nav {
    width: 100%;
    height: var(--nav-height);
    background-color: var(--nav-bg);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 24px;
    position: fixed;
    top: 0;
    left: 0;
    z-index: 1000;
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}

.brand {
    font-size: clamp(16px, 4vw, 20px);
    font-weight: bold;
    color: var(--heading-color);
    letter-spacing: 2px;
    text-transform: uppercase;
    flex-shrink: 0;
}

.theme-toggle {
    background: none;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    cursor: pointer;
    padding: 7px 9px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--heading-color);
    width: 38px;
    height: 36px;
    flex-shrink: 0;
    transition: border-color var(--transition-fast), opacity var(--transition-fast);
    position: relative;
    overflow: hidden;
}

.theme-toggle:hover {
    opacity: 0.7;
    border-color: var(--link-hover);
}

.theme-toggle svg {
    width: 18px;
    height: 18px;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    transition: opacity var(--transition-fast), transform var(--transition-med);
    pointer-events: none;
}

.icon-moon {
    opacity: 1;
    fill: currentColor;
}

.icon-sun {
    opacity: 0;
    fill: none;
    stroke: currentColor;
    stroke-width: 2;
    stroke-linecap: round;
}

body.light-mode .icon-moon { opacity: 0; }
body.light-mode .icon-sun  { opacity: 1; }

#hero-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    max-width: 700px;
    width: 100%;
    margin: auto;
    padding: 20px 0;
}

.title {
    font-size: clamp(20px, 5vw, 28px);
    color: var(--heading-color);
    margin-bottom: 25px;
    font-weight: 600;
    letter-spacing: 0.5px;
    line-height: 1.3;
}

.about-section,
.disclaimer {
    font-size: clamp(13px, 3.5vw, 14px);
    margin-bottom: 20px;
    line-height: 1.6;
    padding: 20px;
    background-color: var(--box-bg);
    border-radius: var(--radius-md);
    text-align: left;
    width: 100%;
}

.about-section {
    border-left: 4px solid var(--accent-green);
}

.disclaimer {
    border-left: 4px solid var(--accent-red);
    margin-bottom: 35px;
}

.cta-btn {
    background-color: var(--btn-bg);
    color: var(--btn-text);
    border: none;
    border-radius: var(--radius-sm);
    padding: 16px 30px;
    font-size: clamp(14px, 4vw, 15px);
    font-weight: bold;
    font-family: inherit;
    cursor: pointer;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    transition: background-color var(--transition-fast), transform var(--transition-fast);
    width: 100%;
    max-width: 350px;
    display: block;
}

.cta-btn:hover:not(:disabled) {
    background-color: var(--btn-hover);
    transform: translateY(-2px);
}

.cta-btn:disabled {
    background-color: var(--btn-disabled);
    color: var(--btn-disabled-text);
    cursor: not-allowed;
    transform: none;
}

#results-container {
    display: none;
    width: 100%;
    max-width: 900px;
    margin: 0 auto;
}

.docs {
    line-height: 1.75;
    font-size: 15px;
    font-family: var(--font-sans);
}

.docs h2 {
    font-family: var(--font-display);
    color: var(--heading-color);
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 12px;
    margin-top: 20px;
    font-size: clamp(18px, 4vw, 22px);
}

.docs h3 {
    font-family: var(--font-display);
    color: var(--heading-color);
    margin-top: 36px;
    margin-bottom: 12px;
    font-size: clamp(15px, 3.5vw, 17px);
    display: flex;
    align-items: center;
    gap: 10px;
}

.docs h3::before {
    content: "■";
    color: var(--border-color);
    font-size: 11px;
    flex-shrink: 0;
}

.docs p {
    margin-bottom: 16px;
    color: var(--text-color);
}

.docs strong {
    color: var(--heading-color);
    font-weight: 600;
}

.highlight {
    background-color: var(--highlight-bg);
    padding: 2px 6px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-color);
    font-family: var(--font-mono);
    font-size: 0.88em;
}

.docs code {
    font-family: var(--font-mono);
    font-size: 0.88em;
    background-color: var(--highlight-bg);
    padding: 2px 6px;
    border-radius: var(--radius-sm);
}

.bottom-actions {
    display: flex;
    flex-direction: column;
    align-items: center;
    margin-top: 40px;
    padding-top: 30px;
    border-top: 1px solid var(--border-color);
    gap: 15px;
}

.back-btn {
    background-color: transparent;
    color: var(--heading-color);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: 14px 40px;
    font-size: clamp(14px, 4vw, 15px);
    font-weight: bold;
    font-family: inherit;
    cursor: pointer;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    transition: background-color var(--transition-fast), color var(--transition-fast);
    width: 100%;
    max-width: 300px;
}

.back-btn:hover {
    background-color: var(--border-color);
    color: var(--bg-color);
}

.tagline {
    font-family: var(--font-brand);
    color: var(--link-color);
    font-size: 12px;
    letter-spacing: 2px;
    text-transform: uppercase;
    text-align: center;
}

@media (max-width: 600px) {
    nav {
        padding: 0 16px;
    }

    .docs {
        font-size: 14px;
    }
}