/* ======================================================
   shared.css - Design tokens, nav, footer, content pages
   ====================================================== */

:root {
    /* Dark blue theme */
    --bg: #0f172a;
    --bg-elevated: #1e293b;
    --panel: #1e293b;
    --panel-hover: #334155;
    --muted: #94a3b8;
    --border: #334155;
    --border-light: #475569;
    --text: #f1f5f9;
    --text-secondary: #cbd5e1;
    --brand: #3b82f6;
    --brand-light: #1e3a5f;
    --brand-dark: #2563eb;
    --brand-subtle: #1e40af;
    --accent-purple: #a78bfa;
    --danger-bg: #450a0a;
    --danger: #f87171;
    --success: #4ade80;
    --accent-gradient: linear-gradient(135deg, #3b82f6 0%, #8b5cf6 100%);
}

/* ---------- Reset & Base ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

html, body { height: 100%; }

body {
    margin: 0;
    font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji";
    color: var(--text);
    background: linear-gradient(180deg, var(--bg-elevated) 0%, var(--bg) 100%);
    background-attachment: fixed;
}

/* ---------- Navigation Bar ---------- */
.site-nav {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(15, 23, 42, 0.9);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
}

.nav-container {
    max-width: 1080px;
    margin: 0 auto;
    padding: 0 16px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 68px;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
    color: rgba(241, 245, 249, 0.9);
    font-weight: 700;
    font-size: 24px;
    flex-shrink: 0;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
    transition: color 0.2s ease;
}

.nav-logo:hover {
    color: rgba(255, 255, 255, 1);
}

.nav-logo img {
    width: 40px;
    height: 40px;
    border-radius: 8px;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 4px;
    list-style: none;
    margin: 0;
    padding: 0;
}

.nav-links a {
    display: inline-flex;
    align-items: center;
    padding: 6px 14px;
    border-radius: 10px;
    font-size: 14px;
    font-weight: 500;
    color: var(--text-secondary);
    text-decoration: none;
    transition: background .15s, color .15s;
}

.nav-links a:hover {
    background: var(--brand-light);
    color: var(--accent-purple);
}

.nav-links a.active {
    color: #fff;
    background: var(--brand-light);
    font-weight: 600;
}

/* Hamburger toggle */
.nav-toggle {
    display: none;
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 6px 10px;
    cursor: pointer;
    color: var(--text);
    transition: background 0.15s ease;
}

.nav-toggle:hover {
    background: var(--panel-hover);
}

.nav-toggle svg {
    width: 22px;
    height: 22px;
    display: block;
}

/* ---------- Enhanced Site Footer ---------- */
.site-footer-enhanced {
    background: var(--bg);
    border-top: 1px solid var(--border);
    margin-top: 60px;
    padding: 40px 16px 0;
    font-size: 14px;
    color: var(--muted);
}

.footer-col-title {
    color: var(--text);
}

.footer-inner {
    max-width: 1080px;
    margin: 0 auto;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 32px;
    margin-bottom: 32px;
}

.footer-col-title {
    font-size: 11px;
    font-weight: 600;
    letter-spacing: .06em;
    text-transform: uppercase;
    color: var(--text);
    margin: 0 0 12px;
}

.footer-brand-name {
    font-size: 18px;
    font-weight: 700;
    color: rgba(241, 245, 249, 0.9);
    margin: 0 0 8px;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
}

.footer-brand-text {
    line-height: 1.6;
    margin: 0;
}

.footer-links {
    list-style: none;
    margin: 0;
    padding: 0;
}

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

.footer-links a {
    color: var(--muted);
    text-decoration: none;
    transition: color .15s;
}

.footer-links a:hover {
    color: var(--accent-purple);
}

.footer-bottom {
    border-top: 1px solid var(--border);
    padding: 16px 0;
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 8px;
    font-size: 12px;
}

/* ---------- Content Page Layout ---------- */
.page-container {
    max-width: 820px;
    margin: 0 auto;
    padding: 32px 16px 48px;
}

