/* ==========================================================================
   DESIGN SYSTEM & CSS ENGINE
   AI Workflow Risk Assessor for SMEs - PHP v1.1
   ========================================================================== */

/* Color Tokens & Theme Variables */
:root {
    --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji";
    --font-mono: ui-monospace, SFMono-Regular, SF Mono, Menlo, Consolas, Liberation Mono, monospace;

    /* Theme: Dark Mode (Default) */
    --color-brand: #3b82f6;
    --color-brand-strong: #2563eb;
    --color-brand-soft: rgba(59, 130, 246, 0.12);
    --color-accent: #10b981;
    --color-accent-soft: rgba(16, 185, 129, 0.12);
    
    --color-bg: #0b0f19;
    --color-surface: #111827;
    --color-surface-raised: #1f2937;
    --color-surface-hover: #374151;
    
    --color-text: #f9fafb;
    --color-text-muted: #9ca3af;
    --color-text-dim: #6b7280;
    
    --color-border: #1f2937;
    --color-border-strong: #374151;
    --color-focus: #60a5fa;

    /* Risk Tier Colors */
    --color-risk-low: #10b981;
    --color-risk-low-bg: rgba(16, 185, 129, 0.15);
    --color-risk-mod: #f59e0b;
    --color-risk-mod-bg: rgba(245, 158, 11, 0.15);
    --color-risk-high: #f97316;
    --color-risk-high-bg: rgba(249, 115, 22, 0.15);
    --color-risk-crit: #ef4444;
    --color-risk-crit-bg: rgba(239, 68, 68, 0.15);

    --color-success: #10b981;
    --color-warning: #f59e0b;
    --color-danger: #ef4444;

    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-full: 9999px;

    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.2);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.3), 0 2px 4px -1px rgba(0, 0, 0, 0.2);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.4), 0 4px 6px -2px rgba(0, 0, 0, 0.3);

    --container-max: 1200px;
    --header-height: 70px;
    --transition-fast: 0.15s ease;
    --transition-base: 0.25s ease;
}

/* Light Theme Overrides */
[data-theme="light"] {
    --color-brand: #2563eb;
    --color-brand-strong: #1d4ed8;
    --color-brand-soft: rgba(37, 99, 235, 0.08);
    --color-accent: #059669;
    --color-accent-soft: rgba(5, 150, 105, 0.08);

    --color-bg: #f8fafc;
    --color-surface: #ffffff;
    --color-surface-raised: #f1f5f9;
    --color-surface-hover: #e2e8f0;

    --color-text: #0f172a;
    --color-text-muted: #475569;
    --color-text-dim: #64748b;

    --color-border: #e2e8f0;
    --color-border-strong: #cbd5e1;
    --color-focus: #2563eb;

    --color-risk-low: #059669;
    --color-risk-low-bg: rgba(5, 150, 105, 0.1);
    --color-risk-mod: #d97706;
    --color-risk-mod-bg: rgba(217, 119, 6, 0.1);
    --color-risk-high: #ea580c;
    --color-risk-high-bg: rgba(234, 88, 12, 0.1);
    --color-risk-crit: #dc2626;
    --color-risk-crit-bg: rgba(220, 38, 38, 0.1);

    --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.07);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08);
}

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

html {
    font-family: var(--font-family);
    font-size: 16px;
    line-height: 1.6;
    color: var(--color-text);
    background-color: var(--color-bg);
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    overflow-x: hidden;
    overflow-wrap: anywhere;
}

/* Accessibility Focus Ring */
:focus-visible {
    outline: 3px solid var(--color-focus);
    outline-offset: 2px;
}

.skip-to-content {
    position: absolute;
    top: -100px;
    left: 1rem;
    background: var(--color-brand);
    color: #ffffff;
    padding: 0.75rem 1.25rem;
    border-radius: var(--radius-sm);
    z-index: 9999;
    transition: top var(--transition-fast);
    font-weight: 600;
    text-decoration: none;
}

