/* ==========================================================================
   WALNOR DESIGN SYSTEM - VERSION 1 (COMPLETE INTEGRATED)
   ========================================================================== */

/* FONT - Musí být striktně na prvním řádku souboru */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

/* RESET */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* ROOT COLORS */
:root {
    /* Backgrounds */
    --bg: #141618;
    --panel: #1C1F23;
    /* Text */
    --text: #F3F6FA;
    --text-soft: #AEB7C2;
    /* Accent (Engineering Teal) */
    --accent: #4FD1C5;
    /* Borders */
    --border: rgba(255, 255, 255, 0.06);
}

/* BODY */
body {
    font-family: 'Inter', sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    font-size: 16px;
    overflow-x: hidden; /* Pojistka proti přetečení prvků do stran */
}

/* LINKS */
a {
    color: inherit;
    text-decoration: none;
}

/* HEADINGS */
h1 {
    font-size: 56px;
    font-weight: 700;
    letter-spacing: -1px;
    line-height: 1.1;
}

h2 {
    font-size: 36px;
    font-weight: 600;
}

h3 {
    font-size: 22px;
    font-weight: 600;
}

/* PARAGRAPH */
p {
    color: var(--text-soft);
    font-size: 18px;
}

/* CONTAINER */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* SIMPLE UTILITIES */
.muted { color: var(--text-soft); }
.accent { color: var(--accent); }


/* ==========================================================================
   INTERAKCE, TLAČÍTKA A TRANSFORMAČNÍ ROZHRANÍ
   ========================================================================== */

/* Společný základ pro plynulé chování prvků */
.project-card,
.service-card,
.project,
.process-step,
.language-button {
    transition: transform 0.3s cubic-bezier(0.25, 0.8, 0.25, 1),
                border-color 0.3s ease,
                background-color 0.3s ease,
                box-shadow 0.3s ease;
    backface-visibility: hidden; /* Ochrana proti rozmazávání textu */
}

/* BUTTONS BASE - Podpora pro obě varianty tvé syntaxe */
.button, .primary-button, .secondary-button {
    display: inline-block;
    padding: 14px 28px;
    border-radius: 10px;
    font-weight: 500;
    text-align: center;
    cursor: pointer;
    transition: all 0.25s cubic-bezier(0.25, 0.8, 0.25, 1), transform 0.2s ease, opacity 0.2s ease;
    backface-visibility: hidden;
}

/* PRIMARY BUTTON */
.button-primary, .primary-button {
    background: var(--accent);
    color: #0B0F12;
    border: 1px solid var(--accent);
}

.button-primary:hover, .primary-button:hover {
    opacity: 0.85;
    transform: translateY(-2px); /* Jemný prémiový nadzvedávací efekt */
}

/* SECONDARY BUTTON */
.button-secondary, .secondary-button {
    border: 1px solid var(--border);
    color: var(--text);
    background: transparent;
}

.button-secondary:hover, .secondary-button:hover {
    border-color: var(--accent);
    color: var(--accent);
    transform: translateY(-2px);
}

/* Hmatová odezva při aktivním kliknutí na libovolné tlačítko */
.button:active, .primary-button:active, .secondary-button:active {
    transform: scale(0.98) translateY(0);
}


/* ==========================================================================
   LAYOUT STRÁNKY (NAVBAR, HERO, SECTIONS, GRIDS)
   ========================================================================== */

/* NAVBAR - Výška bezpečně upravena pro stabilní desktop rozvržení */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100px;
    z-index: 1000;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 48px;
    background: rgba(20, 22, 24, 0.75);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px); /* Podpora Safari */
    border-bottom: 1px solid rgba(255, 255, 255, 0.04);
}

/* LOGO - Výrazné zvětšení na PC (šířka 240px), výška se dopočítá automaticky */
.nav-logo {
    width: 240px;
    height: auto;
    display: block;
}

.navbar nav {
    display: flex;
    align-items: center;
    gap: 36px;
}

/* Text odkazů v menu doladěn k většímu navbaru */
.navbar nav a {
    color: var(--text-soft);
    font-size: 16px;
    font-weight: 500;
    transition: color 0.25s ease;
}

.navbar nav a:hover,
.navbar nav a.active {
    color: var(--accent); /* Aktivní stránka a hover svítí inženýrským tealem */
}

/* HERO - Přidáno bezpečné odsazení a upravený strop kontejneru */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: 140px;
    padding-bottom: 100px;
    position: relative;
    overflow: hidden;
}

.hero .container {
    width: 100%;
    margin-top: 60px;
}

/* HERO BACKGROUND GLOW EFFECTS */
.hero::before {
    content: "";
    position: absolute;
    width: 700px;
    height: 700px;
    background: radial-gradient(circle, rgba(0,255,180,0.12) 0%, rgba(0,255,180,0.04) 35%, transparent 70%);
    top: -200px;
    right: -200px;
    z-index: 1;
    pointer-events: none;
}

