/* ==========================================================================
   Synology Web Station PHP 8.4 Responsive Starter CSS
   Zero external dependencies · Clean, modern, accessible design
   ========================================================================== */

:root {
    --color-primary: #1d4ed8;
    --color-primary-hover: #1e40af;
    --color-bg: #f8fafc;
    --color-surface: #ffffff;
    --color-surface-alt: #f1f5f9;
    --color-text: #0f172a;
    --color-text-muted: #64748b;
    --color-border: #e2e8f0;
    --color-success-bg: #f0fdf4;
    --color-success-border: #bbf7d0;
    --color-success-text: #166534;
    --color-error-bg: #fef2f2;
    --color-error-border: #fecaca;
    --color-error-text: #991b1b;
    --font-sans: 'Plus Jakarta Sans', system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 14px;
    --container-max: 1120px;
    --transition: all 0.2s ease-in-out;
}

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font-sans);
    background-color: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.site-main {
    flex: 1 0 auto;
}

/* Container */
.container {
    width: 100%;
    max-width: var(--container-max);
    margin-left: auto;
    margin-right: auto;
    padding-left: 1.5rem;
    padding-right: 1.5rem;
}

/* Header & Top Bar */
.site-header {
    background-color: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: 0;
    z-index: 50;
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 4.5rem;
    gap: 1.5rem;
}

.brand-link {
    text-decoration: none;
    color: var(--color-text);
    font-weight: 700;
    font-size: 1.25rem;
    letter-spacing: -0.02em;
    white-space: nowrap;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.brand-link:hover {
    color: var(--color-primary);
}

.main-nav {
    display: flex;
    align-items: center;
    gap: 2rem;
}

.nav-list {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    list-style: none;
}

.nav-link {
    text-decoration: none;
    color: var(--color-text-muted);
    font-weight: 500;
    font-size: 0.95rem;
    transition: var(--transition);
    padding: 0.5rem 0;
    position: relative;
}

.nav-link:hover,
.nav-link.active {
    color: var(--color-text);
}

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 2px;
    background-color: var(--color-primary);
}

.mobile-nav-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
    width: 44px;
    height: 44px;
    align-items: center;
    justify-content: center;
}

.nav-toggle-icon {
    display: block;
    width: 22px;
    height: 2px;
    background-color: var(--color-text);
    position: relative;
    transition: var(--transition);
}

.nav-toggle-icon::before,
.nav-toggle-icon::after {
    content: '';
    position: absolute;
    width: 22px;
    height: 2px;
    background-color: var(--color-text);
    left: 0;
    transition: var(--transition);
}

.nav-toggle-icon::before { top: -7px; }
.nav-toggle-icon::after { bottom: -7px; }

.mobile-nav-toggle[aria-expanded="true"] .nav-toggle-icon {
    background-color: transparent;
}
.mobile-nav-toggle[aria-expanded="true"] .nav-toggle-icon::before {
    transform: rotate(45deg);
    top: 0;
}
.mobile-nav-toggle[aria-expanded="true"] .nav-toggle-icon::after {
    transform: rotate(-45deg);
    bottom: 0;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 0.95rem;
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius-md);
    text-decoration: none;
    cursor: pointer;
    transition: var(--transition);
    border: 1px solid transparent;
    min-height: 44px;
    white-space: nowrap;
}

.btn-sm {
    padding: 0.45rem 1rem;
    font-size: 0.85rem;
    min-height: 36px;
}

.btn-primary {
    background-color: var(--color-primary);
    color: #ffffff;
}

.btn-primary:hover {
    background-color: var(--color-primary-hover);
    box-shadow: 0 4px 12px rgba(29, 78, 216, 0.2);
}

.btn-secondary {
    background-color: var(--color-surface);
    color: var(--color-text);
    border-color: var(--color-border);
}

.btn-secondary:hover {
    background-color: var(--color-surface-alt);
    border-color: #cbd5e1;
}

