/* ==========================================================================
   Huseyn Gasimov — Portfolio
   Minimalist · professional · modern · elegant
   ========================================================================== */

:root {
  --font-serif: 'Fraunces', Georgia, serif;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'Source Code Pro', ui-monospace, 'SFMono-Regular', monospace;
  --max-width: 1100px;
  --nav-height: 68px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

[data-theme="light"] {
  --bg: #faf9f7;
  --surface: #ffffff;
  --text: #1a1a1a;
  --text-secondary: #5c5c5c;
  --text-muted: #8a8a8a;
  --border: rgba(0, 0, 0, 0.08);
  --border-strong: rgba(0, 0, 0, 0.16);
  --accent: #1e3a8a;
  --accent-soft: rgba(30, 58, 138, 0.08);
  --nav-bg: rgba(250, 249, 247, 0.85);
}

[data-theme="dark"] {
  --bg: #0a0f1e;
  --surface: #111827;
  --text: #e7eaf3;
  --text-secondary: #9aa3b8;
  --text-muted: #6b7280;
  --border: rgba(255, 255, 255, 0.08);
  --border-strong: rgba(255, 255, 255, 0.18);
  --accent: #6b9dff;
  --accent-soft: rgba(107, 157, 255, 0.1);
  --nav-bg: rgba(10, 15, 30, 0.85);
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  font-weight: 400;
  background-color: var(--bg);
  color: var(--text);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background-color 0.35s ease, color 0.35s ease;
}

::selection {
  background: var(--accent);
  color: var(--bg);
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 2rem;
}

/* ---------- Typography ---------- */
h1, h2, h3 {
  font-family: var(--font-serif);
  font-weight: 500;
  line-height: 1.15;
  letter-spacing: -0.01em;
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 400;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  color: var(--accent);
  margin-bottom: 1.25rem;
}

.section-title {
  font-size: clamp(2rem, 4.5vw, 3rem);
  margin-bottom: 3rem;
}

/* ---------- Navigation ---------- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  z-index: 100;
  background: var(--nav-bg);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  transition: background-color 0.35s ease, border-color 0.35s ease;
}

.nav.nav-scrolled {
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
}

.nav-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 2rem;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  font-family: var(--font-serif);
  font-size: 1.35rem;
  font-weight: 600;
  color: var(--text);
  text-decoration: none;
  letter-spacing: -0.01em;
}

.logo-dot {
  color: var(--accent);
}

.nav-right {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.nav-links {
  list-style: none;
  display: flex;
  gap: 2rem;
}

.nav-links a {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  text-decoration: none;
  color: var(--text-secondary);
  letter-spacing: 0.02em;
  transition: color 0.2s ease;
}

.nav-links a:hover {
  color: var(--text);
}

.nav-links a.active {
  color: var(--accent);
}

.theme-toggle {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border: 1px solid var(--border);
  border-radius: 50%;
  background: transparent;
  color: var(--text-secondary);
  cursor: pointer;
  transition: color 0.2s ease, border-color 0.2s ease, background-color 0.2s ease;
}

.theme-toggle:hover {
  color: var(--text);
  border-color: var(--border-strong);
  background: var(--accent-soft);
}

.icon {
  position: absolute;
  inset: 0;
  margin: auto;
  transition: opacity 0.25s ease, transform 0.35s ease;
}

.icon-sun { opacity: 0; transform: rotate(-60deg) scale(0.6); }
.icon-moon { opacity: 1; transform: rotate(0) scale(1); }

[data-theme="dark"] .icon-sun { opacity: 1; transform: rotate(0) scale(1); }
[data-theme="dark"] .icon-moon { opacity: 0; transform: rotate(60deg) scale(0.6); }

/* Mobile nav toggle */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  padding: 0 9px;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 50%;
  cursor: pointer;
}

.nav-toggle span {
  display: block;
  width: 100%;
  height: 1.5px;
  background: var(--text);
  transition: transform 0.3s ease, opacity 0.3s ease;
}

.nav.nav-open .nav-toggle span:nth-child(1) {
  transform: translateY(6.5px) rotate(45deg);
}

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

.nav.nav-open .nav-toggle span:nth-child(3) {
  transform: translateY(-6.5px) rotate(-45deg);
}

/* ---------- Hero ---------- */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: var(--nav-height);
  padding-bottom: 4rem;
}

