/* ============================================================================
   VeriFactu-Pro Landing Page Styles
   Design System - CSS Variables & Base Styles
   ============================================================================ */

/* ============================================================================
   CSS CUSTOM PROPERTIES (Design Tokens)
   ============================================================================ */

:root {
    /* Color Palette - Primary (Blues) */
    --color-primary-50: #eff6ff;
    --color-primary-100: #dbeafe;
    --color-primary-200: #bfdbfe;
    --color-primary-300: #93c5fd;
    --color-primary-400: #60a5fa;
    --color-primary-500: #3b82f6;
    --color-primary-600: #0066CC;
    --color-primary-700: #1d4ed8;
    --color-primary-800: #1e40af;
    --color-primary-900: #1e3a8a;

    /* Color Palette - Secondary (Purples) */
    --color-secondary-50: #f5f3ff;
    --color-secondary-100: #ede9fe;
    --color-secondary-200: #ddd6fe;
    --color-secondary-300: #c4b5fd;
    --color-secondary-400: #a78bfa;
    --color-secondary-500: #8b5cf6;
    --color-secondary-600: #7c3aed;
    --color-secondary-700: #6d28d9;
    --color-secondary-800: #5b21b6;
    --color-secondary-900: #4c1d95;

    /* Color Palette - Neutral (Grays) */
    --color-neutral-0: #ffffff;
    --color-neutral-50: #f9fafb;
    --color-neutral-100: #f3f4f6;
    --color-neutral-200: #e5e7eb;
    --color-neutral-300: #d1d5db;
    --color-neutral-400: #9ca3af;
    --color-neutral-500: #6b7280;
    --color-neutral-600: #4b5563;
    --color-neutral-700: #374151;
    --color-neutral-800: #1f2937;
    --color-neutral-900: #111827;

    /* Color Palette - Semantic */
    --color-success-100: #d1fae5;
    --color-success-500: #10b981;
    --color-success-600: #059669;
    --color-success-700: #047857;

    --color-warning-100: #fef3c7;
    --color-warning-500: #f59e0b;
    --color-warning-700: #b45309;

    --color-error-100: #fee2e2;
    --color-error-500: #ef4444;
    --color-error-700: #b91c1c;

    --color-info-100: #dbeafe;
    --color-info-500: #3b82f6;
    --color-info-700: #1d4ed8;

    /* Typography - Font Families */
    --font-family-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-family-mono: 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', Consolas, 'Courier New', monospace;

    /* Typography - Font Sizes */
    --font-size-xs: 0.75rem;      /* 12px */
    --font-size-sm: 0.875rem;     /* 14px */
    --font-size-base: 1rem;       /* 16px */
    --font-size-lg: 1.125rem;     /* 18px */
    --font-size-xl: 1.25rem;      /* 20px */
    --font-size-2xl: 1.5rem;      /* 24px */
    --font-size-3xl: 1.875rem;    /* 30px */
    --font-size-4xl: 2.25rem;     /* 36px */
    --font-size-5xl: 3rem;        /* 48px */
    --font-size-6xl: 3.75rem;     /* 60px */

    /* Typography - Font Weights */
    --font-weight-light: 300;
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
    --font-weight-extrabold: 800;
    --font-weight-black: 900;

    /* Typography - Line Heights */
    --line-height-none: 1;
    --line-height-tight: 1.25;
    --line-height-snug: 1.375;
    --line-height-normal: 1.5;
    --line-height-relaxed: 1.625;
    --line-height-loose: 2;

    /* Spacing Scale */
    --space-0: 0;
    --space-1: 0.25rem;   /* 4px */
    --space-2: 0.5rem;    /* 8px */
    --space-3: 0.75rem;   /* 12px */
    --space-4: 1rem;      /* 16px */
    --space-5: 1.25rem;   /* 20px */
    --space-6: 1.5rem;    /* 24px */
    --space-8: 2rem;      /* 32px */
    --space-10: 2.5rem;   /* 40px */
    --space-12: 3rem;     /* 48px */
    --space-16: 4rem;     /* 64px */
    --space-20: 5rem;     /* 80px */
    --space-24: 6rem;     /* 96px */

