/* 日新科宇汽车用品（大连）有限公司 - 精益制造官网样式 */

:root {
    --color-ink: #0f172a;
    --color-body: #f7f7f4;
    --color-muted: #5c6673;
    --color-line: #e5e7eb;
    --color-panel: #ffffff;
    --color-panel-soft: #f2f3f5;
    --color-accent: #c1121f;
    --color-accent-soft: #fcebed;
    --color-contrast: #1c2942;
    --shadow-soft: 0 18px 48px rgba(15, 23, 42, 0.08);
    --shadow-card: 0 12px 32px rgba(15, 23, 42, 0.06);
    --max-width: 1240px;
    --header-height: 76px;
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 18px;
    --radius-full: 999px;
    --spacing-1: 6px;
    --spacing-2: 12px;
    --spacing-3: 18px;
    --spacing-4: 24px;
    --spacing-5: 32px;
    --spacing-6: 48px;
    --spacing-7: 72px;
    --font-family-primary: 'Noto Sans SC', 'Hiragino Sans GB', 'PingFang SC', 'Inter', system-ui, -apple-system, sans-serif;
    --font-family-mono: 'SFMono-Regular', Menlo, Monaco, Consolas, monospace;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family-primary);
    color: var(--color-ink);
    background: var(--color-body);
    line-height: 1.7;
    letter-spacing: 0.01em;
}

a {
    color: var(--color-contrast);
    text-decoration: none;
    transition: color 0.2s ease, border-color 0.2s ease, opacity 0.2s ease;
}

a:hover {
    color: var(--color-accent);
}

img {
    max-width: 100%;
    display: block;
    border-radius: var(--radius-md);
}

.container {
    width: 100%;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-4);
}

main {
    margin-top: var(--header-height);
}

section {
    padding: var(--spacing-7) 0;
}

.section-compact {
    padding: var(--spacing-6) 0;
}

.section-heading {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-2);
    margin-bottom: var(--spacing-5);
}

.section-heading .eyebrow {
    font-size: 0.85rem;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--color-muted);
}

.section-heading h2 {
    font-size: 2rem;
    font-weight: 700;
    letter-spacing: 0.02em;
}

.section-lead {
    max-width: 720px;
    color: var(--color-muted);
}

.grid {
    display: grid;
    gap: var(--spacing-5);
}

.grid-4 {
    grid-template-columns: repeat(4, 1fr);
}

.grid-3 {
    grid-template-columns: repeat(3, 1fr);
}

.grid-2 {
    grid-template-columns: repeat(2, 1fr);
}

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

@media (max-width: 1080px) {
    .grid-4 {
        grid-template-columns: repeat(2, 1fr);
    }
    .grid-3 {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .grid-4,
    .grid-3,
    .grid-2 {
        grid-template-columns: 1fr;
    }
}

/* Header & Navigation */
header {
    position: fixed;
    inset: 0 0 auto 0;
    height: var(--header-height);
    background: rgba(255, 255, 255, 0.96);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(0, 0, 0, 0.04);
    z-index: 1000;
    display: flex;
    align-items: center;
}

.header-container {
    display: grid;
    grid-template-columns: auto 1fr auto;
    align-items: center;
    gap: var(--spacing-4);
    width: 100%;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-4);
}

.logo {
    font-weight: 700;
    letter-spacing: 0.02em;
    text-transform: none;
    color: var(--color-contrast);
    display: flex;
    flex-direction: column;
    line-height: 1.2;
}

.logo span {
    font-size: 0.98rem;
    white-space: nowrap;
}

.logo small {
    font-size: 0.75rem;
    color: var(--color-muted);
    letter-spacing: 0.08em;
}

nav {
    display: flex;
    justify-content: center;
}

nav ul {
    list-style: none;
    display: flex;
    align-items: center;
    gap: var(--spacing-4);
}

nav a {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 10px 6px;
    font-size: 0.95rem;
    letter-spacing: 0.08em;
    color: var(--color-ink);
    border-bottom: 2px solid transparent;
}

nav a:hover {
    border-color: var(--color-accent);
    color: var(--color-ink);
}

.nav-actions {
    display: flex;
    gap: var(--spacing-2);
    align-items: center;
}

