/* ============================================================
   Dải Lụa Thời Gian — Đồng hành / Sponsorship page
   ------------------------------------------------------------
   Page-specific layer. Loads AFTER:
     <link rel="stylesheet" href="/styles.css">
     <link rel="stylesheet" href="/dai-lua-thoi-gian/dltg-retrofit.css">
     <link rel="stylesheet" href="/dai-lua-thoi-gian/dong-hanh/dong-hanh.css">

   Reuses the silk design system (tokens, .section, .section__head,
   .eyebrow, .gold-rule, .btn, .lede, .hero scaffolding, .footer,
   .yws-footlights) and adds only the sponsor-deck components:
   reasons, reach stats, activation timeline, tiers, benefit table.
   ============================================================ */

/* ---- Hero (sponsorship framing) -------------------------------- */
.sp-hero__title {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(40px, 6.4vw, 84px);
  line-height: 1.04;
  color: var(--ink-deep);
  margin: 6px 0 0;
  letter-spacing: .005em;
}
.sp-hero__title .gold-shimmer { white-space: nowrap; }
.sp-hero__lead {
  max-width: 640px;
  margin: 22px auto 0;
  font-size: clamp(16px, 1.5vw, 18.5px);
  line-height: 1.7;
  color: var(--ink-soft);
}
.sp-hero .hero__meta-item strong { font-size: 17px; }

/* ---- Reasons to partner (deck slide 1) ------------------------- */
.sp-reasons {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: clamp(28px, 4vw, 56px) clamp(32px, 5vw, 64px);
}
.sp-reason {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 20px;
  align-items: start;
}
.sp-reason__num {
  font-family: var(--font-display);
  font-size: clamp(40px, 5vw, 56px);
  line-height: .9;
  color: var(--gold-light);
  font-weight: 600;
}
.sp-reason__title {
  font-family: var(--font-display);
  font-size: clamp(21px, 2vw, 25px);
  font-weight: 600;
  color: var(--ink-deep);
  margin: 4px 0 8px;
  line-height: 1.25;
}
.sp-reason__body {
  font-size: 15.5px;
  line-height: 1.65;
  color: var(--ink-soft);
}
.sp-reasons__pull {
  margin-top: clamp(40px, 5vw, 64px);
  text-align: center;
  font-family: var(--font-display);
  font-style: italic;
  font-size: clamp(19px, 2vw, 24px);
  color: var(--gold-deep);
  line-height: 1.5;
}

/* ---- Reach proof (deck slide 2) -------------------------------- */
.sp-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: clamp(20px, 3vw, 32px);
}
.sp-stat {
  position: relative;
  background: var(--paper);
  border: 1px solid rgba(184,137,58,.22);
  border-radius: 14px;
  overflow: hidden;
  box-shadow: 0 24px 60px -42px rgba(42,58,62,.5);
  transition: transform var(--t-fast), box-shadow var(--t-fast);
}
.sp-stat:hover {
  transform: translateY(-6px);
  box-shadow: 0 34px 70px -40px rgba(42,58,62,.55);
}
.sp-stat__photo {
  display: block;
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  filter: saturate(.92);
}
.sp-stat__body { padding: 22px 24px 26px; text-align: center; }
.sp-stat__num {
  font-family: var(--font-display);
  font-size: clamp(34px, 4vw, 46px);
  font-weight: 600;
  line-height: 1;
  background: linear-gradient(120deg, var(--jade-deep), var(--gold), var(--lotus-deep));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.sp-stat__label {
  margin-top: 10px;
  font-size: 15px;
  line-height: 1.55;
  color: var(--ink-soft);
}

/* ---- Activation timeline: before / during / after -------------- */
.sp-phases {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: clamp(20px, 3vw, 34px);
}
.sp-phase {
  background: var(--paper);
  border: 1px solid rgba(184,137,58,.2);
  border-radius: 16px;
  padding: 30px 28px 32px;
  position: relative;
}
.sp-phase::before {
  content: "";
  position: absolute;
  inset: 7px;
  border: 1px dashed rgba(184,137,58,.22);
  border-radius: 11px;
  pointer-events: none;
}
.sp-phase__kicker {
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 12.5px;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--gold-deep);
  margin-bottom: 16px;
}
.sp-phase--during .sp-phase__kicker { color: var(--jade-deep); }
.sp-phase--after  .sp-phase__kicker { color: var(--lotus-deep); }
.sp-phase__list { list-style: none; margin: 0; padding: 0; }
.sp-phase__list li {
  position: relative;
  padding: 0 0 11px 22px;
  font-size: 15px;
  line-height: 1.5;
  color: var(--ink);
}
.sp-phase__list li::before {
  content: "";
  position: absolute;
  left: 2px;
  top: .62em;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--gold-light);
}
.sp-phase--during .sp-phase__list li::before { background: var(--jade); }
.sp-phase--after  .sp-phase__list li::before { background: var(--lotus); }

