/* ============================================================
   style.css — Concert Support Stick
   Tailwind CDN → 本地静态化 + 自定义样式合并 + 正文字体放大
   ============================================================ */

/* ===== RESET & BASE ===== */
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: 'Inter', sans-serif;
  font-size: 1.15rem;     /* 18.4px（原 1.05rem ≈ 16.8px） */
  background: #000;
  color: #fff;
  overflow-x: hidden;
  line-height: 1.7;
}
h1, h2, h3, h4 { font-family: 'Space Grotesk', sans-serif; }
a { text-decoration: none; color: inherit; }
img { max-width: 100%; height: auto; display: block; }
section { position: relative; }

/* ===== DISPLAY ===== */
.hidden { display: none; }
.inline { display: inline; }
.inline-block { display: inline-block; }
.inline-flex { display: inline-flex; }
.flex { display: flex; }
.flex-wrap { flex-wrap: wrap; }
.justify-between { justify-content: space-between; }
.justify-center { justify-content: center; }
.items-center { align-items: center; }
.items-start { align-items: flex-start; }
.gap-2 { gap: 0.5rem; }
.gap-3 { gap: 0.75rem; }
.gap-4 { gap: 1rem; }
.gap-5 { gap: 1.25rem; }
.gap-8 { gap: 2rem; }
.gap-16 { gap: 4rem; }
.grid { display: grid; }
.grid-cols-2 { grid-template-columns: repeat(2, 1fr); }
.grid-cols-3 { grid-template-columns: repeat(3, 1fr); }
.block { display: block; }

.relative { position: relative; }
.absolute { position: absolute; }
.fixed { position: fixed; }
.inset-0 { top: 0; right: 0; bottom: 0; left: 0; }
.top-6 { top: 1.5rem; }
.left-6 { left: 1.5rem; }
.right-6 { right: 1.5rem; }
.bottom-8 { bottom: 2rem; }
.right-8 { right: 2rem; }
.z-[100] { z-index: 100; }
.z-50 { z-index: 50; }
.z-10 { z-index: 10; }
.z-[2] { z-index: 2; }
.z-[1] { z-index: 1; }
.pointer-events-none { pointer-events: none; }
.overflow-hidden { overflow: hidden; }
.object-cover { object-fit: cover; }
.shrink-0 { flex-shrink: 0; }

/* ===== TYPOGRAPHY ===== */
.text-xs { font-size: 0.875rem; }     /* 14px（原 12px） */
.text-sm { font-size: 1rem; }         /* 16px（原 14px） */
.text-base { font-size: 1.0625rem; }  /* 17px（原 16px） */
.text-lg { font-size: 1.1875rem; }    /* 19px（原 18px） */
.text-xl { font-size: 1.25rem; }
.text-4xl { font-size: 2.25rem; }
.text-5xl { font-size: 3rem; }
.text-[9px] { font-size: 9px; }
.text-[clamp\(1rem\,1\.4vw\,1\.2rem\)] { font-size: clamp(1rem,1.4vw,1.2rem); }
.text-[clamp\(3\.6rem\,9vw\,6\.4rem\)] { font-size: clamp(3.6rem,9vw,6.4rem); }
.text-[clamp\(1\.8rem\,3\.5vw\,2\.8rem\)] { font-size: clamp(1.8rem,3.5vw,2.8rem); }
.text-[clamp\(1\.5rem\,3vw\,2\.4rem\)] { font-size: clamp(1.5rem,3vw,2.4rem); }
.text-[clamp\(1\.6rem\,3\.5vw\,2\.8rem\)] { font-size: clamp(1.6rem,3.5vw,2.8rem); }
.text-[0\.95rem] { font-size: 1rem; }       /* 16px（原 ~15px） */
.text-[0\.9rem] { font-size: 0.95rem; }     /* ~15px（原 ~14px） */
.text-[0\.85rem] { font-size: 0.92rem; }    /* ~14.7px（原 ~13.6px） */
.text-[0\.82rem] { font-size: 0.9rem; }     /* ~14.4px（原 ~13px） */
.text-[1rem] { font-size: 1.0625rem; }      /* 17px（原 16px） */
.text-[0\.6rem] { font-size: 0.65rem; }

.font-medium { font-weight: 500; }
.font-semibold { font-weight: 600; }
.font-bold { font-weight: 700; }
.font-\[800\] { font-weight: 800; }
.font-light { font-weight: 300; }

.leading-\[1\.04\] { line-height: 1.04; }
.leading-\[1\.1\] { line-height: 1.1; }
.leading-relaxed { line-height: 1.625; }

