/* =========================================================================
   STAIN DETAIL PAGES — "Splash Lab"
   Playful blue, water-and-bubbles aesthetic. Shares design tokens
   (--blue, --cyan, --ink, --ease, --bounce, --r*) defined in styles.css.
   Headings inherit Fredoka globally; body inherits Outfit.
   ========================================================================= */

/* ---------- Breadcrumb ---------- */
.breadcrumb {
    background: rgba(255, 255, 255, .7);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    padding: 14px 0;
    border-bottom: 1px solid rgba(47, 107, 255, .12);
    font-size: 14px;
    font-weight: 500;
}
.breadcrumb a {
    color: var(--blue);
    text-decoration: none;
    transition: color .3s var(--ease);
}
.breadcrumb a:hover { color: var(--blue-700); }
.breadcrumb strong { color: var(--ink); }

/* ---------- Hero ---------- */
.stain-detail { background: transparent; }

.stain-hero {
    position: relative;
    padding: 76px 20px 70px;
    text-align: center;
    overflow: hidden;
    background:
        radial-gradient(700px 360px at 80% -10%, rgba(31,211,240,.18), transparent 60%),
        radial-gradient(620px 340px at 10% 120%, rgba(141,243,234,.20), transparent 55%),
        linear-gradient(180deg, #f4faff 0%, #ffffff 100%);
}
.stain-hero-image,
.coffee-stain-large { display: none; }

.stain-hero-content { max-width: 800px; margin: 0 auto; position: relative; z-index: 1; }
.stain-hero-content h1 {
    font-weight: 700;
    font-size: clamp(2.4rem, 6vw, 3.6rem);
    line-height: 1.04;
    letter-spacing: -.5px;
    margin-bottom: 22px;
    color: var(--ink);
}
.lead {
    font-size: clamp(1.08rem, 2vw, 1.3rem);
    color: var(--ink-soft);
    line-height: 1.8;
    margin-bottom: 32px;
}
.difficulty-badge {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    background: #fff;
    padding: 12px 24px;
    border-radius: 999px;
    box-shadow: var(--shadow), var(--ring);
}
.badge-label { font-weight: 600; color: var(--ink); }
.badge-value {
    padding: 5px 16px;
    border-radius: 999px;
    font-family: 'Fredoka', sans-serif;
    font-weight: 600;
    font-size: 14px;
}
.badge-value.easy   { background: #d8f7e6; color: #047857; }
.badge-value.medium { background: #ffedd0; color: #b45309; }
.badge-value.hard   { background: #ffe0e0; color: #b91c1c; }

/* ---------- Shared section heading rhythm ---------- */
.quick-facts h2,
.guide-section h2,
.products-section h2,
.diy-section h2,
.faq-section h2,
.related-section h2 {
    text-align: center;
    font-weight: 600;
    font-size: clamp(1.8rem, 4vw, 2.6rem);
    letter-spacing: -.4px;
    color: var(--ink);
    margin-bottom: 44px;
}

/* ---------- Quick Facts ---------- */
.quick-facts { padding: 64px 20px; background: transparent; }
.facts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 22px;
    max-width: 1000px;
    margin: 0 auto;
}
.fact-card {
    position: relative;
    background: linear-gradient(160deg, #eaf4ff 0%, #d8ecff 100%);
    padding: 32px 22px;
    border-radius: var(--r-lg);
    text-align: center;
    border: 1px solid rgba(47, 107, 255, .16);
    box-shadow: var(--shadow-sm);
    transition: transform .4s var(--bounce), box-shadow .4s var(--ease);
    overflow: hidden;
}
.fact-card::after {              /* glossy water highlight */
    content: "";
    position: absolute;
    top: -30%; left: -20%;
    width: 80%; height: 70%;
    background: radial-gradient(circle, rgba(255,255,255,.5), transparent 70%);
    pointer-events: none;
}
.fact-card:hover {
    transform: translateY(-7px);
    box-shadow: var(--shadow-lg), 0 0 0 1px rgba(31,211,240,.35);
}
.fact-icon {
    font-size: 3rem;
    margin-bottom: 14px;
    display: inline-block;
    transition: transform .4s var(--bounce);
}
.fact-card:hover .fact-icon { transform: scale(1.12) rotate(-6deg); }
.fact-card h3 { font-size: 1.1rem; margin-bottom: 8px; color: var(--ink); }
.fact-card p  { font-size: 1rem; color: var(--blue-700); font-weight: 600; }

