/**
 * base.css — CSS reset, custom properties (design tokens), typography, layout utilities
 * 
 * Defines the design system: color palette, spacing scale, glass-morphism
 * shadows, noise texture, fonts (Noto Serif SC / JetBrains Mono).
 * Dark and light themes driven by CSS variables with [data-theme].
 */
/* Extracted from style.css */

/**
 * 密钥博客 - 暗色极简密码学风格
 * Author: Lighter (zhenith)
 * Theme: 深邃的黑夜 · 加密的艺术
 */
/* ==================== 变量定义 ==================== */
:root {
    /* 色彩系统 */
    --bg-primary: #0a0a0f;
    --bg-secondary: #0f0f18;
    --bg-tertiary: #14141f;
    --bg-card: #1a1a28;
    --bg-hover: #22223a;
    --bg-primary-rgb: 10, 10, 15;
    
    /* 强调色 */
    --accent-primary: #00ff88;
    --accent-secondary: #7b8cde;
    --accent-tertiary: #bd93f9;
    --accent-warning: #ffb86c;
    --accent-error: #ff5555;
    --accent-success: #50fa7b;

    /* 强调色 RGB（用于 rgba() 组合） */
    --accent-primary-rgb: 0, 255, 136;
    --accent-secondary-rgb: 123, 140, 222;
    --accent-tertiary-rgb: 189, 147, 249;
    --accent-warning-rgb: 255, 184, 108;
    --accent-error-rgb: 255, 85, 85;
    --accent-success-rgb: 80, 250, 123;
    
    /* 文字色 */
    --text-primary: #e8e8f0;
    --text-secondary: #a0a0b8;
    --text-muted: #606080;
    --text-dim: #404060;
    
    /* 边框 */
    --border-subtle: rgba(var(--accent-primary-rgb), 0.08);
    --border-accent: rgba(var(--accent-primary-rgb), 0.2);

    /* 阴影 */
    --shadow-glow: 0 0 30px rgba(var(--accent-primary-rgb), 0.1);
    --shadow-card: 0 4px 20px rgba(0, 0, 0, 0.4);
    --shadow-hover: 0 8px 30px rgba(0, 0, 0, 0.5);
    
    /* 字体 */
    /* 无衬线：系统原生字体栈 — 零延迟，全平台原生渲染 */
    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue", Arial, "Noto Sans SC", sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji";
    /* 衬线：Noto Serif SC 优先 — CJK 正文 + 等高拉丁数字，无 Georgia（旧风格数字） */
    --font-serif: 'Noto Serif SC', 'Source Han Serif CN', 'Times New Roman', 'Noto Serif', serif;
    /* 等宽：系统原生等宽栈 — 零延迟，macOS(SF Mono) / Windows(Consolas) 原生渲染 */
    --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
    
    /* 动画 */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}
/* ==================== 浅色主题 ==================== */
:root[data-theme="light"] {
    --bg-primary: #fafafa;
    --bg-secondary: #f5f5f5;
    --bg-tertiary: #eeeeee;
    --bg-primary-rgb: 250, 250, 250;
    --bg-card: #ffffff;
    --bg-hover: #f0f0f0;
    
    --accent-primary: #0a7d4f;
    --accent-secondary: #4a5a9e;
    --accent-tertiary: #7c3aed;
    --accent-warning: #c47a20;
    --accent-error: #cc3333;
    --accent-success: #2d9e50;

    --accent-primary-rgb: 10, 125, 79;
    --accent-secondary-rgb: 74, 90, 158;
    --accent-tertiary-rgb: 124, 58, 237;
    --accent-warning-rgb: 196, 122, 32;
    --accent-error-rgb: 204, 51, 51;
    --accent-success-rgb: 45, 158, 80;
    
    --text-primary: #1a1a2e;
    --text-secondary: #4a4a68;
    --text-muted: #8888a0;
    --text-dim: #aaaac0;
    
    --border-subtle: rgba(var(--accent-primary-rgb), 0.12);
    --border-accent: rgba(var(--accent-primary-rgb), 0.25);

