/* AE Research Scholars — styled to match ae.psu.edu
   Colors pulled from engr.psu.edu/styles-nov2 common + department CSS.
   Fonts: Roboto Slab (headings) + Roboto (body) — same as ae.psu.edu */

:root {
  --ink: #0a2240;
  --gold: #83acd5;
  --gold-dim: #6b94bd;
  --paper: #ffffff;
  --sand: #e5e6e8;
  --navy: #002f87;
  --navy-light: #1a4a9e;
  --steel: #4A6680;
  --text: #231f20;
  --text-secondary: #555555;
  --border: #d2d8e1;
  --card-bg: #ffffff;
  --code-bg: #f0f3f6;
  --hero-bg: #0a2240;
  --hero-text: #ffffff;
  --hero-accent: #83acd5;
  --hero-sub: #b0c8e0;
  --success: #28745a;
  --success-bg: #d4edda;
  --error: #a8323c;
  --error-bg: #f8d7da;
  --warning-bg: #fff3cd;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --ink: #e0e6ee;
    --paper: #0a1628;
    --sand: #111e34;
    --text: #c8d0dc;
    --text-secondary: #8b9298;
    --border: #253350;
    --card-bg: #0f1d34;
    --code-bg: #142040;
    --navy: #6ba3d4;
    --navy-light: #7db8e8;
    --steel: #8aa4ba;
    --gold: #83acd5;
    --gold-dim: #6b94bd;
    --hero-bg: #060e1c;
    --hero-text: #e0e6ee;
    --hero-accent: #83acd5;
    --hero-sub: #6b8aaa;
    --success: #4caf6e;
    --success-bg: #1a3328;
    --error: #e06070;
    --error-bg: #3a1c22;
    --warning-bg: #3a3018;
  }
}

:root[data-theme="dark"] {
  --ink: #e0e6ee;
  --paper: #0a1628;
  --sand: #111e34;
  --text: #c8d0dc;
  --text-secondary: #8b9298;
  --border: #253350;
  --card-bg: #0f1d34;
  --code-bg: #142040;
  --navy: #6ba3d4;
  --navy-light: #7db8e8;
  --steel: #8aa4ba;
  --gold: #83acd5;
  --gold-dim: #6b94bd;
  --hero-bg: #060e1c;
  --hero-text: #e0e6ee;
  --hero-accent: #83acd5;
  --hero-sub: #6b8aaa;
  --success: #4caf6e;
  --success-bg: #1a3328;
  --error: #e06070;
  --error-bg: #3a1c22;
  --warning-bg: #3a3018;
}

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

body {
  font-family: 'Roboto', Verdana, Arial, sans-serif;
  font-size: 17px;
  line-height: 1.7;
  color: var(--text);
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
}

a { color: var(--navy); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ---- NAV ---- */

.site-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--hero-bg);
  border-bottom: 1px solid rgba(255,255,255,0.08);
}

.nav-inner {
  max-width: 1060px;
  margin: 0 auto;
  padding: 0 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 52px;
}

.nav-brand {
  font-family: 'Roboto Slab', Georgia, serif;
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--hero-text);
  text-decoration: none;
  letter-spacing: 0.04em;
}

.nav-brand span { color: var(--hero-accent); }

.nav-links {
  display: flex;
  gap: 1.8rem;
  list-style: none;
}

.nav-links a {
  font-size: 0.82rem;
  color: var(--hero-sub);
  text-decoration: none;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  transition: color 0.2s;
}

.nav-links a:hover,
.nav-links a:focus-visible { color: var(--hero-accent); }

.nav-links a.active { color: var(--hero-accent); }

@media (max-width: 640px) {
  .nav-links { gap: 1rem; }
  .nav-links a { font-size: 0.75rem; }
}

/* ---- HERO ---- */

.hero {
  background: var(--hero-bg);
  color: var(--hero-text);
  padding: 5rem 2rem 4.5rem;
  position: relative;
  overflow: hidden;
}

.hero--compact {
  padding: 3rem 2rem 2.5rem;
}

.hero::after {
  content: '';
  position: absolute;
  bottom: 0; left: 0; right: 0;
  height: 2px;
  background: var(--hero-accent);
  opacity: 0.5;
}

.hero-inner {
  max-width: 780px;
  margin: 0 auto;
}

.hero-eyebrow {
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--hero-accent);
  margin-bottom: 0.8rem;
}

.hero h1 {
  font-family: 'Roboto Slab', Georgia, serif;
  font-size: clamp(1.6rem, 4vw, 2.4rem);
  font-weight: 400;
  line-height: 1.3;
  margin-bottom: 1.2rem;
}

