/* =====================================================================
   Učiteľský Šuflík – vzhľad „Predvolený“ (zošit s krúžkovou väzbou)
   Načítava sa pre Predvolený aj Jeseň (jesen.css ho len prefarbí), po system.css.
   Tmavý režim = večerný zošit, svetlý režim = biely papier s modrými linajkami.
   Všetky farby sú v premenných --zs-* (strana zošita) a --m-* (karty, okraje – system.css).
   ===================================================================== */

:root {
    --zs-desk: #070a15;          /* stôl pod zošitom */
    --zs-page: #121a36;          /* strana zošita */
    --zs-page-2: #0e1530;
    --zs-rule: rgba(148, 178, 255, 0.085);
    --zs-margin: rgba(237, 86, 134, 0.5);
    --zs-glow-1: rgba(237, 86, 134, 0.08);
    --zs-glow-2: rgba(125, 211, 252, 0.05);
    --zs-glow-3: rgba(169, 232, 161, 0.04);
    --zs-page-edge: rgba(148, 178, 255, 0.08);
    --zs-nav: rgba(14, 21, 46, 0.86);
    --zs-nav-border: rgba(88, 108, 160, 0.25);
    --zs-footer: rgba(7, 10, 21, 0.92);
    --zs-ring-hole: #02040a;

    /* Povrchy ladené do modrej strany zošita */
    --m-bg: #0e1530;
    --m-surface: #131c38;
    --m-surface-2: #182241;
    --m-input: #0b1129;
    --m-border: rgba(120, 140, 200, 0.2);
    --m-border-strong: rgba(120, 140, 200, 0.32);
    --color-ink: #0b1129;
    --color-slate-950: #0b1129;
    --color-slate-900: #131b36;
    --color-slate-800: #1f2a4b;
    --color-slate-700: #2f3b60;
    --color-slate-600: #4b577c;
    --color-slate-500: #8e9ab3;   /* popisky – aj na sivých plochách aspoň 4,5 : 1 */
}

[data-theme="light"] {
    --zs-desk: #e7e3d8;
    --zs-page: #fdfcf8;
    --zs-page-2: #f8f6ef;
    --zs-rule: rgba(66, 110, 196, 0.13);
    --zs-margin: rgba(210, 58, 108, 0.42);
    --zs-glow-1: rgba(237, 86, 134, 0.05);
    --zs-glow-2: rgba(125, 180, 252, 0.06);
    --zs-glow-3: rgba(110, 200, 120, 0.05);
    --zs-page-edge: rgba(17, 20, 31, 0.08);
    --zs-nav: rgba(253, 252, 248, 0.9);
    --zs-nav-border: rgba(17, 20, 31, 0.09);
    --zs-footer: #f1efe7;
    --zs-ring-hole: #cfcabd;

    --m-bg: #f8f6ef;
    --m-surface: #ffffff;
    --m-surface-2: #fbfaf6;
    --m-input: #f8f7f2;
    --m-border: rgba(17, 20, 31, 0.09);
    --m-border-strong: rgba(17, 20, 31, 0.15);
    --color-ink: #fdfcf8;
    --color-slate-950: #f5f3ec;
    --color-slate-900: #ffffff;
    --color-slate-800: #e6e3da;
    --color-slate-700: #d5d1c6;
    --color-slate-600: #a3a39f;
    --color-slate-500: #5b6272;
}