/* special activation strip */
.sp-special {
  margin-top: clamp(40px, 5vw, 60px);
  text-align: center;
}
.sp-special__label {
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 12.5px;
  letter-spacing: .26em;
  text-transform: uppercase;
  color: var(--gold-deep);
}
.sp-special__line {
  margin: 14px auto 28px;
  max-width: 760px;
  font-family: var(--font-display);
  font-size: clamp(19px, 2.1vw, 24px);
  font-weight: 600;
  color: var(--plum);
  line-height: 1.4;
}
.sp-special__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: clamp(16px, 2.4vw, 26px);
}
.sp-special__card {
  border-radius: 14px;
  overflow: hidden;
  border: 1px solid rgba(184,137,58,.22);
  box-shadow: 0 24px 56px -42px rgba(42,58,62,.5);
}
.sp-special__card img {
  display: block;
  width: 100%;
  aspect-ratio: 1 / 1;
  object-fit: cover;
}

/* ---- Emotional branding block (deck slide 5) ------------------- */
.sp-emotion {
  display: grid;
  grid-template-columns: 1fr 1.15fr;
  gap: clamp(32px, 5vw, 72px);
  align-items: center;
}
.sp-emotion__art {
  border-radius: 18px;
  overflow: hidden;
  box-shadow: 0 30px 70px -44px rgba(42,58,62,.55);
}
.sp-emotion__art img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  aspect-ratio: 4 / 5;
}
.sp-emotion__eyebrow {
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 12.5px;
  letter-spacing: .26em;
  text-transform: uppercase;
  color: var(--gold-deep);
}
.sp-emotion__title {
  font-family: var(--font-display);
  font-size: clamp(28px, 3.4vw, 40px);
  font-weight: 600;
  color: var(--ink-deep);
  line-height: 1.15;
  margin: 14px 0 18px;
}
.sp-emotion__list { list-style: none; margin: 0 0 18px; padding: 0; }
.sp-emotion__list li {
  position: relative;
  padding: 0 0 10px 26px;
  font-size: 16px;
  line-height: 1.55;
  color: var(--ink);
}
.sp-emotion__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .55em;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: radial-gradient(circle at 35% 30%, var(--lotus-soft), var(--lotus-deep));
}
.sp-emotion__note {
  font-style: italic;
  color: var(--ink-soft);
  line-height: 1.6;
  margin-bottom: 14px;
}
.sp-emotion__quote {
  font-family: var(--font-display);
  font-style: italic;
  font-size: clamp(19px, 2vw, 23px);
  color: var(--gold-deep);
  line-height: 1.45;
}

/* ---- Sponsorship tiers (deck slide 9) -------------------------- */
.sp-tiers {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: clamp(18px, 2vw, 24px);
  align-items: stretch;
}
.sp-tier {
  position: relative;
  display: flex;
  flex-direction: column;
  padding: 34px 26px 30px;
  background: var(--paper);
  border: 1px solid rgba(184,137,58,.24);
  border-radius: 14px;
  transition: transform var(--t-fast), box-shadow var(--t-fast), border-color var(--t-fast);
}
.sp-tier:hover {
  transform: translateY(-6px);
  border-color: var(--gold);
  box-shadow: 0 30px 60px -32px rgba(184,137,58,.4);
}
.sp-tier--feature {
  background:
    radial-gradient(ellipse 80% 55% at 50% 0%, rgba(232,168,184,.2), transparent 70%),
    var(--paper);
  border-color: var(--gold-light);
}
.sp-tier__badge {
  position: absolute;
  top: -13px;
  left: 50%;
  transform: translateX(-50%);
  white-space: nowrap;
  padding: 5px 16px;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .22em;
  text-transform: uppercase;
  border-radius: 999px;
  background: var(--gold);
  color: #fff;
  box-shadow: 0 10px 22px -12px rgba(184,137,58,.7);
}
.sp-tier__name {
  font-family: var(--font-body);
  font-weight: 700;
  font-size: 13px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--plum);
}
.sp-tier--gold      .sp-tier__name { color: var(--gold-deep); }
.sp-tier--silver    .sp-tier__name { color: var(--jade-deep); }
.sp-tier--community .sp-tier__name { color: var(--ink); }
.sp-tier__price {
  font-family: var(--font-display);
  font-size: clamp(28px, 2.6vw, 34px);
  font-weight: 600;
  color: var(--ink-deep);
  margin: 12px 0 4px;
  line-height: 1;
}
.sp-tier__price small {
  display: block;
  font-family: var(--font-body);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: .04em;
  color: var(--ink-faint);
  margin-top: 6px;
}
.sp-tier__rule {
  height: 1px;
  margin: 18px 0;
  background: linear-gradient(90deg, transparent, rgba(184,137,58,.4), transparent);
}
.sp-tier__list { list-style: none; margin: 0; padding: 0; flex: 1; }
.sp-tier__list li {
  position: relative;
  padding: 0 0 10px 20px;
  font-size: 14px;
  line-height: 1.45;
  color: var(--ink);
}
.sp-tier__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .5em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--gold-light);
}
.sp-tier__cta { margin-top: 24px; }
.sp-tier__cta .btn { width: 100%; justify-content: center; }

