/* ============================================
   FAKVIO.CZ — PREZENTAČNÍ WEB
   Styly pro statický prezentační web.

   Barevné schéma:
   - Primární:    #7C3AED (fialová)
   - Hover:       #6D28D9 (tmavší fialová)
   - Akcent:      #A78BFA (světlá fialová)
   - Pozadí 1:    #FAF5FF (jemně fialové)
   - Pozadí 2:    #FFFFFF (bílá)
   - Text tmavý:  #1F2937
   - Text šedý:   #6B7280
============================================ */

/* ---- CSS CUSTOM PROPERTIES (proměnné) ---- */
:root {
    --color-primary: #7C3AED;
    --color-primary-hover: #6D28D9;
    --color-accent: #A78BFA;
    --color-bg-light: #FAF5FF;
    --color-bg-white: #FFFFFF;
    --color-text: #1F2937;
    --color-text-light: #6B7280;
    --color-border: #E5E7EB;

    --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen,
        Ubuntu, Cantarell, "Fira Sans", "Droid Sans", "Helvetica Neue", sans-serif;

    --max-width: 1120px;
    --header-height: 72px;
    --border-radius: 12px;
    --border-radius-sm: 8px;

    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.12);

    --transition: 0.2s ease;
}

/* ---- RESET & BASE ---- */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    /* Offset pro fixní header při scroll-to-anchor */
    scroll-padding-top: var(--header-height);
}

body {
    font-family: var(--font-family);
    color: var(--color-text);
    line-height: 1.6;
    background-color: var(--color-bg-white);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

a {
    color: inherit;
    text-decoration: none;
}

ul {
    list-style: none;
}

img {
    max-width: 100%;
    display: block;
}

/* ---- UTILITY: Container ---- */
/* Centrovaný kontejner s maximální šířkou a paddingem */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
}

/* ---- UTILITY: Section titles ---- */
/* Společný styl pro nadpisy sekcí */
.section__title {
    font-size: 2rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 8px;
    color: var(--color-text);
}

.section__subtitle {
    font-size: 1.125rem;
    color: var(--color-text-light);
    text-align: center;
    margin-bottom: 48px;
    max-width: 560px;
    margin-left: auto;
    margin-right: auto;
}

/* ---- UTILITY: Buttons ---- */
/* Hlavní CTA tlačítka — primární fialová barva */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    border: none;
    border-radius: var(--border-radius-sm);
    cursor: pointer;
    transition: background-color var(--transition), transform var(--transition);
    text-decoration: none;
    white-space: nowrap;
}

.btn:hover {
    transform: translateY(-1px);
}

.btn:active {
    transform: translateY(0);
}

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

.btn--primary:hover {
    background-color: var(--color-primary-hover);
}

.btn--sm {
    font-size: 0.875rem;
    padding: 8px 20px;
}

.btn--lg {
    font-size: 1.0625rem;
    padding: 14px 32px;
    border-radius: var(--border-radius);
}


/* ============================================
   HEADER / NAVIGACE
   Fixní horní navigace s logem, odkazy, CTA
   a hamburger menu pro mobilní zařízení.
============================================ */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--header-height);
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    z-index: 100;
    border-bottom: 1px solid var(--color-border);
}

.nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
}

/* Logo — textové, tučné, fialové */
.nav__logo {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--color-primary);
    letter-spacing: -0.5px;
}

/* Navigační menu — na desktopu inline, na mobilu skryté */
.nav__menu {
    display: flex;
    align-items: center;
    gap: 32px;
}

.nav__link {
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--color-text-light);
    transition: color var(--transition);
}

.nav__link:hover {
    color: var(--color-primary);
}

/* CTA tlačítko v navigaci — desktop verze */
.nav__cta-desktop {
    margin-left: 8px;
}

/* CTA v mobilním menu — skryté na desktopu */
.nav__cta-mobile {
    display: none;
}

/* Hamburger tlačítko — skryté na desktopu */
.nav__toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}

.nav__toggle-bar {
    display: block;
    width: 24px;
    height: 2px;
    background-color: var(--color-text);
    border-radius: 2px;
    transition: transform var(--transition), opacity var(--transition);
}

/* Animace hamburger → X při otevřeném menu */
.nav__toggle.active .nav__toggle-bar:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}

.nav__toggle.active .nav__toggle-bar:nth-child(2) {
    opacity: 0;
}

.nav__toggle.active .nav__toggle-bar:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}


/* ============================================
   HERO SEKCE
   Hlavní sekce "above the fold" s nadpisem,
   podnadpisem a CTA tlačítkem.
============================================ */
.hero {
    position: relative;
    overflow: hidden;
    padding: 160px 0 100px;
    background-color: var(--color-bg-light);
}

/* Dekorativní gradient/tvar na pozadí hero sekce */
.hero__bg-shape {
    position: absolute;
    top: -200px;
    right: -200px;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, var(--color-accent) 0%, transparent 70%);
    opacity: 0.25;
    border-radius: 50%;
    pointer-events: none;
}

.hero__content {
    position: relative;
    text-align: center;
    max-width: 720px;
}

