:root{--primary-color:#0071e3;--secondary-color:#873be0;--accent-color:#f5f5f7;--text-dark:#1d1d1f;--text-light:#6e6e73;--bg-light:#e87ed5;--bg-light-middle:#e0dbfb;--bg-light-gradient:#85cff5;--card-bg:#ffffff;--border-color:#e5e5e7;--shadow-light:rgba(0,0,0,0.1);--shadow-light-hover:rgba(0,0,0,0.15);--footer-bg:#1d1d1f;--footer-border:#2d2d2d;--success-color:#10b981;--error-color:#ef4444;--text-button-bg:#eeeeee;--text-button-bg-hover:#dddddd;--text-button-text:#1d1d1f}[data-theme=dark]{--primary-color:#0071e3;--secondary-color:#873be0;--accent-color:#2d2d2d;--text-dark:#f5f5f7;--text-light:#a1a1a6;--bg-light:#4d4d4e;--bg-light-middle:#3a3a66;--bg-light-gradient:#04046f;--card-bg:#2d2d2d;--border-color:#3a3a3c;--shadow-light:rgba(0,0,0,0.3);--shadow-light-hover:rgba(0,0,0,0.4);--footer-bg:#1d1d1f;--footer-border:#3a3a3c;--text-button-bg:#4d4d4d;--text-button-bg-hover:#999797;--text-button-text:#e6e6ea}*{box-sizing:border-box}html{min-height:100%}body{min-height:100vh;margin:0;background:linear-gradient(45deg,var(--bg-light) 0,var(--bg-light-middle) 50%,var(--bg-light-gradient) 100%);color:var(--text-dark);font-family:Inter,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;transition:background .3s ease,color .3s ease}a{color:inherit}button,input{font:inherit}.site-header{background:linear-gradient(135deg,var(--primary-color) 0,var(--secondary-color) 100%);box-shadow:0 8px 32px var(--shadow-light);color:#ffffff}.site-header__inner{width:min(1120px,calc(100% - 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32px));margin:0 auto;padding:48px 0}.content-card{margin:0 0 24px;padding:28px;border:1px solid var(--border-color);border-radius:8px;background:var(--card-bg);box-shadow:0 8px 32px var(--shadow-light)}.content-card h1,.content-card h2,.content-card h3{margin-top:0}.content-card h1{text-align:center;font-size:clamp(2rem,5vw,3rem);letter-spacing:0}.lead-copy{max-width:680px;margin:0 auto 28px;color:var(--text-light);text-align:center;font-size:1.1rem;line-height:1.65}.legal-page .content-card section{margin-top:28px}.legal-page .content-card p{color:var(--text-light);line-height:1.7}.contact-layout,.feature-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));grid-gap:18px;gap:18px}.contact-aside article,.feature-grid article,.tip-list article{padding:18px;border:1px solid var(--border-color);border-radius:8px;background:var(--accent-color)}.contact-aside li,.contact-aside p,.feature-grid p,.step-item p,.tip-list p{color:var(--text-light);line-height:1.6}.step-list,.tip-list{display:grid;grid-gap:16px;gap:16px}.step-item{display:grid;grid-template-columns:44px minmax(0,1fr);grid-gap:16px;gap:16px;align-items:start}.step-item span{display:grid;width:44px;height:44px;place-items:center;border-radius:50%;background:var(--primary-color);color:#ffffff;font-weight:800}.contact-layout{grid-template-columns:minmax(260px,.8fr) minmax(0,1.2fr)}.contact-aside,.contact-form{display:grid;grid-gap:16px;gap:16px}.contact-aside ul{margin:0;padding-left:20px}.form-group{display:grid;grid-gap:8px;gap:8px}.form-label{color:var(--text-dark);font-weight:700}.form-input{width:100%;padding:14px 16px;border:2px solid var(--border-color);border-radius:8px;outline:none;background:var(--card-bg);color:var(--text-dark);transition:border-color .2s ease}.form-input:focus{border-color:var(--primary-color)}.form-textarea{min-height:140px;resize:vertical}.submit-btn{min-height:48px;border:0;border-radius:8px;background:var(--primary-color);color:#ffffff;cursor:pointer;font-weight:800}.submit-btn:disabled{cursor:not-allowed;opacity:.65}.form-message{margin:0;padding:12px 14px;border-radius:8px;color:#ffffff}.form-message--success{background:var(--success-color)}.form-message--error{background:var(--error-color)}.form-message--submitting{background:var(--primary-color)}@media (max-width:768px){.site-header__inner{min-height:58px}.logo{font-size:1.5rem}.site-nav{gap:14px;font-size:.95rem}.site-footer__inner{min-height:96px;flex-direction:column;align-items:flex-start;justify-content:center}.page-shell{padding-top:48px}.hero-section h1{font-size:clamp(2.6rem,14vw,4.25rem)}.search-panel{padding:24px 0}.search-row{flex-direction:column}.search-button{width:100%}.keyword-page{padding-top:40px}.keyword-layout,.keyword-seo-summary dl,.word-info-grid{grid-template-columns:1fr}.example-item{grid-template-columns:86px minmax(0,1fr)}.learning-controls{grid-template-columns:repeat(2,minmax(0,1fr))}.content-card{padding:22px}.contact-layout,.feature-grid{grid-template-columns:1fr}}