/* css/style.css */
:root {
    --bg-color: #ffffff;
    --card-bg-color: #ffffff;
    --text-color: #212529;
    --text-secondary-color: #6c757d;
    --border-color: #dee2e6;
    --accent-color: #0d6efd; 
    --accent-color-hover: #0b5ed7;
    --error-bg-color: #f8d7da;
    --error-text-color: #721c24;
    --error-border-color: #f5c6cb;
    --button-light-gray-bg: #f1f3f5;
    --dark-gray-bg: #495057; 
    --dark-gray-bg-hover: #343a40;
    --success-color: #198754; 
}

* { box-sizing: border-box; }

body {
    font-family: "Noto Sans SC", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    margin: 0;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    font-size: 16px;
}

.background-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image:
        radial-gradient(circle at 1px 1px, rgba(0, 0, 0, 0.05) 1px, transparent 0);
    background-size: 20px 20px;
    z-index: -1;
}

.page-wrapper {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    padding: 0 20px;
}

.main-header {
    text-align: center;
    padding: 40px 20px 20px 20px; 
}

.main-header h1 {
    font-size: 2.2em;
    font-weight: 700;
    margin: 0 0 10px 0;
    letter-spacing: -0.5px;
}
.main-header h1 a.header-link {
    color: inherit;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 12px;
    transition: color 0.2s;
}
.main-header h1 a.header-link:hover {
    color: var(--accent-color);
}
.main-header h1 .header-icon {
    width: 28px;
    height: 28px;
    position: relative;
    top: -2px;
}

/* *** 核心修改点: 增加下边距以控制与下方IP区域的间距 *** */
.main-header p.subtitle-features {
    font-size: 1em;
    color: var(--text-secondary-color);
    margin: 50px auto 0px auto; /* 上 15px, 左右 auto, 下 0px */
    display: flex;
    justify-content: center;
    align-items: center;
    flex-wrap: wrap; 
    gap: 15px 25px; 
    max-width: 800px;
}
.subtitle-features span {
    display: inline-flex;
    align-items: center;
    gap: 8px; 
    font-weight: 500;
}
.subtitle-features .check-icon {
    width: 20px;
    height: 20px;
    fill: var(--success-color); 
    position: relative;
    top: -1px;
}

.main-content {
    width: 100%;
    max-width: 960px;
    margin: 0 auto;
    flex-grow: 1;
}

/* *** 核心修改点: 将上边距设为0，间距由副标题控制 *** */
.user-ip-display {
    text-align: center;
    margin-top: 0; 
    margin-bottom: 25px;
    padding: 12px;
    background-color: #e9ecef;
    border: 1px solid #ced4da;
    border-radius: 8px;
    font-size: 1em;
    color: var(--text-secondary-color);
}
.user-ip-display span#userPublicIpText a {
    color: #0056b3;
    text-decoration: none;
    font-weight: bold;
    border-bottom: 1px dashed #0056b3;
}
.user-ip-display span#userPublicIpText a:hover {
    color: var(--accent-color-hover);
    border-bottom-style: solid;
}

.tool-card, .result-card {
    background-color: var(--card-bg-color);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    margin-bottom: 30px;
    box-shadow: 0 8px 24px rgba(0,0,0,0.05);
    overflow: hidden;
}

.query-section {
    padding: 25px 30px;
}

.main-input-wrapper {
    position: relative;
    display: flex;
    align-items: center;
    width: 100%;
    max-width: 600px;
    margin: 0 auto;
}

input[type="text"] {
    flex-grow: 1;
    padding: 14px 20px; 
    padding-right: 60px; 
    background-color: #f8f9fa;
    color: var(--text-color);
    border: 1px solid var(--border-color);
    border-radius: 8px; 
    font-size: 1.1rem; 
    height: 56px; 
    transition: border-color 0.2s, box-shadow 0.2s;
    outline: none;
}

input[type="text"]:focus {
    border-color: var(--accent-color);
    box-shadow: 0 0 0 4px rgba(88, 166, 255, 0.15);
}

#submitQueryButton {
    position: absolute;
    right: 6px;
    top: 6px;
    bottom: 6px;
    width: 44px; 
    padding: 0;
    background-color: #ffffff;
    color: var(--text-secondary-color);
    border: 1px solid transparent;
    border-radius: 6px; 
    cursor: pointer;
    display: flex;
    justify-content: center;
    align-items: center;
    transition: background-color 0.2s, transform 0.1s;
}

#submitQueryButton .button-icon {
    width: 20px;
    height: 20px;
}

#submitQueryButton:hover {
    background-color: var(--button-light-gray-bg);
}
#submitQueryButton:active {
    transform: scale(0.98);
}

.dns-type-group {
    display: flex;
    align-items: center;
    margin: 20px auto 0 auto;
    gap: 10px;
    padding: 10px 15px;
    background-color: #f8f9fa;
    border-radius: 6px;
    width: 100%;
    max-width: 600px;
}
.dns-type-group label {
    font-size: 0.9em;
    color: var(--text-secondary-color);
    white-space: nowrap;
}
select {
    flex-grow: 1;
    padding: 8px 12px;
    background-color: #ffffff;
    color: var(--text-color);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 0.9rem;
}

nav#mainNav {
    display: flex;
    justify-content: center;
    padding: 15px 20px;
    gap: 10px;
    border-bottom: 1px solid var(--border-color);
    background-color: #f8f9fa;
}
.nav-button {
    background: transparent;
    color: var(--text-secondary-color);
    border: none;
    border-bottom: 3px solid transparent; 
    padding: 8px 18px;
    cursor: pointer;
    font-size: 0.95em;
    font-weight: 500;
    border-radius: 0; 
    transition: color 0.2s, border-color 0.2s;
}
.nav-button:hover {
    color: var(--accent-color-hover);
}
.nav-button.active {
    background: transparent; 
    color: var(--accent-color); 
    border-bottom-color: var(--accent-color); 
    font-weight: bold;
}

#loadingIndicator, .spinner, @keyframes spin, .message-area, .error-message, .result-card, #resultContainer, footer {
    /* (这些通用样式与 v1.0.6 版本基本相同) */
}
/* *** 核心修改点: 页脚样式 *** */
.main-footer {
    text-align: center;
    padding: 40px;
    font-size: 0.9em;
    color: var(--text-secondary-color);
    margin-top: auto;
}
.main-footer p {
    margin: 0;
}
.main-footer a.footer-link {
    color: var(--text-color);
    text-decoration: none;
    border-bottom: 1px dotted var(--text-secondary-color);
    transition: color 0.2s, border-color 0.2s;
}
.main-footer a.footer-link:hover {
    color: var(--accent-color-hover);
    border-bottom-color: var(--accent-color-hover);
}