:root {
  --ner-teal: #0f766e;
  --ner-teal-dark: #115e59;
  --ner-cyan: #06b6d4;
  --ner-amber: #f59e0b;
  --ner-slate: #0f172a;
  --ner-bg: #f8fafc;
  --ner-border: #e2e8f0;
}

html { font-size: 14px; }
@media (min-width: 768px) { html { font-size: 16px; } }

html { position: relative; min-height: 100%; scroll-behavior: smooth; }
body {
  min-height: 100vh;
  margin: 0;
  color: var(--ner-slate);
  background: linear-gradient(180deg, #f0fdfa 0, var(--ner-bg) 280px);
}

a { color: var(--ner-teal); }
a:hover { color: var(--ner-teal-dark); }

.btn-primary {
  --bs-btn-bg: var(--ner-teal);
  --bs-btn-border-color: var(--ner-teal);
  --bs-btn-hover-bg: var(--ner-teal-dark);
  --bs-btn-hover-border-color: var(--ner-teal-dark);
  --bs-btn-active-bg: var(--ner-teal-dark);
  --bs-btn-active-border-color: var(--ner-teal-dark);
}

.btn-outline-primary {
  --bs-btn-color: var(--ner-teal);
  --bs-btn-border-color: var(--ner-teal);
  --bs-btn-hover-bg: var(--ner-teal);
  --bs-btn-hover-border-color: var(--ner-teal);
}

.form-control:focus, .form-check-input:focus, .btn:focus {
  border-color: var(--ner-cyan);
  box-shadow: 0 0 0 .2rem rgba(6, 182, 212, .15);
}

.app-header { position: sticky; top: 0; z-index: 1030; backdrop-filter: blur(8px); }
.app-main { padding-top: 2rem; padding-bottom: 4rem; min-height: calc(100vh - 150px); }
.app-footer { padding: 1.25rem 0; background: #fff; color: #475569; }

.ner-brand { display: inline-flex; align-items: center; gap: .75rem; text-decoration: none; color: var(--ner-slate); }
.ner-brand:hover { color: var(--ner-slate); }
.ner-wordmark { display: flex; flex-direction: column; line-height: 1; }
.ner-wordmark strong { font-size: 1rem; letter-spacing: .08em; }
.ner-brand small { display: block; margin-top: .18rem; font-size: .68rem; color: #64748b; line-height: 1.1; }
.ner-tamil { display: block; margin-bottom: .14rem; color: var(--ner-teal-dark); font-size: .94rem; font-weight: 800; letter-spacing: .02em; line-height: 1.05; }
.ner-logo {
  display: inline-grid; place-items: center; width: 2.55rem; height: 2.55rem;
  border-radius: .8rem; color: #fff; font-weight: 800;
  background: linear-gradient(135deg, var(--ner-teal), var(--ner-cyan));
  box-shadow: 0 8px 24px rgba(15, 118, 110, .2);
}

.page-header { margin-bottom: 1.5rem; }
.page-header h1 { font-weight: 750; letter-spacing: -.03em; }
.eyebrow { color: var(--ner-teal); font-size: .78rem; text-transform: uppercase; font-weight: 800; letter-spacing: .12em; margin-bottom: .35rem; }

.content-card {
  background: rgba(255,255,255,.96);
  border: 1px solid var(--ner-border);
  border-radius: 1rem;
  padding: 1.5rem;
  box-shadow: 0 10px 30px rgba(15, 23, 42, .05);
}
.section-title { font-size: 1rem; font-weight: 800; margin-bottom: 1rem; }

.table > :not(caption) > * > * { padding: 1rem 1.1rem; }
.table thead th { color: #64748b; font-size: .78rem; text-transform: uppercase; letter-spacing: .04em; background: #f8fafc; border-bottom-width: 1px; }

.code-pill, .status-pill {
  display: inline-flex; align-items: center; border-radius: 999px; padding: .28rem .65rem;
  font-size: .78rem; font-weight: 700;
}
.code-pill { background: #ecfeff; color: #155e75; }
.status-active { background: #dcfce7; color: #166534; }
.status-inactive { background: #f1f5f9; color: #64748b; }

