/* ==========================================================================
   Design Tokens (Swiss Design / Minimalism)
   ========================================================================== */

:root {
    /* Cosmic Swiss Palette */
    --surface: #F4F6FF;
    --surface-content: #ffffff;

    --on-surface: #0F172A;
    --on-surface-muted: #334155;
    --on-surface-weak: #64748B;

    --accent: #4F46E5;
    --border: #CBD5E1;

    --cta-bg: transparent;
    --cta-bg-hover: var(--accent);
    --cta-text: var(--accent);
    --cta-text-hover: #ffffff;
    --cta-border: var(--accent);
    
    --space-xs: 0.5rem;
    --space-s: 1rem;
    --space-m: 2rem;
    --space-l: 4rem;
    --space-xl: 8rem;

    --font-primary: 'Inter', system-ui, -apple-system, sans-serif;
    --text-measure: 65ch;
}

@media (max-width: 768px) {
    :root {
        --space-xl: 4rem;
        --space-l: 3rem;
    }
}

/* Dark Mode Support */
@media (prefers-color-scheme: dark) {
    :root {
        --surface: #020617;
        --surface-content: #1E293B;
        
        --on-surface: #F8FAFC;
        --on-surface-muted: #CBD5E1;
        --on-surface-weak: #94A3B8;
        
        --accent: #818CF8;
        --border: #334155;
        
        --cta-bg: var(--accent);
        --cta-bg-hover: color-mix(in srgb, var(--accent) 70%, white 30%);
        --cta-text: var(--surface);
        --cta-text-hover: var(--surface);
        --cta-border: var(--accent);
    }

    /* Invert navbar toggler icon to make it visible on dark background */
    .navbar-toggler-icon {
        filter: invert(1) grayscale(100%) brightness(2);
    }
}

/* ==========================================================================
   Base Clean Reset
   ========================================================================== */

::selection {
    background: var(--accent);
    color: #ffffff;
}

body {
    background-color: var(--surface);
    color: var(--on-surface);
    font-family: var(--font-primary);
    font-weight: 400;
    font-size: 18px;
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Swiss Design: Flush Left. No center align by default. */
h1,
h2,
h3,
h4,
h5,
h6,
p,
ul,
ol {
    text-align: left;
    margin-top: 0;
}

a {
    color: var(--on-surface);
    text-decoration: none;
    border-bottom: 1px solid var(--border);
    transition: all 0.2s ease;
}

a:hover {
    color: var(--accent);
    border-bottom-color: var(--accent);
    opacity: 1;
}

/* ==========================================================================
   Typography (International Typographic Style)
   ========================================================================== */

h1,
h2,
h3,
h4,
h5,
h6 {
    font-weight: 700;
    letter-spacing: -0.02em;
    line-height: 1.1;
    color: var(--on-surface);
}

h1 {
    font-size: 3.5rem;
    margin-bottom: var(--space-l);
}

@media (max-width: 768px) {
    h1 {
        font-size: 2.5rem;
    }
}

h2 {
    font-size: 2.25rem;
    margin-bottom: var(--space-m);
}

@media (max-width: 768px) {
    h2 {
        font-size: 1.75rem;
    }
}

h3 {
    font-size: 1.5rem;
    margin-bottom: var(--space-m);
}

p {
    margin-bottom: var(--space-m);
    max-width: var(--text-measure);
    color: var(--on-surface-muted);
}

.display-title {
    font-size: 4.5rem;
    font-weight: 800;
    letter-spacing: -0.04em;
    line-height: 1;
    margin-bottom: var(--space-m);
    color: var(--on-surface);
}

@media (max-width: 768px) {
    .display-title {
        font-size: 3rem;
    }
}

.lead-text {
    font-size: 1.5rem;
    font-weight: 400;
    line-height: 1.5;
    color: var(--on-surface);
    max-width: 45ch;
    margin-bottom: var(--space-m);
}

.text-muted {
    color: var(--on-surface-weak) !important;
}

.gloss-term {
    font-style: normal;
    font-weight: 600;
    letter-spacing: 0.02em;
    color: var(--accent);
    white-space: nowrap;
}