.page-container h1 {
    font-size: 32px;
    margin: 0 0 8px;
    line-height: 1.2;
}

.page-container h2 {
    font-size: 22px;
    margin: 32px 0 12px;
}

.page-container h3 {
    font-size: 18px;
    margin: 24px 0 8px;
}

.page-container p,
.page-container li {
    line-height: 1.7;
    font-size: 16px;
}

.page-container a {
    color: var(--accent-purple);
    text-decoration: none;
    transition: color 0.15s ease;
}

.page-container a:hover {
    color: var(--accent-purple);
    text-decoration: underline;
}

.page-container .subtle {
    color: var(--muted);
    font-size: 14px;
    margin-bottom: 20px;
}

/* ---------- Hero Section (index.html) ---------- */
.hero {
    text-align: center;
    padding: 48px 16px 40px;
    max-width: 720px;
    margin: 0 auto;
}

.hero h1 {
    font-size: 36px;
    line-height: 1.2;
    margin: 0 0 16px;
}

.hero-sub {
    font-size: 18px;
    color: var(--text-secondary);
    line-height: 1.6;
    margin: 0 0 24px;
    max-width: 560px;
    margin-left: auto;
    margin-right: auto;
}

.hero .btn {
    cursor: pointer;
    border: none;
    background: var(--accent-gradient);
    color: #fff;
    padding: 14px 32px;
    border-radius: 12px;
    font-size: 16px;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    text-decoration: none;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    box-shadow: 0 4px 20px rgba(59, 130, 246, 0.4), 0 0 40px rgba(139, 92, 246, 0.2);
}

.hero .btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 30px rgba(59, 130, 246, 0.5), 0 0 50px rgba(139, 92, 246, 0.3);
}

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

/* ---------- Features Grid ---------- */
.features-section {
    max-width: 980px;
    margin: 0 auto 40px;
    padding: 0 16px;
}

.features-section h2 {
    text-align: center;
    font-size: 26px;
    margin: 0 0 24px;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 16px;
}

.feature-card {
    border: 1px solid var(--border);
    background: var(--panel);
    border-radius: 16px;
    padding: 24px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, .2);
    transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}

.feature-card:hover {
    transform: translateY(-2px);
    background: var(--panel-hover);
    box-shadow: 0 8px 30px rgba(0, 0, 0, .3);
}

.feature-card h3 {
    color: var(--text);
}

.feature-icon {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--brand-light);
    border-radius: 12px;
    margin-bottom: 14px;
    color: var(--brand);
}

.feature-icon svg {
    width: 24px;
    height: 24px;
}

.feature-card h3 {
    margin: 0 0 8px;
    font-size: 16px;
}

.feature-card p {
    margin: 0;
    font-size: 14px;
    color: var(--muted);
    line-height: 1.6;
}

/* ---------- How It Works ---------- */
.how-it-works {
    max-width: 980px;
    margin: 0 auto 48px;
    padding: 0 16px;
}

.how-it-works > h2 {
    text-align: center;
    font-size: 26px;
    margin: 0 0 24px;
}

.steps-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 20px;
}

.step {
    text-align: center;
    padding: 24px 16px;
}

.step-number {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: var(--accent-gradient);
    color: #fff;
    font-weight: 700;
    font-size: 18px;
    margin-bottom: 14px;
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.25);
}

.step h3 {
    margin: 0 0 8px;
    font-size: 16px;
}

.step p {
    margin: 0;
    font-size: 14px;
    color: var(--muted);
    line-height: 1.6;
}

/* ---------- Blog Grid & Cards ---------- */
.blog-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
    gap: 20px;
    margin-top: 24px;
}

.blog-card {
    border: 1px solid var(--border);
    background: var(--panel);
    border-radius: 16px;
    padding: 24px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, .2);
    transition: box-shadow .15s, background 0.2s ease;
}

.blog-card:hover {
    background: var(--panel-hover);
    box-shadow: 0 8px 30px rgba(0, 0, 0, .3);
}

.blog-date {
    font-size: 12px;
    color: var(--muted);
    text-transform: uppercase;
    letter-spacing: .04em;
    font-weight: 600;
}

