/* public/assets/css/finance/exchange.css */
:root {
    --primary: #10b981; --primary-hover: #059669; --primary-light: #d1fae5;
    --bg: #f8fafc; --card: #ffffff; --card-alt: #f1f5f9;
    --text-main: #0f172a; --text-sub: #64748b;
    --border: #e2e8f0; --shadow: 0 20px 40px -15px rgba(0,0,0,0.08);
}

[data-theme="dark"]:root { 
    --bg: #020617; --card: #0f172a; --card-alt: #1e293b;
    --text-main: #f8fafc; --text-sub: #94a3b8; --border: #334155; 
    --shadow: 0 20px 40px -15px rgba(0,0,0,0.5);
    --primary-light: rgba(16,185,129,0.1);
}

.seo-tool-wrapper { 
    width: 100%; max-width: 900px; margin: 0 auto;
    background: var(--bg); border-radius: 20px; overflow: hidden; 
    border: 1px solid var(--border); box-shadow: var(--shadow);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif; color: var(--text-main);
}

/* 渐变玻璃感头部 */
.tool-seo-header { 
    padding: 50px 20px 40px 20px; text-align: center; 
    border-bottom: 1px solid var(--border); 
    background: linear-gradient(180deg, var(--primary-light) 0%, var(--bg) 100%); 
}
.header-icon-wrapper {
    width: 60px; height: 60px; background: white; border-radius: 16px;
    display: flex; align-items: center; justify-content: center;
    font-size: 28px; color: var(--primary); margin: 0 auto 20px auto;
    box-shadow: 0 10px 20px rgba(16,185,129,0.2); border: 1px solid var(--primary-light);
}
[data-theme="dark"] .header-icon-wrapper { background: var(--card); border-color: var(--border); }

.tool-h1 { margin: 0 0 15px 0; font-size: 2rem; font-weight: 900; color: var(--text-main); letter-spacing: -0.5px;}
.tool-description { margin: 0 auto; max-width: 700px; font-size: 1rem; color: var(--text-sub); line-height: 1.6; }

.tool-workspace { padding: 40px 30px; display: flex; flex-direction: column; gap: 40px;}

/* 核心转换器面板 - FinTech 质感 */
.converter-panel { max-width: 650px; margin: 0 auto; width: 100%; }
.converter-box { 
    background: var(--card); border-radius: 24px; padding: 40px; 
    box-shadow: 0 25px 50px -12px rgba(0,0,0,0.1); border: 1px solid var(--border); 
}

.input-label { 
    display: block; font-size: 13px; font-weight: 800; color: var(--text-sub); 
    margin-bottom: 10px; text-transform: uppercase; letter-spacing: 0.5px;
    white-space: nowrap; overflow: hidden; text-overflow: ellipsis; /* 防挤压换行 */
}

/* 输入金额框组 */
.input-section { margin-bottom: 30px; }
.amount-group { 
    display: flex; align-items: center; border: 2px solid var(--border); 
    border-radius: 16px; overflow: hidden; transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1); 
    background: var(--card-alt);
}
.amount-group:focus-within { border-color: var(--primary); box-shadow: 0 0 0 4px var(--primary-light); background: var(--card); transform: translateY(-2px);}
.currency-symbol { padding: 18px 20px; font-size: 22px; font-weight: 900; color: var(--text-sub); background: rgba(0,0,0,0.02);}
.amount-input { 
    flex: 1; border: none; padding: 18px 20px 18px 0; font-size: 28px; font-weight: 900; 
    color: var(--text-main); font-family: 'Consolas', monospace; outline: none; background: transparent; width: 100%;
}

/* 下拉菜单组与交换按钮 */
.currency-selectors { display: flex; align-items: center; gap: 20px; margin-bottom: 35px; position: relative;}
.select-group { flex: 1; display: flex; flex-direction: column; min-width: 0; /* 核心：防止子元素超出边界 */ }

.currency-select { 
    padding: 16px 20px; font-size: 16px; font-weight: 800; border-radius: 16px; 
    border: 2px solid var(--border); background: var(--card-alt); color: var(--text-main); 
    outline: none; cursor: pointer; transition: 0.2s; 
    -webkit-appearance: none; appearance: none; 
    background-image: url("data:image/svg+xml;charset=UTF-8,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='currentColor' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3e%3cpolyline points='6 9 12 15 18 9'%3e%3c/polyline%3e%3c/svg%3e"); 
    background-repeat: no-repeat; background-position: right 1rem center; background-size: 1.2em;
    padding-right: 3rem; 
    white-space: nowrap; overflow: hidden; text-overflow: ellipsis; width: 100%; /* 防下拉选项过长撑破UI */
}
.currency-select:focus { border-color: var(--primary); background: var(--card);}

/* PC 端居中交换按钮 */
.btn-swap { 
    width: 50px; height: 50px; border-radius: 50%; border: 2px solid var(--border); 
    background: var(--card); color: var(--primary); font-size: 20px; cursor: pointer; 
    display: flex; align-items: center; justify-content: center; 
    box-shadow: 0 4px 10px rgba(0,0,0,0.05); transition: 0.3s; flex-shrink: 0; align-self: flex-end; margin-bottom: 2px;
}
.btn-swap:hover { background: var(--primary); color: white; border-color: var(--primary); transform: rotate(180deg); }

