/* =====================================================
   Dr. Deena Nath Gupta — Academic Portfolio
   Minimalist Clean-Tech Aesthetic
   ===================================================== */
/* ─── Design System ─────────────────────────────────── */
    :root {
      --color-primary: #0d47a1;
      --color-primary-dark: #0a3a82;
      --color-primary-light: #1565c0;
      --color-accent: #00897b;
      --color-accent-light: #26a69a;
      --color-text-primary: #1a1a2e;
      --color-text-secondary: #4a5568;
      --color-text-muted: #718096;
      --color-bg: #f7fafc;
      --color-surface: #ffffff;
      --color-border: #e2e8f0;
      --color-success: #2e7d32;
      --color-success-bg: #e8f5e9;
      --color-warning: #e65100;
      --color-warning-bg: #fff3e0;
      --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
      --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
      --shadow-lg: 0 8px 24px rgba(0,0,0,0.1);
      --radius-sm: 6px;
      --radius-md: 10px;
      --radius-lg: 16px;
      --font-sans: 'Source Sans 3', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
      --font-size-xs: 0.72rem;
      --font-size-sm: 0.86rem;
      --font-size-base: 1rem;
      --font-size-lg: 1.08rem;
      --font-size-xl: 1.3rem;
      --font-size-2xl: 1.6rem;
      --font-size-3xl: 2rem;
      --font-size-4xl: 2.6rem;
      --line-height-tight: 1.3;
      --line-height-normal: 1.7;
      --line-height-relaxed: 1.8;
      --ease-standard: cubic-bezier(0.22, 1, 0.36, 1);
      --ease-soft: cubic-bezier(0.25, 0.46, 0.45, 0.94);
      --dur-fast: 220ms;
      --dur-base: 420ms;
      --dur-slow: 700ms;

      /* Backward-compatible aliases used by existing stylesheet */
      --ink:        var(--color-text-primary);
      --ink-muted:  var(--color-text-secondary);
      --ink-faint:  var(--color-text-muted);
      --canvas:     var(--color-bg);
      --surface:    var(--color-surface);
      --navy:       var(--color-primary);
      --navy-light: var(--color-primary-light);
      --gold:       #0f6882;
      --gold-light: #2d8aa8;
      --rule:       var(--color-border);
      --rule-dark:  #c4d0dc;
      --radius:     var(--radius-sm);
      --shadow:     var(--shadow-md);
      --font-serif: 'Lora', Georgia, serif;
      --max-w:      1100px;
    }

    /* ─── Reset ─────────────────────────────────────────── */
    *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
    html { font-size: 16px; scroll-behavior: smooth; }
    body {
      font-family: var(--font-sans);
      background: var(--canvas);
      color: var(--ink);
      font-size: var(--font-size-base);
      line-height: var(--line-height-normal);
      -webkit-font-smoothing: antialiased;
      text-rendering: optimizeLegibility;
    }
    a { color: var(--navy); text-decoration: none; transition: color 0.2s; }
    a:hover { color: var(--gold); }
    img { display: block; max-width: 100%; }

    /* ─── Layout Helpers ─────────────────────────────────── */
    .wrap { max-width: var(--max-w); margin: 0 auto; padding: 0 2rem; }
    .section {
      padding: 5rem 0;
      background: var(--color-surface);
      position: relative;
      isolation: isolate;
    }
    .section + .section {
      border-top: 1px solid #d7e1ec;
      box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.7);
    }
    .section--alt {
      background: #eef3f9;
    }

    /* Two-tone professional theme (on/off alternation) */
    #about,
    #publications,
    #honors {
      background: #dcdcdc47;
    }
    #impact,
    #service,
    #contact {
      background: #aac8e863;
    }

