/* ═══════════════════════════════════════════════════════════
   Yi Zhou, Ph.D. — SFSU Finance  |  styles.css
   Framework: Tailwind CSS (via CDN) + custom overrides
   ═══════════════════════════════════════════════════════════ */

/* ── CSS Custom Properties (Design Tokens) ── */
:root {
  --navy:       #1a3a5c;
  --navy-dark:  #0d2440;
  --navy-mid:   #1e4570;
  --gold:       #b8860b;
  --gold-light: #1a3a5c;
  --cream:      #1a2a3a;
  --ink:        #0d2440;
  --muted:      #4a6a8a;
  --border:     rgba(26,58,92,0.2);
  --glass:      rgba(26,58,92,0.04);
}

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

body {
  font-family: 'Book Antiqua', 'Palatino Linotype', Palatino, Georgia, serif;
  background: #ffffff;
  color: var(--cream);
  min-height: 100vh;
  font-size: 18px;
  line-height: 1.7;
}

/* ── Header & Nav ── */
header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  padding: 20px 48px;
  border-bottom: 1px solid var(--border);
  background: rgba(13,36,64,0.97);
  position: sticky;
  top: 0;
  z-index: 100;
}

.site-title {
  font-family: 'Book Antiqua', 'Palatino Linotype', Palatino, Georgia, serif;
  font-size: 20px;
  letter-spacing: 2px;
  color: #b8860b;
  text-transform: uppercase;
  font-weight: bold;
}

nav {
  display: flex;
  gap: 4px;
  flex-wrap: wrap;
}

nav button {
  background: transparent;
  border: 1px solid transparent;
  color: #eef4fb;
  padding: 9px 20px;
  font-family: 'Book Antiqua', 'Palatino Linotype', Palatino, Georgia, serif;
  font-size: 18px;
  letter-spacing: 1px;
  cursor: pointer;
  transition: all 0.2s;
  text-transform: uppercase;
}

nav button:hover { border-color: rgba(184,134,11,0.4); color: #b8860b; }
nav button.active { border-color: #b8860b; color: #b8860b; background: rgba(184,134,11,0.08); }

/* ── Main & Pages ── */
main { min-height: calc(100vh - 64px); }

.page { display: none; padding: 64px 48px; max-width: 960px; margin: 0 auto; animation: fadeUp 0.5s ease both; }
.page.active { display: block; }

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(20px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ── Typography ── */
h1 {
  font-size: clamp(32px, 5vw, 60px);
  font-weight: 600;
  color: var(--gold-light);
  line-height: 1.1;
  margin-bottom: 8px;
}

h2 {
  font-family: 'Book Antiqua', 'Palatino Linotype', Palatino, Georgia, serif;
  font-size: 15.6px;
  letter-spacing: 4px;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: 40px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border);
}

h3 { font-size: 28.6px; color: var(--gold-light); margin-bottom: 8px; font-weight: 600; }
p  { color: var(--cream); margin-bottom: 18px; }
a  { color: var(--gold); text-decoration: none; }
a:hover { text-decoration: underline; }
img { max-width: 100%; display: block; }

/* ── Page Painting Backgrounds ── */
#page-bio {
  position: relative;
}
#page-bio::before {
  content: '';
  position: fixed;
  inset: 0;
  background: url('Mona-Lisa-oil-wood-panel-Leonardo-da.jpg') center center / cover no-repeat;
  opacity: 0.20;
  pointer-events: none;
  z-index: 0;
}
#page-bio > * { position: relative; z-index: 1; }

#page-publications {
  position: relative;
}
#page-publications::before {
  content: '';
  position: fixed;
  inset: 0;
  background: url('Lady-Ermine-oil-panel-Leonardo-da-Vinci.jpg') center center / cover no-repeat;
  opacity: 0.20;
  pointer-events: none;
  z-index: 0;
}
#page-publications > * { position: relative; z-index: 1; }

