:root {
            --bg: #f4f7f5; --card: #ffffff; --text: #1a2e1d;
            --primary: #10b981; --primary-dark: #065f46;
            --secondary: #6366f1; --danger: #f43f5e;
            --glass: rgba(255, 255, 255, 0.7);
            --shadow: 0 10px 30px rgba(0,0,0,0.05);
        }
        [data-theme="dark"] {
            --bg: #0b0f0c; --card: #161b17; --text: #ecfdf5;
            --primary: #34d399; --primary-dark: #059669;
            --glass: rgba(22, 27, 23, 0.8);
            --shadow: 0 10px 30px rgba(0,0,0,0.3);
        }
        body { background: var(--bg); color: var(--text); font-family: 'Inter', sans-serif; margin: 0; transition: 0.4s; display: flex; flex-direction: column; min-height: 100vh; }
        
        #syncStatusBar { position: fixed; top: 0; left: 0; right: 0; height: 3px; background: var(--secondary); z-index: 9999; transform: scaleX(0); transform-origin: left; transition: transform 0.3s ease; }
        #syncLabel { position: fixed; top: 10px; right: 20px; font-size: 10px; font-weight: 800; color: var(--secondary); z-index: 9999; text-transform: uppercase; display: none; }

        #authOverlay { position: fixed; inset: 0; background: var(--bg); z-index: 5000; display: flex; align-items: center; justify-content: center; transition: 0.5s; overflow-y: auto; padding: 20px 0; }
        .auth-card { background: var(--card); padding: 40px; border-radius: 30px; box-shadow: var(--shadow); width: 100%; max-width: 400px; text-align: center; }
        .auth-toggle { margin-top: 20px; font-size: 0.85rem; cursor: pointer; color: var(--primary); font-weight: 600; }
        #authHint { margin-top: 15px; font-size: 0.8rem; color: var(--danger); display: none; background: #fff1f2; padding: 10px; border-radius: 10px; }
        .auth-signup-fields { display: none; }

        nav { position: sticky; top: 0; background: var(--glass); backdrop-filter: blur(12px); display: flex; justify-content: space-between; align-items: center; padding: 1rem 5%; z-index: 1000; border-bottom: 1px solid rgba(0,0,0,0.05); }
        .logo { font-size: 1.5rem; font-weight: 800; color: var(--primary); display: flex; align-items: center; gap: 8px; }
        
        .hero { background: linear-gradient(135deg, var(--primary-dark), var(--primary)); color: white; padding: 3rem 5%; border-radius: 0 0 40px 40px; text-align: left; }
        .stats-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 15px; margin-top: 2rem; }
        .stat-pill { background: rgba(255,255,255,0.15); backdrop-filter: blur(8px); padding: 15px; border-radius: 20px; border: 1px solid rgba(255,255,255,0.2); }
        .stat-label { font-size: 0.75rem; text-transform: uppercase; opacity: 0.8; letter-spacing: 1px; }
        .stat-value { font-size: 1.25rem; font-weight: 700; margin-top: 5px; }

        .container { width: 90%; max-width: 1100px; margin: -40px auto 50px auto; display: grid; grid-template-columns: 1.5fr 1fr; gap: 25px; flex: 1; }
        @media (max-width: 850px) { .container { grid-template-columns: 1fr; } }

        .card { background: var(--card); padding: 25px; border-radius: 24px; box-shadow: var(--shadow); border: 1px solid rgba(0,0,0,0.03); }
        .budget-card { text-align: center; position: relative; }
        .progress-circle { width: 120px; height: 120px; margin: 0 auto 15px; position: relative; display: flex; align-items: center; justify-content: center; border-radius: 50%; background: conic-gradient(var(--primary) 0deg, var(--bg) 0deg); transition: 0.5s; }
        .progress-circle::after { content: ""; position: absolute; width: 100px; height: 100px; background: var(--card); border-radius: 50%; }
        .progress-text { position: relative; z-index: 10; font-weight: 800; font-size: 1.2rem; }
        .goal-info { display: flex; justify-content: space-between; font-size: 0.85rem; margin-top: 15px; border-top: 1px solid rgba(0,0,0,0.05); padding-top: 10px; }
        
        #budgetAlert { display: none; background: #fff1f2; color: #9f1239; border-left: 5px solid var(--danger); padding: 12px; border-radius: 12px; margin-bottom: 20px; font-weight: 600; font-size: 0.85rem; animation: slideIn 0.3s ease-out; }
        @keyframes slideIn { from { transform: translateY(-20px); opacity: 0; } to { transform: translateY(0); opacity: 1; } }

