/**
 * style.css — Centrální styly pro IS Benediktinský aeroklub Broumov (LKBR)
 *
 * Struktura:
 *  1. CSS proměnné (design tokens)
 *  2. Reset a základní typografie
 *  3. Layout (body, container)
 *  4. IS hlavička (back link + název stránky)
 *  5. Tlačítka
 *  6. Formuláře
 *  7. Tabulky
 *  8. Alerty a zprávy
 *  9. Sekce a boxy
 * 10. Odznaky (štítky)
 * 11. Stránkování
 * 12. Utility třídy
 * 13. Responzivita
 */

/* ============================================================
   1. CSS PROMĚNNÉ
   ============================================================ */
:root {
    /* Primární paleta (shodná s veřejným webem lkbr.cz) */
    --color-primary:    #0ea5e9;
    --color-primary-dk: #0369a1;
    --color-dark:       #1e3a5f;

    /* Stavové barvy */
    --color-success:  #16a34a;
    --color-success-bg: #dcfce7;
    --color-danger:   #dc2626;
    --color-danger-bg: #fee2e2;
    --color-warning:  #d97706;
    --color-warning-bg: #fef3c7;
    --color-info:     #0891b2;
    --color-info-bg:  #e0f2fe;
    --color-purple:   #7c3aed;
    --color-purple-bg: #ede9fe;

    /* Neutrální */
    --bg-body:    #f1f5f9;
    --bg-card:    #ffffff;
    --bg-section: #f8fafc;
    --bg-muted:   #f1f5f9;

    /* Text */
    --text-main:  #1e293b;
    --text-muted: #64748b;
    --text-light: #94a3b8;

    /* Okraje */
    --border:       #e2e8f0;
    --border-focus: #0ea5e9;

    /* Zaoblení */
    --radius-sm: 4px;
    --radius:    6px;
    --radius-lg: 8px;

    /* Stíny */
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
    --shadow:    0 2px 8px rgba(0,0,0,0.10);

    /* Typografie */
    --font: 'Inter', system-ui, -apple-system, sans-serif;
    --font-size-base: 14px;
}

/* ============================================================
   2. RESET A ZÁKLADNÍ TYPOGRAFIE
   ============================================================ */
*, *::before, *::after { box-sizing: border-box; }

body {
    font-family: var(--font);
    font-size: var(--font-size-base);
    background: var(--bg-body);
    color: var(--text-main);
    margin: 0;
    padding: 20px;
    line-height: 1.5;
}

h1, h2, h3, h4 {
    color: var(--color-dark);
    margin-top: 0;
}

a { color: var(--color-primary-dk); }
a:hover { color: var(--color-primary); }

/* ============================================================
   3. LAYOUT
   ============================================================ */

/* Standardní kontejner (většina IS stránek) */
.container {
    background: var(--bg-card);
    max-width: 1100px;
    margin: 0 auto;
    padding: 24px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
}

/* Úzký kontejner (formuláře, pokladna) */
.container-sm {
    max-width: 820px;
}

/* Široký kontejner (kniha letů, tisk) */
.container-lg {
    max-width: 1340px;
}

/* ============================================================
   4. IS HLAVIČKA (back link + název stránky)
   ============================================================ */
.is-header {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 20px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--border);
    flex-wrap: wrap;
}

.is-header h1,
.is-header h2 {
    margin: 0;
    font-size: 1.4em;
    font-weight: 700;
    color: var(--color-dark);
}

.btn-zpet {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    text-decoration: none;
    color: var(--text-muted);
    font-weight: 600;
    font-size: 0.9em;
    padding: 6px 12px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border);
    background: var(--bg-card);
    transition: all 0.15s;
    white-space: nowrap;
}
.btn-zpet:hover {
    background: var(--bg-muted);
    color: var(--text-main);
    border-color: #cbd5e1;
}

/* Záhlaví sekce (h2/h3 s oddělovací čárou) */
.sekce-titulek {
    font-size: 1.05em;
    font-weight: 700;
    color: var(--color-dark);
    margin-top: 24px;
    margin-bottom: 16px;
    padding-bottom: 8px;
    border-bottom: 2px solid var(--border);
}

