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

:root {
    --primary: #1a56db;
    --primary-dark: #1e40af;
    --primary-light: #dbeafe;
    --accent: #e02424;
    --accent-hover: #c81e1e;
    --text: #1f2937;
    --text-secondary: #4b5563;
    --text-muted: #6b7280;
    --bg: #ffffff;
    --bg-alt: #f3f4f6;
    --bg-card: #ffffff;
    --border: #e5e7eb;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.1), 0 1px 2px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.07), 0 2px 4px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1), 0 4px 6px rgba(0, 0, 0, 0.05);
    --radius: 8px;
    --radius-lg: 12px;
    --max-width: 1200px;
    --header-height: 64px;
    --transition: 0.2s ease;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
    color: var(--text);
    background: var(--bg);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    min-width: 320px;
}

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 20px;
}

a {
    color: var(--primary);
    text-decoration: none;
    transition: color var(--transition);
}

a:hover {
    color: var(--primary-dark);
}

img {
    max-width: 100%;
    height: auto;
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: var(--bg);
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow-sm);
    height: var(--header-height);
}

.header-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 20px;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.brand-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--primary);
    text-decoration: none;
    transition: opacity var(--transition);
}

.brand-logo:hover {
    opacity: 0.85;
    color: var(--primary);
}

.brand-icon {
    font-size: 1.5rem;
    line-height: 1;
}

.brand-name {
    letter-spacing: 0.5px;
}

.header-nav {
    display: flex;
    align-items: center;
    gap: 16px;
}

.nav-kefu {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 18px;
    background: var(--primary);
    color: #fff;
    border-radius: var(--radius);
    font-size: 0.9rem;
    font-weight: 500;
    transition: background var(--transition), transform var(--transition);
    white-space: nowrap;
}

.nav-kefu:hover {
    background: var(--primary-dark);
    color: #fff;
    transform: translateY(-1px);
}

.kefu-icon {
    font-size: 1.1rem;
    line-height: 1;
}

.hero-banner {
    background: linear-gradient(135deg, #1e3a5f 0%, #1a56db 50%, #1e40af 100%);
    color: #fff;
    padding: 60px 0;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero-banner::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: 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='0.03'%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");
    pointer-events: none;
}

.hero-banner .container {
    position: relative;
    z-index: 1;
}

.hero-title {
    font-size: 2.25rem;
    font-weight: 800;
    margin-bottom: 12px;
    letter-spacing: 1px;
}

.hero-subtitle {
    font-size: 1.15rem;
    margin-bottom: 16px;
    opacity: 0.95;
    font-weight: 400;
}

.hero-desc {
    font-size: 0.95rem;
    max-width: 700px;
    margin: 0 auto 24px;
    opacity: 0.85;
    line-height: 1.8;
}

.hero-features {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 16px 28px;
}

.hero-feat {
    font-size: 0.95rem;
    opacity: 0.9;
    font-weight: 500;
}

.query-section {
    padding: 48px 0;
    background: var(--bg-alt);
}

.query-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 28px;
    align-items: stretch;
}

.query-card {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border);
    display: flex;
    flex-direction: column;
}

.card-header {
    padding: 24px 28px 12px;
    flex-shrink: 0;
}

.card-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary);
    position: relative;
    padding-bottom: 12px;
}

.card-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 50px;
    height: 3px;
    background: var(--primary);
    border-radius: 2px;
}

.card-desc {
    margin-top: 10px;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.card-body {
    padding: 8px 28px 28px;
    flex: 1;
}

.query-form .form-group {
    margin-bottom: 20px;
}

.form-label {
    display: block;
    font-weight: 600;
    margin-bottom: 8px;
    font-size: 0.95rem;
    color: var(--text);
}

.form-select {
    width: 100%;
    padding: 12px 40px 12px 16px;
    border: 2px solid var(--border);
    border-radius: var(--radius);
    font-size: 1rem;
    color: var(--text);
    background-color: var(--bg);
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%236b7280' d='M6 8.825L1.175 4 2.238 2.938 6 6.7 9.763 2.937 10.825 4z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 14px center;
    cursor: pointer;
    transition: border-color var(--transition), box-shadow var(--transition);
    -webkit-appearance: none;
    appearance: none;
}

