/* ==========================================
   LIVREI - READING TIME CALCULATOR STYLES
   ========================================== */

/* CSS Custom Properties for Color Palette */
:root {
    --primary-gold: #D4AC0D;
    --secondary-olive: #8D8741;
    --accent-blue: #659DBD;
    --warm-brown: #DAAD86;
    --light-cream: #FBEEC1;
    
    /* Gradient Variations */
    --gradient-primary: linear-gradient(135deg, var(--primary-gold), var(--secondary-olive));
    --gradient-secondary: linear-gradient(135deg, var(--accent-blue), var(--warm-brown));
    --gradient-accent: linear-gradient(135deg, var(--warm-brown), var(--light-cream));
    --gradient-info: linear-gradient(135deg, var(--accent-blue), var(--primary-gold));
    
    /* Shadow Variables */
    --shadow-light: 0 2px 10px rgba(0, 0, 0, 0.1);
    --shadow-medium: 0 4px 20px rgba(0, 0, 0, 0.15);
    --shadow-heavy: 0 8px 30px rgba(0, 0, 0, 0.2);
    
    /* Border Radius */
    --border-radius-sm: 0.5rem;
    --border-radius-md: 1rem;
    --border-radius-lg: 1.5rem;
    --border-radius-xl: 2rem;
}

/* ==========================================
   GLOBAL STYLES
   ========================================== */

* {
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #333;
    background: linear-gradient(135deg, var(--light-cream) 0%, #ffffff 100%);
    min-height: 100vh;
}

/* Smooth scrolling */
html {
    scroll-behavior: smooth;
}

/* ==========================================
   HEADER STYLES
   ========================================== */

.header-gradient {
    background: var(--gradient-primary);
    position: relative;
    overflow: hidden;
}

.header-gradient::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grain" width="100" height="100" patternUnits="userSpaceOnUse"><circle cx="50" cy="50" r="0.5" fill="white" opacity="0.1"/></pattern></defs><rect width="100" height="100" fill="url(%23grain)"/></svg>');
    pointer-events: none;
}

.header-gradient h1 {
    font-weight: 700;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
}

.header-gradient .lead {
    font-size: 1.1rem;
    text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.2);
}

/* ==========================================
   CARD STYLES
   ========================================== */

.card {
    border: none;
    box-shadow: var(--shadow-light);
    transition: all 0.3s ease;
    overflow: hidden;
}

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

.card-header.bg-gradient-primary {
    background: var(--gradient-primary) !important;
    border-bottom: none;
}

.card-header.bg-gradient-info {
    background: var(--gradient-info) !important;
    border-bottom: none;
}

.card-header.bg-light {
    background: var(--light-cream) !important;
    border-bottom: 1px solid rgba(0, 0, 0, 0.1);
}

/* Result Cards */
.result-card {
    transition: all 0.3s ease;
    background: linear-gradient(135deg, #ffffff 0%, var(--light-cream) 100%);
}

.result-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-heavy);
}

.result-icon {
    transition: transform 0.3s ease;
}

.result-card:hover .result-icon {
    transform: scale(1.1);
}

.result-value {
    font-family: 'Courier New', monospace;
}

/* ==========================================
   FORM STYLES
   ========================================== */

.form-control {
    border: 2px solid #e9ecef;
    border-radius: var(--border-radius-sm);
    transition: all 0.3s ease;
    font-size: 1rem;
}

.form-control:focus {
    border-color: var(--primary-gold);
    box-shadow: 0 0 0 0.2rem rgba(212, 172, 13, 0.25);
}

.form-control-lg {
    padding: 0.75rem 1rem;
    font-size: 1.1rem;
}

.input-group-text {
    border: 2px solid #e9ecef;
    border-right: none;
    background: var(--light-cream);
    color: var(--secondary-olive);
    font-weight: 600;
}

.form-control:focus + .input-group-text,
.input-group-text + .form-control:focus {
    border-color: var(--primary-gold);
}

.form-label {
    color: var(--secondary-olive);
    margin-bottom: 0.75rem;
    font-size: 1rem;
}

.form-text {
    margin-top: 0.5rem;
    color: var(--accent-blue);
}

/* Radio Button Group */
.btn-group .btn-outline-primary {
    border-color: var(--primary-gold);
    color: var(--primary-gold);
    transition: all 0.3s ease;
}

.btn-group .btn-outline-primary:hover,
.btn-group .btn-outline-primary.active {
    background: var(--gradient-primary);
    border-color: var(--primary-gold);
    color: white;
}

.btn-check:checked + .btn-outline-primary {
    background: var(--gradient-primary);
    border-color: var(--primary-gold);
    color: white;
}

/* ==========================================
   BUTTON STYLES
   ========================================== */

.btn {
    border-radius: var(--border-radius-sm);
    font-weight: 600;
    transition: all 0.3s ease;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    font-size: 0.9rem;
}

.btn-primary {
    background: var(--gradient-primary);
    border: none;
    color: white;
}

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

.btn-outline-secondary {
    border-color: var(--warm-brown);
    color: var(--warm-brown);
}

.btn-outline-secondary:hover {
    background: var(--warm-brown);
    border-color: var(--warm-brown);
    color: white;
}

.btn-lg {
    padding: 0.75rem 2rem;
    font-size: 1rem;
}

/* ==========================================
   ALERT STYLES
   ========================================== */

.alert-success {
    background: linear-gradient(135deg, #d4edda 0%, var(--light-cream) 100%);
    border: 1px solid var(--primary-gold);
    color: var(--secondary-olive);
}

