/* =====================================================
   NGDC 北科遊戲研究社 — 共用樣式表
   復古電玩 / 像素風 / 8-bit 風格
   五個頁面（index / about / events / join / contact / projects）
   皆共用本檔案，請勿在各頁面內重複定義樣式。
   ===================================================== */

/* Cubic 11 — 開源繁體中文像素字型，授權 SIL OFL。
   來源：https://github.com/ACh-K/Cubic-11
   字型檔與授權條款放在 assets/fonts/，自行 host 避免外部 CDN 失效。 */
@font-face {
  font-family: "Cubic 11";
  src: url("../assets/fonts/Cubic_11.woff2") format("woff2");
  font-weight: normal;
  font-style: normal;
  font-display: swap;
}

:root {
  --color-bg: #0c1f33;
  --color-bg-deep: #091628;
  --color-bg-alt: #102742;
  --color-bg-card: #122c4a;
  --color-blue-bright: #3fa9f5;
  --color-blue-mid: #3a7fa8;
  --color-blue-dim: #2c5a7a;
  --color-blue-pale: #7fb8e6;
  --color-border-soft: #1d3a55;
  --color-yellow: #d6bf12;
  --color-yellow-cta: #d6bf12;
  --color-white: #ffffff;
  --color-white-dim: rgba(255, 255, 255, 0.72);
  --font-pixel: "Cubic 11", "Noto Sans TC", monospace;
  --font-body: "Noto Sans TC", "Microsoft JhengHei", "Helvetica Neue", Arial, sans-serif;
  --container-width: 1100px;
  --header-height: 72px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background-color: var(--color-bg);
  color: var(--color-white);
  font-family: var(--font-body);
  line-height: 1.7;
  font-size: 16px;
  position: relative;
  overflow-x: hidden;
}

h1, h2, h3, h4 {
  font-family: var(--font-pixel);
  color: var(--color-yellow);
  line-height: 1.5;
  margin: 0 0 1rem;
  letter-spacing: 0.5px;
}

h1 { font-size: 1.6rem; }
h2 { font-size: 1.25rem; }
h3 { font-size: 1rem; }
h4 { font-size: 0.85rem; }

p {
  color: var(--color-white-dim);
  margin: 0 0 1rem;
}

a {
  color: var(--color-blue-bright);
  text-decoration: none;
}

a:hover {
  color: var(--color-yellow);
}

ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

img {
  max-width: 100%;
  display: block;
}

.container {
  width: 100%;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 1.5rem;
  position: relative;
  z-index: 1;
}

/* =====================================================
   兩側海浪式像素方塊裝飾
   固定式（非隨機）裝飾，只出現在頁面左右兩側留白區域。
   裝飾包在每個 section 內部（而不是整頁），跟著該 section
   自己的高度走，所以區塊與區塊交界處會自然斷開，不會變成
   貫穿全頁的一條長條。要套用裝飾的 section 必須是
   position: relative（.hero 和 .section 都已經設定好）。

   結構是「多個橫排（row）由上到下排列」，每排從頁面外側邊緣
   往中央內容方向排列方塊；每排的方塊「數量」由 js/main.js
   依正弦波計算（週期拉長、振幅縮小，做出寬緩不尖銳的海浪
   起伏），同一排內的顏色固定 4 階、由外到內依序變亮，
   跟這排總共幾顆方塊無關（最外側永遠最暗）。

   橫排與方塊本身只是 <div>，沒有任何文字或可互動內容，
   JS 只負責讀取容器高度後計算要鋪幾排、每排幾顆方塊。
   寬螢幕才有足夠留白顯示，較窄螢幕（< 1400px）直接隱藏。
   z-index 低於 .container，不會蓋到文字內容。
   ===================================================== */
.wave-decoration {
  position: absolute;
  top: 0;
  bottom: 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 36px 20px;
  z-index: 0;
  pointer-events: none;
  overflow: hidden;
}

.wave-decoration--left {
  left: 0;
}

.wave-decoration--right {
  right: 0;
}

.wave-decoration--right .wave-row {
  flex-direction: row-reverse;
}

.wave-row {
  display: flex;
  gap: 4px;
}

.wave-square {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
}

@media (max-width: 1399px) {
  .wave-decoration {
    display: none;
  }
}

/* =====================================================
   頂部導覽列
   ===================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background-color: rgba(12, 31, 51, 0.92);
  border-bottom: 2px solid var(--color-blue-dim);
  -webkit-backdrop-filter: blur(4px);
  backdrop-filter: blur(4px);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-height);
}

