/* ============================================
   KLEARPATH - DESIGN SYSTEM
   Built with obsessive attention to detail
   ============================================ */

/* === RESET & BASE === */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Colors - Inspired by Apple's design language */
    --color-primary: #007AFF;
    --color-primary-hover: #0051D5;
    --color-accent: #FF9500;
    --color-background: #FAFAFA;
    --color-surface: #FFFFFF;
    --color-text-primary: #1D1D1F;
    --color-text-secondary: #86868B;
    --color-border: #E5E5E7;
    --color-success: #34C759;
    --color-error: #FF3B30;
    
    /* Shadows - Subtle and refined */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.12);
    
    /* Spacing - Consistent rhythm */
    --spacing-xs: 8px;
    --spacing-sm: 16px;
    --spacing-md: 24px;
    --spacing-lg: 32px;
    --spacing-xl: 48px;
    --spacing-2xl: 64px;
    
    /* Typography */
    --font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'Segoe UI', 'Roboto', 'Helvetica Neue', Arial, sans-serif;
    --font-size-xs: 13px;
    --font-size-sm: 15px;
    --font-size-base: 17px;
    --font-size-lg: 20px;
    --font-size-xl: 28px;
    --font-size-2xl: 40px;
    --font-size-3xl: 56px;
    
    /* Border radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    
    /* Transitions */
    --transition-fast: 0.15s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

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

/* === APP CONTAINER === */
.app-container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-md);
}

/* === SCREEN SYSTEM === */
.screen {
    display: none;
    width: 100%;
    max-width: 800px;
    margin: 0 auto;
    opacity: 0;
    transform: translateY(20px);
    animation: fadeInUp var(--transition-slow) forwards;
}

.screen.active {
    display: block;
}

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

.content-wrapper {
    background: var(--color-surface);
    border-radius: var(--radius-xl);
    padding: var(--spacing-2xl);
    box-shadow: var(--shadow-lg);
}

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

/* === WELCOME SCREEN === */
.logo {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--color-primary);
    margin-bottom: var(--spacing-xl);
    letter-spacing: -0.5px;
}

.hero-title {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    line-height: 1.1;
    margin-bottom: var(--spacing-md);
    letter-spacing: -1.5px;
    color: var(--color-text-primary);
}

.hero-subtitle {
    font-size: var(--font-size-lg);
    line-height: 1.5;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-xl);
    max-width: 600px;
}

.small-text {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    margin-top: var(--spacing-sm);
}

/* === BUTTONS === */
.primary-btn {
    background: var(--color-primary);
    color: white;
    border: none;
    padding: 16px 32px;
    border-radius: var(--radius-md);
    font-size: var(--font-size-base);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    box-shadow: 0 2px 8px rgba(0, 122, 255, 0.3);
    font-family: var(--font-family);
}

.primary-btn:hover {
    background: var(--color-primary-hover);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(0, 122, 255, 0.4);
}

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

.secondary-btn {
    background: transparent;
    color: var(--color-text-primary);
    border: 2px solid var(--color-border);
    padding: 14px 28px;
    border-radius: var(--radius-md);
    font-size: var(--font-size-base);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    font-family: var(--font-family);
}

.secondary-btn:hover {
    border-color: var(--color-text-primary);
    background: rgba(0, 0, 0, 0.02);
}

.icon-btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.text-btn {
    background: none;
    border: none;
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
    cursor: pointer;
    padding: var(--spacing-sm);
    transition: color var(--transition-fast);
    font-family: var(--font-family);
    margin-top: var(--spacing-lg);
}

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

.button-row {
    display: flex;
    gap: var(--spacing-sm);
    justify-content: space-between;
    margin-top: var(--spacing-xl);
}

/* === PROGRESS BAR === */
.progress-container {
    margin-bottom: var(--spacing-xl);
}

.progress-bar {
    height: 4px;
    background: var(--color-border);
    border-radius: 2px;
    overflow: hidden;
    margin-bottom: var(--spacing-sm);
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
    border-radius: 2px;
    transition: width var(--transition-base);
    width: 0%;
}

.progress-text {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    text-align: center;
}

/* === QUESTION FORM === */
.question-container {
    margin-bottom: var(--spacing-lg);
}

.question-title {
    font-size: var(--font-size-xl);
    font-weight: 700;
    line-height: 1.3;
    margin-bottom: var(--spacing-sm);
    letter-spacing: -0.5px;
}

.question-helper {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-md);
    line-height: 1.5;
}

