/* --- 全局变量与重置 --- */
:root {
    --navy-deep: #001529;
    --navy-light: #00284d;
    --gold: #D4AF37;
    --gold-hover: #F4D03F;
    --white: #FFFFFF;
    --text-gray: #a0a0a0;
    --disabled-gray: #3a4b5e;
}

* {
    box-sizing: border-box;
    outline: none;
    -webkit-tap-highlight-color: transparent;
}

body {
    margin: 0;
    padding: 0;
    background-color: var(--navy-deep);
    color: var(--white);
    font-family: "PingFang SC", "Microsoft YaHei", "Heiti SC", "SimHei", Impact, sans-serif;
    font-weight: 700; /* 默认粗体 */
    line-height: 1.5;
}

a { text-decoration: none; color: inherit; }

/* --- 布局容器 --- */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* --- 顶部区域 --- */
header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-bottom: 20px;
    border-bottom: 2px solid var(--gold);
    margin-bottom: 20px;
    flex-wrap: wrap;
    gap: 15px;
}

.logo h1 {
    font-size: 24px;
    margin: 0;
    color: var(--gold);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.filter-toggle-btn {
    background-color: var(--gold);
    color: var(--navy-deep);
    border: none;
    padding: 10px 20px;
    font-size: 16px;
    font-weight: 900;
    cursor: pointer;
    border-radius: 4px;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 8px;
}

.filter-toggle-btn:hover {
    background-color: var(--white);
}

/* --- 筛选面板区域 --- */
#filter-panel {
    background-color: var(--navy-light);
    padding: 20px;
    border-radius: 8px;
    margin-bottom: 30px;
    border: 1px solid rgba(212, 175, 55, 0.3);
    display: none; /* 默认隐藏 */
}

#filter-panel.active {
    display: block;
    animation: fadeIn 0.5s;
}

.step-block {
    margin-bottom: 25px;
    border-left: 4px solid var(--disabled-gray); /* 默认灰色，激活变金 */
    padding-left: 15px;
    opacity: 0.3; /* 默认半透明 */
    pointer-events: none; /* 默认不可点 */
    transition: all 0.5s ease;
    display: none; /* 默认不显示，JS控制显示 */
}

/* 第一步默认显示 */
#step-A {
    display: block;
    opacity: 1;
    pointer-events: auto;
    border-left-color: var(--gold);
}

.step-block.visible {
    display: block;
    animation: slideDown 0.5s forwards;
}

.step-block.active-step {
    opacity: 1;
    pointer-events: auto;
    border-left-color: var(--gold);
}

.step-title {
    color: var(--gold);
    font-size: 18px;
    margin-bottom: 15px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.options-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

/* 筛选按钮样式 */
.opt-btn {
    background: transparent;
    border: 1px solid rgba(255, 255, 255, 0.3);
    color: var(--white);
    padding: 10px 18px;
    border-radius: 20px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 600;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    gap: 8px;
}

.opt-btn:hover {
    border-color: var(--gold);
    color: var(--gold);
    background-color: rgba(212, 175, 55, 0.05);
}

.opt-btn.selected {
    background-color: var(--gold);
    color: var(--navy-deep);
    border-color: var(--gold);
    box-shadow: 0 0 10px rgba(212, 175, 55, 0.4);
}

.opt-btn.parent-active {
    border-color: var(--gold);
    color: var(--gold);
    background-color: rgba(212, 175, 55, 0.1);
}

/* 二级菜单容器 */
.sub-options {
    display: none; /* 默认隐藏 */
    margin-top: 15px;
    padding: 15px;
    background: rgba(0, 21, 41, 0.5); /* 更深的背景 */
    border-radius: 8px;
    width: 100%;
    border: 1px dashed rgba(255, 255, 255, 0.1);
}

.sub-options.show {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    animation: fadeIn 0.3s;
}

/* --- 结果展示区域 --- */
.results-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
    border-top: 1px solid rgba(255,255,255,0.1);
    padding-top: 20px;
}

.results-count {
    font-size: 14px;
    color: var(--text-gray);
}

.flags-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 15px;
    margin-bottom: auto; /* Push footer down */
}

/* 国旗按钮卡片 */
.flag-card {
    background-color: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    padding: 15px;
    border-radius: 6px;
    display: flex;
    align-items: center;
    gap: 12px;
    cursor: pointer;
    transition: transform 0.2s, background 0.2s;
    text-decoration: none;
}

.flag-card:hover {
    background-color: rgba(212, 175, 55, 0.1);
    border-color: var(--gold);
    transform: translateY(-2px);
}

.flag-icon {
    font-size: 24px;
    line-height: 1;
    font-family: "Apple Color Emoji", "Segoe UI Emoji", "Noto Color Emoji", sans-serif;
}

.flag-name {
    font-size: 14px;
    font-weight: 700;
    color: var(--white);
    display: flex;
    flex-direction: column;
}

.flag-name span {
    font-size: 12px;
    color: var(--text-gray);
    font-weight: 400;
}

/* 隐藏动画 */
.hidden {
    display: none !important;
}

/* 没钱的彩蛋样式 */
#no-money-message {
    text-align: center;
    padding: 50px 20px;
    color: var(--gold);
    display: none;
}

#no-money-message i {
    font-size: 60px;
    margin-bottom: 20px;
}

#no-money-message h2 {
    font-size: 24px;
}

.reset-hint {
    font-size: 12px;
    color: var(--text-gray);
    margin-left: 10px;
    font-weight: 400;
    opacity: 0;
    transition: opacity 0.3s;
}

.step-block.active-step .reset-hint {
    opacity: 1;
}

/* --- 页尾样式 --- */
footer {
    margin-top: 50px;
    padding: 30px 0 20px 0;
    border-top: 1px solid rgba(212, 175, 55, 0.2);
    text-align: center;
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}

.footer-btn {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 12px 25px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--gold);
    border-radius: 50px;
    color: var(--gold);
    font-size: 15px;
    font-weight: 700;
    transition: all 0.3s ease;
    text-decoration: none;
}

.footer-btn:hover {
    background: var(--gold);
    color: var(--navy-deep);
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(212, 175, 55, 0.3);
}

.footer-btn i {
    font-size: 20px;
}

.copyright {
    font-size: 12px;
    color: var(--text-gray);
    font-weight: 400;
    opacity: 0.7;
    letter-spacing: 0.5px;
}

/* --- 移动端适配 --- */
@media (max-width: 768px) {
    .flags-container {
        grid-template-columns: repeat(2, 1fr);
    }
    .step-title {
        font-size: 16px;
    }
    .opt-btn {
        padding: 8px 12px;
        font-size: 13px;
    }
    .footer-links {
        flex-direction: column;
        align-items: center;
    }
    .footer-btn {
        width: 100%;
        justify-content: center;
        max-width: 300px;
    }
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(-5px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes slideDown {
    from { opacity: 0; transform: translateY(-10px); }
    to { opacity: 1; transform: translateY(0); }
}