.skip-to-content:focus {
    top: 1rem;
}

/* Layout Utilities */
.container {
    width: 100%;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 clamp(1rem, 4vw, 2rem);
}

.site-main {
    flex: 1;
    padding-bottom: 4rem;
}

/* Header & Navigation */
.site-header {
    height: var(--header-height);
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: 0;
    z-index: 100;
    transition: background-color var(--transition-base), border-color var(--transition-base);
}

.header-container {
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1.5rem;
}

.brand-logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    text-decoration: none;
    color: var(--color-text);
    font-weight: 700;
}

.logo-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 38px;
    height: 38px;
    background: var(--color-brand-soft);
    color: var(--color-brand);
    border-radius: var(--radius-md);
}

.brand-text {
    display: flex;
    flex-direction: column;
}

.brand-title {
    font-size: 1.05rem;
    line-height: 1.2;
    letter-spacing: -0.01em;
}

.brand-badge {
    font-size: 0.7rem;
    text-transform: uppercase;
    color: var(--color-brand);
    letter-spacing: 0.05em;
    font-weight: 600;
}

.main-nav {
    display: none;
}

@media (min-width: 900px) {
    .main-nav {
        display: block;
    }
}

.nav-list {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    list-style: none;
}

.nav-link {
    padding: 0.5rem 0.85rem;
    color: var(--color-text-muted);
    text-decoration: none;
    font-size: 0.925rem;
    font-weight: 500;
    border-radius: var(--radius-sm);
    transition: color var(--transition-fast), background-color var(--transition-fast);
}

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

.nav-link-highlight {
    background: var(--color-brand-soft);
    color: var(--color-brand);
    font-weight: 600;
}

.nav-link-highlight:hover, .nav-link-highlight.active {
    background: var(--color-brand);
    color: #ffffff;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.theme-toggle-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border);
    background: var(--color-surface-raised);
    color: var(--color-text);
    cursor: pointer;
    transition: border-color var(--transition-fast), background-color var(--transition-fast);
}

.theme-toggle-btn:hover {
    border-color: var(--color-border-strong);
    background: var(--color-surface-hover);
}

[data-theme="dark"] .sun-icon { display: block; }
[data-theme="dark"] .moon-icon { display: none; }
[data-theme="light"] .sun-icon { display: none; }
[data-theme="light"] .moon-icon { display: block; }

.mobile-menu-toggle {
    display: inline-flex;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 40px;
    height: 40px;
    padding: 8px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    background: var(--color-surface-raised);
    cursor: pointer;
}

@media (min-width: 900px) {
    .mobile-menu-toggle {
        display: none;
    }
}

.hamburger-bar {
    display: block;
    width: 100%;
    height: 2px;
    background-color: var(--color-text);
    border-radius: 2px;
    transition: transform var(--transition-fast), opacity var(--transition-fast);
}

/* Mobile Drawer Overlay */
.mobile-drawer {
    position: fixed;
    top: var(--header-height);
    left: 0;
    width: 100%;
    height: calc(100dvh - var(--header-height));
    background: var(--color-surface);
    border-top: 1px solid var(--color-border);
    display: none;
    flex-direction: column;
    z-index: 99;
    overflow-y: auto;
}

.mobile-drawer[aria-hidden="false"] {
    display: flex;
}

.mobile-drawer-content {
    padding: 1.5rem;
}

.mobile-nav-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.mobile-nav-link {
    display: block;
    padding: 0.85rem 1rem;
    font-size: 1.1rem;
    font-weight: 500;
    color: var(--color-text);
    text-decoration: none;
    border-radius: var(--radius-md);
    background: var(--color-surface-raised);
}

.mobile-nav-link.active {
    background: var(--color-brand-soft);
    color: var(--color-brand);
    font-weight: 700;
}

