/* EngineeringSheet Help Center Styles */

:root {
    --primary: #00d4ff;
    --primary-dark: #00b8e6;
    --bg-dark: #0f0f1a;
    --bg-card: #1a1a2e;
    --bg-card-hover: #252542;
    --text-primary: #ffffff;
    --text-secondary: #a0a0b0;
    --text-muted: #6b6b7b;
    --border-color: #2d2d4a;
    --success: #4ade80;
    --warning: #fbbf24;
    --danger: #f87171;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg-dark);
    color: var(--text-primary);
    line-height: 1.6;
}

a {
    color: var(--primary);
    text-decoration: none;
    transition: color 0.2s;
}

a:hover {
    color: var(--primary-dark);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* Header */
.header {
    background: var(--bg-card);
    border-bottom: 1px solid var(--border-color);
    padding: 16px 0;
    position: sticky;
    top: 0;
    z-index: 100;
}

.header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 20px;
    font-weight: 700;
    color: var(--text-primary);
}

.logo:hover {
    color: var(--text-primary);
}

.logo-icon {
    font-size: 24px;
}

.nav {
    display: flex;
    align-items: center;
    gap: 24px;
}

.nav a {
    color: var(--text-secondary);
    font-size: 14px;
    font-weight: 500;
}

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

/* Hero Section */
.hero {
    background: linear-gradient(135deg, var(--bg-card) 0%, rgba(0, 212, 255, 0.1) 100%);
    padding: 80px 0;
    text-align: center;
}

.hero h1 {
    font-size: 48px;
    font-weight: 700;
    margin-bottom: 16px;
}

.hero p {
    font-size: 20px;
    color: var(--text-secondary);
    margin-bottom: 32px;
}

.search-box {
    display: flex;
    max-width: 500px;
    margin: 0 auto;
    background: var(--bg-dark);
    border-radius: 12px;
    overflow: hidden;
    border: 1px solid var(--border-color);
}

.search-box input {
    flex: 1;
    padding: 16px 20px;
    border: none;
    background: transparent;
    color: var(--text-primary);
    font-size: 16px;
}

.search-box input::placeholder {
    color: var(--text-muted);
}

.search-box input:focus {
    outline: none;
}

.search-box button {
    padding: 16px 20px;
    background: var(--primary);
    border: none;
    cursor: pointer;
    color: var(--bg-dark);
    transition: background 0.2s;
}

.search-box button:hover {
    background: var(--primary-dark);
}

/* Quick Links */
.quick-links {
    padding: 60px 0;
}

.quick-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 20px;
}

.quick-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 24px;
    text-align: center;
    transition: all 0.2s;
    color: var(--text-primary);
}

.quick-card:hover {
    background: var(--bg-card-hover);
    border-color: var(--primary);
    transform: translateY(-4px);
}

.quick-icon {
    font-size: 40px;
    margin-bottom: 12px;
}

.quick-card h3 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 8px;
}

.quick-card p {
    font-size: 13px;
    color: var(--text-secondary);
}

/* Help Sections */
.help-section {
    padding: 60px 0;
}

.help-section.alt-bg {
    background: var(--bg-card);
}

.section-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 32px;
}

.section-icon {
    font-size: 32px;
}

.section-header h2 {
    font-size: 28px;
    font-weight: 700;
}

/* FAQ Accordion */
.faq-list {
    max-width: 800px;
}

.faq-item {
    border: 1px solid var(--border-color);
    border-radius: 8px;
    margin-bottom: 12px;
    overflow: hidden;
    background: var(--bg-dark);
}

.help-section.alt-bg .faq-item {
    background: var(--bg-card-hover);
}

.faq-question {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 20px;
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-size: 16px;
    font-weight: 500;
    text-align: left;
    cursor: pointer;
    transition: background 0.2s;
}

.faq-question:hover {
    background: rgba(0, 212, 255, 0.05);
}

.faq-arrow {
    transition: transform 0.2s;
    flex-shrink: 0;
    color: var(--text-secondary);
}

