/* ========== 单位换算工具页专用样式 ========== */
/* 版本: 1.0.0 | 栏目: 工具资源-单位换算 | 作者: 芦笛 */

/* ===== 栏目专属色变量 ===== */
:root {
    --color-unit-primary: #7B7570;
    --color-unit-dark: #5A5652;
    --color-unit-light: #9E9893;
    --color-unit-accent: #8B857F;
    --color-canvas-bg: #F8F6F3;
}

/* ===== 页面头部 ===== */
.page-header {
    position: relative;
    min-height: 55vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #7B7570, #5A5652, #6B6560, #4A4642);
    background-size: 400% 400%;
    animation: gradient-shift 15s ease infinite;
    overflow: hidden;
}

.page-header::before {
    content: '';
    position: absolute;
    inset: 0;
    background: url("data:image/svg+xml,%3Csvg width='100' height='100' viewBox='0 0 100 100' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.02'%3E%3Cpath d='M11 18c3.866 0 7-3.134 7-7s-3.134-7-7-7-7 3.134-7 7 3.134 7 7 7zm48 25c3.866 0 7-3.134 7-7s-3.134-7-7-7-7 3.134-7 7 3.134 7 7 7zm-43-7c1.657 0 3-1.343 3-3s-1.343-3-3-3-3 1.343-3 3 1.343 3 3 3zm63 31c1.657 0 3-1.343 3-3s-1.343-3-3-3-3 1.343-3 3 1.343 3 3 3zM34 90c1.657 0 3-1.343 3-3s-1.343-3-3-3-3 1.343-3 3 1.343 3 3 3zm56-76c1.657 0 3-1.343 3-3s-1.343-3-3-3-3 1.343-3 3 1.343 3 3 3zM12 86c2.21 0 4-1.79 4-4s-1.79-4-4-4-4 1.79-4 4 1.79 4 4 4zm28-65c2.21 0 4-1.79 4-4s-1.79-4-4-4-4 1.79-4 4 1.79 4 4 4zm23-11c2.76 0 5-2.24 5-5s-2.24-5-5-5-5 2.24-5 5 2.24 5 5 5zm-6 60c2.21 0 4-1.79 4-4s-1.79-4-4-4-4 1.79-4 4 1.79 4 4 4zm29 22c2.76 0 5-2.24 5-5s-2.24-5-5-5-5 2.24-5 5 2.24 5 5 5zM32 63c2.76 0 5-2.24 5-5s-2.24-5-5-5-5 2.24-5 5 2.24 5 5 5zm57-13c2.76 0 5-2.24 5-5s-2.24-5-5-5-5 2.24-5 5 2.24 5 5 5zm-9-21c1.105 0 2-.895 2-2s-.895-2-2-2-2 .895-2 2 .895 2 2 2zM60 91c1.105 0 2-.895 2-2s-.895-2-2-2-2 .895-2 2 .895 2 2 2zM35 41c1.105 0 2-.895 2-2s-.895-2-2-2-2 .895-2 2 .895 2 2 2zM12 60c1.105 0 2-.895 2-2s-.895-2-2-2-2 .895-2 2 .895 2 2 2z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
    pointer-events: none;
}

.page-header::after {
    content: '';
    position: absolute;
    bottom: -1px;
    left: 0;
    right: 0;
    height: 100px;
    background: var(--color-cream);
    clip-path: ellipse(70% 100% at 50% 100%);
}

.page-header-content {
    position: relative;
    z-index: 1;
    text-align: center;
    color: white;
    padding: var(--space-xl) var(--space-md) var(--space-lg);
    max-width: 800px;
}

.page-title {
    font-family: var(--font-display);
    font-size: clamp(2.5rem, 6vw, 4rem);
    font-weight: 900;
    margin-bottom: var(--space-sm);
    letter-spacing: 12px;
    text-shadow: 0 4px 20px rgba(0,0,0,0.3);
}

.page-subtitle {
    font-size: 1.05rem;
    opacity: 0.75;
    max-width: 560px;
    margin: 0 auto;
    line-height: 2;
    font-weight: 300;
    letter-spacing: 1px;
}

.page-header-deco {
    position: absolute;
    width: 200px;
    height: 200px;
    border: 1px solid rgba(196, 167, 125, 0.15);
    border-radius: 50%;
    pointer-events: none;
}