/* Hero Component */
.hero-section {
    padding: clamp(2.5rem, 6vw, 4.5rem) 0;
    background: linear-gradient(180deg, var(--color-surface) 0%, var(--color-bg) 100%);
    border-bottom: 1px solid var(--color-border);
}

.hero-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2.5rem;
    align-items: center;
}

@media (min-width: 900px) {
    .hero-grid {
        grid-template-columns: 1.2fr 0.8fr;
    }
}

.hero-title {
    font-size: clamp(2rem, 4vw, 3.25rem);
    line-height: 1.15;
    font-weight: 800;
    letter-spacing: -0.02em;
    color: var(--color-text);
    margin-bottom: 1.25rem;
}

.hero-title-accent {
    color: var(--color-brand);
    display: block;
}

.hero-subtitle {
    font-size: clamp(1.05rem, 1.5vw, 1.25rem);
    color: var(--color-text-muted);
    margin-bottom: 2rem;
    max-width: 65ch;
    line-height: 1.6;
}

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

/* Button UI Components */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.85rem 1.6rem;
    font-size: 1rem;
    font-weight: 600;
    border-radius: var(--radius-md);
    text-decoration: none;
    cursor: pointer;
    border: 1px solid transparent;
    transition: background-color var(--transition-fast), border-color var(--transition-fast), transform var(--transition-fast);
    min-height: 48px;
}

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

.btn-primary:hover {
    background: var(--color-brand-strong);
}

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

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

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

.btn-outline:hover {
    background: var(--color-brand-soft);
}

/* Feature Cards Grid */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(min(100%, 300px), 1fr));
    gap: 1.5rem;
    margin: 2.5rem 0;
}

.card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 1.75rem;
    box-shadow: var(--shadow-sm);
    transition: border-color var(--transition-fast), transform var(--transition-fast);
}

.card:hover {
    border-color: var(--color-border-strong);
}

.card-icon {
    width: 44px;
    height: 44px;
    border-radius: var(--radius-md);
    background: var(--color-brand-soft);
    color: var(--color-brand);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.25rem;
}

.card-title {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
    color: var(--color-text);
}

.card-text {
    color: var(--color-text-muted);
    font-size: 0.975rem;
    line-height: 1.55;
}

/* Content Typography & Sections */
.section {
    padding: 3.5rem 0;
}

.section-title {
    font-size: clamp(1.75rem, 3vw, 2.5rem);
    font-weight: 800;
    margin-bottom: 1rem;
    letter-spacing: -0.01em;
}

.section-intro {
    font-size: 1.125rem;
    color: var(--color-text-muted);
    max-width: 75ch;
    margin-bottom: 2.5rem;
}

.prose {
    line-height: 1.75;
    color: var(--color-text-muted);
}

.prose h2 {
    font-size: 1.6rem;
    color: var(--color-text);
    margin: 2rem 0 1rem 0;
}

.prose h3 {
    font-size: 1.25rem;
    color: var(--color-text);
    margin: 1.5rem 0 0.75rem 0;
}

.prose p {
    margin-bottom: 1.25rem;
}

.prose ul, .prose ol {
    margin: 1rem 0 1.5rem 1.5rem;
}

.prose li {
    margin-bottom: 0.5rem;
}

/* Interactive Assessor Tool Workspace */
.tool-workspace {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2rem;
    margin-top: 2rem;
}

@media (min-width: 1024px) {
    .tool-workspace {
        grid-template-columns: 1.1fr 0.9fr;
    }
}

.tool-panel {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: clamp(1.25rem, 3vw, 2rem);
    box-shadow: var(--shadow-md);
}

.panel-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 1.5rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--color-border);
}

.panel-title {
    font-size: 1.35rem;
    font-weight: 700;
}

.preset-selector {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    margin-bottom: 1.75rem;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-label {
    display: block;
    font-weight: 600;
    font-size: 0.95rem;
    margin-bottom: 0.5rem;
    color: var(--color-text);
}

