/* ============================================================
   红杉学社 — Shared Stylesheet v3 (Multi-page)
   ============================================================ */
:root {
  --primary:#B8621B; --primary-dark:#9A5118; --secondary:#D4A574;
  --dark:#4A2C17; --text:#A07850; --bg:#FFFCF8; --cream:#FFF3E6; --white:#fff;
  --radius:16px; --radius-sm:10px;
  --shadow:0 16px 64px rgba(74,44,23,.07); --shadow-sm:0 4px 24px rgba(74,44,23,.06);
  --transition:.3s cubic-bezier(.4,0,.2,1);
  --serif:'Noto Serif SC',Georgia,serif; --sans:'Noto Sans SC',-apple-system,sans-serif;
  --max-w:960px; --wide:1200px;
}
*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;font-size:16px}
body{font-family:var(--sans);color:var(--text);background:var(--bg);line-height:1.8;-webkit-font-smoothing:antialiased;overflow-x:hidden}
img{max-width:100%;height:auto;display:block}
a{color:inherit;text-decoration:none;transition:color var(--transition)}
ul{list-style:none}

/* ---------- Layout ---------- */
.container{max-width:var(--max-w);margin:0 auto;padding:0 48px}
.container-wide{max-width:var(--wide);margin:0 auto;padding:0 48px}
.section{padding:64px 0;position:relative}
.section-header{text-align:center;margin-bottom:64px}
.section-tag{display:inline-block;font-size:11px;letter-spacing:.3em;color:#C4A882;text-transform:uppercase;margin-bottom:12px}
.section-title{font-family:var(--serif);font-size:32px;font-weight:700;color:var(--dark);letter-spacing:.06em}
.section-subtitle{max-width:600px;margin:16px auto 0;font-size:15px;color:#7A6550;line-height:2}

/* ---------- Buttons ---------- */
.btn{display:inline-block;padding:14px 36px;border-radius:8px;font-size:14px;font-weight:500;font-family:var(--sans);cursor:pointer;transition:all var(--transition);border:none;letter-spacing:.05em}
.btn-primary{background:var(--primary);color:var(--white)}
.btn-primary:hover{background:var(--primary-dark);transform:translateY(-2px);box-shadow:0 8px 24px rgba(184,98,27,.25)}
.btn-outline{background:transparent;color:var(--primary);border:1.5px solid var(--primary)}
.btn-outline:hover{background:var(--primary);color:var(--white);transform:translateY(-2px)}
.btn-sm{padding:10px 24px;font-size:13px}

/* ============ NAVBAR ============ */
.navbar{position:fixed;top:0;left:0;right:0;z-index:1000;padding:16px 0;transition:all var(--transition);background:rgba(255,252,248,.95);backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);border-bottom:1px solid rgba(212,165,116,.06)}
.navbar.scrolled{padding:12px 0;box-shadow:0 1px 0 rgba(212,165,116,.1)}
/* On dark banners: transparent until scrolled */
.navbar--over-dark{background:transparent;backdrop-filter:none;-webkit-backdrop-filter:none;border-bottom:none}
.navbar--over-dark.scrolled{background:rgba(255,252,248,.92);backdrop-filter:blur(20px);-webkit-backdrop-filter:blur(20px)}
.nav-container{max-width:var(--wide);margin:0 auto;padding:0 48px;display:flex;align-items:center;justify-content:space-between}
.nav-logo img{height:96px;width:auto}
.nav-links{display:flex;gap:36px}
.nav-links a{font-size:16px;color:var(--dark);letter-spacing:.05em;position:relative;transition:color var(--transition)}
.nav-links a::after{content:'';position:absolute;bottom:-4px;left:0;width:0;height:1.5px;background:var(--primary);transition:width var(--transition)}
.nav-links a:hover,.nav-links a.active{color:var(--primary)}
.nav-links a:hover::after,.nav-links a.active::after{width:100%}
/* Light nav on dark hero backgrounds */
.navbar--over-dark:not(.scrolled) .nav-links a{color:rgba(255,243,230,.85)}
.navbar--over-dark:not(.scrolled) .nav-links a:hover,.navbar--over-dark:not(.scrolled) .nav-links a.active{color:#fff}
.navbar--over-dark:not(.scrolled) .nav-links a::after{background:rgba(255,243,230,.6)}
.navbar--over-dark:not(.scrolled) .lang-switch{color:rgba(255,243,230,.85);border-color:rgba(255,243,230,.3)}
.navbar--over-dark:not(.scrolled) .lang-switch:hover{background:rgba(255,255,255,.15);color:#fff;border-color:rgba(255,255,255,.4)}
.navbar--over-dark:not(.scrolled) .nav-toggle span{background:rgba(255,243,230,.85)}
.navbar--over-dark:not(.scrolled) .nav-logo img{opacity:.85}
.nav-actions{display:flex;align-items:center;gap:16px}
.lang-switch{padding:6px 16px;border:1px solid var(--secondary);border-radius:20px;background:transparent;color:var(--dark);font-size:12px;font-weight:500;letter-spacing:.1em;cursor:pointer;font-family:var(--sans);transition:all var(--transition)}
.lang-switch:hover{background:var(--primary);color:var(--white);border-color:var(--primary)}
.nav-toggle{display:none;flex-direction:column;gap:5px;background:none;border:none;cursor:pointer;padding:4px}
.nav-toggle span{display:block;width:22px;height:1.5px;background:var(--dark);transition:all var(--transition)}

