/* Hallmark · pre-emit critique: P4 H4 E4 S4 R4 V4 */

/* ── Design Tokens ────────────────────────────── */
:root {
    --color-primary:           #4a90e2;
    --color-primary-hover:     #357abd;
    --color-interactive:       #4a90e2;
    --color-interactive-hover: #357abd;
    --color-accent:            #ffdd57;
    --color-body-bg:           #f4f4f4;
    --color-surface:           #ffffff;
    --color-text:              #333333;
    --color-text-muted:        #555555;
    --color-border:            #e9ecef;
    --color-hero-start:        #6a11cb;
    --color-hero-end:          #4a90e2;
    --color-download-bg:       #8cb6ec;
    --color-download-text:     #1a365d;
    --color-footer-bg:         #333333;
    --color-footer-text:       #ffffff;
    --color-footer-link:       #ffdd57;
    --font-body:    'Open Sans', Arial, sans-serif;
    --font-heading: 'Roboto', Arial, sans-serif;
}

@media (prefers-color-scheme: dark) {
    :root {
        --color-primary:           #60a5fa;
        --color-primary-hover:     #93c5fd;
        --color-interactive:       #1e3a5f;
        --color-interactive-hover: #2d4a6f;
        --color-accent:            #fde047;
        --color-body-bg:           #111827;
        --color-surface:           #1e293b;
        --color-text:              #e2e8f0;
        --color-text-muted:        #94a3b8;
        --color-border:            #2d3748;
        --color-hero-start:        #3b0764;
        --color-hero-end:          #1d4ed8;
        --color-download-bg:       #1e3a5f;
        --color-download-text:     #93c5fd;
        --color-footer-bg:         #0f172a;
        --color-footer-text:       #e2e8f0;
        --color-footer-link:       #fde047;
    }
}

/* ── Reset ────────────────────────────────────── */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    background-color: var(--color-body-bg);
    overflow-x: clip;
}

body {
    font-family: var(--font-body);
    line-height: 1.8;
    background-color: var(--color-body-bg);
    color: var(--color-text);
    padding: 1rem;
    overflow-x: clip;
}

/* ── Focus ────────────────────────────────────── */
a:focus-visible,
button:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 3px;
    border-radius: 2px;
}

/* ── Navbar ───────────────────────────────────── */
.navbar {
    background-color: var(--color-interactive);
    color: white;
    padding: 1rem;
    position: relative;
    font-weight: bold;
}

.navbar ul {
    list-style-type: none;
    display: flex;
    justify-content: space-around;
}

.navbar a {
    color: white;
    text-decoration: none;
    transition: color 0.3s ease;
}

.navbar a:hover {
    color: var(--color-accent);
}

/* ── Hero ─────────────────────────────────────── */
.hero {
    background: linear-gradient(135deg, var(--color-hero-start) 0%, var(--color-hero-end) 100%);
    color: white;
    text-align: center;
    padding: 4rem 2rem;
    border-radius: 8px;
    margin-bottom: 2rem;
}

.hero h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    overflow-wrap: anywhere;
    min-width: 0;
    color: white;
}

.hero p {
    font-size: 1.2rem;
}

/* ── Main Content ─────────────────────────────── */
main {
    background: var(--color-surface);
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    margin-bottom: 2rem;
}

h1, h2 {
    color: var(--color-primary);
    margin-bottom: 1rem;
    font-family: var(--font-heading);
    overflow-wrap: anywhere;
    min-width: 0;
}

p {
    margin-bottom: 1.5rem;
    line-height: 1.7;
}

/* ── Hamburger ────────────────────────────────── */
.menu-toggle {
    display: none;
    background: none;
    border: none;
    padding: 0.5rem;
    cursor: pointer;
    position: absolute;
    right: 1rem;
    top: 0.7rem;
}

.hamburger {
    display: block;
    position: relative;
    width: 24px;
    height: 2px;
    background: white;
    transition: all 0.3s ease-in-out;
}

.hamburger::before,
.hamburger::after {
    content: '';
    position: absolute;
    width: 24px;
    height: 2px;
    background: white;
    transition: all 0.3s ease-in-out;
}

