/* ============================================
   DESIGN TOKENS — "The Ethereal Architect"
   ============================================ */
:root {
    /* Surface hierarchy */
    --surface: #f9f9fc;
    --surface-container-lowest: #ffffff;
    --surface-container-low: #f2f3f7;
    --surface-container: #eceef3;
    --surface-container-high: #e6e8ed;
    --surface-container-highest: #e0e2e7;

    /* Primary */
    --primary: #005eb6;
    --primary-container: #5f9efb;
    --on-primary: #ffffff;

    /* Secondary */
    --secondary: #5a5e71;
    --on-secondary: #ffffff;

    /* Tertiary */
    --tertiary-container: #f4bdce;
    --on-tertiary-container: #3e0021;

    /* Text */
    --on-surface: #2e3338;
    --on-surface-variant: #6b7280;
    --outline-variant: #aeb2b8;

    /* Shadows */
    --shadow-ambient: rgba(46, 51, 56, 0.05);

    /* Spacing scale */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-10: 3rem;
    --space-12: 4rem;
    --space-16: 5.5rem;
    --space-20: 7rem;

    /* Border radius */
    --radius-md: 0.375rem;
    --radius-lg: 0.5rem;
    --radius-xl: 0.75rem;
    --radius-full: 9999px;

    /* Typography */
    --font-display: 'Manrope', sans-serif;
    --font-body: 'Inter', sans-serif;

    /* Container */
    --container-max: 1200px;
    --container-padding: 1.5rem;
}

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

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
    max-width: 100%;
}

body {
    font-family: var(--font-body);
    color: var(--on-surface);
    background-color: var(--surface);
    line-height: 1.6;
    font-size: 1rem;
}

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

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

ul {
    list-style: none;
}

/* ============================================
   UTILITY
   ============================================ */
.section-label {
    display: block;
    font-family: var(--font-body);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--primary);
    margin-bottom: var(--space-3);
}

.section-title {
    font-family: var(--font-display);
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 800;
    letter-spacing: -0.02em;
    color: var(--on-surface);
    line-height: 1.15;
    margin-bottom: var(--space-8);
}

/* ============================================
   BUTTONS
   ============================================ */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-family: var(--font-body);
    font-size: 0.875rem;
    font-weight: 600;
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius-full);
    border: none;
    cursor: pointer;
    transition: all 0.3s ease;
    white-space: nowrap;
}

.btn--primary {
    background: linear-gradient(135deg, var(--primary), var(--primary-container));
    color: var(--on-primary);
}

.btn--primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 40px rgba(0, 94, 182, 0.25);
}

.btn--secondary {
    background: transparent;
    color: var(--on-surface);
    border: none;
}

.btn--secondary:hover {
    background: var(--surface-container-highest);
}

.btn--youtube {
    background: #ff0000;
    color: #ffffff;
}

.btn--youtube:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 40px rgba(255, 0, 0, 0.25);
}

.btn--youtube svg {
    color: #ffffff;
}

/* ============================================
   NAVIGATION
   ============================================ */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    background: rgba(249, 249, 252, 0.7);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    transition: box-shadow 0.3s ease;
}

.nav--scrolled {
    box-shadow: 0 1px 0 var(--surface-container);
}

.nav__container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--container-padding);
    display: flex;
    align-items: center;
    height: 4rem;
    gap: var(--space-8);
}

.nav__logo {
    font-family: var(--font-display);
    font-size: 1.125rem;
    font-weight: 800;
    color: var(--on-surface);
    letter-spacing: -0.02em;
}

.nav__links {
    display: flex;
    gap: var(--space-6);
    margin-left: auto;
}

.nav__links a {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--on-surface-variant);
    transition: color 0.2s ease;
}

.nav__links a:hover {
    color: var(--on-surface);
}

.nav__cta {
    padding: 0.5rem 1.25rem;
    font-size: 0.8125rem;
}

.nav__toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
    margin-left: auto;
}

.nav__toggle span {
    display: block;
    width: 22px;
    height: 2px;
    background: var(--on-surface);
    border-radius: 2px;
    transition: all 0.3s ease;
}

/* ============================================
   HERO
   ============================================ */
.hero {
    padding-top: calc(4rem + var(--space-16));
    padding-bottom: var(--space-16);
    background: var(--surface);
    overflow: hidden;
}

.hero__container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--container-padding);
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-12);
    align-items: center;
}

.hero__label {
    display: inline-block;
    font-family: var(--font-body);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--primary);
    margin-bottom: var(--space-4);
}

.hero__title {
    font-family: var(--font-display);
    font-size: clamp(2.5rem, 5vw, 3.75rem);
    font-weight: 800;
    letter-spacing: -0.02em;
    line-height: 1.1;
    color: var(--on-surface);
    margin-bottom: var(--space-6);
}