    /* Border Radius */
    --radius-none: 0;
    --radius-sm: 0.125rem;    /* 2px */
    --radius-base: 0.25rem;   /* 4px */
    --radius-md: 0.375rem;    /* 6px */
    --radius-lg: 0.5rem;      /* 8px */
    --radius-xl: 0.75rem;     /* 12px */
    --radius-2xl: 1rem;       /* 16px */
    --radius-3xl: 1.5rem;     /* 24px */
    --radius-full: 9999px;

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-base: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);

    /* Transitions */
    --transition-base: all 0.2s ease-in-out;
    --transition-fast: all 0.15s ease-in-out;
    --transition-slow: all 0.3s ease-in-out;

    /* Animation Durations */
    --animation-duration-fast: 0.15s;
    --animation-duration-base: 0.2s;
    --animation-duration-slow: 0.3s;
    --animation-duration-slower: 0.5s;

    /* Animation Easings */
    --animation-easing-linear: linear;
    --animation-easing-ease-in: ease-in;
    --animation-easing-ease-out: ease-out;
    --animation-easing-ease-in-out: ease-in-out;

    /* Z-Index Scale */
    --z-dropdown: 1000;
    --z-sticky: 1020;
    --z-fixed: 1030;
    --z-modal-backdrop: 1040;
    --z-modal: 1050;
    --z-popover: 1060;
    --z-tooltip: 1070;

    /* Breakpoints (for reference in media queries) */
    --breakpoint-sm: 640px;
    --breakpoint-md: 768px;
    --breakpoint-lg: 1024px;
    --breakpoint-xl: 1280px;
    --breakpoint-2xl: 1536px;
}

/* ============================================================================
   BASE STYLES & RESET
   ============================================================================ */

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

html {
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family-sans);
    font-size: var(--font-size-base);
    line-height: var(--line-height-normal);
    color: var(--color-neutral-900);
    background-color: var(--color-neutral-0);
    min-height: 100vh;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: var(--font-weight-bold);
    line-height: var(--line-height-tight);
    color: var(--color-neutral-900);
}

h1 {
    font-size: var(--font-size-4xl);
}

h2 {
    font-size: var(--font-size-3xl);
}

h3 {
    font-size: var(--font-size-2xl);
}

h4 {
    font-size: var(--font-size-xl);
}

h5 {
    font-size: var(--font-size-lg);
}

h6 {
    font-size: var(--font-size-base);
}

p {
    margin-bottom: var(--space-4);
}

a {
    color: var(--color-primary-600);
    text-decoration: none;
    transition: var(--transition-base);
}

a:hover {
    color: var(--color-primary-700);
}

/* Lists */
ul, ol {
    list-style: none;
}

/* Images */
img {
    max-width: 100%;
    height: auto;
    display: block;
}

/* ============================================================================
   LAYOUT CONTAINERS
   ============================================================================ */

.container {
    width: 100%;
    max-width: 1280px;
    margin-left: auto;
    margin-right: auto;
    padding-left: var(--space-4);
    padding-right: var(--space-4);
}

@media (min-width: 640px) {
    .container {
        padding-left: var(--space-6);
        padding-right: var(--space-6);
    }
}

@media (min-width: 1024px) {
    .container {
        padding-left: var(--space-8);
        padding-right: var(--space-8);
    }
}

/* ============================================================================
   UTILITY CLASSES
   ============================================================================ */

/* Accessibility - Skip to main content */
.skip-to-main {
    position: absolute;
    left: -9999px;
    z-index: 999;
    padding: var(--space-4);
    background-color: var(--color-primary-600);
    color: white;
    text-decoration: none;
    border-radius: var(--radius-md);
}

.skip-to-main:focus {
    left: var(--space-4);
    top: var(--space-4);
}

/* Scroll Reveal Animation */
.scroll-reveal {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.scroll-reveal.revealed {
    opacity: 1;
    transform: translateY(0);
}

/* ============================================================================
   ANIMATIONS
   ============================================================================ */

