/* Potlač animaci toggleu během inicializace tématu */
.no-toggle-transition .dn-toggle__btn,
.no-toggle-transition .dn-toggle__btn * {
    transition: none !important;
}

/* =====================================================
   CSS proměnné — světlé téma (výchozí)
   ===================================================== */
:root {
    --color-bg:          #FAF7F2;
    --color-surface:     #FFFFFF;
    --color-surface-alt: #F3EDE2;
    --color-ink:         #2B2620;
    --color-ink-soft:    #6B5E52;
    --color-accent:      #8B5A3C;
    --color-accent-dark: #5D3A24;
    --color-leaf:        #4A6741;
    --color-gold:        #B8860B;
    --color-burgundy:    #722F37;
    --color-border:      #E5DDD0;
    --color-muted:       #9B9085;
}

[data-theme="dark"] {
    --color-bg:          #1A1714;
    --color-surface:     #24201C;
    --color-surface-alt: #2D2924;
    --color-ink:         #E8E0D0;
    --color-ink-soft:    #9B9085;
    --color-border:      #3A352F;
}

/* =====================================================
   Základní reset a typografie
   ===================================================== */
*, *::before, *::after { box-sizing: border-box; }

body {
    background-color: var(--color-bg);
    color: var(--color-ink);
    font-family: 'Inter', sans-serif;
    line-height: 1.6;
    transition: background-color 0.2s, color 0.2s;
}

h1, h2, h3 {
    font-family: 'Playfair Display', serif;
    letter-spacing: 0.01em;
    color: var(--color-ink);
}

a { color: var(--color-accent); text-decoration: none; }
a:hover { color: var(--color-accent-dark); }

/* =====================================================
   Navigace
   ===================================================== */
.navbar {
    background-color: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: var(--impersonate-bar-height, 0px);
    z-index: 50;
}

.navbar-brand {
    font-family: 'Playfair Display', serif;
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--color-accent);
    display: flex;
    align-items: center;
}
.navbar-brand:hover { color: var(--color-accent-dark); }

.navbar-logo {
    height: 50px;
    width: auto;
    position: absolute;
    left: calc((100% - 72rem) / 2 - 32px);
    top: 50%;
    transform: translateY(-50%);
    z-index: 51;
}
@media (max-width: 1024px) {
    .navbar-logo {
        position: static;
        transform: none;
        height: 44px;
        width: auto;
        margin-left: 0;
    }
}

.nav-link {
    color: var(--color-ink-soft);
    font-size: 0.9rem;
    font-weight: 500;
    padding: 0.25rem 0;
    transition: color 0.15s;
    border-bottom: 2px solid transparent;
}
.nav-link:hover,
.nav-link.active {
    color: var(--color-accent);
    border-bottom-color: var(--color-accent);
}

/* =====================================================
   Tlačítka
   ===================================================== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.5rem 1.25rem;
    border-radius: 0.5rem;
    font-size: 0.9rem;
    font-weight: 500;
    transition: all 0.2s;
    cursor: pointer;
    border: none;
}

.btn-primary {
    background-color: var(--color-accent);
    color: #fff;
}
.btn-primary:hover { background-color: var(--color-accent-dark); color: #fff; }

.btn-outline {
    background-color: transparent;
    border: 1.5px solid var(--color-border);
    color: var(--color-ink-soft);
}
.btn-outline:hover { border-color: var(--color-accent); color: var(--color-accent); }

.btn-danger {
    background-color: #dc2626;
    color: #fff;
}
.btn-danger:hover { background-color: #b91c1c; }

.btn-icon {
    background: none;
    border: none;
    padding: 0.4rem;
    cursor: pointer;
    border-radius: 0.375rem;
    color: var(--color-ink-soft);
    transition: color 0.15s, background 0.15s;
    display: inline-flex;
    align-items: center;
}
.btn-icon:hover { color: var(--color-accent); background: var(--color-surface-alt); }

