/* ========================================
   ABADEL - Mediterranean Editorial Theme
   ======================================== */

/* Google Fonts Import */
@import url('https://fonts.googleapis.com/css2?family=Playfair+Display:wght@400;600;700;800&family=Inter:wght@300;400;500;600;700&family=Italiana&display=swap');

/* ========================================
   CSS VARIABLES - Design System
   ======================================== */
:root {
    /* Colors - Mediterranean Palette */
    --color-terracotta: #D4734B;
    --color-terracotta-dark: #C85A3C;
    --color-terracotta-light: #E89977;
    --color-blue-deep: #2B5F82;
    --color-blue-darker: #1A3A52;
    --color-blue-light: #4A7FA0;
    --color-olive: #8B9556;
    --color-olive-dark: #6F7844;
    --color-cream: #F8F5F0;
    --color-cream-dark: #E6E0D8;
    --color-charcoal: #3A3A3A;
    --color-white: #FFFFFF;
    --color-beige: #D9CFC1;

    /* Typography */
    --font-display: 'Playfair Display', Georgia, serif;
    --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-italian: 'Italiana', serif;

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2.5rem;
    --spacing-xl: 4rem;

    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(59, 59, 59, 0.08);
    --shadow-md: 0 4px 16px rgba(59, 59, 59, 0.12);
    --shadow-lg: 0 8px 32px rgba(59, 59, 59, 0.16);
    --shadow-hover: 0 12px 40px rgba(59, 59, 59, 0.2);

    /* Border Radius */
    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 20px;

    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-base: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ========================================
   GLOBAL STYLES
   ======================================== */
* {
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-body);
    background-color: var(--color-cream);
    background-image:
        radial-gradient(circle at 20% 50%, rgba(212, 115, 75, 0.03) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(43, 95, 130, 0.03) 0%, transparent 50%);
    background-attachment: fixed;
    color: var(--color-charcoal);
    line-height: 1.6;
    overflow-x: hidden;
}

/* Subtle paper texture */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: url("data:image/svg+xml,%3Csvg width='100' height='100' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' /%3E%3CfeColorMatrix type='saturate' values='0'/%3E%3C/filter%3E%3Crect width='100' height='100' filter='url(%23noise)' opacity='0.03'/%3E%3C/svg%3E");
    pointer-events: none;
    z-index: 1;
}

body > *:not(.modal):not(.modal-backdrop) {
    position: relative;
    z-index: 2;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-display);
    font-weight: 700;
    line-height: 1.2;
    color: var(--color-blue-darker);
    margin-bottom: var(--spacing-md);
}

h1 {
    font-size: clamp(2rem, 5vw, 3.5rem);
    font-weight: 800;
    letter-spacing: -0.02em;
}

h2 {
    font-size: clamp(1.75rem, 4vw, 2.75rem);
}

h3 {
    font-size: clamp(1.5rem, 3vw, 2.25rem);
}

h4 {
    font-size: clamp(1.25rem, 2.5vw, 1.75rem);
}

h5 {
    font-size: clamp(1.1rem, 2vw, 1.5rem);
}

/* Italian text emphasis */
.italian-text {
    font-family: var(--font-italian);
    color: var(--color-terracotta-dark);
    font-size: 1.1em;
}

/* ========================================
   NAVIGATION
   ======================================== */
.navbar {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(43, 95, 130, 0.1);
    box-shadow: var(--shadow-sm);
    padding: var(--spacing-sm) 0;
    transition: var(--transition-base);
}

.navbar-brand {
    font-family: var(--font-display);
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--color-blue-darker) !important;
    letter-spacing: -0.02em;
    transition: var(--transition-base);
}

.navbar-brand:hover {
    color: var(--color-terracotta) !important;
    transform: translateY(-1px);
}

.nav-link {
    font-weight: 500;
    color: var(--color-charcoal) !important;
    padding: 0.5rem 1rem !important;
    border-radius: var(--radius-sm);
    transition: var(--transition-base);
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 2px;
    background: var(--color-terracotta);
    transition: var(--transition-base);
    transform: translateX(-50%);
}

.nav-link:hover {
    color: var(--color-terracotta) !important;
    background: rgba(212, 115, 75, 0.05);
}

.nav-link:hover::after,
.nav-link.active::after {
    width: 80%;
}

.nav-link.active {
    color: var(--color-terracotta) !important;
    font-weight: 600;
}

/* ========================================
   BUTTONS
   ======================================== */
.btn {
    font-family: var(--font-body);
    font-weight: 600;
    padding: 0.75rem 1.75rem;
    border-radius: var(--radius-md);
    border: none;
    transition: all var(--transition-base);
    text-transform: none;
    letter-spacing: 0.01em;
    box-shadow: var(--shadow-sm);
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.2);
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

.btn:hover::before {
    width: 300px;
    height: 300px;
}

.btn-primary {
    background: linear-gradient(135deg, var(--color-terracotta) 0%, var(--color-terracotta-dark) 100%);
    color: var(--color-white);
}

.btn-primary:hover {
    background: linear-gradient(135deg, var(--color-terracotta-dark) 0%, var(--color-terracotta) 100%);
    transform: translateY(-2px);
    box-shadow: var(--shadow-hover);
}