.bg-notebook { background-color: var(--zs-desk); }

/* Strana zošita: linajky, okrajová čiara, jemné svetlo zhora */
.bg-notebook::after {
    content: '';
    position: fixed;
    top: 10px; right: 10px; bottom: 0; left: 30px;
    z-index: -1;
    pointer-events: none;
    border-radius: 26px 26px 0 0;
    background-color: var(--zs-page);
    background-image:
        radial-gradient(1100px 520px at 50% -8%, var(--zs-glow-1), transparent 62%),
        radial-gradient(900px 600px at 105% 30%, var(--zs-glow-2), transparent 60%),
        radial-gradient(800px 500px at -5% 85%, var(--zs-glow-3), transparent 60%),
        linear-gradient(90deg, transparent 72px, var(--zs-margin) 72px, var(--zs-margin) 73.5px, transparent 73.5px),
        repeating-linear-gradient(to bottom, transparent 0, transparent 33px, var(--zs-rule) 33px, var(--zs-rule) 34px),
        linear-gradient(180deg, var(--zs-page) 0%, var(--zs-page-2) 100%);
    background-size: auto;
    box-shadow: 0 0 0 1px var(--zs-page-edge), 0 30px 80px -20px rgba(0, 0, 0, 0.55), inset 0 1px 0 rgba(255, 255, 255, 0.05);
}
[data-theme="light"] .bg-notebook::after { box-shadow: 0 0 0 1px var(--zs-page-edge), 0 18px 50px -24px rgba(60, 50, 30, 0.35); }

/* Krúžková väzba vľavo (jeden krúžok ako obrázok, opakuje sa nadol) */
.bg-notebook::before {
    content: '';
    position: fixed;
    top: 34px; bottom: 0; left: 6px;
    width: 44px;
    z-index: 0;
    pointer-events: none;
    display: block;
    background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='44' height='42'%3E%3Cdefs%3E%3ClinearGradient id='g' x1='0' y1='0' x2='0' y2='1'%3E%3Cstop offset='0' stop-color='%23d5dbea'/%3E%3Cstop offset='.35' stop-color='%235d6782'/%3E%3Cstop offset='1' stop-color='%230a0e1a'/%3E%3C/linearGradient%3E%3C/defs%3E%3Ccircle cx='34' cy='22' r='5.4' fill='%2302040a'/%3E%3Ccircle cx='34' cy='22' r='5.4' fill='none' stroke='%232a3350' stroke-width='1'/%3E%3Cpath d='M34 19.5 C 24 13, 9 13, 5 21 C 9 29, 24 29, 34 24.5' fill='none' stroke='%2305070e' stroke-width='6' stroke-linecap='round'/%3E%3Cpath d='M34 19.5 C 24 13, 9 13, 5 21 C 9 29, 24 29, 34 24.5' fill='none' stroke='url%28%23g%29' stroke-width='4' stroke-linecap='round'/%3E%3C/svg%3E") 0 0 / 44px 42px repeat-y;
    filter: drop-shadow(0 3px 2px rgba(0, 0, 0, 0.55));
}
[data-theme="light"] .bg-notebook::before { filter: drop-shadow(0 2px 1.5px rgba(60, 50, 30, 0.35)); }

/* Obsah sa nesmie dotýkať krúžkov */
@media (min-width: 1024px) and (max-width: 1360px) {
    body.bg-notebook > main, body.bg-notebook > footer, body.bg-notebook > div > nav { padding-left: 52px; }
}

/* Mobil a tablet: strana cez celú šírku, bez krúžkov a okraja */
@media (max-width: 1023px) {
    .bg-notebook::after { top: 0; right: 0; left: 0; border-radius: 0; box-shadow: none;
        background-image:
            radial-gradient(700px 420px at 50% -8%, var(--zs-glow-1), transparent 62%),
            repeating-linear-gradient(to bottom, transparent 0, transparent 33px, var(--zs-rule) 33px, var(--zs-rule) 34px),
            linear-gradient(180deg, var(--zs-page) 0%, var(--zs-page-2) 100%); }
    .bg-notebook::before { display: none; }
}

/* Karty: plná plocha strany, jemný okraj a mäkký tieň (system.css) */
.su-card { background: var(--m-surface); border-color: var(--m-border); }
.su-card[class*="bg-gradient-to"] { background-image: linear-gradient(var(--tw-gradient-stops)); }

/* Navigácia a pätička splývajú so zošitom */
nav.border-b { background-color: var(--zs-nav) !important; border-color: var(--zs-nav-border) !important; }
footer { background-color: var(--zs-footer) !important; border-top-color: var(--zs-nav-border) !important; }