/* ---- Benefit comparison table (deck slides 10–11) -------------- */
.sp-table-wrap {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  border: 1px solid rgba(184,137,58,.22);
  border-radius: 14px;
  background: var(--paper);
}
.sp-table {
  width: 100%;
  min-width: 760px;
  border-collapse: collapse;
  font-size: 14px;
}
.sp-table th,
.sp-table td {
  padding: 13px 16px;
  text-align: center;
  border-bottom: 1px solid rgba(184,137,58,.16);
  border-right: 1px solid rgba(184,137,58,.1);
}
.sp-table th:last-child,
.sp-table td:last-child { border-right: 0; }
.sp-table thead th {
  position: sticky;
  top: 0;
  font-family: var(--font-body);
  font-weight: 700;
  font-size: 12.5px;
  letter-spacing: .06em;
  text-transform: uppercase;
  background: var(--paper-soft);
  color: var(--ink-deep);
}
.sp-table thead th .price { display: block; font-weight: 500; font-size: 12px; color: var(--ink-soft); margin-top: 3px; letter-spacing: 0; }
.sp-table thead th.is-title    { background: rgba(232,168,184,.22); color: var(--plum); }
.sp-table thead th.is-gold     { background: rgba(212,175,110,.24); color: var(--gold-deep); }
.sp-table thead th.is-silver   { background: rgba(127,168,156,.22); color: var(--jade-deep); }
.sp-table tbody td:first-child,
.sp-table tbody th:first-child {
  text-align: left;
  font-weight: 500;
  color: var(--ink);
  background: rgba(251,246,233,.6);
}
.sp-table .sp-table__group td {
  text-align: center;
  font-family: var(--font-body);
  font-weight: 700;
  font-size: 12px;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--gold-deep);
  background: linear-gradient(90deg, rgba(212,175,110,.14), rgba(212,175,110,.06));
}
.sp-table .yes { color: var(--jade-deep); font-weight: 700; }
.sp-table .no  { color: var(--ink-faint); }
.sp-table .val { font-weight: 600; color: var(--ink-deep); }
.sp-table__note {
  margin-top: 14px;
  text-align: center;
  font-size: 13px;
  color: var(--ink-faint);
}

/* ---- Closing CTA (deck slides 12–13) --------------------------- */
.sp-close {
  text-align: center;
  max-width: 760px;
  margin: 0 auto;
}
.sp-close__lead {
  font-size: clamp(17px, 1.7vw, 20px);
  line-height: 1.7;
  color: var(--ink);
}
.sp-close__pull {
  margin: 28px 0 10px;
  font-family: var(--font-display);
  font-style: italic;
  font-weight: 600;
  font-size: clamp(21px, 2.4vw, 28px);
  color: var(--ink-deep);
  line-height: 1.4;
}
.sp-close__quote {
  font-family: var(--font-script);
  font-size: clamp(22px, 2.4vw, 30px);
  color: var(--lotus-deep);
  margin: 14px 0 32px;
}

/* Header back-link full/short swap + small-screen compaction now live in
   the shared /dai-lua-thoi-gian/dltg-retrofit.css (section 6), so the
   season page and this sponsor page behave identically. This page just
   provides the .nav__back-full / .nav__back-short spans in its markup. */

/* ---- Responsive ------------------------------------------------ */
@media (max-width: 980px) {
  .sp-tiers { grid-template-columns: repeat(2, 1fr); }
  .sp-emotion { grid-template-columns: 1fr; }
  .sp-emotion__art { max-width: 480px; margin: 0 auto; }
}
@media (max-width: 760px) {
  .sp-reasons { grid-template-columns: 1fr; }
  .sp-stats { grid-template-columns: 1fr; max-width: 420px; margin: 0 auto; }
  .sp-phases { grid-template-columns: 1fr; }
  .sp-special__grid { grid-template-columns: 1fr; max-width: 380px; margin: 0 auto; }
}
@media (max-width: 560px) {
  .sp-tiers { grid-template-columns: 1fr; max-width: 380px; margin: 0 auto; }
}