/* ==========================================================================
   Layout & Spacing
   ========================================================================== */

section {
    padding-top: var(--space-xl);
    padding-bottom: var(--space-s);
}

article {
    margin-top: var(--space-l);
}

.container {
    max-width: 1200px;
    padding-left: 2rem;
    padding-right: 2rem;
}

@media (max-width: 576px) {
    .container {
        padding-left: 1.5rem;
        padding-right: 1.5rem;
    }
    .page-intro__bg {
        padding-left: 1.5rem;
        padding-right: 1.5rem;
    }
}

/* ==========================================================================
   Components
   ========================================================================== */

/* Navbar: Minimalist */
.navbar {
    padding: var(--space-m) 0;
    background-color: var(--surface);
    border-bottom: 1px solid transparent;
}

.navbar-brand {
    font-family: var(--font-primary);
    font-weight: 800;
    font-size: 1.5rem;
    letter-spacing: -0.02em;
    color: var(--on-surface) !important;
}

.nav-link {
    color: var(--on-surface-muted) !important;
    font-size: 0.9rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-left: 2rem;
    padding: 0 !important;
    transition: color 0.2s ease;
}

.nav-link:hover,
.nav-link:focus,
.nav-link.active {
    color: var(--accent) !important;
}

.nav-link.active {
    color: var(--accent);
    font-weight: 600;
}

@media (max-width: 768px) {
    .navbar-nav {
        padding-top: var(--space-m);
    }
    
    .nav-link {
        margin-left: 0;
        margin-bottom: 1.5rem;
        font-size: 1.1rem;
    }
}

/* Buttons: Swiss Outline Style with Cosmic Accent */
.btn-custom {
    display: inline-block;
    padding: 1rem 2rem;
    border: 1px solid var(--cta-border);
    background: var(--cta-bg);
    color: var(--cta-text);
    font-size: 0.9rem;
    font-weight: 600;
    letter-spacing: 0.05em;
    transition:
        background-color 0.25s ease,
        color 0.25s ease,
        transform 0.25s ease,
        box-shadow 0.25s ease;
    margin-top: var(--space-s);
    text-decoration: none;
    border-radius: 0;
}

@media (max-width: 768px) {
    .btn-custom {
        margin-bottom: var(--space-m);
    }
}

.btn-custom:hover {
    background: var(--cta-bg-hover);
    color: var(--cta-text-hover);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(79, 70, 229, 0.25);
}

/* Intro section with background image */
.page-intro {
    position: relative;
    overflow: hidden;
}

.page-intro__bg {
    position: absolute;
    top: 0;
    bottom: 0;

    left: 50%;
    transform: translateX(-50%);
    width: min(1200px, 100%);
    box-sizing: border-box;

    z-index: 0;
    pointer-events: none;

    background-repeat: no-repeat;
    background-size: 700px;
    background-position: top right;

    opacity: var(--intro-bg-opacity, 0.085);
    filter: var(--intro-bg-filter, saturate(0.3));
}

.page-intro .container {
    position: relative;
    z-index: 1;
}

.page-intro--home .page-intro__bg {
    background-image: url("../img/mandala-1200-20260122.svg");
}

.page-intro--opracowanie .page-intro__bg {
    background-image: url("../img/opracowanie-1200-20260210.png");
    --intro-bg-opacity: 0.24;
}

@media (prefers-color-scheme: dark) {
    .page-intro--opracowanie .page-intro__bg {
        --intro-bg-opacity: 0.12;
    }
}

@media (min-width: 992px) {
    /* Hide background image below 992px */
    .hero--home {
       min-height: 600px;
    }
}

@media (max-width: 991.98px) {
    /* Hide background image below 992px */
    .page-intro__bg {
        display: none;
    }
}

