/* CrustyRustacean Dev Blog - Base Styles
 * This file contains theme-agnostic styles using CSS layers.
 * CSS custom properties are defined in variables.css (loaded first).
 * Theme variables (--theme-*) are provided via theme.toml configuration.
 */

/* Layer order declaration - controls specificity */
@layer reset, base, components, utilities, theme;

/* ============================================
   RESET LAYER - Normalize browser defaults
   ============================================ */
@layer reset {
    *,
    *::before,
    *::after {
        box-sizing: border-box;
    }

    body {
        margin: 0;
        -webkit-font-smoothing: antialiased;
        -moz-osx-font-smoothing: grayscale;
    }

    img,
    picture,
    video,
    canvas,
    svg {
        display: block;
        max-width: 100%;
    }

    input,
    button,
    textarea,
    select {
        font: inherit;
    }

    p,
    h1,
    h2,
    h3,
    h4,
    h5,
    h6 {
        overflow-wrap: break-word;
    }
}

/* ============================================
   BASE LAYER - Typography and layout defaults
   Note: CSS custom properties are defined in variables.css
   ============================================ */
@layer base {
    /* Apply theme transition to key elements */
    body,
    .card,
    .btn,
    .form-control,
    .navbar,
    footer,
    .alert {
        transition: var(--theme-transition);
    }

    body {
        font-family: var(--font-body);
        line-height: 1.6;
        color: var(--color-text-primary);
        background-color: var(--color-bg-body);
    }

    h1, h2, h3, h4, h5, h6 {
        font-family: var(--font-heading);
        font-weight: 600;
        line-height: 1.3;
    }

    .display-4 {
        font-weight: 700;
    }

    a {
        color: var(--color-primary);
        text-decoration: none;
        transition: color 0.3s ease;
    }

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

    code, pre {
        font-family: var(--font-mono);
    }
}

/* ============================================
   COMPONENTS LAYER - UI Components
   ============================================ */
@layer components {
    /* Navigation */
    .navbar-brand {
        font-weight: 700;
        font-size: 1.5rem;
    }

    .navbar-dark .navbar-nav .nav-link {
        color: rgba(255, 255, 255, 0.9);
        transition: color 0.3s ease;
    }

    .navbar-dark .navbar-nav .nav-link:hover {
        color: var(--color-primary);
    }

    /* Hero Section */
    .hero-section {
        background: linear-gradient(135deg, var(--color-bg-gradient-start), var(--color-bg-gradient-end));
        border-radius: var(--border-radius);
        box-shadow: var(--shadow);
        position: relative;
        overflow: hidden;
    }

    .hero-section::before {
        content: '';
        position: absolute;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.1'%3E%3Ccircle cx='30' cy='30' r='4'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E") repeat;
    }

    .hero-section .container {
        position: relative;
        z-index: 1;
    }

    /* Cards */
    .card {
        border: none;
        border-radius: var(--border-radius);
        box-shadow: var(--shadow);
        transition: all 0.3s ease;
        overflow: hidden;
        background-color: var(--color-bg-elevated);
    }

    .card:hover {
        transform: translateY(-5px);
        box-shadow: var(--shadow-hover);
    }

    .card-header {
        background: linear-gradient(135deg, var(--color-bg-surface), color-mix(in srgb, var(--color-bg-surface), var(--color-border) 30%));
        border-bottom: 1px solid var(--color-border);
        font-weight: 600;
    }

    /* Buttons */
    .btn {
        border-radius: 8px;
        font-weight: 500;
        padding: 0.5rem 1.5rem;
        transition: all 0.3s ease;
        border: 2px solid transparent;
    }

    .btn-primary {
        background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
        border: none;
        color: var(--color-text-on-primary);
    }

    .btn-primary:hover {
        background: linear-gradient(135deg, var(--color-accent), var(--color-primary));
        transform: translateY(-2px);
        box-shadow: 0 4px 15px color-mix(in srgb, var(--color-primary) 30%, transparent);
    }

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

    .btn-outline-primary:hover {
        background-color: var(--color-primary);
        border-color: var(--color-primary);
        color: var(--color-text-on-primary);
        transform: translateY(-2px);
    }

    /* Badges */
    .badge {
        font-weight: 500;
        padding: 0.5em 0.8em;
        border-radius: 6px;
    }

