/* ==========================================================================
   1. CSS Variables & Root
   ========================================================================== */
:root {
    /* Fonts */
    --font-sans: 'Inter', sans-serif;
    --font-mono: 'Fira Code', monospace;

    /* Light Theme Colors */
    --color-bg: #f8f9fa;
    --color-bg-secondary: #ffffff;
    --color-text-primary: #212529;
    --color-text-secondary: #495057;
    --color-border: #dee2e6;
    --color-glass-bg: rgba(255, 255, 255, 0.7);

    /* Brand & Accent Colors */
    --color-brand: #4f46e5;
    --color-brand-hover: #4338ca;
    --color-emerald: #059669;
    --color-amber: #d97706;

    /* Spacing & Radii */
    --spacing-unit: 8px;
    --border-radius: 8px;
    --border-radius-sm: 4px;
}

.dark {
    /* Dark Theme Colors */
    --color-bg: #111827;
    --color-bg-secondary: #1f2937;
    --color-text-primary: #f9fafb;
    --color-text-secondary: #9ca3af;
    --color-border: #374151;
    --color-glass-bg: rgba(17, 24, 39, 0.7);
}

/* ==========================================================================
   2. Base Styles
   ========================================================================== */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

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

body {
    font-family: var(--font-sans);
    background-color: var(--color-bg);
    color: var(--color-text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    transition: background-color 0.3s, color 0.3s;
}

a {
    color: var(--color-brand);
    text-decoration: none;
    transition: color 0.2s;
}

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

h1, h2, h3 {
    line-height: 1.2;
    font-weight: 700;
}

/* ==========================================================================
   3. Layout & Container
   ========================================================================== */
.main-container {
    max-width: 1200px;
    margin-left: auto;
    margin-right: auto;
    padding-left: calc(var(--spacing-unit) * 2);
    padding-right: calc(var(--spacing-unit) * 2);
}

/* ==========================================================================
   4. Header & Navigation
   ========================================================================== */
.header {
    position: sticky;
    top: 0;
    width: 100%;
    z-index: 50;
    border-bottom: 1px solid var(--color-border);
    transition: background-color 0.3s, border-color 0.3s;
}

.header.glass {
    background-color: var(--color-glass-bg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}

.brand-logo {
    display: flex;
    align-items: center;
    gap: calc(var(--spacing-unit) * 1.5);
    color: var(--color-text-primary);
}

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

.brand-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    background-color: var(--color-brand);
    color: white;
    border-radius: var(--border-radius-sm);
    transition: transform 0.2s;
}

.brand-logo:hover .brand-icon {
    transform: rotate(-10deg);
}

.brand-text {
    font-weight: 700;
    font-size: 1.25rem;
}

.brand-suffix {
    color: var(--color-text-secondary);
}

.brand-subtitle {
    display: block;
    font-size: 0.8rem;
    color: var(--color-text-secondary);
    margin-top: -4px;
}

.nav-desktop {
    display: none; /* Hidden on mobile first */
}

.nav-link {
    color: var(--color-text-secondary);
    font-weight: 500;
    padding: var(--spacing-unit) calc(var(--spacing-unit) * 2);
}

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

.header-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-unit);
}

.btn-cta {
    display: none; /* Hidden on mobile first */
}

.mobile-menu-btn {
    background: none;
    border: none;
    color: var(--color-text-primary);
    cursor: pointer;
    padding: var(--spacing-unit);
}

.nav-mobile {
    display: none;
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    background-color: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
}

.nav-mobile.is-open {
    display: block;
}

.nav-mobile-link {
    display: block;
    padding: calc(var(--spacing-unit) * 1.5) calc(var(--spacing-unit) * 2);
    font-weight: 500;
    color: var(--color-text-secondary);
    border-top: 1px solid var(--color-border);
}

.nav-mobile-link:hover {
    background-color: var(--color-bg-secondary);
    color: var(--color-text-primary);
}

/* ==========================================================================
   5. Main Content & Sections
   ========================================================================== */
.main-content {
    padding-top: calc(var(--spacing-unit) * 6);
    padding-bottom: calc(var(--spacing-unit) * 6);
}

section {
    padding-top: calc(var(--spacing-unit) * 6);
    padding-bottom: calc(var(--spacing-unit) * 6);
}

.hero-section {
    text-align: center;
    padding-top: calc(var(--spacing-unit) * 4);
    padding-bottom: calc(var(--spacing-unit) * 8);
}

.hero-content {
    max-width: 700px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: calc(var(--spacing-unit) * 3);
}

.hero-title {
    font-size: 2.5rem;
    font-weight: 800;
}

.gradient-text {
    background: linear-gradient(to right, var(--color-brand), var(--color-emerald));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-fill-color: transparent;
}

.hero-subtitle {
    font-size: 1.125rem;
    color: var(--color-text-secondary);
    max-width: 550px;
}

.micro-badges {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: calc(var(--spacing-unit) * 2);
    color: var(--color-text-secondary);
    font-size: 0.9rem;
}

.micro-badge {
    display: flex;
    align-items: center;
    gap: var(--spacing-unit);
}

.micro-badge svg {
    color: var(--color-emerald);
}

.section-header {
    margin-bottom: calc(var(--spacing-unit) * 4);
}

.section-header-centered {
    text-align: center;
    margin-bottom: calc(var(--spacing-unit) * 6);
}

