:root {
    --color-primary: #0f3a60;
    --color-primary-dark: #0a2540;
    --color-cyan: #0284c7;
    --color-accent: #ea580c;
    --color-bg-soft: #f8fafc;
    --color-surface: #ffffff;
    --color-text: #0f172a;
    --color-muted: #475569;
    --color-border: #e2e8f0;
    --color-success: #10b981;
    --color-warning: #f59e0b;
    --font-family: 'Inter', system-ui, -apple-system, sans-serif;
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 1rem;
    --shadow-sm: 0 1px 2px 0 rgba(15, 58, 96, 0.05);
    --shadow-md: 0 4px 12px rgba(15, 58, 96, 0.08);
    --shadow-lg: 0 10px 25px rgba(15, 58, 96, 0.12);
    --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

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

*:focus-visible {
    outline: 2px solid var(--color-cyan);
    outline-offset: 2px;
    border-radius: 2px;
}

body {
    font-family: var(--font-family);
    background-color: var(--color-bg-soft);
    color: var(--color-text);
    line-height: 1.6;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

a {
    color: var(--color-primary);
    text-decoration: none;
    transition: var(--transition);
}

a:hover {
    color: var(--color-cyan);
}

ul {
    list-style: none;
}

img {
    max-width: 100%;
    height: auto;
}

/* Typography */
h1, h2, h3, h4 {
    color: var(--color-primary-dark);
    font-weight: 700;
    line-height: 1.2;
    letter-spacing: -0.02em;
}

h1 { font-size: clamp(2rem, 4vw, 3rem); margin-bottom: 1.5rem; }
h2 { font-size: clamp(1.5rem, 3vw, 2.25rem); margin-bottom: 1.25rem; }
h3 { font-size: clamp(1.25rem, 2vw, 1.5rem); margin-bottom: 1rem; }
h4 { font-size: 1.125rem; margin-bottom: 0.75rem; }

p { margin-bottom: 1.25rem; font-size: clamp(1rem, 1.2vw, 1.125rem); }

.text-muted { color: var(--color-muted); }
.text-center { text-align: center; }
.text-lg { font-size: clamp(1.125rem, 1.5vw, 1.25rem); }

/* Layout Containers */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

main {
    flex-grow: 1;
    padding: 4rem 0;
}

/* Header */
header {
    background-color: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: 0;
    z-index: 50;
}

.header-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 1.5rem;
    max-width: 1200px;
    margin: 0 auto;
}

.logo {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--color-primary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    letter-spacing: -0.02em;
}

.nav-menu {
    display: flex;
    gap: 2rem;
    align-items: center;
}

.nav-menu a {
    color: var(--color-muted);
    font-weight: 500;
    font-size: 0.95rem;
}

.nav-menu a:hover, .nav-menu a.active {
    color: var(--color-primary-dark);
    font-weight: 600;
}

/* Mobile Menu Toggle */
.menu-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--color-primary);
    cursor: pointer;
}

/* Footer */
footer {
    background-color: var(--color-primary-dark);
    color: var(--color-bg-soft);
    padding: 3rem 0;
    margin-top: auto;
}

.footer-inner {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    text-align: center;
}

.footer-inner p { margin-bottom: 0; font-size: 0.875rem; }

.reset-btn {
    background: none;
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: rgba(255, 255, 255, 0.7);
    padding: 0.5rem 1rem;
    font-size: 0.75rem;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: var(--transition);
    margin-top: 1rem;
}

.reset-btn:hover {
    border-color: var(--color-surface);
    color: var(--color-surface);
    background-color: rgba(255, 255, 255, 0.1);
}

/* Components - Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1.5rem;
    font-weight: 600;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition);
    border: none;
    text-align: center;
    font-size: 1rem;
    box-shadow: var(--shadow-sm);
}

.btn:active {
    transform: translateY(0) !important;
}

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

.btn-primary:hover {
    background-color: var(--color-primary-dark);
    color: var(--color-surface);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background-color: var(--color-surface);
    color: var(--color-primary);
    border: 1px solid var(--color-border);
    box-shadow: none;
}

