/* ============================================
   PORTFOLIO THEME — Professional & Corporate
   ============================================ */

/* --- Reset & Base --- */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

:root {
  --color-primary: #1a365d;
  --color-primary-light: #2b4c7e;
  --color-accent: #3182ce;
  --color-accent-light: #63b3ed;
  --color-text: #1a202c;
  --color-text-light: #4a5568;
  --color-text-muted: #718096;
  --color-bg: #ffffff;
  --color-bg-alt: #f7fafc;
  --color-bg-card: #ffffff;
  --color-border: #e2e8f0;
  --color-gradient-start: #1a365d;
  --color-gradient-mid: #2b4c7e;
  --color-gradient-end: #2c5282;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
  --max-width: 1100px;
  --nav-height: 72px;
}

html { scroll-behavior: smooth; font-size: 16px; }

body {
  font-family: var(--font-sans);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--color-accent); text-decoration: none; transition: color 0.2s; }
a:hover { color: var(--color-primary); }

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

/* --- Navigation --- */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border);
  transition: box-shadow 0.3s;
}
.nav--scrolled { box-shadow: 0 2px 20px rgba(0,0,0,0.08); }
.nav__container {
  max-width: var(--max-width); margin: 0 auto; padding: 0 2rem;
  display: flex; align-items: center; justify-content: space-between;
  height: var(--nav-height);
}
.nav__logo {
  font-size: 1.25rem; font-weight: 700; color: var(--color-primary);
  letter-spacing: -0.02em;
}
.nav__logo:hover { color: var(--color-accent); }
.nav__menu { display: flex; gap: 2rem; }
.nav__link {
  font-size: 0.875rem; font-weight: 500; color: var(--color-text-light);
  transition: color 0.2s; letter-spacing: 0.01em;
}
.nav__link:hover { color: var(--color-primary); }
.nav__toggle { display: none; background: none; border: none; cursor: pointer; padding: 0.5rem; }
.nav__toggle span {
  display: block; width: 24px; height: 2px; background: var(--color-text);
  margin: 5px 0; transition: 0.3s;
}

/* --- Buttons --- */
.btn {
  display: inline-block; padding: 0.875rem 2rem; border-radius: 6px;
  font-weight: 600; font-size: 0.9rem; transition: all 0.25s;
  letter-spacing: 0.01em; cursor: pointer; border: 2px solid transparent;
}
.btn--primary {
  background: var(--color-accent); color: #fff; border-color: var(--color-accent);
}
.btn--primary:hover {
  background: var(--color-primary); border-color: var(--color-primary); color: #fff;
  transform: translateY(-1px); box-shadow: 0 4px 12px rgba(49,130,206,0.3);
}
.btn--outline {
  background: transparent; color: #fff; border-color: rgba(255,255,255,0.6);
}
.btn--outline:hover {
  background: #fff; color: var(--color-primary); border-color: #fff;
  transform: translateY(-1px);
}