/* List */
.feature-list-intro {
    margin-bottom: var(--space-xs);
}

ul.feature-list {
    list-style: none;
    padding-left: 0;
    margin-bottom: var(--space-m);
}

ul.feature-list li {
    padding: 0.6rem 0;
    padding-left: 1.75rem;
    position: relative;
    color: var(--on-surface-muted);
    line-height: 1.6;
    border-bottom: none;
}

ul.feature-list li::before {
    content: "–";
    position: absolute;
    left: 0;
    color: var(--accent);
}

ol.feature-list {
    list-style: none;
    padding-left: 0;
    margin-bottom: var(--space-m);
    counter-reset: feature;
}

ol.feature-list li {
    padding: 0.6rem 0;
    padding-left: 1.75rem;
    position: relative;
    color: var(--on-surface-muted);
    line-height: 1.6;
    border-bottom: none;
    counter-increment: feature;
}

ol.feature-list li::before {
    content: counter(feature) ".";
    position: absolute;
    left: 0;
    color: var(--accent);
    font-variant-numeric: tabular-nums;
    font-weight: 600;
}

/* Spec table */
.spec-cols {
    --bs-gutter-x: 3.5rem;
    margin-top: var(--space-l);
    margin-bottom: var(--space-l);
    padding-top: var(--space-m);
    padding-bottom: var(--space-m);
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
}

.spec-header {
    margin-bottom: var(--space-s);
}

.spec-part {
    display: block;
    font-size: 0.85rem;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    margin-top: var(--space-s);
    margin-bottom: var(--space-s);
    color: var(--on-surface-weak);
}

.spec-title {
    margin: 0;
}

.spec-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.spec-list li {
    display: flex;
    justify-content: space-between;
    gap: var(--space-s);
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--border);
}

.spec-list li:last-child {
    border-bottom: 0;
}

.spec-list li span:first-child {
    min-width: 0;
    color: var(--on-surface-muted);
}

.spec-list li span:last-child {
    flex: 0 0 auto;
    color: var(--on-surface-weak);
    font-variant-numeric: tabular-nums;
    white-space: nowrap;
}

/* Profile Photo */
.profile-photo-block {
    margin-bottom: var(--space-m);
    max-width: 240px;
}

.profile-photo {
    width: 100%;
    aspect-ratio: 1 / 1;
    overflow: hidden;
    border-radius: 50%;
    filter:
        grayscale(55%)
        sepia(40%)
        hue-rotate(200deg)
        saturate(100%)
        contrast(1.05);
    transition: filter 0.4s ease;
}

.profile-photo:hover {
    filter: none;
}

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

/* Side navigation */
.side-nav {
    font-size: 0.95rem;
    line-height: 1.6;
    color: var(--on-surface-muted);
}

.side-nav h6 {
    font-family: var(--font-primary);
    font-weight: 700;
    font-size: 0.75rem;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    margin: 0 0 var(--space-s);
    color: var(--on-surface);
}

.side-nav ul {
    list-style: none;
    padding: 0;
    margin: 0 0 var(--space-m);
}

.side-nav li {
    margin: 0 0 var(--space-xs);
}

.side-nav a {
    display: inline-block;
    color: var(--on-surface-muted);
    text-decoration: none;
    border-bottom: none;
    transition: color 0.2s ease, opacity 0.2s ease;
}

.side-nav a:hover,
.side-nav a:focus {
    color: var(--accent);
    opacity: 1;
}

.side-nav a.active {
    color: var(--accent);
    opacity: 1;
    font-weight: 600;
}

/* Contact actions */
.contact-actions {
    margin-top: var(--space-m);
    margin-bottom: var(--space-m);
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

/* Footer (Minimal) */
footer {
    margin-top: var(--space-xl);
    padding: var(--space-m) 0;
    font-size: 0.85rem;
    line-height: 1.3;
    color: var(--on-surface-muted);
    border-top: 1px solid var(--border);
}

footer p {
    margin-bottom: 0.6em;
}

footer a {
    color: var(--on-surface);
    text-decoration: none;
    border-bottom: none;
}

/* ==========================================================================
   Utilities / Helpers
   ========================================================================== */

html {
    scroll-padding-top: 7rem;
    scroll-behavior: smooth;
}

.text-white {
    color: var(--on-surface) !important;
}

.navbar-toggler {
    border-color: var(--on-surface);
}

.navbar-toggler-icon {
    /* Update SVG stroke to use Midnight Blue #0F172A (Approx rgba(15, 23, 42, 1)) */
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba(15, 23, 42, 1)' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e") !important;
}