.btn-secondary:hover {
    border-color: var(--color-primary);
    color: var(--color-primary-dark);
    transform: translateY(-1px);
    box-shadow: var(--shadow-sm);
}

.btn-accent {
    background-color: var(--color-accent);
    color: var(--color-surface);
}

.btn-accent:hover {
    background-color: #c2410c;
    color: var(--color-surface);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-disabled {
    background-color: var(--color-border);
    color: var(--color-muted);
    cursor: not-allowed;
    box-shadow: none;
}
.btn-disabled:hover { transform: none; box-shadow: none; }

/* Components - Cards */
.card {
    background-color: var(--color-surface);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    padding: 2rem;
    transition: var(--transition);
    border: 1px solid var(--color-border);
    display: flex;
    flex-direction: column;
}

.card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
    border-color: rgba(2, 132, 199, 0.2);
}

/* Components - Badges */
.badge {
    display: inline-flex;
    align-items: center;
    gap: 0.375rem;
    padding: 0.375rem 0.875rem;
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    border-radius: 9999px;
    background-color: var(--color-bg-soft);
    color: var(--color-text);
    margin-bottom: 0.75rem;
}

.badge-blue { background-color: #e0f2fe; color: #0369a1; }
.badge-green { background-color: #d1fae5; color: #047857; }
.badge-orange { background-color: #ffedd5; color: #c2410c; }
.badge-gray { background-color: #f1f5f9; color: #475569; }

/* Components - Progress Bar */
.progress-container {
    width: 100%;
    background-color: var(--color-bg-soft);
    border-radius: 9999px;
    height: 0.5rem;
    margin: 0.75rem 0;
    overflow: hidden;
    box-shadow: inset 0 1px 2px rgba(0,0,0,0.05);
}

.progress-bar {
    background-color: var(--color-success);
    height: 100%;
    border-radius: 9999px;
    transition: width 1s cubic-bezier(0.4, 0, 0.2, 1);
    background-image: linear-gradient(45deg, rgba(255,255,255,0.15) 25%, transparent 25%, transparent 50%, rgba(255,255,255,0.15) 50%, rgba(255,255,255,0.15) 75%, transparent 75%, transparent);
    background-size: 1rem 1rem;
}

/* Toast Notifications */
.toast-container {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    z-index: 100;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.toast {
    background-color: var(--color-surface);
    color: var(--color-text);
    padding: 1rem 1.5rem;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    border-left: 4px solid var(--color-primary);
    display: flex;
    align-items: center;
    gap: 0.75rem;
    transform: translateX(120%);
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    font-weight: 500;
}

.toast.show {
    transform: translateX(0);
}

.toast-success { border-left-color: var(--color-success); }
.toast-error { border-left-color: var(--color-warning); }

/* Utilities */
.grid { display: grid; gap: 2rem; }
.grid-cols-1 { grid-template-columns: repeat(1, minmax(0, 1fr)); }
.grid-cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-cols-3 { grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); }

.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-4 { gap: 1rem; }
.gap-2 { gap: 0.5rem; }
.mt-2 { margin-top: 0.5rem; }
.mt-4 { margin-top: 1rem; }
.mt-6 { margin-top: 1.5rem; }
.mt-8 { margin-top: 2rem; }
.mb-2 { margin-bottom: 0.5rem; }
.mb-4 { margin-bottom: 1rem; }
.mb-6 { margin-bottom: 1.5rem; }
.mb-8 { margin-bottom: 2rem; }
.py-8 { padding-top: 2rem; padding-bottom: 2rem; }
.py-12 { padding-top: 3rem; padding-bottom: 3rem; }
.h-full { height: 100%; }
.max-w-2xl { max-width: 42rem; }
.mx-auto { margin-left: auto; margin-right: auto; }

/* Specific Page Sections */
/* Hero */
.hero {
    background: linear-gradient(135deg, var(--color-primary-dark) 0%, var(--color-primary) 100%);
    color: var(--color-surface);
    padding: 5rem 2rem;
    text-align: center;
    border-radius: var(--radius-lg);
    margin-bottom: 4rem;
    box-shadow: var(--shadow-lg);
    position: relative;
    overflow: hidden;
}