/* ============================================================
   5. TLAČÍTKA
   ============================================================ */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    padding: 8px 16px;
    border: none;
    border-radius: var(--radius);
    font-family: var(--font);
    font-size: 0.9em;
    font-weight: 600;
    cursor: pointer;
    text-decoration: none;
    transition: opacity 0.15s, background 0.15s;
    white-space: nowrap;
    line-height: 1.4;
}

.btn:disabled { opacity: 0.55; cursor: not-allowed; }

/* Varianty */
.btn-primary   { background: var(--color-primary);    color: white; }
.btn-primary:hover   { background: var(--color-primary-dk); color: white; }

.btn-dark      { background: var(--color-dark);       color: white; }
.btn-dark:hover      { background: #163059; color: white; }

.btn-success   { background: var(--color-success);    color: white; }
.btn-success:hover   { background: #15803d; color: white; }

.btn-danger    { background: var(--color-danger);     color: white; }
.btn-danger:hover    { background: #b91c1c; color: white; }

.btn-warning   { background: var(--color-warning);    color: white; }
.btn-warning:hover   { background: #b45309; color: white; }

.btn-purple    { background: var(--color-purple);     color: white; }
.btn-purple:hover    { background: #6d28d9; color: white; }

.btn-info      { background: var(--color-info);       color: white; }
.btn-info:hover      { background: #0e7490; color: white; }

.btn-secondary {
    background: var(--bg-muted);
    color: var(--text-main);
    border: 1px solid var(--border);
}
.btn-secondary:hover { background: #e2e8f0; }

.btn-outline {
    background: transparent;
    color: var(--color-primary-dk);
    border: 1px solid var(--color-primary);
}
.btn-outline:hover { background: var(--color-info-bg); }

/* Velikosti */
.btn-sm { padding: 5px 10px; font-size: 0.8em; border-radius: var(--radius-sm); }
.btn-lg { padding: 11px 22px; font-size: 1em; }
.btn-block { width: 100%; justify-content: center; }

/* ============================================================
   6. FORMULÁŘE
   ============================================================ */
label {
    display: block;
    font-weight: 600;
    font-size: 0.85em;
    color: var(--text-muted);
    margin-bottom: 5px;
}

input[type="text"],
input[type="number"],
input[type="date"],
input[type="time"],
input[type="email"],
input[type="password"],
input[type="search"],
input[type="url"],
input[type="tel"],
select,
textarea {
    width: 100%;
    padding: 9px 11px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-family: var(--font);
    font-size: 0.95em;
    color: var(--text-main);
    background: var(--bg-card);
    transition: border-color 0.15s, box-shadow 0.15s;
    box-sizing: border-box;
}

input:focus,
select:focus,
textarea:focus {
    outline: none;
    border-color: var(--border-focus);
    box-shadow: 0 0 0 3px rgba(14, 165, 233, 0.12);
}

textarea { resize: vertical; min-height: 80px; }

/* Mřížkové layouty formulářů */
.grid-2 { display: grid; grid-template-columns: 1fr 1fr;         gap: 16px; }
.grid-3 { display: grid; grid-template-columns: 1fr 1fr 1fr;     gap: 16px; }
.grid-4 { display: grid; grid-template-columns: 1fr 1fr 1fr 1fr; gap: 16px; }

/* Formulářová skupina */
.form-group { margin-bottom: 14px; }

/* ============================================================
   7. TABULKY
   ============================================================ */
table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9em;
    margin-top: 8px;
}

th {
    background: var(--bg-section);
    color: var(--text-muted);
    font-weight: 600;
    font-size: 0.82em;
    text-transform: uppercase;
    letter-spacing: 0.03em;
    padding: 10px 12px;
    border: 1px solid var(--border);
    text-align: left;
}

td {
    padding: 10px 12px;
    border: 1px solid var(--border);
    vertical-align: middle;
}

tr:hover td { background: #f8fafc; }

/* Seřaditelné sloupce */
.th-klik {
    cursor: pointer;
    color: var(--color-primary-dk);
    user-select: none;
}
.th-klik:hover { text-decoration: underline; }
.th-sort { color: var(--color-primary-dk); text-decoration: none; user-select: none; white-space: nowrap; }
.th-sort:hover { text-decoration: underline; }
.th-sort .sort-icon { font-size: 0.8em; color: #aaa; margin-left: 2px; }
.th-sort.sort-active .sort-icon { color: var(--color-primary-dk); }

