/* -------------------------------------------------------------------------
   Amarsh Vutukuri — Portfolio styles
   Extensible design system. All pages inherit from this file.
   ------------------------------------------------------------------------- */

:root {
  /* Color system, aligned with resume */
  --offwhite: #FDFCF8;
  --paper: #F5F2E9;
  --bg: #EEECE6;
  --obsidian: #101010;
  --obsidian-muted: rgba(16, 16, 16, 0.62);
  --obsidian-faint: rgba(16, 16, 16, 0.38);
  --obsidian-rule: rgba(16, 16, 16, 0.12);
  --velvet: #53161D;
  --velvet-light: #9B6068;
  --velvet-bg: rgba(83, 22, 29, 0.04);

  /* Typography */
  --f-sans: 'Google Sans', 'Poppins', -apple-system, sans-serif;
  --f-serif: 'Google Sans', 'Poppins', -apple-system, sans-serif;

  /* Spatial system */
  --gutter: clamp(1.5rem, 4vw, 4rem);
  --page-max: 1280px;
  --measure: 62ch;

  /* Motion */
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
}

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

html {
  scroll-behavior: smooth;
}

body {
  background: var(--bg);
  color: var(--obsidian);
  font-family: var(--f-sans);
  font-weight: 300;
  font-size: 17px;
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  color: inherit;
  text-decoration: none;
  transition: opacity 0.2s var(--ease), color 0.2s var(--ease);
}

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

/* -------------------------------------------------------------------------
   Layout primitives
   ------------------------------------------------------------------------- */

.shell {
  display: grid;
  grid-template-columns: 200px 1fr;
  min-height: 100vh;
  max-width: var(--page-max);
  margin: 0 auto;
  gap: var(--gutter);
  padding: 0 var(--gutter);
}

@media (max-width: 860px) {
  .shell {
    grid-template-columns: 1fr;
    gap: 0;
  }
}

/* -------------------------------------------------------------------------
   Sidebar nav
   ------------------------------------------------------------------------- */

.sidebar {
  position: sticky;
  top: 0;
  height: 100vh;
  padding: 3.5rem 0 2rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  border-right: 1px solid var(--obsidian-rule);
}

.brand {
  display: block;
  padding-right: var(--gutter);
}

.brand-name {
  font-family: var(--f-sans);
  font-size: 1.05rem;
  font-weight: 500;
  color: var(--obsidian);
  letter-spacing: -0.02em;
  line-height: 1.15;
  margin-bottom: 0.3rem;
}

.brand-name .first {
  color: var(--velvet);
}

.brand-tagline {
  font-family: var(--f-serif);
  font-style: normal;
  font-size: 0.95rem;
  color: var(--obsidian-muted);
  line-height: 1.35;
}

.sidebar-nav {
  margin-top: 2.5rem;
  padding-right: var(--gutter);
}

.sidebar-nav ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.sidebar-nav a {
  display: inline-block;
  font-family: var(--f-sans);
  font-size: 0.82rem;
  font-weight: 400;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--obsidian-muted);
  padding: 0.2rem 0;
  position: relative;
}

.sidebar-nav a:hover,
.sidebar-nav a.current {
  color: var(--velvet);
}

.sidebar-nav a.current::before {
  content: '';
  position: absolute;
  left: -1.1rem;
  top: 50%;
  width: 0.5rem;
  height: 1px;
  background: var(--velvet);
  transform: translateY(-50%);
}

.sidebar-foot {
  padding-right: var(--gutter);
  font-size: 0.75rem;
  color: var(--obsidian-faint);
  line-height: 1.5;
  letter-spacing: 0.02em;
}

.sidebar-foot a {
  color: var(--obsidian-muted);
  border-bottom: 1px solid var(--obsidian-rule);
  padding-bottom: 1px;
}

.sidebar-foot a:hover {
  color: var(--velvet);
  border-color: var(--velvet);
}

@media (max-width: 860px) {
  .sidebar {
    position: sticky;
    top: 0;
    z-index: 10;
    height: auto;
    display: block;
    background: var(--bg);
    border-right: none;
    border-bottom: 1px solid var(--obsidian-rule);
    padding: 1.5rem var(--gutter) 0.75rem;
    margin: 0 calc(var(--gutter) * -1);
  }

  .brand {
    padding-right: 0;
    margin-bottom: 1rem;
  }

  .sidebar-nav {
    margin-top: 0;
    padding-right: 0;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
  }

  .sidebar-nav::-webkit-scrollbar {
    display: none;
  }

  .sidebar-nav ul {
    flex-direction: row;
    gap: 1.5rem;
    white-space: nowrap;
    padding-bottom: 0.15rem;
  }

