/* =============================================
   SANTOSH RANA — ML/DS PORTFOLIO CSS
   Aesthetic: Editorial Serif + Monospace Minimal
   ============================================= */

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

:root {
  --ink:       #111010;
  --paper:     #F7F4EF;
  --cream:     #EDE9E0;
  --rust:      #C8572B;
  --rust-pale: #F2E0D8;
  --dark:      #1A1714;
  --mid:       #6B6460;
  --mono:      'DM Mono', monospace;
  --serif:     'DM Serif Display', serif;
  --radius:    4px;
  --trans:     0.25s ease;
}

html { scroll-behavior: smooth; }

body {
  font-family: var(--mono);
  background: var(--paper);
  color: var(--ink);
  font-size: 15px;
  line-height: 1.7;
  overflow-x: hidden;
}

::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--cream); }
::-webkit-scrollbar-thumb { background: var(--rust); border-radius: 3px; }
::selection { background: var(--rust); color: #fff; }

/* ============ NAV ============ */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.2rem 3rem;
  background: rgba(247,244,239,0.88);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(0,0,0,0.07);
}

.nav-logo {
  font-family: var(--serif);
  font-size: 1.4rem;
  color: var(--rust);
  letter-spacing: -0.02em;
}

.nav-links {
  list-style: none;
  display: flex;
  gap: 2.2rem;
  align-items: center;
}

.nav-links a {
  text-decoration: none;
  color: var(--mid);
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  transition: color var(--trans);
}

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

.nav-github {
  border: 1px solid var(--ink) !important;
  padding: 0.3rem 0.85rem;
  border-radius: var(--radius);
  color: var(--ink) !important;
  transition: background var(--trans), color var(--trans) !important;
}
.nav-github:hover { background: var(--ink) !important; color: var(--paper) !important; }

/* ============ HERO ============ */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: 8rem 3rem 4rem;
  overflow: hidden;
  background: var(--dark);
}

.hero-noise {
  position: absolute;
  inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)' opacity='0.08'/%3E%3C/svg%3E");
  background-size: 200px;
  pointer-events: none;
  opacity: 0.5;
}

.hero::after {
  content: '';
  position: absolute;
  bottom: -1px; left: 0; right: 0;
  height: 120px;
  background: var(--paper);
  clip-path: polygon(0 60%, 100% 0, 100% 100%, 0 100%);
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 800px;
  animation: fadeUp 0.9s ease both;
}

.hero-eyebrow {
  font-family: var(--mono);
  font-size: 0.75rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--rust);
  margin-bottom: 1.5rem;
}

.hero-name {
  font-family: var(--serif);
  font-size: clamp(4.5rem, 12vw, 9rem);
  line-height: 0.95;
  color: var(--paper);
  letter-spacing: -0.03em;
  margin-bottom: 1.8rem;
}

.hero-name em {
  font-style: italic;
  color: var(--rust);
}

.hero-tagline {
  font-family: var(--mono);
  font-size: 1rem;
  color: rgba(247,244,239,0.55);
  max-width: 480px;
  margin-bottom: 2.5rem;
  line-height: 1.7;
}

.hero-cta { display: flex; gap: 1rem; flex-wrap: wrap; }

.btn {
  display: inline-block;
  padding: 0.75rem 1.8rem;
  border-radius: var(--radius);
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  text-decoration: none;
  transition: all var(--trans);
  cursor: pointer;
  border: none;
}

.btn-primary { background: var(--rust); color: #fff; }
.btn-primary:hover { background: #b04826; transform: translateY(-2px); }

.btn-ghost {
  background: transparent;
  color: var(--paper);
  border: 1px solid rgba(247,244,239,0.3);
}
.btn-ghost:hover { border-color: var(--paper); background: rgba(247,244,239,0.08); }

.btn-dark { background: var(--dark); color: var(--paper); }
.btn-dark:hover { background: var(--ink); transform: translateY(-2px); }

.hero-scroll-hint {
  position: absolute;
  bottom: 140px;
  right: 3rem;
  z-index: 2;
  writing-mode: vertical-rl;
  font-size: 0.68rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: rgba(247,244,239,0.3);
  animation: fadeUp 1.2s 0.6s ease both;
}

/* ============ SECTIONS ============ */
.section { padding: 7rem 0; }
.section-dark { background: var(--dark); color: var(--paper); }
.section-accent { background: var(--rust-pale); }

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 3rem;
}

.two-col {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 4rem;
  align-items: start;
}

.section-label {
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--mid);
  padding-top: 0.5rem;
}

.section-label.light { color: rgba(247,244,239,0.4); margin-bottom: 0.6rem; }

.section-title {
  font-family: var(--serif);
  font-size: clamp(2.2rem, 4vw, 3.2rem);
  line-height: 1.1;
  letter-spacing: -0.03em;
  margin-bottom: 1.5rem;
}

.section-title.light { color: var(--paper); }
.section-title em { color: var(--rust); font-style: italic; }

/* ============ ABOUT ============ */
.about-body p {
  color: var(--mid);
  margin-bottom: 1.1rem;
  max-width: 580px;
  font-size: 0.92rem;
}

.inline-link {
  display: inline-block;
  margin-top: 0.5rem;
  color: var(--rust);
  text-decoration: none;
  font-size: 0.83rem;
  letter-spacing: 0.03em;
  border-bottom: 1px solid transparent;
  transition: border-color var(--trans);
}
.inline-link:hover { border-color: var(--rust); }

/* ============ PROJECTS ============ */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 2px;
  margin-top: 3rem;
}

