/* =========================================================================
   SimSage HIT — Prototype stylesheet (Fresh Neutral / blue theme)
   Single cohesive theme. Structure + components for the full app prototype.
   ========================================================================= */

:root {
  /* Palette */
  --color-brand:        #3b5bdb;
  --color-brand-strong: #2f49af;
  --color-accent:       #5c7cfa;
  --color-bg:           #f5f7fa;
  --color-surface:      #ffffff;
  --color-surface-2:    #f1f4f8;
  --color-border:       #e2e8f0;
  --color-text:         #1a2233;
  --color-text-muted:   #64748b;
  --color-on-brand:     #ffffff;
  --color-sidebar:      #1a2233;
  --color-sidebar-2:    #232d42;
  --color-sidebar-text: #c4ccdb;
  --color-success:      #2f9e6e;
  --color-success-bg:   #e6f5ee;
  --color-danger:       #d64545;
  --color-danger-bg:    #fdecec;

  /* Typography */
  --font-sans: "Inter", "Segoe UI", system-ui, -apple-system, BlinkMacSystemFont,
               "Helvetica Neue", Arial, sans-serif;
  --fs-xs:   0.75rem;
  --fs-sm:   0.875rem;
  --fs-base: 1rem;
  --fs-lg:   1.125rem;
  --fs-xl:   1.375rem;
  --fs-2xl:  1.875rem;
  --fs-3xl:  2.5rem;

  /* Spacing */
  --sp-1: 0.25rem;  --sp-2: 0.5rem;  --sp-3: 0.75rem;  --sp-4: 1rem;
  --sp-5: 1.5rem;   --sp-6: 2rem;    --sp-7: 3rem;

  /* Shape & depth */
  --radius-sm: 8px;
  --radius:    14px;
  --radius-lg: 20px;
  --shadow-sm: 0 1px 2px rgba(30, 41, 59, 0.06);
  --shadow:    0 8px 24px rgba(30, 41, 59, 0.08);
  --shadow-lg: 0 20px 50px rgba(30, 41, 59, 0.14);
  --ring:      0 0 0 3px color-mix(in srgb, var(--color-brand) 26%, transparent);

  --sidebar-w: 248px;
}

/* ---- Reset ------------------------------------------------------------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: var(--fs-base);
  line-height: 1.55;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
img, svg { display: block; max-width: 100%; }
a { color: var(--color-brand-strong); }
button { font-family: inherit; }

/* ---- Top bar ----------------------------------------------------------- */
.topbar {
  position: sticky; top: 0; z-index: 20;
  display: flex; align-items: center; justify-content: space-between;
  gap: var(--sp-4);
  padding: var(--sp-3) var(--sp-5);
  background: var(--color-brand);
  color: var(--color-on-brand);
  box-shadow: var(--shadow-sm);
}
.topbar__brand {
  display: flex; align-items: center; gap: var(--sp-3);
  color: var(--color-on-brand); text-decoration: none;
  font-weight: 600; letter-spacing: 0.01em;
}
.topbar__brand .logo {
  height: 34px; width: 34px; border-radius: var(--radius-sm);
  object-fit: cover; background: rgba(255,255,255,0.14); padding: 3px;
}
.topbar__brand small {
  display: block; font-weight: 400; font-size: var(--fs-xs);
  opacity: 0.82; letter-spacing: 0.04em; text-transform: uppercase;
}
.topbar__right { display: flex; align-items: center; gap: var(--sp-3); }
.topbar__user { font-size: var(--fs-sm); opacity: 0.92; }
.topbar__link {
  color: var(--color-on-brand); text-decoration: none; font-size: var(--fs-sm);
  padding: var(--sp-2) var(--sp-3); border-radius: var(--radius-sm); opacity: 0.92;
  transition: background-color 0.15s ease, opacity 0.15s ease;
}
.topbar__link:hover { background: rgba(255,255,255,0.16); opacity: 1; }
.badge-role {
  font-size: var(--fs-xs); font-weight: 600; letter-spacing: 0.04em;
  padding: var(--sp-1) var(--sp-3); border-radius: 999px;
  background: rgba(255,255,255,0.18);
}

/* ---- App shell (sidebar + content) ------------------------------------ */
.app { min-height: 100vh; display: flex; flex-direction: column; }
.app__body { flex: 1; display: grid; grid-template-columns: var(--sidebar-w) 1fr; }

