:root{--font-body:"Montserrat", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;--font-heading:"Bai Jamjuree", -apple-system, BlinkMacSystemFont, sans-serif;--bg-color:#fff9f4;--card-bg:#fff;--text-primary:#1c1c1c;--text-secondary:#6b655f;--accent-color:#c44903;--accent-hover:#a63b00;--accent-light:#fff0e6;--border-color:#e8e2d9;--input-bg:#fafaf8;--bg-secondary:#f7f4ef;--error-color:#d9381e;--success-color:#2e7d32;--card-shadow:0 20px 40px #1c1c1c0f, 0 2px 8px #1c1c1c08}*{box-sizing:border-box;margin:0;padding:0}body{font-family:var(--font-body);background-color:var(--bg-color);color:var(--text-primary);-webkit-font-smoothing:antialiased;width:100%;min-height:100vh;line-height:1.6;position:relative;overflow-x:hidden}h1,h2,h3,h4,h5,h6{font-family:var(--font-heading);color:var(--text-primary);letter-spacing:-.01em;font-weight:600}.app-container{flex-direction:column;min-height:100vh;display:flex}.header-container,.hero-content,.container,.footer-container{width:100%;max-width:1440px;margin:0 auto;padding:0 24px}.app-header{border-bottom:1px solid var(--border-color);z-index:50;background:#fff;padding:20px 0;position:sticky;top:0;box-shadow:0 2px 10px #1c1c1c08}.header-container{justify-content:space-between;align-items:center;display:flex}.logo{font-family:var(--font-heading);letter-spacing:.04em;color:var(--text-primary);font-size:1.25rem;font-weight:700}.main-nav{gap:32px;display:flex}.main-nav a{color:var(--text-secondary);font-size:.95rem;font-weight:500;text-decoration:none;transition:color .2s}.main-nav a:hover{color:var(--accent-color)}@media (width<=768px){.main-nav{display:none}}.hero-section{text-align:center;padding:60px 0 40px}.hero-content h1{color:var(--text-primary);letter-spacing:-.02em;margin-bottom:16px;font-size:3rem;font-weight:700}.hero-content p{color:var(--text-secondary);max-width:620px;margin:0 auto;font-size:1.15rem}@media (width<=768px){.hero-section{padding:40px 0 24px}.hero-content h1{font-size:2.2rem}.hero-content p{font-size:1rem}}.calculator-section{flex-grow:1;padding-top:16px;padding-bottom:80px}#sauna-calculator-root{width:100%;max-width:1440px;margin:0 auto;padding:0 24px}@keyframes fadeInUp{0%{opacity:0;transform:translateY(16px)}to{opacity:1;transform:translateY(0)}}.fade-in-up{animation:.6s cubic-bezier(.16,1,.3,1) forwards fadeInUp}.calculator-card{background:var(--card-bg);border:1px solid var(--border-color);box-shadow:var(--card-shadow);border-radius:20px;width:100%;padding:44px}@media (width<=768px){.calculator-card{border-radius:16px;padding:28px 20px}}.form-grid{grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:28px;margin-bottom:28px;display:grid}@media (width<=768px){.form-grid{grid-template-columns:1fr;gap:20px;margin-bottom:20px}}.form-group{flex-direction:column;display:flex}.form-group label{color:var(--text-primary);text-transform:uppercase;letter-spacing:.05em;font-size:.825rem;font-weight:600;font-family:var(--font-body);margin-bottom:8px}.input-wrapper{align-items:center;display:flex;position:relative}.input-wrapper input,.input-wrapper select{background:var(--input-bg);border:1px solid var(--border-color);width:100%;color:var(--text-primary);font-size:1rem;font-family:var(--font-body);border-radius:10px;outline:none;padding:13px 16px;transition:all .2s}.input-wrapper input:focus,.input-wrapper select:focus{border-color:var(--accent-color);background:#fff;box-shadow:0 0 0 3px #c4490326}.toggle-group{gap:10px;margin-top:6px;display:flex}.toggle-btn{background:var(--bg-secondary);border:1px solid var(--border-color);color:var(--text-secondary);cursor:pointer;font-size:.9rem;font-weight:600;font-family:var(--font-body);border-radius:10px;flex:1;padding:12px;transition:all .25s cubic-bezier(.16,1,.3,1)}.toggle-btn:hover:not(.active){color:var(--text-primary);background:#efeae2}.toggle-btn.active{background:var(--accent-color);color:#fff;border-color:var(--accent-color);box-shadow:0 4px 14px #c4490340}.brand-tab-btn{box-shadow:none!important;background:0 0!important;border-color:#0000!important}.brand-tab-btn:hover:not(.active){background:#f8f8f8!important}.brand-tab-btn.active{border-width:2px;background:#fff!important;border-color:#ddd!important;box-shadow:0 4px 14px #0000000d!important}.calculator-content{grid-template-columns:1fr 1fr;align-items:start;gap:44px;display:grid}@media (width<=992px){.calculator-content{grid-template-columns:1fr;gap:36px}}.calculator-form-section{flex-direction:column;display:flex}.calculator-results-section{background:var(--bg-secondary);border:1px solid var(--border-color);text-align:center;border-radius:16px;flex-direction:column;align-items:stretch;padding:36px 28px;display:flex;position:relative;overflow:hidden}.results-section h3{color:var(--text-secondary);font-size:1.2rem;font-family:var(--font-heading);margin-bottom:12px}.kw-result{color:var(--accent-color);font-size:3.75rem;font-weight:700;font-family:var(--font-heading);letter-spacing:-.02em;margin-bottom:24px}.recommendations{flex-direction:column;gap:20px;margin-top:12px;display:flex}.rec-card{text-align:left;border-top:1px solid var(--border-color);padding-top:24px}.rec-title{font-family:var(--font-heading);color:var(--text-primary);vertical-align:middle;margin-left:10px;font-size:1.35rem;font-weight:600;display:inline-block}.rec-icon{width:26px;height:26px;color:var(--accent-color);vertical-align:middle}.rec-item{border:1px solid var(--border-color);background:#fff;border-radius:12px;align-items:center;gap:16px;padding:16px;transition:transform .2s,box-shadow .2s,border-color .2s;display:flex;box-shadow:0 4px 12px #1c1c1c08}.rec-item:hover{border-color:var(--accent-color);transform:translateY(-2px);box-shadow:0 8px 24px #c449031f}.app-footer{border-top:1px solid var(--border-color);text-align:center;color:var(--text-secondary);background:#fff;padding:36px 0;font-size:.9rem}