/* =========================================================
   Personal Homepage — HW8
   Design concept: "Entity Card" system — portfolio & CV items
   are styled like database table/entity cards (a nod to the
   ER-Modeling coursework this site's owner is studying).
   ========================================================= */

@import url('https://fonts.googleapis.com/css2?family=Prompt:wght@500;600;700&family=Sarabun:wght@300;400;500;600;700&family=JetBrains+Mono:wght@400;500&display=swap');

:root{
  /* --- Color tokens --- */
  --bg:            #F5F6F8;
  --surface:       #FFFFFF;
  --surface-alt:   #EEF1F4;
  --border:        #E1E5EA;
  --text:          #1B2430;
  --text-muted:    #6B7480;
  --primary:       #2F6F5E;   /* deep teal — "primary key" */
  --primary-dark:  #234F43;
  --accent:        #B65C34;   /* warm rust — "foreign key" */
  --accent-soft:   #F3E7DE;
  --focus:         #2F6F5E;

  /* --- Type tokens --- */
  --font-display: 'Prompt', 'Sarabun', sans-serif;
  --font-body:    'Sarabun', sans-serif;
  --font-mono:    'JetBrains Mono', monospace;

  --radius: 10px;
  --radius-sm: 6px;
  --shadow-card: 0 1px 2px rgba(27,36,48,0.04), 0 4px 14px rgba(27,36,48,0.05);
}

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

html{ scroll-behavior: smooth; }

body{
  margin:0;
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  font-size: 16px;
}

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

a{ color: var(--primary); text-decoration:none; }
a:hover{ color: var(--primary-dark); }

h1,h2,h3,h4{
  font-family: var(--font-display);
  color: var(--text);
  line-height: 1.25;
  margin: 0 0 .5em;
}

h1{ font-size: clamp(1.9rem, 3vw, 2.6rem); font-weight:700; }
h2{ font-size: clamp(1.4rem, 2.2vw, 1.9rem); font-weight:600; }
h3{ font-size: 1.15rem; font-weight:600; }

p{ margin:0 0 1em; color: var(--text); }

.container{
  width:100%;
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 24px;
}

/* Visible focus ring everywhere (accessibility) */
a:focus-visible, button:focus-visible, input:focus-visible, textarea:focus-visible{
  outline: 3px solid var(--focus);
  outline-offset: 2px;
  border-radius: 4px;
}

/* ---------------- Course bar ---------------- */
.course-bar{
  background: var(--surface-alt);
  border-bottom: 1px solid var(--border);
  font-family: var(--font-mono);
  font-size: .78rem;
  color: var(--text-muted);
  letter-spacing: .02em;
}
.course-bar .container{ padding-top:8px; padding-bottom:8px; }

/* ---------------- Header / Nav ---------------- */
.site-header{
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top:0;
  z-index: 50;
}
.nav-wrap{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap: 16px;
  padding: 16px 24px;
}
.brand{
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 1rem;
  color: var(--text);
  letter-spacing: .02em;
}
.brand em{
  font-style: normal;
  color: var(--primary);
}
.brand::before{
  content: "";
  display:inline-block;
  width:8px; height:8px;
  border-radius: 2px;
  background: var(--accent);
  margin-inline-end: 8px;
  vertical-align: middle;
}
.nav{
  display:flex;
  flex-wrap: wrap;
  gap: 4px;
}
.nav a{
  color: var(--text-muted);
  font-weight: 500;
  font-size: .95rem;
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  transition: background .15s ease, color .15s ease;
}
.nav a:hover{ background: var(--surface-alt); color: var(--text); }
.nav a[aria-current="page"]{
  color: var(--primary);
  background: var(--accent-soft);
}

/* ---------------- Hero ---------------- */
.hero{
  padding: 72px 0 56px;
  border-bottom: 1px solid var(--border);
}
.hero-grid{
  display:grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 48px;
  align-items:center;
}
@media (max-width: 780px){
  .hero-grid{ grid-template-columns: 1fr; }
}
.eyebrow{
  font-family: var(--font-mono);
  font-size: .8rem;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: .08em;
  margin-bottom: 12px;
  display:block;
}
.hero p.lead{
  font-size: 1.1rem;
  color: var(--text-muted);
  max-width: 46ch;
}
.hero-photo{
  border-radius: var(--radius);
  overflow:hidden;
  border: 1px solid var(--border);
  background: var(--surface);
  box-shadow: var(--shadow-card);
}

.btn-row{ display:flex; gap:12px; flex-wrap:wrap; margin-top: 24px; }
.btn{
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding: 11px 20px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: .95rem;
  border: 1px solid transparent;
  cursor:pointer;
  font-family: var(--font-body);
}
.btn-primary{ background: var(--primary); color:#fff; }
.btn-primary:hover{ background: var(--primary-dark); color:#fff; }
.btn-ghost{ background: transparent; border-color: var(--border); color: var(--text); }
.btn-ghost:hover{ background: var(--surface-alt); color: var(--text); }
.btn-sm{ padding: 7px 14px; font-size: .85rem; }

/* ---------------- Section shell ---------------- */
.section{ padding: 56px 0; }
.section-head{ margin-bottom: 32px; max-width: 60ch; }
.section-head .eyebrow{ margin-bottom: 8px; }
.section-alt{ background: var(--surface); }

