/* ==========================================================
   Cấu trúc chung và vị trí toàn bộ trang web
   ========================================================== */
body {
    font-family: 'Roboto', Arial, sans-serif;
    background: #000000;
    margin: 0;
    padding: 0;
}

.container {
    background: #ffffff;
    max-width: none;
    margin: 0;
    padding: 40px 40px 30px 40px;
    box-shadow: 0 4px 24px rgba(0,0,0,0.08);
    position: relative;
    overflow: hidden;
    min-height: 100vh;
    box-sizing: border-box;
}

.container.hidden {
    display: none;
}


/* ==========================================================
   Header và các phần tử liên quan
   ========================================================== */
.header {
    text-align: center;
    position: relative;
    margin-bottom: 20px;
    padding-top: 20px;
    transition: margin-left 0.3s ease;
}

.title {
    font-size: 3rem;
    font-weight: bold;
    color: #4a6cff;
    margin-top: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    margin-bottom: 20px;
}

.subtitle-container {
    height: 2rem;
    overflow: hidden;
    min-height: 1.5rem;
    display: flex;
    justify-content: center;
    align-items: center;
}

.subtitle {
    color: #696c71;
    font-size: 1.5rem;
    opacity: 0;
    transition: opacity 0.3s ease;
}


/* ==========================================================
   Nút Menu và trạng thái đăng nhập
   ========================================================== */
.menu-btn {
    position: absolute;
    left: 5px;
    top: 5px;
    background: #4a6cff;
    color: #fff;
    border-radius: 50%;
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    cursor: pointer;
}

.user-profile {
    display: none;
    font-size: 2.5rem;
    position: absolute;
    top: 50px;
    right: 40px;
    color: #4a6cff;
    font-size: 50px;
    cursor: pointer;
    z-index: 95;
    text-decoration: none;
}

/* Ẩn menu-btn khi side-menu đang mở */
.container.menu-open .menu-btn {
    display: none;
}


/* ==========================================================
   Nội dung chính và các Section
   ========================================================== */
.main {
    width: 90%;
    margin: 0 auto;
    transition: margin-left 0.3s ease, width 0.3s ease;
}

.section {
    margin-bottom: 30px;
}

.section label {
    margin-left: 1%;
    font-size: 1.1rem;
    font-weight: 500;
    margin-bottom: 8px;
    display: block;
    color: #333;
    font-weight: bold;
}


/* ==========================================================
   Khu vực nhập liệu và hiển thị kết quả
   ========================================================== */
.input-area,
.output-area {
    background: #fff;
    border: 2px solid rgb(0, 0, 0);
    border-radius: 24px;
    padding: 18px;
    min-height: 120px;
    position: relative;
    width: 100%;
    height: 200px;
    transition: width 0.3s ease;
}

.input-area textarea {
    width: 100%;
    border: none;
    outline: none;
    font-size: 1.1rem;
    resize: none;
    min-height: 120px;
    background: transparent;
    color: #444;
    font-family: inherit;
}

.output-area {
    min-height: 100px;
    font-size: 1.1rem;
    color: #444;
}


/* ==========================================================
   Các nút chức năng, Tệp và Icon
   ========================================================== */
.file-row {
    display: flex;
    align-items: flex-end;
    flex-wrap: wrap;
}

.file-upload-controls {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 15px;
}

.file-note {
    font-size: 0.9rem;
    color: #888;
    margin-bottom: 5px;
    width: 100%;
}

.file-btn {
    background: #a8ffb0;
    color: #1a4d1a;
    border: none;
    border-radius: 18px;
    padding: 6px 18px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 6px;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.1);
    transition: background 0.2s;
}

.file-btn:hover {
    background: #7be87b;
}

.file-list {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 8px;
    margin-top: 0;
}

.file {
    display: flex;
    align-items: center;
    background: #f5f5f5;
    border-radius: 8px;
    padding: 3px 10px;
    font-size: 0.98rem;
    gap: 4px;
    border: 2px solid #000000;
}

.file .fa-times {
    margin-left: 4px;
    cursor: pointer;
    color: #aaa;
    font-size: 0.95em;
}

.file .fa-file-pdf { color: #e74c3c; }
.file .fa-file-word { color: #3a7bd5; }
.file .fa-file-alt { color: #888; }

.action-btns {
    margin-left: auto;
    display: flex;
    gap: 8px;
}

.send-btn,
.mic-btn {
    background: #4aafff;
    color: #fff;
    border: none;
    border-radius: 50%;
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.1);
    cursor: pointer;
    transition: background 0.2s;
}

.send-btn:hover,
.mic-btn:hover {
    background: #3578e5;
}


/* ==========================================================
   Menu bên, Overlay và Popup đăng nhập
   ========================================================== */
.overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 90;
    visibility: hidden;
    opacity: 0;
    transition: visibility 0s, opacity 0.3s ease;
}

.container.menu-open .overlay {
    visibility: visible;
    opacity: 1;
}

.side-menu {
    position: absolute;
    border-top-right-radius: 24px;
    border-bottom-right-radius: 24px;
    top: 0;
    left: -300px;
    width: 300px;
    height: 100%;
    background-color: #ffffff;
    box-shadow: 4px 0 20px rgba(0, 0, 0, 0.1);
    transition: left 0.3s ease;
    z-index: 100;
    padding: 20px;
    box-sizing: border-box;
    border: 2px solid black;
    display: flex;
    flex-direction: column;
}

