:root {
    color-scheme: light;
    --font-ui: 'Manrope', 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;

    --bg: #f4f6f8;
    --bg-layer-1: radial-gradient(circle at 12% 15%, rgba(255, 107, 61, 0.2), transparent 42%);
    --bg-layer-2: radial-gradient(circle at 88% 8%, rgba(0, 167, 194, 0.2), transparent 36%);
    --bg-layer-3: linear-gradient(135deg, #f6f8fb 0%, #eef2f6 45%, #e8edf3 100%);

    --surface: rgba(255, 255, 255, 0.86);
    --surface-strong: #ffffff;
    --surface-soft: rgba(14, 20, 30, 0.04);
    --surface-border: rgba(14, 20, 30, 0.1);

    --text: #0c1420;
    --text-muted: #566073;
    --text-faint: #798497;

    --primary: #0a84ff;
    --primary-hover: #0068d7;
    --primary-glow: rgba(10, 132, 255, 0.26);

    --chip-bg: rgba(14, 20, 30, 0.06);
    --input-bg: rgba(255, 255, 255, 0.88);

    --badge-hidden-bg: rgba(255, 171, 120, 0.32);
    --badge-hidden-text: #8b3f04;
    --badge-system-bg: rgba(135, 231, 183, 0.34);
    --badge-system-text: #0d5f36;
    --badge-limited-bg: rgba(255, 151, 151, 0.34);
    --badge-limited-text: #8b1c1c;

    --radius-xl: 24px;
    --radius-lg: 18px;
    --radius-md: 14px;

    --shadow-card: 0 18px 44px rgba(18, 24, 38, 0.1);
    --shadow-soft: 0 8px 20px rgba(18, 24, 38, 0.08);
}

body[data-theme='dark'] {
    color-scheme: dark;
    --bg: #0d1118;
    --bg-layer-1: radial-gradient(circle at 10% 12%, rgba(255, 122, 66, 0.2), transparent 40%);
    --bg-layer-2: radial-gradient(circle at 86% 2%, rgba(26, 197, 228, 0.16), transparent 38%);
    --bg-layer-3: linear-gradient(140deg, #080b11 0%, #111826 52%, #1c1429 100%);

    --surface: rgba(16, 23, 34, 0.84);
    --surface-strong: rgba(18, 26, 39, 0.94);
    --surface-soft: rgba(255, 255, 255, 0.05);
    --surface-border: rgba(255, 255, 255, 0.14);

    --text: #f3f7ff;
    --text-muted: #b8c3d8;
    --text-faint: #99a5bb;

    --primary: #56a4ff;
    --primary-hover: #7eb9ff;
    --primary-glow: rgba(86, 164, 255, 0.3);

    --chip-bg: rgba(255, 255, 255, 0.09);
    --input-bg: rgba(255, 255, 255, 0.07);

    --badge-hidden-bg: rgba(255, 171, 120, 0.2);
    --badge-hidden-text: #ffd4b3;
    --badge-system-bg: rgba(135, 231, 183, 0.2);
    --badge-system-text: #cbf8df;
    --badge-limited-bg: rgba(255, 151, 151, 0.2);
    --badge-limited-text: #ffd3d3;

    --shadow-card: 0 22px 52px rgba(0, 0, 0, 0.52);
    --shadow-soft: 0 10px 22px rgba(0, 0, 0, 0.35);
}

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

html,
body {
    min-height: 100%;
}

body {
    font-family: var(--font-ui);
    color: var(--text);
    line-height: 1.55;
    background: var(--bg-layer-3);
    padding: 2.8rem 1.2rem;
    transition: color 0.25s ease, background 0.35s ease;
    position: relative;
}

body::before,
body::after {
    content: '';
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: -2;
}

body::before {
    background: var(--bg-layer-1), var(--bg-layer-2);
    opacity: 0.95;
}

body::after {
    z-index: -1;
    background-image: linear-gradient(rgba(255, 255, 255, 0.08) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.08) 1px, transparent 1px);
    background-size: 22px 22px;
    mask-image: radial-gradient(circle at 50% 35%, rgba(0, 0, 0, 0.45), transparent 72%);
    opacity: 0.35;
}

body[data-theme='dark']::after {
    background-image: linear-gradient(rgba(255, 255, 255, 0.06) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.06) 1px, transparent 1px);
    opacity: 0.5;
}

.container {
    width: min(1140px, 100%);
    margin: 0 auto;
}

.header,
.card,
.loading,
.error {
    background: var(--surface);
    border: 1px solid var(--surface-border);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-card);
    backdrop-filter: blur(16px) saturate(140%);
}