.form-label-desc {
    display: block;
    font-weight: 400;
    font-size: 0.85rem;
    color: var(--color-text-dim);
    margin-top: 0.2rem;
}

.form-input, .form-select, .form-textarea {
    width: 100%;
    padding: 0.75rem 1rem;
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border-strong);
    background: var(--color-surface-raised);
    color: var(--color-text);
    font-family: inherit;
    font-size: 1px;
    min-height: 44px;
    font-size: 1rem;
    transition: border-color var(--transition-fast);
}

.form-input:focus, .form-select:focus, .form-textarea:focus {
    border-color: var(--color-brand);
    outline: none;
}

/* Range Slider Metric Row */
.risk-metric-row {
    background: var(--color-surface-raised);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 1.25rem;
    margin-bottom: 1.25rem;
}

.risk-metric-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.5rem;
}

.risk-metric-name {
    font-weight: 600;
    font-size: 1rem;
}

.risk-metric-val {
    font-family: var(--font-mono);
    font-weight: 700;
    padding: 0.2rem 0.6rem;
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    background: var(--color-surface);
}

.range-slider {
    width: 100%;
    height: 8px;
    accent-color: var(--color-brand);
    border-radius: var(--radius-full);
    cursor: pointer;
}

/* Score Display Card */
.result-card {
    text-align: center;
    padding: 2rem;
    border-radius: var(--radius-lg);
    background: var(--color-surface-raised);
    border: 1px solid var(--color-border);
    margin-bottom: 2rem;
}

.score-badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 110px;
    height: 110px;
    border-radius: 50%;
    font-size: 2.5rem;
    font-weight: 800;
    font-family: var(--font-mono);
    margin-bottom: 1rem;
}

.score-tier-tag {
    display: inline-block;
    padding: 0.35rem 1rem;
    border-radius: var(--radius-full);
    font-weight: 700;
    text-transform: uppercase;
    font-size: 0.85rem;
    letter-spacing: 0.05em;
    margin-bottom: 0.75rem;
}

.tier-low { background: var(--color-risk-low-bg); color: var(--color-risk-low); }
.tier-mod { background: var(--color-risk-mod-bg); color: var(--color-risk-mod); }
.tier-high { background: var(--color-risk-high-bg); color: var(--color-risk-high); }
.tier-crit { background: var(--color-risk-crit-bg); color: var(--color-risk-crit); }

/* SVG Radar / Matrix Representation */
.matrix-container {
    width: 100%;
    display: flex;
    justify-content: center;
    margin: 1.5rem 0;
}

.matrix-svg {
    max-width: 280px;
    width: 100%;
    height: auto;
}

/* Footer Styling */
.site-footer {
    background: var(--color-surface);
    border-top: 1px solid var(--color-border);
    padding: 4rem 0 2rem 0;
    color: var(--color-text-muted);
    font-size: 0.925rem;
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(min(100%, 220px), 1fr));
    gap: 2.5rem;
    margin-bottom: 3rem;
}

.footer-brand-col {
    grid-column: span 1;
}

@media (min-width: 900px) {
    .footer-brand-col {
        grid-column: span 1;
    }
}

.footer-brand {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--color-text);
    font-weight: 700;
    font-size: 1.1rem;
    margin-bottom: 1rem;
}

.footer-desc {
    line-height: 1.6;
    margin-bottom: 1.25rem;
}

.footer-privacy-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.4rem 0.8rem;
    background: var(--color-brand-soft);
    color: var(--color-brand);
    border-radius: var(--radius-sm);
    font-size: 0.8rem;
    font-weight: 600;
}

.footer-title {
    color: var(--color-text);
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: 1.25rem;

}

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

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

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

.footer-bottom {
    padding-top: 2rem;
    border-top: 1px solid var(--color-border);
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    font-size: 0.85rem;
}

.footer-legal-notice {
    color: var(--color-text-dim);
}

/* Reduced Motion Override */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}