/* SYSNAV M-Pesa Gateway - Apple & Amazon Design System */

:root {
    /* Color Palette - Apple/Amazon Inspired */
    --primary: #0071E3;
    --primary-dark: #0056B3;
    --primary-light: #E8F0FE;
    --secondary: #34C759;
    --accent: #FF9500;
    --danger: #FF3B30;
    --success: #34C759;
    --warning: #FF9500;
    
    /* Neutrals */
    --text-primary: #1D1D1F;
    --text-secondary: #646570;
    --text-tertiary: #86868B;
    --bg-primary: #FFFFFF;
    --bg-secondary: #F5F5F7;
    --bg-tertiary: #E8E8ED;
    --border-color: #D5D5D7;
    
    /* Shadows - Apple-style depth */
    --shadow-xs: 0 1px 3px rgba(0, 0, 0, 0.08);
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.12);
    --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.15);
    --shadow-xl: 0 20px 48px rgba(0, 0, 0, 0.2);
    
    /* Spacing */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 12px;
    --spacing-lg: 16px;
    --spacing-xl: 24px;
    --spacing-2xl: 32px;
    --spacing-3xl: 48px;
    
    /* Border Radius */
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    
    /* Transitions */
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
    font-size: 16px;
    line-height: 1.6;
    color: var(--text-primary);
    background: var(--bg-primary);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

h1 {
    font-size: 2.5rem;
    font-weight: 800;
}

h2 {
    font-size: 2rem;
    font-weight: 700;
}

h3 {
    font-size: 1.5rem;
    font-weight: 700;
}

h4 {
    font-size: 1.25rem;
    font-weight: 600;
}

p {
    font-size: 1rem;
    line-height: 1.8;
    color: var(--text-secondary);
}

small {
    font-size: 0.875rem;
    color: var(--text-tertiary);
}

/* Header/Navigation */
header {
    background: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
    padding: var(--spacing-3xl) var(--spacing-lg);
    text-align: center;
    box-shadow: var(--shadow-xs);
    position: sticky;
    top: 0;
    z-index: 1000;
}

header h1 {
    font-size: 2rem;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

header p {
    font-size: 1.05rem;
    color: var(--text-secondary);
    font-weight: 400;
}

/* Container */
.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

/* Sections */
section {
    margin: var(--spacing-3xl) 0;
}

section h2 {
    font-size: 2rem;
    margin-bottom: var(--spacing-2xl);
    text-align: center;
    color: var(--text-primary);
    font-weight: 700;
}

section h3 {
    color: var(--primary);
    margin-bottom: var(--spacing-lg);
    font-weight: 600;
}

section p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.8;
}

/* Grid System */
.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-2xl);
}

.grid-3 {
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

/* Cards */
.card {
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    padding: var(--spacing-2xl);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

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

/* Platform Cards */
.platform-card {
    text-align: center;
    border-top: 3px solid var(--primary);
    display: flex;
    flex-direction: column;
}

.platform-card .icon {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-lg);
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.platform-card h3 {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.platform-card p {
    flex-grow: 1;
    margin-bottom: var(--spacing-lg);
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.platform-card a {
    display: inline-block;
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--primary);
    color: var(--bg-primary);
    border-radius: var(--radius-md);
    text-decoration: none;
    transition: var(--transition);
    font-weight: 600;
    font-size: 0.9rem;
    border: none;
    cursor: pointer;
}

.platform-card a:hover {
    background: var(--primary-dark);
    transform: scale(1.02);
}

/* Feature Cards */
.feature-card {
    text-align: center;
}

.feature-card .icon {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-lg);
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.feature-card h3 {
    font-size: 1.1rem;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.feature-card p {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Flow Container */
.flow-container {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    flex-wrap: wrap;
    gap: var(--spacing-lg);
    background: var(--bg-primary);
    padding: var(--spacing-2xl);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
}

.flow-step {
    flex: 1;
    min-width: 140px;
    text-align: center;
    position: relative;
}

.flow-step:not(:last-child)::after {
    content: '→';
    position: absolute;
    right: -20px;
    top: 25px;
    font-size: 1.5rem;
    color: var(--primary);
    font-weight: 300;
}

.flow-step-number {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    background: var(--primary);
    color: var(--bg-primary);
    border-radius: 50%;
    font-weight: 700;
    font-size: 1.1rem;
    margin-bottom: var(--spacing-lg);
}

.flow-step-title {
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
    font-size: 0.95rem;
}

.flow-step-endpoint {
    font-size: 0.8rem;
    color: var(--text-tertiary);
    background: var(--bg-secondary);
    padding: var(--spacing-sm);
    border-radius: var(--radius-sm);
    margin-top: var(--spacing-md);
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
    word-break: break-all;
}

/* Endpoints Grid */
.endpoints-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--spacing-lg);
}

.endpoint-card {
    background: var(--bg-primary);
    border-left: 3px solid var(--primary);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.endpoint-card:hover {
    box-shadow: var(--shadow-md);
}

.endpoint-method {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-sm);
    background: var(--primary);
    color: var(--bg-primary);
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 700;
    margin-right: var(--spacing-sm);
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.endpoint-path {
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
    font-size: 0.85rem;
    color: var(--text-secondary);
    word-break: break-all;
    line-height: 1.6;
}

/* Error Table */
.errors-table {
    width: 100%;
    border-collapse: collapse;
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
}

.errors-table th {
    background: var(--primary);
    color: var(--bg-primary);
    padding: var(--spacing-lg);
    text-align: left;
    font-weight: 600;
    font-size: 0.95rem;
}