.btn-primary:active,
.btn-primary:focus {
    background: var(--color-terracotta-dark);
    box-shadow: var(--shadow-md);
    outline: none;
}

.btn-secondary {
    background: var(--color-blue-deep);
    color: var(--color-white);
}

.btn-secondary:hover {
    background: var(--color-blue-darker);
    transform: translateY(-2px);
    box-shadow: var(--shadow-hover);
}

.btn-info {
    background: var(--color-olive);
    color: var(--color-white);
}

.btn-info:hover,
.btn-info.activeBtn,
.btn-info:focus {
    background: var(--color-olive-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-hover);
}

.btn-light {
    background: var(--color-white);
    color: var(--color-charcoal);
    border: 2px solid var(--color-cream-dark);
}

.btn-light:hover {
    background: var(--color-cream);
    border-color: var(--color-terracotta);
    color: var(--color-terracotta);
}

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

/* Icon buttons */
.btn-icon {
    width: 48px;
    height: 48px;
    padding: 0;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
}

/* ========================================
   CARDS & CONTAINERS
   ======================================== */
.card {
    background: var(--color-white);
    border: none;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    overflow: hidden;
    transition: var(--transition-base);
    animation: fadeInUp 0.6s ease backwards;
}

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

.card-header {
    background: linear-gradient(135deg, var(--color-blue-deep) 0%, var(--color-blue-darker) 100%);
    color: var(--color-white);
    border: none;
    padding: var(--spacing-md);
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 1.5rem;
}

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

/* Content containers */
.content-section {
    background: var(--color-white);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    box-shadow: var(--shadow-md);
    animation: fadeInUp 0.6s ease backwards;
}

/* ========================================
   FORMS
   ======================================== */
.form-control,
.form-select {
    font-family: var(--font-body);
    border: 2px solid var(--color-cream-dark);
    border-radius: var(--radius-md);
    padding: 0.75rem 1rem;
    transition: var(--transition-base);
    background: var(--color-white);
    color: var(--color-charcoal);
}

.form-control:focus,
.form-select:focus {
    border-color: var(--color-terracotta);
    box-shadow: 0 0 0 0.2rem rgba(212, 115, 75, 0.15);
    outline: none;
}

.form-label {
    font-weight: 600;
    color: var(--color-blue-darker);
    margin-bottom: var(--spacing-xs);
}

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

/* Custom checkboxes and radios */
.form-check-input {
    width: 1.25rem;
    height: 1.25rem;
    border: 2px solid var(--color-cream-dark);
    cursor: pointer;
    transition: var(--transition-base);
}

.form-check-input:checked {
    background-color: var(--color-terracotta);
    border-color: var(--color-terracotta);
}

.form-check-input:focus {
    border-color: var(--color-terracotta);
    box-shadow: 0 0 0 0.2rem rgba(212, 115, 75, 0.15);
}

.form-check-label {
    cursor: pointer;
    user-select: none;
    margin-left: 0.5rem;
}

/* ========================================
   MODALS
   ======================================== */
.modal {
    position: fixed !important;
    z-index: 1055 !important;
    pointer-events: auto !important;
}

.modal-backdrop {
    position: fixed !important;
    z-index: 1050 !important;
    pointer-events: auto !important;
}

.modal-dialog {
    pointer-events: auto !important;
    z-index: 1056;
}

.modal-content {
    border: none;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    overflow: hidden;
    position: relative;
    z-index: 1057;
    pointer-events: auto !important;
}

.modal-content * {
    pointer-events: auto !important;
}

.modal-header {
    background: linear-gradient(135deg, var(--color-blue-deep) 0%, var(--color-blue-darker) 100%);
    color: var(--color-white);
    border: none;
    padding: var(--spacing-md) var(--spacing-lg);
    pointer-events: auto;
}

.modal-title {
    font-family: var(--font-display);
    font-weight: 700;
}

.modal-body {
    padding: var(--spacing-lg);
    pointer-events: auto;
}

.modal-footer {
    border-top: 1px solid var(--color-cream-dark);
    padding: var(--spacing-md) var(--spacing-lg);
    pointer-events: auto;
}

.modal .btn-close {
    filter: brightness(0) invert(1);
}

/* ========================================
   TABS
   ======================================== */
.nav-tabs {
    border: none;
    gap: 0.5rem;
}

.nav-tabs .nav-link {
    border: 2px solid var(--color-cream-dark);
    border-radius: var(--radius-md);
    color: var(--color-charcoal);
    font-weight: 600;
    padding: 0.75rem 1.5rem;
    transition: var(--transition-base);
}

.nav-tabs .nav-link:hover {
    border-color: var(--color-terracotta-light);
    background: rgba(212, 115, 75, 0.05);
}

.nav-tabs .nav-link.active {
    background: linear-gradient(135deg, var(--color-terracotta) 0%, var(--color-terracotta-dark) 100%);
    color: var(--color-white);
    border-color: var(--color-terracotta);
}