.header {
    padding: 2.2rem 2.3rem;
    margin-bottom: 1.7rem;
    position: relative;
    overflow: hidden;
}

.header::after {
    content: '';
    position: absolute;
    inset: auto -40px -80px auto;
    width: 220px;
    height: 220px;
    border-radius: 999px;
    background: radial-gradient(circle, var(--primary-glow) 0%, transparent 70%);
    pointer-events: none;
}

.header-top {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.9rem;
    flex-wrap: wrap;
}

.brand {
    display: flex;
    align-items: center;
    gap: 0.85rem;
}

.brand-mark {
    width: 48px;
    height: 48px;
    border-radius: 14px;
    background: #000;
    box-shadow: inset 0 1px 2px rgba(255, 255, 255, 0.12), inset 0 -3px 8px rgba(0, 0, 0, 0.25);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

body[data-theme='dark'] .brand-mark {
    background: #fff;
    box-shadow: inset 0 1px 2px rgba(255, 255, 255, 0.6), inset 0 -3px 8px rgba(0, 0, 0, 0.08);
}

.brand-mark img {
    width: 28px;
    height: 28px;
    filter: brightness(0) invert(1);
}

body[data-theme='dark'] .brand-mark img {
    filter: brightness(0);
}

.brand-meta {
    font-weight: 700;
    font-size: 1.08rem;
    letter-spacing: 0.01em;
}

.brand-label {
    color: var(--text-muted);
    font-size: 0.92rem;
}

.theme-toggle {
    display: inline-flex;
    align-items: center;
    gap: 0.65rem;
    border-radius: 999px;
    border: 1px solid var(--surface-border);
    background: var(--surface-strong);
    color: var(--text);
    padding: 0.5rem 0.95rem;
    cursor: pointer;
    transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

.theme-toggle:hover {
    transform: translateY(-1px);
    border-color: var(--primary);
    box-shadow: 0 0 0 3px var(--primary-glow);
}

.theme-toggle .toggle-icon {
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
}

.theme-toggle svg {
    width: 18px;
    height: 18px;
    stroke: currentColor;
    opacity: 0.45;
    transition: opacity 0.25s ease;
}

.theme-toggle.is-dark .icon-moon,
.theme-toggle:not(.is-dark) .icon-sun {
    opacity: 1;
}

.theme-toggle-text {
    font-size: 0.88rem;
    font-weight: 700;
}

.header-main {
    margin-top: 1.2rem;
}

.header-main h1 {
    font-size: clamp(1.9rem, 4vw, 2.75rem);
    font-weight: 800;
    letter-spacing: 0.01em;
    margin-bottom: 0.55rem;
}

.header-main p {
    color: var(--text-muted);
    max-width: 760px;
    margin-bottom: 1rem;
}

.meta-row {
    display: flex;
    flex-wrap: wrap;
    gap: 0.55rem;
}

.meta-chip {
    padding: 0.38rem 0.84rem;
    border-radius: 999px;
    font-size: 0.82rem;
    border: 1px solid transparent;
    background: var(--chip-bg);
    color: var(--text-muted);
}

.meta-chip a {
    color: inherit;
    text-decoration: none;
}

.meta-chip:hover {
    border-color: var(--surface-border);
}

.meta-chip a:hover {
    text-decoration: underline;
}

.card {
    padding: 1.6rem;
    margin-bottom: 1.2rem;
}

.card-content {
    padding: 1.9rem;
}

.info-block h3 {
    font-size: 1.22rem;
    margin-bottom: 1.1rem;
}

.toolbar {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-bottom: 1.2rem;
}

.search-box {
    width: 100%;
    border: 1px solid var(--surface-border);
    background: var(--input-bg);
    color: var(--text);
    border-radius: 999px;
    padding: 0.8rem 1.15rem;
    font-size: 0.96rem;
    outline: none;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.search-box::placeholder {
    color: var(--text-faint);
}

.search-box:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px var(--primary-glow);
}

.filter-section {
    display: flex;
    flex-wrap: wrap;
    gap: 0.55rem;
}

.btn {
    border: 1px solid transparent;
    border-radius: 999px;
    cursor: pointer;
    transition: transform 0.2s ease, background 0.2s ease, box-shadow 0.2s ease;
    font-family: inherit;
}

.btn-filter {
    background: var(--chip-bg);
    color: var(--text-muted);
    padding: 0.48rem 0.95rem;
    font-size: 0.88rem;
    font-weight: 600;
}

.btn-filter:hover {
    transform: translateY(-1px);
    color: var(--text);
}

.btn-filter.active {
    color: #fff;
    border-color: transparent;
    background: linear-gradient(140deg, var(--primary), var(--primary-hover));
    box-shadow: 0 8px 20px var(--primary-glow);
}