.hero::after {
    content: "";
    position: absolute;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(0,120,255,0.10) 0%, transparent 70%);
    bottom: -200px;
    left: -120px;
    z-index: 1;
    pointer-events: none;
}

.hero-content {
    max-width: 760px;
    position: relative;
    z-index: 2; /* Nad glow efekty */
}

.hero-content h1 { margin-bottom: 28px; }
.hero-content p { max-width: 620px; margin-bottom: 42px; }
.hero-buttons { display: flex; gap: 18px; flex-wrap: wrap; }

/* SECTIONS */
section { padding: 120px 0; }
.section-title { margin-bottom: 56px; }

/* SERVICES GRID & CARD */
.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 28px;
}

.service-card {
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 42px;
    min-height: 220px;
}

.service-card h3 { margin-bottom: 18px; }
.service-card p { font-size: 16px; }

/* INŽENÝRSKÝ PROCES (PROCESS SEQUENCE LAYOUT) */
.process-sequence {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 32px;
    margin-top: 20px;
}

.step-number {
    display: block;
    font-size: 32px;
    font-weight: 700;
    color: var(--accent);
    margin-bottom: 12px;
    opacity: 0.8;
}

.process-step h4 {
    font-size: 18px;
    margin-bottom: 10px;
    color: var(--text);
}

.process-step p {
    font-size: 14px;
    color: var(--text-soft);
    line-height: 1.6;
}

/* HOMEPAGE STATICKÝ GRID */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
    gap: 32px;
}

.project-card {
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: 16px;
    overflow: hidden;
}

.project-card img {
    width: 100%;
    height: 240px;
    object-fit: cover;
    display: block;
}

.project-content { padding: 28px; }
.project-content h3 { margin-bottom: 16px; }


/* ==========================================================================
   DYNAMIC PROJECTS ACCORDION ENGINE (Propojení s projects.js)
   ========================================================================== */

.projects-container {
    display: flex;
    flex-direction: column;
    gap: 16px;
    max-width: 900px;
    margin: 0 auto;
}

.project {
    background: var(--panel); 
    border: 1px solid var(--border);
    border-radius: 16px;
    overflow: hidden;
}

.project:hover {
    transform: translateY(-4px); 
    border-color: rgba(79, 209, 197, 0.3); /* Jemné podsvícení okraje do tealu */
}

.project.active {
    border-color: var(--accent);
    background: rgba(28, 31, 35, 0.8);
}

.project-header {
    display: flex;
    gap: 20px;
    padding: 20px;
    cursor: pointer;
    align-items: center;
    user-select: none;
}

.project-header img {
    width: 120px;
    height: 70px; /* Definovaná výška drží formát napříč načítáním */
    border-radius: 10px;
    object-fit: cover;
}

.project-header h3 {
    margin: 0;
}

/* Volitelný nápis napravo "Zobrazit detail" */
.project-header .muted {
    margin-left: auto;
    font-size: 14px;
    transition: color 0.25s ease;
}

.project-header:hover .muted {
    color: var(--accent);
}

.project-body {
    max-height: 0;
    overflow: hidden;
    padding: 0 20px;
    opacity: 0;
    transition: max-height 0.35s ease-out, opacity 0.25s ease;
}

/* Aktivní stav řízený přes JS */
.project.active .project-body {
    opacity: 1;
    padding: 10px 20px 25px 140px; /* Široké odsazení zleva lícuje text s koncem loga */
}


/* ==========================================================================
   KONTAKTNÍ FORMULÁŘ & FOOTER (Propojení s form.js)
   ========================================================================== */

#contact-form {
    display: flex;
    flex-direction: column;
    gap: 20px;
    max-width: 580px;
    margin: 0 auto;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.form-group label {
    font-size: 14px;
    font-weight: 500;
    color: var(--text-soft);
}

#contact-form input,
#contact-form textarea {
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 14px 18px;
    color: var(--text);
    font-family: inherit;
    font-size: 15px;
    transition: border-color 0.25s ease, background-color 0.25s ease;
}

#contact-form input:focus,
#contact-form textarea:focus {
    outline: none;
    border-color: var(--accent);
    background: rgba(255, 255, 255, 0.04);
}

.form-status {
    display: none;
    font-size: 15px;
    font-weight: 500;
    padding: 12px;
    border-radius: 8px;
    margin-top: 10px;
    animation: fadeInStatus 0.3s ease forwards;
}

.form-status.success {
    display: block;
    background: rgba(79, 209, 197, 0.1);
    color: var(--accent);
    border: 1px solid rgba(79, 209, 197, 0.2);
}

.form-status.error {
    display: block;
    background: rgba(255, 107, 107, 0.1);
    color: #FF6B6B;
    border: 1px solid rgba(255, 107, 107, 0.2);
}

@keyframes fadeInStatus {
    from { opacity: 0; transform: translateY(-5px); }
    to { opacity: 1; transform: translateY(0); }
}

.spinner {
    display: inline-block;
    width: 16px;
    height: 16px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: #fff;
    animation: spin 0.8s linear infinite;
    margin-right: 8px;
    vertical-align: middle;
}