        .form-label { display: block; font-size: 0.8rem; font-weight: 700; margin-bottom: 8px; margin-left: 5px; opacity: 0.8; color: var(--text); text-transform: uppercase; letter-spacing: 0.5px; }
        input, select, textarea { width: 100%; padding: 12px; border-radius: 14px; border: 2px solid transparent; background: var(--bg); color: var(--text); font-size: 1rem; box-sizing: border-box; outline: none; transition: 0.3s; }
        input:focus, textarea:focus { border-color: var(--primary); }
        
        .btn { background: var(--primary); color: white; border: none; padding: 14px 24px; border-radius: 14px; cursor: pointer; font-weight: 700; width: 100%; transition: 0.3s; display: flex; align-items: center; justify-content: center; gap: 8px; }
        .btn:hover { filter: brightness(1.1); transform: translateY(-2px); }
        
        .profile-pic-container { position: relative; width: 110px; height: 110px; margin: 0 auto 15px; }
        .profile-pic { width: 100%; height: 100%; border-radius: 50%; object-fit: cover; border: 4px solid var(--primary); padding: 3px; background: var(--card); }
        .upload-hint { position: absolute; bottom: 5px; right: 5px; background: var(--primary); color: white; border-radius: 50%; width: 32px; height: 32px; display: flex; align-items: center; justify-content: center; font-size: 0.9rem; cursor: pointer; border: 3px solid var(--card); }
        
        .sticker { display: inline-flex; align-items: center; gap: 6px; padding: 8px 16px; border-radius: 50px; font-weight: 800; font-size: 0.75rem; margin-top: 10px; text-transform: uppercase; }
        .sticker-warrior { background: #dcfce7; color: #166534; }
        .sticker-neutral { background: #fef9c3; color: #854d0e; }
        .sticker-student { background: #fee2e2; color: #991b1b; }

        footer { background: var(--card); padding: 50px 5% 20px; margin-top: 50px; border-top: 1px solid rgba(0,0,0,0.05); }
        .footer-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 40px; margin-bottom: 40px; }
        .footer-about h3 { color: var(--primary); margin-top: 0; }
        .footer-links h4 { margin-top: 0; margin-bottom: 15px; font-size: 0.9rem; text-transform: uppercase; letter-spacing: 1px; }
        .footer-links ul { list-style: none; padding: 0; margin: 0; }
        .footer-links li { margin-bottom: 10px; }
        .footer-links a { text-decoration: none; color: var(--text); opacity: 0.7; font-size: 0.85rem; transition: 0.3s; }
        .footer-links a:hover { opacity: 1; color: var(--primary); }
        .footer-socials { display: flex; gap: 15px; margin-top: 15px; }
        .footer-socials a { width: 35px; height: 35px; border-radius: 50%; background: var(--bg); display: flex; align-items: center; justify-content: center; color: var(--text); transition: 0.3s; border: 1px solid rgba(0,0,0,0.05); }
        .footer-socials a:hover { background: var(--primary); color: white; transform: translateY(-3px); }
        .footer-bottom { border-top: 1px solid rgba(0,0,0,0.05); padding-top: 20px; display: flex; flex-wrap: wrap; justify-content: space-between; align-items: center; gap: 15px; }
        .carbon-tag { font-size: 0.7rem; background: #dcfce7; color: #166534; padding: 6px 15px; border-radius: 20px; font-weight: 700; }

        .history-item { display: flex; align-items: center; background: var(--bg); padding: 15px; border-radius: 18px; border-left: 6px solid transparent; margin-bottom: 10px; gap: 10px; }
        .item-green { border-left-color: var(--primary); }
        .item-red { border-left-color: var(--danger); }
        .history-details { flex: 1; text-align: left; }
        .history-date { font-size: 0.7rem; opacity: 0.6; display: block; }
        .edit-btn { color: var(--secondary); cursor: pointer; padding: 5px; font-size: 1.1rem; }

        .pagination-controls { display: flex; justify-content: center; align-items: center; gap: 15px; margin-top: 15px; }
        .page-btn { background: var(--primary); color: white; border: none; padding: 5px 15px; border-radius: 8px; cursor: pointer; font-size: 0.8rem; }
        .page-btn:disabled { background: #ccc; cursor: not-allowed; }
        
        .search-container { position: relative; margin-bottom: 15px; }
        .search-container i { position: absolute; left: 12px; top: 50%; transform: translateY(-50%); opacity: 0.4; }
        .search-container input { padding-left: 35px; font-size: 0.85rem; height: 40px; }

        /* Modal styling remains similar, z-index updated for auth */
        .modal { display: none; position: fixed; inset: 0; background: rgba(0,0,0,0.4); backdrop-filter: blur(10px); z-index: 6000; justify-content: center; align-items: center; }
        .modal-content { background: var(--card); width: 90%; max-width: 400px; padding: 35px; border-radius: 40px; text-align: center; overflow: hidden; }

        optgroup { font-weight: bold; font-style: normal; color: var(--primary-dark); }