#page-awards {
  position: relative;
}
#page-awards::before {
  content: '';
  position: fixed;
  inset: 0;
  background: url('Screenshot.png') center center / cover no-repeat;
  opacity: 0.20;
  pointer-events: none;
  z-index: 0;
}
#page-awards > * { position: relative; z-index: 1; }

#page-service {
  position: relative;
}
#page-service::before {
  content: '';
  position: fixed;
  inset: 0;
  background: url('Ginevra-de-Benci-oil-panel-Leonardo-da.jpg') center center / cover no-repeat;
  opacity: 0.20;
  pointer-events: none;
  z-index: 0;
}
#page-service > * { position: relative; z-index: 1; }

#page-markets {
  position: relative;
}
#page-markets::before {
  content: '';
  position: fixed;
  inset: 0;
  background: url('The-Virgin-of-the-Rocks-Leonardo-da-Vinci-circa-1483-1494.jpg') center center / cover no-repeat;
  opacity: 0.20;
  pointer-events: none;
  z-index: 0;
}
#page-markets > * { position: relative; z-index: 1; }

#page-contact {
  position: relative;
}
#page-contact::before {
  content: '';
  position: fixed;
  inset: 0;
  background: url('Screenshot.png') center center / cover no-repeat;
  opacity: 0.20;
  pointer-events: none;
  z-index: 0;
}
#page-contact > * { position: relative; z-index: 1; }

/* Each active page sets the page's own background color */
.page.active {
  background: white;
  min-height: 100vh;
}

/* ── Biography Page ── */
.bio-hero {
  display: flex;
  gap: 48px;
  align-items: flex-start;
  margin-bottom: 56px;
  flex-wrap: wrap;
}

.bio-photo {
  width: 200px;
  height: 200px;
  object-fit: cover;
  border: 2px solid var(--gold);
  flex-shrink: 0;
  box-shadow: 8px 8px 0 var(--gold);
}

.bio-intro h1 { margin-bottom: 4px; font-size: clamp(32px, 4.7vw, 54px); font-weight: 700; }
.bio-intro p { margin-bottom: 1em; }
.bio-intro .role {
  font-family: 'Palatino Linotype', 'Book Antiqua', Palatino, Georgia, serif;
  font-size: 20px;
  color: var(--gold);
  letter-spacing: 2px;
  margin-bottom: 16px;
}

.credential-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
  margin-top: 40px;
}

.credential-card {
  background: var(--glass);
  border: 1px solid var(--border);
  padding: 20px;
}

.credential-card .label {
  font-family: 'Book Antiqua', 'Palatino Linotype', Palatino, Georgia, serif;
  font-size: 11px;
  letter-spacing: 3px;
  color: var(--gold);
  text-transform: uppercase;
  margin-bottom: 6px;
}

/* ── Publications Page ── */
.pub-list { list-style: none; }

.pub-item {
  border-bottom: 1px solid var(--border);
  padding: 28px 0;
}

.pub-item .journal {
  font-family: 'Book Antiqua', 'Palatino Linotype', Palatino, Georgia, serif;
  font-size: 24px;
  font-weight: 600;
  color: var(--gold);
  margin-bottom: 8px;
}

.pub-item .title {
  font-size: 20px;
  font-weight: 600;
  color: var(--cream);
  margin-bottom: 4px;
  line-height: 1.3;
}

.pub-item .authors {
  font-size: 15px;
  color: var(--muted);
  font-style: italic;
}

.pub-title-link {
  color: var(--cream);
  text-decoration: none;
  transition: color 0.2s;
}

.pub-title-link:hover {
  color: var(--gold);
  text-decoration: underline;
}

.pub-item .year {
  font-family: 'DM Mono', monospace;
  font-size: 12px;
  color: var(--gold);
  float: right;
}

/* ── Awards Page ── */
.awards-list { display: flex; flex-direction: column; gap: 0; }

.award-item {
  display: flex;
  gap: 32px;
  align-items: flex-start;
  padding: 28px 0;
  border-bottom: 1px solid var(--border);
}