.time-limited-board {
    margin-bottom: 1rem;
    border-radius: 14px;
    border: 1px solid var(--surface-border);
    background: var(--surface-strong);
    overflow: hidden;
}

#timeLimitedNotice {
    margin-bottom: 0.9rem;
}

#timeLimitedNotice.hidden {
    display: none !important;
}

.time-limited-board-title {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.5rem;
    padding: 0.7rem 0.85rem;
    font-size: 0.9rem;
    font-weight: 700;
    color: var(--badge-limited-text);
    background: var(--badge-limited-bg);
}

.time-limited-count {
    min-width: 1.5rem;
    height: 1.5rem;
    border-radius: 999px;
    padding: 0 0.45rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 0.78rem;
    color: #fff;
    background: var(--badge-limited-text);
}

.time-limited-list {
    display: grid;
    gap: 0.45rem;
    padding: 0.65rem;
}

.time-limited-item {
    border: 1px solid var(--surface-border);
    border-radius: 10px;
    background: var(--surface);
    padding: 0.55rem 0.65rem;
}

.time-limited-item-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.6rem;
    flex-wrap: wrap;
}

.time-limited-name {
    font-size: 0.88rem;
    font-weight: 600;
    color: var(--text);
    line-height: 1.35;
}

.time-limited-date {
    margin-top: 0.28rem;
    font-size: 0.78rem;
    color: var(--text-faint);
}

.time-limited-status {
    flex-shrink: 0;
    border-radius: 999px;
    border: 1px solid var(--surface-border);
    font-size: 0.72rem;
    padding: 0.1rem 0.45rem;
    color: var(--text-muted);
    background: var(--chip-bg);
}

.time-limited-status.is-active {
    color: #0f7a44;
    background: rgba(126, 227, 175, 0.28);
    border-color: rgba(126, 227, 175, 0.5);
}

.time-limited-status.is-upcoming {
    color: #0f4fa3;
    background: rgba(122, 181, 255, 0.28);
    border-color: rgba(122, 181, 255, 0.5);
}

.time-limited-status.is-ended {
    color: #8b4a1d;
    background: rgba(255, 191, 135, 0.3);
    border-color: rgba(255, 191, 135, 0.55);
}

/* backward compatibility for previous markup */
.time-limited-notice {
    display: inline-flex;
    align-items: center;
    gap: 0.45rem;
    margin-bottom: 0.5rem;
    padding: 0.5rem 0.75rem;
    border-radius: 10px;
    background: var(--badge-limited-bg);
    color: var(--badge-limited-text);
    font-size: 0.86rem;
    font-weight: 600;
}

.time-limited-notice::before {
    content: '';
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: currentColor;
}

.stickers-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: 0.95rem;
}

.sticker-item {
    border: 1px solid var(--surface-border);
    background: var(--surface-strong);
    border-radius: var(--radius-md);
    padding: 0.85rem;
    cursor: pointer;
    transition: transform 0.22s ease, box-shadow 0.22s ease, border-color 0.22s ease;
    box-shadow: var(--shadow-soft);
}

.sticker-item:hover {
    transform: translateY(-4px);
    border-color: var(--primary);
    box-shadow: 0 14px 24px rgba(10, 132, 255, 0.18);
}

.sticker-image-container {
    width: 100%;
    aspect-ratio: 1 / 1;
    border-radius: 12px;
    border: 1px dashed var(--surface-border);
    background: var(--surface-soft);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    margin-bottom: 0.68rem;
}

.sticker-image {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

.sticker-image-placeholder {
    font-size: 0.8rem;
    color: var(--text-faint);
}

.sticker-name {
    font-size: 0.88rem;
    font-weight: 700;
    color: var(--text);
    text-align: center;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    margin-bottom: 0.45rem;
}

.sticker-badges,
.modal-badges {
    display: flex;
    gap: 0.35rem;
    flex-wrap: wrap;
    justify-content: center;
}

.badge {
    display: inline-block;
    border-radius: 999px;
    padding: 0.16rem 0.5rem;
    font-size: 0.7rem;
    font-weight: 700;
}

.badge-hidden {
    background: var(--badge-hidden-bg);
    color: var(--badge-hidden-text);
}

.badge-system {
    background: var(--badge-system-bg);
    color: var(--badge-system-text);
}

.badge-limited {
    background: var(--badge-limited-bg);
    color: var(--badge-limited-text);
}

.upload-area {
    border: 1px dashed var(--surface-border);
    border-radius: var(--radius-lg);
    background: var(--surface-strong);
    text-align: center;
    padding: 2.2rem 1.2rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.75rem;
    transition: border-color 0.2s ease, transform 0.2s ease, box-shadow 0.2s ease;
}