.hero__title {
    font-size: 3rem;
    font-weight: 800;
    line-height: 1.15;
    margin-bottom: 24px;
    letter-spacing: -1px;
}

/* Zvýrazněný text v nadpisu — fialová barva */
.hero__title--highlight {
    color: var(--color-primary);
}

.hero__subtitle {
    font-size: 1.25rem;
    color: var(--color-text-light);
    line-height: 1.7;
    margin-bottom: 36px;
}

.hero__actions {
    display: flex;
    justify-content: center;
    gap: 16px;
}


/* ============================================
   VLASTNOSTI (FEATURES)
   Grid s kartami pro jednotlivé vlastnosti.
============================================ */
.features {
    padding: 96px 0;
    background-color: var(--color-bg-white);
}

/* 4-sloupcový grid na desktopu, 2 na tabletu, 1 na mobilu */
.features__grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

/* Karta vlastnosti — ikona, nadpis, popis */
.feature-card {
    background: var(--color-bg-white);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    padding: 32px 24px;
    transition: box-shadow var(--transition), transform var(--transition);
}

.feature-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-4px);
}

.feature-card__icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 56px;
    height: 56px;
    border-radius: var(--border-radius-sm);
    background-color: var(--color-bg-light);
    color: var(--color-primary);
    margin-bottom: 16px;
}

.feature-card__title {
    font-size: 1.0625rem;
    font-weight: 600;
    margin-bottom: 8px;
}

.feature-card__text {
    font-size: 0.9375rem;
    color: var(--color-text-light);
    line-height: 1.6;
}


/* ============================================
   JAK TO FUNGUJE (HOW IT WORKS)
   3 kroky zobrazené vedle sebe s čísly a ikonami.
============================================ */
.how-it-works {
    padding: 96px 0;
    background-color: var(--color-bg-light);
}

.steps {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
}

.step {
    text-align: center;
    position: relative;
}

/* Číslo kroku — velké fialové číslo */
.step__number {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background-color: var(--color-primary);
    color: #fff;
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 20px;
}

.step__icon {
    color: var(--color-accent);
    margin-bottom: 16px;
}

.step__title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 8px;
}

.step__text {
    font-size: 0.9375rem;
    color: var(--color-text-light);
    line-height: 1.6;
    max-width: 300px;
    margin: 0 auto;
}


/* ============================================
   PRO KOHO JE FAKVIO (FOR WHOM)
   3 cílové skupiny s ikonami a popisem.
============================================ */
.for-whom {
    padding: 96px 0;
    background-color: var(--color-bg-white);
}

.audience__grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}

.audience-card {
    text-align: center;
    padding: 40px 24px;
    border-radius: var(--border-radius);
    border: 1px solid var(--color-border);
    transition: box-shadow var(--transition), transform var(--transition);
}

.audience-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-4px);
}

.audience-card__icon {
    color: var(--color-primary);
    margin-bottom: 20px;
}

.audience-card__title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 8px;
}

.audience-card__text {
    font-size: 0.9375rem;
    color: var(--color-text-light);
    line-height: 1.6;
}


/* ============================================
   ZDARMA / CENÍK (PRICING)
   Výrazná sekce s kartou zdůrazňující, že
   produkt je zdarma.
============================================ */
.pricing {
    padding: 96px 0;
    background-color: var(--color-bg-light);
}

/* Hlavní "pricing" karta — vycentrovaná, výrazná */
.pricing__card {
    max-width: 560px;
    margin: 0 auto;
    background: var(--color-bg-white);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-lg);
    padding: 48px 40px;
    text-align: center;
    border: 2px solid var(--color-primary);
}

/* Odznak "Zdarma" — fialový badge nad kartou */
.pricing__badge {
    display: inline-block;
    background-color: var(--color-primary);
    color: #fff;
    font-size: 0.875rem;
    font-weight: 700;
    padding: 6px 20px;
    border-radius: 20px;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 20px;
}

.pricing__title {
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: 12px;
}

.pricing__subtitle {
    font-size: 1rem;
    color: var(--color-text-light);
    margin-bottom: 32px;
}

/* Seznam zahrnutých funkcí s fajfkami */
.pricing__features {
    text-align: left;
    margin-bottom: 36px;
}

.pricing__feature {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 0;
    font-size: 0.9375rem;
    color: var(--color-text);
    border-bottom: 1px solid var(--color-border);
}

.pricing__feature:last-child {
    border-bottom: none;
}

.pricing__feature svg {
    flex-shrink: 0;
    color: var(--color-primary);
}

.pricing__cta {
    width: 100%;
}


/* ============================================
   FAQ
   Accordion s otázkami a odpověďmi.
   Otevírání/zavírání řeší JavaScript.
============================================ */
.faq {
    padding: 96px 0;
    background-color: var(--color-bg-white);
}

.faq__list {
    max-width: 700px;
    margin: 0 auto;
}

.faq__item {
    border-bottom: 1px solid var(--color-border);
}

/* Tlačítko otázky — kliknutím se otevře/zavře odpověď */
.faq__question {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    padding: 20px 0;
    background: none;
    border: none;
    cursor: pointer;
    font-size: 1.0625rem;
    font-weight: 600;
    color: var(--color-text);
    text-align: left;
    font-family: inherit;
    transition: color var(--transition);
}

