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

:root {
    --card-bg: rgba(20, 18, 40, 0.82);
    --card-border: rgba(255,255,255,0.08);
    --text-primary: #f0eeff;
    --text-secondary: #a0a0c0;
    --accent-cyan: #00e5ff;
    --accent-pink: #ff6ef7;
    --accent-yellow: #ffe066;
    --accent-green: #7effc4;
    --accent-blue: #7eb8ff;
}

html { scroll-behavior: smooth; }

body {
    font-family: 'Noto Sans SC', sans-serif;
    background: #0d0b1e;
    color: var(--text-primary);
    min-height: 100vh;
    position: relative;
    overflow-x: hidden;
}

body::before {
    content: '';
    position: fixed;
    inset: 0;
    background:
        radial-gradient(ellipse at 20% 30%, rgba(120, 80, 200, 0.18) 0%, transparent 60%),
        radial-gradient(ellipse at 80% 70%, rgba(0, 200, 255, 0.10) 0%, transparent 60%),
        linear-gradient(160deg, #0d0b1e 0%, #1a1235 50%, #0d1a2e 100%);
    z-index: 0;
}

body::after {
    content: '';
    position: fixed;
    inset: 0;
    background-image:
        linear-gradient(rgba(255,255,255,0.02) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255,255,255,0.02) 1px, transparent 1px);
    background-size: 40px 40px;
    z-index: 0;
    pointer-events: none;
}

header, .container, footer { position: relative; z-index: 1; }

/* ===== Header ===== */
header {
    padding: 50px 20px 30px;
    text-align: center;
}

.site-title {
    font-family: 'Orbitron', sans-serif;
    font-size: 1em;
    letter-spacing: 0.4em;
    color: var(--text-secondary);
    text-transform: uppercase;
    margin-bottom: 14px;
}

.page-heading {
    font-size: 2.4em;
    font-weight: 700;
    background: linear-gradient(90deg, var(--accent-cyan), var(--accent-pink));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 10px;
    letter-spacing: 0.05em;
}

.page-subtitle {
    color: var(--text-secondary);
    font-size: 0.95em;
    letter-spacing: 0.15em;
}

/* ===== 分隔线 ===== */
.section-divider {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
    margin: 36px 0 28px;
    color: var(--text-secondary);
    font-size: 0.85em;
    letter-spacing: 0.3em;
    text-transform: uppercase;
}

.section-divider::before,
.section-divider::after {
    content: '';
    flex: 1;
    max-width: 120px;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2));
}

.section-divider::after {
    background: linear-gradient(90deg, rgba(255,255,255,0.2), transparent);
}

/* ===== 容器 ===== */
.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 16px 60px;
}

/* ===== 搜索和筛选 ===== */
.controls {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-bottom: 28px;
}

.search-input {
    width: 100%;
    padding: 14px 20px;
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 12px;
    color: var(--text-primary);
    font-size: 0.95em;
    font-family: 'Noto Sans SC', sans-serif;
    transition: border 0.3s;
    backdrop-filter: blur(10px);
}

.search-input::placeholder { color: var(--text-secondary); }

.search-input:focus {
    outline: none;
    border-color: var(--accent-cyan);
    box-shadow: 0 0 15px rgba(0, 229, 255, 0.15);
}

/* 时间筛选行 */
.time-filters {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.time-select {
    flex: 1;
    min-width: 130px;
    padding: 10px 16px;
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 10px;
    color: var(--text-primary);
    font-size: 0.88em;
    font-family: 'Noto Sans SC', sans-serif;
    cursor: pointer;
    backdrop-filter: blur(10px);
    transition: border 0.3s;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%23a0a0c0' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
    padding-right: 32px;
}

.time-select:focus {
    outline: none;
    border-color: var(--accent-cyan);
}

.time-select option {
    background: #1a1235;
    color: var(--text-primary);
}

/* 分类按钮 */
.category-filters {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.cat-btn {
    padding: 8px 16px;
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 20px;
    color: var(--text-secondary);
    font-size: 0.82em;
    font-family: 'Noto Sans SC', sans-serif;
    cursor: pointer;
    transition: all 0.25s ease;
    backdrop-filter: blur(10px);
}

.cat-btn:hover { border-color: rgba(255,255,255,0.25); color: var(--text-primary); }
.cat-btn.active-all    { border-color: var(--accent-cyan);   color: var(--accent-cyan); }
.cat-btn.active-pink   { border-color: var(--accent-pink);   color: var(--accent-pink); }
.cat-btn.active-yellow { border-color: var(--accent-yellow); color: var(--accent-yellow); }
.cat-btn.active-green  { border-color: var(--accent-green);  color: var(--accent-green); }
.cat-btn.active-blue   { border-color: var(--accent-blue);   color: var(--accent-blue); }
.cat-btn.active-cyan   { border-color: var(--accent-cyan);   color: var(--accent-cyan); }