    /* Forms */
    .form-control {
        border-radius: 8px;
        border: 2px solid var(--color-border);
        padding: 0.75rem 1rem;
        transition: all 0.3s ease;
        background-color: var(--color-bg-elevated);
        color: var(--color-text-primary);
    }

    .form-control:focus {
        border-color: var(--color-primary);
        box-shadow: 0 0 0 0.2rem color-mix(in srgb, var(--color-primary) 25%, transparent);
        background-color: var(--color-bg-elevated);
        color: var(--color-text-primary);
    }

    .input-group-text {
        border-radius: 8px 0 0 8px;
        border: 2px solid var(--color-border);
        border-right: none;
        background-color: var(--color-bg-surface);
        color: var(--color-text-secondary);
    }

    /* Authentication Pages */
    .auth-container {
        min-height: 100vh;
        display: flex;
        align-items: center;
        background: linear-gradient(135deg, var(--color-bg-surface) 0%, color-mix(in srgb, var(--color-bg-surface), var(--color-secondary) 20%) 100%);
    }

    .auth-card {
        backdrop-filter: blur(10px);
        background: color-mix(in srgb, var(--color-bg-elevated) 95%, transparent);
        border: 1px solid color-mix(in srgb, var(--color-border) 50%, transparent);
    }

    /* Profile Page */
    .profile-avatar {
        width: 120px;
        height: 120px;
        object-fit: cover;
        border: 4px solid var(--color-bg-elevated);
        box-shadow: var(--shadow);
    }

    .social-links a {
        transition: all 0.3s ease;
    }

    .social-links a:hover {
        transform: translateY(-2px);
        color: var(--color-primary) !important;
    }

    /* Article Cards */
    .article-card {
        transition: all 0.3s ease;
        border-left: 4px solid transparent;
    }

    .article-card:hover {
        border-left-color: var(--color-primary);
        transform: translateX(5px);
    }

    .article-meta {
        font-size: 0.875rem;
        color: var(--color-text-muted);
    }

    .article-meta i {
        width: 16px;
        text-align: center;
    }

    /* Tabs */
    .nav-tabs {
        border-bottom: 2px solid var(--color-border);
    }

    .nav-tabs .nav-link {
        border: none;
        border-bottom: 3px solid transparent;
        color: var(--color-text-muted);
        font-weight: 500;
        padding: 1rem 1.5rem;
        transition: all 0.3s ease;
    }

    .nav-tabs .nav-link:hover {
        border-color: transparent;
        color: var(--color-primary);
    }

    .nav-tabs .nav-link.active {
        background: none;
        border-color: transparent transparent var(--color-primary) transparent;
        color: var(--color-primary);
    }

    /* Footer */
    footer {
        background: linear-gradient(135deg, var(--color-secondary) 0%, color-mix(in oklch, var(--color-secondary), black 10%) 100%);
    }

    footer .social-links a {
        font-size: 1.25rem;
        transition: all 0.3s ease;
    }

    footer .social-links a:hover {
        color: var(--color-primary) !important;
        transform: translateY(-2px);
    }

    /* Alerts */
    .alert {
        border: none;
        border-radius: var(--border-radius);
        border-left: 4px solid;
        box-shadow: var(--shadow);
    }

    .alert-success {
        border-left-color: var(--color-success);
        background-color: color-mix(in srgb, var(--color-success) 10%, var(--color-bg-elevated));
    }

    .alert-danger {
        border-left-color: var(--color-danger);
        background-color: color-mix(in srgb, var(--color-danger) 10%, var(--color-bg-elevated));
    }

    .alert-info {
        border-left-color: var(--color-info);
        background-color: color-mix(in srgb, var(--color-info) 10%, var(--color-bg-elevated));
    }

    .alert-warning {
        border-left-color: var(--color-warning);
        background-color: color-mix(in srgb, var(--color-warning) 10%, var(--color-bg-elevated));
    }

    /* Article Content */
    .article-content,
    .article-body {
        font-size: 1.1rem;
        line-height: 1.8;
        color: var(--color-text-primary);
        font-weight: 400;
    }