    /* ─── Section Label & Title ──────────────────────────── */
    .eyebrow {
      font-family: var(--font-sans);
      font-size: 0.72rem;
      font-weight: 700;
      letter-spacing: 0.18em;
      text-transform: uppercase;
      color: var(--gold);
      margin-bottom: 0.6rem;
    }
    .section-title {
      font-family: var(--font-serif);
      font-size: 2rem;
      font-weight: 600;
      color: var(--ink);
      letter-spacing: -0.02em;
      margin-bottom: 2.5rem;
      line-height: 1.2;
    }
    .section-title span { color: var(--navy); }

    .section-subtitle {
      font-family: var(--font-serif);
      font-size: 1.3rem;
      font-weight: 600;
      color: var(--ink);
      margin: 3rem 0 1.5rem;
      line-height: 1.25;
    }

    .summary-text {
      font-size: 0.98rem;
      color: var(--ink-muted);
      line-height: var(--line-height-relaxed);
      text-align: justify;
      text-justify: inter-word;
    }
    .summary-text + .summary-text { margin-top: 1.2rem; }
    .summary-strong { color: var(--ink); }

    .sub-section {
      margin-top: 3rem;
      padding-top: 2.1rem;
      border-top: 1px solid var(--rule);
    }

    /* ─── Nav ────────────────────────────────────────────── */
    .nav {
      position: sticky; top: 0; z-index: 200;
      background: rgba(247,250,252,0.96);
      backdrop-filter: blur(14px);
      border-bottom: 1px solid var(--rule);
      transition: box-shadow 0.25s;
    }
    .nav.shadow { box-shadow: 0 2px 20px rgba(0,0,0,0.08); }
    .nav-inner {
      max-width: var(--max-w); margin: 0 auto; padding: 0 2rem;
      height: 60px; display: flex; align-items: center; justify-content: space-between;
    }
    .nav-brand {
      font-family: var(--font-serif);
      font-size: 1rem;
      font-weight: 600;
      color: var(--navy);
      letter-spacing: -0.01em;
    }
    .nav-links { display: flex; gap: 2rem; list-style: none; }
    .nav-links a {
      font-size: 0.84rem;
      font-weight: 600;
      letter-spacing: 0.04em;
      text-transform: uppercase;
      color: var(--ink-muted);
      border-bottom: 2px solid transparent;
      padding-bottom: 2px;
      transition: color 0.2s, border-color 0.2s;
    }
    .nav-links a:hover, .nav-links a.active {
      color: var(--navy);
      border-color: var(--gold);
    }

    /* ─── Hero ───────────────────────────────────────────── */
    .hero {
      background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 50%, var(--color-accent) 100%);
      color: white;
      padding: 5rem 0 4rem;
      position: relative;
      overflow: hidden;
    }
    .hero::before {
      content: '';
      position: absolute;
      inset: 0;
      background: radial-gradient(ellipse at 70% 50%, rgba(12,82,168,0.22) 0%, transparent 65%),
                  radial-gradient(ellipse at 10% 80%, rgba(8,45,102,0.42) 0%, transparent 55%);
      pointer-events: none;
    }
    .hero-grid {
      display: grid;
      grid-template-columns: auto 1fr;
      gap: 3rem;
      align-items: center;
      position: relative;
      z-index: 1;
    }
    .hero-monogram {
      width: 120px; height: 120px;
      background: linear-gradient(135deg, #ffffff 0%, #dfeeff 100%);
      border-radius: 50%;
      display: flex; align-items: center; justify-content: center;
      font-family: var(--font-serif);
      font-size: 2.5rem;
      font-weight: 700;
      color: var(--color-primary-dark);
      flex-shrink: 0;
      letter-spacing: -0.02em;
    }
    .hero-sup {
      font-size: 0.72rem;
      font-weight: 700;
      letter-spacing: 0.18em;
      text-transform: uppercase;
      color: rgba(226,244,255,0.92);
      margin-bottom: 0.5rem;
    }
    .hero-name {
      font-family: var(--font-serif);
      font-size: 2.6rem;
      font-weight: 700;
      color: white;
      letter-spacing: -0.03em;
      line-height: 1.1;
      margin-bottom: 0.5rem;
    }
    .hero-role {
      font-size: 1.04rem;
      font-weight: 400;
      color: rgba(255,255,255,0.8);
      margin-bottom: 0.25rem;
    }
    .hero-inst {
      font-size: 0.92rem;
      color: rgba(255,255,255,0.55);
      margin-bottom: 1.5rem;
    }
    .chip-row { display: flex; flex-wrap: wrap; gap: 0.5rem; }
    .chip {
      padding: 0.3rem 0.85rem;
      border: 1px solid rgba(255,255,255,0.32);
      background: rgba(10,45,102,0.26);
      border-radius: 999px;
      font-size: 0.78rem;
      font-weight: 600;
      letter-spacing: 0.04em;
      color: rgba(255,255,255,0.85);
    }
    .hero-links { display: flex; gap: 1rem; flex-wrap: wrap; margin-top: 1.5rem; }
    .hero-link {
      display: flex; align-items: center; gap: 0.5rem;
      font-size: 0.84rem;
      font-weight: 600;
      color: rgba(255,255,255,0.7);
      transition: color 0.2s;
    }
    .hero-link:hover { color: #d7f0ff; }
    .hero-link svg { flex-shrink: 0; }