/* =====================================================
   Karty a plochy
   ===================================================== */
.card {
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: 0.75rem;
    padding: 1.25rem;
    transition: box-shadow 0.2s, transform 0.2s;
}
.card:hover { box-shadow: 0 4px 16px rgba(0,0,0,0.08); }

.card-book {
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: 0.75rem;
    overflow: hidden;
    transition: box-shadow 0.2s, transform 0.2s;
    cursor: pointer;
    display: flex;
    flex-direction: column;
    position: relative;
}

.card-book:hover {
    box-shadow: 0 8px 24px rgba(0,0,0,0.1);
    transform: translateY(-2px);
}

.card-book .cover-wrap {
    aspect-ratio: 2/3;
    overflow: hidden;
    background-color: var(--color-surface-alt);
    position: relative;
}
.card-book .cover-wrap img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s;
}
.card-book:hover .cover-wrap img { transform: scale(1.04); }

/* Odznaky formátu knihy (fyzická / audio / e-kniha) v levém horním rohu obalu */
.format-badges {
    position: absolute;
    top: 5px;
    left: 5px;
    z-index: 3;
    display: flex;
    gap: 3px;
}
.format-badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 22px;
    height: 22px;
    border-radius: 9999px;
    font-size: 11px;
    line-height: 1;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.35);
    border: 1.5px solid rgba(255, 255, 255, 0.85);
}

.card-book .card-body {
    padding: 0.45rem;
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 0.15rem;
    font-size: 0.75rem;
}

/* Placeholder obálky */
.cover-placeholder {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: 'Playfair Display', serif;
    font-size: 2rem;
    font-weight: 700;
    color: rgba(255,255,255,0.85);
    letter-spacing: 0.05em;
}

/* =====================================================
   Badge
   ===================================================== */
.badge {
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
    font-size: 0.7rem;
    font-weight: 600;
    padding: 0.15rem 0.5rem;
    border-radius: 999px;
    white-space: nowrap;
}

.badge-owned    { background: #dcfce7; color: #166534; }
.badge-wishlist { background: transparent; border: 1.5px solid var(--color-burgundy); color: var(--color-burgundy); }
.badge-upcoming { background: transparent; border: 1.5px solid var(--color-accent); color: var(--color-accent); }
.badge-preorder { background: transparent; border: 1.5px solid #6366f1; color: #6366f1; }

[data-theme="dark"] .badge-preorder { border-color: #818cf8; color: #818cf8; }

.badge-voucher {
    background: linear-gradient(135deg, #B8860B, #DAA520);
    color: #fff;
}

[data-theme="dark"] .badge-owned { background: #14532d; color: #86efac; }

/* =====================================================
   KPI karty (dashboard)
   ===================================================== */
.kpi-card {
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-top: 3px solid var(--color-accent);
    border-radius: 0.75rem;
    padding: 1.25rem 1.5rem 1.1rem;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    height: 130px;
}
.kpi-value {
    font-family: 'Playfair Display', serif;
    font-size: 2.6rem;
    font-weight: 700;
    color: var(--color-ink);
    line-height: 1;
    letter-spacing: -0.03em;
}
.kpi-label {
    font-size: 0.7rem;
    font-weight: 600;
    color: var(--color-muted);
    text-transform: uppercase;
    letter-spacing: 0.08em;
}
.kpi-sub {
    font-size: 0.7rem;
    color: var(--color-muted);
    margin-top: 0.1rem;
}

/* =====================================================
   Formuláře
   ===================================================== */
.form-group { display: flex; flex-direction: column; gap: 0.3rem; margin-bottom: 1rem; }
.form-group:last-of-type { margin-bottom: 0; }
.form-label { font-size: 0.875rem; font-weight: 500; color: var(--color-ink-soft); }

.form-input,
.form-select,
.form-textarea {
    background-color: var(--color-surface);
    border: 1.5px solid var(--color-border);
    border-radius: 0.5rem;
    padding: 0.5rem 0.75rem;
    font-size: 0.9rem;
    color: var(--color-ink);
    transition: border-color 0.15s;
    width: 100%;
    font-family: 'Inter', sans-serif;
}
.form-input:focus,
.form-select:focus,
.form-textarea:focus {
    outline: none;
    border-color: var(--color-accent);
}
.form-textarea { resize: vertical; min-height: 6rem; }

