/* Professional Apple-style CSS with Dark Mode Support */

:root {
    /* Light mode colors */
    --primary: #0071e3;
    --primary-hover: #0077ed;
    --accent: #ef4444; /* Red accent for slash */
    --text-primary: #1d1d1f;
    --text-secondary: #86868b;
    --text-tertiary: #515154;
    --background: #ffffff;
    --background-secondary: #f5f5f7;
    --background-tertiary: #fbfbfd;
    --card-background: #ffffff;
    --border-color: #d2d2d7;
    --border-light: #e8e8ed;
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.12);
    --navbar-bg: rgba(255, 255, 255, 0.8);
    --footer-bg: #f5f5f7;
    
    /* Typography */
    --font-primary: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", "Helvetica Neue", "Helvetica", "Arial", sans-serif;
    --font-weight-regular: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
    
    /* Spacing */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --spacing-2xl: 48px;
    --spacing-3xl: 64px;
    
    /* Border radius */
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 14px;
    --radius-xl: 18px;
    
    /* Transitions */
    --transition-base: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-fast: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Dark mode */
@media (prefers-color-scheme: dark) {
    :root {
        --primary: #2997ff;
        --primary-hover: #409cff;
        --accent: #ff453a;
        --text-primary: #f5f5f7;
        --text-secondary: #86868b;
        --text-tertiary: #98989f;
        --background: #000000;
        --background-secondary: #161617;
        --background-tertiary: #1d1d1f;
        --card-background: #1d1d1f;
        --border-color: #424245;
        --border-light: #2d2d30;
        --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
        --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
        --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.5);
        --navbar-bg: rgba(0, 0, 0, 0.8);
        --footer-bg: #161617;
    }
}

/* Dark mode toggle support */
body.dark-mode {
    --primary: #2997ff;
    --primary-hover: #409cff;
    --accent: #ff453a;
    --text-primary: #f5f5f7;
    --text-secondary: #86868b;
    --text-tertiary: #98989f;
    --background: #000000;
    --background-secondary: #161617;
    --background-tertiary: #1d1d1f;
    --card-background: #1d1d1f;
    --border-color: #424245;
    --border-light: #2d2d30;
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.5);
    --navbar-bg: rgba(0, 0, 0, 0.8);
    --footer-bg: #161617;
}

/* Reset and base styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

body {
    font-family: var(--font-primary);
    font-size: 17px;
    line-height: 1.47059;
    font-weight: var(--font-weight-regular);
    color: var(--text-primary);
    background-color: var(--background);
    transition: var(--transition-base);
    letter-spacing: -0.022em;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: var(--font-weight-semibold);
    letter-spacing: -0.025em;
    color: var(--text-primary);
    margin: 0;
}

h1 {
    font-size: 48px;
    line-height: 1.08349;
    font-weight: var(--font-weight-bold);
    letter-spacing: -0.003em;
}

h2 {
    font-size: 40px;
    line-height: 1.1;
    font-weight: var(--font-weight-bold);
}

h3 {
    font-size: 32px;
    line-height: 1.125;
}

h4 {
    font-size: 24px;
    line-height: 1.16667;
}

h5 {
    font-size: 20px;
    line-height: 1.2;
}

h6 {
    font-size: 17px;
    line-height: 1.23536;
}

p {
    margin: 0 0 var(--spacing-md);
    color: var(--text-secondary);
}

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

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

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

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

/* Professional button styles */
.btn-professional {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 24px;
    font-size: 17px;
    font-weight: var(--font-weight-regular);
    border-radius: var(--radius-lg);
    transition: var(--transition-fast);
    cursor: pointer;
    border: none;
    text-decoration: none;
    line-height: 1.23536;
    gap: var(--spacing-sm);
    white-space: nowrap;
}

.btn-professional-primary {
    background: var(--primary);
    color: #ffffff;
}

.btn-professional-primary:hover {
    background: var(--primary-hover);
    transform: scale(1.015);
}