.faq__question:hover {
    color: var(--color-primary);
}

/* Šipka (chevron) — rotuje při otevření */
.faq__chevron {
    flex-shrink: 0;
    transition: transform var(--transition);
    color: var(--color-text-light);
}

/* Otevřený stav — šipka se otočí o 180° */
.faq__item.active .faq__chevron {
    transform: rotate(180deg);
}

/* Odpověď — skrytá ve výchozím stavu */
.faq__answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
}

.faq__answer p {
    padding: 0 0 20px;
    font-size: 0.9375rem;
    color: var(--color-text-light);
    line-height: 1.7;
}


/* ============================================
   FOOTER / PATIČKA
============================================ */
.footer {
    background-color: var(--color-text);
    color: #fff;
    padding-top: 64px;
}

.footer__content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 40px;
    padding-bottom: 40px;
}

/* Logo a popis v patičce */
.footer__logo {
    font-size: 1.5rem;
    font-weight: 800;
    color: #fff;
    display: inline-block;
    margin-bottom: 12px;
}

.footer__desc {
    font-size: 0.875rem;
    color: rgba(255, 255, 255, 0.6);
    line-height: 1.6;
    max-width: 320px;
}

.footer__heading {
    font-size: 0.875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 16px;
    color: rgba(255, 255, 255, 0.8);
}

.footer__links ul {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.footer__links a {
    font-size: 0.875rem;
    color: rgba(255, 255, 255, 0.6);
    transition: color var(--transition);
}

.footer__links a:hover {
    color: #fff;
}

/* Spodní lišta patičky s copyrightem */
.footer__bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding: 20px 24px;
    font-size: 0.8125rem;
    color: rgba(255, 255, 255, 0.4);
    text-align: center;
}


/* ============================================
   RESPONSIVE DESIGN
   Mobile-first úpravy pro menší obrazovky.
============================================ */

/* ---- Tablet (max 1024px) ---- */
@media (max-width: 1024px) {
    .features__grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* ---- Mobil (max 768px) ---- */
@media (max-width: 768px) {
    /* Menší nadpisy na mobilu */
    .section__title {
        font-size: 1.625rem;
    }

    .section__subtitle {
        font-size: 1rem;
        margin-bottom: 36px;
    }

    /* ---- NAVIGACE na mobilu ---- */
    /* Menu se zobrazí jako fullscreen overlay */
    .nav__menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 75%;
        max-width: 320px;
        height: 100vh;
        background: var(--color-bg-white);
        flex-direction: column;
        align-items: flex-start;
        padding: 100px 32px 32px;
        gap: 24px;
        box-shadow: var(--shadow-lg);
        transition: right 0.3s ease;
        z-index: 99;
    }

    /* Otevřené mobilní menu */
    .nav__menu.active {
        right: 0;
    }

    .nav__link {
        font-size: 1.125rem;
    }

    /* CTA v mobilním menu zobrazíme, v desktopu skryjeme */
    .nav__cta-mobile {
        display: block;
        margin-top: 16px;
    }

    .nav__cta-desktop {
        display: none;
    }

    /* Hamburger zobrazíme na mobilu */
    .nav__toggle {
        display: flex;
        z-index: 101;
    }

    /* ---- HERO na mobilu ---- */
    .hero {
        padding: 130px 0 72px;
    }

    .hero__title {
        font-size: 2rem;
    }

    .hero__subtitle {
        font-size: 1.0625rem;
    }

    .hero__bg-shape {
        width: 350px;
        height: 350px;
        top: -100px;
        right: -100px;
    }

    /* ---- FEATURES grid na mobilu — 1 sloupec ---- */
    .features__grid {
        grid-template-columns: 1fr;
    }

    .features {
        padding: 72px 0;
    }

    /* ---- KROKY na mobilu — 1 sloupec ---- */
    .steps {
        grid-template-columns: 1fr;
        gap: 48px;
    }

    .how-it-works {
        padding: 72px 0;
    }

    /* ---- CÍLOVÉ SKUPINY na mobilu — 1 sloupec ---- */
    .audience__grid {
        grid-template-columns: 1fr;
    }

    .for-whom {
        padding: 72px 0;
    }

    /* ---- PRICING na mobilu ---- */
    .pricing {
        padding: 72px 0;
    }

    .pricing__card {
        padding: 36px 24px;
    }

    .pricing__title {
        font-size: 1.5rem;
    }

    /* ---- FAQ na mobilu ---- */
    .faq {
        padding: 72px 0;
    }

    /* ---- FOOTER na mobilu — 1 sloupec ---- */
    .footer__content {
        grid-template-columns: 1fr;
        gap: 32px;
    }
}

/* ---- Malé mobily (max 480px) ---- */
@media (max-width: 480px) {
    .hero__title {
        font-size: 1.75rem;
    }

    .hero__subtitle {
        font-size: 1rem;
    }

    .btn--lg {
        width: 100%;
        padding: 14px 24px;
    }
}