/* ---------------------------------------------------------------------
   Živé kresby (partials/zosit-doodles, partials/jesen-doodles)
   Sú len po okrajoch – v pásoch vedľa obsahu (obsah má max. 1280 px) – a len na širokých
   obrazovkách, aby nič neodpútavalo pozornosť od materiálov. Na mobile a tablete sa neukazujú.
   --------------------------------------------------------------------- */
.zs-layer { position: fixed; inset: 0; z-index: 0; pointer-events: none; overflow: hidden; display: none; opacity: 0.55; }
@media (min-width: 1280px) { .zs-layer { display: block; } }
.zs-d { position: absolute; will-change: transform; }
/* --w = šírka kresby; kresba sa drží tesne pri okraji obsahu, na užších obrazovkách pri okraji okna */
.zs-gl { left: max(58px, calc(50% - 640px - var(--w, 60px) - 28px)); width: var(--w, 60px); }
.zs-gr { right: max(16px, calc(50% - 640px - var(--w, 60px) - 28px)); width: var(--w, 60px); }

.zs-glow-pink { filter: drop-shadow(0 0 6px rgba(237, 86, 134, 0.75)); }
.zs-glow-mint { filter: drop-shadow(0 0 6px rgba(169, 232, 161, 0.7)); }
.zs-glow-gold { filter: drop-shadow(0 0 7px rgba(250, 204, 21, 0.7)); }
.zs-glow-sky { filter: drop-shadow(0 0 6px rgba(125, 211, 252, 0.7)); }

/* Kriedové písmo – svieti ako fixka */
.zs-chalk { font-family: 'Caveat', cursive; color: rgba(226, 232, 240, 0.55); text-shadow: 0 0 10px rgba(148, 178, 255, 0.35); white-space: nowrap; }

/* Pomalé vznášanie */
.zs-float { animation: zs-float 16s ease-in-out infinite; }
.zs-float-2 { animation: zs-float 20s ease-in-out infinite reverse; }
@keyframes zs-float {
    0%, 100% { transform: translate3d(0, 0, 0) rotate(var(--r, 0deg)); }
    50% { transform: translate3d(0, -7px, 0) rotate(calc(var(--r, 0deg) + 2deg)); }
}

/* Iskričky blikajú */
.zs-spark { animation: zs-spark 6s ease-in-out infinite; transform-box: fill-box; transform-origin: center; }
@keyframes zs-spark { 0%, 100% { opacity: 0.2; transform: scale(0.75); } 50% { opacity: 0.8; transform: scale(1); } }

/* Čiarkované čiary „bežia“ (lietadielko, šípky) */
.zs-march { stroke-dasharray: 7 8; animation: zs-march 1.6s linear infinite; }
@keyframes zs-march { to { stroke-dashoffset: -30; } }

/* Podčiarknutie sa dookola dokreslí fixkou */
.zs-draw { stroke-dasharray: 220; stroke-dashoffset: 220; animation: zs-draw 6s ease-in-out infinite; }
@keyframes zs-draw { 0% { stroke-dashoffset: 220; } 30%, 75% { stroke-dashoffset: 0; } 100% { stroke-dashoffset: -220; } }

/* Lietadielko letí po čiarkovanej dráhe */
.zs-plane-path { position: absolute; }
.zs-plane { offset-path: path('M10 150 C 90 40, 200 10, 300 70 S 470 160, 560 40'); offset-rotate: auto; animation: zs-fly 9s cubic-bezier(.45, .05, .55, .95) infinite; }
@keyframes zs-fly { 0% { offset-distance: 0%; opacity: 0; } 8% { opacity: 1; } 88% { opacity: 1; } 100% { offset-distance: 100%; opacity: 0; } }

/* Trojuholník a pravítko sa jemne pohupujú */
.zs-tilt { animation: zs-tilt 14s ease-in-out infinite; transform-origin: 50% 60%; }
@keyframes zs-tilt { 0%, 100% { transform: rotate(var(--r, 0deg)); } 50% { transform: rotate(calc(var(--r, 0deg) + 3deg)) translateY(-4px); } }

@media (prefers-reduced-motion: reduce) {
    .zs-float, .zs-float-2, .zs-spark, .zs-march, .zs-draw, .zs-plane, .zs-tilt { animation: none !important; }
    .zs-draw { stroke-dashoffset: 0; }
    .zs-plane { display: none; }
}