/* Kế thừa hệ thống thiết kế từ trang web chính của bạn */
:root {
    /* Colors */
    --color-true-white: #ffffff;
    --color-gray-0: #FAFAFA;
    --color-gray-50: #F5F5F5;
    --color-gray-200: #E0E0E0;
    --color-gray-600: #6F6F6F;
    --color-gray-800: #4A4A4A;
    --color-gray-900: #2A2A2A;
    --color-yellow-500: #F7D85F;
    --color-brown-700: #8B4513;
    --color-red-500: #dc3545;
    --color-red-700: #d62d20;
    --color-green-100: #d4edda;
    --color-green-700: #155724;
    --color-blue-700: #007bff;
    --color-blue-800: #0056b3;

    /* Text Colors */
    --text-color-default: var(--color-gray-800);
    --text-color-secondary: var(--color-gray-600);
    --text-color-accent: var(--color-yellow-500);
    --text-color-on-dark: var(--color-gray-0);
    --text-color-danger: var(--color-red-700);
    --text-color-light: var(--color-gray-0);
    --text-color-link: var(--color-blue-700);

    /* Background Colors */
    --bg-color-body: var(--color-gray-50);
    --bg-color-surface: var(--color-true-white);
    --bg-color-dark: var(--color-gray-900);
    --bg-color-accent: var(--color-yellow-500);
    --bg-color-primary: var(--color-gray-900);
    --bg-color-primary-hover: var(--color-yellow-500);
    --bg-color-success: var(--color-green-100);

    /* Border Colors */
    --border-color-default: var(--color-gray-200);
    --border-color-strong: var(--color-gray-600);
    --border-color-accent: var(--color-brown-700);
    
    /* Sizing & Spacing */
    --gap-s: 8px;
    --gap-m: 10px;
    --gap-l: 15px;
    --gap-xl: 20px;
    --gap-xxl: 25px;
    --radius-md: 5px;
    
    /* Font */
    --font-primary: Inter, sans-serif;
    --font-size-base: 16px;
    --font-weight-light: 300;
    --font-weight-normal: 400;
    --font-weight-bold: 700;
    --line-height-normal: 1.5;
    
    /* Shadow */
    --box-shadow-default: 0 3px 6px rgba(0,0,0,0.05);
}

/* --- Global Styles --- */
body {
    margin: 0;
    padding: 0;
    background-color: var(--bg-color-body);
    color: var(--text-color-default);
    font-family: var(--font-primary);
    font-size: var(--font-size-base);
    line-height: var(--line-height-normal);
    font-weight: var(--font-weight-light);
}

* {
    box-sizing: border-box;
}

/* --- Layout --- */
.wrapper {
    max-width: 1280px;
    margin: 0 auto;
    padding: var(--gap-xxl);
}

.main-box {
    background-color: var(--bg-color-surface);
    padding: var(--gap-xl);
    border: 1px solid var(--border-color-default);
    border-radius: var(--radius-md);
    box-shadow: var(--box-shadow-default);
}

.main-box h1, .main-box h2 {
    margin: 0 0 var(--gap-xl) 0;
    font-weight: var(--font-weight-light);
    color: var(--color-gray-900);
}

.page-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--gap-xl);
    flex-wrap: wrap;
    gap: var(--gap-l);
}

/* --- Components --- */
.login-container { 
  max-width: 420px;
  margin: 5vh auto;
  background-color: var(--bg-color-surface);
  border: 1px solid var(--border-color-default);
  box-shadow: var(--box-shadow-default);
  border-radius: var(--radius-md);
  padding: 40px;
}
.login-container h2, .login-container p {
  text-align: center;
}
.login-wrapper .error {
    text-align: center;
    color: var(--text-color-danger);
    margin-top: var(--gap-l);
}
/* Links & Buttons */
a {
    color: var(--text-color-default);
    text-decoration: none;
    transition: color 0.2s ease;
}
a:hover {
    color: var(--color-brown-700);
    text-decoration: underline;
}

.btn {
    display: inline-block;
    padding: var(--gap-m) var(--gap-l);
    border: none;
    border-radius: var(--radius-md);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-normal);
    text-align: center;
    cursor: pointer;
    text-decoration: none !important;
    transition: background-color 0.2s ease, color 0.2s ease;
}

.btn-primary {
    background-color: var(--bg-color-primary);
    color: var(--text-color-light);
}
.btn-primary:hover {
    background-color: var(--bg-color-primary-hover);
    color: var(--text-color-default);
}
.btn:disabled {
    background-color: var(--color-gray-200);
    cursor: not-allowed;
    opacity: 0.7;
}

