:root {
  color-scheme: light;
  --bg: #fdfcfb;
  --bg-alt: #f6f3ee;
  --surface: #ffffff;
  --ink: #111111;
  --muted: #555555;
  --line: #dcd6cd;
  --accent: #0000ee;
  --accent-hover: #0000cc;

  /* Semantic status colors (bg/ink pairs each meet WCAG AA) */
  --danger-bg: #fdf2f0;
  --danger-ink: #8f2d1e;
  --danger-border: #f0bdb5;

  --success-bg: #eef7f0;
  --success-ink: #235c30;
  --success-border: #a8d5b5;

  --warning-bg: #fff8e6;
  --warning-ink: #7a5200;
  --warning-border: #e0a800;

  /* Badges */
  --badge-bg: var(--bg-alt);
  --badge-ink: var(--muted);
  --badge-line: var(--line);

  /* Typography */
  --serif: Georgia, "Times New Roman", serif;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
}

/* Single dark-mode override: follows the OS/browser preference (no JS toggle). */
@media (prefers-color-scheme: dark) {
  :root {
    color-scheme: dark;
    --bg: #161514;
    --bg-alt: #22201d;
    --surface: #1e1c1a;
    --ink: #ece7e0;
    --muted: #a0988e;
    --line: #38332d;
    --accent: #6699ff;
    --accent-hover: #88b3ff;

    --danger-bg: #2d1815;
    --danger-ink: #f08b7d;
    --danger-border: #6d332a;

    --success-bg: #132a1c;
    --success-ink: #7dd492;
    --success-border: #2c593b;

    --warning-bg: #2a2210;
    --warning-ink: #f0c35e;
    --warning-border: #6d5420;

    --badge-bg: #262420;
    --badge-ink: #ece7e0;
    --badge-line: #38332d;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 16px/1.65 var(--sans);
  padding: 40px 20px 80px;
}

main {
  max-width: 660px;
  margin: 0 auto;
}

/* ---------- typography ---------- */
h1, h2, h3, h4 {
  font-family: var(--serif);
  font-weight: normal;
  line-height: 1.25;
  color: var(--ink);
}

h1 { font-size: 2rem; margin: 24px 0 12px; }
h2 { font-size: 1.4rem; margin: 32px 0 10px; border-bottom: 1px solid var(--line); padding-bottom: 4px; }
h3 { font-size: 1.15rem; margin: 24px 0 8px; }

p { margin: 14px 0; }

a,
a:visited {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 2px;
}

a:hover {
  color: var(--accent-hover);
}

a:active {
  color: var(--accent);
}

ul, ol {
  margin: 14px 0;
  padding-left: 24px;
}

li {
  margin: 6px 0;
}

blockquote {
  margin: 18px 0;
  padding: 8px 16px;
  border-left: 3px solid var(--line);
  color: var(--muted);
}

code {
  font-family: var(--mono);
  font-size: 0.9em;
  background: var(--surface);
  padding: 1px 4px;
  border: 1px solid var(--line);
  border-radius: 3px;
}

pre {
  overflow-x: auto;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 4px;
  padding: 12px 14px;
  font-size: 13.5px;
  margin: 16px 0;
}

pre code {
  background: none;
  padding: 0;
  border: none;
}

hr {
  border: none;
  border-top: 1px solid var(--line);
  margin: 32px 0;
}

.crumb {
  font-size: 14px;
  color: var(--muted);
  margin: 0 0 16px;
}

.meta {
  font-size: 14px;
  color: var(--muted);
}

.lede {
  color: var(--muted);
  font-size: 1.05rem;
  margin: 12px 0 24px;
}

/* ---------- tables ---------- */
table, .data-table {
  width: 100%;
  border-collapse: collapse;
  margin: 20px 0;
  font-size: 14px;
}

th, td {
  border: 1px solid var(--line);
  padding: 6px 10px;
  text-align: left;
  vertical-align: top;
}

th {
  background: var(--surface);
  font-weight: 600;
  color: var(--muted);
}

/* ---------- forms & controls ---------- */
form { margin: 16px 0; }
.form-group { margin-bottom: 16px; }
.form-group label { display: block; font-size: 14px; margin-bottom: 4px; font-weight: 500; }
.form-group .help-text { font-size: 13px; color: var(--muted); margin-top: 3px; }
.form-group.checkbox { display: flex; align-items: center; gap: 8px; }
.form-group.checkbox label { margin-bottom: 0; font-weight: normal; }

input[type="text"],
input[type="password"],
input[type="email"],
input[type="number"],
input[type="date"],
input[type="search"],
.input-field,
textarea,
select {
  width: 100%;
  padding: 7px 10px;
  background: var(--surface);
  color: var(--ink);
  border: 1px solid var(--line);
  border-radius: 4px;
  font: 14.5px/1.5 var(--sans);
}

select {
  background-color: var(--surface);
  color: var(--ink);
}

select option,
select optgroup {
  background-color: var(--surface);
  color: var(--ink);
}

textarea {
  min-height: 160px;
  resize: vertical;
  font-family: var(--mono);
  font-size: 13.5px;
}

input:focus,
textarea:focus,
select:focus,
.input-field:focus {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
  border-color: var(--accent);
}