/* ---------- Step-by-Step ---------- */
.guide-section { padding: 64px 20px; background: transparent; }
.step {
    display: grid;
    grid-template-columns: 76px 1fr;
    gap: 28px;
    align-items: start;
    max-width: 900px;
    margin: 0 auto 26px;
    background: rgba(255, 255, 255, .9);
    padding: 30px 32px;
    border-radius: var(--r-lg);
    border: 1px solid rgba(255, 255, 255, .9);
    box-shadow: var(--shadow-sm), var(--ring);
    transition: transform .35s var(--ease), box-shadow .35s var(--ease);
}
.step:hover { transform: translateY(-4px); box-shadow: var(--shadow); }
.step-number {
    width: 62px; height: 62px;
    background: linear-gradient(150deg, var(--blue) 0%, var(--blue-700) 60%, #0a2a78 100%);
    color: #fff;
    border-radius: 50%;
    display: flex; align-items: center; justify-content: center;
    font-family: 'Fredoka', sans-serif;
    font-size: 1.7rem; font-weight: 700;
    flex-shrink: 0;
    box-shadow: 0 8px 18px -6px rgba(47, 107, 255, .6), inset 0 2px 0 rgba(255,255,255,.3);
}
.step-content h3 { font-size: 1.4rem; margin-bottom: 12px; color: var(--ink); }
.step-content p  { color: var(--ink-soft); line-height: 1.8; margin-bottom: 14px; }
.step-content ul, .step-content ol { margin-left: 20px; color: var(--ink-soft); line-height: 1.8; }
.step-content li { margin-bottom: 8px; }

.tip {
    padding: 15px 20px;
    border-radius: var(--r-sm);
    margin-top: 18px;
    border-left: 4px solid;
}
.tip.warning { background: #fff5da; border-color: var(--sun);   color: #92510e; }
.tip.info    { background: #e1efff; border-color: var(--blue);  color: #1e40af; }
.tip.success { background: #d8f7e6; border-color: #10b981;      color: #065f46; }

/* ---------- Products ---------- */
.products-section { padding: 64px 20px; background: transparent; }
.products-section h2 { margin-bottom: 14px; }
.section-subtitle {
    text-align: center;
    color: var(--ink-soft);
    font-size: 1.1rem;
    margin-bottom: 42px;
}
.products-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 26px;
    max-width: 1200px;
    margin: 0 auto;
}
.product-card {
    position: relative;
    background: #fff;
    border: 1px solid rgba(47, 107, 255, .14);
    border-radius: var(--r-lg);
    padding: 28px 25px;
    text-align: center;
    box-shadow: var(--shadow-sm);
    transition: transform .4s var(--bounce), box-shadow .4s var(--ease), border-color .4s var(--ease);
}
.product-card:hover {
    border-color: rgba(47, 107, 255, .4);
    box-shadow: var(--shadow-lg);
    transform: translateY(-8px);
}
.product-badge {
    position: absolute;
    top: -12px; right: 22px;
    padding: 6px 16px;
    border-radius: 999px;
    font-family: 'Fredoka', sans-serif;
    font-size: 12px; font-weight: 700;
    color: #fff;
    box-shadow: var(--shadow-sm);
}
.product-badge.bestseller  { background: linear-gradient(135deg, var(--sun), #f59e0b); color: var(--ink); }
.product-badge.recommended { background: linear-gradient(135deg, #10b981, #059669); }
.product-image { font-size: 4rem; margin: 18px 0; }
.product-card h3 { font-size: 1.25rem; margin-bottom: 12px; color: var(--ink); }
.product-desc { color: var(--ink-soft); font-size: .95rem; line-height: 1.6; margin-bottom: 14px; min-height: 60px; }
.product-rating { font-size: .9rem; margin-bottom: 10px; color: var(--ink-soft); }
.product-price { font-family: 'Fredoka', sans-serif; font-size: 1.5rem; font-weight: 700; color: var(--blue-700); margin-bottom: 16px; }
.product-link {
    display: inline-block;
    padding: 11px 26px;
    background: linear-gradient(120deg, var(--blue), var(--cyan));
    color: #fff;
    text-decoration: none;
    border-radius: 999px;
    font-weight: 600;
    box-shadow: 0 8px 18px -8px rgba(47,107,255,.6);
    transition: transform .3s var(--bounce), box-shadow .3s var(--ease);
}
.product-link:hover { transform: translateX(4px) scale(1.03); box-shadow: 0 12px 24px -8px rgba(47,107,255,.7); }