.page-header-deco:nth-child(1) {
    top: 10%;
    left: 5%;
    width: 150px;
    height: 150px;
    animation: spin-slow 60s linear infinite;
}

.page-header-deco:nth-child(2) {
    bottom: 15%;
    right: 8%;
    width: 100px;
    height: 100px;
    animation: spin-slow 45s linear infinite reverse;
}

.page-header-deco:nth-child(3) {
    top: 30%;
    right: 15%;
    width: 60px;
    height: 60px;
    border-color: rgba(196, 167, 125, 0.1);
    animation: spin-slow 30s linear infinite;
}

/* ===== 面包屑导航 ===== */
.breadcrumb-wrap {
    background: var(--color-cream);
    padding: var(--space-sm) 0;
    border-bottom: 1px solid rgba(30, 30, 36, 0.04);
}

.breadcrumb-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-md);
}

/* ===== 工具介绍区 ===== */
.intro-section {
    padding: var(--space-2xl) var(--space-md);
    background: var(--color-cream);
}

.intro-container {
    max-width: 1200px;
    margin: 0 auto;
}

.intro-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-xl);
    align-items: start;
    margin-top: var(--space-lg);
}

@media (max-width: 968px) {
    .intro-grid {
        grid-template-columns: 1fr;
    }
}

.intro-text h3 {
    font-family: var(--font-display);
    font-size: clamp(1.3rem, 2.5vw, 1.6rem);
    font-weight: 700;
    color: var(--color-dark);
    margin-bottom: var(--space-sm);
    letter-spacing: 2px;
}

.intro-text p {
    font-size: 0.95rem;
    color: var(--color-warm-gray);
    line-height: 2;
    margin-bottom: var(--space-md);
    font-weight: 300;
}

.intro-text strong {
    color: var(--color-dark);
    font-weight: 600;
}

.intro-features {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-sm);
    margin-top: var(--space-md);
}

.feature-item {
    display: flex;
    align-items: flex-start;
    gap: var(--space-sm);
    padding: var(--space-sm);
    background: white;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
}

.feature-icon {
    font-size: 1.4rem;
    flex-shrink: 0;
    line-height: 1;
}

.feature-item div {
    display: flex;
    flex-direction: column;
}

.feature-item strong {
    font-size: 0.9rem;
    color: var(--color-dark);
    margin-bottom: 2px;
}

.feature-item span {
    font-size: 0.78rem;
    color: var(--color-warm-gray);
    font-weight: 300;
}

.intro-visual {
    position: relative;
    border-radius: var(--radius-lg);
    overflow: hidden;
    background: var(--color-canvas-bg);
    box-shadow: var(--shadow-lg);
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: var(--space-md);
}

.intro-visual canvas {
    width: 100%;
    height: auto;
    aspect-ratio: 4/3;
}

.canvas-caption {
    font-size: 0.75rem;
    color: var(--color-warm-gray);
    margin-top: var(--space-sm);
    text-align: center;
    font-weight: 300;
}

/* ===== 工具区块通用 ===== */
.tool-section {
    padding: var(--space-2xl) var(--space-md);
    background: white;
}

.tool-section.alt-bg {
    background: linear-gradient(180deg, var(--color-cream) 0%, white 50%, var(--color-cream) 100%);
}

.tool-container {
    max-width: 1200px;
    margin: 0 auto;
}

/* ===== 换算器主面板 ===== */
.converter-main {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-xl);
    margin-top: var(--space-lg);
    align-items: start;
}

@media (max-width: 968px) {
    .converter-main {
        grid-template-columns: 1fr;
    }
}

.converter-panel {
    background: var(--color-cream);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    border: 1px solid rgba(30, 30, 36, 0.04);
}

.converter-input-group {
    margin-bottom: var(--space-md);
}

.converter-input-group label {
    display: block;
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--color-warm-gray);
    margin-bottom: 6px;
    letter-spacing: 0.5px;
}

.input-with-unit {
    display: flex;
    gap: 8px;
    align-items: center;
}

.input-with-unit input {
    flex: 1;
    padding: 0.7rem 1rem;
    border: 1.5px solid rgba(30, 30, 36, 0.08);
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-family: var(--font-mono);
    background: white;
    color: var(--color-dark);
    transition: var(--transition-fast);
    min-width: 0;
}