.form-select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(26, 86, 219, 0.15);
}

.form-select:invalid,
.form-select option[value=""] {
    color: var(--text-muted);
}

.form-error {
    display: none;
    font-size: 0.82rem;
    color: var(--accent);
    margin-top: 6px;
}

.form-error.visible {
    display: block;
}

.btn-submit {
    width: 100%;
    padding: 14px 24px;
    background: var(--accent);
    color: #fff;
    border: none;
    border-radius: var(--radius);
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
    position: relative;
    overflow: hidden;
    letter-spacing: 1px;
    -webkit-appearance: none;
    appearance: none;
}

.btn-submit:hover {
    background: var(--accent-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-submit:active {
    transform: translateY(0);
}

.btn-submit:disabled {
    background: #9ca3af;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

.btn-submit .btn-loading {
    display: none;
}

.btn-submit.loading .btn-text {
    display: none;
}

.btn-submit.loading .btn-loading {
    display: inline;
}

.btn-submit.loading {
    pointer-events: none;
}

.countdown-overlay {
    display: none;
    padding: 28px 0 8px;
    text-align: center;
}

.countdown-overlay.active {
    display: block;
}

.countdown-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
}

.countdown-circle {
    position: relative;
    width: 100px;
    height: 100px;
}

.countdown-svg {
    width: 100%;
    height: 100%;
    transform: rotate(-90deg);
    display: block;
}

.countdown-bg {
    fill: none;
    stroke: var(--border);
    stroke-width: 6;
}

.countdown-progress {
    fill: none;
    stroke: var(--primary);
    stroke-width: 6;
    stroke-linecap: round;
    stroke-dasharray: 282.743;
    stroke-dashoffset: 0;
    transition: stroke-dashoffset 1s linear, stroke 0.3s ease;
}

.countdown-number {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) translateZ(0);
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--primary);
    transition: color 0.3s ease;
    will-change: transform, color;
}

.countdown-number.urgent {
    color: var(--accent);
    animation: pulse 0.5s ease-in-out;
}

@keyframes pulse {
    0%, 100% {
        transform: translate(-50%, -50%) translateZ(0) scale(1);
    }
    50% {
        transform: translate(-50%, -50%) translateZ(0) scale(1.15);
    }
}

.countdown-text {
    font-size: 0.95rem;
    color: var(--text-secondary);
}

.tips-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 18px;
    padding: 0;
}

.tips-item {
    display: flex;
    gap: 14px;
    align-items: flex-start;
}

.tips-icon {
    flex-shrink: 0;
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--primary-light);
    border-radius: 50%;
    font-size: 1rem;
    color: var(--primary);
    line-height: 1;
}

.tips-text {
    flex: 1;
    min-width: 0;
    font-size: 0.93rem;
    color: var(--text-secondary);
    line-height: 1.7;
}

.content-section {
    padding: 60px 0;
}

.content-section.alt-bg {
    background: var(--bg-alt);
}

.section-title {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--text);
    text-align: center;
    margin-bottom: 40px;
    position: relative;
    padding-bottom: 16px;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 3px;
    background: var(--primary);
    border-radius: 2px;
}

.content-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.content-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 28px;
    transition: box-shadow var(--transition), transform var(--transition);
}

.content-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.content-card-title {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 12px;
}

.content-card p {
    font-size: 0.93rem;
    color: var(--text-secondary);
    line-height: 1.8;
}

.exam-info-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.exam-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 28px;
    text-align: center;
    transition: box-shadow var(--transition), transform var(--transition);
}

.exam-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.exam-card-num {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--primary);
    opacity: 0.3;
    margin-bottom: 8px;
    line-height: 1;
}

.exam-card-title {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--text);
}

.exam-card p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.8;
}

.tips-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.tip-item {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 24px;
    border-left: 4px solid var(--primary);
    transition: box-shadow var(--transition), transform var(--transition);
}

