/* ========================================================
   日月初候 - 深色系自然物候历法美学
   响应式断点：1400px, 1280px, 960px, 640px
   配色：夜空黑、复古金、深邃灰
======================================================== */

:root {
    --bg-color: #0b0e14;
    --panel-bg: #141820;
    --text-primary: #e6dfcc;
    --text-secondary: #848a96;
    --accent-gold: #c4a77d;
    --accent-gold-dark: #8c7653;
    --border-color: #242b35;
    
    --font-sans: "PingFang SC", "Helvetica Neue", Helvetica, Arial, sans-serif;
    --font-serif: "Noto Serif SC", STSong, "Songti SC", serif;
    --font-mono: "Fira Code", monospace;
}

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

body {
    background-color: var(--bg-color);
    color: var(--text-primary);
    font-family: var(--font-sans);
    line-height: 1.6;
    overflow-x: hidden;
}

/* 背景氛围层 */
.cosmos-bg {
    position: fixed;
    top: 0; left: 0; width: 100vw; height: 100vh;
    background: radial-gradient(circle at 50% 0%, #171d29 0%, #0b0e14 70%);
    z-index: -1;
}

/* 核心布局框架：左侧导航 + 右侧内容 */
.site-container {
    display: flex;
    max-width: 1400px;
    margin: 0 auto;
    min-height: 100vh;
}

/* 垂直侧边栏 */
.sidebar-nav {
    width: 280px;
    border-right: 1px solid var(--border-color);
    padding: 3rem 2rem;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    position: sticky;
    top: 0;
    height: 100vh;
}

.vertical-title h1 {
    font-family: var(--font-serif);
    font-size: 2.2rem;
    font-weight: 400;
    color: var(--accent-gold);
    letter-spacing: 4px;
    writing-mode: vertical-rl;
    margin: 0 auto 1.5rem auto;
}
.vertical-title p {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 2px;
    text-align: center;
}

.nav-menu {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2.5rem;
}
.nav-menu a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 1.1rem;
    writing-mode: vertical-rl;
    letter-spacing: 6px;
    transition: all 0.4s ease;
    position: relative;
}
.nav-menu a:hover {
    color: var(--accent-gold);
}
.nav-menu a::after {
    content: '';
    position: absolute;
    left: -10px; top: 0;
    height: 100%; width: 1px;
    background: var(--accent-gold);
    transform: scaleY(0);
    transition: transform 0.4s ease;
}
.nav-menu a:hover::after { transform: scaleY(1); }

.sidebar-footer {
    text-align: center;
    font-size: 0.85rem;
    color: var(--border-color);
    writing-mode: vertical-rl;
    margin: 0 auto;
    letter-spacing: 4px;
}

/* 主体内容区 */
.main-wrapper {
    flex: 1;
    padding: 0 4rem;
}

/* 通用区块间距 */
section {
    padding: 5rem 0;
    border-bottom: 1px solid var(--border-color);
}
section:last-child { border-bottom: none; }

/* 版块标题 */
.section-heading {
    margin-bottom: 3rem;
}
.section-heading h3 {
    font-family: var(--font-serif);
    font-size: 2rem;
    font-weight: normal;
    color: var(--text-primary);
}
.en-subtitle {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--accent-gold-dark);
    text-transform: uppercase;
    letter-spacing: 3px;
    margin-top: 5px;
}
.divider-line {
    width: 60px;
    height: 2px;
    background: var(--accent-gold);
    margin-top: 15px;
}

/*================ 每日物候演进 (版块一) ================*/
.daily-hero {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}
.hero-image-box {
    position: relative;
    border-radius: 4px;
    overflow: hidden;
}
.hero-image-box img {
    width: 100%;
    height: 600px;
    object-fit: cover;
    filter: brightness(0.85) contrast(1.1);
    transition: transform 1s ease;
}
.hero-image-box:hover img {
    transform: scale(1.05);
}
.image-overlay {
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    background: linear-gradient(to right, rgba(11,14,20,0.1), rgba(11,14,20,0.5));
}

.daily-content-box {
    position: relative;
    padding: 2rem 0;
}
.date-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 1rem;
    margin-bottom: 2rem;
}
.lunar-date {
    font-family: var(--font-serif);
    font-size: 1.2rem;
    color: var(--accent-gold);
}
.solar-date {
    font-family: var(--font-mono);
    color: var(--text-secondary);
}
.daily-title {
    font-family: var(--font-serif);
    font-size: 3rem;
    font-weight: 500;
    margin-bottom: 2rem;
    letter-spacing: 2px;
}
.daily-prose {
    font-size: 1.1rem;
    line-height: 2.2;
    color: var(--text-secondary);
    text-align: justify;
    margin-bottom: 3rem;
}
.daily-seal {
    display: inline-block;
    border: 1px solid #8c3b3b;
    color: #8c3b3b;
    padding: 4px 10px;
    font-family: var(--font-serif);
    font-size: 0.9rem;
    border-radius: 2px;
}

