/* ============================================
   Lehko živky — Hlavní stylesheet
   Minimalistický blog, parallax, gradienty
   ============================================ */

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

:root {
    --color-bg: #faf8f5;
    --color-text: #2c2c2c;
    --color-text-light: #6b6b6b;
    --color-heading: #1a1a1a;
    --color-accent: #8b6f47;
    --color-accent-dark: #6d5535;
    --color-accent-light: #c4a97d;
    --color-white: #ffffff;
    --color-border: #e0dbd4;
    --color-card-bg: #ffffff;
    --color-overlay: rgba(26, 26, 26, 0.55);
    --color-overlay-light: rgba(26, 26, 26, 0.3);

    --font-heading: 'Playfair Display', Georgia, serif;
    --font-body: 'Source Sans 3', 'Segoe UI', sans-serif;

    --max-width: 1200px;
    --content-width: 800px;
    --nav-height: 90px;

    --transition: 0.3s ease;
    --transition-slow: 0.6s ease;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-body);
    font-weight: 400;
    line-height: 1.7;
    color: var(--color-text);
    background-color: var(--color-bg);
    -webkit-font-smoothing: antialiased;
}

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

a:hover {
    color: var(--color-accent-dark);
}

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

h1, h2, h3, h4 {
    font-family: var(--font-heading);
    color: var(--color-heading);
    line-height: 1.3;
    font-weight: 700;
}

/* --- Navigace --- */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 0 2rem;
    height: var(--nav-height);
    display: flex;
    align-items: center;
    background: transparent;
    transition: background var(--transition), box-shadow var(--transition);
}

.nav--scrolled {
    background: rgba(250, 248, 245, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.08);
}

.nav--scrolled .nav__logo,
.nav--scrolled .nav__link {
    color: var(--color-heading);
}

.nav__container {
    width: 100%;
    max-width: var(--max-width);
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav__logo {
    display: flex;
    align-items: center;
}

.nav::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: var(--nav-height);
    background: linear-gradient(to right, rgba(255,255,255,0.85) 0%, rgba(255,255,255,0.4) 40%, transparent 65%);
    z-index: -1;
    transition: opacity var(--transition);
    pointer-events: none;
}

.nav--scrolled::before {
    opacity: 0;
}

.nav__logo-img {
    height: 70px;
    width: auto;
    transition: opacity var(--transition);
    position: relative;
    z-index: 1;
}

.nav__logo:hover .nav__logo-img {
    opacity: 0.85;
}

.nav__menu {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav__link {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--color-white);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    position: relative;
    padding: 0.25rem 0;
}

.nav__link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--color-accent-light);
    transition: width var(--transition);
}

.nav__link:hover::after,
.nav__link--active::after {
    width: 100%;
}

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

/* Hamburger */
.nav__hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 5px;
    z-index: 1001;
}

.nav__hamburger span {
    display: block;
    width: 25px;
    height: 2px;
    background: var(--color-white);
    transition: transform var(--transition), opacity var(--transition);
}

.nav--scrolled .nav__hamburger span {
    background: var(--color-heading);
}

.nav__hamburger--active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.nav__hamburger--active span:nth-child(2) {
    opacity: 0;
}

.nav__hamburger--active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* --- Hero sekce --- */
.hero {
    position: relative;
    height: 100vh;
    min-height: 600px;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    overflow: hidden;
}

.hero__bg {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
    z-index: -2;
}

.hero__overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(
        to bottom,
        rgba(26, 26, 26, 0.3) 0%,
        rgba(26, 26, 26, 0.1) 40%,
        rgba(26, 26, 26, 0.4) 70%,
        rgba(26, 26, 26, 0.7) 100%
    );
    z-index: -1;
}

.hero__content {
    position: relative;
    z-index: 1;
    color: var(--color-white);
    padding: 2rem;
}

.hero__title {
    font-family: var(--font-heading);
    font-size: clamp(2.5rem, 6vw, 5rem);
    font-weight: 700;
    color: var(--color-white);
    margin-bottom: 1rem;
    letter-spacing: 0.02em;
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
}

.hero__logo {
    max-width: 400px;
    width: 80%;
    height: auto;
    margin-bottom: 1.5rem;
}

.hero__subtitle {
    font-size: clamp(1rem, 2vw, 1.3rem);
    font-weight: 300;
    opacity: 0.9;
    margin-bottom: 2rem;
    letter-spacing: 0.05em;
    text-shadow: 0 1px 5px rgba(0, 0, 0, 0.3);
}

.hero__scroll {
    display: inline-block;
    margin-top: 2rem;
    animation: bounceDown 2s infinite;
}