.hero-name {
  font-size: clamp(3.25rem, 11vw, 7.5rem);
  font-weight: 500;
  line-height: 0.98;
  margin: 1.25rem 0 1.5rem;
  letter-spacing: -0.02em;
}

.hero-role {
  font-size: clamp(1.35rem, 3vw, 1.9rem);
  font-family: var(--font-serif);
  font-weight: 400;
  color: var(--text-secondary);
  margin-bottom: 1.25rem;
}

.hero-tagline {
  font-size: clamp(1.05rem, 2vw, 1.25rem);
  font-weight: 300;
  color: var(--text-secondary);
  max-width: 32rem;
  margin-bottom: 2.5rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 2.5rem;
}

.hero-social {
  display: flex;
  flex-wrap: wrap;
  gap: 1.75rem;
  padding-top: 1.75rem;
  border-top: 1px solid var(--border);
}

.hero-social a {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  text-decoration: none;
  color: var(--text-secondary);
  letter-spacing: 0.03em;
  transition: color 0.2s ease;
}

.hero-social a:hover {
  color: var(--accent);
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-sans);
  font-size: 0.9rem;
  font-weight: 500;
  text-decoration: none;
  padding: 0.85rem 1.75rem;
  border-radius: 999px;
  border: 1px solid transparent;
  transition: all 0.25s ease;
}

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

.btn-primary:hover {
  filter: brightness(1.08);
  transform: translateY(-1px);
}

.btn-ghost {
  background: transparent;
  color: var(--text);
  border-color: var(--border-strong);
}

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

.btn-lg {
  font-size: 1rem;
  padding: 1.05rem 2.25rem;
  margin-top: 2rem;
}

/* ---------- Sections ---------- */
.section {
  padding: 7rem 0;
  border-top: 1px solid var(--border);
}

.about-text {
  font-size: clamp(1.15rem, 2.4vw, 1.45rem);
  font-weight: 300;
  line-height: 1.7;
  color: var(--text);
  max-width: 46rem;
}

/* ---------- Inner pages ---------- */
.page {
  padding-top: calc(var(--nav-height) + 5rem);
  padding-bottom: 4rem;
}

.page-header {
  margin-bottom: 2rem;
}

.page-title {
  font-size: clamp(2.5rem, 7vw, 4.25rem);
  font-weight: 500;
}

/* ---------- Home link cards ---------- */
.home-links-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 2rem;
}

.home-link {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  padding: 2rem;
  border: 1px solid var(--border);
  border-radius: 12px;
  text-decoration: none;
  color: var(--text);
  background: var(--surface);
  transition: border-color 0.25s ease, transform 0.25s ease;
}

.home-link:hover {
  border-color: var(--border-strong);
  transform: translateY(-3px);
}

.home-link-label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--accent);
  letter-spacing: 0.12em;
}

.home-link h3 {
  font-size: 1.5rem;
  font-weight: 500;
}

.home-link p {
  font-size: 0.95rem;
  color: var(--text-secondary);
}

.home-link-arrow {
  margin-top: auto;
  font-size: 1.25rem;
  color: var(--text-muted);
  transition: color 0.25s ease, transform 0.25s ease;
}

.home-link:hover .home-link-arrow {
  color: var(--accent);
  transform: translateX(4px);
}

/* ---------- Timeline / lists ---------- */
.timeline,
.list {
  display: flex;
  flex-direction: column;
}

.timeline-item,
.list-item {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 2rem;
  padding: 2.25rem 0;
  border-bottom: 1px solid var(--border);
}

.timeline-item:first-child,
.list-item:first-child {
  padding-top: 0;
}

.timeline-item:last-child,
.list-item:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.timeline-meta {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  padding-top: 0.3rem;
}

.meta-date {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.02em;
  color: var(--text);
}

.meta-note {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-muted);
}

.item-title {
  font-size: 1.4rem;
  font-weight: 500;
  margin-bottom: 0.3rem;
}

.item-role {
  font-size: 0.98rem;
  font-weight: 500;
  color: var(--accent);
  margin-bottom: 0.2rem;
}

.item-location {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-bottom: 0.75rem;
}

.bullets {
  list-style: none;
  margin-top: 0.85rem;
}

.bullets li {
  position: relative;
  padding-left: 1.25rem;
  margin-bottom: 0.55rem;
  font-size: 0.95rem;
  color: var(--text-secondary);
}