/*================ 天地流影 画廊 (版块二) ================*/
.masonry-grid {
    display: grid;
    grid-template-columns: repeat(12, 1fr);
    gap: 2rem;
}
.grid-item {
    position: relative;
    overflow: hidden;
    background: var(--panel-bg);
}
.grid-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    opacity: 0.8;
    transition: all 0.5s ease;
}
.grid-item:hover img {
    opacity: 1;
    transform: scale(1.03);
}
.item-text {
    position: absolute;
    bottom: 0; left: 0; width: 100%;
    padding: 2rem;
    background: linear-gradient(transparent, rgba(0,0,0,0.9));
}
.item-text h4 {
    font-family: var(--font-serif);
    color: var(--accent-gold);
    font-size: 1.3rem;
    margin-bottom: 5px;
}
.item-text p {
    font-size: 0.9rem;
    color: #bbb;
}

/* 网格排布尺寸 */
.size-large { grid-column: span 7; height: 500px; }
.size-small { grid-column: span 5; height: 500px; }
.size-medium { grid-column: span 4; height: 400px; }
.size-wide { grid-column: span 8; height: 400px; }

/*================ 历法网格 (版块三) ================*/
.calendar-board {
    background: var(--panel-bg);
    border: 1px solid var(--border-color);
    padding: 2rem;
}
.cal-controls {
    display: flex;
    justify-content: flex-end;
    margin-bottom: 2rem;
}
.cal-month-indicator {
    font-family: var(--font-serif);
    color: var(--accent-gold);
    font-size: 1.2rem;
    letter-spacing: 2px;
}
.cal-matrix {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 1px;
    background: var(--border-color);
    border: 1px solid var(--border-color);
}
.cal-th, .cal-td {
    background: var(--panel-bg);
}
.cal-th {
    padding: 1rem 0;
    text-align: center;
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--text-secondary);
}
.cal-td {
    min-height: 120px;
    padding: 1rem;
    transition: background 0.3s;
}
.cal-td:hover {
    background: #1a1e27;
}
.cal-td.empty { background: transparent; }
.day-num {
    font-family: var(--font-mono);
    font-size: 1.4rem;
    color: var(--text-primary);
}
.day-term {
    font-family: var(--font-serif);
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-top: 8px;
}
.term-highlight {
    color: var(--accent-gold);
}
.today {
    background: rgba(196, 167, 125, 0.05);
    position: relative;
}
.today::before {
    content: '';
    position: absolute;
    top: 0; left: 0; width: 100%; height: 2px;
    background: var(--accent-gold);
}
.today .day-num { color: var(--accent-gold); }

/*================ 响应式适配 ================*/
@media (max-width: 1280px) {
    .site-container { max-width: 1280px; }
    .daily-hero { grid-template-columns: 1fr; gap: 2rem; }
    .hero-image-box img { height: 400px; }
}
@media (max-width: 960px) {
    .site-container { max-width: 960px; flex-direction: column; }
    .sidebar-nav {
        width: 100%; height: auto; flex-direction: row; align-items: center;
        padding: 1.5rem 2rem; border-right: none; border-bottom: 1px solid var(--border-color);
        position: relative;
    }
    .vertical-title h1 { writing-mode: horizontal-tb; letter-spacing: 2px; margin: 0 0 5px 0; font-size: 1.8rem; }
    .nav-menu { flex-direction: row; gap: 1.5rem; }
    .nav-menu a { writing-mode: horizontal-tb; letter-spacing: 2px; }
    .nav-menu a::after { left: 0; top: auto; bottom: -5px; height: 1px; width: 100%; transform: scaleX(0); transition: transform 0.4s ease; }
    .nav-menu a:hover::after { transform: scaleX(1); }
    .sidebar-footer { display: none; }
    .main-wrapper { padding: 0 2rem; }
    
    .size-large, .size-small, .size-medium, .size-wide { grid-column: span 12; height: 350px; }
}
@media (max-width: 640px) {
    .site-container { max-width: 640px; }
    .cal-matrix { gap: 0; border: none; }
    .cal-td { min-height: 80px; padding: 0.5rem; border: 1px solid var(--border-color); }
    .day-num { font-size: 1.1rem; }
    .nav-menu { display: none; }
    .daily-title { font-size: 2.2rem; }
    section { padding: 3rem 0; }
}