.person-row { display: flex; align-items: center; gap: .8rem; }
.avatar-circle {
  width: 2.6rem; height: 2.6rem; border-radius: 50%; display: grid; place-items: center;
  background: linear-gradient(135deg, #ccfbf1, #cffafe); color: var(--ner-teal-dark); font-weight: 800;
}
.detail-list dt { color: #64748b; font-weight: 600; }

.auth-shell { min-height: 68vh; display: grid; place-items: center; padding: 2rem 0; }
.auth-card {
  width: min(100%, 440px); background: #fff; border: 1px solid var(--ner-border); border-radius: 1.25rem;
  padding: 2rem; box-shadow: 0 20px 50px rgba(15,23,42,.08);
}
.brand-mark { color: var(--ner-teal); font-weight: 900; letter-spacing: .15em; margin-bottom: .85rem; }

.hero {
  position: relative; overflow: hidden; border-radius: 1.5rem; padding: clamp(2rem, 5vw, 5rem);
  color: #fff; background: linear-gradient(135deg, #0f766e, #0891b2 68%, #06b6d4);
  box-shadow: 0 24px 70px rgba(15,118,110,.22);
}
.hero::after { content: ""; position: absolute; width: 340px; height: 340px; border-radius: 50%; right: -120px; top: -140px; background: rgba(255,255,255,.12); }
.hero h1 { font-size: clamp(2.4rem, 6vw, 5rem); font-weight: 850; letter-spacing: -.05em; max-width: 820px; }
.hero p { font-size: 1.15rem; max-width: 680px; color: rgba(255,255,255,.88); }
.feature-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 1rem; margin-top: 1.5rem; }
.feature-card { background: #fff; border: 1px solid var(--ner-border); border-radius: 1rem; padding: 1.25rem; }
.feature-card strong { display: block; margin-bottom: .35rem; }

.process-map-section { scroll-margin-top: 6.5rem; }
.process-roadmap { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1rem; }
.process-card {
  position: relative; display: grid; grid-template-columns: auto 1fr; gap: 1rem; align-items: start;
  min-height: 190px; padding: 1.35rem; background: rgba(255,255,255,.96); border: 1px solid var(--ner-border);
  border-radius: 1rem; box-shadow: 0 12px 30px rgba(15,23,42,.045);
}
.process-card::after { content: ""; position: absolute; left: 2.05rem; top: 4.25rem; bottom: -1.05rem; width: 2px; background: linear-gradient(var(--ner-cyan), transparent); opacity: .35; }
.process-card:nth-last-child(-n+2)::after { display: none; }
.process-number {
  display: grid; place-items: center; width: 2.9rem; height: 2.9rem; border-radius: .9rem; color: #fff; font-weight: 850;
  background: linear-gradient(135deg, var(--ner-teal), var(--ner-cyan)); box-shadow: 0 8px 20px rgba(15,118,110,.15);
}
.process-kicker { color: var(--ner-teal); font-size: .72rem; font-weight: 800; text-transform: uppercase; letter-spacing: .1em; }
.process-card h3 { margin: .18rem 0 .45rem; font-size: 1.05rem; font-weight: 800; }
.process-card p { margin: 0; color: #64748b; }
.process-card .btn { grid-column: 2; justify-self: start; }