    --shadow-glow: 0 0 30px rgba(var(--accent-primary-rgb), 0.08);
    --shadow-card: 0 4px 20px rgba(0, 0, 0, 0.08);
    --shadow-hover: 0 8px 30px rgba(0, 0, 0, 0.1);
}

/* 浅色主题下的二进制背景 */
:root[data-theme="light"] .binary-bg {
    opacity: 0.5;
}

/* 浅色主题下的凯撒轮 */
:root[data-theme="light"] .caesar-wheel {
    opacity: 0.55;
}
:root[data-theme="light"] .caesar-wheel svg circle {
    stroke: rgba(var(--accent-primary-rgb), 0.2);
}
:root[data-theme="light"] .caesar-wheel svg text {
    fill: rgba(var(--accent-primary-rgb), 0.35);
}

/* 浅色主题下的代码块 */
:root[data-theme="light"] .article-content pre {
    background: #f6f8fa;
    border-color: rgba(0, 0, 0, 0.1);
}

:root[data-theme="light"] .article-content .code-block-header {
    background: rgba(0, 0, 0, 0.03);
    border-bottom-color: rgba(0, 0, 0, 0.08);
}

:root[data-theme="light"] .article-content .code-language {
    color: #666;
}

:root[data-theme="light"] .article-content .code-copy-btn {
    border-color: rgba(0, 0, 0, 0.12);
    color: #666;
}

:root[data-theme="light"] .article-content .code-copy-btn:hover {
    background: rgba(0, 0, 0, 0.05);
    color: #333;
}

:root[data-theme="light"] .article-content code:not(pre code) {
    color: #d63384;
    background: rgba(214, 51, 132, 0.08);
    border-color: rgba(214, 51, 132, 0.2);
}
:root[data-theme="light"] .article-content img {
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.1);
}

/* 浅色主题下的终端 */
:root[data-theme="light"] .terminal-header {
    background: var(--bg-tertiary);
}
:root[data-theme="light"] .entrance-content {
    background: #ffffff;
    border-color: var(--border-subtle);
}

/* 浅色主题下的文章检索页 */
:root[data-theme="light"] .search-box {
    background: #f5f5f5;
    border-color: #ddd;
    color: #333;
}

:root[data-theme="light"] .article-row:hover {
    background: #f0f0f0;
}

:root[data-theme="light"] .article-row {
    border-bottom-color: #eee;
}

:root[data-theme="light"] .article-date {
    color: #999;
}

:root[data-theme="light"] .article-title {
    color: #333;
}

:root[data-theme="light"] .no-results {
    color: #999;
}

:root[data-theme="light"] .tag-btn {
    border-color: #ddd;
    color: #666;
}

:root[data-theme="light"] .tag-btn:hover {
    border-color: #aaa;
}

:root[data-theme="light"] .exit-btn {
    background: rgba(180, 30, 30, 0.06);
    border-color: rgba(180, 30, 30, 0.15);
    color: #b03030;
}

:root[data-theme="light"] .exit-btn:hover {
    background: rgba(180, 30, 30, 0.12);
    border-color: #b03030;
}

/* 浅色主题下的文章阅读页 */
:root[data-theme="light"] .article-meta {
    color: #999;
}

:root[data-theme="light"] .article-reader::before {
    border-color: rgba(0, 0, 0, 0.06);
}

/* ==================== 主题切换按钮 ==================== */
.theme-toggle {
    background: none;
    border: 1px solid var(--border-subtle);
    border-radius: 8px;
    padding: 6px 8px;
    cursor: pointer;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
    width: 34px;
    height: 34px;
}
.theme-toggle:hover {
    border-color: var(--border-accent);
    color: var(--accent-primary);
    background: var(--bg-hover);
}
.theme-toggle svg {
    width: 16px;
    height: 16px;
}
/* 默认显示月亮（暗色主题下切换到浅色） */
.theme-toggle .icon-sun { display: none; }
.theme-toggle .icon-moon { display: block; }
:root[data-theme="light"] .theme-toggle .icon-sun { display: block; }
:root[data-theme="light"] .theme-toggle .icon-moon { display: none; }
/* ==================== 基础重置 ==================== */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
    max-width: 100vw;
    overflow-x: hidden;
    background-color: var(--bg-primary);
    -webkit-text-size-adjust: 100%;
    transition: background-color var(--transition-slow), color var(--transition-slow);
}

body {
    font-family: var(--font-mono);
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
    -webkit-text-size-adjust: 100%;
    transition: background-color var(--transition-slow), color var(--transition-slow);
}

