:root{--bg-light: #f0f8ff;--bg-dark: #1a1a2e;--card-light: #ffffff;--card-dark: #2a2a3d;--primary-light: #003366;--primary-dark: #3399ff;--text-light: #000;--text-dark: #fff;--muted-light: #555;--muted-dark: #bbb;--hover-light: #cce0ff;--hover-dark: #3a3a50}[data-theme=light]{--bg: var(--bg-light);--card-bg: var(--card-light);--primary: var(--primary-light);--text: var(--text-light);--muted: var(--muted-light);--hover: var(--hover-light)}[data-theme=dark]{--bg: var(--bg-dark);--card-bg: var(--card-dark);--primary: var(--primary-dark);--text: var(--text-dark);--muted: var(--muted-dark);--hover: var(--hover-dark)}html,body{height:100%;margin:0;padding:0;background-color:var(--bg);display:block;justify-content:center;align-items:center;align-content:center}.app-container{margin:0;padding:0;background:var(--bg);color:var(--text);font-family:Segoe UI,sans-serif;height:100%;overflow:hidden}.header input.search-bar{padding:6px 10px;border-radius:6px;border:1px solid #ccc;outline:none;width:200px}.add-top-btn{padding:6px 12px;background:var(--primary);color:#fff;border:none;border-radius:6px;cursor:pointer}.add-top-btn:hover{opacity:.85}.layout{display:flex;gap:12px;height:calc(100vh - 80px);padding:0 15px}.left-column{flex:1;overflow-y:auto;padding-right:15px}.right-panel{flex:1;border-left:1px solid var(--muted);padding-left:10px;overflow-y:auto}.contact-card{background:var(--card-bg);transition:background .2s}.contact-card:hover{background:var(--hover)}.alphabet-header{font-weight:700;font-size:14px;margin:6px 0;color:var(--primary)}.floating-buttons{position:fixed;bottom:20px;right:20px;display:flex;flex-direction:column;gap:10px}.float-add,.float-theme{width:44px;height:44px;border-radius:50%;border:none;background:var(--primary);color:#fff;display:flex;align-items:center;justify-content:center;cursor:pointer}.float-add:hover,.float-theme:hover{opacity:.85}.modal-backdrop{position:fixed;inset:0;background:#00000080;display:flex;align-items:flex-start;justify-content:center;z-index:100;overflow-y:auto}.modal-slide{background:var(--card-bg);margin-top:50px;padding:20px;border-radius:12px;min-width:320px;max-width:500px;width:90%;animation:slideDown .3s ease}@keyframes slideDown{0%{transform:translateY(-50px);opacity:0}to{transform:translateY(0);opacity:1}}.modal-buttons{display:flex;justify-content:flex-end;gap:12px;margin-top:20px}.success-popup.top{position:fixed;top:10px;left:50%;transform:translate(-50%);background:var(--primary);color:#fff;padding:10px 20px;border-radius:8px;z-index:200;animation:fadeIn .3s}@keyframes fadeIn{0%{opacity:0;transform:translateY(-20px)}to{opacity:1;transform:translateY(0)}}.message-panel input{outline:none}.message-panel button{border:none;background:var(--primary);color:#fff;padding:6px 10px;border-radius:6px;cursor:pointer}.message-panel button:hover{opacity:.85}.left-column::-webkit-scrollbar,.right-panel::-webkit-scrollbar,.msg-body::-webkit-scrollbar{width:6px}.left-column::-webkit-scrollbar-thumb,.right-panel::-webkit-scrollbar-thumb,.msg-body::-webkit-scrollbar-thumb{background-color:var(--primary);border-radius:3px}.modal-backdrop{position:fixed;top:0;left:0;width:100%;height:100%;background:#00000073;display:flex;justify-content:center;align-items:flex-start;z-index:1000;overflow:hidden}.modal-slide.add-modal{position:relative;margin-top:40px;width:420px;background:var(--bg);border-radius:16px;box-shadow:0 10px 30px #00000040;animation:slideDown .35s ease forwards;padding:25px 30px}@keyframes slideDown{0%{transform:translateY(-120%);opacity:0}to{transform:translateY(0);opacity:1}}.modal-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:16px}.icon-btn.close-btn{background:none;border:none;color:var(--text);cursor:pointer}.add-form{display:flex;flex-direction:column;gap:12px}.add-form input{padding:10px 12px;border-radius:8px;border:1px solid var(--border);background:var(--input-bg);color:var(--text)}.form-buttons{display:flex;justify-content:flex-end;gap:10px;margin-top:12px}.cancel-btn,.save-btn{display:flex;align-items:center;gap:6px;padding:8px 14px;border-radius:8px;font-weight:600;border:none;cursor:pointer}.cancel-btn{background:#e74c3c;color:#fff}.save-btn{background:#3498db;color:#fff}.profile-preview{display:flex;justify-content:center;margin-bottom:15px}.profile-preview img{width:90px;height:90px;border-radius:50%;object-fit:cover;border:3px solid var(--primary)}.default-avatar{width:90px;height:90px;border-radius:50%;display:flex;align-items:center;justify-content:center;border:3px dashed var(--primary);background:var(--input-bg)}.contact-photo.default{width:50px;height:50px;border-radius:50%;background:var(--input-bg);display:flex;align-items:center;justify-content:center;border:2px dashed var(--primary)}.contact-card.hovered{background:var(--primary-light);color:var(--text-on-primary)}.contact-card.hovered .icon-btn svg{color:var(--text-on-primary)}