/* ============================================
   RESIGUARD SHARED CORE STYLES
   ============================================ */

/* ===== 1. CSS RESET & BASE STYLES ===== */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

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

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

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

a {
    text-decoration: none;
    color: inherit;
}

button {
    font-family: inherit;
    border: none;
    background: none;
    cursor: pointer;
}

/* ===== 2. CSS CUSTOM PROPERTIES (DESIGN TOKENS) ===== */
:root {
    /* Colors */
    --color-primary: #4A90A4;
    --color-primary-dark: #3A7080;
    --color-primary-light: #E8F4F8;
    --color-secondary: #F5F5F5;
    --color-text: #2C3E50;
    --color-text-light: #5A6C7D;
    --color-white: #FFFFFF;
    --color-success: #10B981;
    --color-warning: #F59E0B;

    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-size-hero: clamp(28px, 7vw, 52px);
    --font-size-h2: clamp(24px, 5vw, 40px);
    --font-size-h3: clamp(18px, 4vw, 24px);
    --font-size-body: 16px;
    --font-size-small: 14px;
    --font-weight-light: 300;
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;

    /* Spacing */
    --spacing-xs: 8px;
    --spacing-sm: 16px;
    --spacing-md: 24px;
    --spacing-lg: 40px;
    --spacing-xl: 60px;

    /* Layout */
    --max-width: 1200px;
    --border-radius: 16px;
    --border-radius-sm: 8px;
    --tap-target: 44px;

    /* Shadows - Layered for depth (Pro Max style) */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --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);

    /* Transitions */
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-bounce: 0.5s cubic-bezier(0.68, -0.55, 0.265, 1.55);

    /* Semantic Tokens (Light Mode Default) */
    --bg-body: var(--color-white);
    --bg-surface: var(--color-white);
    --bg-secondary: var(--color-secondary);
    --bg-input: rgba(255, 255, 255, 0.9);
    --text-main: var(--color-text);
    --text-muted: var(--color-text-light);
    --border-color: #E2E8F0;
}

@media (prefers-color-scheme: dark) {
    :root {
        /* Dark Mode Overrides (Slate Theme) */
        --bg-body: #0F172A;
        /* Slate 900 */
        --bg-surface: #1E293B;
        /* Slate 800 */
        --bg-secondary: #020617;
        /* Slate 950 */
        --bg-input: #1E293B;

        --text-main: #F1F5F9;
        /* Slate 100 */
        --text-muted: #94A3B8;
        /* Slate 400 */

        --color-primary: #38BDF8;
        /* Sky 400 (Brighter for dark mode) */
        --color-primary-dark: #0EA5E9;
        /* Sky 500 */
        --color-primary-light: #164E63;
        /* Cyan 900 (Darker for gradients) */
        --border-color: #334155;
        /* Slate 700 */

        /* Strengthen shadows for dark mode */
        --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
        --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, 0.3), 0 4px 6px -2px rgba(0, 0, 0, 0.2);
        --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.4), 0 10px 10px -5px rgba(0, 0, 0, 0.2);
    }

    img {
        opacity: 0.9;
        /* Slight dimming for images in dark mode */
    }
}

/* ===== 3. TYPOGRAPHY ===== */
h1,
h2,
h3,
h4,
h5,
h6 {
    line-height: 1.2;
    font-weight: var(--font-weight-bold);
    margin-bottom: var(--spacing-sm);
}

.section-title {
    font-size: var(--font-size-h2);
    text-align: center;
    margin-bottom: var(--spacing-lg);
    color: var(--text-main);
}

/* ===== 4. LAYOUT & GRID SYSTEM ===== */
.container {
    width: 100%;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-sm);
}

@media (min-width: 768px) {
    .container {
        padding: 0 var(--spacing-lg);
    }
}

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

/* ===== 5. SHARED COMPONENTS ===== */

/* Buttons */
.btn {
    display: inline-block;
    padding: 14px 28px;
    font-size: var(--font-size-body);
    font-weight: var(--font-weight-semibold);
    text-align: center;
    border-radius: var(--border-radius-sm);
    transition: all var(--transition);
    min-height: var(--tap-target);
    touch-action: manipulation;
}

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

.btn--primary:hover {
    background-color: var(--color-primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn--primary:active {
    transform: translateY(0);
}

.btn--large {
    width: 100%;
    padding: 18px 32px;
    font-size: 18px;
    min-height: 60px;
}

@media (min-width: 768px) {
    .btn--large {
        width: auto;
        min-width: 300px;
    }
}

/* Cards */
.card {
    background: var(--bg-surface);
    border-radius: var(--border-radius);
    padding: var(--spacing-md);
    box-shadow: var(--shadow-md);
    text-align: center;
    transition: transform var(--transition);
}

.card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
}

.card__icon {
    width: 48px;
    height: 48px;
    margin: 0 auto var(--spacing-sm);
    color: var(--color-primary);
}

.card__icon svg {
    width: 100%;
    height: 100%;
}

.card__title {
    font-size: var(--font-size-h3);
    margin-bottom: var(--spacing-sm);
}

.card__text {
    color: var(--text-muted);
    margin-bottom: var(--spacing-xs);
}

.card__list {
    list-style: none;
    text-align: left;
}

.card__list li {
    padding: var(--spacing-xs) 0;
    color: var(--text-muted);
}

.card__value {
    color: var(--color-primary);
    font-weight: var(--font-weight-semibold);
    font-size: var(--font-size-small);
}

.card--featured {
    border: 2px solid var(--color-primary-light);
}

.cards {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

@media (min-width: 768px) {
    .cards {
        grid-template-columns: repeat(3, 1fr);
    }
}

/* ===== UTILITIES ===== */
.mb-lg {
    margin-bottom: var(--spacing-lg);
}

/* Animations - Basic */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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