/* ============================================
   PAYLIO WEBSITE - MAIN STYLES
   ============================================ */

/* CSS Custom Properties */
:root {
    /* Brand Colors */
    --primary-blue: #0544d1;
    --secondary-blue: #407dfc;
    --soft-blue: #a4d2f2;
    --bright-green: #bee648;
    --dark-bg: #eff6ff;
    --darker-bg: #e8f0fe;
    --accent-green: #bee648;
    --success-green: #10b981;
    --error-red: #ef4444;
    --calm-grey: #eeece9;

    /* Surface Colors */
    --surface-dark: #ffffff;
    --surface-darker: #f8fafc;
    --surface-card: rgba(255, 255, 255, 0.9);
    --surface-card-hover: rgba(255, 255, 255, 1);

    /* Text Colors */
    --text-primary: #16172f;
    --text-secondary: #2d2f3a;
    --text-muted: #3b3d4a;
    --text-dark: #16172f;
    --text-inverse: #ffffff;

    /* Borders */
    --border-light: rgba(5, 68, 209, 0.15);
    --border-medium: rgba(5, 68, 209, 0.3);
    --border-card: #0544d1;

    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #eff6ff 0%, #407dfc 50%, #0544d1 100%);
    --gradient-hero: linear-gradient(135deg, #eff6ff 0%, #407dfc 60%, #0544d1 100%);
    --gradient-accent: linear-gradient(135deg, #bee648 0%, #a8d030 100%);
    --gradient-card: linear-gradient(145deg, rgba(255,255,255,0.95) 0%, rgba(255,255,255,0.85) 100%);

    /* Shadows */
    --shadow-sm: 0 2px 4px rgba(5, 68, 209, 0.08);
    --shadow-md: 0 4px 12px rgba(5, 68, 209, 0.12);
    --shadow-lg: 0 8px 30px rgba(5, 68, 209, 0.15);
    --shadow-xl: 0 20px 50px rgba(5, 68, 209, 0.2);
    --shadow-glow: 0 0 30px rgba(64, 125, 252, 0.2);

    /* Spacing */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    --space-3xl: 4rem;
    --space-4xl: 6rem;

    /* Typography */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-display: 'Inter', sans-serif;

    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-2xl: 24px;
    --radius-full: 9999px;

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 400ms ease;

    /* Container widths */
    --container-sm: 640px;
    --container-md: 768px;
    --container-lg: 1024px;
    --container-xl: 1280px;
    --container-max: 1400px;
}

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

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

body {
    font-family: var(--font-sans);
    line-height: 1.6;
    color: var(--text-primary);
    background: var(--dark-bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-display);
    font-weight: 700;
    line-height: 1.2;
    letter-spacing: -0.02em;
}

h1 { font-size: clamp(2.5rem, 5vw, 4rem); }
h2 { font-size: clamp(2rem, 4vw, 3rem); }
h3 { font-size: clamp(1.5rem, 3vw, 2rem); }
h4 { font-size: clamp(1.25rem, 2vw, 1.5rem); }
h5 { font-size: 1.125rem; }
h6 { font-size: 1rem; }

p {
    color: var(--text-secondary);
    font-size: 1.125rem;
    line-height: 1.7;
}

a {
    color: var(--secondary-blue);
    text-decoration: none;
    transition: color var(--transition-fast);
}

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

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

/* Container */
.container {
    width: 100%;
    max-width: var(--container-xl);
    margin: 0 auto;
    padding: 0 var(--space-lg);
}

.container-sm {
    max-width: var(--container-md);
}

.container-lg {
    max-width: var(--container-max);
}

/* Section Spacing */
section {
    padding: var(--space-4xl) 0;
}

.section-header {
    text-align: center;
    max-width: 700px;
    margin: 0 auto var(--space-3xl);
}

.section-header h2 {
    margin-bottom: var(--space-md);
}

.section-header p {
    color: var(--text-muted);
}

/* Accent Text */
.gradient-text {
    color: var(--text-primary);
}

.gradient-text-accent {
    color: var(--bright-green);
}

/* ============================================
   HEADER / NAVIGATION
   ============================================ */

.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: var(--space-md) 0;
    transition: all var(--transition-base);
}

.header.scrolled {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    box-shadow: 0 4px 30px rgba(5, 68, 209, 0.1);
}

.nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.logo img {
    height: 70px;
    width: auto;
}

.logo-icon {
    height: 72px;
    width: auto;
}

.logo-text-img {
    height: 42px;
    width: auto;
}

.logo-text {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
}

.nav-links {
    display: flex;
    align-items: center;
    gap: var(--space-xl);
    list-style: none;
}

.nav-link {
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 0.95rem;
    transition: color var(--transition-fast);
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient-primary);
    transition: width var(--transition-base);
}

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

.nav-link:hover::after,
.nav-link.active::after {
    width: 100%;
}

.nav-cta {
    margin-left: var(--space-md);
}

/* Mobile Menu Toggle */
.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    padding: var(--space-sm);
    z-index: 1001;
    background: transparent;
    border: none;
}

.mobile-menu-toggle span {
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    transition: all var(--transition-base);
    transform-origin: center;
}

.mobile-menu-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.mobile-menu-toggle.active span:nth-child(2) {
    opacity: 0;
}

