:root {
    --bg-dark: #0b1017;
    --bg-muted: #151d27;
    --bg-accent: linear-gradient(135deg, #1d365d, #0f1e34);
    --primary: #4ea9ff;
    --secondary: #ff8a3d;
    --text-primary: #f5f7fa;
    --text-muted: #b2bdcd;
    --card-border: rgba(78, 169, 255, 0.15);
    --shadow: 0 24px 60px rgba(12, 18, 26, 0.45);
    --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Poppins', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--bg-dark);
    color: var(--text-primary);
    line-height: 1.6;
}

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

ul, ol {
    list-style: none;
}

.container {
    width: min(1100px, calc(100% - 2.5rem));
    margin: 0 auto;
}

.hero {
    position: relative;
    padding: 3.5rem 0 4.5rem;
    overflow: hidden;
    background: radial-gradient(circle at top right, rgba(78, 169, 255, 0.2), transparent 45%), var(--bg-dark);
}

.hero::before {
    content: "";
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, rgba(78, 169, 255, 0.08), transparent 60%);
    pointer-events: none;
}

.hero__content {
    position: relative;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2.5rem;
    align-items: stretch;
}

.hero__logo {
    position: absolute;
    top: 2rem;
    left: 2rem;
    display: flex;
    align-items: center;
    gap: 0.8rem;
    z-index: 100;
}

.hero__logo-icon {
    font-size: 2rem;
    filter: drop-shadow(0 4px 12px rgba(78, 169, 255, 0.5));
}

.hero__logo-text {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: -0.02em;
}

.hero__text h1 {
    font-size: clamp(3.5rem, 6vw, 5.5rem);
    margin-bottom: 1.5rem;
    font-weight: 800;
    letter-spacing: -0.03em;
    line-height: 1.1;
    background: linear-gradient(135deg, var(--primary), #fff);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero__text p {
    color: var(--text-muted);
    max-width: 38rem;
    margin-bottom: 1.8rem;
}

.hero__cta {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    margin-bottom: 1.6rem;
}

.button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1.6rem;
    border-radius: 12px;
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    border: none;
    transition: transform var(--transition), box-shadow var(--transition), background var(--transition);
}

.button--primary {
    background: linear-gradient(135deg, var(--primary), #1f68b3);
    color: #0b111b;
    box-shadow: 0 16px 40px rgba(78, 169, 255, 0.3);
}

.button--primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 24px 50px rgba(78, 169, 255, 0.35);
}

.button--ghost {
    background: rgba(78, 169, 255, 0.08);
    color: var(--primary);
    border: 1px solid rgba(78, 169, 255, 0.25);
}

.button--ghost:hover {
    background: rgba(78, 169, 255, 0.15);
}

.button--secondary {
    background: linear-gradient(135deg, var(--secondary), #c76a21);
    color: #140d09;
    box-shadow: 0 16px 40px rgba(255, 138, 61, 0.35);
}

.hero__benefits {
    display: grid;
    gap: 0.6rem;
    color: var(--text-muted);
    font-size: 0.95rem;
}

.hero__benefits li::before {
    content: "✔";
    margin-right: 0.5rem;
    color: var(--secondary);
}

.hero__card {
    position: relative;
    padding: 2rem;
    border-radius: 20px;
    background: var(--bg-muted);
    border: 1px solid rgba(255, 255, 255, 0.06);
    box-shadow: var(--shadow);
    display: flex;
    flex-direction: column;
    gap: 0.8rem;
    max-width: 420px;
}

.hero__card h2 {
    font-size: 1.5rem;
}

.hero__card p {
    color: var(--text-muted);
}

.hero__card strong {
    color: var(--text-primary);
}

.hero__contact {
    display: grid;
    gap: 0.5rem;
    margin: 0.8rem 0;
}

.hero__contact a {
    display: inline-flex;
    align-items: center;
    gap: 0.6rem;
    padding: 0.6rem 1rem;
    border-radius: 10px;
    background: rgba(78, 169, 255, 0.08);
    border: 1px solid rgba(78, 169, 255, 0.2);
    transition: background var(--transition), transform var(--transition);
}

.hero__contact a:hover {
    background: rgba(78, 169, 255, 0.18);
    transform: translateX(4px);
}