  .sidebar-nav a.current::before {
    left: 0;
    right: 0;
    top: auto;
    bottom: -0.35rem;
    width: auto;
    height: 1px;
    transform: none;
  }

  .sidebar-foot {
    display: none;
  }
}

/* -------------------------------------------------------------------------
   Main content
   ------------------------------------------------------------------------- */

.content {
  padding: 3.5rem 0 6rem;
  min-width: 0; /* prevent grid blowout */
}

@media (max-width: 860px) {
  .content {
    padding: 2.5rem 0 4rem;
  }
}

/* -------------------------------------------------------------------------
   Typography
   ------------------------------------------------------------------------- */

.eyebrow {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--velvet);
  margin-bottom: 1.2rem;
}

.eyebrow--faint {
  color: var(--obsidian-faint);
}

h1, h2, h3, h4 {
  font-weight: 400;
  letter-spacing: -0.02em;
  color: var(--obsidian);
}

.display {
  font-family: var(--f-sans);
  font-size: clamp(2.4rem, 6vw, 4.8rem);
  font-weight: 300;
  line-height: 1.02;
  letter-spacing: -0.035em;
  color: var(--obsidian);
}

.display em {
  font-family: var(--f-serif);
  font-style: normal;
  font-weight: 400;
  color: var(--velvet);
}

h2.section-head {
  font-family: var(--f-sans);
  font-size: clamp(1.8rem, 3.5vw, 2.6rem);
  font-weight: 300;
  line-height: 1.1;
  letter-spacing: -0.025em;
  margin-bottom: 2rem;
}

h2.section-head em {
  font-family: var(--f-serif);
  font-style: normal;
  color: var(--velvet);
  font-weight: 400;
}

.lede {
  font-family: var(--f-serif);
  font-style: normal;
  font-weight: 400;
  font-size: clamp(1.15rem, 1.6vw, 1.35rem);
  line-height: 1.5;
  color: var(--obsidian-muted);
  max-width: var(--measure);
  margin-top: 1.5rem;
}

p {
  max-width: var(--measure);
  margin-bottom: 1rem;
  color: var(--obsidian);
}

p.muted {
  color: var(--obsidian-muted);
}

strong {
  font-weight: 500;
  color: var(--velvet);
}

/* -------------------------------------------------------------------------
   Sections
   ------------------------------------------------------------------------- */

section {
  padding: 4rem 0;
  border-top: 1px solid var(--obsidian-rule);
  scroll-margin-top: -0.5rem;
}

@media (max-width: 860px) {
  section {
    scroll-margin-top: 7rem;
  }
}

section:first-of-type {
  border-top: none;
  padding-top: 0;
}

section.hero {
  padding: 0 0 5rem;
  border-top: none;
}

section.hero .display {
  margin-top: -0.12em;
}

.section-meta {
  display: flex;
  align-items: baseline;
  gap: 1.2rem;
  margin-bottom: 2.5rem;
  padding-bottom: 1rem;
}

.section-meta .count {
  font-family: var(--f-serif);
  font-style: normal;
  color: var(--obsidian-faint);
  font-size: 1rem;
}

/* -------------------------------------------------------------------------
   Hero / opening
   ------------------------------------------------------------------------- */

.hero-body {
  margin-top: 2.5rem;
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  max-width: 780px;
}

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem 2rem;
  font-size: 0.85rem;
  color: var(--obsidian-muted);
  margin-top: 1rem;
}

.hero-meta .item {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

.hero-meta .label {
  font-size: 0.7rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--obsidian-faint);
}

.hero-meta .value {
  color: var(--obsidian);
  font-weight: 400;
}

/* -------------------------------------------------------------------------
   Work cards (case studies)
   ------------------------------------------------------------------------- */

.work-list {
  display: flex;
  flex-direction: column;
}

.work-item {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 2rem;
  padding: 2rem 0;
  border-bottom: 1px solid var(--obsidian-rule);
  align-items: baseline;
  transition: padding 0.3s var(--ease);
}

.work-item:first-child {
  padding-top: 0;
}

.work-item:last-child {
  border-bottom: none;
}

.work-item:hover {
  padding-left: 0.6rem;
}

.work-title {
  font-family: var(--f-sans);
  font-size: clamp(1.4rem, 2.2vw, 1.8rem);
  font-weight: 400;
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin-bottom: 0.6rem;
  transition: color 0.2s var(--ease);
}

.work-item:hover .work-title {
  color: var(--velvet);
}

.work-title em {
  font-family: var(--f-serif);
  font-style: normal;
  color: var(--velvet);
  font-weight: 400;
}

