/* ===== TSSTA - Society for Scientific and Technological Advancement =====
   Custom Static Website | Clean Modern Design
   ================================================================== */

/* Google Fonts */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&family=Merriweather:wght@400;700&display=swap');

/* ===== CSS RESET & ROOT VARIABLES ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --navy:      #0a1f44;
  --blue:      #1a3c8f;
  --accent:    #2563eb;
  --accent-lt: #3b82f6;
  --teal:      #0ea5e9;
  --gold:      #f59e0b;
  --white:     #ffffff;
  --off-white: #f8fafc;
  --gray-100:  #f1f5f9;
  --gray-200:  #e2e8f0;
  --gray-400:  #94a3b8;
  --gray-600:  #475569;
  --gray-800:  #1e293b;
  --text:      #1e293b;
  --text-lt:   #475569;
  --radius:    8px;
  --radius-lg: 16px;
  --shadow-sm: 0 1px 3px rgba(0,0,0,.08), 0 1px 2px rgba(0,0,0,.06);
  --shadow:    0 4px 6px rgba(0,0,0,.07), 0 2px 4px rgba(0,0,0,.06);
  --shadow-lg: 0 10px 15px rgba(0,0,0,.08), 0 4px 6px rgba(0,0,0,.05);
  --shadow-xl: 0 20px 25px rgba(0,0,0,.1), 0 10px 10px rgba(0,0,0,.04);
  --transition: .25s ease;
  --max-w: 1160px;
}

html { scroll-behavior: smooth; font-size: 16px; }
body { font-family: 'Inter', system-ui, -apple-system, sans-serif; color: var(--text); background: var(--white); line-height: 1.6; -webkit-font-smoothing: antialiased; }
img { max-width: 100%; height: auto; display: block; }
a { color: var(--accent); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--navy); }
ul { list-style: none; }
h1,h2,h3,h4,h5 { font-family: 'Merriweather', Georgia, serif; line-height: 1.3; color: var(--navy); }
p { margin-bottom: 1rem; }
p:last-child { margin-bottom: 0; }

/* ===== UTILITIES ===== */
.container { max-width: var(--max-w); margin: 0 auto; padding: 0 24px; }
.section { padding: 80px 0; }
.section-sm { padding: 48px 0; }
.text-center { text-align: center; }
.text-white { color: var(--white) !important; }
.bg-navy { background: var(--navy); }
.bg-off-white { background: var(--off-white); }
.bg-gradient { background: linear-gradient(135deg, var(--navy) 0%, var(--blue) 60%, var(--accent) 100%); }

/* Section heading */
.section-label { font-size: .75rem; font-weight: 700; letter-spacing: .12em; text-transform: uppercase; color: var(--teal); margin-bottom: .5rem; font-family: 'Inter', sans-serif; }
.section-title { font-size: clamp(1.6rem, 3vw, 2.4rem); margin-bottom: 1rem; }
.section-subtitle { font-size: 1.05rem; color: var(--text-lt); max-width: 640px; }
.section-header { margin-bottom: 48px; }
.section-header.center { text-align: center; }
.section-header.center .section-subtitle { margin: 0 auto; }

/* ===== BUTTONS ===== */
.btn { display: inline-flex; align-items: center; gap: 8px; padding: 12px 28px; border-radius: var(--radius); font-weight: 600; font-size: .95rem; border: 2px solid transparent; cursor: pointer; transition: all var(--transition); font-family: inherit; text-decoration: none; white-space: nowrap; }
.btn-primary { background: var(--accent); color: var(--white); border-color: var(--accent); }
.btn-primary:hover { background: var(--navy); border-color: var(--navy); color: var(--white); transform: translateY(-1px); box-shadow: var(--shadow-lg); }
.btn-outline { background: transparent; color: var(--white); border-color: rgba(255,255,255,.6); }
.btn-outline:hover { background: var(--white); color: var(--navy); border-color: var(--white); }
.btn-gold { background: var(--gold); color: var(--navy); border-color: var(--gold); }
.btn-gold:hover { background: #d97706; border-color: #d97706; color: var(--white); transform: translateY(-1px); }
.btn-lg { padding: 16px 36px; font-size: 1.05rem; }
.btn-sm { padding: 8px 18px; font-size: .875rem; }

