@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap');

:root {
    --primary-color: #007bff;
    --futuristic-cyan: #00f0ff;
    --futuristic-glow: rgba(0, 240, 255, 0.5);
    --primary-gradient: linear-gradient(135deg, #0d6efd 0%, #0056b3 100%);
    --accent-gradient: linear-gradient(135deg, var(--futuristic-cyan) 0%, #667eea 100%);
    
    --dark-bg: #0a0a10;
    --dark-surface: #1a1a2e;
    --light-bg: #f4f7f9;
    --light-surface: #ffffff;

    --glass-bg-light: rgba(255, 255, 255, 0.6);
    --glass-border-light: rgba(255, 255, 255, 0.9);
    --glass-bg-dark: rgba(26, 26, 46, 0.7);
    --glass-border-dark: rgba(0, 240, 255, 0.2);
    
    --shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    --shadow-heavy: 0 20px 45px rgba(0, 0, 0, 0.2);
    --text-primary-light: #212529;
    --text-secondary-light: #6c757d;
    --text-primary-dark: #e0e0e0;
    --text-secondary-dark: #a0a0b0;

    --border-radius: 16px;
    --transition: all 0.4s cubic-bezier(0.25, 0.8, 0.25, 1);
}

[data-theme="dark"] {
    --bg-color: var(--dark-bg);
    --surface-color: var(--dark-surface);
    --glass-bg: var(--glass-bg-dark);
    --glass-border: var(--glass-border-dark);
    --text-primary: var(--text-primary-dark);
    --text-secondary: var(--text-secondary-dark);
}

[data-theme="light"] {
    --bg-color: var(--light-bg);
    --surface-color: var(--light-surface);
    --glass-bg: var(--glass-bg-light);
    --glass-border: var(--glass-border-light);
    --text-primary: var(--text-primary-light);
    --text-secondary: var(--text-secondary-light);
}

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

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    transition: background-color 0.3s ease, color 0.3s ease;
    position: relative;
}

.bg-animation::before, .bg-animation::after {
    content: '';
    position: fixed;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    background-repeat: repeat;
    z-index: -1;
    pointer-events: none;
    will-change: background-position;
    z-index: -1; 
}

.bg-animation::before {
    background-image: 
        linear-gradient(0deg, transparent 24%, var(--glass-border-dark) 25%, var(--glass-border-dark) 26%, transparent 27%, transparent 74%, var(--glass-border-dark) 75%, var(--glass-border-dark) 76%, transparent 77%, transparent),
        linear-gradient(90deg, transparent 24%, var(--glass-border-dark) 25%, var(--glass-border-dark) 26%, transparent 27%, transparent 74%, var(--glass-border-dark) 75%, var(--glass-border-dark) 76%, transparent 77%, transparent);
    background-size: 60px 60px;
    animation: moveCircuits 8s linear infinite;
    opacity: 0.5;
}

.bg-animation::after {
    background-image: radial-gradient(var(--futuristic-cyan) 1px, transparent 2px);
    background-size: 30px 30px;
    animation: moveCircuits 4s linear infinite reverse;
    opacity: 0.3;
}

[data-theme="light"] .bg-animation::before, [data-theme="light"] .bg-animation::after {
    opacity: 0.1;
}

@keyframes moveCircuits {
    0% { background-position: 0 0; }
    100% { background-position: 60px 60px; }
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 2rem 1rem;
    position: relative;
    z-index: 2;
}

.theme-toggle { position: fixed; top: 1rem; right: 1rem; z-index: 1000; }
.theme-btn {
    width: 50px; height: 50px; border-radius: 50%;
    border: 1px solid var(--glass-border);
    background: var(--glass-bg);
    backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px);
    cursor: pointer; transition: var(--transition);
    display: flex; align-items: center; justify-content: center;
    font-size: 1.5rem; box-shadow: var(--shadow);
    color: var(--text-primary);
}
.theme-btn:hover { transform: scale(1.1) rotate(15deg); box-shadow: var(--shadow-heavy); }

header { text-align: center; margin-bottom: 3rem; }
.header-content { padding: 2rem; }
header h1 {
    font-size: clamp(2.2rem, 5vw, 3.5rem);
    font-weight: 700; margin-bottom: 0.5rem;
    letter-spacing: -1px; color: var(--text-primary);
}
.gradient-text { background: var(--accent-gradient); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
header p { font-size: 1.1rem; color: var(--text-secondary); max-width: 600px; margin: 0 auto; }

.glass-morphism {
    background: var(--glass-bg);
    backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--glass-border);
    border-radius: var(--border-radius);
    padding: 2rem; box-shadow: var(--shadow);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.glass-morphism::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    border-radius: var(--border-radius);
    border: 2px solid transparent;
    background: linear-gradient(135deg, var(--futuristic-cyan), transparent, transparent, var(--futuristic-cyan)) border-box;
    mask: linear-gradient(#fff 0 0) padding-box, linear-gradient(#fff 0 0);
    mask-composite: destination-out;
    opacity: 0.3;
    transition: var(--transition);
}

.hover-lift:hover {
    transform: translateY(-10px) scale(1.02);
    box-shadow: 0 0 15px var(--futuristic-glow), 0 0 30px rgba(0,0,0,0.3);
}

.hover-lift:hover::before { opacity: 1; }

main { display: grid; gap: 2rem; }
.section-title { font-size: 1.5rem; font-weight: 600; margin-bottom: 1.5rem; }

.input-group { margin-bottom: 1.5rem; position: relative; }
.input-group label { display: block; font-weight: 500; margin-bottom: 0.5rem; color: var(--text-secondary); }

textarea {
    width: 100%; padding: 1rem;
    border: 1px solid var(--glass-border);
    border-radius: calc(var(--border-radius) - 4px);
    font-size: 1rem; font-family: inherit;
    background: transparent; color: var(--text-primary);
    transition: var(--transition); resize: vertical; min-height: 120px;
}

textarea:focus {
    outline: none;
    border-color: var(--futuristic-cyan);
    box-shadow: 0 0 10px var(--futuristic-glow);
}

