/* ===== โทเค็นดีไซน์ ===== */
:root {
  --ink: #16302b;
  --ink-soft: #2c4a43;
  --paper: #f6f1e7;
  --paper-card: #fffdf8;
  --amber: #e1a344;
  --amber-deep: #c78829;
  --rust: #b54834;
  --sage: #6b8f71;
  --line: rgba(22, 48, 43, 0.14);
  --radius: 3px;
  --font-display: "Kanit", sans-serif;
  --font-body: "Sarabun", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
}

a {
  color: inherit;
}

img {
  max-width: 100%;
  display: block;
}

.wrap {
  max-width: 1040px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ===== Top bar ===== */
.topbar {
  border-bottom: 1px solid var(--line);
  background: var(--paper);
  position: sticky;
  top: 0;
  z-index: 10;
}

.topbar .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}

.brand {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.15rem;
  text-decoration: none;
  color: var(--ink);
  display: flex;
  align-items: center;
  gap: 10px;
}

.brand .mark {
  width: 12px;
  height: 12px;
  background: var(--rust);
  display: inline-block;
}

.nav-links {
  display: flex;
  gap: 28px;
  font-size: 0.95rem;
}

.nav-links a {
  text-decoration: none;
  padding-bottom: 4px;
  border-bottom: 2px solid transparent;
}

.nav-links a:hover,
.nav-links a.active {
  border-bottom-color: var(--rust);
}

.btn {
  display: inline-block;
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.95rem;
  padding: 10px 20px;
  border-radius: var(--radius);
  border: 1px solid var(--ink);
  background: var(--ink);
  color: var(--paper);
  cursor: pointer;
  text-decoration: none;
  transition: transform 0.12s ease, background 0.12s ease;
}

.btn:hover {
  background: var(--ink-soft);
}

.btn:active {
  transform: scale(0.98);
}

.btn.secondary {
  background: transparent;
  color: var(--ink);
}

.btn.secondary:hover {
  background: rgba(22, 48, 43, 0.06);
}

/* ===== Hero (ค้นหาเป็นหัวใจของหน้าแรก) ===== */
.hero {
  padding: 56px 0 36px;
  border-bottom: 1px solid var(--line);
}

.hero h1 {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  line-height: 1.25;
  margin: 0 0 10px;
  max-width: 18ch;
}

.hero p.lede {
  max-width: 56ch;
  color: var(--ink-soft);
  margin: 0 0 28px;
  font-size: 1.05rem;
}

.search-row {
  display: flex;
  gap: 10px;
  max-width: 620px;
}

.search-row input[type="text"] {
  flex: 1;
  padding: 13px 16px;
  border: 1px solid var(--ink);
  border-radius: var(--radius);
  font-family: var(--font-body);
  font-size: 1rem;
  background: var(--paper-card);
  color: var(--ink);
}

.search-row input[type="text"]:focus {
  outline: 2px solid var(--amber);
  outline-offset: 1px;
}

.chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 18px;
}

.chip {
  font-size: 0.85rem;
  padding: 6px 14px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: transparent;
  cursor: pointer;
  color: var(--ink-soft);
}

.chip:hover {
  border-color: var(--ink);
}

.chip.active {
  background: var(--ink);
  color: var(--paper);
  border-color: var(--ink);
}

/* ===== Catalog list ===== */
.catalog {
  padding: 36px 0 80px;
}

.catalog-meta {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: 18px;
  color: var(--ink-soft);
  font-size: 0.9rem;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 16px;
}

.p-card {
  background: var(--paper-card);
  border: 1px solid var(--line);
  border-left: 4px solid var(--rust);
  border-radius: var(--radius);
  padding: 20px 22px;
  text-decoration: none;
  color: var(--ink);
  display: flex;
  flex-direction: column;
  gap: 10px;
  transition: border-color 0.12s ease;
}

.p-card[data-cat="IoT/ฮาร์ดแวร์"] { border-left-color: var(--sage); }
.p-card[data-cat="ปัญญาประดิษฐ์/ML"] { border-left-color: var(--amber-deep); }
.p-card[data-cat="เกม"] { border-left-color: #7a5ea8; }
.p-card[data-cat="งานวิจัย/วิทยานิพนธ์"] { border-left-color: #3f6b8f; }

.p-card:hover {
  border-left-width: 6px;
}

.p-card .cat-label {
  font-size: 0.78rem;
  color: var(--ink-soft);
  letter-spacing: 0.01em;
}