    /* ─── Metrics ────────────────────────────────────────── */
    .metrics-row {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 1.5rem;
    }
    .metric-card {
      background: var(--surface);
      border: 1px solid var(--rule);
      border-radius: var(--radius-lg);
      padding: 1.75rem;
      box-shadow: var(--shadow-sm);
      text-align: center;
      transition: transform var(--dur-base) var(--ease-standard), box-shadow var(--dur-base) var(--ease-soft), border-color var(--dur-base) var(--ease-soft);
    }
    .metric-card:hover {
      transform: translateY(-2px);
      box-shadow: var(--shadow-md);
      border-color: #ccd9e7;
    }
    .metric-platform {
      font-size: 0.78rem;
      font-weight: 700;
      letter-spacing: 0.1em;
      text-transform: uppercase;
      color: var(--ink-faint);
      margin-bottom: 1.25rem;
    }
    .metric-inner { display: flex; justify-content: center; gap: 2rem; flex-wrap: wrap; row-gap: 1rem; }
    .metric-val {
      font-family: var(--font-serif);
      font-size: 2.2rem;
      font-weight: 700;
      color: var(--navy);
      line-height: 1;
      display: block;
    }
    .metric-lbl {
      font-size: 0.74rem;
      letter-spacing: 0.06em;
      text-transform: uppercase;
      color: var(--ink-faint);
      margin-top: 0.3rem;
    }

    /* ─── Timeline ───────────────────────────────────────── */
    .timeline { display: flex; flex-direction: column; gap: 0; }
    .tl-item {
      display: grid;
      grid-template-columns: clamp(72px, 10vw, 96px) minmax(0, 1fr);
      gap: 1.5rem;
      padding: 1.25rem 0;
      border-bottom: 1px solid var(--rule);
      position: relative;
    }
    .tl-item:last-child { border-bottom: none; }
    .tl-year {
      font-size: 0.78rem;
      font-weight: 700;
      letter-spacing: 0.06em;
      text-transform: uppercase;
      color: var(--gold);
      padding-top: 0.1rem;
      text-align: right;
    }
    .tl-body {}
    .tl-title {
      font-size: 1rem;
      font-weight: 700;
      color: var(--ink);
      margin-bottom: 0.2rem;
    }
    .tl-sub {
      font-size: 0.9rem;
      color: var(--ink-muted);
    }
    .tl-period {
      font-size: 0.8rem;
      color: var(--ink-faint);
      margin-top: 0.15rem;
    }