/* ===== HEADER / NAV ===== */
.site-header { position: sticky; top: 0; z-index: 1000; background: var(--white); border-bottom: 1px solid var(--gray-200); box-shadow: var(--shadow-sm); }
.nav-inner { display: flex; align-items: center; justify-content: space-between; height: 72px; gap: 24px; }
.nav-logo { display: flex; align-items: center; gap: 12px; flex-shrink: 0; }
.nav-logo img { height: 52px; width: auto; }
.nav-logo-text { display: flex; flex-direction: column; line-height: 1.2; }
.nav-logo-text strong { font-size: 1.1rem; font-weight: 800; color: var(--navy); font-family: 'Merriweather', serif; }
.nav-logo-text span { font-size: .65rem; letter-spacing: .06em; text-transform: uppercase; color: var(--text-lt); font-weight: 500; }
.nav-menu { display: flex; align-items: center; gap: 4px; }
.nav-item { position: relative; }
.nav-link { display: flex; align-items: center; gap: 4px; padding: 8px 14px; font-size: .9rem; font-weight: 600; color: var(--gray-800); border-radius: var(--radius); transition: all var(--transition); white-space: nowrap; }
.nav-link:hover, .nav-link.active { background: var(--gray-100); color: var(--accent); }
.nav-link svg { width: 14px; height: 14px; opacity: .6; transition: transform var(--transition); }
.nav-item:hover .nav-link svg { transform: rotate(180deg); }
.nav-cta { margin-left: 8px; }
/* Dropdown */
.nav-dropdown { position: absolute; top: calc(100% + 8px); left: 0; background: var(--white); border: 1px solid var(--gray-200); border-radius: var(--radius-lg); box-shadow: var(--shadow-xl); min-width: 220px; padding: 8px; opacity: 0; visibility: hidden; transform: translateY(-8px); transition: all .2s ease; z-index: 100; }
.nav-item:hover .nav-dropdown { opacity: 1; visibility: visible; transform: translateY(0); }
.nav-dropdown a { display: block; padding: 10px 14px; font-size: .875rem; font-weight: 500; color: var(--text); border-radius: var(--radius); transition: all var(--transition); }
.nav-dropdown a:hover { background: var(--gray-100); color: var(--accent); padding-left: 18px; }
/* Mobile toggle */
.nav-toggle { display: none; flex-direction: column; gap: 5px; cursor: pointer; padding: 4px; }
.nav-toggle span { width: 24px; height: 2px; background: var(--navy); border-radius: 2px; transition: all var(--transition); display: block; }
.nav-toggle.open span:nth-child(1) { transform: rotate(45deg) translate(5px,5px); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: rotate(-45deg) translate(5px,-5px); }

/* ===== HERO ===== */
.hero { background: linear-gradient(135deg, var(--navy) 0%, var(--blue) 50%, #1e4db7 100%); color: var(--white); padding: 100px 0 80px; position: relative; overflow: hidden; }
.hero::before { content:''; position:absolute; inset:0; background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" width="60" height="60"><circle cx="30" cy="30" r="1" fill="rgba(255,255,255,.08)"/></svg>'); }
.hero-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center; position: relative; z-index: 1; }
.hero-label { display: inline-flex; align-items: center; gap: 8px; background: rgba(255,255,255,.12); border: 1px solid rgba(255,255,255,.2); padding: 6px 14px; border-radius: 999px; font-size: .78rem; font-weight: 600; letter-spacing: .08em; text-transform: uppercase; color: rgba(255,255,255,.9); margin-bottom: 20px; backdrop-filter: blur(4px); }
.hero-title { font-size: clamp(2rem, 4vw, 3.2rem); line-height: 1.15; color: var(--white); margin-bottom: 20px; }
.hero-title span { color: var(--teal); }
.hero-desc { font-size: 1.1rem; color: rgba(255,255,255,.8); margin-bottom: 36px; max-width: 520px; line-height: 1.7; }
.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; }
.hero-imgs { position: relative; }
.hero-imgs img { border-radius: var(--radius-lg); box-shadow: var(--shadow-xl); }
.hero-img-main { width: 100%; aspect-ratio: 4/3; object-fit: cover; }
.hero-img-badge { position: absolute; bottom: -20px; left: -20px; background: var(--white); border-radius: var(--radius-lg); padding: 16px 20px; box-shadow: var(--shadow-xl); display: flex; align-items: center; gap: 12px; }
.hero-img-badge strong { font-size: 1.4rem; color: var(--navy); }
.hero-img-badge span { font-size: .75rem; color: var(--text-lt); font-weight: 500; }