.logo {
  font-family: "Press Start 2P", monospace;
  font-size: 0.95rem;
  color: var(--color-yellow);
}

.logo:hover {
  color: var(--color-blue-bright);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 36px;
  height: 32px;
  background: transparent;
  border: 2px solid var(--color-blue-bright);
  cursor: pointer;
  padding: 4px;
}

.nav-toggle span {
  display: block;
  height: 2px;
  background-color: var(--color-blue-bright);
}

.site-nav .nav-list {
  display: flex;
  gap: 1.75rem;
}

.site-nav .nav-list a {
  font-size: 0.85rem;
  color: var(--color-white);
  padding: 0.25rem 0.1rem;
  border-bottom: 2px solid transparent;
}

.site-nav .nav-list a:hover,
.site-nav .nav-list a[aria-current="page"] {
  color: var(--color-yellow);
  border-bottom-color: var(--color-yellow);
}

.nav-right {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.nav-social {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.nav-divider {
  width: 1px;
  height: 18px;
  background-color: var(--color-blue-dim);
}

.nav-social-link {
  font-size: 0.75rem;
  color: var(--color-blue-pale);
}

/* =====================================================
   按鈕（像素風）
   ===================================================== */
.btn {
  display: inline-block;
  font-family: var(--font-pixel);
  font-size: 0.8rem;
  font-weight: bold;
  letter-spacing: 1.5px;
  color: var(--color-bg);
  background-color: var(--color-yellow-cta);
  border: 2px solid var(--color-bg);
  padding: 0.9rem 1.4rem;
  box-shadow: 4px 4px 0 var(--color-blue-bright);
  cursor: pointer;
  transition: transform 0.08s ease, box-shadow 0.08s ease;
}

.btn:hover {
  color: var(--color-bg);
  transform: translate(2px, 2px);
  box-shadow: 2px 2px 0 var(--color-blue-bright);
}

.btn-outline {
  background-color: transparent;
  color: var(--color-blue-bright);
  border: 2px solid var(--color-blue-bright);
  box-shadow: 4px 4px 0 var(--color-blue-dim);
}

.btn-outline:hover {
  color: var(--color-yellow);
  border-color: var(--color-yellow);
}

.btn-outline-yellow {
  background-color: transparent;
  color: var(--color-yellow);
  border: 2px solid var(--color-yellow);
  box-shadow: 4px 4px 0 var(--color-blue-dim);
}

.btn-outline-yellow:hover {
  color: var(--color-yellow);
  border-color: var(--color-yellow);
  box-shadow: 2px 2px 0 var(--color-blue-dim);
}

/* =====================================================
   Hero（首頁）
   ===================================================== */
.hero {
  position: relative;
  background-color: var(--color-bg);
  padding: 4.5rem 0 3.5rem;
  text-align: center;
}

.hero-pixel-row {
  display: flex;
  justify-content: center;
  gap: 6px;
  margin-bottom: 2.5rem;
}

.hero-pixel-row span {
  width: 10px;
  height: 10px;
  background-color: var(--color-blue-dim);
}

.hero-pixel-row span:nth-child(1),
.hero-pixel-row span:nth-child(4),
.hero-pixel-row span:nth-child(5),
.hero-pixel-row span:nth-child(7) {
  background-color: var(--color-blue-bright);
}

.hero-title {
  font-size: 1.9rem;
  margin-bottom: 1.2rem;
}

.hero-tagline {
  font-family: var(--font-pixel);
  color: var(--color-white);
  font-size: 0.95rem;
  margin-bottom: 1.5rem;
}

.hero-desc {
  max-width: 560px;
  margin: 0 auto 2.2rem;
}

/* =====================================================
   通用版面區塊
   ===================================================== */
.section {
  position: relative;
  padding: 4rem 0;
}

.section-alt {
  background-color: var(--color-bg-alt);
}

.section-deep {
  background-color: var(--color-bg-deep);
}

.section-title {
  text-align: center;
  margin-bottom: 2.5rem;
}

.section-title h2 {
  margin-bottom: 0.5rem;
}

.section-title p {
  max-width: 600px;
  margin: 0 auto;
}

/* =====================================================
   一般卡片（about / join / contact 共用）
   ===================================================== */
.card {
  background-color: var(--color-bg-card);
  border: 2px solid var(--color-blue-dim);
  padding: 1.75rem;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.5rem;
}

/* =====================================================
   關於我們內容卡（首頁）
   ===================================================== */
.about-panel {
  max-width: 560px;
  margin: 0 auto;
  border: 1px solid var(--color-border-soft);
  border-radius: 4px;
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 1.75rem;
}