/* ============ HIGHLIGHT ACCENT ============ */
.hl{color:var(--primary)}

/* ============ HERO V2 — editorial, left-aligned ============ */
.hero-v2{padding:160px 0 96px;background:var(--bg)}
.hero-meta{font-size:12px;letter-spacing:.35em;color:#C4A882;text-transform:uppercase;margin-bottom:40px}
.hero-headline{font-family:var(--serif);font-size:48px;font-weight:700;color:var(--dark);line-height:1.35;margin-bottom:32px;max-width:700px}
.hero-body{font-size:16px;line-height:2.2;color:#7A6550;max-width:600px;margin-bottom:36px}
.hero-slogan-row{margin-bottom:40px}
.hero-slogan-text{font-family:var(--serif);font-size:20px;font-weight:600;color:var(--primary);letter-spacing:.12em;margin-bottom:4px}
.hero-slogan-en{font-size:14px;color:#7A6550;letter-spacing:.04em}
.hero-btns{display:flex;gap:16px}
.btn-accent{display:inline-block;padding:14px 36px;border-radius:6px;font-size:14px;font-weight:500;font-family:var(--sans);background:var(--primary);color:var(--white);border:none;cursor:pointer;transition:all var(--transition);letter-spacing:.05em}
.btn-accent:hover{background:var(--primary-dark);transform:translateY(-1px);box-shadow:0 6px 20px rgba(184,98,27,.2)}
.btn-ghost{display:inline-block;padding:14px 36px;border-radius:6px;font-size:14px;font-weight:500;font-family:var(--sans);background:transparent;color:var(--dark);border:1.5px solid rgba(74,44,23,.15);cursor:pointer;transition:all var(--transition);letter-spacing:.05em}
.btn-ghost:hover{border-color:var(--primary);color:var(--primary)}

/* ============ STATS ============ */
.stats-dark{padding:72px 48px;background:#F0E6D8;border-radius:20px;max-width:var(--wide);margin:48px auto}
.stats-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:40px 0}
.sd-item{text-align:center;padding:16px 0}
.sd-num{font-family:var(--serif);font-size:48px;font-weight:700;color:var(--primary);line-height:1}
.sd-num small{font-size:28px;vertical-align:top;margin-left:2px}
.sd-label{display:block;font-size:13px;color:#7A6550;margin-top:10px;letter-spacing:.06em;font-weight:400}

/* ============ BIG QUOTE ============ */
.big-quote{padding:96px 0;background:var(--bg)}
.bq-text{font-family:var(--serif);font-size:36px;font-weight:700;color:var(--dark);line-height:1.5;margin-bottom:40px;max-width:700px}
.bq-body{font-size:16px;line-height:2.2;color:#7A6550;max-width:680px}