.form-group .help-text.error,
.help-text-error {
  color: var(--danger-ink);
}

.btn, button, input[type="submit"] {
  display: inline-block;
  background: var(--surface);
  color: var(--ink);
  border: 1px solid var(--line);
  border-radius: 4px;
  padding: 5px 12px;
  font: 14px var(--sans);
  text-decoration: none;
  cursor: pointer;
}

.btn:hover, button:hover, input[type="submit"]:hover {
  border-color: var(--ink);
  color: var(--ink);
}

.btn:focus, button:focus, input[type="submit"]:focus {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

button:disabled, .btn:disabled, input[type="submit"]:disabled {
  opacity: 0.4;
  cursor: not-allowed;
  border-color: var(--line);
}

.btn-primary, input[type="submit"].btn-primary {
  background: var(--surface);
  color: var(--ink);
  border: 2px solid var(--ink);
  font-weight: 600;
}

.btn-primary:hover, input[type="submit"].btn-primary:hover {
  background: var(--ink);
  color: var(--bg);
  border-color: var(--ink);
}

.btn-primary a,
.btn-primary:visited {
  color: inherit;
  text-decoration: none;
}

.btn-danger {
  background: var(--danger-bg);
  color: var(--danger-ink);
  border: 1px solid var(--danger-border);
  font-weight: 600;
}

.btn-danger:hover {
  /* Stay within the AA-verified danger ink/background pair in both
     light and dark mode; the hover cue is the border and inset ring. */
  background: var(--danger-bg);
  color: var(--danger-ink);
  border-color: var(--danger-ink);
  box-shadow: inset 0 0 0 1px var(--danger-ink);
}

.btn-small {
  padding: 2px 7px;
  font-size: 13px;
}

.action-bar {
  display: flex;
  gap: 10px;
  align-items: center;
  margin: 16px 0;
  flex-wrap: wrap;
}

/* ---------- flash messages ---------- */
.flash-messages { margin: 16px 0; }
.flash {
  padding: 8px 12px;
  border-radius: 4px;
  margin-bottom: 8px;
  font-size: 14px;
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--ink);
}
.flash.error {
  border-color: var(--danger-border);
  background: var(--danger-bg);
  color: var(--danger-ink);
}
.flash.success {
  border-color: var(--success-border);
  background: var(--success-bg);
  color: var(--success-ink);
}
.flash.info {
  border-color: var(--line);
  background: var(--surface);
  color: var(--ink);
}

/* ---------- prose ---------- */
.prose { overflow-wrap: anywhere; line-height: 1.65; }
.prose h1 { font-size: 1.6rem; margin: 24px 0 12px; }
.prose h2 { font-size: 1.3rem; margin: 28px 0 10px; }
.prose h3 { font-size: 1.1rem; margin: 20px 0 8px; }
.prose p { margin: 12px 0; }
.prose ul, .prose ol { margin: 10px 0 14px 22px; padding-left: 0; }
.prose li { margin: 4px 0; }

/* ---------- Public CV ---------- */
.cv-page {
  width: min(100%, 860px);
  margin: 0 auto;
}

.cv-header {
  position: relative;
  padding-top: 0;
}

.cv-home {
  margin: 0 0 10px;
  font-size: 14px;
}

.cv-header h1 {
  margin: 0;
  border: 0;
  padding: 0;
  font-size: clamp(1.35rem, 2.5vw, 1.7rem);
}

.cv-page .cv-actions {
  margin: 14px 0 16px;
}

.cv-page .cv-actions .sep {
  margin: 0 6px;
  color: var(--muted);
}

.cv-page .cv-viewer-container {
  width: 100%;
  height: min(82vh, 1100px);
  min-height: 500px;
  margin: 0 0 24px;
  border: 1px solid var(--line);
  background: var(--surface);
  border-radius: 4px;
  overflow: hidden;
}

.cv-page .cv-pdf-embed,
.cv-page .cv-pdf-frame {
  width: 100%;
  height: 100%;
  border: none;
  display: block;
}

.cv-page .cv-fallback {
  padding: 32px 16px;
  text-align: center;
  color: var(--muted);
}

@media (max-width: 600px) {
  .cv-page .cv-viewer-container {
    height: 72vh;
    min-height: 420px;
  }
}

