/* ============================================================
   presentation page — long-scroll
   ============================================================ */

/* ---------- hero ---------- */
.pres-hero {
  background:
    radial-gradient(1100px 500px at 50% -10%, rgba(165,190,0,.14), transparent 60%),
    linear-gradient(175deg, var(--deep) 0%, #0B3120 60%, var(--forest) 100%);
  color: #fff;
  text-align: center;
  padding: 72px 24px 84px;
}
.hero-logo {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 30px;
  margin: 0 auto 30px;
}
.hero-icon { height: 88px; width: auto; display: block; }
.hero-wordmark { width: 190px; height: auto; display: block; }

.pres-hero h1 { font-size: 46px; font-weight: 700; letter-spacing: .5px; }
.hero-sub { font-size: 19px; color: var(--lime); font-weight: 500; margin-top: 6px; }
.hero-desc {
  max-width: 620px;
  margin: 18px auto 0;
  color: #C9D6CC;
  font-size: 15px;
  line-height: 2;
}
.hero-ctas { display: flex; gap: 12px; justify-content: center; margin-top: 30px; flex-wrap: wrap; }
.hero-ctas .btn { font-size: 15px; padding: 12px 26px; }
.btn-ghost {
  background: transparent;
  border-color: rgba(255,255,255,.35);
  color: #fff;
}
.btn-ghost:hover { background: rgba(255,255,255,.1); border-color: rgba(255,255,255,.55); }

/* ---------- sections ---------- */
.pres-section { padding: 68px 24px; }
.pres-section.alt { background: var(--mint); }
.section-inner { max-width: 1080px; margin: 0 auto; }
.section-inner.narrow { max-width: 760px; }

.kicker {
  display: inline-block;
  font-size: 12.5px;
  font-weight: 700;
  color: var(--lime-dark);
  background: rgba(165,190,0,.14);
  border: 1px solid rgba(165,190,0,.35);
  border-radius: 99px;
  padding: 3px 14px;
  margin-bottom: 10px;
}
.pres-section h2 { font-size: 28px; color: var(--deep); line-height: 1.5; margin-bottom: 14px; }
.section-head { text-align: center; margin-bottom: 36px; }
.section-lead { color: var(--ink-2); font-size: 15px; max-width: 560px; margin: 0 auto; }

/* split layout (photo + text) */
.split {
  display: grid;
  grid-template-columns: 380px 1fr;
  gap: 48px;
  align-items: center;
}
.split.reverse { grid-template-columns: 1fr 380px; }
.split.reverse .split-figure { order: 2; }
.split.reverse .split-text { order: 1; }

.split-figure { margin: 0; }
.split-figure img {
  width: 100%;
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  aspect-ratio: 4 / 4.7;
  object-fit: cover;
  object-position: center;
}
#vision .split-figure img { object-position: center 72%; }
#qassim .split-figure img { object-position: center 30%; }
.split-figure figcaption {
  font-size: 12px;
  color: var(--ink-2);
  text-align: center;
  margin-top: 10px;
  line-height: 1.8;
}
.split-text p { margin-bottom: 14px; font-size: 15px; line-height: 2.05; color: var(--ink); }
.split-text strong { color: var(--forest); }
.soft-note {
  background: #fff;
  border: 1px solid var(--line);
  border-inline-start: 4px solid var(--lime);
  border-radius: var(--radius-sm);
  padding: 14px 18px;
  font-size: 14px !important;
  color: var(--ink-2) !important;
}

/* ---------- method cards ---------- */
.method-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}
.method-card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 22px 20px 18px;
  position: relative;
}
.m-step {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px; height: 34px;
  border-radius: 10px;
  background: var(--deep);
  color: var(--lime);
  font-weight: 700;
  font-size: 16px;
  margin-bottom: 10px;
}
.method-card h3 { font-size: 15.5px; color: var(--deep); margin-bottom: 6px; }
.method-card p { font-size: 13px; color: var(--ink-2); line-height: 1.9; }

