/* ==========================================================================
   SPOLUPRÁCE – styly pro spoluprace.html (a spoluprace_ru.html)
   Načítat AŽ PO style.css. Všechny třídy mají prefix .sp-, takže nezasahují
   do ostatních stránek. Navigace a patička zůstávají ze style.css.

   Nápad: spolupráce jako graf. Body (vrcholy) jsou partneři, čáry (hrany)
   jsou vztahy. Hero graf, spojnice mezi partnery i čtverečkovaný papír
   vycházejí z jednoho motivu – matematického sešitu.
   ========================================================================== */

.page-spoluprace {
    --sp-ink: #1e293b;
    --sp-muted: #55657a;
    --sp-blue: #2f6df0;
    --sp-blue-tint: #e8f0ff;
    --sp-pink: #e0244f;
    --sp-pink-deep: #c81c45;
    --sp-pink-tint: #ffe8ee;
    --sp-line: #e2e8f0;
    --sp-paper: #e6ecf6;
    --sp-open: #94a3b8;
}

/* --- Reset globálních pravidel pro <main> ze style.css ------------------- */
/* (style.css centruje main na výšku a na mobilu mu dává min-height: 100vh) */
body.page-spoluprace main.sp-main {
    display: block;
    padding: 0;
    min-height: 0;
    flex-shrink: 0;
}

.sp-main h1,
.sp-main h2,
.sp-main h3 {
    color: var(--sp-ink);
}

/* --- Nadpisy sekcí ------------------------------------------------------- */
.sp-title {
    font-size: clamp(1.75rem, 3.4vw, 2.4rem);
    text-align: center;
    margin: 0 0 56px;
    padding-bottom: 18px;
}

.sp-title::after {
    width: 64px;
    background: linear-gradient(90deg, var(--sp-blue), var(--sp-pink));
}

.sp-section {
    padding: clamp(56px, 8vw, 96px) 0;
}

.sp-section-alt {
    background: var(--bg-light);
}

/* --- Tlačítko ------------------------------------------------------------ */
.sp-btn {
    display: inline-block;
    background: var(--sp-pink);
    color: #ffffff;
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 1.2rem;
    padding: 16px 34px;
    border-radius: 999px;
    transition: background-color 0.2s ease;
}

.sp-btn:hover {
    background: var(--sp-pink-deep);
}

.sp-btn:focus-visible,
.sp-more:focus-visible,
.sp-cta-mail a:focus-visible {
    outline: 3px solid var(--sp-ink);
    outline-offset: 3px;
}

/* ==========================================================================
   1) HERO – čtverečkovaný papír + graf
   ========================================================================== */
.sp-hero {
    background-color: #ffffff;
    background-image:
        linear-gradient(to bottom, rgba(255, 255, 255, 0) 60%, #ffffff 100%),
        linear-gradient(var(--sp-paper) 1px, transparent 1px),
        linear-gradient(90deg, var(--sp-paper) 1px, transparent 1px);
    background-size: 100% 100%, 32px 32px, 32px 32px;
    padding: clamp(48px, 8vw, 96px) 0 clamp(40px, 6vw, 72px);
}

.sp-hero-grid {
    display: grid;
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    align-items: center;
    gap: 48px;
}

.sp-kicker {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    margin: 0 0 20px;
    font-weight: 600;
    font-size: 1.05rem;
    color: var(--sp-pink);
}

.sp-kicker::before {
    content: "";
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--sp-pink);
}

.sp-hero h1 {
    font-size: clamp(2rem, 4.6vw, 3.6rem);
    font-weight: 700;
    line-height: 1.08;
    letter-spacing: -0.02em;
    margin: 0 0 36px;
    padding: 0;
    max-width: 15em;
    text-wrap: balance;
}

/* --- Graf ---------------------------------------------------------------- */
.sp-graph {
    width: 100%;
    max-width: 460px;
    justify-self: center;
}

.sp-graph svg {
    display: block;
    width: 100%;
    height: auto;
    overflow: visible;
}

.sp-edge {
    fill: none;
    stroke-width: 3;
    stroke-linecap: round;
}

.sp-edge-blue { stroke: var(--sp-blue); }
.sp-edge-pink { stroke: var(--sp-pink); }

.sp-edge-open {
    stroke: var(--sp-open);
    stroke-width: 4;
    stroke-dasharray: 0.1 10;
}

.sp-node {
    cursor: pointer;
    outline: none;
}

.sp-node-me {
    cursor: default;
}

.sp-node circle.sp-fill {
    stroke: none;
}

.sp-node-me circle.sp-fill { fill: var(--sp-ink); }
.sp-node-blue circle.sp-fill { fill: var(--sp-blue); }
.sp-node-pink circle.sp-fill { fill: var(--sp-pink); }

