:root {
    --color-page-bg: #f5f4f1;
    --color-card-bg: #ffffff;
    --color-header-bg: #203f62;
    --color-heading: #203f62;
    --color-primary: #176b52;
    --color-primary-hover: #105541;
    --color-school-home-bg: #ff9000;
    --color-school-home-hover: #f08000;
    --color-silver: #b7bdc5;
    --color-gold: #8a681e;
    --color-text: #292d32;
    --color-text-muted: #545d66;
    --color-panel-bg: #f6f8fa;
    --page-gutter: 12px;
    --content-padding: 14px;
    --card-padding-y: 24px;
    --card-margin-y: 16px;
}
* { box-sizing: border-box; }
html { background: var(--color-page-bg); }
body {
    isolation: isolate;
    margin: 0;
    background: var(--color-page-bg);
    color: var(--color-text);
    font-family: "Microsoft JhengHei", "Noto Sans TC", Arial, sans-serif;
    font-size: 16px;
    line-height: 1.6;
}
#form1 {
    position: relative;
    z-index: 1;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    min-height: 100svh;
}
.logo-background {
    display: flex;
    position: fixed;
    z-index: 0;
    right: var(--page-gutter);
    bottom: 76px;
    justify-content: flex-end;
    align-items: flex-end;

    pointer-events: none;
}
.logo-background img {
    display: block;
    width: min(35vw, 27.5vh, 350px);
    max-width: 100%;
    height: auto;
    opacity: 0.14;
    mix-blend-mode: multiply;
}
.skip-link {
    position: absolute;
    z-index: 2;
    top: 8px;
    left: 8px;
    min-height: 44px;
    padding: 9px 14px;
    transform: translateY(-160%);
    border-radius: 4px;
    background: var(--color-card-bg);
    color: var(--color-heading);
    font-weight: 700;
}
.skip-link:focus { transform: translateY(0); }
.site-header {
    position: relative;
    z-index: 1;
    border-bottom: 4px solid var(--color-gold);
    background: var(--color-header-bg);
    color: var(--color-card-bg);
}
.brand-row {
    display: flex;
    flex-direction: column;
    gap: 4px 24px;
    padding: 16px var(--content-padding);
}
.school-name, .service-name { margin: 0; line-height: 1.4; }
.school-name { font-size: 18px; font-weight: 700; }
.service-name { font-size: 15px; }
.service-name a { position:relative; color:inherit; text-decoration:none; }
.service-name a::before { content:""; position:absolute; min-height:44px; min-width:44px; inset:50% 0 auto; transform:translateY(-50%); }
.service-name a:hover { text-decoration:underline; text-underline-offset:4px; }
.home-main { position: relative; z-index: 1; display: flow-root; }
.academic-term { margin:16px var(--page-gutter) 0; color:var(--color-heading); font-size:16px; font-weight:700; overflow-wrap:anywhere; }
.google-auth-heading { margin-bottom:16px; padding:16px; border:1px solid #b7bdc5; border-left:4px solid #176b52; border-radius:4px; background:#f6f8fa; overflow-wrap:anywhere; }
.google-auth-provider { margin:0 0 8px; color:#176b52; font-weight:700; }
.google-auth-heading h1 { margin:0 0 12px; color:#203f62; font-size:22px; line-height:1.4; }
.google-auth-summary { margin:0; color:#545d66; font-size:14px; }
.site-footer { position:relative; z-index:1; margin-top:auto; padding:8px var(--page-gutter,12px); background:#f5f4f1; color:#545d66; text-align:center; font-size:14px; overflow-wrap:anywhere; }
.site-footer p { display:flex; flex-wrap:wrap; align-items:center; justify-content:center; column-gap:8px; margin:0; }
.site-footer .footer-admin { white-space:nowrap; }
.site-footer a { display:inline-flex; align-items:center; min-height:44px; color:#0b4f78; text-underline-offset:3px; }
.home-card {
    display: grid;
    width: calc(100% - var(--page-gutter) - var(--page-gutter));
    max-width: none;
    margin: var(--card-margin-y) var(--page-gutter);
    padding: 24px var(--content-padding) var(--card-padding-y);
    border: 2px solid var(--color-silver);