/* formula */
.formula-box {
  margin: 34px auto 0;
  max-width: 720px;
  background: var(--deep);
  color: #fff;
  border-radius: var(--radius);
  padding: 24px 28px;
  text-align: center;
  box-shadow: var(--shadow-lg);
}
.formula-label { font-size: 13px; color: var(--lime); font-weight: 700; margin-bottom: 8px; }
.formula { font-size: 21px; font-weight: 700; letter-spacing: .3px; }
.formula-note { font-size: 12px; color: #A9BCAE; margin-top: 10px; line-height: 1.9; }

.validation-box {
  margin: 26px auto 0;
  max-width: 720px;
  background: var(--mint);
  border: 1px solid var(--mint-deep);
  border-radius: var(--radius);
  padding: 20px 26px;
}
.validation-box h3 { font-size: 15px; color: var(--forest); margin-bottom: 8px; }
.validation-box p { font-size: 13.5px; line-height: 2; color: var(--ink-2); margin: 0; }
.validation-box a { color: var(--forest); font-weight: 700; text-decoration: underline; }

/* sources */
.sources-title { font-size: 18px; color: var(--deep); margin: 44px 0 14px; text-align: center; }
.sources-wrap { overflow-x: auto; border-radius: var(--radius); border: 1px solid var(--line); box-shadow: var(--shadow); background: #fff; }
.sources-table { width: 100%; font-size: 13px; min-width: 640px; }
.sources-table th {
  background: var(--mint);
  color: var(--forest);
  text-align: start;
  font-size: 12.5px;
  padding: 10px 16px;
  border-bottom: 1px solid var(--line);
  white-space: nowrap;
}
.sources-table td { padding: 10px 16px; border-bottom: 1px solid #EEF2EE; vertical-align: top; line-height: 1.8; }
.sources-table tr:last-child td { border-bottom: none; }
.sources-table a { color: var(--forest); font-weight: 500; text-decoration-color: var(--lime); }
.sources-table a:hover { color: var(--lime-dark); }

/* ---------- study cards ---------- */
.study-cards {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  max-width: 860px;
  margin: 0 auto;
}
.study-card { padding: 28px 26px; text-align: center; }
.study-card[dir="ltr"] { text-align: center; }
.study-flag {
  width: 48px; height: 48px;
  margin: 0 auto 12px;
  border-radius: 14px;
  background: var(--deep);
  color: var(--lime);
  font-weight: 700;
  font-size: 19px;
  display: flex; align-items: center; justify-content: center;
}
.study-card h3 { font-size: 17px; color: var(--deep); margin-bottom: 6px; }
.study-card p { font-size: 13px; color: var(--ink-2); min-height: 44px; line-height: 1.8; }
.study-btns { display: flex; gap: 10px; justify-content: center; margin-top: 16px; flex-wrap: wrap; }

/* ---------- about ---------- */
#about p { font-size: 15px; line-height: 2.05; margin-bottom: 14px; }
.notice-box {
  background: var(--mint);
  border: 1px solid var(--mint-deep);
  border-inline-start: 4px solid var(--lime);
  border-radius: var(--radius-sm);
  padding: 16px 20px;
  font-size: 13.5px;
  color: var(--ink-2);
  line-height: 2;
  margin-top: 22px;
}
.notice-box strong { color: var(--forest); }

/* ============================================================
   responsive
   ============================================================ */
@media (max-width: 1024px) {
  .split { grid-template-columns: 320px 1fr; gap: 32px; }
  .split.reverse { grid-template-columns: 1fr 320px; }
  .method-grid { grid-template-columns: repeat(2, 1fr); }
  .pres-hero h1 { font-size: 38px; }
}

@media (max-width: 640px) {
  .pres-hero { padding: 48px 18px 56px; }
  .hero-logo { gap: 18px; margin-bottom: 22px; }
  .hero-icon { height: 60px; }
  .hero-wordmark { width: 130px; }
  .pres-hero h1 { font-size: 31px; }
  .hero-sub { font-size: 16px; }
  .pres-section { padding: 46px 16px; }
  .pres-section h2 { font-size: 22px; }

  .split, .split.reverse { grid-template-columns: 1fr; gap: 22px; }
  .split.reverse .split-figure { order: 0; }
  .split.reverse .split-text { order: 1; }
  .split-figure { max-width: 340px; margin: 0 auto; }

  .method-grid { grid-template-columns: 1fr; }
  .formula { font-size: 16px; }
  .study-cards { grid-template-columns: 1fr; }
}