.award-year {
  font-family: 'Book Antiqua', 'Palatino Linotype', Palatino, Georgia, serif;
  font-size: 22px;
  color: var(--gold);
  min-width: 100px;
  padding-top: 4px;
}

.award-body h3 { font-size: 19px; margin-bottom: 4px; }
.award-body p  { font-size: 16px; color: var(--muted); margin: 0; }

/* ── Service Page ── */
.service-section { margin-bottom: 48px; }
.service-section h3 { margin-bottom: 16px; }

.service-table { width: 100%; border-collapse: collapse; }

.service-table th {
  font-family: 'Book Antiqua', 'Palatino Linotype', Palatino, Georgia, serif;
  font-size: 12px;
  letter-spacing: 2px;
  color: var(--gold);
  text-transform: uppercase;
  text-align: left;
  padding: 10px 16px;
  border-bottom: 1px solid var(--gold);
}

.service-table td {
  padding: 14px 16px;
  border-bottom: 1px solid var(--border);
  font-size: 16px;
  vertical-align: top;
}

.service-table tr:hover td { background: var(--glass); }

/* ── Contact Page ── */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  margin-bottom: 48px;
}

.contact-block .label {
  font-family: 'Book Antiqua', 'Palatino Linotype', Palatino, Georgia, serif;
  font-size: 12px;
  letter-spacing: 3px;
  color: var(--gold);
  text-transform: uppercase;
  margin-bottom: 8px;
}

.contact-block p { font-size: 20px; margin: 0; }

.contact-form { margin-top: 48px; }
.contact-form h3 { margin-bottom: 24px; font-size: 20px; }

.form-group { margin-bottom: 20px; }

.form-group label {
  display: block;
  font-family: 'Book Antiqua', 'Palatino Linotype', Palatino, Georgia, serif;
  font-size: 12px;
  letter-spacing: 2px;
  color: var(--gold);
  text-transform: uppercase;
  margin-bottom: 8px;
}

.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  background: var(--glass);
  border: 1px solid var(--border);
  color: var(--cream);
  padding: 12px 16px;
  font-family: 'Book Antiqua', 'Palatino Linotype', Palatino, Georgia, serif;
  font-size: 17px;
  outline: none;
  transition: border-color 0.2s;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus { border-color: var(--gold); }

.form-group input:invalid:not(:placeholder-shown) { border-color: #e05; }

.form-group textarea { min-height: 140px; resize: vertical; }
.form-group select option { background: var(--navy); }

.submit-btn {
  background: var(--gold);
  color: var(--navy-dark);
  border: none;
  padding: 14px 36px;
  font-family: 'Book Antiqua', 'Palatino Linotype', Palatino, Georgia, serif;
  font-size: 14px;
  letter-spacing: 2px;
  text-transform: uppercase;
  cursor: pointer;
  transition: background 0.2s;
}

.submit-btn:hover { background: var(--gold-light); }

.form-success {
  display: none;
  background: rgba(245,230,163,0.1);
  border: 1px solid var(--gold);
  padding: 20px 24px;
  margin-top: 20px;
  font-family: 'Book Antiqua', 'Palatino Linotype', Palatino, Georgia, serif;
  font-size: 14px;
  color: var(--gold);
}

.form-error {
  font-family: 'Book Antiqua', 'Palatino Linotype', Palatino, Georgia, serif;
  font-size: 13px;
  color: #e05;
  margin-top: 4px;
  display: none;
}

/* ── Markets Page ── */
.market-block { margin-bottom: 16px; }

.market-block-title {
  font-size: 22px;
  color: var(--gold-light);
  margin-bottom: 6px;
  font-weight: 600;
}

.market-block-sub {
  font-size: 14px;
  color: var(--muted);
  margin-bottom: 24px;
  font-style: italic;
}

.market-source {
  font-family: 'DM Mono', monospace;
  font-size: 11px;
  color: var(--muted);
  letter-spacing: 1px;
  margin-top: 16px;
}

/* Quote cards grid */
.quotes-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 16px;
}

.quote-card {
  background: var(--glass);
  border: 1px solid var(--border);
  padding: 20px 16px;
  transition: border-color 0.2s;
}