/* Dropdown */
.dropdown {
    position: relative;
}

.dropdown-menu {
    position: absolute;
    top: calc(100% + 4px);
    left: 0;
    min-width: 220px;
    background: var(--color-panel);
    border: 1px solid var(--color-line);
    box-shadow: var(--shadow-card);
    border-radius: var(--radius-md);
    padding: var(--spacing-2) 0;
    opacity: 0;
    visibility: hidden;
    transform: translateY(8px);
    transition: all 0.2s ease;
}

.dropdown:hover .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dropdown-menu li {
    width: 100%;
}

.dropdown-menu a {
    width: 100%;
    padding: 10px var(--spacing-4);
    border: none;
    letter-spacing: 0.02em;
}

.dropdown-menu a:hover {
    background: var(--color-panel-soft);
}

.mobile-menu-toggle {
    display: none;
    background: none;
    border: 1px solid var(--color-line);
    border-radius: var(--radius-sm);
    padding: 8px 10px;
    font-size: 1.2rem;
    color: var(--color-ink);
}

@media (max-width: 900px) {
    nav ul {
        position: absolute;
        top: var(--header-height);
        left: 0;
        right: 0;
        flex-direction: column;
        align-items: flex-start;
        gap: 0;
        background: #ffffff;
        border-bottom: 1px solid var(--color-line);
        overflow: hidden;
        max-height: 0;
        transition: max-height 0.3s ease;
        box-shadow: var(--shadow-card);
        z-index: 999;
    }

    nav ul.active {
        max-height: 520px;
    }

    nav li {
        width: 100%;
    }

    nav a {
        padding: 14px var(--spacing-4);
        width: 100%;
    }

    .dropdown-menu {
        position: static;
        box-shadow: none;
        border: none;
        padding: 0;
        max-height: 0;
    }

    .dropdown.active .dropdown-menu {
        max-height: 500px;
    }

    .header-container {
        grid-template-columns: auto auto;
        justify-content: space-between;
    }

    .nav-actions {
        display: none;
    }

    .mobile-menu-toggle {
        display: inline-flex;
    }
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 18px;
    border-radius: var(--radius-full);
    border: 1px solid transparent;
    font-weight: 700;
    letter-spacing: 0.05em;
    cursor: pointer;
    transition: all 0.2s ease;
    text-decoration: none;
    font-size: 0.95rem;
}

.btn-primary {
    background: var(--color-accent);
    color: #ffffff;
    border-color: var(--color-accent);
}

.btn-primary:hover {
    box-shadow: var(--shadow-soft);
    transform: translateY(-1px);
}

.btn-secondary {
    background: var(--color-panel);
    border-color: var(--color-line);
    color: var(--color-ink);
}

.btn-secondary:hover {
    border-color: var(--color-accent);
    color: var(--color-accent);
}

.btn-ghost {
    background: transparent;
    color: var(--color-ink);
    border-color: transparent;
}

.btn-ghost:hover {
    color: var(--color-accent);
}

.pill {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 12px;
    border-radius: var(--radius-full);
    background: var(--color-panel-soft);
    color: var(--color-ink);
    font-weight: 600;
    letter-spacing: 0.03em;
}

.pill.accent {
    background: var(--color-accent-soft);
    color: var(--color-accent);
}

/* Cards & Surfaces */
.card {
    background: var(--color-panel);
    border: 1px solid var(--color-line);
    border-radius: var(--radius-lg);
    padding: var(--spacing-4);
    box-shadow: var(--shadow-card);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

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

.card-title {
    font-size: 1.15rem;
    font-weight: 700;
    margin-bottom: var(--spacing-2);
}

.card-meta {
    font-size: 0.9rem;
    color: var(--color-muted);
}

.panel {
    background: var(--color-panel);
    border: 1px solid var(--color-line);
    border-radius: var(--radius-lg);
    padding: var(--spacing-5);
    box-shadow: var(--shadow-soft);
}

.panel-soft {
    background: var(--color-panel-soft);
    border: 1px solid var(--color-line);
    border-radius: var(--radius-lg);
    padding: var(--spacing-5);
}