.tracking-\[0\.3em\] { letter-spacing: 0.3em; }
.tracking-\[0\.5em\] { letter-spacing: 0.5em; }
.tracking-\[-0\.03em\] { letter-spacing: -0.03em; }
.tracking-wider { letter-spacing: 0.05em; }

.text-center { text-align: center; }
.text-left { text-align: left; }
.uppercase { text-transform: uppercase; }

.no-underline { text-decoration: none; }

/* ===== TEXT COLORS ===== */
.text-white { color: #fff; }
.text-white\/70 { color: rgba(255,255,255,0.7); }
.text-white\/80 { color: rgba(255,255,255,0.8); }
.text-white\/90 { color: rgba(255,255,255,0.9); }
.text-indigo-400 { color: #818cf8; }
.text-slate-300 { color: #cbd5e1; }
.text-slate-400 { color: #94a3b8; }
.text-slate-500 { color: #64748b; }
.text-slate-600 { color: #475569; }
.text-slate-800 { color: #1e293b; }
.text-cyan-400 { color: #22d3ee; }
.text-purple-400 { color: #c084fc; }
.text-amber-400 { color: #fbbf24; }

.hover\:text-indigo-400:hover { color: #818cf8; }
.hover\:text-indigo-300:hover { color: #a5b4fc; }
.hover\:text-cyan-300:hover { color: #67e8f9; }
.hover\:text-purple-300:hover { color: #d8b4fe; }

/* ===== BACKGROUND ===== */
.bg-black { background: #000; }
.bg-indigo-500\/10 { background: rgba(99,102,241,0.1); }
.bg-indigo-500\/15 { background: rgba(99,102,241,0.15); }
.bg-indigo-600 { background: #6366f1; }
.bg-cyan-500\/10 { background: rgba(6,182,212,0.1); }
.bg-cyan-500\/15 { background: rgba(6,182,212,0.15); }
.bg-purple-500\/10 { background: rgba(168,85,247,0.1); }
.bg-purple-500\/15 { background: rgba(168,85,247,0.15); }
.bg-amber-500\/10 { background: rgba(251,191,36,0.1); }
.bg-amber-500\/15 { background: rgba(251,191,36,0.15); }
.bg-white\/\[\.02\] { background: rgba(255,255,255,0.02); }
.bg-white\/\[0\.03\] { background: rgba(255,255,255,0.03); }
.bg-white\/\[0\.06\] { background: rgba(255,255,255,0.06); }
.bg-\[#25D366\] { background: #25D366; }
.bg-cover { background-size: cover; }
.bg-center { background-position: center; }
.bg-gradient-to-t { background-image: linear-gradient(to top, var(--tw-gradient-stops)); }
.from-indigo-950\/10 { --tw-gradient-from: rgba(30,27,75,0.1); --tw-gradient-stops: var(--tw-gradient-from), var(--tw-gradient-to, rgba(30,27,75,0)); }
.to-transparent { --tw-gradient-to: transparent; }

.hover\:bg-indigo-500:hover { background: #6366f1; }
.hover\:bg-white\/\[0\.06\]:hover { background: rgba(255,255,255,0.06); }
.hover\:scale-110:hover { transform: scale(1.1); }

/* ===== WIDTH / HEIGHT ===== */
.w-full { width: 100%; }
.w-8 { width: 2rem; }
.w-12 { width: 3rem; }
.w-14 { width: 3.5rem; }
.w-\[7px\] { width: 7px; }
.h-full { height: 100%; }
.h-8 { height: 2rem; }
.h-12 { height: 3rem; }
.h-14 { height: 3.5rem; }
.h-\[7px\] { height: 7px; }
.h-px { height: 1px; }
.min-w-\[48px\] { min-width: 48px; }
.min-h-screen { min-height: 100vh; }

.max-w-\[900px\] { max-width: 900px; }
.max-w-\[1100px\] { max-width: 1100px; }
.max-w-\[1000px\] { max-width: 1000px; }
.max-w-\[900px\] { max-width: 900px; }
.max-w-\[800px\] { max-width: 800px; }
.max-w-\[700px\] { max-width: 700px; }
.max-w-\[680px\] { max-width: 680px; }
.max-w-\[620px\] { max-width: 620px; }
.max-w-\[600px\] { max-width: 600px; }
.max-w-4xl { max-width: 56rem; }
.max-w-7xl { max-width: 80rem; }
.max-w-2xl { max-width: 42rem; }
.aspect-\[4\/3\] { aspect-ratio: 4/3; }
.aspect-\[16\/9\] { aspect-ratio: 16/9; }
.aspect-video { aspect-ratio: 16/9; }