.hero::after {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255,255,255,0.05) 0%, transparent 60%);
    pointer-events: none;
}

.hero h1 { color: var(--color-surface); margin-bottom: 1.5rem; }
.hero p { max-width: 650px; margin: 0 auto; opacity: 0.9; }

/* Method Section */
.method-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.method-step {
    background-color: var(--color-surface);
    padding: 2rem;
    border-radius: var(--radius-lg);
    text-align: center;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--color-border);
    transition: var(--transition);
}

.method-step:hover { transform: translateY(-4px); border-color: var(--color-cyan); }

.method-number {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 3.5rem;
    height: 3.5rem;
    background-color: var(--color-cyan);
    color: white;
    font-size: 1.5rem;
    font-weight: 800;
    border-radius: 50%;
    margin-bottom: 1.5rem;
    box-shadow: 0 4px 10px rgba(2, 132, 199, 0.3);
}

/* Module Details */
.module-header {
    background-color: var(--color-surface);
    padding: 3rem;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    margin-bottom: 3rem;
    border: 1px solid var(--color-border);
}

.lesson-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.lesson-item {
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 1.25rem 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: var(--transition);
}

.lesson-item:hover {
    border-color: var(--color-cyan);
    box-shadow: var(--shadow-sm);
    transform: translateX(4px);
}

.lesson-item.completed {
    border-color: var(--color-success);
    background-color: #f0fdf4;
}

/* Split Screen Layout for Lesson Page */
.lesson-layout {
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: 3rem;
    align-items: start;
}

.lesson-sidebar {
    position: sticky;
    top: 5.5rem;
    background-color: var(--color-surface);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--color-border);
}

.sidebar-nav-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem;
    border-radius: var(--radius-sm);
    color: var(--color-muted);
    font-size: 0.9rem;
    font-weight: 500;
    transition: var(--transition);
    text-decoration: none;
    margin-bottom: 0.25rem;
}

.sidebar-nav-item:hover {
    background-color: var(--color-bg-soft);
    color: var(--color-primary-dark);
}

.sidebar-nav-item.active {
    background-color: #e0f2fe;
    color: var(--color-primary-dark);
    font-weight: 600;
}

.sidebar-nav-item.completed {
    color: var(--color-success);
}

/* Lesson Content */
.lesson-content {
    background-color: var(--color-surface);
    padding: 4rem;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--color-border);
}

.lesson-body {
    max-width: 65ch; /* Optimal reading width */
    margin: 0 auto;
}

.example-box, .exercise-box, .prompt-box {
    padding: 1.5rem 2rem;
    margin: 2rem 0;
    border-radius: var(--radius-md);
    max-width: 65ch;
    margin-left: auto;
    margin-right: auto;
}

.example-box {
    background-color: #f0f9ff;
    border-left: 4px solid var(--color-cyan);
}

.exercise-box {
    background-color: #fff7ed;
    border-left: 4px solid var(--color-accent);
}

.summary-box {
    background-color: var(--color-bg-soft);
    border: 1px solid var(--color-border);
    padding: 1.5rem 2rem;
    margin: 2.5rem auto 0 auto;
    border-radius: var(--radius-md);
    text-align: center;
    font-weight: 600;
    color: var(--color-primary-dark);
    max-width: 65ch;
}

.lesson-navigation {
    display: flex;
    justify-content: space-between;
    margin-top: 3rem;
    padding-top: 2rem;
    border-top: 1px solid var(--color-border);
    max-width: 65ch;
    margin-left: auto;
    margin-right: auto;
}

/* Floating Action Bar Mobile */
.mobile-fab {
    display: none;
}

/* Quiz */
.quiz-container { max-width: 800px; margin: 0 auto; }
.quiz-question {
    background-color: var(--color-surface);
    padding: 3rem;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    margin-bottom: 2rem;
    border: 1px solid var(--color-border);
    display: none;
}
.quiz-question.active { display: block; animation: fadeIn 0.4s ease; }