.bullets li::before {
  content: "—";
  position: absolute;
  left: 0;
  color: var(--accent);
}

/* ---------- Skills & Languages ---------- */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 3rem;
  margin-bottom: 4rem;
}

.skill-heading {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  color: var(--accent);
  margin-bottom: 1.25rem;
}

.skill-tags {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

.skill-tags li {
  font-size: 0.88rem;
  color: var(--text-secondary);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.35rem 0.9rem;
  transition: border-color 0.2s ease, color 0.2s ease;
}

.skill-tags li:hover {
  border-color: var(--accent);
  color: var(--text);
}

.languages {
  padding-top: 2.5rem;
  border-top: 1px solid var(--border);
}

.lang-list {
  list-style: none;
}

.lang-list li {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 1rem;
  padding: 0.7rem 0;
  border-bottom: 1px solid var(--border);
  font-size: 0.98rem;
}

.lang-list li:last-child {
  border-bottom: none;
}

.lang-level {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* ---------- Certifications ---------- */
.cert-list {
  list-style: none;
  max-width: 42rem;
}

.cert-list li {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 1rem;
  padding: 1rem 0;
  border-bottom: 1px solid var(--border);
  font-size: 1.05rem;
  font-weight: 400;
}

.cert-list li:last-child {
  border-bottom: none;
}

.cert-note {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-muted);
}

/* ---------- Contact ---------- */
.contact-lead {
  font-size: 1.15rem;
  font-weight: 300;
  color: var(--text-secondary);
  max-width: 32rem;
  margin-bottom: 0.5rem;
}

.contact-links {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 1.75rem;
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border);
}

.contact-links a {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  text-decoration: none;
  color: var(--text-secondary);
  letter-spacing: 0.03em;
  transition: color 0.2s ease;
}

.contact-links a:hover {
  color: var(--accent);
}

/* ---------- Projects ---------- */
.projects-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
}

.project-card {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
  padding: 2rem;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--surface);
  transition: border-color 0.25s ease, transform 0.25s ease;
}

.project-card:hover {
  border-color: var(--border-strong);
  transform: translateY(-3px);
}

.project-card .item-title {
  margin-bottom: 0;
}

.project-desc {
  font-size: 0.95rem;
  color: var(--text-secondary);
}

.project-link {
  margin-top: auto;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--accent);
  text-decoration: none;
  letter-spacing: 0.02em;
}

.project-link:hover {
  text-decoration: underline;
}

/* ---------- Blog ---------- */
.blog-empty {
  padding: 2rem 0;
}

.blog-empty-title {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  margin-bottom: 0.75rem;
}

.blog-empty-text {
  color: var(--text-secondary);
  max-width: 30rem;
}

.blog-empty-text a {
  color: var(--accent);
  text-decoration: none;
}

.blog-empty-text a:hover {
  text-decoration: underline;
}

/* ---------- Footer ---------- */
footer {
  border-top: 1px solid var(--border);
  padding: 2.5rem 0;
}

footer p {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* ---------- Scroll reveal ---------- */
html.js .reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s var(--ease), transform 0.6s var(--ease);
}

html.js .reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ---------- Focus visibility ---------- */
a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}

/* ---------- Responsive ---------- */
@media (max-width: 768px) {
  .nav-right {
    gap: 0.75rem;
  }

  .nav-toggle {
    display: flex;
  }

  .nav-links {
    display: none;
    position: absolute;
    top: var(--nav-height);
    left: 0;
    right: 0;
    flex-direction: column;
    gap: 0;
    background: var(--bg);
    border-bottom: 1px solid var(--border);
    padding: 0.5rem 2rem 1rem;
  }

  .nav.nav-open .nav-links {
    display: flex;
  }

  .nav-links li {
    padding: 0.85rem 0;
    border-bottom: 1px solid var(--border);
  }

  .nav-links li:last-child {
    border-bottom: none;
  }

  .timeline-item,
  .list-item {
    grid-template-columns: 1fr;
    gap: 0.75rem;
  }

  .timeline-meta {
    flex-direction: row;
    gap: 0.75rem;
    align-items: baseline;
  }

  .skills-grid,
  .home-links-grid {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }

  .section {
    padding: 5rem 0;
  }
}