.hero__availability {
    font-size: 0.9rem;
    color: var(--text-muted);
}

/* Hero AI Chat - rozbaluje se v hero sekci */
.hero__ai-chat {
    position: absolute;
    bottom: -400px;
    left: 50%;
    transform: translateX(-50%);
    width: min(600px, calc(100% - 2rem));
    background: var(--bg-muted);
    border-radius: 18px;
    border: 1px solid rgba(78, 169, 255, 0.15);
    box-shadow: 0 20px 40px rgba(6, 11, 19, 0.4);
    overflow: hidden;
    display: none;
    flex-direction: column;
    max-height: 540px;
    z-index: 1000;
    transition: bottom 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.hero__ai-chat.active {
    display: flex;
    bottom: 120px;
}

.hero__menu-toggle {
    position: absolute;
    top: 1.5rem;
    right: 1.5rem;
    font-size: 1.8rem;
    background: rgba(11, 16, 23, 0.6);
    border: 1px solid rgba(255, 255, 255, 0.1);
    color: var(--text-primary);
    border-radius: 12px;
    padding: 0.4rem 0.75rem;
    cursor: pointer;
    display: none;
}

.nav {
    position: absolute;
    top: 2rem;
    right: 2rem;
    display: flex;
    gap: 1.5rem;
    font-weight: 500;
}

.nav a {
    position: relative;
    padding-bottom: 0.25rem;
}

.nav a::after {
    content: "";
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 2px;
    background: var(--primary);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform var(--transition);
}

.nav a:hover::after {
    transform: scaleX(1);
}

.section {
    padding: 4rem 0;
}

.section h2 {
    font-size: clamp(1.8rem, 3vw, 2.6rem);
    margin-bottom: 2rem;
}

.cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 1.5rem;
}

.card {
    background: var(--bg-muted);
    border-radius: 18px;
    padding: 1.8rem;
    border: 1px solid var(--card-border);
    box-shadow: 0 20px 45px rgba(6, 10, 16, 0.35);
    display: grid;
    gap: 0.9rem;
    transition: transform var(--transition), border-color var(--transition);
}

.card:hover {
    transform: translateY(-6px);
    border-color: rgba(78, 169, 255, 0.4);
}

.card h3 {
    font-size: 1.3rem;
}

.card p {
    color: var(--text-muted);
}

.card ul {
    display: grid;
    gap: 0.5rem;
    color: var(--text-muted);
    font-size: 0.95rem;
}

.card ul li::before {
    content: "•";
    color: var(--primary);
    margin-right: 0.5rem;
}

.section--accent {
    background: var(--bg-accent);
}

.process {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 2rem;
    align-items: start;
}

.process__steps {
    display: grid;
    gap: 1.5rem;
}

.process__steps li {
    background: rgba(12, 18, 26, 0.5);
    padding: 1.5rem;
    border-radius: 16px;
    border: 1px solid rgba(78, 169, 255, 0.15);
    position: relative;
    display: grid;
    gap: 0.6rem;
}

.process__steps span {
    position: absolute;
    top: -18px;
    left: 1.5rem;
    width: 36px;
    height: 36px;
    display: grid;
    place-items: center;
    border-radius: 12px;
    background: var(--secondary);
    color: #1b120c;
    font-weight: 700;
    box-shadow: 0 12px 30px rgba(255, 138, 61, 0.3);
}

.process__steps h3 {
    margin-top: 0.2rem;
}

.process__steps p {
    color: var(--text-muted);
}

.process__note {
    background: rgba(255, 138, 61, 0.12);
    border-radius: 20px;
    padding: 2rem;
    border: 1px solid rgba(255, 138, 61, 0.25);
    box-shadow: 0 20px 40px rgba(255, 138, 61, 0.2);
    display: grid;
    gap: 1rem;
}

.process__note p {
    color: var(--text-muted);
}

.ai {
    display: grid;
    gap: 2.5rem;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    align-items: start;
}

.ai__content p {
    color: var(--text-muted);
    margin-bottom: 1rem;
}

.ai__actions {
    display: flex;
    flex-wrap: wrap;
    gap: 0.8rem;
    margin-bottom: 1rem;
}

.ai__disclaimer {
    font-size: 0.85rem;
    color: rgba(178, 189, 205, 0.7);
}

.ai__preview {
    background: var(--bg-muted);
    border-radius: 18px;
    border: 1px solid rgba(78, 169, 255, 0.15);
    box-shadow: 0 20px 40px rgba(6, 11, 19, 0.4);
    overflow: hidden;
    display: none;
    flex-direction: column;
    max-height: 540px;
}