/* ===== STATS STRIP ===== */
.stats-strip { background: var(--navy); padding: 40px 0; }
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; text-align: center; }
.stat-item { padding: 8px; }
.stat-num { font-size: clamp(2rem, 4vw, 3rem); font-weight: 800; color: var(--white); font-family: 'Inter', sans-serif; line-height: 1; }
.stat-num span { color: var(--teal); }
.stat-label { font-size: .8rem; font-weight: 600; letter-spacing: .1em; text-transform: uppercase; color: rgba(255,255,255,.55); margin-top: 6px; }

/* ===== CARDS ===== */
.card { background: var(--white); border: 1px solid var(--gray-200); border-radius: var(--radius-lg); overflow: hidden; transition: all var(--transition); box-shadow: var(--shadow-sm); }
.card:hover { box-shadow: var(--shadow-xl); transform: translateY(-4px); border-color: var(--accent-lt); }
.card-img { width: 100%; aspect-ratio: 16/9; object-fit: cover; }
.card-body { padding: 24px; }
.card-tag { font-size: .72rem; font-weight: 700; letter-spacing: .1em; text-transform: uppercase; color: var(--teal); margin-bottom: 8px; }
.card-title { font-size: 1.1rem; color: var(--navy); margin-bottom: 10px; }
.card-desc { font-size: .9rem; color: var(--text-lt); }
.card-link { display: inline-flex; align-items: center; gap: 6px; font-size: .875rem; font-weight: 600; color: var(--accent); margin-top: 16px; }
.card-link:hover { gap: 10px; }

/* Grid layouts */
.grid-2 { display: grid; grid-template-columns: repeat(2,1fr); gap: 32px; }
.grid-3 { display: grid; grid-template-columns: repeat(3,1fr); gap: 32px; }
.grid-4 { display: grid; grid-template-columns: repeat(4,1fr); gap: 24px; }

/* ===== FEATURE BOXES (Home quick links) ===== */
.feature-box { display: flex; flex-direction: column; background: var(--white); border: 1px solid var(--gray-200); border-radius: var(--radius-lg); padding: 32px 28px; transition: all var(--transition); box-shadow: var(--shadow-sm); }
.feature-box:hover { box-shadow: var(--shadow-xl); transform: translateY(-4px); border-color: var(--accent); }
.feature-icon { width: 52px; height: 52px; border-radius: var(--radius); background: linear-gradient(135deg, var(--accent) 0%, var(--teal) 100%); display: flex; align-items: center; justify-content: center; margin-bottom: 20px; flex-shrink: 0; }
.feature-icon svg { width: 26px; height: 26px; color: var(--white); }
.feature-box h3 { font-size: 1.1rem; color: var(--navy); margin-bottom: 10px; }
.feature-box p { font-size: .9rem; color: var(--text-lt); flex-grow: 1; margin-bottom: 20px; }
.feature-box a.btn-sm { margin-top: auto; align-self: flex-start; }

/* ===== MEMBERS GRID ===== */
.member-card { background: var(--white); border: 1px solid var(--gray-200); border-radius: var(--radius-lg); padding: 28px 24px; text-align: center; transition: all var(--transition); box-shadow: var(--shadow-sm); }
.member-card:hover { box-shadow: var(--shadow-xl); transform: translateY(-4px); border-color: var(--accent-lt); }
.member-photo { width: 100px; height: 100px; border-radius: 50%; object-fit: cover; margin: 0 auto 16px; border: 4px solid var(--gray-100); }
.member-photo-placeholder { width: 100px; height: 100px; border-radius: 50%; background: linear-gradient(135deg,var(--accent),var(--teal)); display: flex; align-items: center; justify-content: center; margin: 0 auto 16px; }
.member-photo-placeholder span { color: white; font-size: 2rem; font-weight: 700; font-family: 'Inter', sans-serif; }
.member-name { font-size: 1rem; font-weight: 700; color: var(--navy); margin-bottom: 4px; font-family: 'Inter', sans-serif; }
.member-id { font-size: .72rem; font-weight: 600; letter-spacing: .08em; text-transform: uppercase; color: var(--teal); margin-bottom: 8px; background: var(--gray-100); padding: 3px 10px; border-radius: 999px; display: inline-block; }
.member-role { font-size: .85rem; color: var(--text-lt); line-height: 1.4; }