.sidebar {
  background: var(--color-sidebar);
  color: var(--color-sidebar-text);
  padding: var(--sp-5) var(--sp-3);
  display: flex; flex-direction: column; gap: var(--sp-2);
}
.sidebar__group {
  font-size: var(--fs-xs); text-transform: uppercase; letter-spacing: 0.1em;
  color: #7d8aa3; padding: var(--sp-3) var(--sp-3) var(--sp-2);
}
.sidebar__link {
  display: flex; align-items: center; gap: var(--sp-3);
  color: var(--color-sidebar-text); text-decoration: none;
  font-size: var(--fs-sm); font-weight: 500;
  padding: var(--sp-3) var(--sp-3); border-radius: var(--radius-sm);
  transition: background-color 0.15s ease, color 0.15s ease;
}
.sidebar__link:hover { background: var(--color-sidebar-2); color: #fff; }
.sidebar__link.is-active {
  background: var(--color-brand); color: #fff; box-shadow: var(--shadow-sm);
}
.sidebar__link .ico { width: 18px; text-align: center; opacity: 0.9; }
.sidebar__spacer { flex: 1; }
.sidebar__logout { color: #9aa6bd; }
.sidebar__logout:hover { background: var(--color-sidebar-2); color: #fff; }

.content { padding: var(--sp-6) var(--sp-6) var(--sp-7); }
.content__inner { max-width: 980px; margin: 0 auto; }

/* ---- Page header ------------------------------------------------------- */
.page-head { margin-bottom: var(--sp-5); }
.h-eyebrow {
  font-size: var(--fs-xs); text-transform: uppercase; letter-spacing: 0.12em;
  color: var(--color-text-muted); margin: 0 0 var(--sp-2);
}
h1.title { font-size: var(--fs-2xl); margin: 0 0 var(--sp-2); line-height: 1.15; }
h2.title { font-size: var(--fs-xl); margin: 0 0 var(--sp-2); }
.lead { color: var(--color-text-muted); margin: 0 0 var(--sp-5); max-width: 70ch; }

/* Contextual documentation link (app page -> matching guide section) */
.doc-link {
  display: inline-flex; align-items: center; gap: var(--sp-2);
  font-size: var(--fs-sm); font-weight: 600; text-decoration: none;
  color: var(--color-brand-strong);
  padding: var(--sp-2) var(--sp-3); border-radius: var(--radius-sm);
  background: color-mix(in srgb, var(--color-brand) 8%, var(--color-surface));
  border: 1px solid color-mix(in srgb, var(--color-brand) 22%, var(--color-border));
  transition: background-color 0.15s ease, border-color 0.15s ease;
}
.doc-link:hover { background: color-mix(in srgb, var(--color-brand) 14%, var(--color-surface)); border-color: var(--color-brand); }
.doc-link .ico { font-size: 1rem; }

/* ---- Cards & sections -------------------------------------------------- */
.card {
  background: var(--color-surface); border: 1px solid var(--color-border);
  border-radius: var(--radius-lg); box-shadow: var(--shadow); padding: var(--sp-6);
}
.card--narrow { max-width: 420px; width: 100%; }
.card + .card { margin-top: var(--sp-5); }

.section { margin-bottom: var(--sp-6); }
.section:last-child { margin-bottom: 0; }
.section__title {
  font-size: var(--fs-sm); text-transform: uppercase; letter-spacing: 0.08em;
  color: var(--color-brand-strong); margin: 0 0 var(--sp-3);
  padding-bottom: var(--sp-2); border-bottom: 1px solid var(--color-border);
}

/* ---- Forms ------------------------------------------------------------- */
.form-grid {
  display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: var(--sp-4);
}
.form-grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.field { display: flex; flex-direction: column; gap: var(--sp-2); }
.field--full { grid-column: 1 / -1; }
.field label { font-size: var(--fs-sm); font-weight: 600; color: var(--color-text); }
.field .hint { font-size: var(--fs-xs); color: var(--color-text-muted); font-weight: 400; }

.input, .input-group input, select.input, textarea.input {
  width: 100%; font: inherit; color: var(--color-text);
  background: var(--color-surface-2); border: 1px solid var(--color-border);
  border-radius: var(--radius-sm); padding: var(--sp-3);
  transition: border-color 0.15s ease, box-shadow 0.15s ease, background-color 0.15s ease;
}
.input:focus, .input-group input:focus, select.input:focus, textarea.input:focus {
  outline: none; background: var(--color-surface);
  border-color: var(--color-brand); box-shadow: var(--ring);
}
.input::placeholder { color: color-mix(in srgb, var(--color-text-muted) 70%, transparent); }
.input-group { display: flex; gap: var(--sp-2); }
.input-group input { flex: 1; }