/* Tables */
.table-styled {
    width: 100%;
    border-collapse: collapse;
    margin-top: var(--gap-xl);
}
.table-styled th,
.table-styled td {
    padding: var(--gap-l);
    border: 1px solid var(--border-color-default);
    text-align: center;
    vertical-align: middle;
}
.table-styled thead th {
    background-color: #4A4A4A;
    color: #FAFAFA;
    font-weight: var(--font-weight-normal);
    text-transform: uppercase;
    font-size: 14px;
    letter-spacing: 0.5px;
}

/* Status Indicators */
.status-badge {
    padding: 3px var(--gap-s);
    border-radius: var(--radius-md);
    font-size: 12px;
    font-weight: var(--font-weight-bold);
    text-transform: uppercase;
    border: 1px solid transparent;
}
.status-online {
    background-color: var(--bg-color-success);
    color: var(--color-green-700);
    border-color: var(--color-green-700);
}
.status-offline {
    background-color: var(--color-gray-200);
    color: var(--color-gray-800);
    border-color: var(--color-gray-600);
}

/* Forms */
.form-group {
    margin-bottom: var(--gap-l);
}
.form-group label {
    display: block;
    margin-bottom: var(--gap-s);
    font-weight: var(--font-weight-normal);
}
.form-control {
    width: 100%;
    max-width: 400px;
    padding: var(--gap-m);
    border: 1px solid var(--border-color-default);
    border-radius: var(--radius-md);
    font-size: var(--font-size-base);
}
.form-control:disabled {
    background-color: var(--color-gray-50);
}

/* Misc */
.error-message {
    color: var(--text-color-danger);
    border: 1px solid var(--text-color-danger);
    background-color: #f8d7da;
    padding: var(--gap-l);
    margin-bottom: var(--gap-xl);
    border-radius: var(--radius-md);
}
.success-message {
    color: var(--color-green-700);
    background-color: var(--color-green-100);
    border: 1px solid var(--color-green-700);
    padding: var(--gap-l);
    margin-bottom: var(--gap-xl);
    border-radius: var(--radius-md);
}

/* Header & Footer */
.main-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--gap-l);
  margin-bottom: var(--gap-xl);
  border: 1px solid var(--border-color-default);
  flex-wrap: wrap;
  background-color: var(--bg-color-surface);
  border-radius: 5px;
}
.logo-container img { display: block; }
.header-right { text-align: right; }
.header-title {
    margin: 0 0 var(--gap-s) 0;
    font-size: 24px;
    font-weight: var(--font-weight-light);
    color: var(--color-gray-900);
}
.user-info {
    font-size: 14px;
    color: var(--text-color-secondary);
}
.user-info a {
    color: var(--color-red-700);
	font-weight: 400;
}
.user-info a:hover { text-decoration: underline; }
.main-footer {
  margin-top: var(--gap-xxl);
  padding: var(--gap-l);
  border: 1px solid var(--border-color-default);
  font-size: 14px;
  color: var(--text-color-default);
  background-color: var(--bg-color-surface);
  border-radius: 5px;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--gap-m);
}

/* Filter & Pagination */
.filter-form {
    background-color: var(--color-gray-0);
    padding: var(--gap-l);
    border: 1px solid var(--border-color-default);
    border-radius: var(--radius-md);
    margin-bottom: var(--gap-xl);
}
.filter-form .form-row {
    display: flex;
    align-items: flex-end;
    gap: var(--gap-l);
    flex-wrap: wrap;
}
.filter-form .form-group { margin-bottom: 0; }
.filter-form .form-control { max-width: 250px; }
.filter-form label { font-size: 14px; }
.pagination-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: var(--gap-xl);
    flex-wrap: wrap;
    gap: var(--gap-l);
}
.pagination-summary {
    font-size: 14px;
    color: var(--text-color-secondary);
}
.pagination ul {
    margin: 0;
    padding: 0;
    list-style: none;
    display: flex;
    gap: var(--gap-s);
    flex-wrap: wrap;
    justify-content: center;
}
.pagination li a, .pagination li span {
    display: block;
    padding: 8px 12px;
    border: 1px solid var(--border-color-default);
    border-radius: var(--radius-md);
    background-color: var(--bg-color-surface);
    color: var(--text-color-link);
    text-decoration: none;
}
.pagination li a:hover {
    background-color: var(--color-gray-50);
    text-decoration: none;
}
.pagination li.active span {
    background-color: var(--bg-color-primary);
    color: var(--text-color-on-dark);
    border-color: var(--bg-color-primary);
}
.pagination li.disabled span {
    color: var(--text-color-secondary);
    background-color: var(--color-gray-0);
    cursor: not-allowed;
}