/* ===== FAQ ===== */
.faq-item { border: 1px solid var(--gray-200); border-radius: var(--radius); margin-bottom: 12px; overflow: hidden; }
.faq-question { width: 100%; text-align: left; padding: 20px 24px; background: none; border: none; cursor: pointer; display: flex; justify-content: space-between; align-items: center; font-size: .95rem; font-weight: 600; color: var(--navy); font-family: inherit; transition: background var(--transition); }
.faq-question:hover { background: var(--gray-100); }
.faq-question svg { width: 20px; height: 20px; color: var(--accent); transition: transform var(--transition); flex-shrink: 0; }
.faq-question.open svg { transform: rotate(45deg); }
.faq-answer { display: none; padding: 0 24px 20px; font-size: .9rem; color: var(--text-lt); line-height: 1.7; }
.faq-answer.open { display: block; }

/* ===== PAGE HERO (Inner pages) ===== */
.page-hero { background: linear-gradient(135deg, var(--navy) 0%, var(--blue) 100%); color: var(--white); padding: 64px 0; text-align: center; }
.page-hero h1 { font-size: clamp(1.8rem, 3.5vw, 2.8rem); color: var(--white); margin-bottom: 12px; }
.page-hero p { font-size: 1.05rem; color: rgba(255,255,255,.75); max-width: 600px; margin: 0 auto; }
.breadcrumb { display: flex; align-items: center; justify-content: center; gap: 8px; font-size: .8rem; color: rgba(255,255,255,.55); margin-bottom: 20px; }
.breadcrumb a { color: rgba(255,255,255,.7); }
.breadcrumb a:hover { color: var(--white); }
.breadcrumb span { color: rgba(255,255,255,.4); }

/* ===== MEMBERSHIP TIER CARDS ===== */
.tier-card { border: 2px solid var(--gray-200); border-radius: var(--radius-lg); padding: 36px 32px; transition: all var(--transition); position: relative; overflow: hidden; background: var(--white); }
.tier-card::before { content: ''; position: absolute; top: 0; left: 0; right: 0; height: 4px; background: linear-gradient(90deg, var(--accent), var(--teal)); }
.tier-card.featured { border-color: var(--accent); box-shadow: var(--shadow-xl); }
.tier-card.featured::before { height: 6px; }
.tier-badge { display: inline-block; font-size: .72rem; font-weight: 700; letter-spacing: .1em; text-transform: uppercase; padding: 4px 12px; border-radius: 999px; background: linear-gradient(90deg, var(--accent), var(--teal)); color: var(--white); margin-bottom: 16px; }
.tier-title { font-size: 1.3rem; color: var(--navy); margin-bottom: 6px; }
.tier-abbr { font-size: .85rem; color: var(--text-lt); font-family: 'Inter', sans-serif; margin-bottom: 16px; }
.tier-desc { font-size: .9rem; color: var(--text-lt); margin-bottom: 24px; line-height: 1.6; }
.tier-features { list-style: none; margin-bottom: 28px; }
.tier-features li { display: flex; align-items: flex-start; gap: 10px; font-size: .875rem; color: var(--text); padding: 6px 0; border-bottom: 1px solid var(--gray-100); }
.tier-features li:last-child { border-bottom: none; }
.tier-features li svg { width: 16px; height: 16px; color: var(--teal); flex-shrink: 0; margin-top: 2px; }