.container.menu-open .side-menu {
    left: 0;
}

.close-menu-btn {
    position: absolute;
    top: 15px;
    right: 15px;
    background: none;
    border: none;
    font-size: 28px;
    cursor: pointer;
    color: #888;
}

.close-menu-btn:hover {
    color: #333;
}

.side-menu-header {
    display: flex;
    align-items: center;
    margin-left: 5px;
    margin-top: 5px;
    gap: 15px;
    margin-bottom: 30px;
    font-size: 1.5rem;
    font-weight: bold;
    color: #4a6cff;
    padding-bottom: 15px;
    border-bottom: 2px solid #f0f0f0;
    text-decoration: none;
}

.side-menu-header i {
    font-size: 2.5rem;
}

.menu-list {
    list-style: none;
    padding: 0;
    margin: 0;
    flex-grow: 1;
}

.menu-list li {
    margin-bottom: 10px;
}

.menu-list a {
    display: flex;
    align-items: center;
    gap: 15px;
    padding: 12px;
    text-decoration: none;
    color: #333;
    font-weight: 500;
    border-radius: 8px;
    transition: background-color 0.2s;
}

.menu-list a:hover {
    background-color: #e0e6ff;
    color: #4a6cff;
}

.menu-list a i {
    font-size: 1.2rem;
    width: 25px;
}

.logout-link {
    display: flex;
    align-items: center;
    gap: 15px;
    padding: 12px;
    text-decoration: none;
    color: #333;
    font-weight: 500;
    border-top: 1px solid #f0f0f0;
    margin-top: auto;
    border-radius: 8px;
    transition: background-color 0.2s;
}

.logout-link:hover {
    background-color: #e0e6ff;
    color: #4a6cff;
}

.logout-link i {
    font-size: 1.2rem;
    width: 25px;
}

.container.menu-open .main {
    margin-left: 300px;
    width: calc(100% - 300px - 80px);
}

.container.menu-open .header {
    margin-left: 300px;
}

.login-popup {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    align-items: center;
    justify-content: center;
    background: rgba(0, 0, 0, 0.5);
    z-index: 101;
}

.login-popup.active {
    display: flex;
}

.popup-content {
    background: white;
    border-radius: 12px;
    padding: 30px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
    text-align: center;
    max-width: 500px;
    height: 600px;
    width: 90%;
    border: 2px solid black;
    position: relative;
    box-sizing: border-box;
}

.login-title {
    font-size: 3rem;
    font-weight: bold;
    color: #4a6cff;
    margin-bottom: 10px;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
}

.login-title .icon {
    font-size: 2.2rem;
    color: #4a6cff;
}

.close-login-btn {
    position: absolute;
    top: 5px;
    right: 5px;
    font-size: 30px;
    background: none;
    border: none;
    cursor: pointer;
    color: #999;
}

.login-desc {
    font-size: 2rem;
    color: #666;
    margin-bottom: 25px;
    line-height: 1.4;
}

.google-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto;
    border: 2px solid black;
    width: 100%;
    background-color: #fff;
    color: #000000;
    border-radius: 8px;
    padding: 12px 16px;
    font-size: 1.5rem;
    font-weight: 500;
    cursor: pointer;
    transition: background-color 0.2s, box-shadow 0.2s;
    gap: 10px;
    font-weight: bold;
}

.google-btn:hover {
    background-color: #f8f9fa;
    box-shadow: 0 1px 3px rgba(60,64,67,0.3);
}

.google-btn .fab {
    background: conic-gradient(at 40% 48%,#ea4335 18%, #4285f4 18% 40%, #34a853 40% 65%, #fbbc05 65% 85%, #ea4335 85%);
    background-clip: text;
    -webkit-background-clip: text;
    color: transparent;
    font-size: 3rem;
}


/* ==========================================================
   Footer
   ========================================================== */
.footer {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    font-size: 1rem;
    color: #888;
    padding: 20px;
    box-sizing: border-box;
}

.footer a {
    color: #888;
    text-decoration: underline;
    margin: 0 15px;
}

.footer a:hover {
    text-decoration: underline;
}


/* ==========================================================
   Responsive cho màn hình nhỏ
   ========================================================== */
@media (max-width: 768px) {
    .container {
        margin: 20px;
        padding: 20px;
    }
    .title {
        font-size: 2rem;
    }
    .subtitle {
        font-size: 1.2rem;
    }
    .login {
        font-size: 20px;
        top: 20px;
        right: 20px;
    }
    .menu-btn {
        width: 48px;
        height: 48px;
        font-size: 1.2rem;
    }
    .input-area textarea {
        min-height: 100px;
    }
    .send-btn, .mic-btn {
        width: 40px;
        height: 40px;
        font-size: 1.2rem;
    }
    .side-menu {
        width: 80%;
        left: -80%;
    }
    .container.menu-open .side-menu {
        left: 0;
    }
    .container.menu-open .main,
    .container.menu-open .header {
        margin-left: 0;
        width: 100%;
    }
}