:root {
    --primary-color: #007aff;
    --primary-hover: #005ecb;
    --text-primary: #1d1d1f;
    --text-secondary: #6e6e73;
    --border-color: #d2d2d7;
    --bg-light: #f5f5f7;
    --bg-gradient: linear-gradient(180deg, #fdfdfd 0%, #f5f5f7 100%);
    --white: #ffffff;
    --shadow: 0 8px 24px rgba(0, 0, 0, 0.1);
    --shadow-sm: 0 2px 6px rgba(0, 0, 0, 0.06);
}

* {
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--bg-light);
    background-image: radial-gradient(circle at top left, rgba(0, 122, 255, 0.03), transparent 30%),
                      radial-gradient(circle at bottom right, rgba(0, 122, 255, 0.03), transparent 30%);
    color: var(--text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.container {
    max-width: 960px;
}

.page-title {
    font-size: 3.2rem;
    font-weight: 700;
    margin-bottom: 2rem;
    letter-spacing: -1px;
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
}

.page-title span {
    background: linear-gradient(45deg, var(--primary-color), #0056b3);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    text-shadow: 2px 2px 8px rgba(0, 0, 0, 0.05);
}

/* 当前IP信息 */
.current-ip-section {
    background: var(--white);
    border-radius: 16px;
    padding: 2.5rem;
    margin-bottom: 2.5rem;
    box-shadow: var(--shadow-sm);
    cursor: pointer;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    border: 1px solid transparent;
    text-align: center;
}

.current-ip-section:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow);
}

.current-ip-section .ip-address {
    font-size: 2.2rem;
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
}

.current-ip-section .ip-address .bi-clipboard {
    font-size: 1.4rem;
    margin-left: 1rem;
    color: var(--text-secondary);
    opacity: 0.5;
    transition: all 0.3s ease;
}

.current-ip-section:hover .ip-address .bi-clipboard {
    opacity: 1;
    transform: scale(1.1);
}

.current-ip-section .geo-info {
    font-size: 1rem;
    color: var(--text-secondary);
}

/* 卡片样式 */
.card {
    background-color: var(--white);
    border: none;
    border-radius: 16px;
    margin-bottom: 1.5rem;
    box-shadow: 0 4px 12px rgba(0,0,0,0.05);
    transition: box-shadow 0.3s ease, transform 0.3s ease;
}

.card:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 24px rgba(0,0,0,0.08);
}

.card-body {
    padding: 2.5rem;
}

/* 按钮样式 */
.btn {
    font-weight: 600;
    border-radius: 10px;
    padding: 0.7rem 1.4rem;
    font-size: 0.95rem;
    transition: all 0.2s ease-in-out;
    border: 1px solid transparent;
}

.btn-primary {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
    box-shadow: 0 4px 10px rgba(0, 122, 255, 0.2);
}

.btn-primary:hover {
    background-color: var(--primary-hover);
    border-color: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 6px 12px rgba(0, 122, 255, 0.3);
}

.btn-outline-secondary {
    color: var(--text-secondary);
    border-color: var(--border-color);
}

.btn-outline-secondary:hover {
    background-color: var(--bg-light);
    color: var(--text-primary);
    border-color: var(--text-secondary);
}

/* 表单样式 */
.form-control {
    border-radius: 10px;
    padding: 0.85rem 1.25rem;
    border: 1px solid var(--border-color);
    background-color: #fafafa;
    transition: border-color 0.2s ease-in-out, box-shadow 0.2s ease-in-out, background-color 0.2s ease;
}

.form-control:focus {
    border-color: var(--primary-color);
    outline: 0;
    box-shadow: 0 0 0 4px rgba(0, 122, 255, 0.1);
    background-color: var(--white);
}

/* 结果样式 */
.info-item, .batch-result {
    padding: 1.25rem 1.75rem;
    margin-bottom: 1rem;
    border: 1px solid var(--border-color);
    border-radius: 10px;
    background-color: var(--white);
    text-align: left;
    transition: all 0.2s ease;
}

.info-item:hover, .batch-result:hover {
    border-color: var(--primary-color);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.05);
}

.batch-result strong {
    color: var(--text-primary);
}

/* 动画 */
.fade-in {
    animation: fadeIn 0.7s cubic-bezier(0.25, 0.46, 0.45, 0.94) forwards;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(15px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}