/* --- Hero Section (Combined with About) --- */
.hero {
  position: relative; min-height: 100vh; display: flex; align-items: center;
  justify-content: center; overflow: hidden;
}
.hero__bg {
  position: absolute; inset: 0;
  background: linear-gradient(135deg, var(--color-gradient-start) 0%, var(--color-gradient-mid) 40%, var(--color-gradient-end) 100%);
}
.hero__bg::before {
  content: ''; position: absolute; inset: 0;
  background: radial-gradient(circle at 20% 50%, rgba(99,179,237,0.15) 0%, transparent 50%),
              radial-gradient(circle at 80% 20%, rgba(99,179,237,0.1) 0%, transparent 50%),
              radial-gradient(circle at 60% 80%, rgba(49,130,206,0.1) 0%, transparent 50%);
}
.hero__bg::after {
  content: ''; position: absolute; inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.03'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}
.hero__split {
  position: relative; z-index: 1; max-width: var(--max-width); margin: 0 auto;
  padding: calc(var(--nav-height) + 3rem) 2rem 4rem;
  display: grid; grid-template-columns: 1.4fr 1fr; gap: 4rem; align-items: center;
}
.hero__left { }
.hero__greeting {
  font-size: 1rem; color: var(--color-accent-light); font-weight: 500;
  margin-bottom: 0.5rem; letter-spacing: 0.05em; text-transform: uppercase;
}
.hero__name {
  font-size: clamp(2.2rem, 5vw, 3.2rem); font-weight: 700; color: #fff;
  line-height: 1.1; margin-bottom: 0.75rem; letter-spacing: -0.03em;
}
.hero__tagline {
  font-size: clamp(1rem, 2vw, 1.2rem); color: rgba(255,255,255,0.9);
  font-weight: 500; margin-bottom: 1.5rem;
}
.hero__bio {
  font-size: 0.92rem; color: rgba(255,255,255,0.72); line-height: 1.75;
  margin-bottom: 2rem;
}
.hero__bio p { margin-bottom: 0.75rem; }
.hero__cta { display: flex; gap: 1rem; flex-wrap: wrap; }
.hero__right { display: flex; flex-direction: column; align-items: center; gap: 2rem; }
.hero__photo { width: 220px; height: 220px; border-radius: 50%; overflow: hidden;
  border: 4px solid rgba(255,255,255,0.2); box-shadow: 0 8px 40px rgba(0,0,0,0.3);
}
.hero__photo-img { width: 100%; height: 100%; object-fit: cover; }
.hero__photo-placeholder {
  width: 100%; height: 100%; display: flex; align-items: center; justify-content: center;
  background: linear-gradient(135deg, var(--color-accent), var(--color-primary-light));
  font-size: 4rem; font-weight: 700; color: rgba(255,255,255,0.8);
}
.hero__highlights {
  display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; width: 100%;
}
.hero__highlight {
  display: flex; flex-direction: column; align-items: center; padding: 1rem;
  background: rgba(255,255,255,0.08); border-radius: 10px;
  border: 1px solid rgba(255,255,255,0.12); backdrop-filter: blur(4px);
}
.hero__highlight-number {
  font-size: 1.5rem; font-weight: 700; color: var(--color-accent-light);
  line-height: 1; font-family: var(--font-mono);
}
.hero__highlight-label {
  font-size: 0.72rem; color: rgba(255,255,255,0.55); margin-top: 0.25rem; text-align: center;
}
.hero__domains {
  display: flex; flex-wrap: wrap; justify-content: center; gap: 0.5rem; width: 100%;
}
.hero__domain-pill {
  padding: 0.3rem 0.85rem; border-radius: 20px; font-size: 0.75rem; font-weight: 500;
  color: rgba(255,255,255,0.85); background: rgba(255,255,255,0.1);
  border: 1px solid rgba(255,255,255,0.18); letter-spacing: 0.02em;
}
.hero__scroll {
  display: none;
}

/* --- Section Base --- */
.section { padding: 6rem 0; }
.section:nth-child(even) { background: var(--color-bg-alt); }
.section__title {
  font-size: 2rem; font-weight: 700; color: var(--color-primary);
  margin-bottom: 0.75rem; letter-spacing: -0.02em;
}
.section__subtitle {
  font-size: 1.05rem; color: var(--color-text-muted); margin-bottom: 3rem;
  max-width: 600px;
}

/* --- Domain Cards --- */
.domains__grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 1.5rem; }
.domain-card {
  padding: 2rem; background: var(--color-bg-card); border-radius: 10px;
  border: 1px solid var(--color-border); transition: all 0.3s;
}
.domain-card:hover {
  transform: translateY(-4px); box-shadow: 0 8px 30px rgba(0,0,0,0.08);
  border-color: var(--color-accent);
}
.domain-card__icon { font-size: 2rem; margin-bottom: 1rem; }
.domain-card__title { font-size: 1.15rem; font-weight: 600; color: var(--color-primary); margin-bottom: 0.5rem; }
.domain-card__description { font-size: 0.9rem; color: var(--color-text-muted); line-height: 1.6; }

