/* ===========================================================
   Sakura App Studio — shared App Detail page styles
   Generic layout (prefix .ad-) reused by every app detail page,
   themed via a body class:
     .theme-anb      → AnswerNotebook AI (light Sakura)
     .theme-korean   → Korean Journey (Hanok-night navy + taegeuk)
     .theme-nihongo  → Nihongo Journey (indigo night + crimson/sakura)
   Reuses styles.css primitives (.container, .btn, .nav, .footer,
   typography, .reveal). Does not affect index/legal/helixia pages.
   =========================================================== */

.ad-page { background: var(--ad-bg); color: var(--ad-text); min-height: 100vh; }
.ad-page a { color: inherit; }
.ad-grad-text {
  background: var(--ad-grad);
  -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent;
}

/* ---------- Nav ---------- */
.ad-page .nav-links-static { display: flex; align-items: center; gap: 26px; }
.ad-page .nav-links-static a { font-weight: 600; font-size: 15px; color: var(--ad-nav-link); transition: color .2s; }
.ad-page .nav-links-static a:hover { color: var(--ad-accent); }

/* ---------- Buttons ---------- */
.ad-page .btn-primary { background: var(--ad-grad); color: var(--ad-btn-text); box-shadow: var(--ad-btn-shadow); }
.ad-page .btn-primary:hover { transform: translateY(-2px); box-shadow: var(--ad-btn-shadow-hover); }
.ad-page .btn-ghost { background: var(--ad-ghost-bg); color: var(--ad-accent); border: 1.5px solid var(--ad-border); box-shadow: none; }
.ad-page .btn-ghost:hover { transform: translateY(-2px); border-color: var(--ad-accent); }

/* ---------- Pill ---------- */
.ad-page .pill { background: var(--ad-chip-bg); border: 1px solid var(--ad-border); color: var(--ad-accent); }

/* ---------- Hero ---------- */
.ad-hero { padding: 148px 0 40px; text-align: center; position: relative; }
.ad-icon {
  width: 104px; height: 104px; border-radius: 26px; margin: 0 auto 22px;
  border: 1px solid var(--ad-border); box-shadow: var(--ad-icon-shadow); object-fit: cover;
}
.ad-icon-emoji { display: grid; place-items: center; font-size: 54px; background: var(--ad-chip-bg); }
.ad-title { font-size: clamp(40px, 7vw, 66px); font-weight: 800; letter-spacing: -1.6px; margin: 14px 0 8px; }
.ad-tagline { color: var(--ad-accent); font-weight: 700; font-size: clamp(15px, 1.9vw, 20px); margin-bottom: 14px; }
.ad-lead { color: var(--ad-muted); max-width: 720px; margin: 0 auto 26px; font-size: clamp(15px, 1.6vw, 17px); }
.ad-actions { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }
.ad-meta-row { display: flex; gap: 10px; flex-wrap: wrap; justify-content: center; margin-top: 22px; font-size: 13px; }
.ad-meta-row span { background: var(--ad-surface); border: 1px solid var(--ad-border); border-radius: 999px; padding: 6px 14px; color: var(--ad-muted); }

/* ---------- Section scaffolding ---------- */
.ad-section { padding: 56px 0; }
.ad-section-alt { background: var(--ad-alt); }
.ad-section-head { text-align: center; max-width: 740px; margin: 0 auto 40px; }
.ad-eyebrow { display: inline-block; text-transform: uppercase; letter-spacing: 2px; font-size: 12px; font-weight: 800; color: var(--ad-accent); margin-bottom: 10px; }
.ad-section-head h2 { font-size: clamp(26px, 3.4vw, 38px); font-weight: 800; letter-spacing: -0.8px; margin-bottom: 10px; }
.ad-section-head p { color: var(--ad-muted); font-size: 16px; }

/* ---------- Stats / highlights ---------- */
.ad-stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; max-width: 960px; margin: 0 auto; }
.ad-stat { background: var(--ad-surface); border: 1px solid var(--ad-border); border-radius: 18px; padding: 24px 18px; text-align: center; }
.ad-stat strong { display: block; font-size: 24px; font-weight: 800; letter-spacing: -0.5px; background: var(--ad-grad); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; }
.ad-stat span { color: var(--ad-muted); font-size: 13.5px; }
.ad-highlights { display: flex; flex-wrap: wrap; gap: 12px; justify-content: center; max-width: 900px; margin: 26px auto 0; padding: 0; }
.ad-highlights li { list-style: none; background: var(--ad-surface); border: 1px solid var(--ad-border); border-radius: 999px; padding: 9px 16px; font-size: 13.5px; font-weight: 600; color: var(--ad-text); }