/* ============ TIMELINE ============ */
.timeline-section{padding:80px 0;background:var(--bg)}
.tl-block{border-left:3px solid var(--primary);padding-left:32px;max-width:680px}
.tl-year{font-family:var(--serif);font-size:32px;font-weight:700;color:var(--primary);display:block;margin-bottom:16px}
.tl-text{font-size:16px;line-height:2.2;color:#7A6550}

/* ============ PROGRAMS ============ */
.programs-dark{padding:96px 48px;background:#F0E6D8;border-radius:20px;max-width:var(--wide);margin:48px auto}
.pd-tag{font-size:12px;letter-spacing:.3em;color:#C4A882;text-transform:uppercase;margin-bottom:16px}
.pd-title{font-family:var(--serif);font-size:32px;font-weight:700;color:var(--dark);margin-bottom:48px}
.pd-cards{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.pd-card{display:block;padding:36px 28px;background:var(--white);border:1px solid rgba(212,165,116,.1);border-radius:12px;transition:all var(--transition)}
.pd-card:hover{box-shadow:var(--shadow);transform:translateY(-3px)}
.pd-icon{width:40px;height:40px;margin-bottom:20px;color:var(--primary)}
.pd-icon svg{width:24px;height:24px}
.pd-card h3{font-family:var(--serif);font-size:18px;font-weight:600;color:var(--dark);margin-bottom:14px;letter-spacing:.03em}
.pd-card p{font-size:14px;line-height:2;color:#7A6550}

/* ============ CLOSING CTA ============ */
.closing-cta{padding:96px 0;background:var(--bg);text-align:center}
.cc-lead{font-size:16px;color:#7A6550;margin-bottom:12px;letter-spacing:.05em}
.cc-title{font-family:var(--serif);font-size:36px;font-weight:700;color:var(--dark);margin-bottom:40px;letter-spacing:.06em}

/* ============ TEAM GRID ============ */
.team-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.team-card{text-align:center;padding:32px 20px;background:var(--bg);border-radius:var(--radius);border:1px solid rgba(212,165,116,.08);transition:all var(--transition)}
.team-card:hover{box-shadow:var(--shadow-sm);transform:translateY(-2px)}
.team-avatar{width:80px;height:80px;margin:0 auto 16px;border-radius:50%;background:linear-gradient(135deg,rgba(184,98,27,.1),rgba(212,165,116,.15))}
.team-card h4{font-family:var(--serif);font-size:16px;font-weight:600;color:var(--dark);margin-bottom:4px}
.team-role{font-size:12px;color:var(--secondary);letter-spacing:.05em}

/* ============ PAGE HERO — same style as homepage hero ============ */
.page-hero{padding:160px 0 64px;background:var(--bg)}

/* ============ ABOUT PAGE ============ */
.story-section{padding:80px 0}
.story-text{max-width:720px;margin:0 auto}
.story-text p{font-size:16px;line-height:2.2;color:#7A6550;margin-bottom:16px}
.story-text p.lead{font-size:17px;color:var(--dark);font-weight:400}
.story-text h3{font-family:var(--serif);font-size:28px;font-weight:700;color:var(--dark);margin:32px 0 16px}
.core-block{text-align:center;padding:48px 40px;margin:32px 0;background:#F0E6D8;border-radius:var(--radius)}
.core-block blockquote p{font-family:var(--serif);font-size:28px;font-weight:700;color:var(--dark);letter-spacing:.08em;line-height:1.6}
.core-block .sub{font-size:15px;color:#7A6550;margin-top:16px;letter-spacing:.03em}
.trust-block{text-align:center;padding:48px 40px;margin:32px auto;background:#F0E6D8;border-radius:20px;max-width:var(--wide)}
.trust-block .lead{font-size:16px;color:#7A6550;margin-bottom:16px;letter-spacing:.05em}
.trust-block .word{font-family:var(--serif);font-size:56px;font-weight:700;color:var(--primary);letter-spacing:.3em;margin-bottom:32px}
.trust-block .desc{font-size:16px;line-height:2.4;color:#7A6550;max-width:640px;margin:0 auto}
.closing-block{text-align:center;padding:48px;background:var(--bg)}
.closing-block .vision{font-size:16px;line-height:2.4;color:#7A6550;max-width:640px;margin:0 auto 48px}
.closing-block .closing{font-family:var(--serif);font-size:24px;font-weight:700;color:var(--dark);letter-spacing:.08em;line-height:2}