.form-error { font-size: 0.8rem; color: #dc2626; }

/* Status radio */
.status-radio { display: none; }
.status-label {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.35rem;
    padding: 0.75rem 0.5rem;
    border: 2px solid var(--color-border);
    border-radius: 0.75rem;
    cursor: pointer;
    font-size: 0.8rem;
    color: var(--color-ink-soft);
    transition: all 0.15s;
    width: 110px;
    text-align: center;
}
.status-radio:checked + .status-label {
    border-color: var(--color-accent);
    color: var(--color-accent);
    background: var(--color-surface-alt);
}

/* Star rating widget */
.star-rating {
    display: inline-flex;
    flex-direction: row-reverse;
    gap: 2px;
}
.star-rating input { display: none; }
.star-rating label {
    cursor: pointer;
    font-size: 1.5rem;
    color: var(--color-border);
    transition: color 0.1s;
    line-height: 1;
    padding: 0 1px;
}
.star-rating label.half { font-size: 1.5rem; }
.star-rating input:checked ~ label,
.star-rating label:hover,
.star-rating label:hover ~ label {
    color: var(--color-gold);
}
.star-rating-sm label { font-size: 1.1rem; }

/* Toggle switch */
.toggle-wrap { display: flex; align-items: center; gap: 0.75rem; cursor: pointer; }
.toggle {
    position: relative; width: 44px; height: 24px;
    background: var(--color-border); border-radius: 999px;
    transition: background 0.2s;
    flex-shrink: 0;
}
.toggle::after {
    content: '';
    position: absolute;
    left: 3px; top: 3px;
    width: 18px; height: 18px;
    background: #fff; border-radius: 50%;
    transition: transform 0.2s;
}
input:checked ~ .toggle,
.toggle.active { background: var(--color-gold); }
input:checked ~ .toggle::after,
.toggle.active::after { transform: translateX(20px); }

/* =====================================================
   Hvězdičky hodnocení
   ===================================================== */
.star { font-size: 1rem; }
.star-full  { color: var(--color-gold); }
.star-half  { color: var(--color-gold); }
.star-empty { color: var(--color-border); }

/* =====================================================
   Skupiny knih po měsících
   ===================================================== */
.month-heading {
    font-family: 'Playfair Display', serif;
    font-size: 1.3rem;
    color: var(--color-ink-soft);
    margin: 2rem 0 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--color-border);
}

/* =====================================================
   Grid knih
   ===================================================== */
.books-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0.6rem;
}
@media (min-width: 640px)  { .books-grid { grid-template-columns: repeat(5, 1fr); } }
@media (min-width: 1024px) { .books-grid { grid-template-columns: repeat(7, 1fr); } }
@media (min-width: 1280px) { .books-grid { grid-template-columns: repeat(8, 1fr); } }

/* =====================================================
   Prázdný stav
   ===================================================== */
.empty-state {
    text-align: center;
    padding: 4rem 2rem;
    color: var(--color-muted);
}
.empty-state svg { opacity: 0.3; margin: 0 auto 1rem; }
.empty-state p   { font-size: 1rem; }

/* =====================================================
   Spinner / skeleton
   ===================================================== */
.spinner {
    width: 28px; height: 28px;
    border: 3px solid var(--color-border);
    border-top-color: var(--color-accent);
    border-radius: 50%;
    animation: spin 0.7s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

.skeleton {
    background: linear-gradient(90deg, var(--color-border) 25%, var(--color-surface-alt) 50%, var(--color-border) 75%);
    background-size: 200% 100%;
    animation: shimmer 1.2s infinite;
    border-radius: 0.4rem;
}
@keyframes shimmer { to { background-position: -200% 0; } }