.input-with-unit input:focus {
    outline: none;
    border-color: var(--color-accent);
    box-shadow: 0 0 0 3px rgba(196, 167, 125, 0.15);
}

.input-with-unit input[readonly] {
    background: rgba(30, 30, 36, 0.02);
    cursor: text;
}

.input-with-unit select {
    padding: 0.7rem 0.8rem;
    border: 1.5px solid rgba(30, 30, 36, 0.08);
    border-radius: var(--radius-md);
    font-size: 0.85rem;
    font-family: var(--font-body);
    background: white;
    color: var(--color-dark);
    cursor: pointer;
    min-width: 100px;
    transition: var(--transition-fast);
}

.input-with-unit select:focus {
    outline: none;
    border-color: var(--color-accent);
}

.input-hint {
    font-size: 0.75rem;
    color: var(--color-warm-gray);
    margin-top: 4px;
    font-weight: 300;
}

.converter-row {
    display: flex;
    align-items: flex-end;
    gap: var(--space-sm);
    margin-bottom: var(--space-md);
}

.converter-row .converter-input-group {
    flex: 1;
    margin-bottom: 0;
}

.swap-btn {
    width: 42px;
    height: 42px;
    border-radius: var(--radius-full);
    border: 1.5px solid rgba(30, 30, 36, 0.1);
    background: white;
    color: var(--color-unit-primary);
    font-size: 1.2rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition-fast);
    flex-shrink: 0;
    margin-bottom: 2px;
}

.swap-btn:hover {
    background: var(--color-unit-primary);
    color: white;
    border-color: var(--color-unit-primary);
    transform: rotate(180deg);
}

.copy-btn {
    width: 100%;
    padding: 0.7rem;
    border: 1.5px dashed rgba(30, 30, 36, 0.1);
    background: white;
    border-radius: var(--radius-md);
    color: var(--color-unit-primary);
    font-size: 0.85rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    letter-spacing: 1px;
}

.copy-btn:hover {
    border-color: var(--color-accent);
    background: rgba(196, 167, 125, 0.05);
    color: var(--color-dark);
}

.copy-btn.copied {
    border-color: #4CAF50;
    background: rgba(76, 175, 80, 0.08);
    color: #4CAF50;
}

/* ===== 批量换算表 ===== */
.converter-batch {
    background: var(--color-cream);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    border: 1px solid rgba(30, 30, 36, 0.04);
    max-width: 100%;
    overflow: hidden;
}

.converter-batch h4 {
    font-family: var(--font-display);
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--color-dark);
    margin-bottom: 4px;
    letter-spacing: 1px;
}

.batch-hint {
    font-size: 0.8rem;
    color: var(--color-warm-gray);
    margin-bottom: var(--space-sm);
    font-weight: 300;
}

.batch-table-wrap {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    border-radius: var(--radius-md);
    background: white;
    box-shadow: var(--shadow-sm);
    max-width: 100%;
}

.batch-table {
    width: 100%;
    min-width: 520px;
    border-collapse: collapse;
    font-size: 0.75rem;
    font-family: var(--font-mono);
    table-layout: fixed;
}

.batch-table th,
.batch-table td {
    padding: 6px 4px;
    text-align: center;
    border-bottom: 1px solid rgba(30, 30, 36, 0.04);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    width: 14.28%;
}

.batch-table th {
    background: var(--color-dark);
    color: white;
    font-weight: 500;
    font-size: 0.7rem;
    letter-spacing: 0.5px;
    position: sticky;
    top: 0;
}

.batch-table tbody tr:hover {
    background: rgba(196, 167, 125, 0.04);
}

.batch-table tbody tr:nth-child(even) {
    background: rgba(30, 30, 36, 0.01);
}

.batch-table tbody tr:nth-child(even):hover {
    background: rgba(196, 167, 125, 0.04);
}

/* 批量表格响应式 */
@media (max-width: 640px) {
    .batch-table {
        font-size: 0.68rem;
        min-width: 420px;
    }
    .batch-table th,
    .batch-table td {
        padding: 5px 2px;
    }
}