.hero__scroll svg {
    width: 30px;
    height: 30px;
    fill: none;
    stroke: var(--color-white);
    stroke-width: 2;
    opacity: 0.7;
}

@keyframes bounceDown {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(10px); }
}

/* --- Hero pro podstránky (menší) --- */
.hero--small {
    height: 50vh;
    min-height: 350px;
}

.hero--small .hero__title {
    font-size: clamp(2rem, 4vw, 3.5rem);
}

/* --- Sekce --- */
.section {
    padding: 5rem 2rem;
}

.section--gray {
    background: linear-gradient(180deg, #f0ece6 0%, var(--color-bg) 100%);
}

.section--parallax {
    position: relative;
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
}

.section--parallax::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(250, 248, 245, 0.88);
}

.section--parallax > * {
    position: relative;
    z-index: 1;
}

.section__container {
    max-width: var(--max-width);
    margin: 0 auto;
}

.section__container--narrow {
    max-width: var(--content-width);
    margin: 0 auto;
}

.section__title {
    font-size: clamp(1.8rem, 3vw, 2.5rem);
    text-align: center;
    margin-bottom: 1rem;
}

.section__subtitle {
    text-align: center;
    color: var(--color-text-light);
    font-size: 1.1rem;
    margin-bottom: 3rem;
}

/* --- Karty článků --- */
.articles-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
    gap: 2rem;
}

.article-card {
    display: block;
    background: var(--color-card-bg);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.06);
    transition: transform var(--transition), box-shadow var(--transition);
    text-decoration: none;
    color: inherit;
    cursor: pointer;
}

.article-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 12px 30px rgba(0, 0, 0, 0.12);
}

.article-card__image {
    position: relative;
    height: 220px;
    overflow: hidden;
}

.article-card__image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

.article-card:hover .article-card__image img {
    transform: scale(1.05);
}

.article-card__image::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 50%;
    background: linear-gradient(to top, rgba(0,0,0,0.15), transparent);
}

.article-card__category {
    position: absolute;
    top: 1rem;
    left: 1rem;
    background: var(--color-accent);
    color: var(--color-white);
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    z-index: 1;
}

.article-card__body {
    padding: 1.5rem;
}

.article-card__date {
    font-size: 0.85rem;
    color: var(--color-text-light);
    margin-bottom: 0.5rem;
}

.article-card__title {
    font-size: 1.3rem;
    margin-bottom: 0.75rem;
    line-height: 1.4;
}

.article-card__title {
    color: var(--color-heading);
    transition: color var(--transition);
}

.article-card:hover .article-card__title {
    color: var(--color-accent);
}

.article-card__perex {
    color: var(--color-text-light);
    font-size: 0.95rem;
    line-height: 1.6;
}

.article-card__more {
    display: inline-block;
    margin-top: 1rem;
    font-weight: 600;
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.article-card__more::after {
    content: ' →';
    transition: margin-left var(--transition);
}

.article-card__more:hover::after {
    margin-left: 5px;
}

/* --- Detail článku --- */
.article-detail {
    padding-top: 2rem;
}

.article-detail__meta {
    display: flex;
    gap: 1.5rem;
    align-items: center;
    margin-bottom: 2rem;
    color: var(--color-text-light);
    font-size: 0.95rem;
}

.article-detail__category {
    background: var(--color-accent);
    color: var(--color-white);
    padding: 0.2rem 0.6rem;
    border-radius: 15px;
    font-size: 0.8rem;
    font-weight: 600;
}

.article-detail__content {
    font-size: 1.1rem;
    line-height: 1.85;
}

.article-detail__content p {
    margin-bottom: 1.5rem;
}

.article-detail__content h2 {
    font-size: 1.6rem;
    margin: 2.5rem 0 1rem;
}

.article-detail__content h3 {
    font-size: 1.3rem;
    margin: 2rem 0 0.75rem;
}

.article-detail__content blockquote {
    border-left: 4px solid var(--color-accent);
    padding: 1rem 1.5rem;
    margin: 2rem 0;
    background: rgba(139, 111, 71, 0.06);
    font-style: italic;
    border-radius: 0 8px 8px 0;
}

.article-detail__content img {
    border-radius: 8px;
    margin: 2rem 0;
}

/* Navigace článků */
.article-nav {
    display: flex;
    justify-content: space-between;
    margin-top: 4rem;
    padding-top: 2rem;
    border-top: 1px solid var(--color-border);
}

.article-nav__link {
    max-width: 45%;
}

.article-nav__label {
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--color-text-light);
    margin-bottom: 0.25rem;
}

