:root {
    --color-bg: #DAD2BC;
    --color-primary: #425A77;
    --color-accent: #800000;
    --font-main: 'Helvetica Neue', Arial, sans-serif;
    --font-handwriting: 'La Belle Aurore', cursive;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
body {
    background-color: var(--color-bg);
    color: var(--color-primary);
    font-family: var(--font-main);
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.top-nav {
    position: fixed;
    top: 5vh;
    left: 5vw;
    z-index: 200;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.8rem;
}

.top-nav a {
    font-family: var(--font-handwriting);
    font-size: clamp(1.2rem, 1.8vw, 1.8rem);
    color: #FFFFFF;
    text-decoration: none;
    line-height: 1.2;
    transition: opacity 0.3s ease;
    text-align: center;
}

.top-nav a:hover { opacity: 0.7; }

.scroll-container {
    position: relative;
    height: 420vh;
}

.sticky-viewport {
    position: sticky;
    top: 0;
    height: 100vh;
    overflow: hidden;
    background-color: var(--color-bg);
}

.hero-text-layer {
    position: absolute;
    left: 6vw;
    bottom: 18vh;
    z-index: 10;
    width: fit-content;
}
.greeting { font-family: 'IM Fell English', serif; font-size: clamp(1.6rem, 2.3vw, 2.3rem); color: var(--color-accent); }
.name {
    font-family: 'IM Fell English', serif;
    font-size: clamp(4rem, 7vw, 6.5rem);
    color: var(--color-accent);
    font-weight: 400;
}
.subtitle { font-family: 'IM Fell English', serif; font-size: clamp(1.4rem, 2vw, 2.2rem); color: var(--color-primary); margin-top: 1.2rem; }

.otter-container { position: absolute; top: -5vh; right: -25vw; width: min(58vw, 1550px); z-index: 5; }
.otter-img { width: 100%; height: auto; }

.fountain-container {
    position: fixed;
    bottom: -12vh;
    right: -12vw;
    width: min(37vw,1550px);
    z-index: 9;
    transform: translateY(100%);
    opacity: 0;
    pointer-events: none;
}
.fountain-img { width: 100%; height: auto; }

.story-section {
    position: absolute;
    left: 18vw;
    top: 35vh;
    width: min(62vw, 820px);
    z-index: 15;
    pointer-events: none;
    opacity: 0;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}
.about-title {
    font-family: 'IM Fell English', serif;
    font-size: clamp(4rem, 7vw, 6.5rem);
    color: var(--color-accent);
    text-align: left;
    font-weight: 400;
    letter-spacing: -0.01em;
    opacity: 0.95;
}
.about-intro { margin-top: 1.2rem; font-family: 'IM Fell English', serif; font-size: clamp(1.15rem, 1.45vw, 1.55rem); color: #000000; text-align: left; line-height: 1.55; }
.about-intro p { margin-bottom: 1.6rem; }
.about-intro p:last-child { margin-bottom: 0; }


.content-section {
    min-height: 100vh;
    padding: 15vh 8vw 15vh;
    background-color: transparent;
    position: relative;
    z-index: 30;
}

.content-section h2 {
    font-family: 'IM Fell English', serif;
    font-size: clamp(4rem, 7vw, 6.5rem);
    color: var(--color-accent);
    text-align: center;
    margin-bottom: 5rem;
    font-weight: 400;
    letter-spacing: -0.01em;
    opacity: 0.95;
}

.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 4rem;
    max-width: 1200px;
    margin: 0 auto;
}

.library-card {
    background: #F2EFE6;
    padding: 2.2rem 2rem;
    cursor: pointer;
    position: relative;
    border: none;
    transition: all 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    min-height: 200px;
    display: flex;
    flex-direction: column;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

.library-card:hover {
    transform: translateY(-4px) rotate(-0.5deg);
    box-shadow: 0 15px 25px -10px rgba(0,0,0,0.15);
}

.library-card::before {
    content: "";
    position: absolute;
    bottom: 0;
    right: 0;
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, transparent 80%, rgba(0,0,0,0.05) 100%);
    pointer-events: none;
}

.card-header {
    font-family: var(--font-handwriting);
    font-size: 1.2rem;
    color: #000000;
    margin-bottom: 1.2rem;
    opacity: 0.6;
    letter-spacing: 0.5px;
}

.card-title {
    font-family: 'IM Fell English', serif;
    font-weight: 400;
    font-size: 1.5rem;
    color: var(--color-accent);
    line-height: 1.4;
    margin-top: auto;
}


.mindmap-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background-color: var(--color-bg);
    z-index: 300;
    display: flex;
    justify-content: center;
    align-items: center;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.4s ease;
}
.mindmap-modal.active { opacity: 1; pointer-events: auto; }
.close-btn { position: absolute; top: 5vh; right: 6vw; font-family: var(--font-handwriting); font-size: 1.8rem; color: var(--color-accent); background: none; border: none; cursor: pointer; z-index: 301; }