.btn-block {
    width: 100%;
}

/* Sections */
.section {
    padding: 4.5rem 0;
}

.hero-section {
    padding: 5.5rem 0 4.5rem;
    background: linear-gradient(180deg, #ffffff 0%, var(--color-bg) 100%);
    border-bottom: 1px solid var(--color-border);
}

.hero-container {
    text-align: left;
    max-width: 820px;
    margin-left: auto;
    margin-right: auto;
}

.hero-meta {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.85rem;
    color: var(--color-text-muted);
    font-weight: 500;
    margin-bottom: 1.25rem;
}

.hero-meta .separator {
    opacity: 0.5;
}

.hero-title {
    font-size: clamp(2.25rem, 4.5vw, 3.5rem);
    font-weight: 700;
    line-height: 1.15;
    letter-spacing: -0.03em;
    color: var(--color-text);
    margin-bottom: 1.5rem;
    text-wrap: balance;
}

.hero-description {
    font-size: 1.15rem;
    line-height: 1.6;
    color: var(--color-text-muted);
    margin-bottom: 2rem;
    max-width: 650px;
}

.hero-actions {
    display: flex;
    align-items: center;
    gap: 1rem;
    flex-wrap: wrap;
}

/* Section Header */
.section-header {
    text-align: center;
    max-width: 650px;
    margin: 0 auto 3.5rem;
}

.section-title {
    font-size: 2rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    margin-bottom: 0.75rem;
}

.section-subtitle {
    color: var(--color-text-muted);
    font-size: 1.05rem;
}

/* Highlights Grid */
.highlights-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.75rem;
}

.highlight-card {
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 2rem;
    transition: var(--transition);
}

.highlight-card:hover {
    border-color: #cbd5e1;
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.04);
}

.card-index {
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: 1rem;
    letter-spacing: 0.05em;
}

.card-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
    color: var(--color-text);
}

.card-text {
    font-size: 0.95rem;
    color: var(--color-text-muted);
    line-height: 1.55;
}

/* CTA Box */
.cta-box {
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 3rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 2rem;
}

.cta-title {
    font-size: 1.65rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.cta-desc {
    color: var(--color-text-muted);
    font-size: 1.05rem;
}

/* Page Header */
.page-header-section {
    padding: 3.5rem 0 2rem;
    border-bottom: 1px solid var(--color-border);
    background-color: var(--color-surface);
}

.page-title {
    font-size: 2.5rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    margin-bottom: 0.75rem;
}

.page-lead {
    font-size: 1.15rem;
    color: var(--color-text-muted);
    max-width: 700px;
}

/* Content Page */
.content-container {
    max-width: 780px;
}

.text-block h2 {
    font-size: 1.75rem;
    margin: 2rem 0 1rem;
}

.text-block h3 {
    font-size: 1.35rem;
    margin: 1.75rem 0 0.75rem;
}

.text-block p {
    font-size: 1.05rem;
    color: #334155;
    margin-bottom: 1.25rem;
}

.text-block ul {
    margin: 1rem 0 1.5rem 1.5rem;
    color: #334155;
}

.text-block li {
    margin-bottom: 0.5rem;
}

.inline-cta {
    margin-top: 2.5rem;
}

/* Contact Page Layout */
.contact-layout {
    display: grid;
    grid-template-columns: 1fr 1.4fr;
    gap: 2.5rem;
    align-items: start;
}

.contact-info-card,
.contact-form-card {
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 2.25rem;
}

.info-title,
.form-title {
    font-size: 1.35rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
}

.info-desc {
    color: var(--color-text-muted);
    font-size: 0.95rem;
    margin-bottom: 2rem;
}

.info-list {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.info-item {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.info-label {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-text-muted);
}

.info-value {
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-text);
    text-decoration: none;
}

.email-link {
    color: var(--color-primary);
}

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

.server-note {
    background-color: var(--color-surface-alt);
    border-radius: var(--radius-md);
    padding: 1rem;
    font-size: 0.85rem;
    color: var(--color-text-muted);
}