.upload-area:hover,
.upload-area.dragover {
    border-color: var(--primary);
    transform: translateY(-2px);
    box-shadow: 0 10px 24px rgba(10, 132, 255, 0.15);
}

.upload-icon {
    width: 58px;
    height: 58px;
    border-radius: 16px;
    display: grid;
    place-items: center;
    background: linear-gradient(140deg, var(--primary), var(--primary-hover));
}

.upload-icon svg {
    width: 30px;
    height: 30px;
    stroke: #fff;
}

.upload-title {
    font-size: 1.14rem;
    font-weight: 700;
}

.upload-desc,
.upload-hint {
    color: var(--text-muted);
}

input[type='file'] {
    display: none;
}

.btn-primary {
    background: linear-gradient(140deg, var(--primary), var(--primary-hover));
    color: #fff;
    padding: 0.68rem 1.28rem;
    font-size: 0.93rem;
    font-weight: 700;
    box-shadow: 0 10px 20px var(--primary-glow);
}

.btn-primary:hover {
    transform: translateY(-2px);
}

.stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
    gap: 0.75rem;
}

.stat-item {
    border-radius: 12px;
    border: 1px solid var(--surface-border);
    background: var(--surface-strong);
    text-align: center;
    padding: 0.9rem 0.55rem;
}

.stat-number {
    font-size: 1.55rem;
    font-weight: 800;
    color: var(--primary);
}

.stat-label {
    font-size: 0.82rem;
    color: var(--text-muted);
}

.loading,
.error {
    text-align: center;
    padding: 2.2rem 1rem;
    margin-bottom: 1.2rem;
}

.loading {
    color: var(--primary);
}

.error {
    color: var(--badge-limited-text);
}

.hidden {
    display: none !important;
}

.modal-backdrop {
    display: none;
    position: fixed;
    inset: 0;
    z-index: 1000;
    background: rgba(0, 0, 0, 0.58);
    backdrop-filter: blur(5px);
}

.modal-backdrop.show {
    display: flex;
    align-items: center;
    justify-content: center;
    animation: fadeIn 0.2s ease;
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

.modal-content {
    width: min(510px, 90vw);
    background: var(--surface);
    border: 1px solid var(--surface-border);
    border-radius: 20px;
    box-shadow: var(--shadow-card);
    padding: 2rem 1.6rem 1.4rem;
    text-align: center;
    position: relative;
}

.modal-close {
    position: absolute;
    top: 10px;
    right: 12px;
    width: 34px;
    height: 34px;
    border-radius: 50%;
    line-height: 34px;
    text-align: center;
    font-size: 1.8rem;
    color: var(--text-faint);
    cursor: pointer;
}

.modal-close:hover {
    color: var(--text);
    background: var(--surface-soft);
}

.modal-title {
    font-size: 1.45rem;
    font-weight: 800;
    margin-bottom: 0.7rem;
}

.modal-image {
    width: min(280px, 72vw);
    max-height: 300px;
    object-fit: contain;
    margin: 1rem auto 1.2rem;
    display: block;
}

.download-btn::before {
    content: '';
    width: 9px;
    height: 9px;
    border-left: 2px solid currentColor;
    border-bottom: 2px solid currentColor;
    transform: rotate(-45deg);
    display: inline-block;
    margin-right: 0.45rem;
}

.footer {
    margin-top: 1.6rem;
    text-align: center;
    color: var(--text-muted);
    font-size: 0.84rem;
    border-top: 1px solid var(--surface-border);
    padding: 1.3rem 0.8rem;
}

.footer a {
    color: var(--primary);
    text-decoration: none;
}

.footer a:hover {
    text-decoration: underline;
}

@media (min-width: 768px) {
    .toolbar {
        flex-direction: row;
        justify-content: space-between;
        align-items: center;
    }

    .search-box {
        max-width: 320px;
    }

    .filter-section {
        justify-content: flex-end;
    }
}

@media (max-width: 768px) {
    body {
        padding: 1.3rem 0.82rem;
    }

    .header,
    .card {
        border-radius: 18px;
    }

    .header {
        padding: 1.25rem;
    }

    .header-top {
        flex-direction: column;
        align-items: flex-start;
    }

    .header-main h1 {
        font-size: 1.8rem;
        line-height: 1.2;
    }

    .card {
        padding: 1.15rem;
    }

    .card-content {
        padding: 1.2rem;
    }

    .stickers-grid {
        grid-template-columns: repeat(auto-fill, minmax(112px, 1fr));
        gap: 0.72rem;
    }

    .modal-content {
        padding: 1.4rem 1rem 1rem;
    }
}