/* mindmap 搜索框 */
.markmap-search-bar {
    position: absolute;
    top: 5vh;
    left: 50%;
    transform: translateX(-50%);
    z-index: 302;
    width: clamp(220px, 32vw, 360px);
    padding: 0.55em 1.2em;
    font-family: 'IM Fell English', serif;
    font-size: 1.05rem;
    color: var(--color-primary);
    background: rgba(255,255,255,0.6);
    border: 1px solid rgba(66, 90, 119, 0.4);
    border-radius: 999px;
    outline: none;
    backdrop-filter: blur(4px);
    transition: border-color 0.2s ease, background 0.2s ease;
}
.markmap-search-bar:focus {
    border-color: var(--color-accent);
    background: rgba(255,255,255,0.85);
}
.markmap-search-bar::placeholder {
    color: var(--color-primary);
    opacity: 0.55;
}

/* mindmap 搜索命中高亮 */
g.markmap-node.search-match foreignObject > * {
    background-color: rgba(128, 0, 0, 0.12);
    border-radius: 3px;
    padding: 0 0.2em;
}
g.markmap-node.search-match > circle {
    stroke: var(--color-accent) !important;
    stroke-width: 3.5px !important;
}
.mindmap-content { position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%); width: 85vw; height: 85vh; opacity: 0; visibility: hidden; }
.mindmap-content.active { opacity: 1; visibility: visible; }
.markmap { width: 100%; height: 100%; }
.markmap svg path, .markmap svg line { stroke-width: 3px !important; stroke-linecap: round !important; stroke-linejoin: round !important; }

/* Portfolio 卡片：嵌在 About Me 内部，跟随上升，水平居中 */
.portfolio-card {
    align-self: center;
    width: min(560px, 95%);
    min-height: 300px;
    padding: 2.2rem 2rem;
    margin-top: 5.5rem;
    overflow: hidden;
    position: relative;
    pointer-events: auto;
}
.portfolio-card .portfolio-title {
    font-size: clamp(2rem, 3vw, 2.8rem);
}
/* 探照灯图层：通用，背景图由内联 style 提供 */
.spotlight-layer {
    position: absolute;
    inset: 0;
    background-size: cover;
    background-position: center;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.25s ease;
    --x: 50%;
    --y: 50%;
    -webkit-mask-image: radial-gradient(circle 90px at var(--x) var(--y), rgba(0,0,0,1) 55%, rgba(0,0,0,0) 100%);
            mask-image: radial-gradient(circle 90px at var(--x) var(--y), rgba(0,0,0,1) 55%, rgba(0,0,0,0) 100%);
}
.library-card:hover .spotlight-layer { opacity: 1; }

/* HCI 卡片：体积小，圆圈半径相应缩小 */
.hci-card { overflow: hidden; position: relative; }
.hci-card .spotlight-layer {
    -webkit-mask-image: radial-gradient(circle 65px at var(--x) var(--y), rgba(0,0,0,1) 55%, rgba(0,0,0,0) 100%);
            mask-image: radial-gradient(circle 65px at var(--x) var(--y), rgba(0,0,0,1) 55%, rgba(0,0,0,0) 100%);
}

/* Portfolio 卡片 card-header（film & literature）：统一成 serif 字体 */
.portfolio-card .card-header {
    font-family: 'IM Fell English', serif;
    font-size: clamp(1.3rem, 1.6vw, 1.55rem);
    letter-spacing: 0;
    opacity: 0.7;
}

/* PDF 弹窗（同 mindmap 风格） */
.pdf-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background-color: var(--color-bg);
    z-index: 300;
    display: flex;
    justify-content: center;
    align-items: center;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.4s ease;
}
.pdf-modal.active { opacity: 1; pointer-events: auto; }
.pdf-content {
    width: 90vw;
    height: 92vh;
    overflow-y: auto;
    overflow-x: hidden;
    padding: 2vh 0;
    display: flex;
    flex-direction: column;
    align-items: center;
}
.pdf-pages-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2vh;
    width: 100%;
}
.pdf-page {
    width: min(820px, 92%);
    height: auto;
    box-shadow: 0 6px 22px rgba(0,0,0,0.18);
    background: #ffffff;
}
.pdf-loading {
    font-family: 'IM Fell English', serif;
    font-size: 1.5rem;
    color: var(--color-accent);
    padding: 6rem 0;
    opacity: 0.7;
}

.in-progress-text {
    font-family: var(--font-handwriting);
    font-size: 1.2rem;
    color: #000000;
    text-align: center;
    opacity: 0.6;
    letter-spacing: 0.5px;
}

/* Click to open 小字（内联在标题右侧） */
.click-hint-inline {
    font-family: 'IM Fell English', serif;
    font-size: clamp(1.3rem, 1.7vw, 1.7rem);
    color: #425A77;
    font-weight: 400;
    letter-spacing: 0;
    margin-left: 0.6em;
    vertical-align: baseline;
    white-space: nowrap;
}
/* Click to open 小字（块级，置于大标题下方） */
.click-hint-block {
    font-family: 'IM Fell English', serif;
    font-size: clamp(1.3rem, 1.7vw, 1.7rem);
    color: #425A77;
    font-weight: 400;
    text-align: center;
    margin-top: -3.8rem; /* 拉近，抵消 h2 的 margin-bottom */
    margin-bottom: 3.8rem;
}

@media (max-width: 900px) {
    .top-nav { top: 2vh; left: 5vw; }
    .card-grid { gap: 2rem; }
}