.hero__title em {
    font-style: italic;
    color: var(--primary);
}

.hero__description {
    font-size: 1.0625rem;
    line-height: 1.7;
    color: var(--on-surface-variant);
    max-width: 520px;
    margin-bottom: var(--space-8);
}

.hero__actions {
    display: flex;
    gap: var(--space-4);
    flex-wrap: wrap;
    margin-bottom: var(--space-6);
}

.hero__newsletter-link {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--primary);
    transition: opacity 0.2s;
}

.hero__newsletter-link:hover {
    opacity: 0.7;
}

.hero__image {
    position: relative;
}

.hero__image img {
    border-radius: var(--radius-xl);
    width: 100%;
    height: auto;
    object-fit: cover;
}

/* ============================================
   OFERTA
   ============================================ */
.oferta {
    padding: var(--space-20) 0;
    background: var(--surface-container-low);
}

.oferta__container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--container-padding);
}

.oferta__grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-6);
}

.oferta__card {
    background: var(--surface-container-lowest);
    border-radius: var(--radius-xl);
    padding: var(--space-10);
    transition: box-shadow 0.3s ease, transform 0.3s ease;
}

.oferta__card:hover {
    transform: translateY(-4px);
    box-shadow: 0 10px 40px var(--shadow-ambient);
}

.oferta__card-icon {
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--surface-container-low);
    border-radius: var(--radius-lg);
    color: var(--primary);
    margin-bottom: var(--space-6);
}

.oferta__card-title {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: -0.01em;
    margin-bottom: var(--space-2);
}

.oferta__card-subtitle {
    display: block;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--secondary);
    margin-bottom: var(--space-4);
}

.oferta__card-text {
    font-size: 0.9375rem;
    line-height: 1.7;
    color: var(--on-surface-variant);
    margin-bottom: var(--space-6);
}

.oferta__card-link {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--primary);
    transition: opacity 0.2s;
}

.oferta__card-link:hover {
    opacity: 0.7;
}

/* Wide card (Konsultacje) */
.oferta__card--wide {
    grid-column: 1 / -1;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-10);
    align-items: center;
    padding: var(--space-10);
}

.oferta__card--wide .oferta__card-content {
    /* text side */
}

.oferta__card-image img {
    border-radius: var(--radius-xl);
    width: 100%;
    height: 100%;
    min-height: 400px;
    object-fit: cover;
    object-position: center center;
}

/* ============================================
   YOUTUBE
   ============================================ */
.youtube {
    padding: var(--space-20) 0;
    background: var(--surface);
}

.youtube__container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--container-padding);
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-12);
    align-items: center;
}

.youtube__embed {
    position: relative;
    padding-bottom: 56.25%;
    height: 0;
    overflow: hidden;
    border-radius: var(--radius-xl);
    background: var(--surface-container);
}

.youtube__embed iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

.youtube__text {
    font-size: 1.0625rem;
    line-height: 1.7;
    color: var(--on-surface-variant);
    margin-bottom: var(--space-8);
}

/* ============================================
   NEWSLETTER
   ============================================ */
.newsletter {
    padding: var(--space-20) 0;
    background: var(--surface-container-low);
}

.newsletter__container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: var(--space-12) var(--container-padding);
    background: var(--surface-container-lowest);
    border-radius: var(--radius-xl);
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-10);
    align-items: center;
}

.newsletter__text {
    font-size: 1rem;
    line-height: 1.7;
    color: var(--on-surface-variant);
}

.newsletter__form-group {
    display: flex;
    gap: var(--space-3);
}

.newsletter__input {
    flex: 1;
    padding: 0.75rem 1.25rem;
    border: none;
    border-radius: var(--radius-full);
    background: var(--surface-container-low);
    font-family: var(--font-body);
    font-size: 0.9375rem;
    color: var(--on-surface);
    outline: none;
    transition: background 0.2s, box-shadow 0.2s;
}

.newsletter__input::placeholder {
    color: var(--on-surface-variant);
}

.newsletter__input:focus {
    background: var(--surface-container-lowest);
    box-shadow: 0 0 0 1.5px rgba(174, 178, 184, 0.2);
}

.newsletter__disclaimer {
    font-size: 0.75rem;
    color: var(--on-surface-variant);
    margin-top: var(--space-3);
}

/* ============================================
   FOOTER
   ============================================ */
.footer {
    padding: var(--space-12) 0 var(--space-8);
    background: var(--surface-container);
}

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

.footer__top {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: var(--space-10);
    padding-bottom: var(--space-8);
}

.footer__logo {
    font-family: var(--font-display);
    font-size: 1.25rem;
    font-weight: 800;
    color: var(--on-surface);
    letter-spacing: -0.02em;
}

