/* Apple-inspired Flat Design Stylesheet */
/* Clean, minimal, white background with subtle shadows and smooth transitions */

:root {
    --primary-color: #007AFF;
    --primary-hover: #0051D5;
    --text-primary: #1D1D1F;
    --text-secondary: #86868B;
    --text-tertiary: #C7C7CC;
    --background: #FFFFFF;
    --background-secondary: #F5F5F7;
    --border-color: #D2D2D7;
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.12);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.16);
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --spacing-xs: 8px;
    --spacing-sm: 16px;
    --spacing-md: 24px;
    --spacing-lg: 32px;
    --spacing-xl: 48px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

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

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    letter-spacing: -0.02em;
    color: var(--text-primary);
}

h1 {
    font-size: 40px;
    line-height: 1.1;
}

h2 {
    font-size: 32px;
    line-height: 1.15;
}

h3 {
    font-size: 24px;
    line-height: 1.2;
}

/* Buttons - Apple Style */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 24px;
    font-size: 17px;
    font-weight: 400;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
    background: var(--primary-color);
    color: white;
    min-height: 44px; /* Apple's minimum touch target */
}

.btn:hover {
    background: var(--primary-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn:active {
    transform: translateY(0);
    box-shadow: var(--shadow-sm);
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

.btn-secondary {
    background: var(--background-secondary);
    color: var(--text-primary);
}

.btn-secondary:hover {
    background: #E8E8ED;
}

/* Input Fields - Apple Style */
.input {
    width: 100%;
    padding: 14px 16px;
    font-size: 17px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    background: var(--background);
    color: var(--text-primary);
    transition: var(--transition);
    -webkit-appearance: none;
    appearance: none;
}

.input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 4px rgba(0, 122, 255, 0.1);
}

.input::placeholder {
    color: var(--text-tertiary);
}

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

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

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

.container-narrow {
    max-width: 600px;
    margin: 0 auto;
    padding: var(--spacing-lg);
}

/* Header */
.header {
    background: var(--background);
    border-bottom: 1px solid var(--border-color);
    padding: var(--spacing-md) var(--spacing-lg);
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: saturate(180%) blur(20px);
    background: rgba(255, 255, 255, 0.8);
}

/* Logo Container */
.logo-container {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.logo {
    height: 60px;
    max-width: 280px;
    object-fit: contain;
    opacity: 0.9;
    transition: opacity 0.3s;
}

.logo:hover {
    opacity: 1;
}

.logo-large {
    height: 80px;
    max-width: 350px;
}

.logo-hero {
    height: 100px;
    max-width: 400px;
}

/* Status Badges */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 6px 12px;
    border-radius: 20px;
    font-size: 13px;
    font-weight: 500;
    background: var(--background-secondary);
    color: var(--text-secondary);
}

.badge-success {
    background: #D1F2EB;
    color: #0D7377;
}

.badge-warning {
    background: #FFF3CD;
    color: #856404;
}

.badge-info {
    background: #D1ECF1;
    color: #0C5460;
}

.badge-primary {
    background: #E3F2FD;
    color: #1976D2;
}

/* Loading Spinner */
.spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--background-secondary);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin: 0 auto;
}

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

/* Error/Success Messages */
.alert {
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    font-size: 15px;
    margin-bottom: var(--spacing-md);
}

.alert-error {
    background: #FEE;
    color: #C33;
    border: 1px solid #FCC;
}

.alert-success {
    background: #D1F2EB;
    color: #0D7377;
    border: 1px solid #A8E6CF;
}

.alert-info {
    background: #E3F2FD;
    color: #1976D2;
    border: 1px solid #BBDEFB;
}

/* Grid Layouts */
.grid {
    display: grid;
    gap: var(--spacing-md);
}

.grid-2 {
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

.grid-3 {
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
}

/* Timeline - Apple Style */
.timeline {
    position: relative;
    padding: var(--spacing-xl) 0;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 20px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--border-color);
}

.timeline-step {
    position: relative;
    padding-left: 60px;
    margin-bottom: var(--spacing-lg);
}

.timeline-step::before {
    content: '';
    position: absolute;
    left: 11px;
    top: 0;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--background-secondary);
    border: 2px solid var(--border-color);
    z-index: 2;
    transition: var(--transition);
}

.timeline-step.active::before,
.timeline-step.completed::before {
    background: var(--primary-color);
    border-color: var(--primary-color);
    box-shadow: 0 0 0 4px rgba(0, 122, 255, 0.1);
}

.timeline-step.completed::before {
    background: #34C759;
    border-color: #34C759;
}

/* Utility Classes */
.text-center {
    text-align: center;
}

.text-muted {
    color: var(--text-secondary);
}

.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); }

.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); }

/* Responsive */
@media (max-width: 768px) {
    .container {
        padding: var(--spacing-md);
    }
    
    h1 {
        font-size: 32px;
    }
    
    h2 {
        font-size: 24px;
    }
    
    .grid-2,
    .grid-3 {
        grid-template-columns: 1fr;
    }
}