.blog-card h2 {
    font-size: 20px;
    margin: 8px 0 10px;
    line-height: 1.3;
}

.blog-card h2 a {
    color: var(--text);
    text-decoration: none;
    transition: color 0.15s ease;
}

.blog-card h2 a:hover {
    color: var(--accent-purple);
}

.blog-read-more {
    color: var(--accent-purple);
}

.blog-excerpt {
    font-size: 14px;
    color: var(--muted);
    line-height: 1.6;
    margin: 0 0 14px;
}

.blog-read-more {
    font-size: 14px;
    font-weight: 600;
    color: var(--accent-purple);
    text-decoration: none;
}

.blog-read-more:hover {
    color: var(--accent-purple);
    text-decoration: underline;
}

/* ---------- Blog Post ---------- */
.blog-post-header {
    margin-bottom: 32px;
}

.page-container .blog-back-link {
    display: inline-block;
    font-size: 14px;
    color: var(--text);
    text-decoration: none;
    margin-bottom: 16px;
}

.page-container .blog-back-link:hover {
    color: var(--accent-purple);
    text-decoration: none;
}

.blog-meta {
    display: flex;
    gap: 16px;
    font-size: 13px;
    color: var(--muted);
    margin-top: 8px;
}

.blog-cta {
    margin: 48px 0 32px;
    text-align: center;
    padding: 32px;
    border: 1px solid var(--brand-subtle);
    border-radius: 16px;
    background: var(--brand-light);
}

.blog-cta h2 {
    color: var(--text);
}

.blog-cta h2 {
    margin: 0 0 8px;
    font-size: 22px;
}

.blog-cta p {
    margin: 0 0 16px;
    color: var(--muted);
}

.blog-cta .btn {
    cursor: pointer;
    border: none;
    background: var(--accent-gradient);
    color: #fff;
    padding: 12px 28px;
    border-radius: 12px;
    font-size: 15px;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    text-decoration: none;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    box-shadow: 0 4px 14px rgba(37, 99, 235, 0.3);
}

.blog-cta .btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(37, 99, 235, 0.4);
    text-decoration: none;
    color: #fff;
}

.blog-related {
    border-top: 1px solid var(--border);
    padding-top: 24px;
    margin-top: 32px;
}

.blog-related h2 {
    font-size: 18px;
    margin: 0 0 12px;
}

.blog-related ul {
    padding-left: 20px;
}

.blog-related li {
    margin-bottom: 8px;
}

.page-container .blog-related a {
    color: var(--text);
    text-decoration: none;
}

.page-container .blog-related a:hover {
    color: var(--accent-purple);
    text-decoration: none;
}

/* ---------- FAQ Accordion ---------- */
.faq-category {
    margin-bottom: 12px;
}

.faq-item {
    border: 1px solid var(--border);
    border-radius: 12px;
    margin-bottom: 8px;
    overflow: hidden;
    background: var(--panel);
    box-shadow: 0 2px 8px rgba(0, 0, 0, .15);
}

.faq-question {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    padding: 16px 20px;
    background: none;
    border: none;
    font-size: 15px;
    font-weight: 600;
    color: var(--text);
    cursor: pointer;
    text-align: left;
    font-family: inherit;
    gap: 12px;
}

.faq-question::after {
    content: "+";
    font-size: 20px;
    font-weight: 400;
    color: var(--muted);
    flex-shrink: 0;
    transition: transform .2s;
}

.faq-question[aria-expanded="true"]::after {
    content: "\2212";
}

.faq-question:hover {
    color: var(--accent-purple);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height .3s ease;
}

.faq-answer-inner {
    padding: 0 20px 16px;
    font-size: 15px;
    line-height: 1.7;
    color: var(--muted);
}

.faq-answer-inner p {
    margin: 0 0 10px;
}

.faq-answer-inner p:last-child {
    margin-bottom: 0;
}

/* ---------- Contact Form ---------- */
.contact-form {
    max-width: 560px;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    font-size: 13px;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 6px;
    text-transform: none;
    letter-spacing: 0;
}

