:root {
    --color-bg: #faf6f0;
    --color-surface: #ffffff;
    --color-text: #3a332c;
    --color-text-muted: #83766a;
    --color-accent: #a85c32;
    --color-accent-dark: #8a4a26;
    --color-border: #e7ddd0;
    --font-serif: Georgia, "Iowan Old Style", "Palatino Linotype", serif;
    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    background: var(--color-bg);
    color: var(--color-text);
    font-family: var(--font-sans);
    line-height: 1.5;
}

.hidden {
    display: none !important;
}

/* --- Prihlasovacia obrazovka --- */

#auth-gate {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;
}

.auth-box {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: 12px;
    padding: 40px 32px;
    width: 100%;
    max-width: 360px;
    text-align: center;
}

.auth-title {
    font-family: var(--font-serif);
    font-size: 32px;
    margin: 0 0 4px;
    color: var(--color-accent-dark);
}

.auth-subtitle {
    margin: 0 0 24px;
    color: var(--color-text-muted);
    font-size: 14px;
}

#login-form {
    display: flex;
    flex-direction: column;
    gap: 6px;
    text-align: left;
}

#login-form label {
    font-size: 13px;
    color: var(--color-text-muted);
    margin-top: 8px;
}

#login-form input {
    padding: 10px 12px;
    border: 1px solid var(--color-border);
    border-radius: 8px;
    font-size: 15px;
    background: var(--color-bg);
    color: var(--color-text);
}

#login-form input:focus {
    outline: 2px solid var(--color-accent);
    outline-offset: 1px;
}

#login-form button {
    margin-top: 18px;
    padding: 11px;
    border: none;
    border-radius: 8px;
    background: var(--color-accent);
    color: #fff;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
}

#login-form button:hover {
    background: var(--color-accent-dark);
}

.error-message {
    margin-top: 12px;
    color: #b03434;
    font-size: 13px;
    text-align: center;
}

/* --- Aplikácia --- */

.app-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 18px 24px;
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
}

.app-title {
    font-family: var(--font-serif);
    font-size: 22px;
    margin: 0;
    color: var(--color-accent-dark);
}

.header-right {
    display: flex;
    align-items: center;
    gap: 14px;
    font-size: 14px;
}

.user-email {
    color: var(--color-text-muted);
}

.link-button {
    background: none;
    border: none;
    color: var(--color-accent);
    cursor: pointer;
    font-size: 14px;
    padding: 0;
}

.link-button:hover {
    text-decoration: underline;
}

.section-nav {
    display: flex;
    flex-wrap: wrap;
    gap: 4px;
    max-width: 720px;
    margin: 0 auto;
    padding: 14px 20px 0;
}

.nav-tab {
    background: none;
    border: none;
    border-bottom: 2px solid transparent;
    padding: 8px 12px;
    font-size: 14px;
    color: var(--color-text-muted);
    cursor: pointer;
    font-family: inherit;
}

.nav-tab:hover {
    color: var(--color-text);
}

.nav-tab.active {
    color: var(--color-accent-dark);
    border-bottom-color: var(--color-accent);
    font-weight: 600;
}

main {
    max-width: 720px;
    margin: 0 auto;
    padding: 32px 20px 80px;
}

.section-title {
    font-family: var(--font-serif);
    font-size: 26px;
    margin: 0 0 20px;
}

.list-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
}

.list-header .section-title {
    margin: 0 0 20px;
}

.button-primary {
    padding: 9px 16px;
    border: none;
    border-radius: 8px;
    background: var(--color-accent);
    color: #fff;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    white-space: nowrap;
}

.button-primary:hover {
    background: var(--color-accent-dark);
}

.empty-message {
    color: var(--color-text-muted);
    font-style: italic;
}

/* --- Zoznam kapitol --- */

.chapters-list {
    display: flex;
    flex-direction: column;
    gap: 14px;
}

.chapter-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: 10px;
    padding: 18px 20px;
    cursor: pointer;
    text-align: left;
    width: 100%;
    font-family: inherit;
}

.chapter-card:hover {
    border-color: var(--color-accent);
}

.chapter-card-locked {
    cursor: default;
    opacity: 0.65;
    background: var(--color-bg);
}

.chapter-card-locked:hover {
    border-color: var(--color-border);
}

.chapter-card-title {
    font-family: var(--font-serif);
    font-size: 19px;
    margin: 0 0 4px;
}

.chapter-card-date {
    font-size: 13px;
    color: var(--color-text-muted);
    margin: 0 0 8px;
}