.alert-success .fa-check-circle {
    color: #28a745;
}

/* ==========================================
   SUMMARY STYLES
   ========================================== */

.summary-item {
    transition: all 0.3s ease;
    border: 1px solid transparent;
}

.summary-item:hover {
    background: var(--light-cream) !important;
    border-color: var(--primary-gold);
    transform: translateY(-2px);
}

/* ==========================================
   TIPS SECTION
   ========================================== */

.tip-item {
    transition: all 0.3s ease;
    border-radius: var(--border-radius-md);
}

.tip-item:hover {
    background: var(--light-cream) !important;
    transform: translateY(-3px);
}

.tip-item i {
    transition: transform 0.3s ease;
}

.tip-item:hover i {
    transform: scale(1.2);
}

/* ==========================================
   FOOTER STYLES
   ========================================== */

.footer-gradient {
    background: var(--gradient-primary);
    position: relative;
    margin-top: auto;
}

.footer-gradient::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.1);
    pointer-events: none;
}

.footer-gradient a:hover {
    text-decoration: underline !important;
    color: var(--light-cream) !important;
}

/* ==========================================
   UTILITY CLASSES
   ========================================== */

.bg-gradient-primary {
    background: var(--gradient-primary) !important;
}

.bg-gradient-secondary {
    background: var(--gradient-secondary) !important;
}

.bg-gradient-info {
    background: var(--gradient-info) !important;
}

.text-primary {
    color: var(--primary-gold) !important;
}

.text-secondary {
    color: var(--secondary-olive) !important;
}

.rounded-4 {
    border-radius: var(--border-radius-lg) !important;
}

/* ==========================================
   ANIMATIONS
   ========================================== */

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes pulse {
    0% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.05);
    }
    100% {
        transform: scale(1);
    }
}

.fade-in-up {
    animation: fadeInUp 0.6s ease-out;
}

.pulse-animation {
    animation: pulse 2s infinite;
}

/* ==========================================
   RESPONSIVE DESIGN
   ========================================== */

/* Tablet Styles */
@media (max-width: 768px) {
    .header-gradient h1 {
        font-size: 2.5rem;
    }
    
    .header-gradient .lead {
        font-size: 1rem;
    }
    
    .display-4 {
        font-size: 2.5rem;
    }
    
    .btn-lg {
        padding: 0.6rem 1.5rem;
        font-size: 0.95rem;
    }
    
    .card-body {
        padding: 1.5rem !important;
    }
    
    .result-icon i {
        font-size: 2rem !important;
    }
}

/* Mobile Styles */
@media (max-width: 576px) {
    .container {
        padding: 0 15px;
    }
    
    .header-gradient {
        padding: 2rem 0 !important;
    }
    
    .header-gradient h1 {
        font-size: 2rem;
        text-align: center;
    }
    
    .header-gradient .lead {
        text-align: center;
        font-size: 0.9rem;
    }
    
    .header-gradient .col-md-4 {
        text-align: center !important;
        margin-top: 1rem;
    }
    
    .display-4 {
        font-size: 2rem;
    }
    
    .btn-group {
        display: flex;
        flex-direction: column;
    }
    
    .btn-group .btn {
        border-radius: var(--border-radius-sm) !important;
        margin-bottom: 0.5rem;
    }
    
    .btn-group .btn:last-child {
        margin-bottom: 0;
    }
    
    .d-grid.gap-2.d-md-flex {
        gap: 0.5rem !important;
    }
    
    .card-body {
        padding: 1rem !important;
    }
    
    .tip-item {
        margin-bottom: 1rem;
    }
    
    .footer-gradient .col-md-6:last-child {
        text-align: center !important;
        margin-top: 1rem;
    }
}

/* ==========================================
   ACCESSIBILITY IMPROVEMENTS
   ========================================== */

/* Focus indicators */
.btn:focus,
.form-control:focus,
.btn-check:focus + .btn {
    outline: 2px solid var(--primary-gold);
    outline-offset: 2px;
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    :root {
        --primary-gold: #B8860B;
        --secondary-olive: #6B6B2F;
        --accent-blue: #4682B4;
    }
    
    .card {
        border: 2px solid #333;
    }
    
    .form-control {
        border-width: 3px;
    }
}

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Print styles */
@media print {
    .header-gradient,
    .footer-gradient,
    .btn,
    .alert {
        background: white !important;
        color: black !important;
        box-shadow: none !important;
    }
    
    .card {
        border: 1px solid #333 !important;
        box-shadow: none !important;
    }
    
    .d-none {
        display: block !important;
    }
}

/* ==========================================
   LOADING STATES
   ========================================== */

.loading {
    opacity: 0.6;
    pointer-events: none;
    position: relative;
}

.loading::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 20px;
    height: 20px;
    margin: -10px 0 0 -10px;
    border: 2px solid var(--primary-gold);
    border-top: 2px solid transparent;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* ==========================================
   ERROR STATES
   ========================================== */

.is-invalid {
    border-color: #dc3545 !important;
}

.invalid-feedback {
    display: block;
    color: #dc3545;
    font-size: 0.875rem;
    margin-top: 0.25rem;
}

.form-control.is-invalid:focus {
    border-color: #dc3545;
    box-shadow: 0 0 0 0.2rem rgba(220, 53, 69, 0.25);
}