.hamburger::before { transform: translateY(-7px); }
.hamburger::after  { transform: translateY(7px); }

.menu-toggle.active .hamburger { background: transparent; }
.menu-toggle.active .hamburger::before { transform: rotate(45deg); }
.menu-toggle.active .hamburger::after  { transform: rotate(-45deg); }

/* ── Welcome Section ──────────────────────────── */
.welcome-section {
    max-width: 800px;
    margin: 0 auto 2rem;
    font-size: 1.1rem;
    color: var(--color-text-muted);
}

.welcome-section a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color 0.3s ease;
}

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

/* ── Accordion ────────────────────────────────── */
.accordion {
    max-width: 800px;
    margin: 2rem auto;
    padding: 0 1rem;
}

.accordion > h2 {
    margin-top: 2rem;
    padding-bottom: 0.25rem;
    border-bottom: 1px solid var(--color-border);
}

.accordion-item {
    margin-bottom: 1rem;
    border: 1px solid var(--color-border);
    border-radius: 4px;
    overflow: hidden;
}

.accordion-header {
    width: 100%;
    padding: 1rem;
    background: var(--color-interactive);
    color: white;
    border: none;
    text-align: left;
    font-size: 1.2rem;
    font-weight: bold;
    cursor: pointer;
    transition: background-color 0.3s ease;
    display: block;
    font-family: var(--font-body);
}

.accordion-header:hover {
    background: var(--color-interactive-hover);
}

.accordion-content {
    display: none;
    padding: 1rem;
    background: var(--color-surface);
}

.accordion-item.active .accordion-content { display: block; }
.accordion-item.active .accordion-header  { background: var(--color-interactive-hover); }

ul { margin-bottom: 1.5rem; }

/* ── Download Buttons ─────────────────────────── */
.download-links {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    margin-top: 1rem;
}

.download-button {
    display: inline-block;
    padding: 0.8rem 1.2rem;
    background-color: var(--color-download-bg);
    color: var(--color-download-text);
    text-decoration: none;
    border-radius: 4px;
    transition: background-color 0.3s ease, color 0.3s ease;
    font-weight: 600;
}

.download-button:hover {
    background-color: var(--color-interactive-hover);
    color: white;
}

/* ── Footer ───────────────────────────────────── */
.footer {
    background-color: var(--color-footer-bg);
    color: var(--color-footer-text);
    text-align: center;
    padding: 1rem;
    border-radius: 8px;
    margin-top: 2rem;
}

.footer a {
    color: var(--color-footer-link);
    text-decoration: none;
}

.footer a:hover {
    color: var(--color-footer-text);
}

/* ── Scroll-to-top ────────────────────────────── */
#backToTopBtn {
    display: none;
    position: fixed;
    bottom: 20px;
    left: 30px;
    z-index: 99;
    border: none;
    outline: none;
    background-color: var(--color-interactive);
    color: white;
    cursor: pointer;
    padding: 15px;
    border-radius: 50px;
    font-size: 18px;
    transition: background-color 0.3s ease;
}

#backToTopBtn:hover {
    background-color: var(--color-interactive-hover);
}

/* ── Responsive ───────────────────────────────── */
@media screen and (max-width: 768px) {
    .hero {
        padding: 3rem 1rem;
    }

    main {
        padding: 1rem;
    }

    .accordion {
        padding: 0 0.5rem;
    }

    .accordion-header {
        padding: 0.8rem;
        font-size: 1.1rem;
    }

    .download-button {
        padding: 0.6rem 1rem;
        font-size: 0.9rem;
    }

    .menu-toggle {
        display: block;
    }

    .navbar ul {
        flex-direction: column;
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background-color: var(--color-interactive);
        padding: 0.5rem 0;
        box-shadow: 0 2px 5px rgba(0, 0, 0, 0.2);
    }

    .navbar ul.show {
        display: flex;
    }

    .navbar li {
        padding: 0.5rem 1rem;
    }

    .navbar {
        padding-right: 3rem;
    }
}