.btn-professional-secondary {
    background: transparent;
    color: var(--primary);
    border: 1px solid var(--border-color);
}

.btn-professional-secondary:hover {
    background: var(--background-secondary);
    border-color: var(--primary);
}

/* Card styles */
.card-professional {
    background: var(--card-background);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-light);
    transition: var(--transition-base);
}

.card-professional:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

/* Section spacing */
.section {
    padding: var(--spacing-3xl) 0;
}

.section-title {
    font-size: 48px;
    line-height: 1.08349;
    font-weight: var(--font-weight-bold);
    text-align: center;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.section-subtitle {
    font-size: 21px;
    line-height: 1.381;
    text-align: center;
    margin-bottom: var(--spacing-2xl);
    color: var(--text-secondary);
    max-width: 720px;
    margin-left: auto;
    margin-right: auto;
}

/* Logo with slash */
.logo-brand {
    font-size: 24px;
    font-weight: var(--font-weight-semibold);
    color: var(--text-primary);
    letter-spacing: -0.5px;
}

.logo-slash {
    color: var(--accent);
    font-weight: 300;
    margin: 0 -2px;
}

/* Responsive typography */
@media (max-width: 768px) {
    h1 {
        font-size: 32px;
    }
    
    h2 {
        font-size: 28px;
    }
    
    h3 {
        font-size: 24px;
    }
    
    .section-title {
        font-size: 32px;
    }
    
    .section-subtitle {
        font-size: 19px;
    }
}

/* Utility classes */
.text-center { text-align: center; }
.text-muted { color: var(--text-secondary); }
.font-weight-medium { font-weight: var(--font-weight-medium); }
.font-weight-semibold { font-weight: var(--font-weight-semibold); }
.font-weight-bold { font-weight: var(--font-weight-bold); }

/* Spacing utilities */
.mt-1 { margin-top: var(--spacing-xs); }
.mt-2 { margin-top: var(--spacing-sm); }
.mt-3 { margin-top: var(--spacing-md); }
.mt-4 { margin-top: var(--spacing-lg); }
.mt-5 { margin-top: var(--spacing-xl); }

.mb-1 { margin-bottom: var(--spacing-xs); }
.mb-2 { margin-bottom: var(--spacing-sm); }
.mb-3 { margin-bottom: var(--spacing-md); }
.mb-4 { margin-bottom: var(--spacing-lg); }
.mb-5 { margin-bottom: var(--spacing-xl); }

.pt-1 { padding-top: var(--spacing-xs); }
.pt-2 { padding-top: var(--spacing-sm); }
.pt-3 { padding-top: var(--spacing-md); }
.pt-4 { padding-top: var(--spacing-lg); }
.pt-5 { padding-top: var(--spacing-xl); }

.pb-1 { padding-bottom: var(--spacing-xs); }
.pb-2 { padding-bottom: var(--spacing-sm); }
.pb-3 { padding-bottom: var(--spacing-md); }
.pb-4 { padding-bottom: var(--spacing-lg); }
.pb-5 { padding-bottom: var(--spacing-xl); }

/* Icon styles */
.icon {
    width: 24px;
    height: 24px;
    display: inline-block;
    vertical-align: middle;
}

.icon-sm {
    width: 16px;
    height: 16px;
}

.icon-lg {
    width: 32px;
    height: 32px;
}

/* Professional navbar */
.navbar-professional {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background-color: var(--navbar-bg);
    backdrop-filter: saturate(180%) blur(20px);
    -webkit-backdrop-filter: saturate(180%) blur(20px);
    border-bottom: 1px solid var(--border-light);
    z-index: 1000;
    transition: var(--transition-base);
}

.navbar-professional.scrolled {
    box-shadow: var(--shadow-sm);
}

/* Footer professional */
.footer-professional {
    background-color: var(--footer-bg);
    border-top: 1px solid var(--border-light);
    padding: var(--spacing-2xl) 0;
}

.footer-copyright {
    color: var(--text-secondary);
    font-size: 14px;
    text-align: center;
}