/* ===== 基础重置与全局样式 ===== */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary: #4A6FA5;
    --primary-light: #6B8FC5;
    --primary-dark: #3A5A8A;
    --accent: #E8864A;
    --accent-light: #F0A06A;
    --bg: #F5F7FA;
    --bg-warm: #FAFBFC;
    --white: #FFFFFF;
    --gray-50: #F8F9FA;
    --gray-100: #F1F3F5;
    --gray-200: #E9ECEF;
    --gray-300: #DEE2E6;
    --gray-400: #ADB5BD;
    --gray-500: #868E96;
    --gray-600: #6C757D;
    --gray-700: #495057;
    --gray-800: #343A40;
    --gray-900: #212529;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.12);
    --shadow-hover: 0 8px 25px rgba(74, 111, 165, 0.15);
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --transition: all 0.25s ease;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
        "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica,
        Arial, sans-serif;
    background-color: var(--bg);
    color: var(--gray-800);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    -webkit-font-smoothing: antialiased;
}

/* ===== 顶部导航 ===== */
.header {
    background: var(--white);
    border-bottom: 1px solid var(--gray-200);
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow-sm);
}

.header-inner {
    max-width: 960px;
    margin: 0 auto;
    padding: 16px 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo-area {
    display: flex;
    align-items: center;
    gap: 14px;
}

.logo-icon {
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    color: var(--white);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    font-weight: 700;
    letter-spacing: 1px;
    flex-shrink: 0;
}

.logo-img {
    height: 44px;
    width: auto;
    flex-shrink: 0;
    object-fit: contain;
}

.logo-text h1 {
    font-size: 20px;
    font-weight: 600;
    color: var(--gray-900);
    line-height: 1.3;
}

.logo-text .subtitle {
    font-size: 13px;
    color: var(--gray-500);
    line-height: 1.3;
}

/* ===== 主内容 ===== */
.main {
    flex: 1;
    max-width: 960px;
    width: 100%;
    margin: 0 auto;
    padding: 0 24px;
}

.section {
    padding: 32px 0;
}

.section-title {
    font-size: 18px;
    font-weight: 600;
    color: var(--gray-800);
    margin-bottom: 20px;
    position: relative;
    padding-left: 14px;
}

.section-title::before {
    content: '';
    position: absolute;
    left: 0;
    top: 4px;
    bottom: 4px;
    width: 4px;
    background: var(--primary);
    border-radius: 2px;
}

/* ===== 型号选择卡片 ===== */
.model-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
    gap: 16px;
}

.model-card {
    background: var(--white);
    border: 2px solid var(--gray-200);
    border-radius: var(--radius-md);
    padding: 24px 16px;
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
    font-family: inherit;
}

.model-card:hover {
    border-color: var(--primary-light);
    box-shadow: var(--shadow-hover);
    transform: translateY(-2px);
}

.model-card.active {
    border-color: var(--primary);
    background: linear-gradient(180deg, rgba(74, 111, 165, 0.04) 0%, var(--white) 100%);
    box-shadow: var(--shadow-hover);
}

.model-card .model-icon {
    width: 52px;
    height: 52px;
    border-radius: var(--radius-sm);
    background: var(--gray-100);
    color: var(--primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    font-weight: 700;
    transition: var(--transition);
}

.model-card.active .model-icon,
.model-card:hover .model-icon {
    background: var(--primary);
    color: var(--white);
}

.model-card .model-name {
    font-size: 15px;
    font-weight: 600;
    color: var(--gray-800);
}

.model-card .model-desc {
    font-size: 12px;
    color: var(--gray-500);
}

/* ===== 搜索区域 ===== */
.search-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 16px;
}

.search-header .section-title {
    margin-bottom: 0;
}

.btn-back {
    background: none;
    border: 1px solid var(--gray-300);
    border-radius: var(--radius-sm);
    padding: 8px 16px;
    font-size: 14px;
    color: var(--gray-600);
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 4px;
    font-family: inherit;
}

