/**
 * LinkedIn Hashtag Generator - Frontend Styles
 * 
 * Modern, LinkedIn-inspired design with soft blue accents,
 * rounded cards, and professional typography.
 */

/* =========================================
   CSS Custom Properties (Design Tokens)
   ========================================= */
:root {
    /* LinkedIn-inspired colors */
    --lhg-primary: #0077B5;
    --lhg-primary-dark: #005885;
    --lhg-primary-light: #00A0DC;
    --lhg-primary-subtle: #E8F4F8;
    
    /* Neutral colors */
    --lhg-white: #FFFFFF;
    --lhg-gray-50: #F8FAFC;
    --lhg-gray-100: #F3F6F8;
    --lhg-gray-200: #E1E9EE;
    --lhg-gray-300: #CCD6DD;
    --lhg-gray-400: #9AAAB4;
    --lhg-gray-500: #6B7C87;
    --lhg-gray-600: #4A5568;
    --lhg-gray-700: #2D3748;
    --lhg-gray-800: #1A202C;
    
    /* Semantic colors */
    --lhg-success: #057642;
    --lhg-success-bg: #E6F4ED;
    --lhg-warning: #915907;
    --lhg-warning-bg: #FEF3E6;
    --lhg-error: #CC1016;
    --lhg-error-bg: #FCEAE9;
    
    /* Typography */
    --lhg-font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --lhg-font-size-xs: 0.75rem;
    --lhg-font-size-sm: 0.875rem;
    --lhg-font-size-base: 1rem;
    --lhg-font-size-lg: 1.125rem;
    --lhg-font-size-xl: 1.25rem;
    --lhg-font-size-2xl: 1.5rem;
    --lhg-font-size-3xl: 1.875rem;
    
    /* Spacing */
    --lhg-space-1: 0.25rem;
    --lhg-space-2: 0.5rem;
    --lhg-space-3: 0.75rem;
    --lhg-space-4: 1rem;
    --lhg-space-5: 1.25rem;
    --lhg-space-6: 1.5rem;
    --lhg-space-8: 2rem;
    --lhg-space-10: 2.5rem;
    --lhg-space-12: 3rem;
    
    /* Border radius */
    --lhg-radius-sm: 0.375rem;
    --lhg-radius-md: 0.5rem;
    --lhg-radius-lg: 0.75rem;
    --lhg-radius-xl: 1rem;
    --lhg-radius-full: 9999px;
    
    /* Shadows */
    --lhg-shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --lhg-shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --lhg-shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --lhg-shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    
    /* Transitions */
    --lhg-transition-fast: 150ms ease;
    --lhg-transition-base: 200ms ease;
    --lhg-transition-slow: 300ms ease;
}

/* =========================================
   Base Container
   ========================================= */
.lhg-container {
    max-width: 720px;
    margin: 0 auto;
    padding: var(--lhg-space-6);
    font-family: var(--lhg-font-family);
    color: var(--lhg-gray-700);
    line-height: 1.6;
}

.lhg-container *,
.lhg-container *::before,
.lhg-container *::after {
    box-sizing: border-box;
}

/* =========================================
   Header
   ========================================= */
.lhg-header {
    text-align: center;
    margin-bottom: var(--lhg-space-8);
    padding-bottom: var(--lhg-space-6);
    border-bottom: 1px solid var(--lhg-gray-200);
}

.lhg-logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--lhg-space-3);
    margin-bottom: var(--lhg-space-3);
}

.lhg-icon {
    width: 40px;
    height: 40px;
    color: var(--lhg-primary);
}

.lhg-title {
    font-size: var(--lhg-font-size-2xl);
    font-weight: 700;
    color: var(--lhg-gray-800);
    margin: 0;
    letter-spacing: -0.025em;
}

.lhg-tagline {
    font-size: var(--lhg-font-size-base);
    color: var(--lhg-gray-500);
    margin: 0;
}

/* =========================================
   Cards
   ========================================= */
.lhg-card {
    background: var(--lhg-white);
    border-radius: var(--lhg-radius-xl);
    padding: var(--lhg-space-6);
    margin-bottom: var(--lhg-space-6);
    box-shadow: var(--lhg-shadow-md);
    border: 1px solid var(--lhg-gray-200);
}