    border-top: 4px solid var(--color-gold);
    border-left: 6px solid var(--color-silver);
    border-radius: 8px;
    background: var(--color-card-bg);
    box-shadow: 0 12px 30px rgba(31, 41, 51, 0.08);
    gap: 16px;
}
.entrance-panel { min-width: 0; }
.page-title {
    margin: 0 0 12px;
    padding-left: 12px;
    border-left: 4px solid var(--color-gold);
    color: var(--color-heading);
    font-size: 20px;
    font-weight: 700;
    line-height: 1.4;
}
.site-address { margin: 0 0 20px; overflow-wrap: anywhere; }
.site-address a { color: #0b4f78; text-underline-offset: 0.15em; }
.site-address a:hover { color: var(--color-primary-hover); }
.entry-actions {
    display: grid;
    grid-template-columns: minmax(0, 1fr);
    gap: 12px;
}
.entry-button {
    display: inline-flex;
    min-height: 44px;
    width: 100%;
    align-items: center;
    justify-content: center;
    min-width: 0;
    text-align: center;
    overflow-wrap: anywhere;
    padding: 10px 18px;
    border-radius: 4px;
    background: var(--color-primary);
    color: var(--color-card-bg);
    font-weight: 700;
    text-decoration: none;
}
.entry-button:hover { background: var(--color-primary-hover); }
.school-home-button { background: var(--color-school-home-bg); color: var(--color-text); }
.school-home-button:hover { background: var(--color-school-home-hover); }
.clock-difference {
    grid-column: 1 / -1;
    margin: 0;
    padding-top: 10px;
    border-top: 1px solid var(--color-silver);
    color: var(--color-text);
    font-size: 15px;
    overflow-wrap: anywhere;
}
.clock-panel {
    display: grid;
    grid-template-columns: minmax(0, 1fr);
    gap: 16px;
    min-width: 0;
    padding: 12px 14px;
    border: 1px solid var(--color-silver);
    border-radius: 8px;
    background: var(--color-panel-bg);
}
.clock-label { margin: 0 0 8px; font-weight: 700; }
.clock-block { min-width: 0; }
.database-clock { padding-top: 12px; border-top: 1px solid var(--color-silver); }
.clock-status { margin: 0; color: var(--color-text-muted); }
.clock-time { display: block; font-variant-numeric: tabular-nums; }
.clock-date { display: block; color: var(--color-text-muted); }
.clock-digits {
    display: block;
    color: var(--color-primary);
    font-size: clamp(28px, 2.4vw, 40px);
    font-weight: 700;
    line-height: 1.5;
}
a:focus-visible, main:focus-visible {
    outline: 3px solid var(--color-primary);
    outline-offset: 3px;
}
@media (min-width: 561px) {
    :root { --page-gutter: 16px; --content-padding: 20px; }
    .brand-row { flex-direction: row; flex-wrap: wrap; align-items: center; justify-content: space-between; }
    .page-title { font-size: 22px; }
    .entry-actions { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (min-width: 821px) {
    :root { --page-gutter: 24px; --content-padding: 30px; }
    .brand-row { padding-top: 24px; padding-bottom: 24px; }
    .home-card { grid-template-columns: minmax(0, 3fr) minmax(0, 2fr); gap: 24px; }
    .entrance-panel {
        display: flex;
        flex-direction: column;
        justify-content: center;
        align-self: stretch;
        padding-right: 24px;
        border-right: 2px solid var(--color-silver);
    }
    .clock-panel { padding: 8px 20px; gap: 8px; }
    .clock-label { margin-bottom: 4px; line-height: 1.4; }
    .clock-date { line-height: 1.4; }
    .clock-digits { line-height: 1.2; }
    .clock-difference { padding-top: 5px; }
}

@media (max-width: 820px) {
    .logo-background { bottom:120px; }
    .entrance-panel { padding-bottom: 16px; border-bottom: 1px solid var(--color-silver); }
}
@media (min-width: 1200px) {
    .clock-panel { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .database-clock { padding-top: 0; padding-left: 16px; border-top: 0; border-left: 1px solid var(--color-silver); }
}