/* --- Project Lanes --- */
.projects__lanes {
  display: grid; grid-template-columns: 1fr 1fr; gap: 2.5rem;
}
.projects__lane { }
.projects__lane-title {
  font-size: 1.05rem; font-weight: 600; color: var(--color-primary);
  margin-bottom: 1.5rem; padding-bottom: 0.75rem;
  border-bottom: 2px solid var(--color-accent);
  display: flex; align-items: center; gap: 0.5rem;
}
.projects__lane-icon { font-size: 1.2rem; }
.projects__lane-cards { display: flex; flex-direction: column; gap: 1.25rem; }

/* --- Project Cards --- */
.project-card {
  padding: 2rem; background: var(--color-bg-card); border-radius: 10px;
  border: 1px solid var(--color-border); transition: all 0.3s;
  display: flex; flex-direction: column;
}
.project-card:hover {
  transform: translateY(-4px); box-shadow: 0 8px 30px rgba(0,0,0,0.08);
}
.project-card__header { margin-bottom: 1rem; }
.project-card__title { font-size: 1.2rem; font-weight: 600; color: var(--color-primary); }
.project-card__role {
  font-size: 0.8rem; color: var(--color-accent); font-weight: 500;
  text-transform: uppercase; letter-spacing: 0.05em;
}
.project-card__description { font-size: 0.9rem; color: var(--color-text-light); margin-bottom: 1rem; flex-grow: 1; }
.project-card__tech { display: flex; flex-wrap: wrap; gap: 0.5rem; margin-bottom: 1rem; }
.tag {
  padding: 0.25rem 0.75rem; background: var(--color-bg-alt); border-radius: 20px;
  font-size: 0.75rem; font-weight: 500; color: var(--color-text-muted);
  font-family: var(--font-mono);
}
.project-card__impact { font-size: 0.85rem; color: var(--color-text-light); margin-bottom: 0.75rem; }
.project-card__link { font-size: 0.9rem; font-weight: 600; }

/* --- Timeline --- */
.timeline { position: relative; padding-left: 7rem; }
.timeline::before {
  content: ''; position: absolute; left: 5.5rem; top: 0; bottom: 0;
  width: 2px; background: var(--color-border);
}
.timeline__item { position: relative; padding-bottom: 3rem; }
.timeline__item:last-child { padding-bottom: 0; }
.timeline__marker {
  position: absolute; left: -1.5rem; top: 0.35rem;
  width: 12px; height: 12px; border-radius: 50%;
  background: var(--color-accent); border: 3px solid var(--color-bg);
  box-shadow: 0 0 0 2px var(--color-accent);
  transform: translateX(-5px);
}
.timeline__content { padding-left: 1rem; }
.timeline__header { margin-bottom: 0.75rem; }
.timeline__title { font-size: 1.15rem; font-weight: 600; color: var(--color-primary); }
.timeline__company { font-size: 0.95rem; color: var(--color-accent); font-weight: 500; display: block; }
.timeline__period {
  position: absolute; left: -7rem; top: 0.2rem; width: 5rem; text-align: right;
  font-size: 0.75rem; color: var(--color-text-muted); font-family: var(--font-mono);
  line-height: 1.3;
}
.timeline__description { font-size: 0.9rem; color: var(--color-text-light); margin-bottom: 0.75rem; }
.timeline__highlights { list-style: none; padding: 0; }
.timeline__highlights li {
  font-size: 0.875rem; color: var(--color-text-light); padding-left: 1.25rem;
  position: relative; margin-bottom: 0.35rem;
}
.timeline__highlights li::before {
  content: '→'; position: absolute; left: 0; color: var(--color-accent); font-weight: 600;
}
.timeline__team {
  display: inline-block; margin-top: 0.5rem; padding: 0.25rem 0.75rem;
  background: var(--color-bg-alt); border-radius: 20px;
  font-size: 0.75rem; font-weight: 500; color: var(--color-text-muted);
}

/* --- Skills --- */
.skills__grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 2rem; }
.skill-group { }
.skill-group__title {
  font-size: 0.85rem; font-weight: 600; color: var(--color-text-muted);
  text-transform: uppercase; letter-spacing: 0.08em; margin-bottom: 1rem;
  padding-bottom: 0.5rem; border-bottom: 2px solid var(--color-border);
}
.skill-group__items { display: flex; flex-wrap: wrap; gap: 0.5rem; }
.skill-tag {
  padding: 0.4rem 1rem; background: var(--color-bg-card); border: 1px solid var(--color-border);
  border-radius: 6px; font-size: 0.85rem; color: var(--color-text-light);
  font-weight: 500; transition: all 0.2s;
}
.skill-tag:hover {
  border-color: var(--color-accent); color: var(--color-accent);
  background: rgba(49,130,206,0.05);
}