.lhg-card-title {
    display: flex;
    align-items: center;
    gap: var(--lhg-space-3);
    font-size: var(--lhg-font-size-lg);
    font-weight: 600;
    color: var(--lhg-gray-800);
    margin: 0 0 var(--lhg-space-5) 0;
}

.lhg-step {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    background: var(--lhg-primary);
    color: var(--lhg-white);
    font-size: var(--lhg-font-size-sm);
    font-weight: 600;
    border-radius: var(--lhg-radius-full);
    flex-shrink: 0;
}

/* =========================================
   Form Elements
   ========================================= */
.lhg-form-group {
    margin-bottom: var(--lhg-space-5);
}

.lhg-form-group:last-child {
    margin-bottom: 0;
}

.lhg-label {
    display: block;
    font-size: var(--lhg-font-size-sm);
    font-weight: 600;
    color: var(--lhg-gray-700);
    margin-bottom: var(--lhg-space-2);
}

.lhg-textarea,
.lhg-select {
    width: 100%;
    padding: var(--lhg-space-3) var(--lhg-space-4);
    font-size: var(--lhg-font-size-base);
    font-family: var(--lhg-font-family);
    color: var(--lhg-gray-700);
    background: var(--lhg-gray-50);
    border: 2px solid var(--lhg-gray-200);
    border-radius: var(--lhg-radius-lg);
    transition: border-color var(--lhg-transition-fast), box-shadow var(--lhg-transition-fast);
    outline: none;
}

.lhg-textarea:focus,
.lhg-select:focus {
    border-color: var(--lhg-primary);
    box-shadow: 0 0 0 3px var(--lhg-primary-subtle);
    background: var(--lhg-white);
}

.lhg-textarea {
    resize: vertical;
    min-height: 120px;
}

.lhg-textarea::placeholder {
    color: var(--lhg-gray-400);
}

.lhg-select {
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='%236B7C87'%3E%3Cpath d='M7 10l5 5 5-5z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right var(--lhg-space-3) center;
    background-size: 24px;
    padding-right: var(--lhg-space-10);
    cursor: pointer;
}

.lhg-char-count {
    display: block;
    text-align: right;
    font-size: var(--lhg-font-size-xs);
    color: var(--lhg-gray-400);
    margin-top: var(--lhg-space-1);
}

/* Options Grid */
.lhg-options-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--lhg-space-4);
}

@media (max-width: 600px) {
    .lhg-options-grid {
        grid-template-columns: 1fr;
    }
}

/* =========================================
   Slider
   ========================================= */
.lhg-slider-group .lhg-label {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.lhg-count-value {
    background: var(--lhg-primary-subtle);
    color: var(--lhg-primary);
    padding: var(--lhg-space-1) var(--lhg-space-3);
    border-radius: var(--lhg-radius-full);
    font-weight: 700;
}

.lhg-slider {
    width: 100%;
    height: 8px;
    background: var(--lhg-gray-200);
    border-radius: var(--lhg-radius-full);
    appearance: none;
    cursor: pointer;
}

.lhg-slider::-webkit-slider-thumb {
    appearance: none;
    width: 24px;
    height: 24px;
    background: var(--lhg-primary);
    border-radius: var(--lhg-radius-full);
    cursor: pointer;
    box-shadow: var(--lhg-shadow-md);
    transition: transform var(--lhg-transition-fast);
}

.lhg-slider::-webkit-slider-thumb:hover {
    transform: scale(1.1);
}

.lhg-slider::-moz-range-thumb {
    width: 24px;
    height: 24px;
    background: var(--lhg-primary);
    border-radius: var(--lhg-radius-full);
    cursor: pointer;
    border: none;
    box-shadow: var(--lhg-shadow-md);
}

.lhg-slider-labels {
    display: flex;
    justify-content: space-between;
    font-size: var(--lhg-font-size-xs);
    color: var(--lhg-gray-400);
    margin-top: var(--lhg-space-2);
}