.form-input,
.form-textarea,
.form-select {
    width: 100%;
    padding: 10px 14px;
    border: 1px solid var(--border);
    border-radius: 10px;
    font-size: 15px;
    font-family: inherit;
    color: var(--text);
    background: var(--bg);
    transition: border-color .15s, background 0.15s;
}

.form-input:focus,
.form-textarea:focus,
.form-select:focus {
    outline: none;
    border-color: var(--brand);
    background: var(--panel);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, .2);
}

.form-input::placeholder,
.form-textarea::placeholder {
    color: var(--muted);
}

.form-textarea {
    resize: vertical;
    min-height: 120px;
}

.form-btn {
    cursor: pointer;
    border: none;
    background: var(--accent-gradient);
    color: #fff;
    padding: 12px 28px;
    border-radius: 12px;
    font-size: 15px;
    font-weight: 600;
    font-family: inherit;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    box-shadow: 0 4px 14px rgba(37, 99, 235, 0.3);
}

.form-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(37, 99, 235, 0.4);
}

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

/* ---------- Comparison Table ---------- */
.comparison-table {
    width: 100%;
    border-collapse: collapse;
    margin: 20px 0;
    font-size: 14px;
}

.comparison-table th,
.comparison-table td {
    padding: 10px 14px;
    border: 1px solid var(--border);
    text-align: left;
}

.comparison-table th {
    background: var(--bg);
    font-weight: 600;
    font-size: 13px;
    color: var(--text);
}

.comparison-table td {
    color: var(--text-secondary);
}

.comparison-table tr:hover td {
    background: var(--panel-hover);
}

/* ---------- Responsive ---------- */
@media (max-width: 768px) {
    .nav-toggle {
        display: block;
    }

    .nav-links {
        display: none;
        position: absolute;
        top: 68px;
        left: 0;
        right: 0;
        background: var(--panel);
        border-bottom: 1px solid var(--border);
        flex-direction: column;
        align-items: flex-start;
        padding: 12px 16px 16px;
        box-shadow: 0 4px 20px rgba(0, 0, 0, .3);
        gap: 4px;
    }

    .nav-links.open {
        display: flex;
    }

    .nav-links li {
        width: 100%;
    }

    .nav-links a {
        padding: 12px 16px;
        width: 100%;
        justify-content: flex-start;
        border-radius: 10px;
    }

    .nav-links a:hover,
    .nav-links a.active {
        background: var(--brand-light);
    }

    .footer-grid {
        grid-template-columns: 1fr 1fr;
        gap: 24px;
    }

    .hero {
        padding: 32px 16px 28px;
    }

    .hero h1 {
        font-size: 26px;
    }

    .hero-sub {
        font-size: 15px;
    }

    .hero .btn {
        padding: 12px 24px;
        font-size: 15px;
    }

    .features-section {
        margin-bottom: 32px;
    }

    .features-section h2,
    .how-it-works > h2 {
        font-size: 22px;
        margin-bottom: 20px;
    }

    .feature-card {
        padding: 20px;
    }

    .how-it-works {
        margin-bottom: 32px;
    }

    .step {
        padding: 20px 12px;
    }

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

    .blog-card {
        padding: 20px;
    }

    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }

    .page-container {
        padding: 24px 16px 40px;
    }

    .page-container h1 {
        font-size: 26px;
    }

    .page-container h2 {
        font-size: 20px;
        margin-top: 28px;
    }

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

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

    .blog-cta {
        padding: 24px 20px;
        margin: 40px 0 28px;
    }

    .blog-cta h2 {
        font-size: 20px;
    }
}

@media (max-width: 480px) {
    .footer-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }

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

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

    .hero h1 {
        font-size: 24px;
    }

    .hero-sub {
        font-size: 14px;
    }

    .nav-container {
        height: 60px;
    }

    .nav-links {
        top: 60px;
    }

    .nav-logo {
        font-size: 20px;
        gap: 10px;
    }

    .nav-logo img {
        width: 32px;
        height: 32px;
    }
}