:root {
    --primary: #FFFFFF;
    /* primary accent becomes white for dark theme */
    --accent: #F4B400;
    --text: #EDEDED;
    --muted: #B3B3B3;
    --bg: #000000;
    --white: #000000;
    /* used for headers/footers backgrounds */
    --card: #0F0F10;
    --border: #222222;
    --shadow: 0 6px 20px rgba(0, 0, 0, 0.35);
}

* {
    box-sizing: border-box;
}

html,
body {
    height: 100%;
}

body {
    margin: 0;
    font-family: "Segoe UI", Tahoma, Arial, sans-serif;
    color: var(--text);
    background: var(--bg);
    line-height: 1.6;
}

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

img {
    max-width: 100%;
    display: block;
    border-radius: 10px;
}

.container {
    width: min(1100px, calc(100% - 2rem));
    margin-inline: auto;
    padding-block: 1.5rem;
}

/* Header & Navigation */
header {
    background: var(--white);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
}

.logo {
    font-weight: 700;
    font-size: 1.1rem;
    color: var(--text);
}

.nav-links {
    display: flex;
    align-items: center;
    list-style: none;
    padding: 0;
    margin: 0;
    gap: 0.75rem;
    flex-wrap: wrap;
}

.nav-links a {
    display: inline-block;
    padding: 0.5rem 0.75rem;
    border-radius: 8px;
    color: var(--text);
}

.nav-links a:hover {
    background: #151515;
}

.nav-links a.active {
    background: var(--primary);
    color: #000;
}

/* Hero */
.hero {
    background: linear-gradient(135deg, #0B0B0B 0%, #131313 100%);
    border-bottom: 1px solid var(--border);
}

.hero-content {
    padding-block: 2.5rem;
    text-align: center;
}

.hero h1 {
    font-size: clamp(2rem, 5vw, 3rem);
    margin: 0 0 0.5rem;
}

.hero p {
    margin: 0 auto 1rem;
    color: var(--muted);
    max-width: 60ch;
}

.hero-actions {
    display: inline-flex;
    gap: 0.75rem;
    flex-wrap: wrap;
}

/* Page Header */
.page-header {
    background: #0A0A0A;
    border-bottom: 1px solid var(--border);
}

.page-header .container {
    padding-block: 1.5rem;
}

.page-header h1 {
    margin: 0 0 0.25rem;
}

.page-header p {
    margin: 0;
    color: var(--muted);
}

/* Plan page: background image with dark overlay */
.page-header.plan-bg {
    position: relative;
    background: url('kristina-loburets-a-k_H7vgGHY-unsplash.jpg') center/cover no-repeat;
}

.page-header.plan-bg::before {
    content: "";
    position: absolute;
    inset: 0;
    background: linear-gradient(to bottom, rgba(0, 0, 0, 0.5), rgba(0, 0, 0, 0.7));
}

.page-header.plan-bg .container {
    position: relative;
    z-index: 1;
}

.page-header.plan-bg h1 {
    color: #FFFFFF;
}

.page-header.plan-bg p {
    color: #E0E0E0;
}

/* Layouts */
main.container {
    padding-block: 2rem;
}

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

.grid-two {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1rem;
}

/* Cards */
.card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 1rem;
    box-shadow: var(--shadow);
    color: var(--text);
}

.card h3,
.card h2 {
    margin-top: 0;
}

/* Lists */
.list {
    padding-left: 1rem;
}

.list li {
    margin: 0.25rem 0;
    color: var(--muted);
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.6rem 1rem;
    border-radius: 10px;
    border: 1px solid var(--primary);
    font-weight: 600;
    transition: transform 0.05s ease, background 0.2s ease, color 0.2s ease;
}

.btn:hover {
    transform: translateY(-1px);
}

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

.btn-primary {
    background: var(--primary);
    color: #000;
    border-color: var(--primary);
}

.btn-outline {
    background: transparent;
    color: var(--primary);
}

.btn-link {
    padding: 0.25rem 0;
    border: none;
    color: var(--primary);
    background: transparent;
}

/* Footer */
.footer {
    border-top: 1px solid var(--border);
    background: var(--white);
}

.footer-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    flex-wrap: wrap;
    padding-block: 1rem;
}

figure.card figcaption {
    color: var(--muted);
    margin-top: 0.5rem;
    font-size: 0.9rem;
}

.footer p {
    margin: 0;
    color: var(--muted);
}

/* Ensure anchored sections don't hide under sticky header */
section {
    scroll-margin-top: 80px;
}

/* Responsive tweaks */
@media (max-width: 520px) {
    .nav {
        flex-direction: column;
        align-items: flex-start;
    }

    .hero-content {
        text-align: left;
    }
}

/* Banner and image spacing */
.banner-image {
    width: 100%;
    max-height: 420px;
    object-fit: cover;
    border-radius: 12px;
    border: 1px solid var(--border);
    box-shadow: var(--shadow);
}

.card img {
    margin-bottom: 0.5rem;
    border-radius: 10px;
    width: 100%;
    height: auto;
}

/* Clickable cards */
.card-link {
    display: block;
    color: inherit;
    text-decoration: none;
}

.card-link .card:hover {
    box-shadow: 0 6px 18px rgba(255, 255, 255, 0.12);
    transform: translateY(-2px);
    transition: box-shadow 160ms ease, transform 160ms ease;
}

/* Modal overlay (CSS-only :target) */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.7);
    opacity: 0;
    pointer-events: none;
    transition: opacity 160ms ease;
    z-index: 1000;
}

.modal-overlay:target {
    opacity: 1;
    pointer-events: auto;
}

.modal {
    box-sizing: border-box;
    max-width: 720px;
    margin: 8vh auto;
    background: #121212;
    padding: 1.25rem 1.5rem;
    border-radius: 12px;
    box-shadow: 0 16px 40px rgba(0, 0, 0, 0.55);
    color: var(--text);
}

.modal h3 {
    margin-top: 0;
}

.modal-close {
    float: right;
    font-size: 1.25rem;
    text-decoration: none;
    color: #E0E0E0;
}

.modal-close:hover {
    color: #FFFFFF;
}

/* --- Professional polish additions --- */
/* Typography scale */
h1 { font-size: clamp(2rem, 5vw, 3rem); font-weight: 700; }
h2 { font-size: clamp(1.5rem, 4vw, 2.2rem); font-weight: 700; }
h3 { font-size: clamp(1.15rem, 3vw, 1.4rem); font-weight: 600; }
p, li { font-size: 1rem; }
section > h2 { margin: 0 0 0.5rem; }
.subtitle { color: var(--muted); }

/* Focus styles for accessibility */
:focus-visible {
    outline: 3px solid var(--accent);
    outline-offset: 3px;
    border-radius: 6px;
}
.btn:focus-visible { outline-color: var(--primary); }

/* Skip link */
.skip-link {
    position: absolute;
    left: -999px;
    top: -999px;
    background: #111;
    color: #fff;
    padding: 0.5rem 0.75rem;
    border-radius: 8px;
}
.skip-link:focus { left: 1rem; top: 1rem; z-index: 2000; }

/* Minor hero refinements */
.hero-content { padding-block: 3.5rem; }
.hero h1 { margin: 0 0 0.5rem; }