    /* ─── Two Col Grid ───────────────────────────────────── */
    .col-2 { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 2rem; align-items: start; }
    .col-3 { display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); gap: 1.5rem; }

    /* ─── Card ───────────────────────────────────────────── */
    .card {
      background: var(--surface);
      border: 1px solid var(--rule);
      border-radius: var(--radius-lg);
      padding: 1.75rem;
      box-shadow: var(--shadow-sm);
      height: auto;
      transition: transform var(--dur-base) var(--ease-standard), box-shadow var(--dur-base) var(--ease-soft), border-color var(--dur-base) var(--ease-soft);
    }
    .card:hover {
      transform: translateY(-2px);
      box-shadow: var(--shadow-md);
      border-color: #ccd9e7;
    }
    .card-head {
      font-size: 0.72rem;
      font-weight: 700;
      letter-spacing: 0.14em;
      text-transform: uppercase;
      color: var(--gold);
      margin-bottom: 1.25rem;
      padding-bottom: 0.75rem;
      border-bottom: 1px solid var(--rule);
    }
    .stack-gap { margin-bottom: 1.5rem; }

    /* ─── Dot List ───────────────────────────────────────── */
    .dot-list { list-style: none; display: flex; flex-direction: column; gap: 0.75rem; }
    .dot-list li {
      font-size: 0.92rem;
      color: var(--ink-muted);
      padding-left: 1rem;
      position: relative;
      line-height: 1.55;
    }
    .dot-list li::before {
      content: '';
      position: absolute; left: 0; top: 0.58em;
      width: 5px; height: 5px;
      border-radius: 50%;
      background: var(--gold);
      flex-shrink: 0;
    }
    .dot-list li strong { color: var(--ink); font-weight: 600; }

    /* ─── Publications List ──────────────────────────────── */
    .pub-list { display: flex; flex-direction: column; gap: 0.7rem; }
    .pub-item {
      padding: 0.9rem 1rem;
      background: var(--surface);
      border: 1px solid var(--rule);
      border-left: 3px solid var(--navy);
      border-radius: 0 var(--radius) var(--radius) 0;
      display: grid;
      grid-template-columns: 36px 1fr;
      gap: 1rem;
      align-items: start;
      transition: transform var(--dur-base) var(--ease-standard), box-shadow var(--dur-base) var(--ease-soft);
    }
    .pub-item:hover {
      transform: translateY(-1px);
      box-shadow: var(--shadow-sm);
    }
    .pub-num {
      font-family: var(--font-serif);
      font-size: 1.1rem;
      color: var(--navy);
      font-weight: 600;
      padding-top: 2px;
      text-align: right;
    }
    .pub-title {
      font-size: 0.95rem;
      font-weight: 600;
      color: var(--ink);
      line-height: 1.45;
      margin-bottom: 0.35rem;
    }
    .pub-meta {
      font-size: 0.82rem;
      color: var(--ink-faint);
      display: flex;
      flex-wrap: wrap;
      gap: 0.5rem;
      align-items: center;
    }

    /* Keep long academic labels/IDs from overflowing cards */
    .tl-body,
    .dot-list li,
    .pub-title,
    .pub-meta,
    .review-title,
    .review-meta,
    .contact-val {
      overflow-wrap: anywhere;
      word-break: normal;
    }
    .pub-badge {
      background: #edf3fb;
      color: var(--navy-light);
      padding: 0.15rem 0.55rem;
      border-radius: 4px;
      font-weight: 700;
      font-size: 0.74rem;
      letter-spacing: 0.04em;
    }