/* Textový filtr pod hlavičkou */
.filter-input,
.filter-date {
    width: 100%;
    padding: 4px 6px;
    margin-top: 5px;
    font-weight: normal;
    font-size: 0.85em;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    background: var(--bg-card);
    font-family: var(--font);
    box-sizing: border-box;
    text-transform: none;
    letter-spacing: 0;
}

/* ============================================================
   8. ALERTY A ZPRÁVY
   ============================================================ */
.zprava,
.alert,
.alert-success {
    padding: 12px 16px;
    border-radius: var(--radius);
    font-weight: 600;
    margin-bottom: 16px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.zprava,
.alert-success { background: var(--color-success);    color: white; }
.chyba,
.alert-danger  { background: var(--color-danger);     color: white;
                 padding: 12px 16px; border-radius: var(--radius);
                 font-weight: 600; margin-bottom: 16px; }
.alert-warning { background: var(--color-warning-bg); color: #92400e;
                 border: 1px solid #fde68a; }
.alert-info    { background: var(--color-info-bg);    color: #0c4a6e;
                 border: 1px solid #bae6fd; }

/* Jemnější varianty (nezvýrazněné) */
.alert-success-soft {
    background: var(--color-success-bg);
    color: #14532d;
    border: 1px solid #86efac;
    padding: 12px 16px;
    border-radius: var(--radius);
    margin-bottom: 16px;
}
.alert-danger-soft {
    background: var(--color-danger-bg);
    color: #7f1d1d;
    border: 1px solid #fca5a5;
    padding: 12px 16px;
    border-radius: var(--radius);
    margin-bottom: 16px;
}

/* ============================================================
   9. SEKCE A BOXY
   ============================================================ */

/* Obecný ohraničený box (s barevným levým pruhem) */
.sekce-box {
    background: var(--bg-section);
    border-radius: var(--radius);
    padding: 18px 20px;
    margin-bottom: 20px;
    border-left: 4px solid var(--color-primary);
}

.sekce-box.zelena  { border-left-color: var(--color-success); }
.sekce-box.cervena { border-left-color: var(--color-danger);  }
.sekce-box.fialova { border-left-color: var(--color-purple);  }
.sekce-box.oranzova { border-left-color: var(--color-warning); }

/* Admin / formulářový box */
.admin-box,
.filtr-box {
    background: var(--bg-muted);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 16px 20px;
    margin-bottom: 20px;
}

/* Box se zůstatkem / velkým číslem */
.zustatek-box {
    background: var(--bg-section);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 20px;
    text-align: center;
    margin-bottom: 20px;
}

.zustatek-box .label {
    font-size: 0.9em;
    color: var(--text-muted);
    margin-bottom: 6px;
}

.zustatek-box .castka-velka {
    font-size: 2.6em;
    font-weight: 700;
    line-height: 1.1;
}

/* ============================================================
   10. ODZNAKY (ŠTÍTKY)
   ============================================================ */
.stitek {
    display: inline-block;
    padding: 3px 8px;
    border-radius: 20px;
    font-size: 0.75em;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    line-height: 1.4;
}

.stitek-primary { background: #dbeafe; color: #1d4ed8; }
.stitek-success { background: var(--color-success-bg); color: #14532d; }
.stitek-danger  { background: var(--color-danger-bg);  color: #7f1d1d; }
.stitek-warning { background: var(--color-warning-bg); color: #78350f; }
.stitek-info    { background: var(--color-info-bg);    color: #0c4a6e; }
.stitek-purple  { background: var(--color-purple-bg);  color: #4c1d95; }
.stitek-gray    { background: #f1f5f9; color: #475569; }

/* Starý styl štítku (tmavé pozadí, bílý text) — zpětná kompatibilita */
.stitek-dark {
    background: #475569;
    color: white;
    display: inline-block;
    padding: 3px 7px;
    border-radius: var(--radius-sm);
    font-size: 0.75em;
    font-weight: 700;
    text-transform: uppercase;
}