.about-block p {
  margin-bottom: 0;
}

/* =====================================================
   步驟流程（加入我們）
   ===================================================== */
.steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1.5rem;
  counter-reset: step;
}

.step {
  background-color: var(--color-bg-card);
  border: 2px solid var(--color-blue-dim);
  padding: 1.5rem;
  position: relative;
}

.step::before {
  counter-increment: step;
  content: counter(step);
  font-family: "Press Start 2P", monospace;
  color: var(--color-bg);
  background-color: var(--color-blue-bright);
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1rem;
}

/* =====================================================
   期許清單 / CTA 群組（加入我們）
   ===================================================== */
.join-tagline {
  font-size: 1.05rem;
  max-width: 640px;
  margin: 0 auto;
}

.perk-list {
  max-width: 680px;
  margin: 0 auto 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.perk-list li {
  color: var(--color-white-dim);
  padding-left: 1.75rem;
  position: relative;
  line-height: 1.7;
}

.perk-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.45em;
  width: 10px;
  height: 10px;
  background-color: var(--color-blue-bright);
}

.perk-note {
  max-width: 680px;
  margin: 0 auto;
  text-align: center;
  color: var(--color-blue-pale);
  font-style: italic;
}

.cta-group {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1.5rem;
}

/* =====================================================
   FAQ（聯絡我們）
   ===================================================== */
.faq-item {
  border-bottom: 1px solid var(--color-blue-dim);
  padding: 1.25rem 0;
}

.faq-item:first-child {
  padding-top: 0;
}

.faq-q {
  color: var(--color-yellow);
  font-family: var(--font-pixel);
  font-size: 0.8rem;
  margin-bottom: 0.6rem;
}

/* =====================================================
   聯絡資訊清單
   ===================================================== */
.contact-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.5rem;
}

.contact-item {
  background-color: var(--color-bg-card);
  border: 2px solid var(--color-blue-dim);
  padding: 1.5rem;
}

.contact-item h3 {
  margin-bottom: 0.5rem;
}

/* =====================================================
   活動紀錄（events.html）
   ===================================================== */
.notice-card {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  flex-wrap: wrap;
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-blue-dim);
  padding: 1.25rem 1.5rem;
  margin-bottom: 2.5rem;
}

.notice-card p {
  margin: 0;
  flex: 1;
  min-width: 180px;
}

.notice-btn {
  flex-shrink: 0;
  font-family: var(--font-pixel);
  font-size: 0.7rem;
  color: var(--color-blue-bright);
  border: 1px solid var(--color-blue-bright);
  padding: 0.5rem 0.85rem;
  white-space: nowrap;
}

.notice-btn:hover {
  color: var(--color-yellow);
  border-color: var(--color-yellow);
}

.event-semester {
  font-family: var(--font-pixel);
  font-size: 0.75rem;
  color: var(--color-blue-pale);
  margin: 0 0 1rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--color-border-soft);
}

.event-meta {
  font-size: 0.8rem;
  color: var(--color-blue-pale);
  margin-bottom: 0.75rem;
}

.event-link {
  display: inline-block;
  margin-top: 0.75rem;
  font-size: 0.85rem;
  color: var(--color-blue-bright);
}

.event-link:hover {
  color: var(--color-yellow);
}


.announcement-list {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.announcement {
  display: flex;
  gap: 1.5rem;
  background-color: var(--color-bg-card);
  border: 2px solid var(--color-blue-dim);
  padding: 1.5rem;
}

.announcement-date {
  flex-shrink: 0;
  width: 100px;
  font-family: var(--font-pixel);
  font-size: 0.75rem;
  color: var(--color-blue-bright);
}

.announcement-body h3 {
  margin-bottom: 0.5rem;
}

.announcement.is-past {
  opacity: 0.75;
}

/* =====================================================
   專案展示（projects.html）
   ===================================================== */
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 1.75rem;
  margin-bottom: 2.5rem;
  padding: 1.5rem;
  background-color: var(--color-bg-card);
  border: 2px solid var(--color-blue-dim);
}

.filter-group {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.filter-group-label {
  font-family: var(--font-pixel);
  font-size: 0.7rem;
  color: var(--color-white-dim);
}

.filter-options {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

.filter-btn {
  font-family: var(--font-body);
  font-size: 0.85rem;
  color: var(--color-white);
  background-color: transparent;
  border: 2px solid var(--color-blue-dim);
  padding: 0.45rem 0.9rem;
  cursor: pointer;
}