/* ===== SPACING ===== */
.mx-auto { margin-left: auto; margin-right: auto; }
.mr-2 { margin-right: 0.5rem; }
.mt-2 { margin-top: 0.5rem; }
.mt-4 { margin-top: 1rem; }
.mt-6 { margin-top: 1.5rem; }
.mt-8 { margin-top: 2rem; }
.mt-12 { margin-top: 3rem; }
.mt-32 { margin-top: 8rem; }
.mb-2 { margin-bottom: 0.5rem; }
.mb-4 { margin-bottom: 1rem; }
.mb-5 { margin-bottom: 1.25rem; }
.mb-6 { margin-bottom: 1.5rem; }
.mb-8 { margin-bottom: 2rem; }
.mb-10 { margin-bottom: 2.5rem; }
.mb-12 { margin-bottom: 3rem; }
.mb-14 { margin-bottom: 3.5rem; }

.p-4 { padding: 1rem; }
.p-6 { padding: 1.5rem; }
.p-8 { padding: 2rem; }
.py-2 { padding-top: 0.5rem; padding-bottom: 0.5rem; }
.py-4 { padding-top: 1rem; padding-bottom: 1rem; }
.py-16 { padding-top: 4rem; padding-bottom: 4rem; }
.py-20 { padding-top: 5rem; padding-bottom: 5rem; }
.py-24 { padding-top: 6rem; padding-bottom: 6rem; }
.py-28 { padding-top: 7rem; padding-bottom: 7rem; }
.py-32 { padding-top: 8rem; padding-bottom: 8rem; }
.px-4 { padding-left: 1rem; padding-right: 1rem; }
.px-6 { padding-left: 1.5rem; padding-right: 1.5rem; }
.px-8 { padding-left: 2rem; padding-right: 2rem; }
.px-10 { padding-left: 2.5rem; padding-right: 2.5rem; }
.px-12 { padding-left: 3rem; padding-right: 3rem; }
.pt-12 { padding-top: 3rem; }
.pt-6 { padding-top: 1.5rem; }

/* ===== BORDERS ===== */
.border { border: 1px solid; }
.border-t { border-top-width: 1px; }
.border-white\/5 { border-color: rgba(255,255,255,0.05); }
.border-white\/\[\.06\] { border-color: rgba(255,255,255,0.06); }
.border-white\/10 { border-color: rgba(255,255,255,0.1); }
.border-white\/\[0\.06\] { border-color: rgba(255,255,255,0.06); }
.border-indigo-500\/15 { border-color: rgba(99,102,241,0.15); }
.rounded-full { border-radius: 9999px; }
.rounded-2xl { border-radius: 1rem; }
.rounded-xl { border-radius: 0.75rem; }

/* ===== SHADOWS ===== */
.shadow-lg { box-shadow: 0 10px 15px rgba(0,0,0,0.1); }

/* ===== TRANSITIONS ===== */
.transition { transition: all 0.2s ease; }
.transition-all { transition: all 0.2s ease; }
.duration-300 { transition-duration: 0.3s; }

/* ===== RESPONSIVE: md (768px+) ===== */
@media (min-width: 768px) {
  .md\:flex { display: flex; }
  .md\:inline { display: inline; }
  .md\:h-10 { height: 2.5rem; }
  .md\:grid-cols-2 { grid-template-columns: repeat(2, 1fr); }
  .md\:grid-cols-3 { grid-template-columns: repeat(3, 1fr); }
  .md\:px-12 { padding-left: 3rem; padding-right: 3rem; }
  .md\:p-12 { padding: 3rem; }
  .md\:text-right { text-align: right; }
  .md\:text-5xl { font-size: 3rem; }
}

/* ============================================================
   CUSTOM STYLES（来自内联 <style> 块）
   ============================================================ */

/* ---- Scroll Reveal ---- */
.rv { opacity: 0; transform: translateY(28px); transition: all 0.6s ease-out; }
.rv.show { opacity: 1; transform: translateY(0); }

/* ---- Gradient Text ---- */
.gr-txt { color: transparent; background: linear-gradient(135deg, #c4b5fd, #2dd4bf); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; }

/* ---- Card ---- */
.crd { background: rgba(255,255,255,0.02); border: 1px solid rgba(255,255,255,0.06); border-radius: 16px; transition: border-color 0.3s, transform 0.3s; }
.crd:hover { border-color: rgba(99,102,241,0.2); transform: translateY(-3px); }

/* ---- Pull Quote ---- */
.pull { font-size: clamp(1rem,1.6vw,1.25rem); font-weight: 300; line-height: 1.6; color: #c7d2fe; max-width: 720px; margin: 0 auto; text-align: center; font-style: italic; padding: 0 20px; }
.pull cite { display: block; font-size: 0.7rem; color: #475569; font-style: normal; margin-top: 12px; letter-spacing: 0.15em; text-transform: uppercase; }