.guide-modal { border: 0; border-radius: 1.25rem; overflow: hidden; box-shadow: 0 30px 90px rgba(15,23,42,.25); }
.guide-modal .modal-header { padding: 1.35rem 1.5rem; color: #fff; background: linear-gradient(135deg, var(--ner-teal-dark), #0e7490); }
.guide-progress { height: 5px; background: #e2e8f0; }
.guide-progress-bar { width: 0; height: 100%; background: linear-gradient(90deg, var(--ner-teal), var(--ner-cyan)); transition: width .25s ease; }
.guide-modal .modal-body { min-height: 500px; padding: clamp(1.4rem, 3vw, 2.5rem); background: #f8fafc; }
.guide-modal .modal-footer { padding: 1rem 1.5rem; background: #fff; }
.guide-step { max-width: 1020px; margin: 0 auto; }
.guide-step-number {
  display: grid; place-items: center; width: 3.25rem; height: 3.25rem; margin-bottom: 1rem; border-radius: 1rem;
  background: linear-gradient(135deg, #ccfbf1, #cffafe); color: var(--ner-teal-dark); font-size: 1.15rem; font-weight: 900;
}
.guide-step h3 { font-size: clamp(1.55rem, 3vw, 2.25rem); font-weight: 850; letter-spacing: -.035em; }
.guide-lead { max-width: 870px; color: #475569; font-size: 1.05rem; }
.concept-chain { display: flex; flex-wrap: wrap; gap: .55rem; margin: 1.4rem 0; }
.concept-chain span { position: relative; padding: .62rem .85rem; border: 1px solid #99f6e4; border-radius: .75rem; background: #f0fdfa; color: #134e4a; font-weight: 750; }
.concept-chain span:not(:last-child)::after { content: "›"; position: absolute; right: -.43rem; top: 50%; transform: translate(50%,-50%); color: #0f766e; font-size: 1.2rem; font-weight: 900; }
.concept-grid, .route-compare { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: .8rem; margin: 1.35rem 0; }
.concept-grid > div, .route-compare > div { padding: 1rem; border: 1px solid var(--ner-border); border-radius: .9rem; background: #fff; }
.concept-grid strong, .route-compare strong { display: block; margin-bottom: .25rem; color: var(--ner-slate); }
.concept-grid span, .route-compare span { color: #64748b; }
.why-box { display: grid; grid-template-columns: 130px 1fr; gap: 1rem; margin-top: 1.2rem; padding: 1rem 1.1rem; border-radius: .9rem; background: #ecfeff; border: 1px solid #a5f3fc; }
.why-box strong { color: #155e75; }
.why-box span { color: #334155; }
.guide-note { margin-top: 1rem; padding: 1rem 1.1rem; border-left: 4px solid var(--ner-amber); border-radius: .35rem .8rem .8rem .35rem; background: #fffbeb; color: #57534e; }
.guide-counter { font-weight: 700; }

@media (max-width: 991.98px) {
  .process-roadmap { grid-template-columns: 1fr; }
  .process-card::after { display: none; }
}

@media (max-width: 767.98px) {
  .app-main { padding-top: 1.25rem; }
  .content-card { padding: 1.1rem; }
  .page-header { margin-bottom: 1rem; }
  .process-card { grid-template-columns: auto 1fr; min-height: 0; }
  .concept-grid, .route-compare { grid-template-columns: 1fr; }
  .why-box { grid-template-columns: 1fr; gap: .25rem; }
  .guide-modal .modal-body { min-height: 0; }
}

/* Guided tour viewport/layout hardening */
#platformGuide .modal-dialog {
  height: calc(100vh - 2rem);
  margin-top: 1rem;
  margin-bottom: 1rem;
}

#platformGuide .modal-content {
  height: 100%;
  max-height: calc(100vh - 2rem);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

#platformGuide .modal-header,
#platformGuide .guide-progress,
#platformGuide .modal-footer {
  flex: 0 0 auto;
}

#platformGuide .modal-body {
  flex: 1 1 auto;
  min-height: 0;
  overflow-y: auto;
  overscroll-behavior: contain;
}

#platformGuide .modal-footer {
  position: relative;
  z-index: 2;
  box-shadow: 0 -8px 20px rgba(15, 23, 42, .06);
}

#platformGuide .modal-footer .btn {
  min-width: 96px;
}

@media (max-width: 575.98px) {
  #platformGuide .modal-dialog {
    height: calc(100vh - 1rem);
    margin: .5rem;
  }

  #platformGuide .modal-content {
    max-height: calc(100vh - 1rem);
  }

  #platformGuide .modal-footer {
    gap: .75rem;
    align-items: center;
  }

  #platformGuide .modal-footer > .d-flex {
    width: 100%;
    justify-content: flex-end;
  }

  #platformGuide .guide-counter {
    white-space: nowrap;
  }
}