/* 换算结果区 */
.result-section { text-align: center; padding-top: 30px; border-top: 2px dashed var(--border); }
.result-label { font-size: 14px; font-weight: 800; color: var(--text-sub); text-transform: uppercase; margin-bottom: 15px; letter-spacing: 1px;}
.result-value { display: flex; align-items: baseline; justify-content: center; gap: 10px; flex-wrap: wrap;}
.highlight-value { font-size: 48px; font-weight: 900; color: var(--primary); font-family: 'Consolas', monospace; letter-spacing: -1px; word-break: break-word;}
.currency-code { font-size: 24px; font-weight: 800; color: var(--text-main); margin-bottom: 6px;}
.rate-hint { 
    font-size: 13px; font-weight: 700; color: var(--text-sub); margin-top: 15px; font-family: 'Consolas', monospace; 
    background: var(--card-alt); padding: 6px 16px; border-radius: 20px; display: inline-block;
    white-space: nowrap; overflow: hidden; text-overflow: ellipsis; max-width: 100%;
}

/* 底部牌价板 */
.rates-board-panel { background: var(--card); border-radius: 24px; padding: 40px; box-shadow: 0 10px 30px rgba(0,0,0,0.03); border: 1px solid var(--border); }
.board-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 25px; padding-bottom: 20px; border-bottom: 1px solid var(--border);}
.board-title { margin: 0; font-size: 18px; font-weight: 900; color: var(--text-main); white-space: nowrap;}
.board-title i { color: var(--primary); margin-right: 8px;}
.board-base-hint { font-size: 13px; font-weight: 900; color: white; background: var(--text-sub); padding: 6px 14px; border-radius: 20px; white-space: nowrap;}

.state-display { text-align: center; color: var(--text-sub); font-size: 15px; padding: 40px 20px; font-weight: bold;}
.state-display i { font-size: 32px; margin-bottom: 15px; display: block; color: var(--border);}

/* 确保网格即使在极小屏幕上也是完美的两列或单列 */
.rates-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(140px, 1fr)); gap: 15px; }
.rate-card { 
    border: 1px solid var(--border); border-radius: 16px; padding: 16px; display: flex; flex-direction: column; gap: 6px; 
    transition: 0.2s; background: var(--bg); min-width: 0; /* 极其重要防溢出 */
}
.rate-card:hover { border-color: var(--primary); transform: translateY(-3px); box-shadow: 0 10px 20px rgba(16,185,129,0.1);}
.rate-currency { font-size: 16px; font-weight: 900; color: var(--text-main); display: flex; align-items: center; justify-content: space-between;}
.rate-val { font-family: 'Consolas', monospace; font-size: 18px; color: var(--primary); font-weight: 900;}
.rate-desc { font-size: 12px; font-weight: bold; color: var(--text-sub); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; display: block;}

/* SEO 长文本区 */
.seo-article-content { padding: 50px 40px; background: var(--card); border-top: 1px solid var(--border); color: var(--text-main); line-height: 1.8; }
.seo-article-content h2 { font-size: 1.6rem; font-weight: 900; margin-bottom: 25px; }
.seo-article-content h3 { font-size: 1.2rem; font-weight: 800; margin: 30px 0 15px 0; }
.seo-article-content ul { padding-left: 20px; }
.seo-article-content li { margin-bottom: 10px; color: var(--text-sub);}
.seo-article-content p { color: var(--text-sub); }


/* =====================================================================
   【重点】移动端自适应黑科技 (Overlapping Layout 镂空堆叠)
   ===================================================================== */
@media (max-width: 650px) {
    .tool-h1 { font-size: 1.6rem; }
    .tool-workspace { padding: 20px 15px; gap: 20px;}
    .converter-box, .rates-board-panel { padding: 25px 20px; border-radius: 20px;}
    .amount-input { font-size: 24px; padding: 14px 16px 14px 0;}
    .currency-symbol { padding: 14px 16px; }

    /* 移动端核心重构：上下堆叠式排版 */
    .currency-selectors { 
        flex-direction: column; gap: 15px; align-items: stretch; 
        background: var(--card-alt); padding: 15px; border-radius: 20px; border: 1px solid var(--border);
        margin-bottom: 30px;
    }
    
    .select-group { width: 100%; }
    .select-group label { display: none; /* 移动端隐藏 Label 更清爽，靠选择框足够 */ }
    
    .currency-select { 
        border: 1px solid var(--border); background: var(--card);
        padding: 12px 16px; font-size: 15px; border-radius: 12px;
    }

    /* 绝对定位魔法：悬浮在两个选择框正中间 */
    .btn-swap { 
        position: absolute; top: 50%; left: 85%; transform: translate(-50%, -50%); 
        align-self: center; z-index: 10; margin: 0;
        width: 44px; height: 44px;
        /* 使用描边伪造出“切断”背景的镂空视觉效果 */
        border: 4px solid var(--card-alt); 
        box-shadow: 0 4px 10px rgba(0,0,0,0.1);
    }
    .btn-swap:hover { transform: translate(-50%, -50%) rotate(180deg); }

    .highlight-value { font-size: 36px; }
    .currency-code { font-size: 20px; }

    /* 保证移动端底部牌价板强行两列，字号微调不溢出 */
    .rates-grid { grid-template-columns: repeat(2, 1fr); gap: 10px;}
    .rate-card { padding: 12px; border-radius: 12px;}
    .rate-val { font-size: 15px; }
    .rate-currency { font-size: 14px; }
    .board-header { flex-direction: column; align-items: flex-start; gap: 10px;}
    
    .seo-article-content { padding: 30px 20px; }
}