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.quiz-options { display: flex; flex-direction: column; gap: 1rem; margin-top: 2rem; }
.quiz-option {
    padding: 1.25rem 1.5rem;
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition);
    font-weight: 500;
    font-size: 1.05rem;
}

.quiz-option:hover {
    background-color: var(--color-bg-soft);
    border-color: var(--color-cyan);
    transform: translateX(4px);
}

.quiz-option.selected {
    background-color: #f0f9ff;
    border-color: var(--color-cyan);
}
.quiz-option.correct {
    background-color: #ecfdf5;
    border-color: var(--color-success);
}
.quiz-option.incorrect {
    background-color: #fef2f2;
    border-color: #ef4444;
}

/* Responsive */
@media (max-width: 992px) {
    .lesson-layout { grid-template-columns: 1fr; gap: 2rem; }
    .lesson-sidebar { position: static; display: none; } /* Hide sidebar on small screens */
}

@media (max-width: 768px) {
    .menu-toggle { display: block; }
    .nav-menu {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background-color: var(--color-surface);
        flex-direction: column;
        padding: 1.5rem;
        box-shadow: var(--shadow-lg);
        border-top: 1px solid var(--color-border);
    }
    .nav-menu.show { display: flex; }
    
    .hero { padding: 3rem 1.5rem; }
    .lesson-content { padding: 2rem 1.5rem; margin-bottom: 5rem; }
    
    .mobile-fab {
        display: block;
        position: fixed;
        bottom: 0;
        left: 0;
        right: 0;
        background: var(--color-surface);
        padding: 1rem;
        box-shadow: 0 -4px 10px rgba(0,0,0,0.05);
        z-index: 40;
        text-align: center;
        border-top: 1px solid var(--color-border);
    }
}


/* Resource pages - IAGIR 95 */
.resource-hero-card {
    background: linear-gradient(135deg, var(--color-surface) 0%, #f0f9ff 100%);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 3rem;
    box-shadow: var(--shadow-md);
    margin-bottom: 2rem;
}

.resource-layout {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 320px;
    gap: 2rem;
    align-items: start;
}

.resource-main-card,
.resource-side-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 2.5rem;
    box-shadow: var(--shadow-md);
}

.resource-side-card {
    position: sticky;
    top: 5.5rem;
}

.resource-steps {
    list-style: decimal;
    padding-left: 1.5rem;
    margin: 1rem 0 2rem 0;
}

.resource-steps li,
.resource-checklist li {
    margin-bottom: 0.75rem;
    color: var(--color-muted);
    font-size: 1.05rem;
}

.resource-checklist {
    list-style: none;
    padding-left: 0;
    margin: 1rem 0 2rem 0;
}

.resource-checklist li::before {
    content: "⚠️";
    margin-right: 0.5rem;
}

.prompt-copy-grid {
    display: grid;
    gap: 1rem;
    margin: 1.5rem 0 2.5rem 0;
}

.prompt-copy-card {
    background: #f8fafc;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 1rem;
}

.prompt-copy-head {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
    margin-bottom: 0.75rem;
}

.prompt-copy-card pre {
    white-space: pre-wrap;
    word-break: break-word;
    font-family: var(--font-family);
    color: var(--color-primary-dark);
    background: white;
    border-radius: var(--radius-sm);
    padding: 1rem;
    border: 1px solid var(--color-border);
    margin: 0;
    line-height: 1.6;
}

.btn-copy-resource {
    padding: 0.45rem 0.8rem;
    font-size: 0.875rem;
    flex-shrink: 0;
}

@media (max-width: 992px) {
    .resource-layout { grid-template-columns: 1fr; }
    .resource-side-card { position: static; }
}

@media (max-width: 768px) {
    .resource-hero-card,
    .resource-main-card,
    .resource-side-card { padding: 1.5rem; }
    .prompt-copy-head { flex-direction: column; align-items: flex-start; }
    .btn-copy-resource { width: 100%; }
}