/* ============ PROGRAMS PAGE ============ */
.program-section{padding:80px 0;border-bottom:1px solid rgba(212,165,116,.08)}
.program-section:last-of-type{border-bottom:none}
.program-header{margin-bottom:32px}
.program-header .badge{display:inline-block;padding:4px 16px;background:rgba(184,98,27,.06);border-radius:20px;font-size:12px;color:var(--primary);font-weight:500;margin-bottom:14px}
.program-header h2{font-family:var(--serif);font-size:28px;font-weight:700;color:var(--dark);letter-spacing:.05em}
.program-body p{font-size:15px;line-height:2.2;color:#7A6550;max-width:720px;margin-bottom:32px}
.poster-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin-top:32px}
.poster-grid img{width:100%;height:320px;object-fit:cover;object-position:top;border-radius:var(--radius-sm);box-shadow:var(--shadow-sm);transition:transform var(--transition)}
.poster-grid img:hover{transform:translateY(-4px)}
.program-photo{border-radius:var(--radius);overflow:hidden;margin-top:32px;max-height:400px}
.program-photo img{width:100%;height:400px;object-fit:cover}

/* ============ COMMUNITY PAGE — Masonry Gallery ============ */
.gallery-grid{columns:3;column-gap:16px}
.gallery-item{break-inside:avoid;margin-bottom:16px;border-radius:var(--radius-sm);overflow:hidden;box-shadow:var(--shadow-sm)}
.gallery-item img{width:100%;display:block;transition:transform .6s ease}
.gallery-item:hover img{transform:scale(1.03)}

/* ============ JOIN PAGE ============ */
.join-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;margin-bottom:64px}
.join-card{padding:40px 32px;background:var(--bg);border-radius:var(--radius);border:1px solid rgba(212,165,116,.08);text-align:center;transition:all var(--transition)}
.join-card:hover{box-shadow:var(--shadow-sm);transform:translateY(-2px)}
.join-icon{width:52px;height:52px;margin:0 auto 20px;display:flex;align-items:center;justify-content:center;border-radius:14px;background:rgba(184,98,27,.08);color:var(--primary)}
.join-icon svg{width:26px;height:26px}
.join-card h3{font-family:var(--serif);font-size:20px;font-weight:700;color:var(--dark);margin-bottom:12px}
.join-card p{font-size:15px;line-height:2;color:#7A6550}
.join-cta{text-align:center;padding:48px;background:linear-gradient(135deg,var(--cream),var(--bg));border-radius:var(--radius)}
.join-cta p{font-family:var(--serif);font-size:22px;font-weight:600;color:var(--dark);margin-bottom:28px;letter-spacing:.05em}

/* ============ FOOTER ============ */
.footer{background:var(--bg);border-top:1px solid rgba(212,165,116,.12);padding:64px 0 32px}
.footer-main{display:flex;justify-content:space-between;align-items:start;margin-bottom:48px}
.footer-logo{height:84px;width:auto;margin-bottom:20px;opacity:.9}
.footer-slogan{font-family:var(--serif);font-size:18px;color:var(--dark);letter-spacing:.15em;margin-bottom:8px}
.footer-org{font-size:14px;color:#C4A882}
.footer-links{display:flex;gap:64px}
.footer-col h4{font-size:16px;font-weight:600;color:var(--dark);margin-bottom:16px;letter-spacing:.05em}
.footer-col li{margin-bottom:12px}
.footer-col a{font-size:15px;color:#7A6550}
.footer-col a:hover{color:var(--primary)}
.footer-bottom{padding-top:24px;border-top:1px solid rgba(212,165,116,.1);text-align:center}
.footer-bottom p{font-size:13px;color:#C4A882}

/* ============ ANIMATIONS ============ */
.fade-up{opacity:0;transform:translateY(32px);transition:opacity .7s ease,transform .7s ease}
.fade-up.visible{opacity:1;transform:translateY(0)}