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideInLeft {
    from {
        opacity: 0;
        transform: translateX(-20px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(20px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

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

@keyframes spin {
    from {
        transform: rotate(0deg);
    }
    to {
        transform: rotate(360deg);
    }
}

/* ============================================================================
   RESPONSIVE UTILITIES
   ============================================================================ */

/* Hide on mobile */
@media (max-width: 767px) {
    .hide-mobile {
        display: none !important;
    }
}

/* Hide on desktop */
@media (min-width: 768px) {
    .hide-desktop {
        display: none !important;
    }
}

/* ============================================================================
   FEATURE CARD MOLECULE STYLES
   ============================================================================ */

.feature-card-molecule {
    padding: var(--space-6);
    background: var(--color-neutral-0);
    border: 1px solid var(--color-neutral-200);
    border-radius: var(--radius-lg);
    transition: all var(--transition-base);
    height: 100%;
    display: flex;
    flex-direction: column;
}

.feature-card-molecule:hover {
    border-color: var(--color-primary-300);
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
}

/* Icon */
.feature-icon-wrapper {
    width: 56px;
    height: 56px;
    background: var(--color-primary-50);
    color: var(--color-primary-600);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--space-4);
    transition: all var(--transition-base);
}

.feature-icon-wrapper i {
    font-size: 1.75rem;
}

.feature-card-molecule:hover .feature-icon-wrapper {
    background: var(--color-primary-100);
    transform: scale(1.1);
}

/* Content */
.feature-title {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-semibold);
    color: var(--color-neutral-900);
    margin-bottom: var(--space-2);
    line-height: var(--line-height-tight);
}

.feature-description {
    font-size: var(--font-size-base);
    color: var(--color-neutral-600);
    line-height: var(--line-height-relaxed);
    margin-bottom: var(--space-3);
    flex: 1;
}

/* Link */
.feature-link {
    display: inline-flex;
    align-items: center;
    gap: 0.375rem;
    color: var(--color-primary-600);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    text-decoration: none;
    transition: all var(--transition-fast);
}

.feature-link:hover {
    color: var(--color-primary-700);
    gap: 0.625rem;
}

.feature-link i {
    font-size: 0.875rem;
    transition: transform var(--transition-fast);
}

.feature-link:hover i {
    transform: translateX(2px);
}

/* Responsive */
@media (max-width: 640px) {
    .feature-card-molecule {
        padding: var(--space-5);
    }

    .feature-icon-wrapper {
        width: 48px;
        height: 48px;
    }

    .feature-icon-wrapper i {
        font-size: 1.5rem;
    }
}

/* ============================================================================
   LOGO CLOUD ITEM MOLECULE STYLES
   ============================================================================ */

.logo-cloud-item-molecule {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-4);
    background: var(--color-neutral-0);
    border: 1px solid var(--color-neutral-200);
    border-radius: var(--radius-base);
    transition: all var(--transition-fast);
    min-height: 80px;
}

a.logo-cloud-item-molecule:hover {
    border-color: var(--color-primary-300);
    box-shadow: var(--shadow-sm);
    transform: translateY(-2px);
}

.logo-image {
    max-width: 120px;
    max-height: 40px;
    width: auto;
    height: auto;
    object-fit: contain;
    opacity: 0.7;
    transition: opacity var(--transition-fast);
    filter: grayscale(100%);
}

.logo-cloud-item-molecule:hover .logo-image {
    opacity: 1;
    filter: grayscale(0%);
}

.logo-fallback {
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    color: var(--color-neutral-600);
    text-align: center;
}

/* Responsive */
@media (max-width: 640px) {
    .logo-cloud-item-molecule {
        min-height: 60px;
        padding: var(--space-3);
    }

    .logo-image {
        max-width: 100px;
        max-height: 32px;
    }
}

/* ============================================================================
   PRINT STYLES
   ============================================================================ */

@media print {
    body {
        background: white;
        color: black;
    }

    .no-print {
        display: none !important;
    }

    a {
        text-decoration: underline;
    }

    a[href]:after {
        content: " (" attr(href) ")";
    }
}