:root{--background-color: #121212;--surface-color: #1e1e1e;--primary-color: #bb86fc;--primary-variant-color: #3700b3;--secondary-color: #03dac6;--on-background-color: #e0e0e0;--on-surface-color: #ffffff;--border-color: #333333;--error-color: #cf6679}*{box-sizing:border-box;margin:0;padding:0}html,body{font-family:Poppins,sans-serif;background-color:var(--background-color);color:var(--on-background-color);line-height:1.6}#root{display:flex;flex-direction:column;min-height:100vh;padding:2rem}.app-header{text-align:center;margin-bottom:2rem;padding-bottom:1rem;border-bottom:1px solid var(--border-color)}.app-header h1{font-size:2.5rem;font-weight:600;color:var(--on-surface-color);letter-spacing:1px;display:flex;align-items:center;justify-content:center;gap:.75rem}.main-container{display:flex;gap:2rem;flex:1}.input-column,.output-column{flex:1;background-color:var(--surface-color);border-radius:12px;padding:2rem;border:1px solid var(--border-color);box-shadow:0 4px 12px #0003;display:flex;flex-direction:column}.form-group{margin-bottom:1.5rem}.form-group label{display:block;font-size:1rem;font-weight:500;margin-bottom:.5rem;color:var(--on-background-color)}.form-control{width:100%;padding:.75rem 1rem;background-color:var(--background-color);border:1px solid var(--border-color);border-radius:8px;color:var(--on-surface-color);font-size:1rem;font-family:Poppins,sans-serif;transition:border-color .2s,box-shadow .2s}.form-control:focus{outline:none;border-color:var(--primary-color);box-shadow:0 0 0 3px #bb86fc40}textarea.form-control{resize:vertical;min-height:150px}.submit-btn{width:100%;padding:.8rem 1rem;background:linear-gradient(90deg,var(--primary-variant-color),var(--primary-color));color:var(--on-surface-color);border:none;border-radius:8px;font-size:1.1rem;font-weight:600;cursor:pointer;transition:transform .2s,box-shadow .2s;display:flex;align-items:center;justify-content:center;gap:.5rem;margin-top:1rem}.submit-btn:hover:not(:disabled){transform:translateY(-2px);box-shadow:0 6px 15px #bb86fc4d}.submit-btn:disabled{opacity:.5;cursor:not-allowed}.output-placeholder,.error-message{display:flex;align-items:center;justify-content:center;text-align:center;height:100%;color:var(--on-background-color);opacity:.7;font-size:1.2rem}.error-message{color:var(--error-color);white-space:pre-wrap}.loader-container{display:flex;align-items:center;justify-content:center;height:100%}.spinner{border:4px solid rgba(255,255,255,.2);border-left-color:var(--secondary-color);border-radius:50%;width:50px;height:50px;animation:spin 1s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.result-card{background-color:var(--background-color);border:1px solid var(--border-color);border-radius:8px;margin-bottom:1.5rem;padding:1rem 1.5rem}.card-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:.75rem;gap:1rem}.card-header h3{color:var(--secondary-color);font-weight:600;white-space:nowrap}.char-counter{margin:0 auto;font-size:.85rem;font-weight:500;background-color:var(--surface-color);padding:.2rem .6rem;border-radius:4px;border:1px solid var(--border-color);transition:all .2s ease-in-out}.char-counter.limit-exceeded{color:var(--on-surface-color);background-color:var(--error-color);font-weight:600;border-color:var(--error-color)}.copy-btn{background:none;border:1px solid var(--border-color);color:var(--on-background-color);cursor:pointer;padding:.25rem .5rem;border-radius:6px;display:flex;align-items:center;gap:.3rem;font-size:.8rem;transition:background-color .2s;flex-shrink:0}.copy-btn:hover{background-color:var(--border-color)}.copy-btn svg{width:14px;height:14px}.card-content ul{list-style-type:none;padding-left:0}.card-content li{background-color:var(--surface-color);padding:.5rem .75rem;border-radius:4px;margin-bottom:.5rem;font-size:.95rem}.copyable-li{display:flex;justify-content:space-between;align-items:center;gap:1rem}.card-content strong{color:var(--primary-color)}.hashtag-list{display:flex;flex-wrap:wrap;gap:.5rem}.hashtag-list li{background-color:var(--primary-variant-color);color:var(--secondary-color);font-weight:500}.optimizer-tag{color:var(--secondary-color);border:1px dashed var(--secondary-color);font-weight:600}.sources-card{border-color:var(--secondary-color)}.sources-card .card-header h3{color:var(--on-surface-color)}.sources-list li{background-color:transparent;padding:.2rem 0}.sources-list a{color:var(--secondary-color);text-decoration:none;display:inline-flex;align-items:center;gap:.5rem;font-size:.9rem;transition:color .2s}.sources-list a:hover{color:var(--on-surface-color);text-decoration:underline}.sources-list svg{width:16px;height:16px;opacity:.7;flex-shrink:0}@media (max-width: 900px){.main-container{flex-direction:column}#root{padding:1rem}.app-header h1{font-size:1.8rem}}