:root{--primary: #0b57d0;--primary-hover: #0842a0;--primary-light: #c2e7ff;--primary-text: #001d35;--bg-app: #f6f8fc;--bg-surface: #ffffff;--text-main: #1f1f1f;--text-muted: #444746;--text-subtle: #727775;--border-color: #e0e2e7;--border-light: #f0f2f5;--sidebar-hover: #e8ebf0;--sidebar-active: #d3e3fd;--danger: #b3261e;--danger-light: #f9dedc;--success: #146c2e}*{box-sizing:border-box;margin:0;padding:0}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif;color:var(--text-main);background-color:var(--bg-app);height:100vh;overflow:hidden;-webkit-font-smoothing:antialiased}#root{height:100vh;display:flex;flex-direction:column}button{font-family:inherit;cursor:pointer;border:none;background:none;outline:none}input,textarea,select{font-family:inherit;outline:none}::-webkit-scrollbar{width:8px;height:8px}::-webkit-scrollbar-track{background:transparent}::-webkit-scrollbar-thumb{background:#c7c7c7;border-radius:4px}::-webkit-scrollbar-thumb:hover{background:#a8a8a8}.app-container{display:flex;flex-direction:column;height:100vh}.app-body{display:flex;flex:1;overflow:hidden}.app-header{height:64px;background-color:var(--bg-app);display:flex;align-items:center;justify-content:space-between;padding:0 20px;border-bottom:1px solid var(--border-color);gap:20px}.brand{display:flex;align-items:center;gap:12px;font-size:1.25rem;font-weight:600;color:var(--primary);min-width:220px}.search-bar{flex:1;max-width:720px;background-color:#eaf1fb;border-radius:28px;display:flex;align-items:center;padding:8px 18px;gap:12px}.search-bar input{flex:1;border:none;background:transparent;font-size:.95rem;color:var(--text-main)}.user-profile{display:flex;align-items:center;gap:12px}.app-sidebar{width:260px;background-color:var(--bg-app);display:flex;flex-direction:column;padding:16px 12px;gap:16px;border-right:1px solid var(--border-color)}.compose-btn{background-color:var(--primary-light);color:var(--primary-text);padding:16px 24px;border-radius:16px;font-size:.95rem;font-weight:600;display:flex;align-items:center;gap:12px;box-shadow:0 1px 3px #0000001a;transition:all .2s ease}.compose-btn:hover{background-color:#b0d7f5;box-shadow:0 2px 6px #00000026}.mailbox-select-container{display:flex;flex-direction:column;gap:6px}.mailbox-select-label{font-size:.75rem;font-weight:600;color:var(--text-subtle);text-transform:uppercase}.mailbox-select{padding:8px 12px;border-radius:8px;border:1px solid var(--border-color);background:#fff;font-size:.85rem}.nav-folders{display:flex;flex-direction:column;gap:2px;flex:1}.folder-item{display:flex;align-items:center;justify-content:space-between;padding:10px 18px;border-radius:20px;color:var(--text-main);font-size:.9rem;font-weight:500;transition:background .15s}.folder-item:hover{background-color:var(--sidebar-hover)}.folder-item.active{background-color:var(--sidebar-active);color:var(--primary-text);font-weight:700}.folder-left{display:flex;align-items:center;gap:14px}.storage-widget{padding:12px;background:#fff;border-radius:12px;border:1px solid var(--border-color);display:flex;flex-direction:column;gap:6px}.storage-header{display:flex;justify-content:space-between;font-size:.75rem;color:var(--text-subtle)}.progress-bar-bg{height:6px;background-color:var(--border-light);border-radius:3px;overflow:hidden}.progress-bar-fill{height:100%;background-color:var(--primary);border-radius:3px}.content-area{flex:1;background-color:var(--bg-surface);margin:0 16px 16px 0;border-radius:16px;border:1px solid var(--border-color);display:flex;flex-direction:column;overflow:hidden}.message-list-toolbar{height:48px;border-bottom:1px solid var(--border-color);display:flex;align-items:center;justify-content:space-between;padding:0 16px}.messages-scroll{flex:1;overflow-y:auto}.message-row{display:flex;align-items:center;padding:12px 16px;border-bottom:1px solid var(--border-light);gap:16px;cursor:pointer;transition:background .1s}.message-row:hover{background-color:#f7f9fc}.message-row.unread{background-color:#fff;font-weight:700}.message-row.unread .message-subject{color:#000}.message-from{width:180px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;font-size:.9rem}.message-snippet-group{flex:1;display:flex;align-items:center;gap:8px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;font-size:.9rem}.message-subject{color:var(--text-main)}.message-snippet{color:var(--text-subtle);font-weight:400}.message-date{font-size:.8rem;color:var(--text-subtle);width:80px;text-align:right}.message-view-container{display:flex;flex-direction:column;height:100%;overflow-y:auto;padding:24px 32px;gap:20px}.message-view-header{display:flex;justify-content:space-between;align-items:flex-start;border-bottom:1px solid var(--border-color);padding-bottom:16px}.message-view-subject{font-size:1.4rem;font-weight:600;color:var(--text-main)}.message-view-body-frame{width:100%;min-height:400px;border:none;background:#fff;border-radius:8px}.compose-window{position:fixed;bottom:0;right:40px;width:600px;height:520px;background:#fff;border-radius:12px 12px 0 0;box-shadow:0 8px 24px #00000040;display:flex;flex-direction:column;z-index:100;border:1px solid var(--border-color);border-bottom:none}.compose-header{background-color:#f2f6fc;padding:10px 16px;border-radius:12px 12px 0 0;display:flex;justify-content:space-between;align-items:center;font-weight:600;font-size:.9rem}.compose-body{padding:12px 16px;display:flex;flex-direction:column;gap:10px;flex:1}.compose-input-row{display:flex;align-items:center;border-bottom:1px solid var(--border-light);padding-bottom:6px}.compose-input-row input{flex:1;border:none;font-size:.9rem}.compose-textarea{flex:1;border:none;resize:none;font-size:.95rem}.compose-footer{padding:12px 16px;background:#f8fafc;display:flex;justify-content:space-between;align-items:center;border-top:1px solid var(--border-light)}.send-action-btn{background-color:var(--primary);color:#fff;padding:10px 24px;border-radius:20px;font-weight:600;font-size:.9rem;transition:background .15s}.send-action-btn:hover{background-color:var(--primary-hover)}.login-screen{position:fixed;top:0;right:0;bottom:0;left:0;background-color:#eef2f8;display:flex;align-items:center;justify-content:center;z-index:1000}.login-card{width:420px;background:#fff;padding:40px;border-radius:24px;box-shadow:0 10px 30px #00000014;display:flex;flex-direction:column;gap:24px}.login-title{text-align:center;color:var(--primary);font-size:1.6rem;font-weight:700}.login-form{display:flex;flex-direction:column;gap:16px}.form-group{display:flex;flex-direction:column;gap:6px}.form-group label{font-size:.85rem;font-weight:600;color:var(--text-muted)}.form-group input{padding:12px 16px;border-radius:12px;border:1px solid var(--border-color);font-size:.95rem}.form-group input:focus{border-color:var(--primary)}.login-submit-btn{background-color:var(--primary);color:#fff;padding:14px;border-radius:12px;font-weight:600;font-size:1rem;margin-top:8px}.login-submit-btn:hover{background-color:var(--primary-hover)}