/* =========================================
   Toggle Buttons
   ========================================= */
.lhg-toggle-group {
    display: flex;
    gap: var(--lhg-space-3);
    flex-wrap: wrap;
}

.lhg-toggle {
    display: inline-flex;
    align-items: center;
    gap: var(--lhg-space-2);
    padding: var(--lhg-space-3) var(--lhg-space-4);
    font-size: var(--lhg-font-size-sm);
    font-weight: 500;
    font-family: var(--lhg-font-family);
    color: var(--lhg-gray-600);
    background: var(--lhg-gray-100);
    border: 2px solid transparent;
    border-radius: var(--lhg-radius-lg);
    cursor: pointer;
    transition: all var(--lhg-transition-fast);
}

.lhg-toggle:hover {
    background: var(--lhg-gray-200);
}

.lhg-toggle--active {
    background: var(--lhg-primary-subtle);
    color: var(--lhg-primary);
    border-color: var(--lhg-primary);
}

.lhg-toggle-icon {
    width: 18px;
    height: 18px;
}

/* =========================================
   Buttons
   ========================================= */
.lhg-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--lhg-space-2);
    padding: var(--lhg-space-3) var(--lhg-space-6);
    font-size: var(--lhg-font-size-base);
    font-weight: 600;
    font-family: var(--lhg-font-family);
    border-radius: var(--lhg-radius-full);
    cursor: pointer;
    transition: all var(--lhg-transition-fast);
    border: 2px solid transparent;
}

.lhg-button-icon {
    width: 20px;
    height: 20px;
}

.lhg-button--primary {
    width: 100%;
    padding: var(--lhg-space-4) var(--lhg-space-6);
    background: var(--lhg-primary);
    color: var(--lhg-white);
    font-size: var(--lhg-font-size-lg);
    margin-top: var(--lhg-space-4);
}

.lhg-button--primary:hover {
    background: var(--lhg-primary-dark);
    transform: translateY(-1px);
    box-shadow: var(--lhg-shadow-lg);
}

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

.lhg-button--primary:disabled {
    background: var(--lhg-gray-300);
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

.lhg-button--secondary {
    background: var(--lhg-primary);
    color: var(--lhg-white);
}

.lhg-button--secondary:hover {
    background: var(--lhg-primary-dark);
}

.lhg-button--outline {
    background: transparent;
    color: var(--lhg-primary);
    border-color: var(--lhg-primary);
}

.lhg-button--outline:hover {
    background: var(--lhg-primary-subtle);
}

/* =========================================
   Results Section
   ========================================= */
.lhg-results-card {
    background: linear-gradient(135deg, var(--lhg-white) 0%, var(--lhg-gray-50) 100%);
}

.lhg-results-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    flex-wrap: wrap;
    gap: var(--lhg-space-4);
    margin-bottom: var(--lhg-space-6);
}

.lhg-results-header .lhg-card-title {
    margin-bottom: 0;
}

.lhg-results-actions {
    display: flex;
    gap: var(--lhg-space-3);
    flex-wrap: wrap;
}

/* Hashtag Groups */
.lhg-hashtag-groups {
    display: flex;
    flex-direction: column;
    gap: var(--lhg-space-5);
}

.lhg-hashtag-group {
    background: var(--lhg-white);
    border-radius: var(--lhg-radius-lg);
    padding: var(--lhg-space-4);
    border: 1px solid var(--lhg-gray-200);
}

.lhg-group-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--lhg-space-3);
}

.lhg-group-badge {
    display: inline-flex;
    align-items: center;
    padding: var(--lhg-space-1) var(--lhg-space-3);
    font-size: var(--lhg-font-size-xs);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    border-radius: var(--lhg-radius-full);
}

.lhg-group-badge--high {
    background: var(--lhg-success-bg);
    color: var(--lhg-success);
}

.lhg-group-badge--medium {
    background: var(--lhg-warning-bg);
    color: var(--lhg-warning);
}

.lhg-group-badge--niche {
    background: var(--lhg-primary-subtle);
    color: var(--lhg-primary);
}

.lhg-group-count {
    font-size: var(--lhg-font-size-sm);
    color: var(--lhg-gray-400);
}

