:root,
html[data-theme="dark"] {
    color-scheme: dark;
    --hc-bg: #12161b;
    --hc-bg-top: #1b242d;
    --hc-bg-bottom: #0d1014;
    --hc-surface: #1a2027;
    --hc-surface-raised: #242c35;
    --hc-text: #eef2f6;
    --hc-muted: #aeb8c4;
    --hc-border: #394653;
    --hc-input: #14191f;
    --hc-button-bg: #d7dde4;
    --hc-button-text: #12171d;
    --hc-shadow: 0 16px 38px rgba(0, 0, 0, 0.34);
}

html[data-theme="light"] {
    color-scheme: light;
    --hc-bg: #d9dee4;
    --hc-bg-top: #eef1f4;
    --hc-bg-bottom: #c8ced6;
    --hc-surface: #f4f6f8;
    --hc-surface-raised: #e8edf2;
    --hc-text: #151a20;
    --hc-muted: #58636f;
    --hc-border: #aab4bf;
    --hc-input: #fbfcfd;
    --hc-button-bg: #242b33;
    --hc-button-text: #f4f7fa;
    --hc-shadow: 0 14px 32px rgba(24, 32, 40, 0.14);
}

html {
    background: linear-gradient(155deg, var(--hc-bg-top) 0%, var(--hc-bg) 44%, var(--hc-bg-bottom) 100%);
}

* {
    letter-spacing: 0;
}

body {
    background: linear-gradient(155deg, var(--hc-bg-top) 0%, var(--hc-bg) 44%, var(--hc-bg-bottom) 100%) !important;
    background-attachment: fixed !important;
    color: var(--hc-text) !important;
    min-height: 100vh;
}

.container,
.box,
.login-box,
.search-box,
.book-card,
.desc-box,
.empty-box,
.no-result,
.message {
    background: var(--hc-surface) !important;
    color: var(--hc-text) !important;
    border-color: var(--hc-border) !important;
    box-shadow: var(--hc-shadow) !important;
}

.container,
.box,
.login-box,
.search-box,
.book-card,
.desc-box,
.empty-box,
.no-result {
    border: 1px solid var(--hc-border) !important;
    border-radius: 8px !important;
}

.cover-wrap,
.book-card img,
.cover-placeholder {
    background: var(--hc-surface-raised) !important;
    border-color: var(--hc-border) !important;
}

.cover-area img {
    border-color: var(--hc-border) !important;
}

.form-section {
    border-color: var(--hc-border) !important;
}

h1,
h2,
h3,
p,
label,
.book-title,
.book-author,
.book-card h3,
.book-card p,
.meta,
.note,
.no-cover,
.login-box h1,
.login-box p,
.top-links a,
.back-link {
    color: var(--hc-text) !important;
}

.book-author,
.meta,
.note,
.login-box p {
    color: var(--hc-muted) !important;
}

a {
    color: var(--hc-text) !important;
}

input[type="text"],
input[type="password"],
input[type="file"],
textarea {
    background: var(--hc-input) !important;
    color: var(--hc-text) !important;
    border: 1px solid var(--hc-border) !important;
    border-radius: 8px !important;
}

input:focus,
textarea:focus {
    border-color: var(--hc-text) !important;
    outline: 2px solid var(--hc-border);
    outline-offset: 2px;
}

input::placeholder,
textarea::placeholder {
    color: var(--hc-muted);
    opacity: 1;
}

input[type="file"]::file-selector-button {
    background: var(--hc-button-bg);
    color: var(--hc-button-text);
    border: 1px solid var(--hc-button-bg);
    border-radius: 6px;
    padding: 7px 10px;
    margin-right: 10px;
    cursor: pointer;
}

button,
.btn,
a.btn,
.top-bar a,
.top-links a,
.back-link,
.book-card a {
    background: var(--hc-button-bg) !important;
    color: var(--hc-button-text) !important;
    border: 1px solid var(--hc-button-bg) !important;
    border-radius: 8px !important;
    text-decoration: none !important;
}

button:hover,
.btn:hover,
a.btn:hover,
.top-bar a:hover,
.top-links a:hover,
.back-link:hover,
.book-card a:hover {
    background: var(--hc-bg) !important;
    color: var(--hc-text) !important;
    border-color: var(--hc-text) !important;
}

.back-link {
    background: transparent !important;
    color: var(--hc-text) !important;
    border-color: var(--hc-border) !important;
}

.back-link:hover {
    border-color: var(--hc-text) !important;
}

.success,
.error {
    background: var(--hc-surface-raised) !important;
    color: var(--hc-text) !important;
    border: 1px solid var(--hc-border) !important;
}

.book-card {
    overflow: hidden;
}

.book-card:hover {
    border-color: var(--hc-text) !important;
}

.btn-delete {
    background: transparent !important;
    color: var(--hc-text) !important;
    border-color: var(--hc-border) !important;
}

.btn-delete:hover {
    border-color: var(--hc-text) !important;
}

.theme-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    min-width: 88px;
    width: auto !important;
    min-height: 40px;
    padding: 9px 13px;
    background: var(--hc-button-bg) !important;
    color: var(--hc-button-text) !important;
    border: 1px solid var(--hc-button-bg) !important;
    border-radius: 999px !important;
    box-shadow: var(--hc-shadow);
    cursor: pointer;
    font: 700 13px/1 Arial, "Microsoft YaHei", sans-serif;
}

.theme-toggle.is-floating {
    position: fixed;
    top: 18px;
    right: 18px;
    z-index: 9999;
}

.theme-toggle:hover {
    background: var(--hc-bg) !important;
    color: var(--hc-text) !important;
    border-color: var(--hc-text) !important;
}

.theme-toggle__icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 15px;
    height: 15px;
    font-size: 12px;
    line-height: 1;
}

.theme-toggle__label {
    white-space: nowrap;
}

@media (max-width: 600px) {
    .theme-toggle {
        min-width: 76px;
        min-height: 36px;
        padding: 8px 10px;
        font-size: 12px;
    }

    .theme-toggle.is-floating {
        top: 10px;
        right: 10px;
    }
}