: 1px solid var(--border);
}
.code-panel-bar {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 16px;
  background: #0C1214;
  border-bottom: 1px solid rgba(255,255,255,0.06);
}
.code-dot {
  width: 9px; height: 9px;
  border-radius: 50%;
  background: #3A4448;
}
.code-panel-name {
  margin-left: 10px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: #8A9BA0;
}
.code-panel-body {
  margin: 0;
  padding: 22px 20px 26px;
  font-family: var(--font-mono);
  font-size: 0.86rem;
  line-height: 1.7;
  overflow-x: auto;
  color: #C9D6D5;
}
.c-kw   { color: #E0A22D; }
.c-cls  { color: #4FB89E; }
.c-fn   { color: #6FB3E0; }
.c-self { color: #C9D6D5; opacity: 0.7; }
.c-str  { color: #B7D67A; }
.c-bool { color: #E0A22D; }
.cursor {
  display: inline-block;
  width: 7px;
  background: #4FB89E;
  animation: blink 1.1s steps(1) infinite;
}
@keyframes blink { 50% { opacity: 0; } }

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

.about { background: var(--bg-alt); }

.about-grid {
  display: grid;
  grid-template-columns: 1.4fr 0.9fr;
  gap: 56px;
  align-items: start;
}

.about-facts {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 26px;
}
.about-facts h3 {
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 18px;
}
.fact-row {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding: 12px 0;
  border-top: 1px solid var(--border);
}
.fact-row:first-of-type { border-top: none; padding-top: 0; }
.fact-row dt {
  color: var(--ink-faint);
  font-size: 0.85rem;
  flex-shrink: 0;
}
.fact-row dd {
  margin: 0;
  text-align: right;
  font-size: 0.9rem;
  color: var(--ink);
}

/* ==========================================================================
   Resume
   ========================================================================== */

.resume-columns {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 56px;
  margin-bottom: 56px;
}

.resume-col-title {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 22px;
}
.resume-col-title-spaced { margin-top: 36px; }

.timeline { display: flex; flex-direction: column; gap: 26px; }

.timeline-item {
  display: grid;
  grid-template-columns: 12px 1fr;
  gap: 16px;
}
.timeline-marker {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--accent);
  margin-top: 6px;
}
.timeline-role { font-weight: 600; color: var(--ink); margin: 0 0 2px; }
.timeline-org { color: var(--ink-soft); margin: 0 0 2px; font-size: 0.92rem; }
.timeline-date {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--ink-faint);
  margin: 0 0 8px;
}
.timeline-desc { font-size: 0.92rem; margin: 0; }

.achievement-list { display: flex; flex-direction: column; gap: 12px; }
.achievement-list li {
  position: relative;
  padding-left: 18px;
  font-size: 0.92rem;
  color: var(--ink-soft);
}
.achievement-list li::before {
  content: "";
  position: absolute;
  left: 0; top: 8px;
  width: 6px; height: 6px;
  background: var(--amber);
  border-radius: 1px;
}

.skills-block {
  border-top: 1px solid var(--border);
  padding-top: 40px;
}
.skills-group { margin-bottom: 22px; }
.skills-group:last-child { margin-bottom: 0; }
.skills-group-label {
  font-size: 0.82rem;
  color: var(--ink-faint);
  margin-bottom: 12px;
}

.tag-list { display: flex; flex-wrap: wrap; gap: 10px; }
.tag-list-tight { gap: 8px; margin: 16px 0 20px; }

.tag {
  font-size: 0.84rem;
  padding: 7px 14px;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent);
  font-weight: 500;
  border: 1px solid transparent;
}
.tag-alt {
  background: transparent;
  border-color: var(--border);
  color: var(--ink-soft);
}
.tag-sm {
  font-size: 0.76rem;
  padding: 5px 11px;
}

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

.project-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.project-card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 28px;
  display: flex;
  flex-direction: column;
  transition: border-color 0.2s ease, transform 0.2s ease;
}
.project-card:hover {
  border-color: var(--accent);
  transform: translateY(-3px);
}
.project-card h3 {
  font-size: 1.1rem;
  margin-bottom: 10px;
}
.project-card p {
  font-size: 0.92rem;
  flex-grow: 1;
}
.project-link {
  margin-top: 18px;
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--accent);
  align-self: flex-start;
  border-bottom: 1px solid transparent;
}
.project-link:hover { border-bottom-color: var(--accent); }