:lang(zh) .article-content,
:lang(zh-CN) .article-content {
    text-align: justify;
    text-justify: inter-ideographic;
    word-break: break-word;
}

/* 全局过渡动画 - 所有使用CSS变量的元素自动获得过渡效果 */
*,
*::before,
*::after {
    transition-property: background-color, border-color, color, fill, stroke, box-shadow, opacity;
    transition-duration: var(--transition-normal);
    transition-timing-function: ease;
}

/* canvas 元素不需要过渡 */
canvas, canvas::before, canvas::after {
    transition: none !important;
}

/* 隐藏类 */
.hidden {
    display: none !important;
}
/* ==================== 背景装饰 ==================== */
.binary-bg {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    pointer-events: none;
    z-index: 1;
    opacity: 0.15;
}

.matrix-rain {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    pointer-events: none;
    z-index: 5;
    opacity: 0.4;
}

.caesar-wheel {
    position: fixed;
    width: 300px;
    height: 300px;
    pointer-events: none;
    z-index: 1;
    opacity: 0.4;
    animation: rotate-slow 120s linear infinite;
}

.caesar-wheel.top-left {
    top: -100px;
    left: -100px;
}

.caesar-wheel.bottom-right {
    bottom: -100px;
    right: -100px;
    animation-direction: reverse;
}

.wheel-svg {
    width: 100%;
    height: 100%;
}

.caesar-wheel svg circle {
    stroke: rgba(var(--accent-primary-rgb), 0.1);
}
.caesar-wheel svg text {
    fill: rgba(var(--accent-primary-rgb), 0.3);
}

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

@keyframes caesar-pulse {
    0%, 100% {
        filter: drop-shadow(0 0 20px rgba(var(--accent-primary-rgb), 0.1));
    }
    50% {
        filter: drop-shadow(0 0 35px rgba(var(--accent-primary-rgb), 0.2));
    }
}

.caesar-wheel:hover {
    animation: rotate-slow 180s linear infinite, caesar-pulse 2s ease-in-out infinite;
}

/* ==================== 主页导航 ==================== */
/* 全局导航栏（原 home-nav） */
.global-nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    background: rgba(var(--bg-primary-rgb), 0.55);
    backdrop-filter: blur(24px) saturate(1.2);
    -webkit-backdrop-filter: blur(24px) saturate(1.2);
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    box-shadow:
        0 1px 0 0 rgba(255, 255, 255, 0.04) inset,
        0 4px 24px rgba(0, 0, 0, 0.12);
    transition: all var(--transition-normal), transform 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}
.global-nav.hidden {
    opacity: 0;
    pointer-events: none;
    transform: translateY(-100%);
}
.global-nav.slide-up {
    transform: translateY(-100%);
}

.global-nav.scrolled {
    background: rgba(var(--bg-primary-rgb), 0.72);
    backdrop-filter: blur(28px) saturate(1.4);
    -webkit-backdrop-filter: blur(28px) saturate(1.4);
    border-bottom: 1px solid rgba(255, 255, 255, 0.12);
    box-shadow:
        0 1px 0 0 rgba(255, 255, 255, 0.06) inset,
        0 8px 32px rgba(0, 0, 0, 0.2);
}

:root[data-theme="light"] .global-nav {
    background: rgba(255, 255, 255, 0.6);
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
    box-shadow:
        0 1px 0 0 rgba(255, 255, 255, 0.8) inset,
        0 4px 20px rgba(0, 0, 0, 0.04);
}

:root[data-theme="light"] .global-nav.scrolled {
    background: rgba(255, 255, 255, 0.75);
    backdrop-filter: blur(28px) saturate(1.4);
    -webkit-backdrop-filter: blur(28px) saturate(1.4);
    border-bottom: 1px solid rgba(0, 0, 0, 0.08);
    box-shadow:
        0 1px 0 0 rgba(255, 255, 255, 0.9) inset,
        0 8px 30px rgba(0, 0, 0, 0.08);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 16px 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    color: var(--text-primary);
    padding: 4px 0;
}