.p-card h3 {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 1.15rem;
  margin: 0;
  line-height: 1.35;
}

.p-card .summary {
  font-size: 0.92rem;
  color: var(--ink-soft);
  flex: 1;
}

.p-card .meta {
  font-size: 0.82rem;
  color: var(--ink-soft);
  display: flex;
  justify-content: space-between;
  border-top: 1px dashed var(--line);
  padding-top: 10px;
  margin-top: 4px;
}

.empty-state {
  padding: 60px 20px;
  text-align: center;
  color: var(--ink-soft);
  border: 1px dashed var(--line);
  border-radius: var(--radius);
}

.empty-state a {
  color: var(--rust);
  font-weight: 600;
}

/* ===== Detail page ===== */
.detail {
  padding: 44px 0 80px;
}

.back-link {
  display: inline-block;
  margin-bottom: 24px;
  font-size: 0.9rem;
  text-decoration: none;
  color: var(--ink-soft);
}

.back-link:hover {
  color: var(--ink);
}

.detail .cat-label {
  color: var(--rust);
  font-weight: 600;
  font-size: 0.9rem;
}

.detail h1 {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(1.6rem, 3.6vw, 2.2rem);
  margin: 8px 0 16px;
}

.detail .summary {
  font-size: 1.05rem;
  color: var(--ink-soft);
  max-width: 62ch;
  margin-bottom: 24px;
}

.detail .details-body {
  max-width: 68ch;
  white-space: pre-wrap;
  margin-bottom: 32px;
}

.tech-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 28px;
}

.tech-tag {
  font-size: 0.82rem;
  padding: 5px 12px;
  background: rgba(107, 143, 113, 0.14);
  border: 1px solid rgba(107, 143, 113, 0.4);
  border-radius: 999px;
  color: var(--sage);
  font-weight: 600;
}

.info-panel {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 20px 24px;
  background: var(--paper-card);
  max-width: 420px;
  display: grid;
  gap: 12px;
}

.info-row {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  font-size: 0.92rem;
  border-bottom: 1px dashed var(--line);
  padding-bottom: 10px;
}

.info-row:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.info-row .label {
  color: var(--ink-soft);
}

.link-row {
  display: flex;
  gap: 10px;
  margin-top: 20px;
  flex-wrap: wrap;
}

/* ===== Form (submit page) ===== */
.form-page {
  padding: 44px 0 80px;
}

.form-page h1 {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(1.6rem, 3.6vw, 2.2rem);
  margin: 0 0 8px;
}

.form-page p.lede {
  color: var(--ink-soft);
  max-width: 60ch;
  margin-bottom: 32px;
}

form.project-form {
  max-width: 640px;
  display: grid;
  gap: 20px;
}

.field {
  display: grid;
  gap: 6px;
}

.field label {
  font-weight: 600;
  font-size: 0.92rem;
}

.field .hint {
  font-size: 0.8rem;
  color: var(--ink-soft);
  font-weight: 400;
}

.field input,
.field textarea,
.field select {
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  font-family: var(--font-body);
  font-size: 0.98rem;
  background: var(--paper-card);
  color: var(--ink);
}

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

.field textarea {
  resize: vertical;
  min-height: 110px;
}

.two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

@media (max-width: 560px) {
  .two-col {
    grid-template-columns: 1fr;
  }
  .nav-links {
    display: none;
  }
}

.form-msg {
  padding: 12px 16px;
  border-radius: var(--radius);
  font-size: 0.92rem;
  display: none;
}

.form-msg.show {
  display: block;
}

.form-msg.error {
  background: rgba(181, 72, 52, 0.1);
  color: var(--rust);
  border: 1px solid rgba(181, 72, 52, 0.3);
}

.form-msg.success {
  background: rgba(107, 143, 113, 0.14);
  color: var(--sage);
  border: 1px solid rgba(107, 143, 113, 0.4);
}

footer {
  border-top: 1px solid var(--line);
  padding: 24px 0;
  font-size: 0.85rem;
  color: var(--ink-soft);
}

/* ===== Admin ===== */
.admin-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
  gap: 16px;
}

.admin-row .t {
  font-weight: 600;
}

.admin-row .del-btn {
  background: transparent;
  border: 1px solid var(--rust);
  color: var(--rust);
  padding: 6px 14px;
  border-radius: var(--radius);
  cursor: pointer;
  font-family: var(--font-body);
  font-size: 0.85rem;
}

.admin-row .del-btn:hover {
  background: rgba(181, 72, 52, 0.08);
}