.hero h1 em { font-style: normal; color: var(--hero-accent); }

.hero-summary {
  font-size: 1.05rem;
  line-height: 1.65;
  color: var(--hero-sub);
  max-width: 620px;
}

/* ---- SECTIONS ---- */

.section { padding: 3.5rem 2rem; }
.section--base { border-bottom: 1px solid var(--border); }

.section-inner {
  max-width: 780px;
  margin: 0 auto;
}

.section-label {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--gold);
  margin-bottom: 0.6rem;
}

.section h2 {
  font-family: 'Roboto Slab', Georgia, serif;
  font-size: 1.5rem;
  font-weight: 400;
  color: var(--ink);
  margin-bottom: 1.2rem;
}

.section p { margin-bottom: 1rem; }

/* ---- CARDS ---- */

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.2rem;
  margin-top: 1.5rem;
}

.card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 1.4rem;
}

.card h3 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 0.4rem;
}
.card h3 a {
  color: inherit;
  text-decoration: none;
}
.card h3 a:hover {
  text-decoration: underline;
}

.card .meta {
  font-size: 0.82rem;
  color: var(--text-secondary);
  margin-bottom: 0.6rem;
}

.card p, .card .description {
  font-size: 0.9rem;
  line-height: 1.55;
}

/* ---- FORMS ---- */

.form-section {
  margin-bottom: 2rem;
}

.form-section h2 {
  font-family: 'Roboto Slab', Georgia, serif;
  font-size: 1.15rem;
  font-weight: 400;
  color: var(--ink);
  border-bottom: 2px solid var(--gold);
  padding-bottom: 0.4rem;
  margin-bottom: 1.25rem;
}

.form-group { margin-bottom: 1.25rem; }

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

@media (max-width: 600px) { .form-row { grid-template-columns: 1fr; } }

label {
  display: block;
  font-weight: 500;
  font-size: 0.88rem;
  margin-bottom: 0.35rem;
  color: var(--text);
}

label.required::after {
  content: " *";
  color: var(--error);
}

.help-text {
  font-size: 0.8rem;
  color: var(--text-secondary);
  margin-bottom: 0.5rem;
}

input[type="text"], input[type="email"], input[type="number"],
input[type="password"], select, textarea {
  width: 100%;
  padding: 0.55rem 0.75rem;
  border: 1px solid var(--border);
  border-radius: 5px;
  font-size: 0.95rem;
  font-family: inherit;
  background: var(--card-bg);
  color: var(--text);
}

input:focus, select:focus, textarea:focus {
  outline: none;
  border-color: var(--navy);
  box-shadow: 0 0 0 2px rgba(30,58,95,0.15);
}

textarea { resize: vertical; min-height: 80px; }
input[type="file"] { font-size: 0.9rem; }

/* Interest grid */
.interest-grid { margin-top: 0.5rem; }

.interest-row {
  display: grid;
  grid-template-columns: 160px 1fr;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.75rem;
}

.interest-row .label { font-weight: 500; font-size: 0.9rem; }

.interest-options { display: flex; gap: 0.4rem; flex-wrap: wrap; }

.interest-options label {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  font-weight: 400;
  font-size: 0.82rem;
  padding: 0.3rem 0.6rem;
  border: 1px solid var(--border);
  border-radius: 4px;
  cursor: pointer;
  margin-bottom: 0;
  transition: background 0.15s, border-color 0.15s;
}

.interest-options input[type="radio"] { margin: 0; }

.interest-options label:has(input:checked) {
  background: var(--navy);
  color: var(--hero-text);
  border-color: var(--navy);
}

@media (max-width: 600px) {
  .interest-row { grid-template-columns: 1fr; }
}

/* ---- BUTTONS ---- */

.btn {
  display: inline-block;
  padding: 0.65rem 1.4rem;
  font-size: 0.88rem;
  font-weight: 500;
  border: none;
  border-radius: 5px;
  cursor: pointer;
  font-family: inherit;
  text-decoration: none;
  transition: background 0.15s;
}

.btn-primary { background: var(--navy); color: var(--hero-text); }
.btn-primary:hover { background: var(--navy-light); text-decoration: none; }
.btn-secondary { background: var(--sand); color: var(--text); border: 1px solid var(--border); }
.btn-secondary:hover { background: var(--border); text-decoration: none; }

/* ---- BADGES ---- */

.badge {
  display: inline-block;
  padding: 0.15rem 0.5rem;
  font-size: 0.75rem;
  border-radius: 3px;
  font-weight: 500;
}