/* =====================================================
   Přihlašovací stránka
   ===================================================== */
.login-wrap {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--color-bg);
}
.login-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: 1rem;
    padding: 2.5rem;
    width: 100%;
    max-width: 380px;
}

/* =====================================================
   Utility
   ===================================================== */
.text-muted   { color: var(--color-muted); }
.text-accent  { color: var(--color-accent); }
.text-ink-soft{ color: var(--color-ink-soft); }
.bg-surface   { background-color: var(--color-surface); }
.border-border{ border-color: var(--color-border); }

.divider { border: none; border-top: 1px solid var(--color-border); margin: 1.5rem 0; }

/* Alerts */
.alert { padding: 0.75rem 1rem; border-radius: 0.5rem; font-size: 0.9rem; margin-bottom: 1rem; }
.alert-success { background: #f0fdf4; border: 1px solid #86efac; color: #166534; }
.alert-error   { background: #fef2f2; border: 1px solid #fca5a5; color: #991b1b; }
.alert-info    { background: var(--color-surface-alt); border: 1px solid var(--color-border); color: var(--color-ink-soft); }

[data-theme="dark"] .alert-success { background: #14532d; color: #86efac; }
[data-theme="dark"] .alert-error   { background: #7f1d1d; color: #fca5a5; }

/* =====================================================
   Day / Night toggle (přepínač tématu v navigaci)
   ===================================================== */
.dn-toggle {
    display: inline-block;
    user-select: none;
    /* scale zachová všechny proporce originálu */
    transform: scale(0.6);
    transform-origin: center center;
    width: 125px;
    height: 70px;
    margin: -14px -25px; /* kompenzace místa po scale */
}

.dn-toggle__cb { display: none; }

.dn-toggle__btn {
    position: relative;
    display: block;
    width: 125px;
    height: 70px;
    border-radius: 70px;
    border: 5px solid #1c1c1c;
    background-color: #3c4145;
    cursor: pointer;
    transition: background-color 250ms ease-in, border-color 250ms ease-in;
}

/* měsíc / slunce */
.dn-toggle__btn::before {
    content: '';
    position: absolute;
    top: 2px;
    left: 4px;
    width: 56px;
    height: 56px;
    border-radius: 50%;
    background-color: #fff;
    border: 5px solid #e3e3c7;
    transition: all 250ms ease-in;
}

/* mrak */
.dn-toggle__btn::after {
    content: '';
    position: absolute;
    top: 62%;
    left: 54px;
    width: 11px;
    height: 11px;
    opacity: 0;
    background-color: #fff;
    border-radius: 50%;
    box-shadow:
        #fff 0 0, #fff 3px 0, #fff 6px 0, #fff 9px 0,
        #fff 11px 0, #fff 14px 0, #fff 16px 0,
        #fff 21px -1px 0 1px,
        #fff 16px -7px 0 -2px,
        #fff 7px  -7px 0  1px,
        #d3d3d3  0    0 0 4px,
        #d3d3d3  6px  0 0 4px,
        #d3d3d3 11px  0 0 4px,
        #d3d3d3 16px  0 0 4px,
        #d3d3d3 21px -1px 0 5px,
        #d3d3d3 16px -7px 0 1px,
        #d3d3d3  7px -7px 0 5px;
    transition: opacity 100ms ease-in;
}

/* hvězdy */
.dn-toggle__feature {
    display: block;
    position: absolute;
    top: 9px;
    left: 52%;
    z-index: 20;
    width: 4px;
    height: 4px;
    border-radius: 50%;
    background-color: #fff;
    box-shadow:
        rgba(255,255,255,0.1) 30px -3px 0 0,
        rgba(255,255,255,0.1) 12px 10px 0 -1px,
        #fff 38px 18px 0 1px,
        rgba(255,255,255,0.1) 32px 34px 0 0,
        #fff 20px 24px 0 -1.5px,
        rgba(255,255,255,0.1) 5px 38px 0 1px;
    animation: dn-stars 5s ease-in-out infinite;
}