.quote-card:hover { border-color: var(--gold); }

.quote-card.skeleton { opacity: 0.4; }

.quote-ticker {
  font-family: 'DM Mono', monospace;
  font-size: 18px;
  font-weight: bold;
  color: var(--gold);
  letter-spacing: 2px;
  margin-bottom: 4px;
}

.quote-label {
  font-size: 12px;
  color: var(--muted);
  margin-bottom: 12px;
  letter-spacing: 0.5px;
}

.quote-price {
  font-family: 'DM Mono', monospace;
  font-size: 22px;
  color: var(--gold-light);
  font-weight: bold;
  margin-bottom: 4px;
}

.quote-change {
  font-family: 'DM Mono', monospace;
  font-size: 13px;
}

/* Spinner (reused from old modal — now on Markets page) */
.modal-loading {
  text-align: center;
  padding: 40px 0;
  font-family: 'Book Antiqua', 'Palatino Linotype', Palatino, Georgia, serif;
  font-size: 14px;
  color: var(--muted);
}

.spinner {
  width: 32px; height: 32px;
  border: 2px solid var(--border);
  border-top-color: var(--gold);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  margin: 0 auto 16px;
}

@keyframes spin { to { transform: rotate(360deg); } }

/* ── Art Market Section ── */
.art-market-block {
  margin-top: 48px;
  padding-top: 40px;
  border-top: 1px solid var(--border);
}

.auction-tabs {
  display: flex;
  gap: 8px;
  margin-bottom: 24px;
  flex-wrap: wrap;
}

.auction-tab-btn {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--muted);
  padding: 8px 20px;
  font-family: 'Book Antiqua', 'Palatino Linotype', Palatino, Georgia, serif;
  font-size: 13px;
  letter-spacing: 1px;
  cursor: pointer;
  transition: all 0.2s;
  text-transform: uppercase;
}

.auction-tab-btn:hover { border-color: var(--gold); color: var(--gold); }
.auction-tab-btn.active { border-color: var(--gold); color: var(--gold); background: rgba(245,230,163,0.08); }

.auction-house-section { display: none; }
.auction-house-section.active { display: block; }

.auction-filters {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 20px;
}

.auction-filter-chip {
  background: var(--glass);
  border: 1px solid var(--border);
  color: var(--muted);
  padding: 5px 14px;
  font-family: 'DM Mono', monospace;
  font-size: 11px;
  letter-spacing: 1px;
  cursor: pointer;
  transition: all 0.2s;
  border-radius: 0;
}

.auction-filter-chip:hover { border-color: var(--gold); color: var(--gold); }
.auction-filter-chip.active { border-color: var(--gold); color: var(--gold); background: rgba(245,230,163,0.1); }

.auction-iframe-wrap {
  position: relative;
  width: 100%;
  height: 600px;
  border: 1px solid var(--border);
  background: rgba(255,255,255,0.02);
  overflow: hidden;
}

.auction-iframe-wrap iframe {
  width: 100%;
  height: 100%;
  border: none;
  filter: none;
}

.auction-link-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: 16px;
  background: transparent;
  border: 1px solid var(--gold);
  color: var(--gold);
  padding: 10px 24px;
  font-family: 'Book Antiqua', 'Palatino Linotype', Palatino, Georgia, serif;
  font-size: 13px;
  letter-spacing: 2px;
  text-transform: uppercase;
  text-decoration: none;
  transition: background 0.2s;
  cursor: pointer;
}

.auction-link-btn:hover {
  background: rgba(245,230,163,0.1);
  text-decoration: none;
}

.auction-note {
  font-family: 'DM Mono', monospace;
  font-size: 11px;
  color: var(--muted);
  letter-spacing: 1px;
  margin-top: 12px;
  font-style: normal;
}

/* ── Visitor Guestbook ── */
.guestbook-section {
  margin-top: 64px;
  padding-top: 48px;
  border-top: 1px solid var(--border);
}