.ai__preview.active {
    display: flex;
}

.ai__header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1.2rem 1.5rem;
    border-bottom: 1px solid rgba(78, 169, 255, 0.12);
}

.ai__header button {
    font-size: 1.6rem;
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
}

.ai__header button:hover {
    color: var(--secondary);
}

.ai__messages {
    padding: 1.5rem;
    display: grid;
    gap: 1rem;
    overflow-y: auto;
    max-height: 320px;
}

.ai__message {
    padding: 1rem 1.2rem;
    border-radius: 14px;
    background: rgba(78, 169, 255, 0.08);
    border: 1px solid rgba(78, 169, 255, 0.15);
}

.ai__message--user {
    background: rgba(255, 138, 61, 0.12);
    border-color: rgba(255, 138, 61, 0.3);
}

.ai__message--loading {
    opacity: 0.7;
    animation: pulse 1.5s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 0.7; }
    50% { opacity: 1; }
}

.ai__form {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 0.8rem;
    padding: 1.5rem;
    border-top: 1px solid rgba(78, 169, 255, 0.12);
}

.ai__form input {
    padding: 0.75rem 1rem;
    border-radius: 12px;
    border: 1px solid rgba(255, 255, 255, 0.08);
    background: rgba(11, 16, 23, 0.65);
    color: var(--text-primary);
}

.ai__form button {
    padding: 0.75rem 1.4rem;
    border-radius: 12px;
    border: none;
    background: var(--primary);
    color: #0b111b;
    font-weight: 600;
    cursor: pointer;
}

.section--dark {
    background: #070b11;
}

.contact {
    display: grid;
    gap: 2.5rem;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    align-items: start;
}

.contact__text p {
    color: var(--text-muted);
    margin-bottom: 1rem;
}

.contact__list {
    display: grid;
    gap: 0.8rem;
    color: var(--text-muted);
}

.contact__list a {
    color: var(--primary);
}

.contact__form {
    display: grid;
    gap: 0.8rem;
    padding: 2rem;
    border-radius: 18px;
    background: rgba(11, 16, 23, 0.75);
    border: 1px solid rgba(78, 169, 255, 0.12);
    box-shadow: 0 18px 40px rgba(5, 8, 13, 0.4);
}

.contact__form label {
    font-weight: 600;
}

.contact__form input,
.contact__form textarea {
    padding: 0.75rem 1rem;
    border-radius: 12px;
    border: 1px solid rgba(255, 255, 255, 0.08);
    background: rgba(7, 11, 17, 0.85);
    color: var(--text-primary);
    font-family: inherit;
    resize: vertical;
}

.contact__form textarea {
    min-height: 140px;
}

.contact__form button {
    margin-top: 0.4rem;
}

.contact__privacy {
    font-size: 0.8rem;
    color: rgba(178, 189, 205, 0.65);
}

.footer {
    padding: 2rem 0;
    background: #05070c;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
}

.footer__content {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    justify-content: space-between;
    align-items: center;
    color: rgba(178, 189, 205, 0.7);
}

.footer__content a {
    color: var(--primary);
    font-weight: 600;
}

@media (max-width: 900px) {
    .nav {
        position: fixed;
        inset: 0;
        background: rgba(7, 11, 17, 0.92);
        backdrop-filter: blur(12px);
        flex-direction: column;
        justify-content: center;
        align-items: center;
        gap: 1.8rem;
        transform: translateY(-100%);
        transition: transform var(--transition);
        z-index: 1200;
    }

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

    .hero__menu-toggle {
        display: block;
        z-index: 1300;
    }

    body.nav-open {
        overflow: hidden;
    }
}

@media (max-width: 768px) {
    .hero {
        padding-top: 6.5rem;
    }

    .hero__logo {
        top: 1.5rem;
        left: 1.5rem;
    }

    .hero__logo-icon {
        font-size: 1.5rem;
    }

    .hero__logo-text {
        font-size: 1rem;
    }

    .hero__text h1 {
        font-size: clamp(2.5rem, 8vw, 3.5rem);
    }

    .hero__card {
        max-width: none;
    }

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

    .process__note {
        order: -1;
    }
}

@media (max-width: 520px) {
    .hero__cta {
        flex-direction: column;
    }

    .button {
        width: 100%;
    }

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

    .ai__form button {
        width: 100%;
    }
}