/* 结果统计 */
.result-count {
    font-size: 0.82em;
    color: var(--text-secondary);
    margin-bottom: 16px;
    letter-spacing: 0.05em;
}

/* ===== 回到主页按钮 ===== */
.home-return-btn {
    position: fixed;
    top: 24px;
    right: 28px;
    z-index: 9999;

    display: inline-flex;
    align-items: center;
    gap: 8px;

    padding: 10px 16px;
    border-radius: 999px;

    text-decoration: none;
    font-family: 'Orbitron', 'Noto Sans SC', sans-serif;
    font-size: 13px;
    letter-spacing: 1.5px;

    color: #dffaff;
    background: rgba(8, 10, 28, 0.55);
    border: 1px solid rgba(0, 229, 255, 0.45);

    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);

    box-shadow:
        0 0 18px rgba(0, 229, 255, 0.28),
        inset 0 0 16px rgba(255, 110, 180, 0.10);

    transition: all 0.25s ease;
}

.home-return-arrow {
    font-size: 18px;
    color: #8ff6ff;
    text-shadow: 0 0 10px rgba(0, 229, 255, 0.8);
    transition: all 0.25s ease;
}

.home-return-text {
    color: rgba(255, 255, 255, 0.88);
}

.home-return-btn:hover {
    transform: translateY(-2px);
    color: #fff;
    border-color: rgba(255, 110, 180, 0.65);
    box-shadow:
        0 0 24px rgba(255, 110, 180, 0.32),
        0 0 36px rgba(0, 229, 255, 0.20),
        inset 0 0 18px rgba(0, 229, 255, 0.12);
}

.home-return-btn:hover .home-return-arrow {
    color: #ff9de2;
    transform: translate(-2px, -2px);
    text-shadow: 0 0 12px rgba(255, 110, 180, 0.9);
}

.home-return-arrow {
    width: 22px;
    height: 22px;
    color: #8ff6ff;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    filter: drop-shadow(0 0 8px rgba(0, 229, 255, 0.85));
    transition: all 0.25s ease;
}

.home-arrow-icon {
    width: 22px;
    height: 22px;
    display: block;
}

.home-return-btn:hover .home-return-arrow {
    color: #ff9de2;
    transform: translate(-2px, -2px);
    filter: drop-shadow(0 0 10px rgba(255, 110, 180, 0.9));
}

@media (max-width: 600px) {
    .home-return-btn {
        top: 16px;
        right: 16px;
        padding: 9px 12px;
        font-size: 11px;
    }

    .home-return-text {
        display: none;
    }

    .home-return-arrow {
        font-size: 20px;
    }
}

/* ===== 公告卡片 ===== */
.announcements-list {
    display: flex;
    flex-direction: column;
    gap: 14px;
}

.announcement-images {
  margin-top: 12px;
}

.announcement-img {
  width: 100%;
  max-width: 100%;
  border-radius: 14px;
  display: block;
  object-fit: cover;
  margin-top: 10px;
}

.extra-images {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.hidden {
  display: none;
}

.announcement-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 14px;
  gap: 12px;
}

.announcement-date {
  color: #c7d8ff;
  font-weight: 600;
}

.expand-images-btn {
  border: none;
  background: rgba(100, 180, 255, 0.16);
  color: #cfeaff;
  padding: 6px 12px;
  border-radius: 999px;
  cursor: pointer;
  font-size: 13px;
  transition: 0.2s ease;
}

.expand-images-btn:hover {
  background: rgba(100, 180, 255, 0.28);
  transform: translateY(-1px);
}

.announcement-card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 14px;
    padding: 20px 22px;
    backdrop-filter: blur(12px);
    transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
    cursor: pointer;
    position: relative;
    overflow: hidden;
    animation: fadeInUp 0.5s ease backwards;
}

.announcement-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 40px rgba(0,0,0,0.4);
    border-color: rgba(255,255,255,0.18);
}

.card-number {
    font-family: 'Orbitron', sans-serif;
    font-size: 0.7em;
    color: var(--text-secondary);
    margin-bottom: 6px;
    letter-spacing: 0.1em;
}

.card-title {
    font-size: 1.05em;
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: 10px;
    line-height: 1.5;
}

.card-content {
    font-size: 0.9em;
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 10px;
    padding: 8px 0;
}

.card-title.cyan   { color: var(--accent-cyan); }
.card-title.pink   { color: var(--accent-pink); }
.card-title.yellow { color: var(--accent-yellow); }
.card-title.green  { color: var(--accent-green); }
.card-title.blue   { color: var(--accent-blue); }

.card-divider {
    height: 1px;
    background: rgba(255,255,255,0.08);
    margin: 10px 0;
}