.guestbook-section h3 { margin-bottom: 8px; font-size: 22px; }

.guestbook-subtitle {
  font-size: 14px;
  color: var(--muted);
  margin-bottom: 32px;
  font-style: italic;
}

.guestbook-form { margin-bottom: 24px; }

.guestbook-entries { display: flex; flex-direction: column; gap: 0; margin-top: 24px; }

.guestbook-entry {
  padding: 20px 0;
  border-bottom: 1px solid var(--border);
  animation: fadeUp 0.4s ease both;
}

.entry-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 6px;
  gap: 12px;
  flex-wrap: wrap;
}

.entry-name {
  font-family: 'Book Antiqua', 'Palatino Linotype', Palatino, Georgia, serif;
  font-size: 13px;
  letter-spacing: 2px;
  color: var(--gold);
  text-transform: uppercase;
}

.entry-date {
  font-family: 'DM Mono', monospace;
  font-size: 11px;
  color: var(--muted);
  flex: 1;
}

.entry-message {
  font-size: 16px;
  color: var(--cream);
  line-height: 1.7;
  margin: 0;
}

.guestbook-loading {
  color: var(--muted);
  font-size: 14px;
  font-style: italic;
  padding: 16px 0;
}

/* Delete button (mod mode only) */
.gb-delete-btn {
  background: rgba(220,38,38,0.15);
  border: 1px solid rgba(220,38,38,0.4);
  color: #f87171;
  font-family: 'DM Mono', monospace;
  font-size: 11px;
  letter-spacing: 1px;
  padding: 4px 10px;
  cursor: pointer;
  transition: background 0.2s;
}
.gb-delete-btn:hover { background: rgba(220,38,38,0.3); }

/* Mod bar */
.mod-bar {
  margin-top: 16px;
  margin-bottom: 8px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.mod-toggle-btn {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--muted);
  font-family: 'DM Mono', monospace;
  font-size: 11px;
  letter-spacing: 1px;
  padding: 6px 14px;
  cursor: pointer;
  align-self: flex-start;
  transition: border-color 0.2s, color 0.2s;
}
.mod-toggle-btn:hover { border-color: var(--gold); color: var(--gold); }

.mod-login {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.mod-login input[type="password"] {
  background: var(--glass);
  border: 1px solid var(--border);
  color: var(--cream);
  padding: 8px 12px;
  font-family: 'DM Mono', monospace;
  font-size: 13px;
  outline: none;
  width: 200px;
  transition: border-color 0.2s;
}
.mod-login input[type="password"]:focus { border-color: var(--gold); }

.mod-error {
  font-family: 'DM Mono', monospace;
  font-size: 12px;
  color: #f87171;
}

.mod-active {
  display: flex;
  align-items: center;
  gap: 14px;
}

.mod-badge {
  font-family: 'DM Mono', monospace;
  font-size: 12px;
  letter-spacing: 1px;
  color: #4ade80;
  background: rgba(74,222,128,0.1);
  border: 1px solid rgba(74,222,128,0.3);
  padding: 4px 12px;
}

.mod-exit-btn {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--muted);
  font-family: 'DM Mono', monospace;
  font-size: 11px;
  padding: 4px 12px;
  cursor: pointer;
  transition: color 0.2s;
}
.mod-exit-btn:hover { color: var(--gold); border-color: var(--gold); }

/* ── Footer ── */
footer {
  text-align: center;
  padding: 32px;
  background: rgba(13,36,64,0.97);
  border-top: 1px solid rgba(184,134,11,0.25);
  font-family: 'DM Mono', monospace;
  font-size: 11px;
  color: #a8c4e0;
  letter-spacing: 2px;
}

/* ── Responsive ── */
@media (max-width: 700px) {
  header { padding: 16px 20px; }
  .page { padding: 40px 20px; }
  .bio-hero { flex-direction: column; }
  .bio-photo { width: 160px; height: 160px; }
  .contact-grid { grid-template-columns: 1fr; }
  .award-item { flex-direction: column; gap: 8px; }
  .ticker-strip { display: none; }
}