.tab-content {
    padding: var(--spacing-lg) 0;
}

/* ========================================
   ALERTS
   ======================================== */
.alert {
    border: none;
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    border-left: 4px solid;
    animation: slideInRight 0.4s ease;
}

.alert-success {
    background: rgba(139, 149, 86, 0.1);
    border-left-color: var(--color-olive);
    color: var(--color-olive-dark);
}

.alert-danger {
    background: rgba(200, 90, 60, 0.1);
    border-left-color: var(--color-terracotta-dark);
    color: var(--color-terracotta-dark);
}

.alert-info {
    background: rgba(43, 95, 130, 0.1);
    border-left-color: var(--color-blue-deep);
    color: var(--color-blue-darker);
}

/* ========================================
   UTILITIES
   ======================================== */

/* Decorative dividers */
.divider {
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--color-terracotta), transparent);
    margin: var(--spacing-lg) 0;
    border-radius: 2px;
}

.divider-thick {
    height: 4px;
}

/* Decorative accent */
.accent-line {
    width: 60px;
    height: 4px;
    background: linear-gradient(90deg, var(--color-terracotta), var(--color-terracotta-light));
    border-radius: 2px;
    margin: var(--spacing-sm) 0;
}

/* Loading spinner */
.spinner-border {
    border-color: var(--color-terracotta);
    border-right-color: transparent;
}

/* Settings button (floating) */
.btn-settings {
    position: fixed;
    right: 2rem;
    top: 5rem;
    width: 56px;
    height: 56px;
    border-radius: 50%;
    background: var(--color-white);
    box-shadow: var(--shadow-lg);
    border: none;
    color: var(--color-terracotta);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition-base);
    z-index: 100;
}

.btn-settings:hover {
    background: var(--color-terracotta);
    color: var(--color-white);
    transform: rotate(90deg) scale(1.1);
    box-shadow: var(--shadow-hover);
}

/* Question/Answer button */
.question-btn {
    min-width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--color-blue-deep);
    color: var(--color-white);
    border: none;
    font-weight: 700;
    transition: var(--transition-base);
    margin-left: 0.5rem;
}

.question-btn:hover {
    background: var(--color-terracotta);
    transform: scale(1.1);
}

/* Italian sentences container */
.sentence-item {
    padding: var(--spacing-md);
    background: var(--color-white);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-md);
    box-shadow: var(--shadow-sm);
    transition: var(--transition-base);
    border-left: 4px solid var(--color-terracotta-light);
}

.sentence-item:hover {
    box-shadow: var(--shadow-md);
    transform: translateX(4px);
}

/* Verb quiz section */
.verb-quiz-section {
    background: linear-gradient(135deg, var(--color-blue-deep) 0%, var(--color-blue-darker) 100%);
    color: var(--color-white);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-lg);
}

.verb-quiz-section h4 {
    color: var(--color-white);
}

.quiz-answer {
    font-family: var(--font-italian);
    font-size: 1.5rem;
    color: var(--color-terracotta-light);
    font-weight: 600;
}

/* Exercise activity buttons */
.activity-btn {
    margin: 0.5rem;
    transition: var(--transition-base);
}

.activity-btn.activeBtn {
    background: var(--color-terracotta) !important;
    border-color: var(--color-terracotta) !important;
    transform: scale(1.05);
}

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

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(50px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

/* Staggered animations */
.stagger-animation > *:nth-child(1) { animation-delay: 0.1s; }
.stagger-animation > *:nth-child(2) { animation-delay: 0.2s; }
.stagger-animation > *:nth-child(3) { animation-delay: 0.3s; }
.stagger-animation > *:nth-child(4) { animation-delay: 0.4s; }
.stagger-animation > *:nth-child(5) { animation-delay: 0.5s; }
.stagger-animation > *:nth-child(6) { animation-delay: 0.6s; }

/* ========================================
   RESPONSIVE
   ======================================== */
@media (max-width: 768px) {
    .btn-settings {
        right: 1rem;
        top: 4.5rem;
        width: 48px;
        height: 48px;
    }

    .card-body,
    .content-section {
        padding: var(--spacing-md);
    }

    h1 {
        font-size: 2rem;
    }
}

/* ========================================
   SCROLLBAR STYLING
   ======================================== */
::-webkit-scrollbar {
    width: 12px;
    height: 12px;
}

::-webkit-scrollbar-track {
    background: var(--color-cream);
}

::-webkit-scrollbar-thumb {
    background: var(--color-terracotta-light);
    border-radius: 6px;
    border: 2px solid var(--color-cream);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--color-terracotta);
}

/* Firefox scrollbar */
* {
    scrollbar-width: thin;
    scrollbar-color: var(--color-terracotta-light) var(--color-cream);
}

/* ========================================
   STICKY FOOTER
   ======================================== */
html {
    height: 100%;
}

body {
    min-height: 100%;
    display: flex;
    flex-direction: column;
}

main {
    flex: 1 0 auto;
}

footer {
    flex-shrink: 0;
}

/* Footer lab icon */
.footer-lab-icon {
    width: 20px;
    height: 20px;
    fill: var(--color-blue-deep);
    vertical-align: middle;
    margin-right: 6px;
}