/* --- Education --- */
.education__degrees {
  display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 2rem;
}
.education__card {
  background: rgba(255,255,255,0.05); border: 1px solid var(--color-border);
  border-radius: 12px; padding: 1.5rem;
}
.education__degree {
  font-size: 1.1rem; font-weight: 700; color: var(--color-text); margin: 0 0 0.25rem;
}
.education__school {
  font-size: 0.95rem; color: var(--color-accent); font-weight: 600;
}
.education__period {
  font-size: 0.85rem; color: var(--color-text-light); margin-left: 0.75rem;
}
.education__description {
  font-size: 0.9rem; color: var(--color-text-secondary); margin-top: 0.5rem; line-height: 1.5;
}

/* --- Contact --- */
.contact { text-align: center; }
.contact__links {
  display: flex; justify-content: center; gap: 2rem; flex-wrap: wrap; margin-bottom: 2.5rem;
}
.contact__item {
  display: flex; flex-direction: column; align-items: center; padding: 2rem;
  background: var(--color-bg-card); border: 1px solid var(--color-border);
  border-radius: 10px; min-width: 200px; transition: all 0.3s; color: var(--color-text);
}
.contact__item:hover {
  transform: translateY(-4px); box-shadow: 0 8px 30px rgba(0,0,0,0.08);
  border-color: var(--color-accent); color: var(--color-text);
}
.contact__icon { font-size: 1.5rem; margin-bottom: 0.5rem; }
.contact__label { font-size: 0.8rem; color: var(--color-text-muted); text-transform: uppercase; letter-spacing: 0.05em; }
.contact__value { font-size: 0.9rem; font-weight: 500; color: var(--color-primary); margin-top: 0.25rem; }
.contact__resume { margin-top: 1rem; }

/* --- Footer --- */
.footer { padding: 2rem 0; border-top: 1px solid var(--color-border); background: var(--color-bg-alt); }
.footer__content {
  display: flex; justify-content: space-between; align-items: center; max-width: var(--max-width);
  margin: 0 auto; padding: 0 2rem;
}
.footer__content p { font-size: 0.85rem; color: var(--color-text-muted); }
.footer__links { display: flex; gap: 1.5rem; }
.footer__links a { font-size: 0.85rem; color: var(--color-text-muted); }
.footer__links a:hover { color: var(--color-accent); }

/* --- Responsive --- */
@media (max-width: 768px) {
  .nav__menu { display: none; position: absolute; top: var(--nav-height); left: 0; right: 0;
    background: #fff; flex-direction: column; padding: 1.5rem 2rem; gap: 1rem;
    border-bottom: 1px solid var(--color-border); box-shadow: 0 10px 30px rgba(0,0,0,0.1);
  }
  .nav__menu--open { display: flex; }
  .nav__toggle { display: block; }
  .hero__split { grid-template-columns: 1fr; gap: 2rem; text-align: center; padding-top: calc(var(--nav-height) + 2rem); }
  .hero__name { font-size: 2.2rem; }
  .hero__cta { justify-content: center; }
  .hero__right { order: -1; }
  .hero__photo { width: 160px; height: 160px; }
  .hero__highlights { grid-template-columns: 1fr 1fr; }
  .projects__lanes { grid-template-columns: 1fr; }
  .projects__grid { grid-template-columns: 1fr; }
  .timeline { padding-left: 2rem; }
  .timeline::before { left: 0; }
  .timeline__marker { left: -2rem; }
  .timeline__period {
    position: static; width: auto; text-align: left; margin-bottom: 0.25rem;
  }
  .education__degrees { grid-template-columns: 1fr; gap: 1.5rem; }
  .contact__links { flex-direction: column; align-items: center; }
  .footer__content { flex-direction: column; gap: 1rem; text-align: center; }
  .section { padding: 4rem 0; }
}