/* ===== 可视化区域 ===== */
.converter-visual {
    position: relative;
    border-radius: var(--radius-lg);
    overflow: hidden;
    background: var(--color-canvas-bg);
    box-shadow: var(--shadow-sm);
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: var(--space-md);
    border: 1px solid rgba(30, 30, 36, 0.04);
}

.converter-visual canvas {
    width: 100%;
    height: auto;
    aspect-ratio: 16/9;
}

/* ===== 单位知识卡片 ===== */
.unit-knowledge {
    margin-top: var(--space-xl);
}

.unit-knowledge h4 {
    font-family: var(--font-display);
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--color-dark);
    margin-bottom: var(--space-md);
    letter-spacing: 1px;
}

.knowledge-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-md);
}

@media (max-width: 968px) {
    .knowledge-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 640px) {
    .knowledge-grid {
        grid-template-columns: 1fr;
    }
}

.knowledge-card {
    background: var(--color-cream);
    border-radius: var(--radius-lg);
    padding: var(--space-md);
    border: 1px solid rgba(30, 30, 36, 0.04);
    transition: var(--transition-normal);
}

.knowledge-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.knowledge-icon {
    width: 44px;
    height: 44px;
    border-radius: var(--radius-md);
    background: linear-gradient(135deg, var(--color-unit-primary), var(--color-unit-dark));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.85rem;
    font-weight: 700;
    color: white;
    font-family: var(--font-mono);
    margin-bottom: var(--space-sm);
}

.knowledge-card h5 {
    font-family: var(--font-display);
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-dark);
    margin-bottom: 6px;
    letter-spacing: 1px;
}

.knowledge-card p {
    font-size: 0.82rem;
    color: var(--color-warm-gray);
    line-height: 1.8;
    font-weight: 300;
    margin-bottom: var(--space-sm);
}

.knowledge-meta {
    font-size: 0.75rem;
    color: var(--color-unit-primary);
    font-family: var(--font-mono);
    background: rgba(123, 117, 112, 0.06);
    padding: 4px 10px;
    border-radius: var(--radius-full);
    display: inline-block;
}

/* ===== 快速换算速查 ===== */
.quick-conversions {
    margin-top: var(--space-xl);
}

.quick-conversions h4 {
    font-family: var(--font-display);
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--color-dark);
    margin-bottom: var(--space-md);
    letter-spacing: 1px;
}

.quick-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-sm);
}

@media (max-width: 968px) {
    .quick-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 640px) {
    .quick-grid {
        grid-template-columns: 1fr;
    }
}

.quick-item {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: var(--space-sm) var(--space-md);
    background: var(--color-cream);
    border-radius: var(--radius-md);
    font-size: 0.85rem;
    border: 1px solid rgba(30, 30, 36, 0.04);
    transition: var(--transition-fast);
}

.quick-item:hover {
    background: white;
    box-shadow: var(--shadow-sm);
}

.quick-val {
    font-family: var(--font-mono);
    font-weight: 600;
    color: var(--color-dark);
    white-space: nowrap;
}

.quick-eq {
    color: var(--color-accent);
    font-weight: 700;
    flex-shrink: 0;
}

.quick-res {
    font-family: var(--font-mono);
    color: var(--color-unit-primary);
    white-space: nowrap;
}

/* ===== 温度参考点 ===== */
.temp-reference {
    margin-top: var(--space-xl);
}

.temp-reference h4 {
    font-family: var(--font-display);
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--color-dark);
    margin-bottom: var(--space-md);
    letter-spacing: 1px;
}

.ref-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-md);
}

@media (max-width: 968px) {
    .ref-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 640px) {
    .ref-grid {
        grid-template-columns: 1fr;
    }
}

.ref-item {
    background: var(--color-cream);
    border-radius: var(--radius-lg);
    padding: var(--space-md);
    text-align: center;
    border: 1px solid rgba(30, 30, 36, 0.04);
    transition: var(--transition-normal);
}

.ref-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.ref-temp {
    display: block;
    font-family: var(--font-mono);
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--color-unit-primary);
    margin-bottom: 4px;
}

.ref-name {
    display: block;
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--color-dark);
    margin-bottom: 4px;
}

.ref-desc {
    display: block;
    font-size: 0.78rem;
    color: var(--color-warm-gray);
    font-weight: 300;
}