/* ============================================================
   11. STRÁNKOVÁNÍ
   ============================================================ */
.pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 4px;
    margin-top: 20px;
    flex-wrap: wrap;
}

.page-btn {
    padding: 6px 12px;
    border: 1px solid var(--border);
    background: var(--bg-card);
    color: var(--text-main);
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 0.9em;
    font-weight: 600;
    text-decoration: none;
    transition: background 0.15s;
    font-family: var(--font);
}

.page-btn:hover    { background: var(--bg-muted); color: var(--text-main); }
.page-btn.active   { background: var(--color-primary); color: white; border-color: var(--color-primary); }
.page-btn:disabled { opacity: 0.45; cursor: default; }

/* ============================================================
   12. UTILITY TŘÍDY
   ============================================================ */
.plus   { color: var(--color-success); }
.minus  { color: var(--color-danger);  }

.text-muted  { color: var(--text-muted); }
.text-light  { color: var(--text-light); }
.text-center { text-align: center; }
.text-right  { text-align: right; }
.text-bold   { font-weight: 700; }

.mt-0  { margin-top: 0; }
.mb-0  { margin-bottom: 0; }
.mt-1  { margin-top: 8px; }
.mb-1  { margin-bottom: 8px; }
.mt-2  { margin-top: 16px; }
.mb-2  { margin-bottom: 16px; }
.mt-3  { margin-top: 24px; }
.mb-3  { margin-bottom: 24px; }

.d-flex       { display: flex; }
.align-center { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-1 { gap: 8px; }
.gap-2 { gap: 16px; }
.flex-wrap { flex-wrap: wrap; }

.w-auto { width: auto !important; }

/* Wrapper pro horizontálně scrollovatelné tabulky na mobilu */
.table-wrap {
    overflow-x: auto;
    width: 100%;
    -webkit-overflow-scrolling: touch;
}

/* Responzivní gridy pro formuláře (pojmenované varianty) */
.grid-2-1   { display: grid; grid-template-columns: 2fr 1fr;       gap: 16px; }
.grid-3-col { display: grid; grid-template-columns: 1fr 1fr 1fr;   gap: 16px; }
.grid-2-2-1 { display: grid; grid-template-columns: 2fr 2fr 1fr;   gap: 16px; }

/* ============================================================
   13. RESPONZIVITA
   ============================================================ */
@media (max-width: 768px) {
    body { padding: 10px; }

    .container { padding: 16px; border-radius: var(--radius); }

    .grid-2,
    .grid-3,
    .grid-4,
    .grid-2-1,
    .grid-3-col,
    .grid-2-2-1 { grid-template-columns: 1fr; }

    table { font-size: 0.82em; }
    th, td { padding: 8px; }

    .is-header { flex-direction: column; align-items: flex-start; gap: 8px; }

    .btn-lg { padding: 9px 16px; font-size: 0.95em; }

    /* Flex řádky s tlačítky — zalamovat na mobilu */
    .flex-row-btns {
        flex-direction: column;
        align-items: stretch;
    }
    .flex-row-btns .btn { justify-content: center; }
}

@media (max-width: 480px) {
    .pagination { gap: 2px; }
    .page-btn   { padding: 5px 9px; font-size: 0.82em; }

    /* Boxy se zůstatkem — menší číslo */
    .zustatek-box .castka-velka { font-size: 2em; }
}

/* ============================================================
   14. TLAČÍTKO "NAHORU"
   ============================================================ */
#btn-nahoru {
    position: fixed;
    bottom: 28px;
    right: 28px;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: var(--color-dark);
    color: white;
    border: none;
    cursor: pointer;
    font-size: 1.2em;
    line-height: 44px;
    text-align: center;
    box-shadow: 0 3px 10px rgba(0,0,0,0.25);
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.25s, visibility 0.25s, background 0.2s;
    z-index: 999;
}

#btn-nahoru.viditelny {
    opacity: 1;
    visibility: visible;
}

#btn-nahoru:hover {
    background: var(--color-primary-dk);
}

@media (max-width: 768px) {
    #btn-nahoru { bottom: 16px; right: 16px; width: 40px; height: 40px; line-height: 40px; }
}