.tip-item:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-1px);
}

.tip-title {
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 10px;
}

.tip-item p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.8;
}

.cases-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.case-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 32px 24px;
    text-align: center;
    transition: box-shadow var(--transition), transform var(--transition);
}

.case-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.case-avatar {
    font-size: 3rem;
    margin-bottom: 12px;
    line-height: 1;
}

.case-name {
    font-size: 1.05rem;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--text);
}

.case-desc {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.8;
    font-style: italic;
}

.disclaimer {
    text-align: center;
    margin-top: 24px;
    color: var(--text-muted);
}

.faq-list {
    max-width: 800px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.faq-item {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
    transition: box-shadow var(--transition);
}

.faq-item:hover {
    box-shadow: var(--shadow-sm);
}

.faq-question {
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--text);
    padding: 18px 24px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: space-between;
    user-select: none;
    transition: color var(--transition);
}

.faq-question::after {
    content: '+';
    font-size: 1.5rem;
    font-weight: 300;
    color: var(--primary);
    transition: transform var(--transition);
    flex-shrink: 0;
    margin-left: 12px;
    line-height: 1;
}

.faq-item.open .faq-question::after {
    content: '\2212';
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.35s ease, padding 0.35s ease;
}

.faq-item.open .faq-answer {
    max-height: 300px;
    padding: 0 24px 20px;
}

.faq-answer p {
    font-size: 0.93rem;
    color: var(--text-secondary);
    line-height: 1.8;
}

.cta-section {
    background: linear-gradient(135deg, #1a56db, #1e40af);
    color: #fff;
    padding: 56px 0;
    text-align: center;
}

.cta-title {
    font-size: 1.7rem;
    font-weight: 700;
    margin-bottom: 12px;
}

.cta-desc {
    font-size: 1.05rem;
    opacity: 0.9;
    margin-bottom: 28px;
}

.btn-cta {
    display: inline-block;
    padding: 14px 40px;
    background: #fff;
    color: var(--primary);
    border-radius: var(--radius);
    font-size: 1.1rem;
    font-weight: 700;
    transition: transform var(--transition), box-shadow var(--transition);
    letter-spacing: 1px;
}

.btn-cta:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.2);
    color: var(--primary-dark);
}

.site-footer {
    background: #111827;
    color: #d1d5db;
    padding: 48px 0 24px;
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 36px;
    margin-bottom: 36px;
}

.footer-title {
    font-size: 1.1rem;
    font-weight: 700;
    color: #fff;
    margin-bottom: 16px;
}

.footer-text {
    font-size: 0.88rem;
    line-height: 1.8;
    color: #9ca3af;
}

.footer-links {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 10px;
    font-size: 0.88rem;
    padding: 0;
}

.footer-links a {
    color: #d1d5db;
}

.footer-links a:hover {
    color: #fff;
}

.footer-bottom {
    border-top: 1px solid #374151;
    padding-top: 20px;
    text-align: center;
}

.footer-copyright {
    font-size: 0.85rem;
    color: #6b7280;
}

@media (max-width: 900px) {
    .hero-title {
        font-size: 1.7rem;
    }

    .hero-features {
        gap: 10px 18px;
    }

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

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

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

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

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

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

@media (max-width: 600px) {
    .hero-banner {
        padding: 40px 0;
    }

    .hero-title {
        font-size: 1.4rem;
    }

    .hero-subtitle {
        font-size: 1rem;
    }

    .hero-feat {
        font-size: 0.85rem;
    }

    .section-title {
        font-size: 1.4rem;
    }

    .query-section {
        padding: 32px 0;
    }

    .content-section {
        padding: 40px 0;
    }

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

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

    .card-header {
        padding: 20px 18px 10px;
    }

    .card-body {
        padding: 4px 18px 20px;
    }

    .header-container {
        padding: 0 12px;
    }

    .nav-kefu {
        padding: 6px 12px;
        font-size: 0.82rem;
    }
}