.section-title {
    font-size: 2rem;
    margin-bottom: var(--spacing-unit);
}

.section-subtitle {
    color: var(--color-text-secondary);
    font-size: 1.1rem;
}

/* ==========================================================================
   6. Tools Grid
   ========================================================================== */
.tools-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: calc(var(--spacing-unit) * 3);
}

.tool-card {
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    background-color: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    padding: calc(var(--spacing-unit) * 3);
    transition: transform 0.2s, box-shadow 0.2s;
    color: var(--color-text-primary);
}

.tool-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -2px rgba(0,0,0,0.05);
    color: var(--color-text-primary);
}

.tool-card-icon-wrapper {
    color: var(--color-brand);
    margin-bottom: calc(var(--spacing-unit) * 2);
}

.tool-card-title {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: var(--spacing-unit);
}

.tool-card-description {
    color: var(--color-text-secondary);
    font-size: 0.95rem;
    margin-bottom: calc(var(--spacing-unit) * 3);
}

.tool-card-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--color-brand);
}

.tool-card-domain {
    color: var(--color-text-secondary);
    font-family: var(--font-mono);
}

/* ==========================================================================
   7. Vorteile Section
   ========================================================================== */
.vorteile-section {
    background-color: var(--color-bg-secondary);
    border-top: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
}

.vorteile-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: calc(var(--spacing-unit) * 4);
}

.vorteil-card {
    text-align: center;
}

.vorteil-icon-wrapper {
    display: inline-flex;
    padding: calc(var(--spacing-unit) * 1.5);
    border-radius: 50%;
    margin-bottom: calc(var(--spacing-unit) * 2);
}

.vorteil-icon-wrapper.icon-emerald { background-color: #d1fae5; color: #059669; }
.vorteil-icon-wrapper.icon-brand { background-color: #e0e7ff; color: #4f46e5; }
.vorteil-icon-wrapper.icon-amber { background-color: #fef3c7; color: #d97706; }
.dark .vorteil-icon-wrapper.icon-emerald { background-color: #064e3b; color: #a7f3d0; }
.dark .vorteil-icon-wrapper.icon-brand { background-color: #3730a3; color: #c7d2fe; }
.dark .vorteil-icon-wrapper.icon-amber { background-color: #78350f; color: #fde68a; }

.vorteil-title {
    font-size: 1.2rem;
    margin-bottom: var(--spacing-unit);
}

.vorteil-description {
    color: var(--color-text-secondary);
}

/* ==========================================================================
   8. Footer
   ========================================================================== */
.footer {
    padding: calc(var(--spacing-unit) * 4) 0;
    color: var(--color-text-secondary);
    font-size: 0.9rem;
}

.footer-inner {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: calc(var(--spacing-unit) * 2);
    padding: 0 calc(var(--spacing-unit) * 2);
}

.footer-brand {
    display: flex;
    align-items: center;
    gap: var(--spacing-unit);
}

.footer-brand-icon { color: var(--color-text-secondary); }
.footer-brand-text { font-weight: 600; color: var(--color-text-primary); }
.footer-separator { display: none; }

.footer-links {
    display: flex;
    gap: calc(var(--spacing-unit) * 2);
}

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

/* ==========================================================================
   9. Utility Classes
   ========================================================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-unit);
    font-weight: 600;
    padding: calc(var(--spacing-unit) * 1.25) calc(var(--spacing-unit) * 2.5);
    border-radius: var(--border-radius-sm);
    border: 1px solid transparent;
    cursor: pointer;
    transition: all 0.2s;
}

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

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

.btn-icon {
    background: none;
    border: none;
    color: var(--color-text-secondary);
    cursor: pointer;
    padding: var(--spacing-unit);
}
.btn-icon:hover {
    color: var(--color-text-primary);
}

.badge {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-unit);
    padding: var(--spacing-unit) calc(var(--spacing-unit) * 1.5);
    border-radius: 9999px;
    font-size: 0.85rem;
    font-weight: 500;
}

.badge.badge-emerald {
    background-color: #d1fae5;
    color: #065f46;
}
.dark .badge.badge-emerald {
    background-color: #064e3b;
    color: #a7f3d0;
}

.badge-pulse {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background-color: var(--color-emerald);
    animation: pulse 2s infinite;
}

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

/* ==========================================================================
   10. Responsive Styles (Tablet & Desktop)
   ========================================================================== */
@media (min-width: 768px) {
    .hero-title { font-size: 3.5rem; }
    .hero-subtitle { font-size: 1.25rem; }
    .section-title { font-size: 2.5rem; }

    .nav-desktop { display: flex; align-items: center; gap: var(--spacing-unit); }
    .btn-cta { display: inline-flex; }
    .mobile-menu-btn { display: none; }

    .tools-grid { grid-template-columns: repeat(2, 1fr); }
    .vorteile-grid { grid-template-columns: repeat(3, 1fr); }

    .footer-inner { flex-direction: row; justify-content: space-between; }
    .footer-brand .footer-separator { display: inline; }
}

@media (min-width: 1024px) {
    .tools-grid { grid-template-columns: repeat(3, 1fr); }
}