/* ---- Buttons ----------------------------------------------------------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: var(--sp-2);
  font: inherit; font-weight: 600; line-height: 1;
  padding: var(--sp-3) var(--sp-5); border-radius: var(--radius-sm);
  border: 1px solid transparent; cursor: pointer; text-decoration: none;
  transition: transform 0.05s ease, background-color 0.15s ease,
              border-color 0.15s ease, box-shadow 0.15s ease;
}
.btn:active { transform: translateY(1px); }
.btn--primary { background: var(--color-brand); color: var(--color-on-brand); box-shadow: var(--shadow-sm); }
.btn--primary:hover { background: var(--color-brand-strong); }
.btn--ghost { background: transparent; color: var(--color-brand-strong); border-color: var(--color-border); }
.btn--ghost:hover { background: var(--color-surface-2); border-color: var(--color-brand); }
.btn--sm { padding: var(--sp-2) var(--sp-3); font-size: var(--fs-sm); font-weight: 500; }
.btn--block { width: 100%; }
.form-actions { display: flex; gap: var(--sp-3); margin-top: var(--sp-6); flex-wrap: wrap; }

/* ---- Dashboard tiles --------------------------------------------------- */
.tile-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: var(--sp-4);
}
.tile {
  display: flex; flex-direction: column; gap: var(--sp-2);
  background: var(--color-surface); border: 1px solid var(--color-border);
  border-radius: var(--radius); padding: var(--sp-5);
  text-decoration: none; color: inherit; box-shadow: var(--shadow-sm);
  transition: transform 0.1s ease, box-shadow 0.15s ease, border-color 0.15s ease;
}
.tile:hover { transform: translateY(-2px); box-shadow: var(--shadow); border-color: color-mix(in srgb, var(--color-brand) 40%, var(--color-border)); }
.tile__icon {
  width: 42px; height: 42px; border-radius: 11px; display: grid; place-items: center;
  background: color-mix(in srgb, var(--color-brand) 14%, var(--color-surface));
  color: var(--color-brand-strong); font-size: var(--fs-lg); margin-bottom: var(--sp-2);
}
.tile__title { font-weight: 700; font-size: var(--fs-lg); }
.tile__desc { color: var(--color-text-muted); font-size: var(--fs-sm); }
.tile__cta { margin-top: auto; color: var(--color-brand-strong); font-size: var(--fs-sm); font-weight: 600; padding-top: var(--sp-3); }

/* ---- Result metrics ---------------------------------------------------- */
.metrics {
  display: grid; grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--sp-4); margin-bottom: var(--sp-5);
}
.metric {
  background: var(--color-surface-2); border: 1px solid var(--color-border);
  border-radius: var(--radius); padding: var(--sp-5);
}
.metric--hero {
  grid-column: 1 / -1;
  background: linear-gradient(135deg, color-mix(in srgb, var(--color-brand) 14%, var(--color-surface)), var(--color-surface));
  border-color: color-mix(in srgb, var(--color-brand) 30%, var(--color-border));
}
.metric__label {
  font-size: var(--fs-xs); text-transform: uppercase; letter-spacing: 0.07em;
  color: var(--color-text-muted); margin: 0 0 var(--sp-2);
}
.metric__value { font-size: var(--fs-2xl); font-weight: 700; color: var(--color-text); line-height: 1.1; }
.metric--hero .metric__value { font-size: var(--fs-3xl); color: var(--color-brand-strong); }
.metric__unit { font-size: var(--fs-sm); font-weight: 500; color: var(--color-text-muted); }

.notes {
  background: var(--color-surface-2); border: 1px dashed var(--color-border);
  border-radius: var(--radius); padding: var(--sp-4) var(--sp-5);
  color: var(--color-text-muted); font-size: var(--fs-sm);
}
.notes strong { color: var(--color-text); }

/* ---- Summary list ------------------------------------------------------ */
.summary {
  display: grid; grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--sp-2) var(--sp-5); margin: 0 0 var(--sp-5); padding: 0; list-style: none;
}
.summary li {
  display: flex; justify-content: space-between; gap: var(--sp-4);
  padding: var(--sp-2) 0; border-bottom: 1px solid var(--color-border); font-size: var(--fs-sm);
}
.summary .k { color: var(--color-text-muted); }
.summary .v { font-weight: 600; }

/* ---- Tables ------------------------------------------------------------ */
.table-wrap { overflow-x: auto; border: 1px solid var(--color-border); border-radius: var(--radius); }
.table { width: 100%; border-collapse: collapse; font-size: var(--fs-sm); background: var(--color-surface); }
.table thead th {
  text-align: left; font-size: var(--fs-xs); text-transform: uppercase; letter-spacing: 0.06em;
  color: var(--color-text-muted); font-weight: 600;
  padding: var(--sp-3) var(--sp-4); border-bottom: 1px solid var(--color-border);
  background: var(--color-surface-2); white-space: nowrap;
}
.table tbody td { padding: var(--sp-3) var(--sp-4); border-bottom: 1px solid var(--color-border); }
.table tbody tr:last-child td { border-bottom: none; }
.table tbody tr:hover { background: var(--color-surface-2); }
.table .num { text-align: right; font-variant-numeric: tabular-nums; }