.divider {
    height: 1px;
    background: var(--color-line);
    margin: var(--spacing-4) 0;
}

.eyebrow {
    font-size: 0.9rem;
    color: var(--color-muted);
    letter-spacing: 0.14em;
    text-transform: uppercase;
}

.tag-row {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    margin-bottom: var(--spacing-3);
}

/* Hero */
.hero {
    background: var(--color-panel);
    padding: calc(var(--header-height) + var(--spacing-6)) 0 var(--spacing-6);
    border-bottom: 1px solid var(--color-line);
}

.hero-grid {
    display: grid;
    grid-template-columns: 1.05fr 0.95fr;
    gap: var(--spacing-6);
    align-items: center;
}

.hero h1 {
    font-size: 2.6rem;
    letter-spacing: 0.02em;
    margin-bottom: var(--spacing-3);
}

.hero p {
    color: var(--color-muted);
    margin-bottom: var(--spacing-4);
    font-size: 1.05rem;
}

.hero-visual {
    background: var(--color-panel-soft);
    border: 1px solid var(--color-line);
    border-radius: 22px;
    padding: var(--spacing-3);
    box-shadow: var(--shadow-soft);
}

.hero-visual img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 16px;
}

.hero-meta {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-3);
    margin-top: var(--spacing-4);
}

.stat-tile {
    background: var(--color-panel-soft);
    border: 1px solid var(--color-line);
    border-radius: var(--radius-md);
    padding: var(--spacing-3);
    min-width: 180px;
}

.stat-value {
    font-size: 1.6rem;
    font-weight: 700;
}

.stat-label {
    color: var(--color-muted);
    font-size: 0.95rem;
}

/* Process */
.process-flow {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: var(--spacing-3);
    position: relative;
}

.process-step {
    position: relative;
    padding: var(--spacing-4);
    border-radius: var(--radius-lg);
    background: var(--color-panel);
    border: 1px solid var(--color-line);
    box-shadow: var(--shadow-card);
}

.process-step::before {
    content: attr(data-step);
    position: absolute;
    top: 14px;
    left: 14px;
    font-size: 0.95rem;
    color: var(--color-muted);
    letter-spacing: 0.12em;
}

.process-step h3 {
    margin-top: var(--spacing-2);
    margin-bottom: var(--spacing-2);
}

.process-meta {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    color: var(--color-muted);
    font-size: 0.92rem;
}

/* Capability & Product */
.capability-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: var(--spacing-4);
}

.capability-card {
    padding: var(--spacing-4);
    border: 1px solid var(--color-line);
    border-radius: var(--radius-lg);
    background: linear-gradient(145deg, #ffffff 0%, #f8f8f8 100%);
    box-shadow: var(--shadow-card);
}

.capability-card h3 {
    margin-bottom: var(--spacing-2);
}

.list-check {
    list-style: none;
    display: grid;
    gap: 10px;
    margin-top: var(--spacing-2);
}

.list-check li {
    display: flex;
    gap: 8px;
    align-items: flex-start;
    color: var(--color-muted);
}

.list-check li::before {
    content: "•";
    color: var(--color-accent);
    font-weight: 700;
}

.product-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: var(--spacing-4);
}

.product-card {
    border: 1px solid var(--color-line);
    border-radius: var(--radius-lg);
    overflow: hidden;
    background: var(--color-panel);
    box-shadow: var(--shadow-card);
    display: flex;
    flex-direction: column;
}

.product-card img {
    border-radius: 0;
    height: 200px;
    object-fit: cover;
}

.product-card .card-body {
    padding: var(--spacing-4);
}

.product-card h4 {
    margin-bottom: var(--spacing-1);
}

/* Tables */
table {
    width: 100%;
    border-collapse: collapse;
    margin-top: var(--spacing-3);
}

th, td {
    padding: 14px 12px;
    text-align: left;
    border-bottom: 1px solid var(--color-line);
}

th {
    background: var(--color-panel-soft);
    font-weight: 700;
    letter-spacing: 0.03em;
}

tr:hover td {
    background: #fafafa;
}

/* Lists */
ul {
    padding-left: 18px;
}

ul li {
    margin-bottom: 8px;
}

.inline-list {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    list-style: none;
    padding: 0;
}