    .article-content h1, .article-body h1 {
        font-size: 2.5rem;
        margin-top: 2.5rem;
        margin-bottom: 1.5rem;
        font-weight: 700;
        border-bottom: 2px solid var(--color-border);
        padding-bottom: 0.5rem;
    }

    .article-content h1:first-child, .article-body h1:first-child {
        margin-top: 0;
    }

    .article-content h2, .article-body h2 {
        font-size: 2rem;
        margin-top: 2rem;
        margin-bottom: 1rem;
        font-weight: 600;
        color: var(--color-secondary);
    }

    .article-content h3, .article-body h3 {
        font-size: 1.5rem;
        margin-top: 1.75rem;
        margin-bottom: 0.75rem;
        font-weight: 600;
        color: var(--color-secondary);
    }

    .article-content h4, .article-body h4,
    .article-content h5, .article-body h5,
    .article-content h6, .article-body h6 {
        margin-top: 1.5rem;
        margin-bottom: 0.5rem;
        font-weight: 600;
        color: var(--color-secondary);
    }

    .article-content p, .article-body p {
        margin-bottom: 1.25rem;
        text-align: justify;
    }

    .article-content ul, .article-body ul,
    .article-content ol, .article-body ol {
        margin-bottom: 1.25rem;
        padding-left: 2rem;
    }

    .article-content li, .article-body li {
        margin-bottom: 0.5rem;
        line-height: 1.6;
    }

    .article-content li p, .article-body li p {
        margin-bottom: 0.5rem;
    }

    .article-content pre, .article-body pre {
        background-color: var(--color-bg-surface);
        border: 1px solid var(--color-border);
        border-radius: var(--border-radius);
        padding: 1.5rem;
        overflow-x: auto;
        margin: 1.5rem 0;
        box-shadow: var(--shadow);
        position: relative;
    }

    .article-content code, .article-body code {
        background-color: var(--color-bg-surface);
        padding: 0.2rem 0.4rem;
        border-radius: 4px;
        font-size: 0.9em;
        color: var(--color-danger);
        font-family: var(--font-mono);
    }

    .article-content pre code, .article-body pre code {
        background-color: transparent;
        padding: 0;
        color: var(--color-text-primary);
        font-size: 0.95rem;
    }

    .article-content table, .article-body table {
        width: 100%;
        margin: 1.5rem 0;
        border-collapse: collapse;
        box-shadow: var(--shadow);
        border-radius: var(--border-radius);
        overflow: hidden;
    }

    .article-content th, .article-body th,
    .article-content td, .article-body td {
        padding: 0.75rem 1rem;
        border: 1px solid var(--color-border);
        text-align: left;
    }

    .article-content th, .article-body th {
        background-color: var(--color-primary);
        color: var(--color-text-on-primary);
        font-weight: 600;
        border-color: color-mix(in srgb, var(--color-primary), white 20%);
    }

    .article-content tr:nth-child(even), .article-body tr:nth-child(even) {
        background-color: var(--color-bg-surface);
    }

    .article-content blockquote, .article-body blockquote {
        border-left: 4px solid var(--color-primary);
        padding: 1rem 1.5rem;
        margin: 1.5rem 0;
        font-style: italic;
        background-color: var(--color-bg-surface);
        border-radius: 0 var(--border-radius) var(--border-radius) 0;
        box-shadow: var(--shadow);
    }

    .article-content blockquote p, .article-body blockquote p {
        margin-bottom: 0;
        color: var(--color-text-muted);
        font-size: 1.1rem;
    }

    .article-content hr, .article-body hr {
        margin: 3rem 0;
        border: none;
        height: 2px;
        background: linear-gradient(90deg, transparent, var(--color-primary), transparent);
    }

    .article-content a, .article-body a {
        color: var(--color-primary);
        text-decoration: none;
        font-weight: 500;
        transition: all 0.3s ease;
        border-bottom: 1px solid transparent;
    }

    .article-content a:hover, .article-body a:hover {
        color: var(--color-accent);
        border-bottom-color: var(--color-accent);
    }

    .article-content img, .article-body img {
        max-width: 100%;
        height: auto;
        border-radius: var(--border-radius);
        box-shadow: var(--shadow);
        margin: 1.5rem 0;
        display: block;
        margin-left: auto;
        margin-right: auto;
    }