@media (prefers-color-scheme: dark) {
  body:has(.cv-page) {
    background: #111;
    color: #eee;
  }

  body:has(.cv-page) a,
  body:has(.cv-page) a:visited {
    color: #7da7ff;
  }

  body:has(.cv-page) a:hover,
  body:has(.cv-page) a:focus {
    color: #b8ceff;
  }

  body:has(.cv-page) .cv-viewer-container {
    border-color: #666;
    background: #1b1b1b;
  }
}

/* ---------- Internship Application Tracker ---------- */
@media (min-width: 960px) {
  main.tracker-main,
  main:has(.tracker-view) {
    max-width: 920px;
  }
}

.tracker-meta-bar {
  margin: 12px 0 24px;
}

.tracker-section {
  margin: 32px 0;
}

.tracker-section h2 {
  font-size: 1.25rem;
  margin: 28px 0 10px;
  padding-bottom: 4px;
  border-bottom: 1px solid var(--line);
}

.tracker-list {
  display: flex;
  flex-direction: column;
}

.tracker-item {
  padding: 12px 0;
  border-bottom: 1px solid var(--line);
}

.tracker-item:last-child {
  border-bottom: none;
}

.tracker-item-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 4px;
}

.tracker-item-title {
  font-size: 1.05rem;
  font-weight: 600;
  line-height: 1.35;
}

.tracker-item-title a {
  color: var(--accent);
}

.tracker-item-actions {
  font-size: 13px;
  color: var(--muted);
  white-space: nowrap;
}

.tracker-item-actions a {
  color: var(--muted);
}

.tracker-item-actions a:hover {
  color: var(--accent);
}

.tracker-item-details {
  font-size: 14px;
  line-height: 1.55;
  color: var(--muted);
}

.tracker-field {
  margin: 2px 0;
  overflow-wrap: break-word;
}

/* Public homepage: restrained retro document layout. */
.home-page {
  display: grid;
  gap: clamp(2rem, 5vw, 4rem);
}

.home-page .home-header { padding-top: 0.5rem; }
.home-page .home-header h1 {
  font-size: clamp(2rem, 4vw, 3.2rem);
  margin: 0;
}

.home-page .home-columns {
  display: grid;
  grid-template-columns: minmax(10rem, 0.28fr) minmax(0, 1fr);
  gap: clamp(1.25rem, 4vw, 3rem);
  align-items: stretch;
}

.home-page .useful-links {
  border-right: 1px solid #888;
  padding-right: clamp(0.8rem, 2.4vw, 1.5rem);
}

.home-page .useful-links h2 {
  display: inline-block;
  font-size: 1.1rem;
  margin: 0 0 1rem;
  border: 0;
  padding-bottom: 0;
}

.home-page .useful-links ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.home-page .useful-links li { margin: 0 0 0.65rem; }
.home-page .home-copy { max-width: 62ch; }
.home-page .home-copy p:first-child { margin-top: 0; }
.home-page .home-copy p:last-child { margin-bottom: 0; }

.home-page hr {
  border: 0;
  border-top: 1px solid #888;
  margin: 0;
}

.home-page .skyline-wrap {
  width: 100%;
  margin-top: clamp(1.75rem, 3vw, 2.5rem);
  text-align: center;
}

.home-page .retro-skyline {
  display: block;
  width: min(100%, 850px);
  height: auto;
  margin-inline: auto;
  image-rendering: pixelated;
}

@media (max-width: 700px) {
  .home-page .home-columns {
    grid-template-columns: 1fr;
    gap: 1.75rem;
  }

  .home-page .useful-links {
    border-right: 0;
    border-bottom: 0;
    padding: 0;
  }

  .home-page .useful-links ul {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem 1.25rem;
  }

  .home-page .useful-links li { margin: 0; }
}

@media (max-width: 430px) {
  body:has(.home-page) { padding-left: 0.9rem; padding-right: 0.9rem; }
  .home-page .useful-links ul { flex-direction: column; gap: 0.5rem; }
}

body:has(.home-page) {
  background: #fff;
  color: #000;
  font-family: Georgia, "Times New Roman", Times, serif;
  font-size: clamp(1rem, 0.96rem + 0.18vw, 1.12rem);
  padding: clamp(1.25rem, 3vw, 3rem) clamp(1rem, 4vw, 2rem) 4rem;
}

body:has(.home-page) main { max-width: 1120px; }

@media (prefers-color-scheme: dark) {
  body:has(.home-page) {
    background: #111;
    color: #eee;
  }

  body:has(.home-page) a,
  body:has(.home-page) a:visited {
    color: #7da7ff;
  }

  body:has(.home-page) a:hover,
  body:has(.home-page) a:focus {
    color: #b8ceff;
  }

  body:has(.home-page) .home-page hr,
  body:has(.home-page) .home-page .useful-links {
    border-color: #666;
  }

  body:has(.home-page) .home-page .retro-skyline {
    filter: invert(1);
  }
}