/* ===== 公式速查区 ===== */
.formula-section {
    padding: var(--space-2xl) var(--space-md);
    background: white;
}

.formula-section.alt-bg {
    background: linear-gradient(180deg, var(--color-cream) 0%, white 50%, var(--color-cream) 100%);
}

.formula-container {
    max-width: 1200px;
    margin: 0 auto;
}

.formula-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-md);
    margin-top: var(--space-lg);
}

@media (max-width: 1024px) {
    .formula-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 640px) {
    .formula-grid {
        grid-template-columns: 1fr;
    }
}

.formula-card {
    background: var(--color-cream);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    border: 1px solid rgba(30, 30, 36, 0.04);
    transition: var(--transition-normal);
}

.formula-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.formula-card h5 {
    font-family: var(--font-display);
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-dark);
    margin-bottom: var(--space-sm);
    letter-spacing: 1px;
    padding-bottom: var(--space-sm);
    border-bottom: 1px solid rgba(30, 30, 36, 0.06);
}

.formula-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.formula-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 6px 0;
    border-bottom: 1px dashed rgba(30, 30, 36, 0.06);
}

.formula-item:last-child {
    border-bottom: none;
}

.formula-item code {
    font-family: var(--font-mono);
    font-size: 0.78rem;
    background: rgba(30, 30, 36, 0.04);
    padding: 2px 8px;
    border-radius: 4px;
    color: var(--color-unit-primary);
    font-weight: 500;
}

.formula-item span {
    font-size: 0.8rem;
    color: var(--color-warm-gray);
    font-family: var(--font-mono);
    font-weight: 300;
}

/* ===== CTA 区 ===== */
.cta-section {
    padding: var(--space-2xl) var(--space-md);
    background: linear-gradient(135deg, var(--color-unit-dark), #4A4642, var(--color-unit-primary));
    background-size: 400% 400%;
    animation: gradient-shift 15s ease infinite;
    text-align: center;
    color: white;
    position: relative;
    overflow: hidden;
}

.cta-section::before {
    content: '';
    position: absolute;
    inset: 0;
    background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.02'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}

.cta-content {
    position: relative;
    z-index: 1;
    max-width: 600px;
    margin: 0 auto;
}

.cta-title {
    font-family: var(--font-display);
    font-size: clamp(1.8rem, 3.5vw, 2.6rem);
    font-weight: 700;
    margin-bottom: var(--space-sm);
    letter-spacing: 3px;
}

.cta-desc {
    font-size: 1rem;
    opacity: 0.7;
    margin-bottom: var(--space-lg);
    font-weight: 300;
    line-height: 1.9;
}

.cta-buttons {
    display: flex;
    gap: var(--space-sm);
    justify-content: center;
    flex-wrap: wrap;
}

/* ===== Toast 提示 ===== */
.toast {
    position: fixed;
    bottom: 80px;
    left: 50%;
    transform: translateX(-50%) translateY(20px);
    background: var(--color-dark);
    color: white;
    padding: 12px 24px;
    border-radius: var(--radius-full);
    font-size: 0.9rem;
    z-index: 9999;
    opacity: 0;
    transition: all 0.3s ease;
    pointer-events: none;
    box-shadow: var(--shadow-lg);
    white-space: nowrap;
}

.toast.show {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}

/* ===== 响应式补充 ===== */
@media (max-width: 768px) {
    .page-title {
        letter-spacing: 6px;
    }

    .cta-buttons {
        flex-direction: column;
        align-items: center;
    }

    .cta-buttons .btn {
        width: 100%;
        max-width: 280px;
    }

    .intro-features {
        grid-template-columns: 1fr;
    }

    .converter-row {
        flex-direction: column;
        align-items: stretch;
    }

    .swap-btn {
        align-self: center;
        transform: rotate(90deg);
        margin: var(--space-xs) 0;
    }

    .swap-btn:hover {
        transform: rotate(270deg);
    }

    .input-with-unit {
        flex-wrap: wrap;
    }

    .input-with-unit select {
        min-width: 80px;
        flex: 1;
    }
}

/* ===== 动画关键帧补充 ===== */
@keyframes gradient-shift {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

@keyframes spin-slow {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}