/* ---------- Prose card ---------- */
.ad-card { background: var(--ad-surface); border: 1px solid var(--ad-border); border-radius: 22px; padding: 36px 38px; max-width: 860px; margin: 0 auto; }
.ad-card p { color: var(--ad-muted); margin-bottom: 14px; font-size: 16px; }
.ad-card p:last-child { margin-bottom: 0; }
.ad-card strong { color: var(--ad-text); }

/* ---------- Feature grid ---------- */
.ad-feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.ad-feature { background: var(--ad-surface); border: 1px solid var(--ad-border); border-radius: 20px; padding: 26px 22px; transition: transform .3s cubic-bezier(.21,.6,.35,1), box-shadow .3s ease, border-color .3s ease; }
.ad-feature:hover { transform: translateY(-6px); border-color: var(--ad-accent); box-shadow: var(--ad-feature-shadow); }
.ad-ficon { width: 48px; height: 48px; border-radius: 14px; display: grid; place-items: center; font-size: 24px; margin-bottom: 14px; background: var(--ad-chip-bg); border: 1px solid var(--ad-border); }
.ad-feature h3 { font-size: 18px; font-weight: 800; margin-bottom: 8px; color: var(--ad-text); }
.ad-feature > p { color: var(--ad-muted); font-size: 14.5px; margin: 0; }
.ad-taglist { list-style: none; margin: 12px 0 0; padding: 0; display: flex; flex-wrap: wrap; gap: 7px; }
.ad-taglist li { font-size: 12px; font-weight: 600; color: var(--ad-accent); background: var(--ad-chip-bg); border: 1px solid var(--ad-border); border-radius: 999px; padding: 4px 10px; }

/* ---------- Steps ---------- */
.ad-steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; max-width: 900px; margin: 0 auto; }
.ad-step { background: var(--ad-surface); border: 1px solid var(--ad-border); border-radius: 20px; padding: 26px 22px; text-align: center; }
.ad-step-num { width: 40px; height: 40px; border-radius: 50%; display: grid; place-items: center; margin: 0 auto 14px; font-weight: 800; color: var(--ad-btn-text); background: var(--ad-grad); }
.ad-step h3 { font-size: 17px; font-weight: 800; margin-bottom: 6px; color: var(--ad-text); }
.ad-step p { color: var(--ad-muted); font-size: 14px; }

/* ---------- Who it's for ---------- */
.ad-chips { display: flex; flex-wrap: wrap; gap: 10px; justify-content: center; max-width: 860px; margin: 0 auto; }
.ad-chip { background: var(--ad-surface); border: 1px solid var(--ad-border); color: var(--ad-text); border-radius: 999px; padding: 9px 16px; font-size: 14px; font-weight: 600; }

/* ---------- Screenshot gallery ---------- */
.ad-gallery { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; max-width: 980px; margin: 0 auto; }
.ad-shot { aspect-ratio: 9 / 16; border-radius: 22px; overflow: hidden; border: 1px solid var(--ad-border); background: var(--ad-shot-bg); display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 8px; text-align: center; padding: 20px; }
.ad-shot img { width: 100%; height: 100%; object-fit: cover; }
.ad-shot-label { font-weight: 700; color: var(--ad-text); font-size: 15px; }
.ad-shot-note { font-size: 12px; color: var(--ad-muted); }

/* ---------- Links ---------- */
.ad-links { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; max-width: 900px; margin: 0 auto; }
.ad-link { background: var(--ad-surface); border: 1px solid var(--ad-border); border-radius: 16px; padding: 20px 16px; text-align: center; font-weight: 700; color: var(--ad-text); transition: border-color .25s ease, color .25s ease, transform .25s ease; }
.ad-link:hover { border-color: var(--ad-accent); color: var(--ad-accent); transform: translateY(-3px); }
.ad-link small { display: block; color: var(--ad-muted); font-weight: 600; font-size: 12px; margin-top: 5px; }

/* ---------- Back ---------- */
.ad-back { text-align: center; padding: 10px 0 70px; }

/* ---------- Dark-theme nav override ---------- */
.theme-korean .nav.scrolled, .theme-nihongo .nav.scrolled {
  background: var(--ad-navbg); backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px);
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.45);
}
.theme-korean .brand-name, .theme-nihongo .brand-name { color: var(--ad-text); }
.theme-korean .brand-ai, .theme-nihongo .brand-ai { background: var(--ad-grad); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; }