.article-nav__title {
    font-family: var(--font-heading);
    font-size: 1.1rem;
    color: var(--color-heading);
    transition: color var(--transition);
}

.article-nav__link:hover .article-nav__title {
    color: var(--color-accent);
}

/* --- O mně --- */
.about {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 4rem;
    align-items: center;
}

.about__image {
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.12);
}

.about__image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.about__text h2 {
    font-size: 2rem;
    margin-bottom: 1.5rem;
}

.about__text p {
    margin-bottom: 1rem;
    font-size: 1.05rem;
    line-height: 1.8;
}

/* --- Knihy --- */
.books-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 2.5rem;
}

.book-card {
    display: grid;
    grid-template-columns: 180px 1fr;
    gap: 2rem;
    background: var(--color-card-bg);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.06);
    padding: 2rem;
    transition: transform var(--transition), box-shadow var(--transition);
    text-decoration: none;
    color: inherit;
    cursor: pointer;
}

.book-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

.book-card__cover {
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.15);
}

.book-card__cover img {
    width: 100%;
    height: auto;
}

.book-card__info h3 {
    font-size: 1.4rem;
    margin-bottom: 0.75rem;
}

.book-card__info h3 {
    color: var(--color-heading);
    transition: color var(--transition);
}

.book-card:hover .book-card__info h3 {
    color: var(--color-accent);
}

.book-card__desc {
    color: var(--color-text-light);
    font-size: 0.95rem;
    line-height: 1.6;
}

/* Detail knihy */
.book-detail {
    display: grid;
    grid-template-columns: 250px 1fr;
    gap: 3rem;
    align-items: start;
}

.book-detail__cover {
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
    position: sticky;
    top: calc(var(--nav-height) + 2rem);
}

.book-detail__content h2 {
    font-size: 1.4rem;
    margin: 2rem 0 1rem;
    color: var(--color-accent-dark);
}

.book-detail__content p {
    margin-bottom: 1rem;
    line-height: 1.8;
}

.book-detail__ukazka {
    background: rgba(139, 111, 71, 0.06);
    border-left: 4px solid var(--color-accent);
    padding: 2rem;
    border-radius: 0 12px 12px 0;
    margin: 2rem 0;
    font-style: italic;
}

/* --- Tlačítka --- */
.btn {
    display: inline-block;
    padding: 0.75rem 2rem;
    border: none;
    border-radius: 30px;
    font-family: var(--font-body);
    font-size: 0.95rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    cursor: pointer;
    transition: all var(--transition);
    text-align: center;
}

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

.btn--primary:hover {
    background: var(--color-accent-dark);
    color: var(--color-white);
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(139, 111, 71, 0.3);
}

.btn--outline {
    background: transparent;
    color: var(--color-white);
    border: 2px solid var(--color-white);
}

.btn--outline:hover {
    background: var(--color-white);
    color: var(--color-heading);
    transform: translateY(-2px);
}

.btn--outline-dark {
    background: transparent;
    color: var(--color-accent);
    border: 2px solid var(--color-accent);
}

.btn--outline-dark:hover {
    background: var(--color-accent);
    color: var(--color-white);
    transform: translateY(-2px);
}

/* --- Kontaktní formulář --- */
.form {
    max-width: 600px;
    margin: 0 auto;
}

.form__group {
    margin-bottom: 1.5rem;
}

.form__label {
    display: block;
    font-weight: 600;
    margin-bottom: 0.5rem;
    font-size: 0.95rem;
}

.form__input,
.form__textarea {
    width: 100%;
    padding: 0.8rem 1rem;
    border: 2px solid var(--color-border);
    border-radius: 8px;
    font-family: var(--font-body);
    font-size: 1rem;
    color: var(--color-text);
    background: var(--color-white);
    transition: border-color var(--transition), box-shadow var(--transition);
}

.form__input:focus,
.form__textarea:focus {
    outline: none;
    border-color: var(--color-accent);
    box-shadow: 0 0 0 3px rgba(139, 111, 71, 0.15);
}

.form__textarea {
    resize: vertical;
    min-height: 150px;
}

/* --- Flash zprávy --- */
.flash {
    padding: 1rem 1.5rem;
    border-radius: 8px;
    margin-bottom: 2rem;
    font-weight: 600;
}

.flash--success {
    background: #e8f5e9;
    color: #2e7d32;
    border: 1px solid #a5d6a7;
}

.flash--error {
    background: #fce4ec;
    color: #c62828;
    border: 1px solid #ef9a9a;
}