/* ==========================================================================
   FAQ / Accordion
   ========================================================================== */

.faq { background: var(--bg-alt); }

.accordion {
  border-top: 1px solid var(--border);
}
.accordion-item { border-bottom: 1px solid var(--border); }

.accordion-trigger {
  width: 100%;
  background: none;
  border: none;
  padding: 22px 4px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 20px;
  font-family: var(--font-display);
  font-size: 1.02rem;
  font-weight: 500;
  color: var(--ink);
  text-align: left;
}

.accordion-icon {
  font-family: var(--font-mono);
  font-size: 1.1rem;
  color: var(--accent);
  flex-shrink: 0;
  transition: transform 0.2s ease;
}
.accordion-trigger[aria-expanded="true"] .accordion-icon {
  transform: rotate(45deg);
}

.accordion-panel {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.25s ease;
}
.accordion-panel p {
  padding: 0 4px 22px;
  max-width: 62ch;
  font-size: 0.95rem;
}

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

.contact-grid {
  display: grid;
  grid-template-columns: 0.85fr 1.15fr;
  gap: 56px;
}

.social-list {
  margin-top: 32px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.social-list a {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 16px;
  padding: 14px 0;
  border-top: 1px solid var(--border);
  transition: color 0.15s ease;
}
.social-list li:last-child a { border-bottom: 1px solid var(--border); }
.social-list a:hover { color: var(--accent); }
.social-label { font-size: 0.82rem; color: var(--ink-faint); }
.social-value { font-family: var(--font-mono); font-size: 0.85rem; }

.contact-form {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 32px;
  box-shadow: var(--shadow-panel);
}

.form-field { margin-bottom: 20px; }
.form-field label {
  display: block;
  font-size: 0.85rem;
  color: var(--ink-soft);
  margin-bottom: 8px;
}
.form-field input,
.form-field textarea {
  width: 100%;
  padding: 12px 14px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 0.95rem;
  resize: vertical;
  transition: border-color 0.15s ease;
}
.form-field input:focus,
.form-field textarea:focus {
  border-color: var(--accent);
  outline: none;
}
.form-field.has-error input,
.form-field.has-error textarea {
  border-color: #C0392B;
}
.form-error {
  margin: 6px 0 0;
  font-size: 0.8rem;
  color: #C0392B;
  min-height: 1em;
}

.form-submit { width: 100%; margin-top: 4px; }
.form-submit:disabled { opacity: 0.6; cursor: not-allowed; transform: none; }

.form-status {
  margin: 14px 0 0;
  font-size: 0.88rem;
  min-height: 1.2em;
}
.form-status.success { color: var(--accent); }
.form-status.error { color: #C0392B; }

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

.site-footer {
  border-top: 1px solid var(--border);
  padding: 28px 0;
}
.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
}
.footer-inner p { font-size: 0.84rem; color: var(--ink-faint); margin: 0; }
.footer-top { font-size: 0.84rem; color: var(--ink-soft); }
.footer-top:hover { color: var(--accent); }

/* ==========================================================================
   Responsive
   ========================================================================== */

@media (max-width: 860px) {
  .hero-inner { grid-template-columns: 1fr; gap: 40px; }
  .about-grid { grid-template-columns: 1fr; }
  .resume-columns { grid-template-columns: 1fr; gap: 40px; }
  .project-grid { grid-template-columns: 1fr 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .br-desktop { display: none; }
}

@media (max-width: 640px) {
  .section { padding: 64px 0; }
  .nav-links { display: none; }
  .nav-burger { display: flex; }
  .nav-links-mobile.open { display: flex; }
  .project-grid { grid-template-columns: 1fr; }
  .hero-meta { gap: 24px; }
  .contact-form { padding: 22px; }
  .fact-row { flex-direction: column; gap: 4px; }
  .fact-row dd { text-align: left; }
}