/* ===== CONTACT ===== */
.contact-grid { display: grid; grid-template-columns: 1fr 1.6fr; gap: 60px; align-items: start; }
.contact-info h3 { font-size: 1.2rem; margin-bottom: 20px; }
.contact-info-item { display: flex; gap: 16px; margin-bottom: 24px; }
.contact-info-icon { width: 44px; height: 44px; background: var(--gray-100); border-radius: var(--radius); display: flex; align-items: center; justify-content: center; flex-shrink: 0; }
.contact-info-icon svg { width: 20px; height: 20px; color: var(--accent); }
.contact-info-text strong { display: block; font-size: .9rem; font-weight: 700; color: var(--navy); margin-bottom: 2px; }
.contact-info-text span { font-size: .875rem; color: var(--text-lt); }
.form-group { margin-bottom: 20px; }
.form-label { display: block; font-size: .875rem; font-weight: 600; color: var(--gray-800); margin-bottom: 6px; }
.form-input, .form-textarea, .form-select { width: 100%; padding: 12px 16px; border: 1.5px solid var(--gray-200); border-radius: var(--radius); font-size: .9rem; font-family: inherit; color: var(--text); background: var(--white); transition: border-color var(--transition); }
.form-input:focus, .form-textarea:focus, .form-select:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px rgba(37,99,235,.12); }
.form-textarea { min-height: 140px; resize: vertical; }

/* ===== AWARD CATEGORIES ===== */
.award-cat-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(180px,1fr)); gap: 12px; }
.award-cat { background: var(--gray-100); border: 1px solid var(--gray-200); border-radius: var(--radius); padding: 12px 16px; font-size: .875rem; font-weight: 500; color: var(--text); display: flex; align-items: center; gap: 8px; }
.award-cat svg { width: 16px; height: 16px; color: var(--gold); flex-shrink: 0; }

/* ===== INFO BOX ===== */
.info-box { background: linear-gradient(135deg, rgba(37,99,235,.07), rgba(14,165,233,.07)); border: 1px solid rgba(37,99,235,.15); border-radius: var(--radius-lg); padding: 28px 32px; margin: 32px 0; }
.info-box h4 { color: var(--navy); margin-bottom: 8px; font-size: 1rem; }
.info-box p { font-size: .9rem; color: var(--text-lt); margin: 0; }

/* ===== MEMBER PROFILE PAGE ===== */
.member-profile { max-width: 780px; margin: 0 auto; }
.member-cert { background: var(--white); border: 2px solid var(--gray-200); border-radius: var(--radius-lg); padding: 48px; text-align: center; box-shadow: var(--shadow-xl); position: relative; overflow: hidden; }
.member-cert::before { content:''; position: absolute; top:0; left:0; right:0; height:6px; background: linear-gradient(90deg, var(--navy), var(--accent), var(--teal)); }
.member-cert-logo { width: 80px; margin: 0 auto 24px; }
.member-cert-org { font-size: .75rem; font-weight: 700; letter-spacing: .15em; text-transform: uppercase; color: var(--text-lt); margin-bottom: 8px; font-family: 'Inter', sans-serif; }
.member-cert h2 { font-size: 1.4rem; color: var(--navy); margin-bottom: 24px; }
.member-cert-photo { width: 140px; height: 140px; border-radius: 50%; object-fit: cover; border: 6px solid var(--gray-100); margin: 0 auto 20px; box-shadow: var(--shadow-lg); }
.member-cert-name { font-size: 1.8rem; color: var(--navy); margin-bottom: 6px; }
.member-cert-id { font-size: .8rem; font-weight: 700; letter-spacing: .1em; text-transform: uppercase; color: var(--teal); background: var(--gray-100); padding: 6px 16px; border-radius: 999px; display: inline-block; margin-bottom: 16px; }
.member-cert-role { font-size: 1rem; color: var(--text-lt); margin-bottom: 8px; }
.member-cert-date { font-size: .8rem; color: var(--text-lt); margin-top: 24px; padding-top: 24px; border-top: 1px solid var(--gray-200); }
.member-cert-type { display: inline-flex; align-items: center; gap: 6px; background: linear-gradient(135deg, var(--navy), var(--accent)); color: white; padding: 6px 16px; border-radius: 999px; font-size: .78rem; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; margin-top: 12px; }

