/* ==========================================================================
   CSS Tokens & Variable Definitions
   ========================================================================== */
:root {
    --bg-color: #edebe6;
    /* 灰泥暖紙色 */
    --text-color: #000000;
    /* 極黑 */
    --border-color: #000000;
    /* 邊框黑 */
    --accent-color: #ff4500;
    /* 橘紅點綴色 */
    --font-display: "Outfit", "Noto Sans TC", sans-serif;
    --font-mono: "Space Mono", monospace;
    --border-width: 1px;

    /* 時鐘對齊格線的百分比位置 */
    --v-axis: 52%;
    --h-top: 35%;
    --h-mid: 45%;
    --h-bottom: 82%;
}

/* ==========================================================================
   Reset & Base Styles
   ========================================================================== */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: var(--font-display);
    font-size: 16px;
    line-height: 1.4;
    overflow: hidden; /* 時鐘首頁不滾動，維持滿版 */
    width: 100vw;
    height: 100vh;
}

/* ==========================================================================
   噪點質感疊加層 (Noise Overlay)
   ========================================================================== */
.noise-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    opacity: 0.55;
    z-index: 9999;
    pointer-events: none;
    filter: url(#noise-filter);
}

/* ==========================================================================
   時鐘外框 / 畫布 (Clock Frame / Artboard)
   ========================================================================== */
.clock-frame {
    position: fixed;
    top: 40px;
    bottom: 40px;
    left: 40px;
    right: 40px;
    border: var(--border-width) solid var(--border-color);
    background-color: var(--bg-color);
    overflow: hidden;
    z-index: 1;
}

/* 墨水煙霧背景層 */
.ink-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: url('bg_ink.png');
    background-size: cover;
    background-position: center;
    filter: grayscale(100%) contrast(140%) brightness(95%);
    opacity: 0;
    mix-blend-mode: multiply;
    z-index: 0;
    pointer-events: none;
    transform: scale(1.25); /* 從較大比例開始收縮 */
    animation: fade-zoom-ink 2s cubic-bezier(0.25, 1, 0.5, 1) forwards 0.1s;
}

/* ==========================================================================
   網格剖析線 (Drafting Grid Lines)
   ========================================================================== */
.grid-line {
    position: absolute;
    background-color: var(--border-color);
    z-index: 2;
}

.vertical-axis {
    left: var(--v-axis);
    top: 0;
    bottom: 0;
    width: var(--border-width);
    transform-origin: top;
    transform: scaleY(0);
    animation: draw-vertical 1.2s cubic-bezier(0.25, 1, 0.5, 1) forwards 0.2s;
}

.horizontal-bottom {
    top: var(--h-bottom);
    left: 0;
    right: 0;
    height: var(--border-width);
    transform-origin: left;
    transform: scaleX(0);
    animation: draw-horizontal 1.2s cubic-bezier(0.25, 1, 0.5, 1) forwards 0.4s;
}

.right-horizontal-top {
    top: var(--h-top);
    left: var(--v-axis);
    right: 0;
    height: var(--border-width);
    z-index: 2;
    transform-origin: left;
    transform: scaleX(0);
    animation: draw-horizontal 0.8s cubic-bezier(0.25, 1, 0.5, 1) forwards 0.7s;
}

.right-horizontal-middle {
    top: var(--h-mid);
    left: var(--v-axis);
    right: 0;
    height: var(--border-width);
    z-index: 2;
    transform-origin: left;
    transform: scaleX(0);
    animation: draw-horizontal 0.8s cubic-bezier(0.25, 1, 0.5, 1) forwards 0.8s;
}

/* ==========================================================================
   向量錨點 / 控制點 (Vector Handles / Nodes)
   ========================================================================== */
.handle {
    position: absolute;
    width: 8px;
    height: 8px;
    border: var(--border-width) solid var(--border-color);
    background-color: #ffffff;
    z-index: 10;
    transform: translate(-50%, -50%) scale(0);
    animation: pop-handle 0.4s cubic-bezier(0.34, 1.56, 0.64, 1) forwards;
}

/* 邊角點 */
.top-left { top: 0; left: 0; }
.top-right { top: 0; left: 100%; }
.bottom-left { top: 100%; left: 0; }
.bottom-right { top: 100%; left: 100%; }



/* 交點與軸端點 */
.top-axis { top: 0; left: var(--v-axis); }
.bottom-axis { top: 100%; left: var(--v-axis); }

.left-intersect-bottom { top: var(--h-bottom); left: 0; }
.right-intersect-bottom { top: var(--h-bottom); left: 100%; }
.right-intersect-top { top: var(--h-top); left: 100%; }
.right-intersect-middle { top: var(--h-mid); left: 100%; }

/* 內部中心交點 */
.intersect-top { top: var(--h-top); left: var(--v-axis); }
.intersect-middle { top: var(--h-mid); left: var(--v-axis); }
.intersect-bottom { top: var(--h-bottom); left: var(--v-axis); }

/* 控制點 staggered 動畫延遲 */
.top-left, .top-right, .bottom-left, .bottom-right {
    animation-delay: 1.1s;
}

.top-axis, .bottom-axis, .left-intersect-bottom, .right-intersect-bottom, .right-intersect-top, .right-intersect-middle {
    animation-delay: 1.3s;
}

.intersect-top, .intersect-middle, .intersect-bottom {
    animation-delay: 1.5s;
}

/* ==========================================================================
   時鐘主體與排版 (Clock Typography & Alignment)
   ========================================================================== */
.clock-label-container {
    position: absolute;
    left: var(--v-axis);
    top: var(--h-top);
    bottom: calc(100% - var(--h-mid));
    right: 0;
    display: flex;
    align-items: center;
    padding: 0 4rem 0 2rem; /* 增加右側 padding 避免在窄螢幕或大字體下被外框裁切 */
    z-index: 5;
    box-sizing: border-box;
}