.card-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.82em;
    color: var(--text-secondary);
}

.card-date { letter-spacing: 0.05em; }

.card-category {
    font-size: 0.78em;
    padding: 3px 10px;
    border-radius: 20px;
    border: 1px solid rgba(255,255,255,0.1);
    background: rgba(255,255,255,0.05);
}

/* 左边发光竖条 */
.announcement-card::before {
    content: '';
    position: absolute;
    left: 0; top: 0; bottom: 0;
    width: 3px;
    border-radius: 14px 0 0 14px;
    background: var(--accent-cyan);
}

.announcement-card.pink::before   { background: var(--accent-pink); }
.announcement-card.yellow::before { background: var(--accent-yellow); }
.announcement-card.green::before  { background: var(--accent-green); }
.announcement-card.blue::before   { background: var(--accent-blue); }

/* ===== 空 / 加载 / 错误 ===== */
.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--text-secondary);
}

.empty-icon { font-size: 3em; margin-bottom: 16px; }

.loading {
    text-align: center;
    padding: 60px;
    color: var(--text-secondary);
}

.spinner {
    display: inline-block;
    width: 28px; height: 28px;
    border: 3px solid rgba(255,255,255,0.1);
    border-top-color: var(--accent-cyan);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin-bottom: 16px;
}

@keyframes spin { to { transform: rotate(360deg); } }

@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(16px); }
    to   { opacity: 1; transform: translateY(0); }
}

.error-box {
    background: rgba(255, 80, 80, 0.1);
    border: 1px solid rgba(255, 80, 80, 0.3);
    border-radius: 12px;
    padding: 16px 20px;
    color: #ff8080;
    margin-bottom: 20px;
    display: none;
}

.error-box.show { display: block; }

/* ===== Footer ===== */
footer {
    text-align: center;
    padding: 30px 20px;
    color: var(--text-secondary);
    font-size: 0.82em;
    letter-spacing: 0.08em;
    position: relative;
    z-index: 1;
}

/* ===== 响应式 ===== */
@media (max-width: 600px) {
    .page-heading { font-size: 1.7em; }
    .announcement-card { padding: 16px 18px; }
    .card-title { font-size: 0.98em; }
    .time-filters { flex-direction: column; }
}

/* ===== 回到主页按钮：纯 CSS 圆滑箭头版 ===== */
.home-return-btn {
    position: fixed;
    top: 24px;
    right: 28px;
    z-index: 9999;

    display: inline-flex;
    align-items: center;
    gap: 9px;

    padding: 10px 16px;
    border-radius: 999px;

    text-decoration: none;
    font-family: 'Orbitron', 'Noto Sans SC', sans-serif;
    font-size: 13px;
    letter-spacing: 1.5px;

    color: #8ff6ff;
    background: rgba(8, 10, 28, 0.58);
    border: 1px solid rgba(0, 229, 255, 0.45);

    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);

    box-shadow:
        0 0 18px rgba(0, 229, 255, 0.28),
        inset 0 0 16px rgba(255, 110, 180, 0.10);

    transition: all 0.25s ease;
}

.soft-arrow {
    position: relative;
    width: 22px;
    height: 22px;
    display: inline-block;
    flex: 0 0 22px;
    color: currentColor;
    filter: drop-shadow(0 0 8px rgba(0, 229, 255, 0.85));
    transition: all 0.25s ease;
}

/* 箭头斜线 */
.soft-arrow::before {
    content: "";
    position: absolute;
    width: 18px;
    height: 3px;
    left: 3px;
    top: 10px;
    background: currentColor;
    border-radius: 999px;
    transform: rotate(-45deg);
}

/* 箭头头部 */
.soft-arrow::after {
    content: "";
    position: absolute;
    width: 9px;
    height: 9px;
    left: 3px;
    top: 3px;
    border-left: 3px solid currentColor;
    border-top: 3px solid currentColor;
    border-radius: 3px 0 0 0;
}

.home-return-text {
    color: rgba(255, 255, 255, 0.88);
}

.home-return-btn:hover {
    color: #ff9de2;
    transform: translateY(-2px);
    border-color: rgba(255, 110, 180, 0.65);
    box-shadow:
        0 0 24px rgba(255, 110, 180, 0.32),
        0 0 36px rgba(0, 229, 255, 0.20),
        inset 0 0 18px rgba(0, 229, 255, 0.12);
}

.home-return-btn:hover .soft-arrow {
    transform: translate(-2px, -2px);
    filter: drop-shadow(0 0 10px rgba(255, 110, 180, 0.9));
}

@media (max-width: 600px) {
    .home-return-btn {
        top: 16px;
        right: 16px;
        padding: 9px 12px;
        font-size: 11px;
    }

    .home-return-text {
        display: none;
    }
}