:root {
    --color-bg: #f4f5f7;
    --color-header-bg: #14181f;
    --color-header-text: #f4f5f7;
    --color-accent: #d0342c;
    --color-text: #1b1e24;
    --color-muted: #6b7280;
    --color-card-bg: #ffffff;
    --color-border: #e2e4e9;
    --viewer-bg: #0e0f12;
    --header-height: 56px;
    --strip-height: 48px;
}

* { box-sizing: border-box; }

html, body {
    margin: 0;
    padding: 0;
    background: var(--color-bg);
    color: var(--color-text);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

a { color: inherit; text-decoration: none; }

/* ---------- Header ---------- */
.site-header {
    position: sticky;
    top: 0;
    z-index: 50;
    background: var(--color-header-bg);
    color: var(--color-header-text);
    height: var(--header-height);
    display: flex;
    align-items: center;
}
.site-header-inner {
    width: 100%;
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 16px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    overflow: hidden;
}
.brand {
    font-weight: 700;
    font-size: 1.05rem;
    white-space: nowrap;
    color: var(--color-header-text);
}
.breadcrumb {
    font-size: 0.85rem;
    color: #b7bcc6;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.breadcrumb a { color: #b7bcc6; }
.breadcrumb a:hover { color: #fff; text-decoration: underline; }
.crumb-sep { margin: 0 6px; color: #565c6a; }
.crumb-current { color: #fff; font-weight: 600; }

/* ---------- Footer ---------- */
.site-footer {
    background: var(--color-header-bg);
    color: #b7bcc6;
    margin-top: 32px;
}
.site-footer-inner {
    max-width: 1100px;
    margin: 0 auto;
    padding: 16px;
    font-size: 0.8rem;
    text-align: center;
}

/* ---------- Home page ---------- */
.home-main {
    max-width: 1100px;
    margin: 0 auto;
    padding: 20px 16px 40px;
}
.section-title {
    font-size: 1.3rem;
    margin: 8px 0 20px;
}
.empty-state {
    color: var(--color-muted);
    text-align: center;
    padding: 40px 0;
}
.epaper-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
}
@media (min-width: 560px) {
    .epaper-grid { grid-template-columns: repeat(3, 1fr); }
}
@media (min-width: 820px) {
    .epaper-grid { grid-template-columns: repeat(4, 1fr); }
}
@media (min-width: 1080px) {
    .epaper-grid { grid-template-columns: repeat(5, 1fr); }
}
.epaper-card {
    background: var(--color-card-bg);
    border: 1px solid var(--color-border);
    border-radius: 10px;
    overflow: hidden;
    display: block;
    transition: transform 0.15s ease, box-shadow 0.15s ease;
}
.epaper-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 18px rgba(0,0,0,0.08);
}
.epaper-thumb {
    background: #dfe1e6;
    aspect-ratio: 3 / 4;
    overflow: hidden;
}
.epaper-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}
.epaper-date {
    padding: 10px 12px;
    font-size: 0.85rem;
    font-weight: 600;
    text-align: center;
    border-top: 1px solid var(--color-border);
}

/* ---------- Reader page ---------- */
.reader-main {
    max-width: 900px;
    margin: 0 auto;
    padding-bottom: 24px;
}

.page-strip {
    position: sticky;
    top: var(--header-height);
    z-index: 40;
    height: var(--strip-height);
    display: flex;
    align-items: center;
    gap: 6px;
    overflow-x: auto;
    background: #fff;
    border-bottom: 1px solid var(--color-border);
    padding: 0 10px;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: thin;
}
.page-strip::-webkit-scrollbar { height: 4px; }
.page-strip-btn {
    flex: 0 0 auto;
    min-width: 34px;
    height: 30px;
    padding: 0 8px;
    border-radius: 6px;
    border: 1px solid var(--color-border);
    background: #fff;
    color: var(--color-text);
    font-size: 0.8rem;
    font-weight: 600;
    cursor: pointer;
}
.page-strip-btn.active {
    background: var(--color-accent);
    border-color: var(--color-accent);
    color: #fff;
}

.viewer {
    position: relative;
    background: var(--viewer-bg);
    min-height: 60vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    touch-action: pan-y;
}
.viewer-image-wrap {
    position: relative;
    width: 100%;
    display: flex;
    justify-content: center;
    cursor: zoom-in;
}
.page-image {
    max-width: 100%;
    max-height: 82vh;
    display: block;
    -webkit-user-select: none;
    user-select: none;
    -webkit-touch-callout: none;
}
.viewer-loading {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: #cfd2d9;
    font-size: 0.85rem;
    display: none;
}
.viewer-loading.visible { display: block; }

.nav-arrow {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    z-index: 20;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    border: none;
    background: rgba(255,255,255,0.15);
    color: #fff;
    font-size: 1.1rem;
    cursor: pointer;
    backdrop-filter: blur(2px);
}
.nav-arrow:hover { background: rgba(255,255,255,0.3); }
.nav-arrow-left { left: 10px; }
.nav-arrow-right { right: 10px; }
.nav-arrow:disabled { opacity: 0.25; cursor: default; }

.tap-hint {
    text-align: center;
    color: var(--color-muted);
    font-size: 0.78rem;
    margin: 10px 0 0;
}

/* ---------- Zoom modal ---------- */
.zoom-modal {
    position: fixed;
    inset: 0;
    background: #000;
    z-index: 100;
    display: none;
    flex-direction: column;
}
.zoom-modal.open { display: flex; }
.zoom-stage {
    flex: 1;
    overflow: hidden;
    position: relative;
    touch-action: none;
}
.zoom-image {
    position: absolute;
    top: 0;
    left: 0;
    transform-origin: 0 0;
    -webkit-user-select: none;
    user-select: none;
    -webkit-touch-callout: none;
    max-width: none;
}
.zoom-close {
    position: absolute;
    top: 10px;
    right: 14px;
    z-index: 110;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    border: none;
    background: rgba(255,255,255,0.15);
    color: #fff;
    font-size: 1.5rem;
    line-height: 1;
    cursor: pointer;
}
.zoom-hint {
    position: absolute;
    bottom: 12px;
    left: 0;
    right: 0;
    text-align: center;
    color: rgba(255,255,255,0.6);
    font-size: 0.75rem;
    pointer-events: none;
}

@media (min-width: 700px) {
    .nav-arrow { width: 52px; height: 52px; font-size: 1.3rem; }
    .viewer { min-height: 75vh; }
}