/* Giao diện thẻ lồng nhau (IP Node) */
.ip-node {
    border: 1px solid var(--border-color-default);
    border-radius: var(--radius-md);
    margin-bottom: var(--gap-l);
    background-color: var(--bg-color-surface);
    box-shadow: var(--box-shadow-default);
    transition: box-shadow 0.2s ease;
}
.ip-node:hover {
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}
.ip-node .content {
    display: grid;
    grid-template-columns: 2.5fr 1.5fr 1.5fr 2fr;
    gap: var(--gap-l);
    align-items: center;
    padding: var(--gap-l);
}
.ip-node .children {
    padding: var(--gap-l);
    padding-top: 0;
    margin-left: 40px;
    border-left: 2px dashed var(--border-color-default);
}
.info-group {
    display: flex;
    flex-direction: column;
    gap: 5px;
}
.info-group strong { font-weight: var(--font-weight-bold); }
.cidr-link { font-weight: var(--font-weight-bold); font-size: 18px; }
.actions {
    display: flex;
    gap: var(--gap-s);
    justify-content: flex-end;
    flex-wrap: wrap;
}
.actions a {
    padding: 5px 10px;
    border-radius: var(--radius-md);
    background-color: var(--color-gray-50);
    border: 1px solid var(--border-color-default);
    font-size: 12px;
    text-transform: uppercase;
    font-weight: var(--font-weight-bold);
    white-space: nowrap;
}
.actions a:hover {
    background-color: var(--color-gray-200);
    text-decoration: none;
    border-color: var(--color-gray-600);
}
.actions a.delete-link {
    color: var(--text-color-danger);
    border-color: var(--text-color-danger);
}
 .actions a.delete-link:hover {
    background-color: var(--color-red-500);
    color: var(--color-true-white);
}
.toggle {
    cursor: pointer;
    user-select: none;
    padding-right: var(--gap-m);
    font-family: monospace;
    font-size: 18px;
    color: var(--text-color-secondary);
}

/* ============================================================ */
/* --- PHẦN MỚI: TỐI ƯU RESPONSIVE ---                         */
/* ============================================================ */

/* --- Dành cho Tablet (<= 1024px) --- */
@media screen and (max-width: 1024px) {
    .wrapper {
        padding: var(--gap-l);
    }
    
    /* Chuyển layout thẻ IP sang 2 cột cho gọn hơn */
    .ip-node .content {
        grid-template-columns: 1fr 1fr;
    }
}


/* --- Dành cho Điện thoại (<= 768px) --- */
@media screen and (max-width: 768px) {
    .main-header,
    .page-header,
    .main-footer {
        flex-direction: column;
        gap: var(--gap-l);
        text-align: center;
    }
    .header-right { text-align: center; }
    .main-footer { justify-content: center; }

    /* Xếp chồng các thẻ IP thành 1 cột */
    .ip-node .content {
        grid-template-columns: 1fr;
        gap: var(--gap-l);
        text-align: left;
        padding: var(--gap-m);
    }
    .ip-node .children {
        margin-left: 20px;
        padding-left: var(--gap-l);
    }
    .actions {
        justify-content: flex-start; /* Căn trái các nút action */
    }
    .info-group, .actions {
        border-bottom: 1px solid var(--border-color-default);
        padding-bottom: var(--gap-l);
    }
    .ip-node .content > *:last-child {
        border-bottom: none;
        padding-bottom: 0;
    }
    
    /* Xếp chồng form lọc */
    .filter-form .form-row {
        flex-direction: column;
        align-items: stretch;
    }
    .filter-form .form-control {
        max-width: 100%;
    }
    
    /* Responsive cho bảng gốc (dành cho trang chi tiết IP) */
    .table-styled thead {
        border: none;
        clip: rect(0 0 0 0);
        height: 1px;
        margin: -1px;
        overflow: hidden;
        padding: 0;
        position: absolute;
        width: 1px;
    }
    .table-styled tr {
        display: block;
        margin-bottom: var(--gap-l);
        border: 1px solid var(--border-color-default);
        border-radius: var(--radius-md);
        box-shadow: var(--box-shadow-default);
    }
    .table-styled td {
        display: block;
        text-align: right;
        border-bottom: 1px solid var(--border-color-default);
        padding-left: 50%;
        position: relative;
    }
    .table-styled td:last-child {
        border-bottom: 0;
    }
    .table-styled td::before {
        content: attr(data-label);
        position: absolute;
        left: var(--gap-l);
        width: calc(50% - var(--gap-l) * 2);
        font-weight: var(--font-weight-bold);
        text-align: left;
        white-space: nowrap;
    }
}