/* krátery na měsíci */
.dn-toggle__feature::before {
    content: '';
    position: absolute;
    top: -2px;
    left: -25px;
    width: 18px;
    height: 18px;
    background-color: #fff;
    border-radius: 50%;
    border: 5px solid #e3e3c7;
    box-shadow: #e3e3c7 -28px 0 0 -3px, #e3e3c7 -8px 24px 0 -2px;
    transform-origin: -6px 130%;
    transition: all 250ms ease-in;
}

@keyframes dn-stars {
    50% {
        background-color: rgba(255,255,255,0.1);
        box-shadow:
            #fff 30px -3px 0 0,
            #fff 12px 10px 0 -1px,
            rgba(255,255,255,0.1) 38px 18px 0 1px,
            #fff 32px 34px 0 0,
            rgba(255,255,255,0.1) 20px 24px 0 -1.5px,
            #fff 5px 38px 0 1px;
    }
}

@keyframes dn-cloud-in {
    0%   { opacity: 0; transform: scale(.3); }
    50%  { opacity: 1; transform: scale(1.1); }
    75%  { transform: scale(.9); }
    100% { opacity: 1; transform: scale(1); }
}

/* --- den (checkbox checked) --- */
.dn-toggle__cb:checked + .dn-toggle__btn {
    background-color: #9ee3fb;
    border-color: #86c3d7;
}
.dn-toggle__cb:checked + .dn-toggle__btn::before {
    left: 61px;
    background-color: #ffdf6d;
    border-color: #e1c348;
}
.dn-toggle__cb:checked + .dn-toggle__btn::after {
    opacity: 1;
    animation: dn-cloud-in 0.6s ease-in-out 0.1s backwards;
}
.dn-toggle__cb:checked + .dn-toggle__btn .dn-toggle__feature {
    opacity: 0;
    animation: none;
    box-shadow:
        rgba(255,255,255,0.1) 30px -3px 0 -4px,
        rgba(255,255,255,0.1) 12px 10px 0 -5px,
        #fff 38px 18px 0 -3px,
        rgba(255,255,255,0.1) 32px 34px 0 -4px,
        #fff 20px 24px 0 -5.5px,
        rgba(255,255,255,0.1) 5px 38px 0 -3px;
}
.dn-toggle__cb:checked + .dn-toggle__btn .dn-toggle__feature::before {
    left: 25px;
    transform: rotate(70deg);
}

/* =====================================================
   Mobile optimalizace (max 640px)
   ===================================================== */
@media (max-width: 640px) {

    /* Dashboard — sekce pod sebou místo vedle sebe */
    .grid.md\:grid-cols-2 {
        grid-template-columns: 1fr !important;
    }

    /* Dashboard — karty knih nepřetékají do šířky */
    .card.flex.gap-3 {
        height: auto !important;
        min-height: 4.5rem;
    }
    .card.flex.gap-3 [style*="white-space:nowrap"] {
        white-space: normal !important;
        display: -webkit-box !important;
        -webkit-line-clamp: 2;
        -webkit-box-orient: vertical;
        overflow: hidden;
    }

    /* Přidat — datumové inputy nepřetékají */
    input[type="date"],
    input[type="date"].form-input {
        width: 100% !important;
        max-width: 100% !important;
        min-width: 0 !important;
        box-sizing: border-box !important;
    }
    .grid.md\:grid-cols-2 > .form-group,
    .form-group {
        min-width: 0;
        overflow: hidden;
    }

    /* Přidat — Stav tlačítka plná šířka */
    .status-label {
        width: auto !important;
        flex: 1 1 calc(50% - 0.375rem);
    }

    /* Přátelé — tlačítka pod jménem */
    .friend-row {
        flex-wrap: wrap;
        gap: 0.5rem;
    }
    .friend-row > .btn,
    .friend-row > a.btn,
    .friend-row > form > button.btn {
        flex: 1 1 auto;
        justify-content: center;
        text-align: center;
        min-width: calc(50% - 0.25rem);
    }
}