@import url('https://fonts.googleapis.com/css2?family=Fira+Code:wght@400;700&display=swap');

:root {
    --main-bg: #002b36; --main-text: #b8c9d0; --accent-color-1: #268bd2; --accent-color-2: #b58900;
    --border-color: rgba(131, 148, 150, 0.25); --window-bg: #073642; --title-bar-bg: #001f27;
    --font-mono: 'Fira Code', 'Courier New', Courier, monospace; --scanline-opacity: 0.03;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
    background-color: var(--main-bg); color: var(--main-text); font-family: var(--font-mono);
    line-height: 1.7; overflow-x: hidden;
}
body::after {
    content: ''; position: fixed; top: 0; left: 0; width: 100%; height: 100%;
    background: repeating-linear-gradient(0deg, rgba(0,0,0,var(--scanline-opacity)), rgba(0,0,0,var(--scanline-opacity)) 1px, transparent 1px, transparent 2px);
    pointer-events: none; z-index: 9999;
}
h1, h2, h3, h4 { text-shadow: 0 0 5px rgba(38, 139, 210, 0.2); }
a { color: var(--accent-color-1); text-decoration: none; transition: background-color 0.2s, color 0.2s; }
a:hover { background-color: var(--accent-color-1); color: var(--main-bg); }
.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }
.main-content { padding-top: 100px; }

/* --- Navbar --- */
.cmd-navbar {
    position: fixed; top: 0; left: 0; width: 100%; background-color: rgba(7, 54, 66, 0.85);
    backdrop-filter: blur(8px); border-bottom: 1px solid var(--border-color);
    padding: 10px 20px; z-index: 1000;
}
.navbar-content {
    display: flex; justify-content: space-between; align-items: center;
    max-width: 1200px; margin: 0 auto; position: relative;
}
.navbar-brand { font-weight: 700; color: var(--accent-color-2) !important; flex-shrink: 0; }
.navbar-links a { margin: 0 10px; padding: 5px 10px; border-radius: 4px; white-space: nowrap; }
/* 用於標示當前頁面的樣式 */
.navbar-links a.active { 
    background-color: var(--accent-color-1);
    color: var(--main-bg) !important; 
}

/* RWD: 漢堡菜單按鈕 */
.navbar-toggler { display: none; background: none; border: 1px solid var(--border-color); cursor: pointer; padding: 8px; border-radius: 4px; z-index: 1001; }
.navbar-toggler span { display: block; width: 22px; height: 2px; background-color: var(--main-text); margin: 5px 0; transition: transform 0.3s, opacity 0.3s; }

/* Hero Section */
.hero { min-height: 100vh; display: flex; align-items: center; justify-content: center; text-align: left; padding: 0 20px; }
.hero-content { max-width: 800px; width: 100%; }
.prompt { font-size: 2.5rem; font-weight: 700; display: flex; align-items: center; flex-wrap: wrap; }
.typewriter { border-right: .15em solid var(--main-text); white-space: nowrap; overflow: hidden; animation: typing 3s steps(30, end), blink-caret .75s step-end infinite; }
@keyframes typing { from { width: 0 } to { width: 100% } }
@keyframes blink-caret { from, to { border-color: transparent } 50% { border-color: var(--main-text); } }
.subtitle { font-size: 1.2rem; color: var(--main-text); opacity: 0.8; margin: 10px 0 30px; }
.cmd-button { display: inline-block; padding: 10px 20px; border: 1px solid var(--accent-color-1); color: var(--accent-color-1); background-color: transparent; cursor: pointer; }
.cmd-button:hover { background-color: var(--accent-color-1); color: var(--main-bg); }

/* CMD Window Style */
.cmd-section { padding: 40px 0; }
.cmd-window { border: 1px solid var(--border-color); background-color: var(--window-bg); box-shadow: 0 0 15px rgba(0,0,0,0.5); }
.title-bar { background-color: var(--title-bar-bg); padding: 5px 10px; border-bottom: 1px solid var(--border-color); }
.title-bar .title { font-weight: 700; color: var(--main-text); }
.cmd-window .content { padding: 20px; }
.section-title { font-size: 1.5rem; font-weight: 700; margin-bottom: 25px; display: inline-block; color: var(--accent-color-1); }
.section-title::after { content: '█'; animation: blink-caret .75s step-end infinite; }
.row { display: flex; flex-wrap: wrap; margin: 0 -15px; }
.col-md-4, .col-md-5, .col-md-6, .col-md-7, .col-md-8 { padding: 0 15px; margin-bottom: 20px; width: 100%; }