.btn-back:hover {
    background: var(--gray-100);
    color: var(--gray-800);
}

.back-arrow {
    font-size: 16px;
}

.search-box {
    position: relative;
    display: flex;
    align-items: center;
}

.search-icon {
    position: absolute;
    left: 16px;
    color: var(--gray-400);
    pointer-events: none;
}

.search-box input {
    width: 100%;
    padding: 14px 44px 14px 48px;
    border: 2px solid var(--gray-200);
    border-radius: var(--radius-md);
    font-size: 15px;
    color: var(--gray-800);
    background: var(--white);
    transition: var(--transition);
    outline: none;
    font-family: inherit;
}

.search-box input::placeholder {
    color: var(--gray-400);
}

.search-box input:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(74, 111, 165, 0.12);
}

.btn-clear {
    position: absolute;
    right: 12px;
    background: none;
    border: none;
    color: var(--gray-400);
    cursor: pointer;
    padding: 4px 8px;
    font-size: 16px;
    transition: var(--transition);
    display: none;
    font-family: inherit;
}

.btn-clear.visible {
    display: block;
}

.btn-clear:hover {
    color: var(--gray-700);
}

.search-stats {
    margin-top: 12px;
    font-size: 13px;
    color: var(--gray-500);
}

/* ===== 报警列表 ===== */
.alarm-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.alarm-item {
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-md);
    padding: 16px 20px;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: flex-start;
    gap: 16px;
}

.alarm-item:hover {
    border-color: var(--primary-light);
    box-shadow: var(--shadow-md);
    transform: translateY(-1px);
}

.alarm-code {
    flex-shrink: 0;
    background: var(--primary);
    color: var(--white);
    padding: 6px 14px;
    border-radius: 6px;
    font-size: 14px;
    font-weight: 600;
    letter-spacing: 0.5px;
    white-space: nowrap;
    font-family: "SF Mono", "Cascadia Code", "Consolas", monospace;
}

.alarm-info {
    flex: 1;
    min-width: 0;
}

.alarm-name {
    font-size: 15px;
    font-weight: 600;
    color: var(--gray-800);
    margin-bottom: 4px;
}

.alarm-desc {
    font-size: 13px;
    color: var(--gray-500);
    line-height: 1.5;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.alarm-arrow {
    flex-shrink: 0;
    color: var(--gray-400);
    font-size: 18px;
    align-self: center;
    transition: var(--transition);
}

.alarm-item:hover .alarm-arrow {
    color: var(--primary);
    transform: translateX(3px);
}

/* ===== 空状态 ===== */
.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--gray-500);
}

.empty-icon {
    font-size: 48px;
    margin-bottom: 16px;
    opacity: 0.6;
}

.empty-state p {
    font-size: 16px;
    margin-bottom: 4px;
}

.empty-hint {
    font-size: 13px;
    color: var(--gray-400);
}

/* ===== 弹窗 ===== */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.4);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    z-index: 200;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
}

.modal-overlay.visible {
    opacity: 1;
    visibility: visible;
}

.modal {
    background: var(--white);
    border-radius: var(--radius-lg);
    width: 100%;
    max-width: 560px;
    max-height: 80vh;
    overflow-y: auto;
    box-shadow: var(--shadow-lg);
    transform: translateY(20px) scale(0.97);
    transition: var(--transition);
}

.modal-overlay.visible .modal {
    transform: translateY(0) scale(1);
}

.modal-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    padding: 24px 24px 0 24px;
}

.modal-title {
    font-size: 18px;
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: 4px;
}

.modal-code {
    display: inline-block;
    background: var(--primary);
    color: var(--white);
    padding: 3px 10px;
    border-radius: 4px;
    font-size: 13px;
    font-weight: 600;
    font-family: "SF Mono", "Cascadia Code", "Consolas", monospace;
}