/* ---------------- Entity cards (signature element) ----------------
   Styled like a database table: a header bar that reads like a
   table name, and rows that read like attributes.
-------------------------------------------------------------------*/
.entity-grid{
  display:grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
}
.entity-card{
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow:hidden;
  box-shadow: var(--shadow-card);
  display:flex;
  flex-direction:column;
}
.entity-card__head{
  background: var(--primary);
  color:#fff;
  padding: 12px 16px;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:8px;
}
.entity-card__table{
  font-family: var(--font-mono);
  font-size: .78rem;
  letter-spacing: .03em;
  opacity: .85;
  text-transform: uppercase;
}
.entity-card__body{
  padding: 18px 16px 20px;
  flex:1;
  display:flex;
  flex-direction:column;
}
.entity-card__body h3{ margin-bottom:6px; }
.entity-card__body p{
  color: var(--text-muted);
  font-size: .93rem;
  flex:1;
}
.pill{
  font-family: var(--font-mono);
  font-size: .68rem;
  padding: 2px 8px;
  border-radius: 999px;
  background: rgba(255,255,255,.18);
  color:#fff;
  white-space:nowrap;
}
.tag-row{ display:flex; gap:6px; flex-wrap:wrap; margin: 10px 0 16px; }
.tag{
  font-size: .74rem;
  font-family: var(--font-mono);
  color: var(--accent);
  background: var(--accent-soft);
  padding: 3px 9px;
  border-radius: 999px;
}
.card-actions{ display:flex; gap:8px; margin-top:auto; }

/* ---------------- CV page ---------------- */
.cv-header{
  display:flex;
  gap:24px;
  align-items:center;
  flex-wrap:wrap;
  padding-bottom: 32px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 32px;
}
.cv-photo{
  width: 120px; height:120px;
  border-radius: 50%;
  overflow:hidden;
  border: 3px solid var(--surface);
  outline: 1px solid var(--border);
  flex-shrink:0;
}
.cv-photo img{ width:100%; height:100%; object-fit:cover; }
.cv-contact-list{ list-style:none; padding:0; margin: 8px 0 0; font-size:.92rem; color: var(--text-muted); }
.cv-contact-list li{ margin-bottom:4px; }

.timeline{ border-inline-start: 2px solid var(--border); padding-inline-start: 24px; }
.timeline-item{ position:relative; margin-bottom: 28px; }
.timeline-item::before{
  content:"";
  position:absolute;
  left: -30px;
  top: 4px;
  width:10px; height:10px;
  background: var(--accent);
  border-radius:50%;
}
.timeline-item .meta{
  font-family: var(--font-mono);
  font-size: .78rem;
  color: var(--text-muted);
}

/* ---------------- Skill chips ---------------- */
.skill-group{ margin-bottom: 22px; }
.skill-group h4{
  font-family: var(--font-mono);
  font-size: .72rem;
  text-transform: uppercase;
  letter-spacing: .06em;
  color: var(--text-muted);
  margin: 0 0 10px;
}
.skill-chip-grid{
  display:flex;
  flex-wrap:wrap;
  gap: 10px;
}
.skill-chip{
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding: 9px 14px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 999px;
  font-size: .88rem;
  font-weight: 500;
  color: var(--text);
  box-shadow: var(--shadow-card);
}
.skill-chip::before{
  content:"";
  width:7px; height:7px;
  border-radius:50%;
  background: var(--primary);
  flex-shrink:0;
}
.skill-chip.accent::before{ background: var(--accent); }

/* ---------------- Contact form ---------------- */
.form-grid{
  display:grid;
  gap: 18px;
  max-width: 560px;
}
.field label{
  display:block;
  font-size: .88rem;
  font-weight:600;
  margin-bottom: 6px;
}
.field input, .field textarea{
  width:100%;
  padding: 11px 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-family: var(--font-body);
  font-size: .95rem;
  background: var(--surface);
  color: var(--text);
}
.field textarea{ resize: vertical; min-height: 130px; }
.field .hint{ font-size:.78rem; color:var(--text-muted); margin-top:4px; }
.contact-info{
  display:flex;
  flex-direction:column;
  gap:14px;
}
.contact-info .item{
  display:flex;
  gap:12px;
  align-items:flex-start;
  padding: 14px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}
.contact-info .item strong{ display:block; font-size:.85rem; color: var(--text-muted); font-weight:600; }

/* ---------------- Footer ---------------- */
.site-footer{
  border-top: 1px solid var(--border);
  padding: 28px 0;
  text-align:center;
  color: var(--text-muted);
  font-size: .85rem;
  background: var(--surface);
}
.site-footer .eyebrow{ display:block; margin-bottom:4px; }

/* ---------------- Detail pages ---------------- */
.detail-meta{
  display:flex;
  flex-wrap:wrap;
  gap: 10px;
  margin-bottom: 24px;
}
.detail-body img{
  border-radius: var(--radius);
  border: 1px solid var(--border);
  margin: 20px 0;
}
.back-link{
  display:inline-flex;
  align-items:center;
  gap:6px;
  font-size:.9rem;
  margin-bottom: 20px;
  font-weight:600;
}

/* ---------------- Utility ---------------- */
.grid-2{ display:grid; grid-template-columns: 1fr 1fr; gap: 32px; }
@media (max-width: 780px){ .grid-2{ grid-template-columns: 1fr; } }
.muted{ color: var(--text-muted); }