/* ---- FAQ Single Column ---- */
.faq-s { max-width: 680px; margin: 0 auto; }
.faq-s-item { border-bottom: 1px solid rgba(255,255,255,0.05); }
.faq-s-btn { width: 100%; display: flex; justify-content: space-between; align-items: flex-start; padding: 18px 0; background: none; border: none; color: #e2e8f0; font-size: 0.95rem; font-weight: 600; cursor: pointer; font-family: 'Inter', sans-serif; text-align: left; transition: color 0.3s; }
.faq-s-btn:hover { color: #a5b4fc; }
.faq-s-btn .arr { font-size: 1.1rem; color: #6366f1; transition: transform 0.3s; flex-shrink: 0; margin-left: 12px; margin-top: 2px; }
.faq-s-item.open .arr { transform: rotate(180deg); }
.faq-s-body { max-height: 0; overflow: hidden; transition: max-height 0.4s ease; }
.faq-s-body-inner { padding: 0 0 18px; font-size: 0.95rem; color: #64748b; line-height: 1.65; }

/* ---- Evidence Grid ---- */
.evidence-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.evidence-card { padding: 32px 24px; border-radius: 16px; background: linear-gradient(135deg, rgba(99,102,241,0.04), rgba(6,182,212,0.04)); border: 1px solid rgba(255,255,255,0.05); text-align: center; }
.evidence-card .big { font-size: 2.6rem; font-weight: 800; line-height: 1; margin-bottom: 8px; font-family: 'Space Grotesk', sans-serif; }
.evidence-card h4 { font-size: 1.05rem; font-weight: 700; margin-bottom: 8px; }
.evidence-card p { font-size: 0.9rem; color: #64748b; line-height: 1.5; }

@media (max-width: 1024px) { .evidence-grid { grid-template-columns: 1fr 1fr; } }
@media (max-width: 768px) { .evidence-grid { grid-template-columns: 1fr; } }

/* ---- Separator ---- */
.h-px { height: 1px; }
.w-full { width: 100%; }

/* ---- Nav Background ---- */
.nav-bg { background: rgba(10,10,10,0.75); backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px); border: 1px solid rgba(255,255,255,0.06); border-radius: 60px; padding: 0.6rem 2rem; }
@media (max-width: 768px) {
  .nav-bg { border-radius: 40px; padding: 0.5rem 1.2rem; }
}

/* ---- Stat Card / Border Glow（HubSpot Form section） ---- */
.stat-card { background: rgba(255,255,255,0.02); backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px); border: 1px solid rgba(255,255,255,0.04); }
.border-glow { border: 1px solid rgba(99,102,241,0.15); transition: border-color 0.4s ease; }
.border-glow:hover { border-color: rgba(99,102,241,0.4); }

/* ---- HubSpot Form ---- */
#hubspot-form-container .hs-form { display: flex; flex-direction: column; gap: 1.2rem; }
#hubspot-form-container .hs-form label { color: #94a3b8; font-size: 0.85rem; font-weight: 500; letter-spacing: 0.02em; }
#hubspot-form-container .hs-form input,
#hubspot-form-container .hs-form textarea,
#hubspot-form-container .hs-form select { background: rgba(255,255,255,0.03); border: 1px solid rgba(255,255,255,0.08); border-radius: 12px; padding: 0.9rem 1.2rem; color: #f1f5f9; font-size: 0.95rem; width: 100% !important; outline: none; transition: border 0.25s ease; }
#hubspot-form-container .hs-form input:focus,
#hubspot-form-container .hs-form textarea:focus,
#hubspot-form-container .hs-form select:focus { border-color: #6366f1; box-shadow: 0 0 0 3px rgba(99,102,241,0.15); }
#hubspot-form-container .hs-form .hs-button { background: #6366f1; border: none; border-radius: 40px; padding: 1rem 2.4rem; font-weight: 600; color: #fff; font-size: 1rem; cursor: pointer; transition: all 0.3s ease; width: auto; align-self: flex-start; }
#hubspot-form-container .hs-form .hs-button:hover { background: #4f46e5; box-shadow: 0 0 40px rgba(99,102,241,0.25); transform: scale(1.02); }
#hubspot-form-container .hs-form .hs-error-msgs { color: #f87171; font-size: 0.75rem; list-style: none; padding: 0; margin: 0.25rem 0 0 0; }
#hubspot-form-container .hs-form .legal-consent-container { font-size: 0.75rem; color: #64748b; line-height: 1.5; }
#hubspot-form-container .hs-form .legal-consent-container a { color: #818cf8; text-decoration: underline; }