.modal-close {
    background: none;
    border: none;
    font-size: 20px;
    color: var(--gray-500);
    cursor: pointer;
    padding: 4px 8px;
    border-radius: 6px;
    transition: var(--transition);
    flex-shrink: 0;
    font-family: inherit;
}

.modal-close:hover {
    background: var(--gray-100);
    color: var(--gray-800);
}

.modal-body {
    padding: 24px;
}

.modal-section {
    margin-bottom: 24px;
}

.modal-section:last-child {
    margin-bottom: 0;
}

.modal-section h4 {
    font-size: 15px;
    font-weight: 600;
    color: var(--gray-700);
    margin-bottom: 12px;
    padding-bottom: 8px;
    border-bottom: 1px solid var(--gray-100);
}

.modal-section p {
    font-size: 14px;
    color: var(--gray-600);
    line-height: 1.7;
}

.modal-section ol {
    padding-left: 20px;
    list-style: decimal;
}

.modal-section ol li {
    font-size: 14px;
    color: var(--gray-600);
    line-height: 1.8;
    padding-left: 4px;
}

.modal-section ol li::marker {
    color: var(--primary);
    font-weight: 600;
}

/* ===== 底部 ===== */
.footer {
    background: var(--white);
    border-top: 1px solid var(--gray-200);
    text-align: center;
    padding: 20px 24px;
    margin-top: auto;
}

.footer p {
    font-size: 13px;
    color: var(--gray-500);
}

/* ===== 加载动画 ===== */
.loading {
    text-align: center;
    padding: 40px;
    color: var(--gray-500);
    font-size: 14px;
}

.loading::after {
    content: '';
    animation: dots 1.5s steps(4, end) infinite;
}

@keyframes dots {
    0%   { content: ''; }
    25%  { content: '.'; }
    50%  { content: '..'; }
    75%  { content: '...'; }
}

/* ===== 入场动画 ===== */
.model-card {
    opacity: 0;
    transform: translateY(12px);
    animation: fadeInUp 0.4s ease forwards;
}

.model-card:nth-child(1) { animation-delay: 0.05s; }
.model-card:nth-child(2) { animation-delay: 0.10s; }
.model-card:nth-child(3) { animation-delay: 0.15s; }
.model-card:nth-child(4) { animation-delay: 0.20s; }
.model-card:nth-child(5) { animation-delay: 0.25s; }

@keyframes fadeInUp {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.alarm-item {
    opacity: 0;
    transform: translateY(8px);
    animation: fadeInUp 0.3s ease forwards;
}

/* ===== 高亮搜索匹配 ===== */
.highlight {
    background: rgba(232, 134, 74, 0.15);
    color: var(--accent);
    padding: 1px 3px;
    border-radius: 3px;
    font-weight: 600;
}

/* ===== 响应式 ===== */
@media (max-width: 640px) {
    .header-inner {
        padding: 12px 16px;
    }

    .logo-icon {
        width: 40px;
        height: 40px;
        font-size: 16px;
    }

    .logo-text h1 {
        font-size: 17px;
    }

    .logo-text .subtitle {
        font-size: 12px;
    }

    .main {
        padding: 0 16px;
    }

    .section {
        padding: 24px 0;
    }

    .model-grid {
        grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
        gap: 12px;
    }

    .model-card {
        padding: 18px 12px;
    }

    .model-card .model-icon {
        width: 44px;
        height: 44px;
        font-size: 15px;
    }

    .alarm-item {
        padding: 14px 16px;
        gap: 12px;
    }

    .alarm-code {
        padding: 5px 10px;
        font-size: 13px;
    }

    .modal {
        max-height: 90vh;
    }

    .modal-header {
        padding: 20px 20px 0 20px;
    }

    .modal-body {
        padding: 20px;
    }
}

/* ===== 滚动条美化 ===== */
::-webkit-scrollbar {
    width: 6px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: var(--gray-300);
    border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--gray-400);
}