/* ===== FOOTER ===== */
.site-footer { background: var(--navy); color: rgba(255,255,255,.8); }
.footer-main { padding: 64px 0 48px; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 48px; }
.footer-brand img { height: 56px; width: auto; margin-bottom: 16px; filter: brightness(0) invert(1); }
.footer-brand-text { font-size: .85rem; color: rgba(255,255,255,.55); line-height: 1.7; margin-bottom: 20px; max-width: 280px; }
.footer-col h4 { font-size: .85rem; font-weight: 700; letter-spacing: .1em; text-transform: uppercase; color: var(--white); margin-bottom: 16px; font-family: 'Inter', sans-serif; }
.footer-col ul { list-style: none; }
.footer-col ul li { margin-bottom: 10px; }
.footer-col ul li a { font-size: .875rem; color: rgba(255,255,255,.6); transition: color var(--transition); }
.footer-col ul li a:hover { color: var(--white); }
.footer-address { font-size: .85rem; color: rgba(255,255,255,.55); line-height: 1.7; }
.footer-address strong { display: block; color: rgba(255,255,255,.8); margin-bottom: 4px; font-size: .8rem; text-transform: uppercase; letter-spacing: .08em; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,.1); padding: 24px 0; display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 12px; font-size: .8rem; color: rgba(255,255,255,.4); }
.footer-bottom a { color: rgba(255,255,255,.5); }
.footer-bottom a:hover { color: rgba(255,255,255,.8); }

/* ===== CTA BANNER ===== */
.cta-banner { background: linear-gradient(135deg, var(--accent) 0%, var(--teal) 100%); padding: 72px 0; text-align: center; color: var(--white); }
.cta-banner h2 { font-size: clamp(1.6rem, 3vw, 2.4rem); color: var(--white); margin-bottom: 16px; }
.cta-banner p { font-size: 1.1rem; color: rgba(255,255,255,.85); margin-bottom: 36px; max-width: 560px; margin-left: auto; margin-right: auto; }

/* ===== PROSE CONTENT ===== */
.prose h2 { font-size: 1.5rem; color: var(--navy); margin: 2rem 0 1rem; border-bottom: 2px solid var(--gray-100); padding-bottom: .5rem; }
.prose h3 { font-size: 1.15rem; color: var(--navy); margin: 1.5rem 0 .75rem; }
.prose p { color: var(--text-lt); line-height: 1.8; margin-bottom: 1.2rem; }
.prose ul, .prose ol { padding-left: 1.5rem; margin-bottom: 1.2rem; }
.prose li { color: var(--text-lt); margin-bottom: .5rem; }
.prose ul { list-style: disc; }
.prose ol { list-style: decimal; }
.prose strong { color: var(--text); }

/* ===== TABLE ===== */
.table-wrap { overflow-x: auto; border-radius: var(--radius); border: 1px solid var(--gray-200); }
table { width: 100%; border-collapse: collapse; }
th { background: var(--navy); color: var(--white); text-align: left; padding: 14px 16px; font-size: .875rem; font-weight: 600; }
td { padding: 13px 16px; border-bottom: 1px solid var(--gray-100); font-size: .875rem; color: var(--text); }
tr:last-child td { border-bottom: none; }
tr:nth-child(even) td { background: var(--off-white); }

/* ===== RESPONSIVE ===== */
@media (max-width: 1024px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .hero-grid { gap: 40px; }
  .contact-grid { grid-template-columns: 1fr; gap: 40px; }
}

@media (max-width: 768px) {
  .nav-menu { display: none; position: fixed; top: 72px; left: 0; right: 0; background: var(--white); border-bottom: 1px solid var(--gray-200); flex-direction: column; padding: 16px; gap: 4px; box-shadow: var(--shadow-lg); z-index: 999; }
  .nav-menu.open { display: flex; }
  .nav-dropdown { position: static; box-shadow: none; border: none; padding: 0 0 0 16px; opacity: 1; visibility: visible; transform: none; display: none; }
  .nav-item.open .nav-dropdown { display: block; }
  .nav-toggle { display: flex; }
  .nav-cta { display: none; }
  .hero-grid { grid-template-columns: 1fr; }
  .hero-imgs { display: none; }
  .hero { padding: 64px 0 56px; }
  .stats-grid { grid-template-columns: repeat(2,1fr); }
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .section { padding: 56px 0; }
  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
  .footer-bottom { flex-direction: column; text-align: center; }
}

@media (max-width: 480px) {
  .stats-grid { grid-template-columns: 1fr 1fr; }
  .hero-actions { flex-direction: column; }
  .btn-lg { width: 100%; justify-content: center; }
  .member-cert { padding: 32px 20px; }
}