.inline-list li {
    margin: 0;
}

/* Feature blocks */
.lean-block {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-5);
    align-items: center;
}

.lean-block.reverse {
    direction: rtl;
}

.lean-block.reverse > * {
    direction: ltr;
}

.kpi-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: var(--spacing-3);
}

.kpi {
    padding: var(--spacing-3);
    border-radius: var(--radius-md);
    border: 1px solid var(--color-line);
    background: var(--color-panel);
}

.kpi strong {
    font-size: 1.3rem;
}

.note {
    color: var(--color-muted);
    font-size: 0.95rem;
}

.highlight {
    color: var(--color-accent);
    font-weight: 700;
}

.mono {
    font-family: var(--font-family-mono);
    letter-spacing: 0.08em;
}

.text-center {
    text-align: center;
}

.text-right {
    text-align: right;
}

.mt-1 { margin-top: var(--spacing-2); }
.mt-2 { margin-top: var(--spacing-3); }
.mt-3 { margin-top: var(--spacing-4); }
.mt-4 { margin-top: var(--spacing-5); }
.mb-1 { margin-bottom: var(--spacing-2); }
.mb-2 { margin-bottom: var(--spacing-3); }
.mb-3 { margin-bottom: var(--spacing-4); }
.mb-4 { margin-bottom: var(--spacing-5); }

.img-rounded {
    border-radius: var(--radius-md);
}

.img-shadow {
    box-shadow: var(--shadow-card);
}

.light {
    background: var(--color-panel);
}

.light-gray {
    background: var(--color-panel-soft);
}

.dark {
    background: #0c0f16;
    color: #e5e7eb;
}

/* News */
.news-list {
    border: 1px solid var(--color-line);
    border-radius: var(--radius-lg);
    overflow: hidden;
    background: var(--color-panel);
}

.news-item {
    padding: var(--spacing-4);
    border-bottom: 1px solid var(--color-line);
}

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

.news-meta {
    color: var(--color-muted);
    margin-bottom: 6px;
    font-size: 0.95rem;
}

.news-item h3 {
    margin-bottom: 6px;
}

/* Contact & Forms */
form {
    display: grid;
    gap: var(--spacing-3);
}

label {
    font-weight: 600;
    letter-spacing: 0.02em;
}

input, textarea, select {
    width: 100%;
    padding: 12px 14px;
    border-radius: var(--radius-md);
    border: 1px solid var(--color-line);
    background: #fff;
    font-family: var(--font-family-primary);
    font-size: 1rem;
}

input:focus, textarea:focus, select:focus {
    outline: none;
    border-color: var(--color-accent);
    box-shadow: 0 0 0 3px rgba(193, 18, 31, 0.12);
}

textarea {
    min-height: 160px;
    resize: vertical;
}

/* Footer */
footer {
    background: #0c0f16;
    color: #e5e7eb;
    padding: var(--spacing-6) 0;
    margin-top: var(--spacing-7);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-5);
}

.footer-section h4 {
    margin-bottom: var(--spacing-2);
    letter-spacing: 0.04em;
}

.footer-section ul {
    list-style: none;
    padding: 0;
}

.footer-section li {
    margin-bottom: 10px;
    color: #cbd5e1;
}

.footer-section a {
    color: #e5e7eb;
}

.footer-section a:hover {
    color: var(--color-accent);
}

.footer-bottom {
    margin-top: var(--spacing-4);
    border-top: 1px solid rgba(255,255,255,0.1);
    padding-top: var(--spacing-3);
    font-size: 0.95rem;
    color: #9ca3af;
}

.footer-bottom a {
    color: #e5e7eb;
}

.footer-bottom a:hover {
    color: var(--color-accent);
}

@media (max-width: 900px) {
    .hero-grid {
        grid-template-columns: 1fr;
    }
    .lean-block {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    section {
        padding: var(--spacing-6) 0;
    }
    .hero {
        padding: calc(var(--header-height) + var(--spacing-5)) 0 var(--spacing-5);
    }
    .hero h1 {
        font-size: 2.1rem;
    }
    .footer-content {
        grid-template-columns: 1fr;
    }
}