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480px)}.container{max-width:1200px;margin:0 auto;padding:0 20px}h1,h2,h3,h4,h5,h6{line-height:1.2;margin-bottom:.5rem;color:var(--text-color)}h1{font-size:3rem;font-weight:700}h2{font-size:2rem;font-weight:600;margin-bottom:1.5rem}h3{font-size:1.5rem;font-weight:600}p{margin-bottom:1rem;line-height:1.8}a{color:var(--primary-color);text-decoration:none;transition:color .3s ease,opacity .3s ease}a:hover{opacity:.7}.btn{display:inline-block;padding:12px 24px;border:none;border-radius:6px;font-size:1rem;font-weight:600;cursor:pointer;transition:all .3s ease;text-decoration:none;text-align:center}.btn-primary{background-color:var(--primary-color);color:var(--bg-color)}.btn-primary:hover{background-color:var(--secondary-color);transform:translateY(-2px);box-shadow:0 4px 12px var(--card-shadow)}.btn-secondary{background-color:transparent;color:var(--primary-color);border:2px solid var(--primary-color)}.btn-secondary:hover{background-color:var(--primary-color);color:var(--bg-color)}.btn-large{padding:16px 32px;font-size:1.1rem}.btn-small{padding:8px 16px;font-size:.9rem}.form-group{margin-bottom:1.5rem}label{display:block;margin-bottom:.5rem;font-weight:500;color:var(--text-color)}input,textarea,select{width:100%;padding:10px 12px;border:1px solid var(--border-color);border-radius:4px;font-family:inherit;font-size:1rem;transition:border-color .3s ease,box-shadow .3s ease;background-color:var(--bg-color);color:var(--text-color)}input:focus,textarea:focus,select:focus{outline:none;border-color:var(--primary-color);box-shadow:0 0 0 3px var(--card-shadow)}textarea{resize:vertical}.loading-container{display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:400px;padding:2rem}.loading-spinner{width:40px;height:40px;border:3px solid var(--border-color);border-top-color:var(--primary-color);border-radius:50%;animation:spin 1s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.loading-text{margin-top:1rem;color:var(--text-muted)}.error-boundary{display:flex;align-items:center;justify-content:center;min-height:400px;padding:2rem}.error-boundary-content{text-align:center;max-width:400px}.error-boundary-content h2{margin-bottom:1rem}.error-boundary-content p{margin-bottom:1.5rem;color:var(--text-muted)}.theme-toggle{background:transparent;border:2px solid var(--border-color);border-radius:50%;width:40px;height:40px;display:flex;align-items:center;justify-content:center;cursor:pointer;color:var(--text-color);transition:all .3s ease}.theme-toggle:hover{background-color:var(--bg-secondary);border-color:var(--primary-color)}@media(max-width:768px){h1{font-size:2rem}h2{font-size:1.5rem}h3{font-size:1.2rem}.container{padding:0 16px}.btn{padding:10px 20px}.btn-large{padding:12px 24px;font-size:1rem}}@media(max-width:480px){html{font-size:15px}h1{font-size:1.75rem}h2{font-size:1.35rem}h3{font-size:1.1rem}.container{padding:0 12px}p{line-height:1.7}.btn{padding:10px 18px;font-size:.95rem}.btn-large{padding:12px 20px;font-size:.95rem;width:100%}input,textarea,select{padding:12px;font-size:16px}.theme-toggle{width:36px;height:36px}}@media(max-width:360px){html{font-size:14px}h1{font-size:1.5rem}h2{font-size:1.25rem}}