/* ---------- DIY (natural remedy — fresh green accent for contrast) ---------- */
.diy-section {
    padding: 64px 20px;
    background:
        radial-gradient(600px 300px at 90% 0%, rgba(141,243,234,.35), transparent 60%),
        linear-gradient(160deg, #eafff4 0%, #d7f6e6 100%);
}
.diy-content {
    max-width: 820px;
    margin: 0 auto;
    background: #fff;
    padding: 42px;
    border-radius: var(--r-xl);
    box-shadow: var(--shadow);
}
.diy-content h3 { font-size: 1.7rem; margin-bottom: 18px; color: var(--ink); }
.diy-content > p { color: var(--ink-soft); line-height: 1.8; margin-bottom: 28px; }
.recipe {
    background: #f1f9ff;
    padding: 26px;
    border-radius: var(--r);
    margin-bottom: 24px;
    border: 1px solid rgba(47,107,255,.1);
}
.recipe h4 { font-size: 1.3rem; margin-bottom: 14px; color: var(--ink); }
.recipe ul, .recipe ol { margin-left: 20px; color: var(--ink-soft); line-height: 1.8; }
.recipe li { margin-bottom: 10px; }

/* ---------- FAQ ---------- */
.faq-section { padding: 64px 20px; background: transparent; }
.faq-item {
    max-width: 820px;
    margin: 0 auto 22px;
    background: rgba(255, 255, 255, .9);
    padding: 28px 32px;
    border-radius: var(--r-lg);
    border-left: 5px solid var(--blue);
    box-shadow: var(--shadow-sm);
    transition: transform .3s var(--ease), box-shadow .3s var(--ease), border-color .3s var(--ease);
}
.faq-item:hover { transform: translateX(4px); border-left-color: var(--cyan); box-shadow: var(--shadow); }
.faq-item h3 { font-size: 1.25rem; margin-bottom: 12px; color: var(--ink); }
.faq-item p { color: var(--ink-soft); line-height: 1.8; }

/* ---------- Related ---------- */
.related-section { padding: 64px 20px 80px; background: transparent; }
.related-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 22px;
    max-width: 1000px;
    margin: 0 auto;
}
.related-card {
    background: rgba(255, 255, 255, .85);
    padding: 30px 20px;
    border-radius: var(--r-lg);
    text-align: center;
    text-decoration: none;
    color: var(--ink);
    border: 1px solid rgba(255,255,255,.9);
    box-shadow: var(--shadow-sm), var(--ring);
    transition: transform .4s var(--bounce), box-shadow .4s var(--ease), border-color .4s var(--ease);
}
.related-card:hover {
    transform: translateY(-9px);
    border-color: rgba(47, 107, 255, .35);
    box-shadow: var(--shadow-lg);
}
.related-icon { font-size: 4rem; margin-bottom: 14px; display: inline-block; transition: transform .4s var(--bounce); }
.related-card:hover .related-icon { transform: scale(1.12) rotate(6deg); }
.related-card h3 { font-size: 1.2rem; font-weight: 600; }

/* ---------- Responsive ---------- */
@media (max-width: 768px) {
    .stain-hero { padding: 50px 20px; }
    .step { grid-template-columns: 1fr; gap: 16px; padding: 26px 22px; }
    .step-number { width: 54px; height: 54px; font-size: 1.5rem; margin: 0 auto; }
    .products-grid { grid-template-columns: 1fr; }
    .related-grid { grid-template-columns: repeat(2, 1fr); }
    .diy-content { padding: 30px 22px; }
}

/* ---------- AdSense ---------- */
.adsense-detail-container {
    max-width: 900px;
    margin: 50px auto;
    padding: 0 20px;
    display: flex; justify-content: center; align-items: center;
}
.adsense-detail-container.after-hero { margin-top: 0; padding-top: 40px; }
.adsense-detail-container.in-content {
    margin: 60px auto;
    padding: 30px 20px;
    background: rgba(255,255,255,.6);
    border-radius: var(--r);
}
.adsense-detail-container.before-footer { margin-bottom: 0; padding-bottom: 50px; }
@media (max-width: 768px) {
    .adsense-detail-container { margin: 40px auto; padding: 0 10px; }
    .adsense-detail-container.in-content { margin: 50px auto; padding: 20px 10px; }
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
    .fact-card, .step, .product-card, .faq-item, .related-card,
    .fact-icon, .related-icon, .product-link { transition: none !important; }
}