.server-badge {
    display: inline-block;
    font-weight: 600;
    color: var(--color-primary);
    margin-bottom: 0.25rem;
}

/* Form Elements */
.contact-form {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
    margin-top: 1.5rem;
}

.form-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.25rem;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
}

.form-label {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--color-text);
}

.form-label .required {
    color: #ef4444;
}

.form-control {
    width: 100%;
    padding: 0.75rem 1rem;
    font-family: inherit;
    font-size: 0.95rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    background-color: #ffffff;
    color: var(--color-text);
    transition: var(--transition);
}

.form-control:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(29, 78, 216, 0.15);
}

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

/* Alerts */
.alert {
    padding: 1rem 1.25rem;
    border-radius: var(--radius-md);
    font-size: 0.95rem;
    margin-bottom: 1.25rem;
    border: 1px solid transparent;
}

.alert-success {
    background-color: var(--color-success-bg);
    border-color: var(--color-success-border);
    color: var(--color-success-text);
}

.alert-error {
    background-color: var(--color-error-bg);
    border-color: var(--color-error-border);
    color: var(--color-error-text);
}

/* Footer */
.site-footer {
    background-color: var(--color-surface);
    border-top: 1px solid var(--color-border);
    padding-top: 4rem;
    margin-top: 4rem;
}

.footer-inner {
    display: grid;
    grid-template-columns: 2fr 1fr 1.5fr;
    gap: 3rem;
    padding-bottom: 3rem;
}

.footer-brand {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-text);
    display: block;
    margin-bottom: 0.5rem;
}

.footer-tagline {
    color: var(--color-text-muted);
    font-size: 0.95rem;
    margin-bottom: 1rem;
}

.footer-synology {
    font-size: 0.8rem;
    color: #94a3b8;
}

.footer-heading {
    font-size: 0.9rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-text);
    margin-bottom: 1.25rem;
}

.footer-links,
.footer-contact-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.65rem;
}

.footer-links a,
.footer-contact-list a {
    text-decoration: none;
    color: var(--color-text-muted);
    font-size: 0.9rem;
    transition: var(--transition);
}

.footer-links a:hover,
.footer-contact-list a:hover {
    color: var(--color-primary);
}

.footer-contact-list li {
    font-size: 0.9rem;
    color: var(--color-text-muted);
}

.footer-bottom {
    border-top: 1px solid var(--color-border);
    padding: 1.5rem 0;
    background-color: var(--color-surface-alt);
    font-size: 0.85rem;
    color: var(--color-text-muted);
}

.footer-bottom-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    flex-wrap: wrap;
}

/* ==========================================================================
   Responsive Breakpoints (Mobile First & Tablet)
   ========================================================================== */

@media (max-width: 900px) {
    .highlights-grid {
        grid-template-columns: 1fr;
    }

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

    .footer-inner {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .cta-box {
        flex-direction: column;
        align-items: flex-start;
        padding: 2rem;
    }
}

@media (max-width: 768px) {
    .mobile-nav-toggle {
        display: flex;
    }

    .main-nav {
        position: fixed;
        top: 4.5rem;
        left: 0;
        right: 0;
        background-color: var(--color-surface);
        border-bottom: 1px solid var(--color-border);
        flex-direction: column;
        align-items: stretch;
        padding: 1.5rem;
        gap: 1.5rem;
        box-shadow: 0 10px 25px rgba(0, 0, 0, 0.08);
        display: none;
    }

    .main-nav.is-open {
        display: flex;
    }

    .nav-list {
        flex-direction: column;
        align-items: stretch;
        gap: 0.5rem;
    }

    .nav-link {
        padding: 0.75rem 0.5rem;
        border-radius: var(--radius-sm);
    }

    .nav-link.active::after {
        display: none;
    }

    .nav-link.active {
        background-color: var(--color-surface-alt);
        color: var(--color-primary);
    }

    .nav-action .btn {
        width: 100%;
    }

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

    .hero-title {
        font-size: 2.25rem;
    }

    .section {
        padding: 3rem 0;
    }
}