.errors-table td {
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--border-color);
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.errors-table tr:hover {
    background: var(--bg-secondary);
}

.error-code {
    font-weight: 600;
    color: var(--primary);
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
    font-size: 0.9rem;
}

/* Buttons */
.cta-button {
    display: inline-block;
    margin-top: var(--spacing-lg);
    padding: var(--spacing-md) var(--spacing-2xl);
    background: var(--primary);
    color: var(--bg-primary);
    text-decoration: none;
    border-radius: var(--radius-md);
    font-weight: 600;
    transition: var(--transition);
    border: 2px solid var(--primary);
    cursor: pointer;
    font-size: 0.95rem;
    letter-spacing: 0.3px;
}

.cta-button:hover {
    background: var(--primary-dark);
    border-color: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.cta-button:active {
    transform: translateY(0);
}

/* Quick Start Grid */
.quick-start-grid {
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.quick-start-grid .card {
    text-align: center;
}

.quick-start-grid .card > div:first-child {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-lg);
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.quick-start-grid h3 {
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

/* Footer */
footer {
    background: var(--text-primary);
    color: var(--bg-primary);
    padding: var(--spacing-3xl) var(--spacing-lg);
    text-align: center;
    margin-top: var(--spacing-3xl);
    border-top: 1px solid var(--border-color);
}

footer h3 {
    margin-bottom: var(--spacing-lg);
    color: var(--bg-primary);
    font-size: 1.1rem;
}

footer p {
    margin: var(--spacing-sm) 0;
    color: var(--text-tertiary);
    font-size: 0.9rem;
}

footer a {
    color: var(--primary);
    text-decoration: none;
    margin: 0 var(--spacing-sm);
    transition: var(--transition);
    font-weight: 500;
}

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

/* Code Blocks */
pre {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    overflow-x: auto;
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
    font-size: 0.85rem;
    line-height: 1.6;
    color: var(--text-primary);
}

code {
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
    font-size: 0.9em;
    background: var(--bg-secondary);
    padding: 2px 6px;
    border-radius: var(--radius-sm);
    color: var(--primary);
}

/* Lists */
ul, ol {
    margin: var(--spacing-lg) 0;
    padding-left: var(--spacing-2xl);
}

li {
    margin: var(--spacing-sm) 0;
    color: var(--text-secondary);
    line-height: 1.8;
}

/* Links */
a {
    color: var(--primary);
    text-decoration: none;
    transition: var(--transition);
    font-weight: 500;
}

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

/* Responsive Design */
@media (max-width: 768px) {
    h1 {
        font-size: 2rem;
    }

    h2 {
        font-size: 1.5rem;
    }

    h3 {
        font-size: 1.2rem;
    }

    .container {
        padding: 0 var(--spacing-sm);
    }

    section {
        margin: var(--spacing-2xl) 0;
    }

    section h2 {
        margin-bottom: var(--spacing-lg);
    }

    .grid,
    .grid-3,
    .endpoints-grid,
    .quick-start-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }

    .flow-container {
        flex-direction: column;
        padding: var(--spacing-lg);
    }

    .flow-step:not(:last-child)::after {
        content: '↓';
        right: auto;
        top: auto;
        bottom: -25px;
        font-size: 1.2rem;
    }

    .card {
        padding: var(--spacing-lg);
    }

    .platform-card a {
        width: 100%;
    }

    .errors-table {
        font-size: 0.85rem;
    }

    .errors-table th,
    .errors-table td {
        padding: var(--spacing-sm);
    }

    footer {
        padding: var(--spacing-2xl) var(--spacing-lg);
    }

    header {
        padding: var(--spacing-2xl) var(--spacing-lg);
    }

    header h1 {
        font-size: 1.5rem;
    }

    header p {
        font-size: 1rem;
    }
}

@media (max-width: 480px) {
    h1 {
        font-size: 1.5rem;
    }

    h2 {
        font-size: 1.25rem;
    }

    h3 {
        font-size: 1rem;
    }

    .container {
        padding: 0 var(--spacing-sm);
    }

    .cta-button {
        padding: var(--spacing-sm) var(--spacing-lg);
        font-size: 0.85rem;
    }

    .card {
        padding: var(--spacing-md);
    }

    .platform-card .icon,
    .feature-card .icon {
        font-size: 2rem;
    }
}

/* Print Styles */
@media print {
    body {
        background: white;
    }

    header,
    footer {
        display: none;
    }

    .card {
        page-break-inside: avoid;
    }
}footer a:hover {
    text-decoration: underline;
}

/* Responsive Design */
@media (max-width: 768px) {
    header h1 {
        font-size: 1.8em;
    }
    
    header p {
        font-size: 1em;
    }
    
    section h2 {
        font-size: 1.5em;
    }
    
    .flow-step:not(:last-child)::after {
        display: none;
    }
    
    .flow-step {
        width: 48%;
    }
    
    .quick-start-grid {
        grid-template-columns: 1fr !important;
    }
    
    .container {
        padding: 20px 10px;
    }
}

@media (max-width: 480px) {
    header h1 {
        font-size: 1.4em;
    }
    
    header {
        padding: 40px 15px;
    }
    
    .grid, .endpoints-grid {
        grid-template-columns: 1fr !important;
    }
    
    .flow-container {
        flex-direction: column;
    }
    
    .cta-button {
        padding: 12px 30px;
        font-size: 0.9em;
    }
}