.work-desc {
  font-size: 0.95rem;
  color: var(--obsidian-muted);
  max-width: 55ch;
  line-height: 1.55;
  margin-bottom: 0.8rem;
}

.work-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 1.2rem;
  font-size: 0.82rem;
  color: var(--obsidian-muted);
  font-family: var(--f-serif);
  font-style: normal;
}

.work-stats .stat strong {
  font-family: var(--f-sans);
  font-style: normal;
  font-weight: 500;
  color: var(--velvet);
  margin-right: 0.35rem;
}

.work-meta {
  text-align: right;
  font-size: 0.78rem;
  color: var(--obsidian-faint);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  min-width: 120px;
}

.work-meta .year {
  color: var(--obsidian-muted);
  font-weight: 400;
}

.work-meta .read {
  font-family: var(--f-serif);
  font-style: normal;
  font-size: 0.85rem;
  text-transform: none;
  letter-spacing: 0;
  color: var(--velvet);
}

@media (max-width: 640px) {
  .work-item {
    grid-template-columns: 1fr;
    gap: 0.8rem;
  }
  .work-meta {
    text-align: left;
    flex-direction: row;
    gap: 1rem;
  }
}

/* -------------------------------------------------------------------------
   Essays list
   ------------------------------------------------------------------------- */

.essay-list {
  display: flex;
  flex-direction: column;
}

.essay-item {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 1.5rem;
  padding: 1.5rem 0;
  border-bottom: 1px solid var(--obsidian-rule);
  align-items: baseline;
  transition: padding 0.3s var(--ease);
}

.essay-item:first-child {
  padding-top: 0;
}

.essay-item:last-child {
  border-bottom: none;
}

.essay-item:hover {
  padding-left: 0.6rem;
}

.essay-title {
  font-family: var(--f-sans);
  font-size: 1.15rem;
  font-weight: 400;
  line-height: 1.3;
  letter-spacing: -0.015em;
  color: var(--obsidian);
  transition: color 0.2s var(--ease);
  margin-bottom: 0.3rem;
}

.essay-item:hover .essay-title {
  color: var(--velvet);
}

.essay-desc {
  font-family: var(--f-serif);
  font-style: normal;
  font-size: 0.95rem;
  color: var(--obsidian-muted);
  line-height: 1.45;
  max-width: 58ch;
}

.essay-meta {
  text-align: right;
  font-size: 0.78rem;
  color: var(--obsidian-faint);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  white-space: nowrap;
  min-width: 80px;
}

/* -------------------------------------------------------------------------
   Labs
   ------------------------------------------------------------------------- */

.labs-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.5rem;
  margin-top: 1rem;
}

.lab-card {
  padding: 1.75rem;
  background: var(--paper);
  border: 1px solid var(--obsidian-rule);
  transition: border-color 0.2s var(--ease), transform 0.3s var(--ease);
}

.lab-card:hover {
  border-color: var(--velvet-light);
  transform: translateY(-3px);
}

.lab-name {
  font-family: var(--f-sans);
  font-size: 1.15rem;
  font-weight: 500;
  color: var(--obsidian);
  margin-bottom: 0.3rem;
  letter-spacing: -0.01em;
}

.lab-status {
  font-family: var(--f-serif);
  font-style: normal;
  font-size: 0.8rem;
  color: var(--velvet);
  margin-bottom: 1rem;
}

.lab-desc {
  font-size: 0.9rem;
  color: var(--obsidian-muted);
  line-height: 1.55;
}

/* -------------------------------------------------------------------------
   About block
   ------------------------------------------------------------------------- */

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: start;
}

@media (max-width: 700px) {
  .about-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
}

.about-col p {
  margin-bottom: 1rem;
  max-width: none;
}

.about-col p:last-child {
  margin-bottom: 0;
}

.about-col .pull {
  font-family: var(--f-serif);
  font-style: normal;
  font-size: 1.2rem;
  color: var(--velvet);
  line-height: 1.45;
}

/* -------------------------------------------------------------------------
   Contact
   ------------------------------------------------------------------------- */

.contact-block {
  padding-top: 2rem;
}

.contact-links {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem 3rem;
  margin-top: 2rem;
  font-family: var(--f-sans);
}

.contact-links .item {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}

.contact-links .label {
  font-size: 0.7rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--obsidian-faint);
}

.contact-links a {
  font-size: 1.05rem;
  color: var(--obsidian);
  border-bottom: 1px solid var(--obsidian-rule);
  padding-bottom: 2px;
  transition: border-color 0.2s var(--ease), color 0.2s var(--ease);
}

