/*
 * DevOps Dashboard — Stylesheet
 *
 * Clean, responsive CSS with a professional dark/teal colour scheme.
 * No frameworks, no dependencies. Just CSS.
 */

/* ==========================================================================
   Reset & Variables
   ========================================================================== */

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

:root {
    --color-primary: #0d9488;
    --color-primary-dark: #0f766e;
    --color-primary-light: #14b8a6;
    --color-accent: #f59e0b;
    --color-bg: #ffffff;
    --color-bg-alt: #f8fafc;
    --color-bg-dark: #0f172a;
    --color-bg-card: #ffffff;
    --color-text: #1e293b;
    --color-text-light: #64748b;
    --color-text-inverse: #f1f5f9;
    --color-border: #e2e8f0;
    --color-success: #10b981;
    --color-error: #ef4444;
    --color-code-bg: #1e293b;
    --color-code-text: #e2e8f0;

    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;

    --max-width: 1100px;
    --radius: 8px;
    --radius-sm: 4px;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --transition: 150ms ease;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
}

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

/* ==========================================================================
   Typography
   ========================================================================== */

h1, h2, h3, h4 {
    font-weight: 700;
    line-height: 1.3;
    color: var(--color-text);
}

h1 { font-size: 2.25rem; }
h2 { font-size: 1.5rem; margin-bottom: 1rem; }
h3 { font-size: 1.25rem; }

p { margin-bottom: 1rem; }

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

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

code {
    font-family: var(--font-mono);
    background: var(--color-bg-alt);
    padding: 2px 6px;
    border-radius: var(--radius-sm);
    font-size: 0.875em;
    color: var(--color-primary-dark);
}

img {
    max-width: 100%;
    height: auto;
}

/* ==========================================================================
   Layout
   ========================================================================== */

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 1.5rem;
}

main {
    flex: 1;
    padding: 3rem 0;
}

/* ==========================================================================
   Header & Navigation
   ========================================================================== */

.site-header {
    background: var(--color-bg-dark);
    color: var(--color-text-inverse);
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow-md);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}

.site-logo {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-text-inverse);
    text-decoration: none;
    letter-spacing: -0.025em;
}

.site-logo:hover {
    color: var(--color-primary-light);
    text-decoration: none;
}

.site-logo .logo-accent {
    color: var(--color-primary-light);
}

.main-nav {
    display: flex;
    list-style: none;
    gap: 0.25rem;
}

.main-nav a {
    color: var(--color-text-inverse);
    padding: 0.5rem 0.75rem;
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    font-weight: 500;
    text-decoration: none;
    transition: background var(--transition), color var(--transition);
}

.main-nav a:hover,
.main-nav a.active {
    background: rgba(255, 255, 255, 0.1);
    color: var(--color-primary-light);
    text-decoration: none;
}

/* Mobile nav toggle */
.nav-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--color-text-inverse);
    font-size: 1.5rem;
    cursor: pointer;
    padding: 0.5rem;
}

.nav-toggle span {
    display: block;
    width: 22px;
    height: 2px;
    background: currentColor;
    margin: 5px 0;
    transition: transform var(--transition);
}

/* ==========================================================================
   Hero Section (Home Page)
   ========================================================================== */

.hero {
    text-align: center;
    padding: 4rem 0 3rem;
}

.hero h1 {
    font-size: 2.75rem;
    margin-bottom: 0.5rem;
    letter-spacing: -0.03em;
}

.hero .subtitle {
    font-size: 1.25rem;
    color: var(--color-text-light);
    margin-bottom: 1.5rem;
}

.hero .intro {
    max-width: 600px;
    margin: 0 auto 2rem;
    color: var(--color-text-light);
    line-height: 1.7;
}

.hero-links {
    display: flex;
    justify-content: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius);
    font-weight: 600;
    font-size: 0.9rem;
    text-decoration: none;
    transition: background var(--transition), transform var(--transition);
    cursor: pointer;
    border: none;
}

.btn:hover {
    text-decoration: none;
    transform: translateY(-1px);
}

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

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

.btn-outline {
    background: transparent;
    color: var(--color-primary);
    border: 2px solid var(--color-primary);
}

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

/* ==========================================================================
   Cards
   ========================================================================== */

.card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 1.5rem;
    transition: box-shadow var(--transition), transform var(--transition);
}

.card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

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

.card p {
    color: var(--color-text-light);
    font-size: 0.95rem;
    line-height: 1.6;
}

/* ==========================================================================
   Projects Page
   ========================================================================== */

.page-header {
    margin-bottom: 2rem;
}

.page-header h1 {
    margin-bottom: 0.5rem;
}

.page-header .page-subtitle {
    color: var(--color-text-light);
    font-size: 1.1rem;
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 1.5rem;
}

.project-card .tech-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.375rem;
    margin-top: 1rem;
}

.tech-tag {
    background: var(--color-primary);
    color: white;
    padding: 2px 10px;
    border-radius: 9999px;
    font-size: 0.75rem;
    font-weight: 600;
}

.project-links {
    display: flex;
    gap: 1rem;
    margin-top: 1rem;
}

.project-links a {
    font-size: 0.85rem;
    font-weight: 600;
}

/* ==========================================================================
   Blog / TIL Page
   ========================================================================== */