    /* ─── Honors Grid ────────────────────────────────────── */
    .honor-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px,1fr)); gap: 1rem; }
    .honor-card {
      background: var(--surface);
      border: 1px solid var(--rule);
      border-radius: var(--radius-lg);
      padding: 1.25rem;
      display: flex; gap: 1rem; align-items: flex-start;
      transition: box-shadow 0.2s;
    }
    .honor-card:hover { box-shadow: var(--shadow); }
    .honor-ico {
      flex-shrink: 0;
      width: 38px; height: 38px;
      background: var(--navy);
      border-radius: var(--radius);
      display: flex; align-items: center; justify-content: center;
    }
    .honor-ico svg { color: white; }
    .honor-title { font-size: 0.88rem; font-weight: 700; color: var(--ink); margin-bottom: 0.2rem; }
    .honor-desc { font-size: 0.86rem; color: var(--ink-muted); line-height: 1.55; }
    .honor-date { font-size: 0.76rem; color: var(--gold); font-weight: 600; margin-top: 0.35rem; }

    /* ─── Reviews ────────────────────────────────────────── */
    .review-list { display: flex; flex-direction: column; gap: 0.6rem; }
    .review-item {
      background: var(--canvas);
      border: 1px solid var(--rule);
      border-left: 3px solid var(--navy);
      border-radius: 0 var(--radius) var(--radius) 0;
      padding: 0.75rem 1rem;
      transition: transform var(--dur-base) var(--ease-standard), box-shadow var(--dur-base) var(--ease-soft);
    }
    .review-item:hover {
      transform: translateY(-1px);
      box-shadow: var(--shadow-sm);
    }
    .review-title { font-size: 0.9rem; font-weight: 600; color: var(--ink); margin-bottom: 0.25rem; }
    .review-meta { font-size: 0.8rem; color: var(--ink-faint); display: flex; flex-wrap: wrap; gap: 0.5rem; }
    .r-badge {
      background: var(--navy);
      color: white;
      padding: 0.1rem 0.45rem;
      border-radius: 4px;
      font-size: 0.72rem;
      font-weight: 700;
    }
    .section-block-gap { margin-bottom: 2.5rem; }
    .service-highlight {
      margin-top: 1rem;
      padding: 0.75rem 1rem;
      background: var(--navy);
      border-radius: var(--radius);
      color: white;
      font-size: 0.8rem;
      font-weight: 600;
      text-align: center;
    }

    /* ─── Contact ────────────────────────────────────────── */
    .contact-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px,1fr)); gap: 1rem; }
    .contact-card {
      background: var(--surface);
      border: 1px solid var(--rule);
      border-radius: var(--radius-lg);
      padding: 1.25rem;
      display: flex; align-items: flex-start; gap: 1rem;
      transition: transform var(--dur-base) var(--ease-standard), box-shadow var(--dur-base) var(--ease-soft), border-color var(--dur-base) var(--ease-soft);
    }
    .contact-card:hover {
      transform: translateY(-2px);
      box-shadow: var(--shadow-sm);
      border-color: #ccd9e7;
    }
    .contact-ico {
      flex-shrink: 0;
      width: 38px; height: 38px;
      background: #edf3fb;
      border-radius: var(--radius);
      display: flex; align-items: center; justify-content: center;
    }
    .contact-ico svg { color: var(--navy); }
    .contact-lbl { font-size: 0.72rem; font-weight: 700; letter-spacing: 0.08em; text-transform: uppercase; color: var(--ink-faint); margin-bottom: 0.2rem; }
    .contact-val { font-size: 0.92rem; font-weight: 500; color: var(--ink); word-break: break-word; }

    /* ─── Stats Bar ──────────────────────────────────────── */
    .stats-bar {
      background: linear-gradient(90deg, var(--color-primary-dark) 0%, var(--color-primary) 65%, var(--color-accent) 100%);
      padding: 2rem 0;
    }
    .stats-inner {
      display: flex;
      justify-content: space-around;
      flex-wrap: wrap;
      gap: 1.5rem;
    }
    .stat-item { text-align: center; }
    .stat-val {
      font-family: var(--font-serif);
      font-size: 2.4rem;
      font-weight: 700;
      color: var(--gold-light);
      line-height: 1;
    }
    .stat-lbl {
      font-size: 0.78rem;
      font-weight: 600;
      letter-spacing: 0.08em;
      text-transform: uppercase;
      color: rgba(255,255,255,0.72);
      margin-top: 0.35rem;
    }

