/* ===================================================
   SOTAI — about.css
   About page styles. Inherits vars from main.css.
   =================================================== */

:root {
  --about-accent-l: #eef4ff;
  --about-accent-b: #c8ddf7;
}

[data-theme="dark"] {
  --about-accent-l: #1c2e58;
  --about-accent-b: #2a4478;
}

/* ===== PAGE ===== */
.about-page {
  max-width: 900px;
  margin: 0 auto;
  padding: 28px 20px 56px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

/* ===== HERO ===== */
.about-hero {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 36px 40px;
  box-shadow: var(--shadow);
  position: relative;
  overflow: hidden;
  transition: background .3s, border-color .3s;
}

.about-hero::before {
  content: '';
  position: absolute;
  right: -40px;
  top: -40px;
  width: 200px;
  height: 200px;
  border-radius: 50%;
  background: var(--about-accent-l);
  opacity: 0.7;
  pointer-events: none;
  transition: background .3s;
}

@media (max-width: 600px) {
  .about-hero { padding: 24px 20px; }
}

.about-eyebrow {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--accent);
  margin-bottom: 12px;
  transition: color .3s;
}

.about-eyebrow::before {
  content: '';
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
  flex-shrink: 0;
  transition: background .3s;
}

.about-h1 {
  font-size: 26px;
  font-weight: 900;
  color: var(--text-primary);
  letter-spacing: -0.4px;
  margin: 0 0 14px;
  position: relative;
  z-index: 1;
  line-height: 1.25;
  transition: color .3s;
}

.about-lead {
  font-size: 14.5px;
  color: var(--text-secondary);
  line-height: 1.7;
  max-width: 700px;
  position: relative;
  z-index: 1;
  transition: color .3s;
}

.about-lead strong {
  color: var(--accent);
  font-weight: 800;
  transition: color .3s;
}

/* ===== SECTION TITLE ===== */
.about-section-title {
  display: flex;
  align-items: center;
  gap: 10px;
}

.about-section-title::before {
  content: '';
  width: 3px;
  height: 22px;
  border-radius: 2px;
  background: var(--accent);
  flex-shrink: 0;
  transition: background .3s;
}

.about-section-title h2 {
  font-size: 17px;
  font-weight: 800;
  color: var(--text-primary);
  transition: color .3s;
}

/* ===== FEATURE CARDS ===== */
.about-features {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
}

@media (max-width: 680px) {
  .about-features { grid-template-columns: 1fr; }
}

.feat-card {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 20px;
  box-shadow: var(--shadow);
  transition: background .3s, border-color .3s, transform .15s, box-shadow .15s;
}

.feat-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-hover);
}

.feat-icon {
  width: 42px;
  height: 42px;
  border-radius: 12px;
  background: var(--about-accent-l);
  border: 1px solid var(--about-accent-b);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 12px;
  transition: all .3s;
}

.feat-icon svg {
  width: 20px;
  height: 20px;
  stroke: var(--accent);
  fill: none;
  transition: stroke .3s;
}

.feat-title {
  font-size: 13px;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 6px;
  transition: color .3s;
}

.feat-text {
  font-size: 12.5px;
  color: var(--text-muted);
  line-height: 1.6;
  transition: color .3s;
}

/* ===== THREE INTERFACES ===== */
.about-interfaces {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: background .3s, border-color .3s;
}

.about-interfaces__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding: 14px 20px 12px;
  border-bottom: 1px solid var(--border);
  position: relative;
  transition: border-color .3s;
}

.about-interfaces__head::before {
  content: '';
  position: absolute;
  left: 0;
  top: 10px;
  bottom: 10px;
  width: 3px;
  background: var(--accent);
  border-radius: 0 3px 3px 0;
  transition: background .3s;
}

.about-interfaces__head h3 {
  font-size: 14px;
  font-weight: 800;
  color: var(--text-primary);
  transition: color .3s;
}

.about-interfaces__hint {
  font-size: 11.5px;
  font-weight: 600;
  color: var(--text-muted);
  background: var(--bg-toolbar);
  padding: 3px 10px;
  border-radius: 999px;
  border: 1px solid var(--border);
  transition: all .3s;
}

.about-interfaces__list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
}

@media (max-width: 680px) {
  .about-interfaces__list { grid-template-columns: 1fr; }
}

.iface {
  padding: 18px 20px;
  border-right: 1px solid var(--border);
  transition: border-color .3s;
}

.iface:last-child { border-right: none; }

@media (max-width: 680px) {
  .iface { border-right: none; border-bottom: 1px solid var(--border); }
  .iface:last-child { border-bottom: none; }
}

.iface__label {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 11px;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent);
  margin-bottom: 8px;
  transition: color .3s;
}

.iface__dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
  flex-shrink: 0;
  transition: background .3s;
}

.iface__text {
  font-size: 12.5px;
  color: var(--text-muted);
  line-height: 1.55;
  transition: color .3s;
}

/* ===== CLOSING ===== */
.about-closing {
  background: var(--about-accent-l);
  border: 1px solid var(--about-accent-b);
  border-radius: 16px;
  padding: 24px 28px;
  transition: all .3s;
}

.about-closing p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.7;
  transition: color .3s;
}

.about-closing strong {
  color: var(--accent);
  font-weight: 800;
  transition: color .3s;
}