.project-card {
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(247,244,239,0.08);
  padding: 2.2rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  transition: background var(--trans), border-color var(--trans);
  position: relative;
  overflow: hidden;
}

.project-card::before {
  content: '';
  position: absolute;
  bottom: 0; left: 0;
  width: 0; height: 2px;
  background: var(--rust);
  transition: width 0.4s ease;
}
.project-card:hover::before { width: 100%; }
.project-card:hover { background: rgba(255,255,255,0.06); border-color: rgba(247,244,239,0.18); }

.project-num {
  font-size: 0.65rem;
  letter-spacing: 0.18em;
  color: var(--rust);
  font-family: var(--mono);
}

.project-title {
  font-family: var(--serif);
  font-size: 1.5rem;
  color: var(--paper);
  letter-spacing: -0.02em;
}

.project-desc {
  font-size: 0.85rem;
  color: rgba(247,244,239,0.55);
  line-height: 1.7;
}

/* Stats row */
.project-highlights {
  display: flex;
  gap: 0;
  border: 1px solid rgba(200,87,43,0.2);
  border-radius: var(--radius);
  overflow: hidden;
}

.highlight-item {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 0.7rem 0.5rem;
  background: rgba(200,87,43,0.07);
  border-right: 1px solid rgba(200,87,43,0.15);
  text-align: center;
}
.highlight-item:last-child { border-right: none; }

.highlight-val {
  font-family: var(--serif);
  font-size: 1.15rem;
  color: var(--rust);
  line-height: 1.1;
}

.highlight-label {
  font-size: 0.58rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: rgba(247,244,239,0.35);
  margin-top: 0.25rem;
}

/* Technical detail blocks */
.project-detail {
  font-size: 0.78rem;
  color: rgba(247,244,239,0.45);
  line-height: 1.65;
  padding: 0.65rem 0.85rem;
  border-left: 2px solid rgba(200,87,43,0.3);
  background: rgba(0,0,0,0.12);
}

.project-detail strong {
  color: rgba(247,244,239,0.75);
  font-weight: 500;
}

.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.project-tags span {
  background: rgba(200,87,43,0.12);
  color: var(--rust);
  padding: 0.2rem 0.65rem;
  border-radius: 2px;
  font-size: 0.68rem;
  letter-spacing: 0.06em;
  border: 1px solid rgba(200,87,43,0.22);
}

.project-links {
  display: flex;
  gap: 1.2rem;
  margin-top: 0.3rem;
}

.project-links a {
  color: rgba(247,244,239,0.45);
  text-decoration: none;
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  transition: color var(--trans);
}
.project-links a:hover { color: var(--rust); }

/* ============ SKILLS ============ */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 3rem;
  margin-top: 3.5rem;
}

.skill-group h4 {
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--rust);
  margin-bottom: 1.2rem;
  padding-bottom: 0.6rem;
  border-bottom: 1px solid var(--cream);
}

.skill-group ul { list-style: none; }

.skill-group li {
  padding: 0.45rem 0;
  font-size: 0.88rem;
  color: var(--mid);
  border-bottom: 1px solid rgba(0,0,0,0.05);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.skill-group li::before {
  content: '—';
  color: var(--rust);
  font-size: 0.7rem;
  flex-shrink: 0;
}

/* ============ CONTACT ============ */
.contact-inner {
  text-align: center;
  max-width: 600px;
  margin: 0 auto;
}

.contact-inner .section-label { margin-bottom: 0.5rem; }
.contact-inner .section-title { margin-bottom: 1rem; }

.contact-sub {
  color: var(--mid);
  font-size: 0.9rem;
  margin-bottom: 2.2rem;
}

.contact-links {
  display: flex;
  justify-content: center;
  gap: 2rem;
  margin-top: 2rem;
}

.contact-links a {
  color: var(--mid);
  text-decoration: none;
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  transition: color var(--trans);
  border-bottom: 1px solid transparent;
}
.contact-links a:hover { color: var(--rust); border-color: var(--rust); }

/* ============ FOOTER ============ */
.footer {
  background: var(--dark);
  color: rgba(247,244,239,0.25);
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.5rem 3rem;
  font-size: 0.7rem;
  letter-spacing: 0.08em;
}

/* ============ ANIMATIONS ============ */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(24px); }
  to   { opacity: 1; transform: translateY(0); }
}

.section { animation: fadeUp 0.7s ease both; }

/* ============ RESPONSIVE ============ */
@media (max-width: 768px) {
  .nav { padding: 1rem 1.5rem; }
  .nav-links { gap: 1.2rem; }
  .nav-links li:not(:last-child):not(:nth-last-child(2)) { display: none; }

  .hero { padding: 7rem 1.5rem 5rem; }
  .hero-scroll-hint { display: none; }

  .container { padding: 0 1.5rem; }
  .two-col { grid-template-columns: 1fr; gap: 1.5rem; }
  .section-label { padding-top: 0; margin-bottom: 0.4rem; }

  .projects-grid { grid-template-columns: 1fr; }
  .skills-grid { grid-template-columns: 1fr 1fr; gap: 2rem; }

  .footer { flex-direction: column; gap: 0.5rem; text-align: center; }
}

@media (max-width: 480px) {
  .skills-grid { grid-template-columns: 1fr; }
  .contact-links { flex-direction: column; gap: 1rem; }
  .project-highlights { flex-direction: column; }
  .highlight-item { border-right: none; border-bottom: 1px solid rgba(200,87,43,0.15); }
  .highlight-item:last-child { border-bottom: none; }
}