    /* ─── Accordion / Scrollable ─────────────────────────── */
    .scroll-box {
      max-height: 480px;
      overflow-y: auto;
      padding-right: 0.25rem;
    }
    .scroll-box::-webkit-scrollbar { width: 5px; }
    .scroll-box::-webkit-scrollbar-track { background: var(--rule); border-radius: 3px; }
    .scroll-box::-webkit-scrollbar-thumb { background: var(--navy-light); border-radius: 3px; }

    /* ─── Footer ─────────────────────────────────────────── */
    .footer {
      background: var(--ink);
      color: rgba(255,255,255,0.45);
      text-align: center;
      padding: 2.5rem 1.5rem;
      font-size: 0.85rem;
    }
    .footer strong { color: rgba(255,255,255,0.7); }
    .footer-note {
      margin-top: 0.4rem;
      display: block;
      font-size: 0.7rem;
    }

    /* ─── Animations ─────────────────────────────────────── */
    @keyframes fadeUp {
      from { opacity: 0; transform: translateY(14px); }
      to   { opacity: 1; transform: translateY(0); }
    }
    @keyframes heroFloat {
      0%, 100% { transform: translateY(0); }
      50% { transform: translateY(-2px); }
    }
    .animate { animation: fadeUp var(--dur-slow) var(--ease-standard) forwards; }
    .delay-1 { animation-delay: 0.1s; opacity: 0; }
    .delay-2 { animation-delay: 0.2s; opacity: 0; }
    .delay-3 { animation-delay: 0.3s; opacity: 0; }
    .delay-4 { animation-delay: 0.4s; opacity: 0; }
    .hero-monogram {
      animation: heroFloat 8s var(--ease-soft) infinite;
    }

    .reveal-init {
      opacity: 0;
      transform: translateY(12px);
      transition: opacity var(--dur-slow) var(--ease-standard), transform var(--dur-slow) var(--ease-standard);
      will-change: opacity, transform;
    }
    .reveal-init.visible {
      opacity: 1;
      transform: translateY(0);
    }

    @media (prefers-reduced-motion: reduce) {
      *, *::before, *::after {
        animation: none !important;
        transition: none !important;
        scroll-behavior: auto !important;
      }
      .reveal-init {
        opacity: 1;
        transform: none;
      }
    }

    /* ─── Responsive ─────────────────────────────────────── */
    @media (max-width: 1080px) {
      .col-2 { grid-template-columns: 1fr; }
      .metrics-row { grid-template-columns: repeat(2, minmax(0, 1fr)); }
      .metrics-row .metric-card:last-child { grid-column: 1 / -1; }
      .nav-links { gap: 1.25rem; }
    }

    @media (max-width: 900px) {
      .nav-links { display: none; }
      .col-3 { grid-template-columns: 1fr; }
    }

    @media (max-width: 800px) {
      .hero-grid { grid-template-columns: 1fr; text-align: center; }
      .hero-monogram { margin: 0 auto; }
      .chip-row, .hero-links { justify-content: center; }
      .metrics-row { grid-template-columns: 1fr; }
      .metrics-row .metric-card:last-child { grid-column: auto; }
      .section { padding: 3rem 0; }
      .hero { padding: 3rem 0; }
      .hero-name { font-size: 2rem; }
      .section-title { font-size: 1.6rem; }
    }

    @media (max-width: 620px) {
      .wrap { padding: 0 1rem; }
      .timeline .tl-item { grid-template-columns: 1fr; gap: 0.35rem; }
      .tl-year { text-align: left; padding-top: 0; }
      .scroll-box { max-height: none; overflow: visible; padding-right: 0; }
    }