.question-input {
    width: 100%;
    padding: var(--spacing-sm);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    font-size: var(--font-size-base);
    font-family: var(--font-family);
    line-height: 1.5;
    resize: vertical;
    transition: all var(--transition-fast);
    color: var(--color-text-primary);
}

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

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

/* === LOADING SCREEN === */
.spinner {
    width: 48px;
    height: 48px;
    border: 4px solid var(--color-border);
    border-top-color: var(--color-primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin: 0 auto var(--spacing-lg);
}

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

.loading-title {
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

.loading-subtitle {
    font-size: var(--font-size-base);
    color: var(--color-text-secondary);
}

/* === RESULTS SCREENS === */
.header-section {
    text-align: center;
    margin-bottom: var(--spacing-xl);
    padding-bottom: var(--spacing-xl);
    border-bottom: 1px solid var(--color-border);
}

.results-title {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    letter-spacing: -1px;
}

.results-subtitle {
    font-size: var(--font-size-base);
    color: var(--color-text-secondary);
}

.results-grid {
    display: grid;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
}

/* Result Cards */
.result-card {
    background: var(--color-background);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
    transition: all var(--transition-fast);
}

.result-card:hover {
    border-color: var(--color-primary);
    box-shadow: var(--shadow-sm);
}

.result-card-title {
    font-size: var(--font-size-base);
    font-weight: 600;
    color: var(--color-primary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: var(--spacing-sm);
    font-size: var(--font-size-xs);
}

.result-card-content {
    font-size: var(--font-size-base);
    color: var(--color-text-primary);
    line-height: 1.6;
}

.result-card-content h3 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    margin-top: var(--spacing-md);
}

.result-card-content h3:first-child {
    margin-top: 0;
}

.result-card-content ul {
    list-style: none;
    padding: 0;
}

.result-card-content li {
    padding: var(--spacing-xs) 0;
    padding-left: var(--spacing-md);
    position: relative;
}

.result-card-content li:before {
    content: "→";
    position: absolute;
    left: 0;
    color: var(--color-primary);
    font-weight: 600;
}

.result-card-content p {
    margin-bottom: var(--spacing-sm);
}

.result-card-content p:last-child {
    margin-bottom: 0;
}

/* Highlight Cards */
.result-card.highlight {
    background: linear-gradient(135deg, rgba(0, 122, 255, 0.05), rgba(255, 149, 0, 0.05));
    border-color: var(--color-primary);
}

/* === ACTION BAR === */
.action-bar {
    display: flex;
    gap: var(--spacing-sm);
    justify-content: center;
    flex-wrap: wrap;
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--color-border);
}

/* === ERROR SCREEN === */
.error-icon {
    font-size: 64px;
    margin-bottom: var(--spacing-md);
}

.error-title {
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--color-error);
}

.error-message {
    font-size: var(--font-size-base);
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-lg);
}

/* === RESPONSIVE DESIGN === */
@media (max-width: 768px) {
    :root {
        --font-size-3xl: 40px;
        --font-size-2xl: 32px;
        --font-size-xl: 24px;
    }
    
    .content-wrapper {
        padding: var(--spacing-lg);
    }
    
    .app-container {
        padding: var(--spacing-sm);
    }
    
    .button-row {
        flex-direction: column-reverse;
    }
    
    .button-row button {
        width: 100%;
    }
    
    .action-bar {
        flex-direction: column;
    }
    
    .action-bar button {
        width: 100%;
    }
    
    .hero-title {
        font-size: var(--font-size-2xl);
    }
}

/* === ACCESSIBILITY === */
.primary-btn:focus-visible,
.secondary-btn:focus-visible,
.text-btn:focus-visible,
.question-input:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

/* === ANIMATIONS === */
@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateX(20px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.result-card {
    animation: slideIn 0.4s ease-out backwards;
}

.result-card:nth-child(1) { animation-delay: 0.05s; }
.result-card:nth-child(2) { animation-delay: 0.1s; }
.result-card:nth-child(3) { animation-delay: 0.15s; }
.result-card:nth-child(4) { animation-delay: 0.2s; }
.result-card:nth-child(5) { animation-delay: 0.25s; }
.result-card:nth-child(6) { animation-delay: 0.3s; }
.result-card:nth-child(7) { animation-delay: 0.35s; }

/* === UTILITY CLASSES === */
.hidden {
    display: none !important;
}

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

.mb-0 { margin-bottom: 0 !important; }