.footer__tagline {
    font-size: 0.875rem;
    color: var(--on-surface-variant);
    margin-top: var(--space-2);
}

.footer__links h4,
.footer__contact h4 {
    font-family: var(--font-display);
    font-size: 0.8125rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--on-surface);
    margin-bottom: var(--space-4);
}

.footer__links ul {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
}

.footer__links a {
    font-size: 0.875rem;
    color: var(--on-surface-variant);
    transition: color 0.2s;
}

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

.footer__email {
    display: block;
    font-size: 0.875rem;
    color: var(--primary);
    font-weight: 500;
    margin-bottom: var(--space-4);
}

.footer__socials {
    display: flex;
    gap: var(--space-3);
}

.footer__socials a {
    color: var(--on-surface-variant);
    transition: color 0.2s;
}

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

.footer__bottom {
    padding-top: var(--space-8);
    text-align: center;
    font-size: 0.8125rem;
    color: var(--on-surface-variant);
}

/* ============================================
   RESPONSIVE
   ============================================ */
@media (max-width: 768px) {
    :root {
        --container-padding: 1.25rem;
    }

    /* Prevent horizontal overflow on mobile */
    .hero__container,
    .oferta__container,
    .oferta__card--wide,
    .youtube__container,
    .newsletter__container,
    .footer__container {
        overflow: hidden;
    }

    .hero__content,
    .hero__image,
    .oferta__card,
    .oferta__card-content,
    .youtube__content,
    .youtube__video,
    .newsletter__content,
    .newsletter__form-wrapper {
        min-width: 0;
    }

    /* Mobile nav */
    .nav__toggle {
        display: flex;
    }

    .nav__links {
        position: fixed;
        top: 4rem;
        left: 0;
        right: 0;
        background: rgba(249, 249, 252, 0.95);
        backdrop-filter: blur(16px);
        -webkit-backdrop-filter: blur(16px);
        flex-direction: column;
        padding: var(--space-6) var(--container-padding);
        gap: var(--space-4);
        transform: translateY(-120%);
        visibility: hidden;
        transition: transform 0.3s ease, visibility 0.3s ease;
    }

    .nav__links--open {
        transform: translateY(0);
        visibility: visible;
    }

    .nav__cta {
        display: none;
    }

    /* Hero */
    .hero {
        padding-top: calc(4rem + var(--space-4));
        padding-bottom: var(--space-4);
    }

    .hero__container {
        grid-template-columns: 1fr;
        gap: var(--space-4);
    }

    .hero__content {
        order: 1;
    }

    .hero__image {
        order: 0;
    }

    .hero__title {
        font-size: clamp(1.75rem, 7vw, 2.25rem);
        margin-bottom: var(--space-3);
    }

    .hero__description {
        font-size: 0.9375rem;
        margin-bottom: var(--space-4);
    }

    .hero__actions {
        margin-bottom: var(--space-3);
    }

    /* Oferta */
    .oferta {
        padding: var(--space-8) 0;
    }

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

    .oferta__card--wide {
        grid-template-columns: 1fr;
    }

    .oferta__card-image {
        order: -1;
    }

    .oferta__card-image img {
        height: 300px;
        min-height: auto;
        object-position: center 0%;
    }

    /* YouTube */
    .youtube__container {
        grid-template-columns: 1fr;
        gap: var(--space-8);
    }

    /* Newsletter */
    .newsletter__container {
        grid-template-columns: 1fr;
        gap: var(--space-6);
        padding: var(--space-8) var(--space-6);
    }

    .newsletter__form-group {
        flex-direction: column;
    }

    /* Footer */
    .footer__top {
        grid-template-columns: 1fr;
        gap: var(--space-6);
    }
}

/* Tablet adjustments */
@media (min-width: 769px) and (max-width: 1024px) {
    .hero__container {
        gap: var(--space-8);
    }

    .hero__title {
        font-size: clamp(2rem, 4vw, 3rem);
    }
}

/* ============================================
   ANIMATIONS
   ============================================ */
@media (prefers-reduced-motion: no-preference) {
    .hero__image img,
    .oferta__card,
    .youtube__video,
    .newsletter__container {
        opacity: 0;
        transform: translateY(24px);
        animation: fadeUp 0.6s ease forwards;
    }

    .hero__image img { animation-delay: 0.1s; }
    .oferta__card:nth-child(1) { animation-delay: 0.1s; }
    .oferta__card:nth-child(2) { animation-delay: 0.2s; }
    .oferta__card:nth-child(3) { animation-delay: 0.3s; }

    @keyframes fadeUp {
        to {
            opacity: 1;
            transform: translateY(0);
        }
    }
}