.logo-symbol {
    font-size: 28px;
    color: var(--accent-primary);
    font-weight: 300;
}

.logo-badge {
    font-size: 11px;
    color: #444;
    font-weight: 400;
    margin-left: 6px;
    letter-spacing: 0.05em;
}

.logo-text {
    font-size: 16px;
    font-weight: 500;
    letter-spacing: 1px;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 32px;
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 14px;
    transition: color var(--transition-fast);
    position: relative;
}

.nav-link:hover,
.nav-link.active {
    color: var(--text-primary);
}

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--accent-primary);
    border-radius: 1px;
}

.vault-link {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 8px 16px;
    background: rgba(var(--accent-primary-rgb), 0.1);
    border: 1px solid var(--border-accent);
    border-radius: 6px;
    color: var(--accent-primary) !important;
}

.vault-link:hover {
    background: rgba(var(--accent-primary-rgb), 0.2);
}

.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
}

.mobile-menu-btn span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    transition: all var(--transition-fast);
}

.mobile-menu {
    position: fixed;
    top: 60px;
    left: 0;
    right: 0;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-subtle);
    padding: 16px;
    z-index: 99;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.mobile-nav-link {
    display: block;
    padding: 12px 16px;
    color: var(--text-primary);
    text-decoration: none;
    border-radius: 8px;
    transition: background var(--transition-fast);
}

.mobile-nav-link:hover,
.mobile-nav-link.active {
    background: var(--bg-hover);
}

.mobile-theme-toggle {
    display: flex;
    align-items: center;
    gap: 10px;
    width: 100%;
    padding: 16px 24px;
    background: none;
    border: none;
    border-top: 1px solid var(--border-subtle);
    color: var(--text-secondary);
    font-family: var(--font-mono);
    font-size: 14px;
    cursor: pointer;
    transition: all var(--transition-fast);
    margin-top: 8px;
    text-decoration: none;
    text-align: left;
}

.mobile-theme-toggle:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}

.mobile-theme-toggle .icon-sun,
.mobile-theme-toggle .icon-moon { width: 18px; height: 18px; }

:root .mobile-theme-toggle .icon-sun { display: none; }
:root .mobile-theme-toggle .icon-moon { display: block; }
:root[data-theme="light"] .mobile-theme-toggle .icon-moon { display: none; }
:root[data-theme="light"] .mobile-theme-toggle .icon-sun { display: block; }

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }
    .mobile-menu-btn {
        display: flex;
    }

    .entrance-content {
        padding: 24px 16px;
    }

    .ascii-art pre {
        font-size: clamp(6px, 2.2vw, 10px);
    }
}

/* ==================== 打字机效果 ==================== */
.typewriter-overlay {
    position: fixed;
    inset: 0;
    background: var(--bg-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10000;
}

.typewriter-text {
    font-family: var(--font-mono);
    font-size: 24px;
    color: var(--accent-primary);
    text-shadow: 0 0 20px rgba(var(--accent-primary-rgb), 0.5);
}
/* ==================== 空状态 ==================== */
.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--text-muted);
    grid-column: 1 / -1; /* 跨越所有 grid 列 */
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 60vh;
}

.empty-state-icon {
    font-size: 48px;
    margin-bottom: 16px;
    opacity: 0.5;
}

.empty-state-text {
    font-size: 14px;
}
/* ==================== 噪点纹理（暂时禁用排查） ==================== */
/*
body::before {
    content: '';
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 0;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)'/%3E%3C/svg%3E");
    background-repeat: repeat;
    background-size: 200px 200px;
    opacity: 0.02;
    mix-blend-mode: overlay;
}

:root[data-theme="light"] body::before {
    opacity: 0.015;
    mix-blend-mode: multiply;
}
*/
/* ==================== 阴影系统 ==================== */
.shadow-flat {
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.12);
}

:root[data-theme="light"] .shadow-flat {
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.04);
}