/* --- Stránkování --- */
.pagination {
    display: flex;
    justify-content: center;
    gap: 0.5rem;
    margin-top: 3rem;
}

.pagination__link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    font-weight: 600;
    color: var(--color-text);
    transition: all var(--transition);
}

.pagination__link:hover {
    background: var(--color-accent);
    color: var(--color-white);
}

.pagination__link--active {
    background: var(--color-accent);
    color: var(--color-white);
}

/* --- Filtr kategorií --- */
.category-filter {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 0.75rem;
    margin-bottom: 3rem;
}

.category-filter__link {
    padding: 0.4rem 1.2rem;
    border: 2px solid var(--color-border);
    border-radius: 25px;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--color-text-light);
    transition: all var(--transition);
}

.category-filter__link:hover,
.category-filter__link--active {
    border-color: var(--color-accent);
    background: var(--color-accent);
    color: var(--color-white);
}

/* --- Footer --- */
.footer {
    background: var(--color-heading);
    color: rgba(255, 255, 255, 0.7);
    padding: 4rem 2rem 2rem;
}

.footer__container {
    max-width: var(--max-width);
    margin: 0 auto;
}

.footer__content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 3rem;
    margin-bottom: 3rem;
}

.footer__logo-img {
    height: 80px;
    width: auto;
    margin-bottom: 0.5rem;
    transition: opacity var(--transition);
}

.footer__logo-img:hover {
    opacity: 0.85;
}

.footer__tagline {
    font-size: 0.95rem;
    opacity: 0.7;
}

.footer h4 {
    color: var(--color-white);
    font-family: var(--font-body);
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    margin-bottom: 1rem;
}

.footer__nav ul {
    list-style: none;
}

.footer__nav li {
    margin-bottom: 0.5rem;
}

.footer__nav a,
.footer__contact a {
    color: rgba(255, 255, 255, 0.7);
    transition: color var(--transition);
}

.footer__nav a:hover,
.footer__contact a:hover {
    color: var(--color-accent-light);
}

.footer__bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 2rem;
    text-align: center;
    font-size: 0.9rem;
    opacity: 0.6;
}

/* --- Fade-in animace --- */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity var(--transition-slow), transform var(--transition-slow);
}

.fade-in--visible {
    opacity: 1;
    transform: translateY(0);
}

/* --- CTA sekce --- */
.cta {
    text-align: center;
    padding: 5rem 2rem;
    position: relative;
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
}

.cta::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(139, 111, 71, 0.9), rgba(109, 85, 53, 0.95));
}

.cta > * {
    position: relative;
    z-index: 1;
}

.cta__title {
    color: var(--color-white);
    font-size: clamp(1.5rem, 3vw, 2.2rem);
    margin-bottom: 1rem;
}

.cta__text {
    color: rgba(255, 255, 255, 0.85);
    font-size: 1.1rem;
    margin-bottom: 2rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.cta .btn {
    margin: 0 0.5rem;
}

/* --- Responsive --- */
@media (max-width: 768px) {
    .nav__hamburger {
        display: flex;
    }

    .nav__menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 280px;
        height: 100vh;
        background: rgba(26, 26, 26, 0.97);
        backdrop-filter: blur(10px);
        flex-direction: column;
        justify-content: center;
        align-items: center;
        gap: 2rem;
        transition: right var(--transition);
    }

    .nav__menu--open {
        right: 0;
    }

    .nav__menu--open .nav__link {
        color: var(--color-white);
    }

    .hero__title {
        font-size: clamp(2rem, 8vw, 3rem);
    }

    .articles-grid {
        grid-template-columns: 1fr;
    }

    .about {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .book-card {
        grid-template-columns: 120px 1fr;
        gap: 1rem;
        padding: 1.5rem;
    }

    .book-detail {
        grid-template-columns: 1fr;
    }

    .book-detail__cover {
        max-width: 200px;
        margin: 0 auto;
        position: static;
    }

    .footer__content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .article-nav {
        flex-direction: column;
        gap: 1.5rem;
    }

    .article-nav__link {
        max-width: 100%;
    }

    .hero__bg {
        background-attachment: scroll;
    }

    .section--parallax {
        background-attachment: scroll;
    }

    .cta {
        background-attachment: scroll;
    }
}

@media (max-width: 480px) {
    .section {
        padding: 3rem 1.25rem;
    }

    .book-card {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .book-card__cover {
        max-width: 150px;
        margin: 0 auto;
    }

    .category-filter {
        gap: 0.5rem;
    }

    .category-filter__link {
        padding: 0.3rem 0.8rem;
        font-size: 0.8rem;
    }
}