/* Individual Hashtags */
.lhg-hashtags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--lhg-space-2);
}

.lhg-hashtag {
    display: inline-flex;
    align-items: center;
    padding: var(--lhg-space-2) var(--lhg-space-3);
    font-size: var(--lhg-font-size-sm);
    font-weight: 500;
    color: var(--lhg-primary);
    background: var(--lhg-primary-subtle);
    border-radius: var(--lhg-radius-md);
    cursor: pointer;
    transition: all var(--lhg-transition-fast);
    border: none;
    font-family: var(--lhg-font-family);
}

.lhg-hashtag:hover {
    background: var(--lhg-primary);
    color: var(--lhg-white);
    transform: translateY(-1px);
}

.lhg-hashtag--copied {
    background: var(--lhg-success);
    color: var(--lhg-white);
}

/* Total Count */
.lhg-total-count {
    text-align: center;
    padding-top: var(--lhg-space-5);
    margin-top: var(--lhg-space-5);
    border-top: 1px solid var(--lhg-gray-200);
    font-size: var(--lhg-font-size-sm);
    color: var(--lhg-gray-500);
}

.lhg-total-count span {
    font-weight: 700;
    color: var(--lhg-primary);
}

/* =========================================
   Footer
   ========================================= */
.lhg-footer {
    text-align: center;
    padding: var(--lhg-space-4);
}

.lhg-disclaimer {
    font-size: var(--lhg-font-size-xs);
    color: var(--lhg-gray-400);
    margin: 0 0 var(--lhg-space-3) 0;
}

.lhg-tip {
    font-size: var(--lhg-font-size-sm);
    color: var(--lhg-gray-500);
    background: var(--lhg-gray-100);
    padding: var(--lhg-space-3) var(--lhg-space-4);
    border-radius: var(--lhg-radius-lg);
    margin: 0;
}

.lhg-tip strong {
    color: var(--lhg-primary);
}

/* =========================================
   Toast Notification
   ========================================= */
.lhg-toast {
    position: fixed;
    bottom: var(--lhg-space-6);
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    padding: var(--lhg-space-3) var(--lhg-space-6);
    background: var(--lhg-gray-800);
    color: var(--lhg-white);
    font-size: var(--lhg-font-size-sm);
    font-weight: 500;
    border-radius: var(--lhg-radius-full);
    box-shadow: var(--lhg-shadow-xl);
    opacity: 0;
    visibility: hidden;
    transition: all var(--lhg-transition-slow);
    z-index: 9999;
}

.lhg-toast--visible {
    transform: translateX(-50%) translateY(0);
    opacity: 1;
    visibility: visible;
}

.lhg-toast--success {
    background: var(--lhg-success);
}

.lhg-toast--error {
    background: var(--lhg-error);
}

/* =========================================
   Loading State
   ========================================= */
.lhg-button--loading {
    pointer-events: none;
    opacity: 0.8;
}

.lhg-button--loading .lhg-button-icon {
    animation: lhg-spin 1s linear infinite;
}

@keyframes lhg-spin {
    from {
        transform: rotate(0deg);
    }
    to {
        transform: rotate(360deg);
    }
}

/* =========================================
   Responsive Adjustments
   ========================================= */
@media (max-width: 600px) {
    .lhg-container {
        padding: var(--lhg-space-4);
    }
    
    .lhg-card {
        padding: var(--lhg-space-4);
    }
    
    .lhg-title {
        font-size: var(--lhg-font-size-xl);
    }
    
    .lhg-logo {
        flex-direction: column;
        gap: var(--lhg-space-2);
    }
    
    .lhg-results-header {
        flex-direction: column;
        align-items: stretch;
    }
    
    .lhg-results-actions {
        justify-content: center;
    }
    
    .lhg-toggle-group {
        justify-content: center;
    }
}

/* =========================================
   Print Styles
   ========================================= */
@media print {
    .lhg-container {
        max-width: 100%;
        padding: 0;
    }
    
    .lhg-card {
        box-shadow: none;
        border: 1px solid #ccc;
    }
    
    .lhg-button,
    .lhg-toast {
        display: none;
    }
}