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

/* -------------------------------------------------------------------------
   Case study / essay inner page
   ------------------------------------------------------------------------- */

.article-head {
  padding: 1rem 0 3rem;
  border-bottom: 1px solid var(--obsidian-rule);
  margin-bottom: 3rem;
}

.article-head .back {
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--obsidian-muted);
  margin-bottom: 2rem;
  display: inline-block;
}

.article-head .back:hover {
  color: var(--velvet);
}

.article-head h1 {
  font-size: clamp(2.2rem, 4.5vw, 3.4rem);
  font-weight: 300;
  letter-spacing: -0.03em;
  line-height: 1.05;
  max-width: 18ch;
  margin-bottom: 1.5rem;
}

.article-head h1 em {
  font-family: var(--f-serif);
  font-style: normal;
  color: var(--velvet);
  font-weight: 400;
}

.article-head .meta {
  display: flex;
  flex-wrap: wrap;
  gap: 1.2rem 2rem;
  font-size: 0.8rem;
  color: var(--obsidian-faint);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.article-head .meta span {
  display: inline-block;
}

.article-body {
  max-width: var(--measure);
  font-size: 1.05rem;
  line-height: 1.75;
}

.article-body h2 {
  font-size: 1.5rem;
  font-weight: 400;
  color: var(--obsidian);
  letter-spacing: -0.02em;
  margin: 3rem 0 1.2rem;
}

.article-body h2 em {
  font-family: var(--f-serif);
  font-style: normal;
  color: var(--velvet);
  font-weight: 400;
}

.article-body h3 {
  font-size: 1.1rem;
  font-weight: 500;
  color: var(--velvet);
  margin: 2.2rem 0 0.8rem;
  letter-spacing: -0.01em;
}

.article-body p {
  margin-bottom: 1.1rem;
  max-width: none;
}

.article-body blockquote {
  font-family: var(--f-serif);
  font-style: normal;
  font-size: 1.3rem;
  line-height: 1.45;
  color: var(--velvet);
  border-left: 2px solid var(--velvet-light);
  padding-left: 1.5rem;
  margin: 2rem 0;
  max-width: 52ch;
}

.article-body ul,
.article-body ol {
  padding-left: 1.2rem;
  margin-bottom: 1.1rem;
}

.article-body li {
  margin-bottom: 0.5rem;
  padding-left: 0.3rem;
}

.article-body li::marker {
  color: var(--velvet);
}

.article-body .callout {
  background: var(--velvet-bg);
  border-left: 2px solid var(--velvet);
  padding: 1.1rem 1.4rem;
  margin: 2rem 0;
  font-family: var(--f-serif);
  font-style: normal;
  color: var(--obsidian);
  font-size: 0.98rem;
  line-height: 1.55;
}

.article-body .stats-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 1.5rem 2.5rem;
  margin: 2rem 0;
  padding: 1.5rem 0;
  border-top: 1px solid var(--obsidian-rule);
  border-bottom: 1px solid var(--obsidian-rule);
}

.article-body .stats-row .stat {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}

.article-body .stats-row .stat .num {
  font-family: var(--f-sans);
  font-size: 1.6rem;
  font-weight: 400;
  color: var(--velvet);
  letter-spacing: -0.02em;
}

.article-body .stats-row .stat .label {
  font-family: var(--f-sans);
  font-size: 0.75rem;
  color: var(--obsidian-muted);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.article-foot {
  padding-top: 3rem;
  margin-top: 4rem;
  border-top: 1px solid var(--obsidian-rule);
  font-family: var(--f-serif);
  font-style: normal;
  color: var(--obsidian-muted);
  font-size: 1rem;
  max-width: var(--measure);
}

.article-foot a {
  color: var(--velvet);
  border-bottom: 1px solid var(--velvet-light);
}

/* -------------------------------------------------------------------------
   Motion
   ------------------------------------------------------------------------- */

@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(18px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.rise {
  animation: rise 0.8s var(--ease) both;
}

.rise-delay-1 { animation-delay: 0.08s; }
.rise-delay-2 { animation-delay: 0.16s; }
.rise-delay-3 { animation-delay: 0.24s; }
.rise-delay-4 { animation-delay: 0.32s; }
.rise-delay-5 { animation-delay: 0.40s; }

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

/* -------------------------------------------------------------------------
   Print
   ------------------------------------------------------------------------- */

@media print {
  .sidebar, .sidebar-nav { display: none; }
  .shell { grid-template-columns: 1fr; }
  body { background: white; }
}