.mobile-menu-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* Mobile Navigation */
@media (max-width: 768px) {
    .nav-links {
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        width: 100vw;
        height: 100vh;
        background-color: #ffffff;
        flex-direction: column;
        justify-content: center;
        align-items: center;
        gap: var(--space-xl);
        opacity: 0;
        visibility: hidden;
        transition: all var(--transition-base);
        padding: 0;
        margin: 0;
        z-index: 999;
    }

    .nav-links.active {
        opacity: 1;
        visibility: visible;
    }

    .nav-links li {
        list-style: none;
    }

    .nav-link {
        font-size: 1.5rem;
        color: #ffffff;
    }

    .mobile-menu-toggle {
        display: flex;
        z-index: 1001;
    }

    .nav-cta {
        margin-left: 0;
    }

    /* Center hero image on mobile */
    .hero-image {
        display: flex;
        justify-content: center;
        align-items: center;
        width: 100%;
    }

    .hero-image .phone-mockup {
        display: flex;
        justify-content: center;
        margin: 0 auto;
    }

    .hero-image .phone-frame {
        margin: 0 auto;
    }

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

/* ============================================
   FOOTER
   ============================================ */

.footer {
    background: var(--darker-bg);
    padding: var(--space-4xl) 0 var(--space-xl);
    border-top: 1px solid var(--border-light);
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr repeat(3, 1fr);
    gap: var(--space-3xl);
    margin-bottom: var(--space-3xl);
}

.footer-brand p {
    margin-top: var(--space-md);
    color: var(--text-muted);
    font-size: 0.95rem;
    max-width: 300px;
}

.footer-title {
    font-size: 0.875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--text-primary);
    margin-bottom: var(--space-lg);
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: var(--space-sm);
}

.footer-links a {
    color: var(--text-muted);
    font-size: 0.95rem;
    transition: color var(--transition-fast);
}

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

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: var(--space-xl);
    border-top: 1px solid var(--border-light);
}

.footer-bottom p {
    color: var(--text-muted);
    font-size: 0.875rem;
}

.footer-social {
    display: flex;
    gap: var(--space-md);
}

.footer-social a {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-full);
    background: var(--surface-card);
    color: var(--text-secondary);
    transition: all var(--transition-base);
}

.footer-social a:hover {
    background: var(--primary-blue);
    color: var(--text-primary);
    transform: translateY(-3px);
}

@media (max-width: 768px) {
    .footer-grid {
        grid-template-columns: 1fr 1fr;
        gap: var(--space-xl);
    }

    .footer-brand {
        grid-column: 1 / -1;
    }

    .footer-bottom {
        flex-direction: column;
        gap: var(--space-md);
        text-align: center;
    }
}

@media (max-width: 480px) {
    .footer-grid {
        grid-template-columns: 1fr;
    }
}

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

/* Text alignment */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

/* Display */
.hidden { display: none; }
.block { display: block; }
.inline-block { display: inline-block; }
.flex { display: flex; }
.inline-flex { display: inline-flex; }
.grid { display: grid; }

/* Flex utilities */
.flex-center {
    display: flex;
    align-items: center;
    justify-content: center;
}

.flex-between {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.flex-col {
    flex-direction: column;
}

.flex-wrap {
    flex-wrap: wrap;
}

.gap-sm { gap: var(--space-sm); }
.gap-md { gap: var(--space-md); }
.gap-lg { gap: var(--space-lg); }
.gap-xl { gap: var(--space-xl); }

/* Margins */
.mt-sm { margin-top: var(--space-sm); }
.mt-md { margin-top: var(--space-md); }
.mt-lg { margin-top: var(--space-lg); }
.mt-xl { margin-top: var(--space-xl); }
.mt-2xl { margin-top: var(--space-2xl); }

.mb-sm { margin-bottom: var(--space-sm); }
.mb-md { margin-bottom: var(--space-md); }
.mb-lg { margin-bottom: var(--space-lg); }
.mb-xl { margin-bottom: var(--space-xl); }
.mb-2xl { margin-bottom: var(--space-2xl); }

/* Padding */
.p-md { padding: var(--space-md); }
.p-lg { padding: var(--space-lg); }
.p-xl { padding: var(--space-xl); }

.py-sm { padding-top: var(--space-sm); padding-bottom: var(--space-sm); }
.py-md { padding-top: var(--space-md); padding-bottom: var(--space-md); }
.py-lg { padding-top: var(--space-lg); padding-bottom: var(--space-lg); }
.py-xl { padding-top: var(--space-xl); padding-bottom: var(--space-xl); }

/* Width */
.w-full { width: 100%; }
.max-w-sm { max-width: var(--container-sm); }
.max-w-md { max-width: var(--container-md); }

/* Colors */
.text-primary { color: var(--text-primary); }
.text-secondary { color: var(--text-secondary); }
.text-muted { color: var(--text-muted); }
.text-accent { color: var(--accent-orange); }
.text-success { color: var(--success-green); }

.bg-dark { background: var(--dark-bg); }
.bg-darker { background: var(--darker-bg); }
.bg-surface { background: var(--surface-dark); }

/* Responsive utilities */
@media (max-width: 768px) {
    .hide-mobile { display: none !important; }
}

@media (min-width: 769px) {
    .hide-desktop { display: none !important; }
}