.faq-item.open .faq-arrow {
    transform: rotate(180deg);
}

.faq-answer {
    display: none;
    padding: 0 20px 20px;
    color: var(--text-secondary);
}

.faq-item.open .faq-answer {
    display: block;
}

.faq-answer p {
    margin-bottom: 12px;
}

.faq-answer ul,
.faq-answer ol {
    margin-left: 20px;
    margin-bottom: 12px;
}

.faq-answer li {
    margin-bottom: 8px;
}

.faq-answer code {
    background: var(--bg-card);
    padding: 2px 6px;
    border-radius: 4px;
    font-family: monospace;
    font-size: 14px;
    color: var(--primary);
}

.faq-answer h4 {
    color: var(--text-primary);
    margin-bottom: 8px;
    margin-top: 16px;
}

/* Subject Grid */
.subject-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 20px;
    margin-bottom: 16px;
}

.subject-col h4 {
    margin-bottom: 12px;
}

.subject-col ul {
    list-style: none;
    margin: 0;
}

.subject-col li {
    padding: 4px 0;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 24px;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.2s;
    border: none;
    cursor: pointer;
}

.btn-primary {
    background: var(--primary);
    color: var(--bg-dark);
}

.btn-primary:hover {
    background: var(--primary-dark);
    color: var(--bg-dark);
}

.btn-outline {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-primary);
}

.btn-outline:hover {
    background: var(--bg-card-hover);
    border-color: var(--primary);
}

.btn-link {
    color: var(--primary);
    font-weight: 600;
}

.btn-link:hover {
    text-decoration: underline;
}

/* Contact Section */
.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 24px;
    margin-bottom: 40px;
}

.contact-card {
    background: var(--bg-dark);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 32px;
    text-align: center;
}

.help-section.alt-bg .contact-card {
    background: var(--bg-card-hover);
}

.contact-icon {
    font-size: 48px;
    margin-bottom: 16px;
}

.contact-card h3 {
    font-size: 18px;
    margin-bottom: 8px;
}

.contact-card p {
    color: var(--text-secondary);
    margin-bottom: 20px;
    font-size: 14px;
}

.support-info {
    background: var(--bg-dark);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 32px;
}

.help-section.alt-bg .support-info {
    background: var(--bg-card-hover);
}

.support-info h3 {
    margin-bottom: 16px;
}

.support-info ul {
    list-style: none;
    margin-bottom: 20px;
}

.support-info li {
    padding: 8px 0;
    padding-left: 24px;
    position: relative;
}

.support-info li::before {
    content: "✓";
    position: absolute;
    left: 0;
    color: var(--success);
}

.support-hours {
    color: var(--text-muted);
    font-size: 14px;
}

/* Footer */
.footer {
    background: var(--bg-card);
    border-top: 1px solid var(--border-color);
    padding: 60px 0 30px;
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

.footer-col h4 {
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 16px;
    color: var(--text-primary);
}

.footer-col ul {
    list-style: none;
}

.footer-col li {
    margin-bottom: 8px;
}

.footer-col a {
    color: var(--text-secondary);
    font-size: 14px;
}

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

.footer-bottom {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid var(--border-color);
    color: var(--text-muted);
    font-size: 14px;
}

/* Responsive */
@media (max-width: 768px) {
    .header .container {
        flex-direction: column;
        gap: 16px;
    }

    .nav {
        flex-wrap: wrap;
        justify-content: center;
    }

    .hero {
        padding: 60px 0;
    }

    .hero h1 {
        font-size: 32px;
    }

    .hero p {
        font-size: 16px;
    }

    .section-header h2 {
        font-size: 24px;
    }

    .quick-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .subject-grid {
        grid-template-columns: 1fr;
    }

    .contact-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .quick-grid {
        grid-template-columns: 1fr;
    }

    .faq-question {
        font-size: 14px;
        padding: 16px;
    }

    .faq-answer {
        padding: 0 16px 16px;
        font-size: 14px;
    }
}