/* ---- Upload dropzone --------------------------------------------------- */
.dropzone {
  border: 2px dashed color-mix(in srgb, var(--color-brand) 35%, var(--color-border));
  border-radius: var(--radius); background: var(--color-surface-2);
  padding: var(--sp-7) var(--sp-5); text-align: center; color: var(--color-text-muted);
  transition: border-color 0.15s ease, background-color 0.15s ease;
}
.dropzone:hover { border-color: var(--color-brand); background: color-mix(in srgb, var(--color-brand) 6%, var(--color-surface-2)); }
.dropzone__icon { font-size: 2rem; margin-bottom: var(--sp-2); }
.dropzone strong { color: var(--color-text); }
.dropzone input[type=file] { display: block; margin: var(--sp-4) auto 0; }

/* ---- Alerts ------------------------------------------------------------ */
.alert {
  border-radius: var(--radius-sm); padding: var(--sp-3) var(--sp-4);
  font-size: var(--fs-sm); margin-bottom: var(--sp-5); border: 1px solid transparent;
}
.alert--success { background: var(--color-success-bg); color: #1d6b4a; border-color: #bfe6d2; }
.alert--info { background: color-mix(in srgb, var(--color-brand) 8%, var(--color-surface)); color: var(--color-brand-strong); border-color: color-mix(in srgb, var(--color-brand) 24%, var(--color-border)); }
.alert--error { background: var(--color-danger-bg); color: #a12b2b; border-color: color-mix(in srgb, var(--color-danger) 40%, var(--color-border)); }

/* ---- Required-field validation highlight ------------------------------- */
.input.is-invalid,
.field.is-invalid .input {
  border-color: var(--color-danger);
  background: var(--color-danger-bg);
}
.input.is-invalid:focus,
.field.is-invalid .input:focus {
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--color-danger) 26%, transparent);
}
.field.is-invalid label { color: var(--color-danger); }

/* ---- Helpers ----------------------------------------------------------- */
.pill {
  display: inline-block; font-size: var(--fs-xs); font-weight: 600; letter-spacing: 0.04em;
  padding: var(--sp-1) var(--sp-3); border-radius: 999px;
  background: color-mix(in srgb, var(--color-brand) 14%, var(--color-surface));
  color: var(--color-brand-strong); border: 1px solid color-mix(in srgb, var(--color-brand) 26%, var(--color-border));
}
.center { text-align: center; }
.muted { color: var(--color-text-muted); }
.stack-sm > * + * { margin-top: var(--sp-3); }

/* ---- Standalone (login) page ------------------------------------------ */
.page-centered { min-height: 100vh; display: flex; flex-direction: column; }
.page-centered .login-body {
  flex: 1; display: flex; align-items: center; justify-content: center; padding: var(--sp-6);
}

/* ---- Footer ------------------------------------------------------------ */
.footer { border-top: 1px solid var(--color-border); color: var(--color-text-muted); font-size: var(--fs-xs); background: var(--color-surface); }
.footer__inner { max-width: 980px; margin: 0 auto; padding: var(--sp-5); display: flex; flex-direction: column; gap: var(--sp-2); }
.footer__row { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: var(--sp-2); }
.footer a { color: var(--color-brand-strong); }

/* ---- Link back to the legacy interface --------------------------------- */
.legacy-link {
  position: fixed;
  right: var(--sp-4);
  bottom: var(--sp-4);
  z-index: 50;
  padding: var(--sp-3) var(--sp-5);
  border: none;
  border-radius: 999px;
  background: var(--color-brand);
  box-shadow: 0 2px 8px rgba(59, 91, 219, 0.35);
  color: var(--color-on-brand);
  font-size: var(--fs-sm);
  font-weight: 600;
  text-decoration: none;
}
.legacy-link:hover { background: var(--color-brand-strong); box-shadow: 0 3px 12px rgba(59, 91, 219, 0.45); }

/* ---- Responsive -------------------------------------------------------- */
@media (max-width: 880px) {
  .app__body { grid-template-columns: 1fr; }
  .sidebar { flex-direction: row; flex-wrap: wrap; padding: var(--sp-3); gap: var(--sp-2); position: sticky; top: 56px; z-index: 10; }
  .sidebar__group, .sidebar__spacer { display: none; }
  .sidebar__link { padding: var(--sp-2) var(--sp-3); }
}
@media (max-width: 680px) {
  .content { padding: var(--sp-5) var(--sp-4) var(--sp-6); }
  .card { padding: var(--sp-5); }
  .form-grid, .form-grid--3 { grid-template-columns: 1fr; }
  .metrics { grid-template-columns: 1fr; }
  .summary { grid-template-columns: 1fr; }
  .topbar__brand small, .topbar__user { display: none; }
  h1.title { font-size: var(--fs-xl); }
}