/* ===========================================================
   THEME: AnswerNotebook AI — light Sakura
   =========================================================== */
.theme-anb {
  --ad-bg: linear-gradient(180deg, #FFE3EE 0%, #FFF1F6 32%, #FFF7FA 100%);
  --ad-text: #1A1A1A;
  --ad-muted: #6B7280;
  --ad-accent: #E75480;
  --ad-grad: linear-gradient(135deg, #FF7DB4 0%, #FF5C9F 50%, #E75480 100%);
  --ad-surface: #FFFFFF;
  --ad-alt: #FFF1F6;
  --ad-border: rgba(231, 84, 128, 0.16);
  --ad-chip-bg: #FFF1F6;
  --ad-nav-link: #6B7280;
  --ad-ghost-bg: #FFFFFF;
  --ad-btn-text: #FFFFFF;
  --ad-btn-shadow: 0 10px 24px rgba(255, 92, 159, 0.36);
  --ad-btn-shadow-hover: 0 14px 30px rgba(255, 92, 159, 0.46);
  --ad-icon-shadow: 0 20px 50px rgba(231, 84, 128, 0.28);
  --ad-feature-shadow: 0 22px 46px rgba(231, 84, 128, 0.18);
  --ad-shot-bg: linear-gradient(160deg, rgba(255, 125, 180, 0.20), rgba(231, 84, 128, 0.12));
}

/* ===========================================================
   THEME: Korean Journey — Hanok Night navy + taegeuk
   =========================================================== */
.theme-korean {
  --ad-bg:
    radial-gradient(1200px 620px at 82% -12%, rgba(46, 107, 230, 0.22), transparent 60%),
    radial-gradient(900px 520px at -5% 8%, rgba(228, 72, 59, 0.16), transparent 55%),
    linear-gradient(180deg, #0E2038 0%, #081426 62%);
  --ad-text: #E9F0FF;
  --ad-muted: #9DB0D0;
  --ad-accent: #5A9BFF;
  --ad-grad: linear-gradient(120deg, #6FB0FF 0%, #2E6BE6 48%, #E4483B 112%);
  --ad-surface: rgba(255, 255, 255, 0.04);
  --ad-alt: rgba(255, 255, 255, 0.015);
  --ad-border: rgba(120, 160, 255, 0.18);
  --ad-chip-bg: rgba(90, 155, 255, 0.10);
  --ad-nav-link: #9DB0D0;
  --ad-navbg: rgba(8, 20, 38, 0.72);
  --ad-ghost-bg: rgba(255, 255, 255, 0.04);
  --ad-btn-text: #FFFFFF;
  --ad-btn-shadow: 0 12px 30px rgba(46, 107, 230, 0.34);
  --ad-btn-shadow-hover: 0 16px 38px rgba(46, 107, 230, 0.5);
  --ad-icon-shadow: 0 20px 55px rgba(46, 107, 230, 0.42);
  --ad-feature-shadow: 0 22px 46px rgba(46, 107, 230, 0.24);
  --ad-shot-bg: linear-gradient(160deg, rgba(46, 107, 230, 0.18), rgba(228, 72, 59, 0.12));
}

/* ===========================================================
   THEME: Nihongo Journey — indigo night + crimson/sakura
   =========================================================== */
.theme-nihongo {
  --ad-bg:
    radial-gradient(1200px 620px at 82% -12%, rgba(230, 0, 51, 0.18), transparent 60%),
    radial-gradient(900px 520px at -5% 8%, rgba(120, 120, 255, 0.14), transparent 55%),
    linear-gradient(180deg, #141A3A 0%, #0B1026 62%);
  --ad-text: #EAECFF;
  --ad-muted: #A6ABD8;
  --ad-accent: #FF6B8A;
  --ad-grad: linear-gradient(120deg, #FF9EB5 0%, #FF4D6D 45%, #E60033 112%);
  --ad-surface: rgba(255, 255, 255, 0.04);
  --ad-alt: rgba(255, 255, 255, 0.015);
  --ad-border: rgba(180, 160, 255, 0.16);
  --ad-chip-bg: rgba(255, 107, 138, 0.10);
  --ad-nav-link: #A6ABD8;
  --ad-navbg: rgba(11, 16, 38, 0.72);
  --ad-ghost-bg: rgba(255, 255, 255, 0.04);
  --ad-btn-text: #FFFFFF;
  --ad-btn-shadow: 0 12px 30px rgba(230, 0, 51, 0.32);
  --ad-btn-shadow-hover: 0 16px 38px rgba(230, 0, 51, 0.46);
  --ad-icon-shadow: 0 20px 55px rgba(230, 0, 51, 0.35);
  --ad-feature-shadow: 0 22px 46px rgba(230, 0, 51, 0.22);
  --ad-shot-bg: linear-gradient(160deg, rgba(255, 77, 109, 0.18), rgba(120, 120, 255, 0.12));
}

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
  .ad-feature-grid, .ad-gallery { grid-template-columns: repeat(2, 1fr); }
  .ad-stats, .ad-links { grid-template-columns: repeat(2, 1fr); }
  .ad-steps { grid-template-columns: 1fr; }
}
@media (max-width: 560px) {
  .ad-hero { padding: 120px 0 32px; }
  .ad-feature-grid, .ad-gallery, .ad-stats, .ad-links { grid-template-columns: 1fr; }
  .ad-card { padding: 26px 20px; }
}