/* ============ RESPONSIVE ============ */
@media(max-width:1024px){
  .container,.container-wide{padding:0 32px}
  .nav-container{padding:0 32px}
  .hero-stats{gap:32px}
}
@media(max-width:768px){
  .container,.container-wide{padding:0 20px}
  .nav-container{padding:0 20px}
  .section{padding:56px 0}
  /* Mobile nav */
  .nav-toggle{display:flex}
  .nav-logo img{height:68px}
  .nav-links{display:none;position:absolute;top:100%;left:0;right:0;flex-direction:column;background:rgba(255,252,248,.98);backdrop-filter:blur(20px);padding:24px;gap:0;box-shadow:0 16px 32px rgba(74,44,23,.08)}
  .nav-links.open{display:flex}
  .nav-links li{padding:12px 0;border-bottom:1px solid var(--cream)}
  .nav-links li:last-child{border-bottom:none}
  .nav-links a{font-size:16px}
  /* Hero */
  .hero-v2,.page-hero{padding:100px 0 40px}
  .hero-meta{font-size:10px;letter-spacing:.25em;margin-bottom:24px}
  .hero-headline{font-size:28px;margin-bottom:20px}
  .hero-body{font-size:15px;line-height:2;margin-bottom:24px}
  .hero-slogan-text{font-size:17px}
  .hero-slogan-en{font-size:13px}
  .hero-slogan-row{margin-bottom:28px}
  .hero-btns{gap:12px}
  .btn-accent,.btn-ghost{padding:12px 28px;font-size:13px}
  /* Stats */
  .stats-dark{padding:48px 24px;border-radius:16px;margin:32px auto}
  .stats-grid{grid-template-columns:repeat(2,1fr);gap:20px}
  .sd-num{font-size:32px}
  .sd-label{font-size:12px;margin-top:6px}
  /* Quote */
  .bq-text{font-size:22px;margin-bottom:24px}
  .bq-body{font-size:15px}
  /* Timeline */
  .tl-year{font-size:24px}
  .tl-text{font-size:15px}
  .tl-block{padding-left:20px}
  /* Programs */
  .programs-dark{padding:56px 24px;border-radius:16px;margin:32px auto}
  .pd-tag{font-size:11px}
  .pd-title{font-size:22px;margin-bottom:32px}
  .pd-cards{grid-template-columns:1fr;gap:16px}
  .pd-card{padding:28px 24px}
  .pd-card h3{font-size:16px}
  .pd-card p{font-size:13px}
  /* Closing */
  .cc-lead{font-size:14px}
  .cc-title{font-size:24px}
  /* Section titles */
  .section-title{font-size:24px}
  .section-subtitle{font-size:14px}
  /* About page */
  .story-text p{font-size:15px;line-height:2.2}
  .story-text p.lead{font-size:16px}
  .story-text h3{font-size:22px;margin:36px 0 16px}
  .core-block{padding:48px 24px}
  .core-block blockquote p{font-size:22px}
  .core-block .sub{font-size:14px}
  .trust-block{padding:56px 24px}
  .trust-block .word{font-size:36px;letter-spacing:.2em}
  .trust-block .lead{font-size:14px}
  .trust-block .desc{font-size:14px}
  /* Join */
  .join-grid{grid-template-columns:1fr}
  .join-card{padding:32px 24px}
  .join-card h3{font-size:18px}
  .join-card p{font-size:14px}
  .join-cta{padding:36px 24px}
  .join-cta p{font-size:18px}
  /* Poster */
  .poster-grid{grid-template-columns:1fr 1fr}
  .poster-grid img{height:220px}
  /* Footer */
  .footer{padding:48px 0 24px}
  .footer-main{flex-direction:column;gap:28px}
  .footer-logo{height:64px}
  .footer-slogan{font-size:15px}
  .footer-org{font-size:12px}
  .footer-col h4{font-size:14px}
  .footer-col a{font-size:14px}
  .footer-links{gap:40px}
}
@media(max-width:480px){
  .hero-headline{font-size:24px}
  .hero-body{font-size:14px}
  .sd-num{font-size:28px}
  .bq-text{font-size:20px}
  .pd-title{font-size:20px}
  .cc-title{font-size:22px}
  .poster-grid{grid-template-columns:1fr}
  .poster-grid img{height:auto}
  .stats-grid{grid-template-columns:repeat(2,1fr);gap:16px}
}