.badge-high { background: var(--success-bg); color: var(--success); }
.badge-moderate { background: var(--warning-bg); color: #856404; }

/* ---- COHORT VIEW (faculty-facing) ---- */

.student-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 1.4rem;
  margin-bottom: 1rem;
}

.student-card h3 {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 0.3rem;
}

.student-card .meta {
  color: var(--text-secondary);
  font-size: 0.82rem;
  margin-bottom: 0.6rem;
}

.student-card .interests {
  margin-bottom: 0.6rem;
  display: flex;
  gap: 0.4rem;
  flex-wrap: wrap;
}

.student-card .description {
  font-size: 0.9rem;
  line-height: 1.55;
  margin-bottom: 0.6rem;
}

/* ---- FACULTY RESPONSE TRACKING ---- */

.response-section {
  border-top: 1px solid var(--border);
  margin-top: 0.8rem;
  padding-top: 0.8rem;
}

.response-display { margin-bottom: 0.6rem; }

.response-none, .response-unavailable {
  font-size: 0.85rem;
  color: var(--text-secondary);
  font-style: italic;
}

.response-list {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.response-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.6rem;
  font-size: 0.85rem;
}

.response-faculty {
  font-weight: 500;
  color: var(--text);
}

.response-status {
  padding: 0.12rem 0.5rem;
  border-radius: 3px;
  font-size: 0.75rem;
  font-weight: 500;
  white-space: nowrap;
}

.response-status--interested { background: var(--warning-bg); color: #856404; }
.response-status--offered { background: var(--success-bg); color: var(--success); }
.response-status--confirmed { background: var(--navy); color: var(--hero-text); }
.response-status--paperwork { background: #e8d5f5; color: #6b21a8; }
.response-status--program { background: #065f46; color: #ffffff; }
.response-status--default { background: var(--sand); color: var(--text-secondary); }

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .response-status--paperwork { background: #3b0764; color: #e8d5f5; }
  :root:not([data-theme="light"]) .response-status--program { background: #064e3b; color: #d1fae5; }
  :root:not([data-theme="light"]) .response-status--interested { color: #fbbf24; }
}
:root[data-theme="dark"] .response-status--paperwork { background: #3b0764; color: #e8d5f5; }
:root[data-theme="dark"] .response-status--program { background: #064e3b; color: #d1fae5; }
:root[data-theme="dark"] .response-status--interested { color: #fbbf24; }

.response-form-label {
  font-size: 0.82rem;
  font-weight: 500;
  margin-bottom: 0.4rem;
}

.response-form-row {
  display: flex;
  gap: 0.5rem;
  align-items: center;
  flex-wrap: wrap;
}

.response-select {
  flex: 1;
  min-width: 140px;
  padding: 0.4rem 0.6rem;
  font-size: 0.85rem;
  border: 1px solid var(--border);
  border-radius: 4px;
  background: var(--card-bg);
  color: var(--text);
  font-family: inherit;
}

.response-select:focus {
  outline: none;
  border-color: var(--navy);
  box-shadow: 0 0 0 2px rgba(30,58,95,0.15);
}

.response-submit {
  padding: 0.4rem 1rem;
  font-size: 0.82rem;
  white-space: nowrap;
}

.response-msg {
  font-size: 0.8rem;
  margin-top: 0.35rem;
  min-height: 1.2em;
}

.response-msg--ok { color: var(--success); }
.response-msg--err { color: var(--error); }

.draft-email-btn {
  margin-left: 0.5rem;
  padding: 0.25rem 0.7rem;
  font-size: 0.78rem;
  vertical-align: baseline;
  text-decoration: none;
}

.radio-label {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  margin-right: 1rem;
  cursor: pointer;
}

@media (max-width: 600px) {
  .response-form-row { flex-direction: column; }
  .response-select { min-width: 100%; }
  .response-item { flex-direction: column; align-items: flex-start; gap: 0.15rem; }
}

/* ---- THANKS ---- */

.thanks {
  text-align: center;
  padding: 4rem 2rem;
}

.thanks h1 {
  font-family: 'Roboto Slab', Georgia, serif;
  font-size: 1.8rem;
  color: var(--ink);
  margin-bottom: 1rem;
}

.thanks p {
  font-size: 1.05rem;
  color: var(--text-secondary);
  max-width: 500px;
  margin: 0 auto;
}

/* ---- FOOTER ---- */

.site-footer {
  text-align: center;
  padding: 2rem;
  font-size: 0.8rem;
  color: var(--text-secondary);
  border-top: 1px solid var(--border);
}

.site-footer a { color: var(--steel); }