.shadow-elevated {
    box-shadow:
        0 4px 12px rgba(0, 0, 0, 0.15),
        0 1px 3px rgba(0, 0, 0, 0.1);
}

:root[data-theme="light"] .shadow-elevated {
    box-shadow:
        0 4px 16px rgba(0, 0, 0, 0.06),
        0 1px 4px rgba(0, 0, 0, 0.04);
}

.shadow-floating {
    box-shadow:
        0 12px 40px rgba(0, 0, 0, 0.2),
        0 4px 12px rgba(0, 0, 0, 0.15);
}

:root[data-theme="light"] .shadow-floating {
    box-shadow:
        0 12px 40px rgba(0, 0, 0, 0.1),
        0 4px 16px rgba(0, 0, 0, 0.06);
}

.shadow-glow {
    box-shadow:
        0 0 20px rgba(var(--accent-primary-rgb), 0.15),
        0 0 40px rgba(var(--accent-primary-rgb), 0.08);
}
/* ==================== 响应式 ==================== */
@media (max-width: 768px) {
    :root {
        --space-unit: 0.4rem;
    }

    .article-content {
        --font-size-base: 16px;
        font-size: 16px;
    }

    .hero {
        padding: 100px 16px 60px;
    }
    
    .hero-title {
        font-size: clamp(1.75rem, 6vw, 2.5rem);
    }
    
    .vault-btn-wrapper {
        width: 180px;
        height: 180px;
    }
    
    .vault-btn {
        width: 130px;
        height: 130px;
    }
    
    .vault-icon svg {
        width: 36px;
        height: 36px;
    }
    
    .vault-btn-text {
        font-size: 12px;
    }
    
    .vault-btn-subtext {
        font-size: 10px;
    }
    
    .article-reader {
        padding: 70px 16px 50px;
        max-width: 100%;
    }

    .article-reader::before {
        border-radius: 12px;
        backdrop-filter: blur(40px) saturate(110%);
        -webkit-backdrop-filter: blur(40px) saturate(110%);
    }

    .article-content h1 {
        font-size: 26px;
    }

    .article-content h2 {
        font-size: 20px;
        margin: 40px 0 16px;
    }

    .article-content h3 {
        font-size: 18px;
    }

    .article-content .code-block-wrapper {
        margin: 22px 0;
    }

    .article-content .code-block-content {
        padding: 12px;
    }

    .article-content .code-block-header {
        padding: 8px 12px;
    }

    .article-content .code-language {
        font-size: 10px;
    }

    .article-content .code-copy-btn {
        font-size: 10px;
        padding: 3px 6px;
    }

    .article-content .heading-anchor {
        font-size: 0.8em;
        left: -1.1em;
    }
    
    .back-fab,
    .toc-fab,
    .theme-fab {
        width: 44px;
        height: 44px;
        bottom: 20px;
    }
    .theme-fab {
        top: 70px;
        right: 16px;
        bottom: auto;
    }
    
    .back-fab {
        left: 20px;
    }
    
    .toc-fab {
        right: 20px;
    }

    .articles-topbar {
        flex-wrap: wrap;
        gap: 8px;
    }

    .exit-btn {
        font-size: 0.7rem;
        padding: 5px 10px;
    }

    .table-header .col-date { flex: 0 0 100px; }
    .table-header .col-tags { display: none; }
    .table-header .sort-col { padding: 8px 10px; font-size: 0.65rem; }
}

@media (max-width: 480px) {
    .article-content h1 {
        font-size: 24px;
    }

    .article-content h2 {
        font-size: 18px;
    }

    .post-navigation {
        padding: var(--space-md);
    }
}

/* ==================== 平板适配 (640px - 1024px) ==================== */
@media (min-width: 641px) and (max-width: 1024px) {
    .article-reader {
        max-width: 680px !important;
    }
}

/* ==================== 大屏幕优化 (> 1440px) ==================== */
@media (min-width: 1440px) {
    .article-reader {
        max-width: 800px !important;
    }

    .article-content {
        max-width: 72ch !important;
    }
}
/* ==================== 关键动画 ==================== */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}