.filter-btn:hover {
  border-color: var(--color-blue-bright);
}

.filter-btn.is-active {
  background-color: var(--color-blue-bright);
  border-color: var(--color-blue-bright);
  color: var(--color-bg);
  font-weight: bold;
}

.project-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.75rem;
}

.project-card {
  background-color: var(--color-bg-card);
  border: 2px solid var(--color-blue-dim);
  display: flex;
  flex-direction: row;
  transition: border-color 0.15s ease, transform 0.15s ease;
}

.project-card:hover {
  border-color: var(--color-blue-bright);
  transform: translateY(-3px);
}

.project-card.is-hidden {
  display: none;
}

.project-thumb {
  flex: 0 0 42%;
  background-color: var(--color-bg-alt);
  background-image:
    repeating-linear-gradient(45deg, var(--color-blue-dim) 0, var(--color-blue-dim) 2px, transparent 2px, transparent 14px),
    repeating-linear-gradient(-45deg, var(--color-blue-dim) 0, var(--color-blue-dim) 2px, transparent 2px, transparent 14px);
  display: flex;
  align-items: center;
  justify-content: center;
  border-right: 2px solid var(--color-blue-dim);
  overflow: hidden;
}

.project-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.project-thumb span {
  font-family: var(--font-pixel);
  font-size: 0.7rem;
  color: var(--color-white-dim);
  background-color: rgba(12, 31, 51, 0.75);
  padding: 0.5rem 0.75rem;
}

.project-body {
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.project-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-bottom: 0.75rem;
}

.tag {
  font-size: 0.7rem;
  color: var(--color-blue-bright);
  border: 1px solid var(--color-blue-bright);
  padding: 0.15rem 0.5rem;
}

.tag--workshop {
  color: var(--color-yellow);
  border-color: var(--color-yellow);
}

.badge-status {
  font-size: 0.7rem;
  padding: 0.15rem 0.5rem;
  font-weight: bold;
}

.badge-status.status-ongoing {
  color: var(--color-bg);
  background-color: var(--color-yellow);
}

.badge-status.status-done {
  color: var(--color-white);
  background-color: var(--color-blue-dim);
}

.project-style {
  font-size: 0.85rem;
  color: var(--color-white-dim);
  margin-bottom: 0.5rem;
}

.project-team {
  font-size: 0.8rem;
  color: var(--color-blue-bright);
  margin-bottom: 1rem;
}

.project-links {
  margin-top: auto;
  display: flex;
  gap: 1rem;
}

.no-results {
  text-align: center;
  color: var(--color-white-dim);
  padding: 3rem 0;
  display: none;
}

.no-results.is-visible {
  display: block;
}

/* =====================================================
   首頁精選專案預覽
   ===================================================== */
.featured-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.75rem;
}

/* =====================================================
   Footer
   ===================================================== */
.site-footer {
  border-top: 2px solid var(--color-blue-dim);
  padding: 2.5rem 0;
  margin-top: 3rem;
}

.footer-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
  text-align: center;
}

.footer-logo {
  font-family: var(--font-pixel);
  color: var(--color-yellow);
  font-size: 0.85rem;
  margin: 0;
}

.footer-links {
  display: flex;
  gap: 1.5rem;
}

.footer-copy {
  color: var(--color-white-dim);
  font-size: 0.8rem;
  margin: 0;
}

/* =====================================================
   響應式設計
   ===================================================== */
@media (max-width: 768px) {
  .nav-toggle {
    display: flex;
  }

  .nav-social {
    display: none;
  }

  .site-nav {
    position: absolute;
    top: var(--header-height);
    left: 0;
    right: 0;
    background-color: var(--color-bg);
    border-bottom: 2px solid var(--color-blue-dim);
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.25s ease;
  }

  .site-nav.is-open {
    max-height: 360px;
  }

  .site-nav .nav-list {
    flex-direction: column;
    gap: 0;
    padding: 0.5rem 1.5rem 1.5rem;
  }

  .site-nav .nav-list a {
    display: block;
    padding: 0.75rem 0;
  }

  .hero-title {
    font-size: 1.4rem;
  }

  .announcement {
    flex-direction: column;
    gap: 0.5rem;
  }

  .project-card {
    flex-direction: column;
  }

  .project-thumb {
    flex: none;
    aspect-ratio: 16 / 9;
    border-right: none;
    border-bottom: 2px solid var(--color-blue-dim);
  }
}

@media (max-width: 480px) {
  h1 { font-size: 1.2rem; }
  .hero { padding: 3.5rem 0 3rem; }
}