/* ===========================================================
   PREMIUM POLISH  (applies to every detail page)
   =========================================================== */

/* Hero glow behind the icon */
.ad-hero { overflow: hidden; }
.ad-hero::before {
  content: '';
  position: absolute;
  top: -120px; left: 50%;
  width: min(680px, 92vw); height: 460px;
  transform: translateX(-50%);
  background: radial-gradient(60% 60% at 50% 40%, var(--ad-glow), transparent 70%);
  filter: blur(20px);
  pointer-events: none;
  z-index: 0;
}
.ad-hero > .container { position: relative; z-index: 1; }
.ad-icon { animation: ad-float 6s ease-in-out infinite; }
@keyframes ad-float { 0%,100% { transform: translateY(0); } 50% { transform: translateY(-10px); } }

/* Equal-height, cleanly-aligned feature cards */
.ad-feature { display: flex; flex-direction: column; }
.ad-feature > p { flex: 1 0 auto; }
.ad-taglist { margin-top: 14px; }

/* Subtle staggered reveal within grids */
.ad-feature-grid .ad-feature:nth-child(3n+2),
.ad-gallery .ad-shot:nth-child(3n+2),
.ad-stats .ad-stat:nth-child(2) { transition-delay: .07s; }
.ad-feature-grid .ad-feature:nth-child(3n),
.ad-gallery .ad-shot:nth-child(3n),
.ad-stats .ad-stat:nth-child(3) { transition-delay: .14s; }
.ad-stats .ad-stat:nth-child(4) { transition-delay: .21s; }

/* Stat numbers: never overflow, wrap gracefully */
.ad-stat strong { font-size: clamp(17px, 2.3vw, 25px); line-height: 1.15; word-break: break-word; }

/* Gallery tile sheen */
.ad-shot { position: relative; }
.ad-shot::after {
  content: '';
  position: absolute; inset: 0;
  background: linear-gradient(180deg, rgba(255,255,255,0.06), transparent 40%);
  pointer-events: none;
}
.ad-shot > * { position: relative; z-index: 1; }

/* Card link titles inherit color, gain accent on hover */
.ad-page h3 a:hover, .ad-link:hover { color: var(--ad-accent); }

/* Per-theme hero glow tints */
.theme-anb     { --ad-glow: rgba(255, 92, 159, 0.22); }
.theme-korean  { --ad-glow: rgba(46, 107, 230, 0.30); }
.theme-nihongo { --ad-glow: rgba(230, 0, 51, 0.26); }
.theme-helixia { --ad-glow: rgba(56, 217, 240, 0.28); }

/* ===========================================================
   THEME: Helixia — premium dark biotechnology
   =========================================================== */
.theme-helixia {
  --ad-bg:
    radial-gradient(1200px 620px at 82% -12%, rgba(59, 130, 246, 0.20), transparent 60%),
    radial-gradient(900px 520px at -5% 8%, rgba(139, 92, 246, 0.18), transparent 55%),
    radial-gradient(700px 500px at 50% 112%, rgba(45, 212, 191, 0.12), transparent 60%),
    linear-gradient(180deg, #0B1236 0%, #04061E 62%);
  --ad-text: #E7ECFF;
  --ad-muted: #9AA6D0;
  --ad-accent: #38D9F0;
  --ad-grad: linear-gradient(120deg, #38D9F0 0%, #3B82F6 45%, #8B5CF6 100%);
  --ad-surface: rgba(255, 255, 255, 0.04);
  --ad-alt: rgba(255, 255, 255, 0.015);
  --ad-border: rgba(120, 160, 255, 0.18);
  --ad-chip-bg: rgba(56, 217, 240, 0.10);
  --ad-nav-link: #9AA6D0;
  --ad-navbg: rgba(4, 6, 30, 0.72);
  --ad-ghost-bg: rgba(255, 255, 255, 0.04);
  --ad-btn-text: #04061E;
  --ad-btn-shadow: 0 12px 30px rgba(56, 217, 240, 0.34);
  --ad-btn-shadow-hover: 0 16px 38px rgba(56, 217, 240, 0.5);
  --ad-icon-shadow: 0 20px 55px rgba(59, 130, 246, 0.42);
  --ad-feature-shadow: 0 22px 46px rgba(59, 130, 246, 0.24);
  --ad-shot-bg: linear-gradient(160deg, rgba(59, 130, 246, 0.16), rgba(139, 92, 246, 0.12));
}
.theme-helixia .nav.scrolled {
  background: var(--ad-navbg); backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px);
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.45);
}
.theme-helixia .brand-name { color: var(--ad-text); }
.theme-helixia .brand-ai { background: var(--ad-grad); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; }

@media (prefers-reduced-motion: reduce) {
  .ad-icon { animation: none; }
}