.chapter-card-excerpt {
    font-size: 14px;
    color: var(--color-text);
    margin: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
}

/* --- Detail kapitoly --- */

.back-button {
    margin-bottom: 20px;
    display: inline-block;
}

.chapter-detail-title {
    font-family: var(--font-serif);
    font-size: 30px;
    margin: 0 0 6px;
}

.chapter-detail-meta {
    font-size: 14px;
    color: var(--color-text-muted);
    margin: 0 0 24px;
}

.chapter-detail-meta span + span::before {
    content: "·";
    margin: 0 6px;
}

.chapter-detail-body {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: 10px;
    padding: 24px;
    font-size: 16px;
}

.chapter-detail-body p:first-child {
    margin-top: 0;
}

.media-grid {
    margin-top: 24px;
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
    gap: 10px;
}

.media-item {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.media-item img,
.media-item video {
    width: 100%;
    height: 140px;
    object-fit: cover;
    border-radius: 8px;
    border: 1px solid var(--color-border);
}

.media-item-media[data-full-url] {
    cursor: zoom-in;
}

.media-item-media[data-full-url]:hover img,
.media-item-media[data-full-url]:hover video {
    border-color: var(--color-accent);
}

.media-item-controls {
    display: flex;
    gap: 4px;
}

.media-ctrl {
    flex: 1;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: 6px;
    padding: 2px 4px;
    font-size: 13px;
    line-height: 1.6;
    cursor: pointer;
    color: var(--color-text-muted);
}

.media-ctrl:hover:not(:disabled) {
    border-color: var(--color-accent);
    color: var(--color-accent-dark);
}

.media-ctrl:disabled {
    opacity: 0.3;
    cursor: default;
}

.media-ctrl-delete {
    color: #b03434;
}

.media-ctrl-delete:hover:not(:disabled) {
    border-color: #b03434;
    color: #b03434;
}

.media-item-file {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 140px;
    border-radius: 8px;
    border: 1px solid var(--color-border);
    background: var(--color-bg);
    text-align: center;
    padding: 8px;
    font-size: 13px;
    color: var(--color-accent-dark);
    text-decoration: none;
}

/* --- Formulár na novú kapitolu --- */

#chapter-form {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

#chapter-form label {
    font-size: 13px;
    color: var(--color-text-muted);
    margin-top: 10px;
}

#chapter-form input,
#chapter-form select,
#chapter-form textarea {
    padding: 10px 12px;
    border: 1px solid var(--color-border);
    border-radius: 8px;
    font-size: 15px;
    font-family: inherit;
    background: var(--color-surface);
    color: var(--color-text);
    width: 100%;
}

#chapter-form textarea {
    resize: vertical;
}

#chapter-form input:focus,
#chapter-form select:focus,
#chapter-form textarea:focus {
    outline: 2px solid var(--color-accent);
    outline-offset: 1px;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

.form-row > div {
    display: flex;
    flex-direction: column;
}

.form-submit {
    margin-top: 22px;
    align-self: flex-start;
}

/* --- Upload médií --- */

.media-upload {
    margin-top: 28px;
    padding: 18px 20px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: 10px;
}

.media-upload h3 {
    margin: 0 0 12px;
    font-size: 15px;
    font-family: var(--font-serif);
}

.media-upload-row {
    display: flex;
    gap: 10px;
    margin-bottom: 10px;
}

.media-upload select,
.media-upload input[type="text"] {
    padding: 9px 10px;
    border: 1px solid var(--color-border);
    border-radius: 8px;
    font-size: 14px;
    font-family: inherit;
    background: var(--color-bg);
    color: var(--color-text);
}

.media-upload input[type="text"] {
    width: 100%;
    margin-bottom: 12px;
}

.media-upload input[type="file"] {
    flex: 1;
    font-size: 13px;
}

.upload-status {
    margin-top: 10px;
    font-size: 13px;
    color: var(--color-text-muted);
}

/* --- Lightbox --- */

.lightbox {
    position: fixed;
    inset: 0;
    background: rgba(20, 16, 12, 0.92);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 100;
    padding: 40px;
}

.lightbox-content {
    max-width: 100%;
    max-height: 100%;
}

.lightbox-content img,
.lightbox-content video {
    max-width: 100%;
    max-height: 85vh;
    border-radius: 6px;
    display: block;
    margin: 0 auto;
}

.lightbox-close {
    position: absolute;
    top: 16px;
    right: 24px;
    background: none;
    border: none;
    color: #fff;
    font-size: 34px;
    line-height: 1;
    cursor: pointer;
}