.clock-display-container {
    position: absolute;
    left: var(--v-axis);
    top: var(--h-mid);
    bottom: calc(100% - var(--h-bottom));
    right: 0;
    display: flex;
    align-items: center;
    padding: 0 4rem 0 2rem; /* 增加右側 padding 避免被裁切 */
    z-index: 5;
    box-sizing: border-box;
}

.clock-label {
    font-family: var(--font-display);
    font-size: clamp(1rem, 2vw, 1.8rem);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--text-color);
    line-height: 1;
    margin-bottom: 0.4rem;
    opacity: 0;
    transform: translateY(12px);
    animation: fade-slide-up 0.8s cubic-bezier(0.25, 1, 0.5, 1) forwards 1.2s;
}

.clock-display {
    font-family: var(--font-display);
    font-size: clamp(3rem, 11vw, 12rem); /* 稍微縮小字型以防止在大螢幕或特定寬度下被右側裁切 */
    font-weight: 900;
    line-height: 0.75;
    letter-spacing: -0.06em;
    color: var(--text-color);
    display: flex;
    align-items: center;
    opacity: 0;
    transform: translateY(20px);
    animation: fade-slide-up 1s cubic-bezier(0.25, 1, 0.5, 1) forwards 1.4s;
}

/* 自訂冒號 */
.clock-colon {
    display: inline-flex;
    flex-direction: column;
    justify-content: center;
    gap: 0.16em;
    margin: 0 0.05em;
    height: 1em;
    vertical-align: middle;
    transform: translateY(-0.04em);
}

.colon-dot {
    width: 0.08em;
    height: 0.08em;
    background-color: #8c8a82; /* 參照圖中的灰色方格 */
    transition: opacity 0.5s ease;
}

/* 秒數顯示 (上標精緻化) */
.clock-seconds-wrapper {
    font-family: var(--font-display);
    font-size: 0.22em;
    font-weight: 900; /* 與主時鐘數字的超粗體風格完全一致 */
    color: var(--accent-color);
    align-self: flex-start;
    margin-top: 0.1em;
    margin-left: 0.15em;
    letter-spacing: -0.02em; /* 使用微收緊的字距，符合 Outfit 字型美感 */
}

/* ==========================================================================
   四角標籤與資訊 (Corner Labels & Nav)
   ========================================================================== */
.corner-label {
    position: absolute;
    font-family: var(--font-mono);
    font-size: 0.8rem;
    text-transform: uppercase;
    color: var(--text-color);
    z-index: 5;
    opacity: 0;
    animation: fade-in 1s ease forwards 1.6s;
}

.top-left-text {
    top: 20px;
    left: 20px;
}

.top-right-nav {
    top: 15px;
    right: 20px;
}

.bottom-left-text {
    bottom: 20px;
    left: 20px;
}

.bottom-right-text {
    bottom: 20px;
    right: 20px;
}

/* 瑞士粗獷導覽連結 */
.nav-link {
    color: var(--text-color);
    text-decoration: none;
    border: 1px solid var(--border-color);
    padding: 0.4rem 0.8rem;
    font-weight: 700;
    transition: all 0.2s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    background-color: transparent;
    display: inline-block;
}

.nav-link:hover {
    background-color: var(--border-color);
    color: var(--bg-color);
}

.author-link {
    color: inherit;
    text-decoration: none;
    border-bottom: 1px solid transparent;
    transition: all 0.2s ease;
    text-transform: none; /* Keep the exact casing of 'Rudy' */
}

.author-link:hover {
    color: var(--accent-color);
    border-bottom-color: var(--accent-color);
}

/* ==========================================================================
   響應式設計 (Responsive Design)
   ========================================================================== */
@media (max-width: 992px) {
    .clock-frame {
        top: 20px;
        bottom: 20px;
        left: 20px;
        right: 20px;
    }
    :root {
        --v-axis: 48%;
        --h-top: 35%;
        --h-mid: 45%;
        --h-bottom: 82%;
    }
    .clock-label-container, .clock-display-container {
        padding: 0 2.5rem 0 1.5rem;
    }
}

@media (max-width: 768px) {
    :root {
        --v-axis: 12%; /* 格線推到最左側，保留設計張力 */
        --h-top: 30%;
        --h-mid: 42%;
        --h-bottom: 82%;
    }
    .clock-label-container, .clock-display-container {
        padding: 0 1.5rem 0 1rem;
    }
    .corner-label {
        font-size: 0.65rem;
    }
    .top-left-text, .bottom-right-text {
        display: none; /* 在極小螢幕隱藏次要資訊 */
    }
    .bottom-left-text {
        bottom: 15px;
        left: 15px;
    }
    .top-right-nav {
        top: 10px;
        right: 15px;
    }
}

/* ==========================================================================
   動畫效果 Keyframes (Entrance Animations)
   ========================================================================== */
@keyframes draw-vertical {
    0% { transform: scaleY(0); }
    100% { transform: scaleY(1); }
}

@keyframes draw-horizontal {
    0% { transform: scaleX(0); }
    100% { transform: scaleX(1); }
}

@keyframes pop-handle {
    0% { transform: translate(-50%, -50%) scale(0); }
    100% { transform: translate(-50%, -50%) scale(1); }
}

@keyframes fade-zoom-ink {
    0% { opacity: 0; transform: scale(1.25); }
    100% { opacity: 0.25; transform: scale(1.15); }
}

@keyframes fade-slide-up {
    0% { opacity: 0; transform: translateY(15px); }
    100% { opacity: 1; transform: translateY(0); }
}

@keyframes fade-in {
    0% { opacity: 0; }
    100% { opacity: 1; }
}