.sp-node-open circle.sp-fill {
    fill: #ffffff;
    stroke: var(--sp-open);
    stroke-width: 3.5;
    stroke-linecap: round;
    stroke-dasharray: 0.1 9;
}

/* kroužek kolem uzlu při najetí / focusu z klávesnice */
.sp-ring {
    fill: none;
    stroke: transparent;
    stroke-width: 3;
}

.sp-node:hover .sp-ring,
.sp-node:focus-visible .sp-ring {
    stroke: var(--sp-ink);
}

.sp-node text {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 16px;
    text-anchor: middle;
    fill: #ffffff;
    pointer-events: none;
}

.sp-node-me text { font-size: 26px; }

.sp-node-open text {
    fill: var(--sp-muted);
    font-size: 22px;
}

/* Jediný animovaný okamžik stránky: graf se při načtení „nakreslí“ */
@keyframes sp-draw {
    from { stroke-dashoffset: 1; }
    to   { stroke-dashoffset: 0; }
}

@keyframes sp-pop {
    from { opacity: 0; transform: scale(0.6); }
    to   { opacity: 1; transform: scale(1); }
}

@keyframes sp-fade {
    from { opacity: 0; }
    to   { opacity: 1; }
}

@media (prefers-reduced-motion: no-preference) {
    .sp-edge-draw {
        stroke-dasharray: 1;
        stroke-dashoffset: 1;
        animation: sp-draw 0.7s ease-out forwards;
    }

    .sp-e1 { animation-delay: 0.35s; }
    .sp-e2 { animation-delay: 0.5s; }

    .sp-edge-open {
        animation: sp-fade 0.4s ease-out 0.45s both;
    }

    .sp-node {
        transform-box: fill-box;
        transform-origin: center;
        animation: sp-pop 0.45s cubic-bezier(0.2, 0.9, 0.3, 1.25) both;
    }

    .sp-node-me   { animation-delay: 0s; }
    .sp-node-blue { animation-delay: 0.2s; }
    .sp-node-pink { animation-delay: 0.3s; }
    .sp-node-open { animation-delay: 0.45s; }
}

/* ==========================================================================
   2) CO MŮŽEME VYTVOŘIT
   ========================================================================== */
.sp-create {
    list-style: none;
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 48px 32px;
}

.sp-create li {
    text-align: center;
}

.sp-ico {
    display: grid;
    place-items: center;
    width: 64px;
    height: 64px;
    margin: 0 auto 20px;
    border-radius: 50%;
    background: var(--sp-blue-tint);
    color: var(--sp-blue);
    font-size: 1.5rem;
}

.sp-create h3 {
    font-size: 1.3rem;
    margin: 0 0 8px;
    padding: 0;
}

.sp-create p {
    color: var(--sp-muted);
    max-width: 24ch;
    margin: 0 auto;
}

/* ==========================================================================
   3) S KÝM SPOLUPRACUJI – dvě karty spojené hranou
   ========================================================================== */
.sp-chain {
    max-width: 760px;
    margin: 0 auto;
}

.sp-partner {
    --partner: var(--sp-blue);
    --partner-tint: var(--sp-blue-tint);
    background: #ffffff;
    border: 1px solid var(--sp-line);
    border-top: 5px solid var(--partner);
    border-radius: 20px;
    padding: 32px 36px 28px;
    scroll-margin-top: 110px;
}

.sp-partner-pink {
    --partner: var(--sp-pink);
    --partner-tint: var(--sp-pink-tint);
}

.sp-partner-head {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 20px;
    margin-bottom: 18px;
}

.sp-partner h3 {
    font-size: clamp(1.4rem, 3vw, 1.75rem);
    margin: 0 0 4px;
    padding: 0;
}

.sp-partner-role {
    margin: 0;
    font-weight: 600;
    color: var(--partner);
}

/* Logo: dočasně monogram. Na místo textu lze vložit <img src="…" alt="…"> */
.sp-logo {
    flex: 0 0 72px;
    display: grid;
    place-items: center;
    width: 72px;
    height: 72px;
    border-radius: 16px;
    background: var(--partner-tint);
    color: var(--partner);
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 1.5rem;
    overflow: hidden;
}

.sp-logo img {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

.sp-partner-text {
    color: var(--sp-muted);
    line-height: 1.7;
    max-width: 60ch;
    margin: 0;
}

.sp-partner-foot {
    margin-top: 22px;
    text-align: right;
}

.sp-more {
    font-family: var(--font-display);
    font-weight: 700;
    color: var(--partner);
    text-decoration: underline;
    text-decoration-color: transparent;
    text-underline-offset: 4px;
    transition: text-decoration-color 0.2s ease;
}

