:root {
    --dark-brown: #463f3a;
    --medium-brown: #8a817c;
    --light-brown: #bcb8b1;
    --cream: #f4f3ee;
    --coral: #e0afa0;
    --white: #ffffff;
    --red: #C1666B;
    --yellow: #D4A373;
    --green: #789F90;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: var(--cream);
    color: var(--dark-brown);
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* Typography */
h1, h2, h3, h4 {
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 1rem;
}

h1 { font-size: clamp(2rem, 5vw, 3.5rem); }
h2 { font-size: clamp(1.5rem, 3.5vw, 2.5rem); }
h3 { font-size: clamp(1.2rem, 2.5vw, 1.8rem); }
h4 { font-size: clamp(1rem, 2vw, 1.3rem); }

p { margin-bottom: 1rem; }

.lead {
    font-size: 1.15rem;
    color: var(--medium-brown);
    margin-bottom: 2rem;
}

/* Navigation */
.main-nav {
    background: var(--white);
    border-bottom: 1px solid var(--light-brown);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-brand {
    font-weight: 700;
    font-size: 1.2rem;
    color: var(--dark-brown);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    text-decoration: none;
}

.nav-brand i {
    color: var(--coral);
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-menu a {
    text-decoration: none;
    color: var(--dark-brown);
    font-weight: 500;
    transition: color 0.3s ease;
    position: relative;
}

.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--coral);
    transition: width 0.3s ease;
}

.nav-menu a:hover::after,
.nav-menu a.active::after {
    width: 100%;
}

.nav-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--dark-brown);
    cursor: pointer;
}

/* Page Header */
.page-header {
    background: var(--dark-brown);
    color: var(--white);
    padding: 4rem 0 3rem;
    position: relative;
}

.page-header::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    width: 5px;
    height: 100%;
    background: var(--coral);
}

.page-header h1 {
    color: var(--white);
}

.page-header p {
    color: var(--light-brown);
    font-size: 1.1rem;
    max-width: 70ch;
}

/* Sections */
section {
    padding: 4rem 0;
}

section:nth-child(even) {
    background: var(--white);
}

.section-header {
    border-left: 4px solid var(--coral);
    padding-left: 1.5rem;
    margin-bottom: 2.5rem;
}

/* Grid */
.grid {
    display: grid;
    gap: 2rem;
    margin-top: 2rem;
}

.grid-2 { grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); }
.grid-3 { grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); }

/* Cards */
.card {
    background: var(--white);
    padding: 2rem;
    border: 1px solid var(--light-brown);
    border-left: 4px solid var(--coral);
    transition: all 0.3s ease;
}

section:nth-child(even) .card {
    background: var(--cream);
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 20px rgba(70, 63, 58, 0.1);
}

.card-icon {
    font-size: 2.5rem;
    color: var(--coral);
    margin-bottom: 1rem;
}

.card h3 {
    margin-bottom: 0.75rem;
}

.card p, .card li {
    color: var(--medium-brown);
}

.card ul {
    padding-left: 1.2rem;
    margin-top: 1rem;
}

.card li {
    margin-bottom: 0.5rem;
}

/* Traffic Light Cards */
.traffic-card {
    padding: 2rem;
    border: 3px solid;
    background: var(--white);
}

.traffic-card.red { border-color: var(--red); }
.traffic-card.yellow { border-color: var(--yellow); }
.traffic-card.green { border-color: var(--green); }

.traffic-header {
    display: inline-block;
    padding: 0.5rem 1.5rem;
    color: var(--white);
    font-weight: 700;
    font-size: 1.3rem;
    margin-bottom: 1rem;
}

.traffic-card.red .traffic-header { background: var(--red); }
.traffic-card.yellow .traffic-header { background: var(--yellow); }
.traffic-card.green .traffic-header { background: var(--green); }

/* FAQ */
.faq-item {
    background: var(--white);
    border: 1px solid var(--light-brown);
    margin-bottom: 1rem;
}

.faq-question {
    padding: 1.5rem;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-weight: 600;
    transition: background 0.3s ease;
}

.faq-question:hover {
    background: var(--cream);
}

.faq-question i {
    color: var(--coral);
    transition: transform 0.3s ease;
}

.faq-question.active i {
    transform: rotate(180deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
}

.faq-answer.active {
    max-height: 1000px;
}

.faq-content {
    padding: 0 1.5rem 1.5rem;
    color: var(--medium-brown);
}

/* Prompt Example */
.prompt-example {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    margin: 2rem 0;
}

.prompt-box {
    padding: 1.5rem;
    border-radius: 4px;
}

.prompt-bad {
    background: #fef2f2;
    border-left: 4px solid var(--red);
}

.prompt-good {
    background: #f0fdf4;
    border-left: 4px solid var(--green);
}

.prompt-label {
    font-weight: 700;
    margin-bottom: 0.5rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.prompt-bad .prompt-label { color: var(--red); }
.prompt-good .prompt-label { color: var(--green); }

.prompt-text {
    background: var(--white);
    padding: 1rem;
    border-radius: 2px;
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
    margin-bottom: 1rem;
}

.prompt-why {
    font-size: 0.9rem;
    color: var(--medium-brown);
    font-style: italic;
}

/* Download Cards */
.download-card {
    text-align: center;
    padding: 2rem;
    background: var(--white);
    border: 1px solid var(--light-brown);
    transition: all 0.3s ease;
}

.download-card:hover {
    border-color: var(--coral);
    transform: translateY(-4px);
}

.download-icon {
    font-size: 3rem;
    color: var(--coral);
    margin-bottom: 1rem;
}

.download-card h3 {
    margin-bottom: 0.5rem;
}

.download-meta {
    font-size: 0.85rem;
    color: var(--medium-brown);
    margin-bottom: 1rem;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.875rem 1.75rem;
    text-decoration: none;
    font-weight: 600;
    border-radius: 2px;
    transition: all 0.3s ease;
    border: none;
    cursor: pointer;
    text-align: center;
}

.btn-primary {
    background: var(--coral);
    color: var(--white);
}

.btn-primary:hover {
    background: var(--dark-brown);
    transform: translateY(-2px);
}

.btn-secondary {
    background: transparent;
    color: var(--dark-brown);
    border: 2px solid var(--dark-brown);
}

.btn-secondary:hover {
    background: var(--dark-brown);
    color: var(--white);
}

.btn i {
    margin-left: 0.5rem;
}

/* Info Box */
.info-box {
    background: var(--white);
    border-left: 4px solid var(--coral);
    padding: 1.5rem;
    margin: 2rem 0;
}

.info-box h4 {
    color: var(--dark-brown);
    margin-bottom: 0.75rem;
}

.info-box p {
    color: var(--medium-brown);
    margin-bottom: 0.5rem;
}

/* Footer */
footer {
    background: var(--dark-brown);
    color: var(--cream);
    padding: 2.5rem 0;
    text-align: center;
}

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

footer a:hover {
    text-decoration: underline;
}

.footer-note {
    margin-top: 0.5rem;
    font-size: 0.9rem;
    opacity: 0.8;
}

/* Responsive */
@media (max-width: 768px) {
    .nav-menu {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--white);
        flex-direction: column;
        padding: 1rem 2rem;
        border-bottom: 1px solid var(--light-brown);
        gap: 1rem;
    }

    .nav-menu.active {
        display: flex;
    }

    .nav-toggle {
        display: block;
    }

    .prompt-example {
        grid-template-columns: 1fr;
    }

    .grid-2, .grid-3 {
        grid-template-columns: 1fr;
    }
}