/* Specific Sections */
#whoami ul { list-style-type: ' > '; padding-left: 20px; }
.code-block { background-color: rgba(0,0,0,0.2); border-left: 3px solid var(--accent-color-1); padding: 15px; margin-top: 10px; font-size: 0.9em; word-break: break-word; }
.skill-list .skill-item { display: flex; align-items: center; margin-bottom: 8px; font-size: 0.9em; flex-wrap: wrap; }
.skill-list .skill-item .skill-name { width: 120px; flex-shrink: 0; }
.skill-list .skill-item .skill-progress-bar { font-family: monospace; letter-spacing: 0; color: var(--accent-color-2); }
.skill-list .skill-item .skill-progress-bar .fill { text-shadow: 0 0 5px var(--accent-color-2); }
.skill-list .skill-item .skill-progress-bar .empty { opacity: 0.2; color: var(--main-text); }
.skill-list .skill-item .skill-percent { width: 45px; text-align: right; flex-shrink: 0; padding-left: 5px; }
.file-list a { display: block; margin-bottom: 5px; cursor: pointer; }
.blog-reader { border: 1px solid var(--border-color); padding: 15px; min-height: 300px; background-color: rgba(0,0,0,0.2); }
.blog-reader .placeholder { color: rgba(184, 201, 208, 0.5); }
.blog-reader h3 { color: var(--accent-color-2); }
.blog-reader .date { font-size: 0.8em; color: rgba(184, 201, 208, 0.6); margin-bottom: 15px; }
.blog-reader .content { white-space: pre-wrap; word-break: break-word; }
.timeline-cmd .entry { margin-bottom: 15px; }
.timeline-cmd .year { font-weight: 700; color: var(--accent-color-2); }
.timeline-cmd p { margin: 0 0 5px 15px; position: relative; }
.timeline-cmd p::before { content: '└─'; position: absolute; left: -15px; }
.list-container { border: 1px solid var(--border-color); padding: 15px; height: 100%; }
.list-container h4 { color: var(--accent-color-1); border-bottom: 1px solid var(--border-color); padding-bottom: 5px; margin-bottom: 10px; }
.list-container ul { list-style: none; padding-left: 0; }
.list-container li { margin-bottom: 5px; }
.award-badge { background-color: var(--accent-color-2); color: var(--main-bg); padding: 2px 6px; font-size: 0.8em; font-weight: 700; display: inline-block; margin-top: 3px;}
.cert-grid { display: flex; flex-wrap: wrap; gap: 10px; }
.cert-item { padding: 5px 10px; border: 1px solid var(--border-color); background-color: rgba(137, 221, 255, 0.1); }
.calendar-container { position: relative; padding-bottom: 75%; height: 0; overflow: hidden; min-height: 500px; }
.calendar-iframe { position: absolute; top: 0; left: 0; width: 100%; height: 100%; border: 1px solid var(--border-color); filter: invert(90%) hue-rotate(180deg) contrast(90%); }

/* Footer */
.footer { border-top: 1px solid var(--border-color); padding: 30px 20px; text-align: center; margin-top: 50px; }
.footer-content { max-width: 1200px; margin: 0 auto; }
.footer .social-links a { margin: 0 10px; }
.visitor-counter { margin: 15px 0; color: rgba(184, 201, 208, 0.7); }
.visitor-counter .digit { display: inline-block; }
.visitor-counter .separator { margin: 0 10px; }
.copyright { font-size: 0.8em; color: rgba(184, 201, 208, 0.5); }

/* --- RWD Media Queries --- */
/* For tablets and larger screens (>= 768px) */
@media (min-width: 768px) {
    .col-md-4 { width: 33.33%; } .col-md-5 { width: 41.66%; } .col-md-6 { width: 50%; }
    .col-md-7 { width: 58.33%; } .col-md-8 { width: 66.66%; }
}

/* For small screens (mobile, < 768px) */
@media (max-width: 767px) {
    .prompt { font-size: 1.5rem; }
    .navbar-toggler { display: block; }
    .navbar-links {
        display: none; flex-direction: column; width: 100%;
        background-color: var(--window-bg); position: absolute;
        top: 100%; left: 0; border-top: 1px solid var(--border-color);
        box-shadow: 0 10px 15px rgba(0,0,0,0.3); z-index: 1000;
    }
    /* ▼▼▼▼▼ 修正點 ▼▼▼▼▼ */
    /* 使用 .is-open 來控制菜單顯示，而不是 .active */
    .navbar-links.is-open {
        display: flex; 
    }
    /* ▲▲▲▲▲ 修正點 ▲▲▲▲▲ */
    .navbar-links a { padding: 15px 20px; width: 100%; text-align: center; margin: 0; border-bottom: 1px solid var(--border-color); }
    .navbar-links a:last-child { border-bottom: none; }
    .skill-list .skill-item { flex-direction: column; align-items: flex-start; }
    .skill-list .skill-item .skill-progress-bar { width: 100%; margin: 5px 0; }
    .row { flex-direction: column; }
    .col-md-4, .col-md-5, .col-md-6, .col-md-7, .col-md-8 { width: 100%; }
}