    /* Task list styles */
    .article-content ul.task-list, .article-body ul.task-list {
        list-style: none;
        padding-left: 1.5rem;
    }

    .article-content .task-list-item, .article-body .task-list-item {
        margin-bottom: 0.5rem;
    }

    .article-content .task-list-item input[type="checkbox"],
    .article-body .task-list-item input[type="checkbox"] {
        margin-right: 0.5rem;
        transform: scale(1.2);
    }
}

/* ============================================
   UTILITIES LAYER - Helper classes
   ============================================ */
@layer utilities {
    /* Loading Animations */
    @keyframes fadeInUp {
        from {
            opacity: 0;
            transform: translateY(30px);
        }
        to {
            opacity: 1;
            transform: translateY(0);
        }
    }

    .fade-in-up {
        animation: fadeInUp 0.6s ease;
    }

    /* Accessibility */
    .sr-only {
        position: absolute;
        width: 1px;
        height: 1px;
        padding: 0;
        margin: -1px;
        overflow: hidden;
        clip: rect(0, 0, 0, 0);
        white-space: nowrap;
        border: 0;
    }

    /* Focus styles */
    .btn:focus,
    .form-control:focus,
    .nav-link:focus {
        outline: 2px solid var(--color-primary);
        outline-offset: 2px;
    }

    /* Skip link */
    .skip-link {
        position: absolute;
        top: -40px;
        left: 6px;
        background: var(--color-primary);
        color: var(--color-text-on-primary);
        padding: 8px;
        text-decoration: none;
        border-radius: 4px;
        z-index: 1000;
    }

    .skip-link:focus {
        top: 6px;
    }

    /* Responsive Design */
    @media (max-width: 768px) {
        .hero-section {
            padding: 2rem 1rem !important;
            margin-bottom: 2rem !important;
        }

        .display-4 {
            font-size: 2rem;
        }

        .card-body {
            padding: 1rem;
        }

        .btn {
            padding: 0.5rem 1rem;
            font-size: 0.875rem;
        }
    }

    @media (max-width: 576px) {
        .container {
            padding-left: 1rem;
            padding-right: 1rem;
        }

        .navbar-brand {
            font-size: 1.25rem;
        }

        .hero-section h1 {
            font-size: 1.75rem;
        }

        .nav-tabs .nav-link {
            padding: 0.75rem 1rem;
            font-size: 0.875rem;
        }
    }

    /* Print styles */
    @media print {
        .navbar,
        .btn,
        footer,
        .social-links {
            display: none !important;
        }

        .card {
            box-shadow: none;
            border: 1px solid #ccc;
        }

        body {
            font-size: 12pt;
            line-height: 1.4;
        }

        h1, h2, h3, h4, h5, h6 {
            page-break-after: avoid;
        }

        .article-content, .article-body {
            font-size: 11pt;
            line-height: 1.4;
        }

        .article-content pre, .article-body pre {
            border: 1px solid #ccc;
            background-color: #f5f5f5;
        }
    }
}

/* ============================================
   THEME LAYER - Theme-specific overrides
   This layer has highest specificity and is
   where theme.toml-generated CSS is injected.
   Theme variable overrides (data-theme attributes)
   are defined in variables.css
   ============================================ */
@layer theme {
    /* Theme-specific styles will be injected here */
    /* This layer is populated by theme variables from theme.toml */
    /* See variables.css for [data-theme] attribute overrides */
}

/* Fallback for browsers that don't support color-mix */
@supports not (background: color-mix(in srgb, red, blue)) {
    .btn-primary:hover {
        box-shadow: 0 4px 15px rgba(255, 107, 53, 0.3);
    }

    .card-header {
        background: linear-gradient(135deg, #f8f9fa, #e9ecef);
    }

    .auth-container {
        background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    }

    .auth-card {
        background: rgba(255, 255, 255, 0.95);
        border: 1px solid rgba(255, 255, 255, 0.2);
    }

    .alert-success {
        background-color: rgba(40, 167, 69, 0.1);
    }

    .alert-danger {
        background-color: rgba(220, 53, 69, 0.1);
    }

    .alert-info {
        background-color: rgba(23, 162, 184, 0.1);
    }

    .alert-warning {
        background-color: rgba(255, 193, 7, 0.1);
    }
}