@keyframes spin { to { transform: rotate(360deg); } }

/* FOOTER */
footer {
    margin-top: 120px;
    border-top: 1px solid rgba(255, 255, 255, 0.04);
    padding: 60px 0;
}

.footer-links { display: flex; flex-wrap: wrap; gap: 28px; }
.footer-links a { color: var(--text-soft); transition: color 0.25s ease; }
.footer-links a:hover { color: var(--accent); }


/* ==========================================================================
   LANGUAGE PAGE (Rozcestník)
   ========================================================================== */

.language-page {
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
}

.language-container { text-align: center; }
.language-logo { width: 240px; margin: 0 auto 40px; display: block; }
.language-buttons { margin-top: 40px; display: flex; justify-content: center; gap: 18px; }

.language-button {
    padding: 16px 32px;
    border-radius: 12px;
    border: 1px solid var(--border);
    color: var(--text-soft);
    font-weight: 500;
}

.language-button:hover {
    border-color: var(--accent);
    background: rgba(79, 209, 197, 0.05);
    color: var(--accent);
    transform: translateY(-4px);
}


/* ==========================================================================
   SCROLL ANIMATION ENGINE (Bezpečné řešení)
   ========================================================================== */

/* Výchozí stav: Vše je viditelné! Web bude fungovat, i kdyby vypadl proud. */
.reveal-prep {
    opacity: 1;
    transform: translateY(0);
}

/* Teprve až JS potvrdí, že je připraven, bezpečně elementy skryje pro animaci */
.js-enabled .reveal-prep {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.8s cubic-bezier(0.16, 1, 0.3, 1), 
                transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
    will-change: transform, opacity;
}

/* Stav po scrollování: JavaScript prvek odhalí */
.js-enabled .reveal-prep.reveal-visible {
    opacity: 1 !important;
    transform: translateY(0) !important;
}


/* Stav vyvolaný přes JavaScript IntersectionObserver */
.reveal-visible {
    opacity: 1 !important;
    transform: translateY(0) !important;
}


/* ==========================================================================
   WALNOR RESPONSIVE SYSTEM
   ========================================================================== */

/* LARGE DESKTOP */
@media (max-width: 1400px) {
    .container { max-width: 1100px; }
}

/* DESKTOP */
@media (max-width: 1200px) {
    h1 { font-size: 48px; }
    h2 { font-size: 32px; }
    .hero-content { max-width: 680px; }
}

/* SMALL DESKTOP / TABLET - Zachování responzivního menu na menších PC */
@media (max-width: 980px) {
    .navbar { padding: 16px 20px; height: 80px; gap: 18px; align-items: center; }
    .nav-logo { width: 180px; height: auto; } /* Responzivně zmenšená šířka loga */
    .navbar nav { gap: 24px; flex-wrap: wrap; justify-content: center; }
    .navbar nav a { font-size: 15px; }
    .hero { text-align: center; padding-top: 140px; padding-bottom: 80px; }
    .hero .container { margin-top: 20px; }
    .hero-content { margin: 0 auto; }
    .hero-content p { margin-left: auto; margin-right: auto; }
    .hero-buttons { display: flex; justify-content: center; gap: 16px; }
    
    .services-grid, .projects-grid, .process-sequence {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .project.active .project-body {
        padding: 10px 20px 25px 140px;
    }
}

/* MOBILE - KONTROLA: Bezpečné rozměry loga i textu na telefonu */
@media (max-width: 768px) {
    h1 { font-size: 38px; }
    h2 { font-size: 28px; }
    p { font-size: 16px; }
    section { padding: 60px 0; }
    .navbar { padding: 16px 20px; height: auto; flex-direction: column; gap: 14px; }
    .nav-logo { width: 145px; height: auto; } /* Ideální kompaktní šířka na mobil */
    .navbar nav { gap: 18px; }
    .navbar nav a { font-size: 15px; }
    .hero { min-height: auto; padding-top: 120px; padding-bottom: 60px; }
    .hero .container { margin-top: 0; }
    .hero-content h1 { margin-bottom: 16px; }
    .hero-content p { margin-bottom: 28px; }
    .service-card, .project-card { padding: 20px; }
    
    .project.active .project-body {
        padding: 10px 20px 25px 20px;
    }
}

/* SMALL MOBILE */
@media (max-width: 480px) {
    h1 { font-size: 32px; }
    h2 { font-size: 24px; }
    .navbar nav { gap: 12px; }
    .navbar nav a { font-size: 14px; }
    .hero-buttons { flex-direction: column; gap: 12px; }
    .button, .primary-button, .secondary-button { width: 100%; }
    
    /* Přeskládání hlavičky projektu pod sebe */
    .project-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 12px;
        padding: 20px;
    }
    .project-header img {
        width: 64px;
        height: 64px;
    }
    .project-header .muted {
        margin-left: 0;
        font-size: 13px;
    }
    .project.active .project-body {
        padding: 0 20px 20px 20px;
    }
   }