.error-message {
    color: #dc3545; 
    font-size: 0.875rem;
    margin-top: 0.5rem;
    display: none; 
}

.action-btn {
    background: var(--primary-gradient);
    color: white; border: none; padding: 1rem 2rem;
    font-size: 1rem; font-weight: 600; border-radius: 50px;
    cursor: pointer; transition: var(--transition);
    width: 100%; box-shadow: 0 8px 25px rgba(0, 123, 255, 0.2);
    display: flex; align-items: center; justify-content: center; gap: 0.5rem;
    z-index: 999;
    position: relative;
}

.action-btn:hover { 
    transform: translateY(-3px) scale(1.03);
    box-shadow: 0 12px 35px rgba(0, 123, 255, 0.3), 0 0 15px var(--futuristic-glow);
}

.loading-indicator { display: flex; align-items: center; justify-content: center; gap: 1rem; margin-top: 1rem; color: var(--text-secondary); }
.spinner { width: 24px; height: 24px; border: 3px solid var(--futuristic-glow); border-top-color: var(--futuristic-cyan); border-radius: 50%; animation: spin 1s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }

.example-category h4 { margin-bottom: 1rem; color: var(--text-secondary); font-size: 1rem; font-weight: 500; }
.example-buttons { display: flex; flex-wrap: wrap; gap: 0.75rem; }

.example-btn {
    padding: 0.75rem 1.25rem; border: 1px solid var(--glass-border);
    border-radius: 50px; color: var(--text-primary);
    background: transparent; font-weight: 500;
    cursor: pointer; transition: var(--transition); font-size: 0.9rem;
    z-index: 999;
    position: relative;
}
.example-btn:hover { background: var(--futuristic-cyan); color: #000; border-color: var(--futuristic-cyan); transform: translateY(-2px); box-shadow: 0 0 10px var(--futuristic-glow); }

#result-container { margin-top: 2rem; }
.result-card { animation: resultFadeInUp 0.6s ease-out forwards; }
.result-header { padding: 1.5rem 2rem; display: flex; align-items: center; gap: 1rem; color: white; border-top-left-radius: var(--border-radius); border-top-right-radius: var(--border-radius); }
.result-card.confirmado .result-header { background: linear-gradient(135deg, #198754, #146c43); }
.result-card.falso .result-header { background: linear-gradient(135deg, #dc3545, #b02a37); }
.result-card.impreciso .result-header { background: linear-gradient(135deg, #ffc107, #d39e00); }
.result-card.insuficiente .result-header { background: linear-gradient(135deg, #6c757d, #5a6268); }
.result-card.error .result-header { background: linear-gradient(135deg, #dc3545, #b02a37); }
.verdict-icon { font-size: 2rem; }
.verdict-title { font-size: 1.75rem; font-weight: 700; margin: 0; }
.result-body { padding: 2rem; }
.result-section { margin-bottom: 2rem; }
.result-section:last-child { margin-bottom: 0; }
.result-section h3 { font-size: 1.25rem; font-weight: 600; margin-bottom: 1rem; color: var(--text-primary); }
.key-points-list { list-style: none; padding: 0; }
.key-point-item { display: flex; align-items: flex-start; gap: 0.75rem; padding: 0.75rem 0; border-bottom: 1px solid var(--glass-border); }
.key-point-item:last-child { border-bottom: none; }
.key-point-icon { font-size: 1.2rem; color: var(--futuristic-cyan); }
.sources-list { display: flex; flex-direction: column; gap: 1rem; }
.source-item { padding: 1rem; border: 1px solid var(--glass-border); border-radius: calc(var(--border-radius) - 4px); transition: var(--transition); z-index: 999; position: relative; }
.source-item:hover { background-color: rgba(0,0,0,0.05); }
[data-theme="dark"] .source-item:hover { background-color: rgba(0, 240, 255, 0.05); }
.source-item a { font-weight: 600; color: var(--text-primary); text-decoration: none; margin-bottom: 0.25rem; font-size: 1rem; }
.source-item a:hover { text-decoration: underline; color: var(--futuristic-cyan); }
.source-item p { font-size: 0.9rem; color: var(--text-secondary); }

.collapsible-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--glass-border);
    margin-bottom: 1rem;
    transition: background-color 0.3s ease;
}

.collapsible-header:hover {
    background-color: rgba(0, 0, 0, 0.03);
}

[data-theme="dark"] .collapsible-header:hover {
    background-color: rgba(0, 240, 255, 0.03);
}

.collapsible-header h3 {
    margin-bottom: 0; 
}

.collapse-icon {
    font-size: 1.2rem;
    transition: transform 0.3s ease;
}

.collapsible-content {
    display: block; 
    overflow: hidden;
    transition: max-height 0.5s ease-out, opacity 0.5s ease-out;
    max-height: 1000px; 
    opacity: 1;
}

.collapsible-content.collapsed {
    max-height: 0;
    opacity: 0;
}

.fade-in-up { opacity: 0; transform: translateY(30px); animation: fadeInUp 0.8s ease-out forwards; }
@keyframes fadeInUp { to { opacity: 1; transform: translateY(0); } }
@keyframes resultFadeInUp { from { opacity: 0; transform: translateY(30px) scale(0.98); } to { opacity: 1; transform: translateY(0) scale(1); } }

@media (max-width: 768px) {
    .container { padding: 1rem; }
    header { margin-bottom: 2rem; }
    .glass-morphism, .header-content { padding: 1.5rem; }
}