.blog-entries {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.blog-entry {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 1.5rem;
    border-left: 4px solid var(--color-primary);
}

.blog-entry .entry-date {
    font-size: 0.8rem;
    color: var(--color-text-light);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.blog-entry h3 {
    margin: 0.5rem 0;
}

.blog-entry .entry-content {
    color: var(--color-text-light);
    line-height: 1.7;
}

.blog-entry .entry-tags {
    display: flex;
    gap: 0.5rem;
    margin-top: 0.75rem;
}

.blog-entry .entry-tags span {
    background: var(--color-bg-alt);
    color: var(--color-text-light);
    padding: 2px 10px;
    border-radius: 9999px;
    font-size: 0.75rem;
    font-weight: 500;
}

/* ==========================================================================
   Dashboard Page
   ========================================================================== */

.dashboard-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(480px, 1fr));
    gap: 1.5rem;
}

.dashboard-section {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    overflow: hidden;
}

.dashboard-section h2 {
    padding: 1rem 1.5rem;
    margin: 0;
    background: var(--color-bg-alt);
    border-bottom: 1px solid var(--color-border);
    font-size: 1rem;
    font-weight: 600;
}

.info-table {
    width: 100%;
    border-collapse: collapse;
}

.info-table tr {
    border-bottom: 1px solid var(--color-border);
}

.info-table tr:last-child {
    border-bottom: none;
}

.info-table td {
    padding: 0.75rem 1.5rem;
    font-size: 0.9rem;
}

.info-table td:first-child {
    font-weight: 600;
    color: var(--color-text);
    width: 40%;
    white-space: nowrap;
}

.info-table td:last-child {
    color: var(--color-text-light);
    font-family: var(--font-mono);
    font-size: 0.85rem;
    word-break: break-all;
}

.status-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.375rem;
    padding: 0.25rem 0.75rem;
    border-radius: 9999px;
    font-size: 0.8rem;
    font-weight: 600;
}

.status-badge.healthy {
    background: #d1fae5;
    color: #065f46;
}

.status-badge .dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: currentColor;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

/* ==========================================================================
   Contact Page
   ========================================================================== */

.contact-form {
    max-width: 600px;
}

.form-group {
    margin-bottom: 1.25rem;
}

.form-group label {
    display: block;
    font-weight: 600;
    font-size: 0.9rem;
    margin-bottom: 0.375rem;
    color: var(--color-text);
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    font-family: var(--font-sans);
    font-size: 0.95rem;
    transition: border-color var(--transition), box-shadow var(--transition);
    background: var(--color-bg);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(13, 148, 136, 0.1);
}

.form-group textarea {
    min-height: 150px;
    resize: vertical;
}

.alert {
    padding: 1rem 1.25rem;
    border-radius: var(--radius-sm);
    margin-bottom: 1.5rem;
    font-size: 0.9rem;
}

.alert-success {
    background: #d1fae5;
    color: #065f46;
    border: 1px solid #a7f3d0;
}

.alert-error {
    background: #fee2e2;
    color: #991b1b;
    border: 1px solid #fecaca;
}

/* ==========================================================================
   Home Page Feature Cards
   ========================================================================== */

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.5rem;
    margin-top: 2rem;
}

.feature-card {
    text-align: center;
    padding: 2rem 1.5rem;
}

.feature-card .feature-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

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

/* ==========================================================================
   404 Page
   ========================================================================== */

.error-page {
    text-align: center;
    padding: 4rem 0;
}

.error-page .error-code {
    font-size: 8rem;
    font-weight: 800;
    color: var(--color-border);
    line-height: 1;
}

.error-page h1 {
    margin: 1rem 0;
}

.error-page p {
    color: var(--color-text-light);
    max-width: 500px;
    margin: 0 auto 2rem;
}

/* ==========================================================================
   Footer
   ========================================================================== */

.site-footer {
    background: var(--color-bg-dark);
    color: var(--color-text-inverse);
    padding: 1.5rem 0;
    margin-top: auto;
}

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

.footer-copyright {
    font-size: 0.85rem;
    color: var(--color-text-light);
}

.footer-links {
    display: flex;
    gap: 1.5rem;
}

.footer-links a {
    color: var(--color-text-light);
    font-size: 0.85rem;
    text-decoration: none;
    transition: color var(--transition);
}

.footer-links a:hover {
    color: var(--color-primary-light);
}

/* ==========================================================================
   Responsive
   ========================================================================== */

@media (max-width: 768px) {
    h1 { font-size: 1.75rem; }
    .hero h1 { font-size: 2rem; }

    .nav-toggle { display: block; }

    .main-nav {
        display: none;
        position: absolute;
        top: 64px;
        left: 0;
        right: 0;
        background: var(--color-bg-dark);
        flex-direction: column;
        padding: 0.75rem;
        border-top: 1px solid rgba(255, 255, 255, 0.1);
        box-shadow: var(--shadow-lg);
    }

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

    .main-nav a {
        padding: 0.75rem;
    }

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

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

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

@media (max-width: 480px) {
    .container {
        padding: 0 1rem;
    }

    main {
        padding: 2rem 0;
    }

    .hero {
        padding: 2rem 0;
    }

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