.sp-more:hover {
    text-decoration-color: currentColor;
}

/* hrana mezi partnery: přechází z modré do růžové, uprostřed je vrchol */
.sp-link {
    position: relative;
    width: 4px;
    height: 80px;
    margin: 0 auto;
    border-radius: 2px;
    background: linear-gradient(to bottom, var(--sp-blue), var(--sp-pink));
}

.sp-link::after {
    content: "";
    position: absolute;
    left: 50%;
    top: 50%;
    width: 20px;
    height: 20px;
    transform: translate(-50%, -50%);
    background: #ffffff;
    border: 4px solid var(--sp-ink);
    border-radius: 50%;
}

/* ==========================================================================
   4) JAK SPOLUPRÁCE PROBÍHÁ – skutečná posloupnost, proto číslování
   ========================================================================== */
.sp-steps {
    --gap: 96px;
    --arrow: 40px;
    list-style: none;
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0 var(--gap);
    max-width: 960px;
    margin: 0 auto;
}

.sp-steps li {
    position: relative;
    text-align: center;
}

.sp-num {
    display: block;
    margin-bottom: 16px;
    font-family: var(--font-display);
    font-weight: 300;
    font-size: 3.25rem;
    line-height: 1;
    color: var(--sp-ink);
}

.sp-steps h3 {
    font-size: 1.35rem;
    margin: 0 0 8px;
    padding: 0;
}

.sp-steps p {
    color: var(--sp-muted);
    max-width: 26ch;
    margin: 0 auto;
}

/* šipka mezi kroky */
.sp-steps li + li::before {
    content: "";
    position: absolute;
    top: 25px;
    left: calc((var(--gap) + var(--arrow)) / -2);
    width: var(--arrow);
    height: 2px;
    background: var(--sp-open);
}

.sp-steps li + li::after {
    content: "";
    position: absolute;
    top: 21px;
    left: calc(var(--gap) / -2 + var(--arrow) / 2 - 10px);
    width: 10px;
    height: 10px;
    border-top: 2px solid var(--sp-open);
    border-right: 2px solid var(--sp-open);
    transform: rotate(45deg);
}

/* ==========================================================================
   5) VÝZVA K AKCI
   ========================================================================== */
.sp-cta-wrap {
    padding: 0 0 clamp(56px, 8vw, 96px);
    scroll-margin-top: 90px;
}

.sp-cta {
    background-color: var(--sp-ink);
    background-image:
        linear-gradient(rgba(255, 255, 255, 0.06) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.06) 1px, transparent 1px);
    background-size: 32px 32px;
    border-radius: 28px;
    padding: clamp(48px, 8vw, 88px) clamp(24px, 6vw, 64px);
    text-align: center;
    color: #ffffff;
}

.sp-cta .sp-cta-title {
    color: #ffffff;
    font-size: clamp(1.7rem, 4vw, 2.6rem);
    margin: 0 0 16px;
    padding: 0;
}

.sp-cta .sp-cta-title::after {
    display: none;
}

.sp-cta-text {
    color: #cbd5e1;
    font-size: 1.1rem;
    margin: 0 0 32px;
}

.sp-cta .sp-btn:focus-visible,
.sp-cta-mail a:focus-visible {
    outline-color: #ffffff;
}

.sp-cta-mail {
    margin: 24px 0 0;
}

.sp-cta-mail a {
    color: #ffffff;
    text-decoration: underline;
    text-underline-offset: 4px;
}

/* ==========================================================================
   RESPONZIVITA
   ========================================================================== */
@media (max-width: 900px) {
    .sp-create {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .sp-steps {
        --gap: 56px;
        --arrow: 28px;
    }
}

@media (max-width: 860px) {
    .sp-hero-grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .sp-graph {
        max-width: 380px;
    }
}

/* kroky pod sebou: šipky míří dolů */
@media (max-width: 720px) {
    .sp-steps {
        grid-template-columns: 1fr;
        gap: 72px 0;
    }

    .sp-steps li + li::before {
        top: -56px;
        left: calc(50% - 1px);
        width: 2px;
        height: 36px;
    }

    .sp-steps li + li::after {
        top: -30px;
        left: calc(50% - 5px);
        border-top: 0;
        border-bottom: 2px solid var(--sp-open);
    }
}

@media (max-width: 600px) {
    /* Dost místa na to, aby nadpis nezajížděl pod fixní navigaci */
    .sp-hero {
        padding-top: 100px;
    }

    .sp-hero-grid {
        gap: 24px;
    }

    .sp-create {
        grid-template-columns: 1fr;
    }

    .sp-title {
        margin-bottom: 40px;
    }

    .sp-partner {
        padding: 24px 22px 22px;
    }

    .sp-logo {
        flex-basis: 56px;
        width: 56px;
        height: 56px;
        font-size: 1.2rem;
        border-radius: 14px;
    }

    .sp-link {
        height: 60px;
    }

    .sp-cta {
        border-radius: 22px;
    }
}