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

:root {
    --primary: #e74c3c;
    --primary-dark: #c0392b;
    --secondary: #3498db;
    --success: #27ae60;
    --warning: #f39c12;
    --dark: #2c3e50;
    --light: #ecf0f1;
    --white: #ffffff;
    --shadow: 0 2px 10px rgba(0,0,0,0.1);
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--dark);
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Navbar */
.navbar {
    background: var(--white);
    box-shadow: var(--shadow);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    color: var(--primary);
}

.nav-links {
    display: flex;
    gap: 2rem;
}

.nav-links a {
    color: var(--dark);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s;
}

.nav-links a:hover {
    color: var(--primary);
}

/* Main Content */
main {
    background: var(--white);
    margin: 2rem auto;
    padding: 2rem;
    border-radius: 15px;
    box-shadow: var(--shadow);
    min-height: 70vh;
}

/* Pages */
.page {
    display: none;
    animation: fadeIn 0.3s;
}

.page.active {
    display: block;
}

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

/* Hero Section */
.hero {
    text-align: center;
    padding: 3rem 0;
}

.hero h2 {
    font-size: 2.5rem;
    color: var(--dark);
    margin-bottom: 1rem;
}

.hero p {
    font-size: 1.2rem;
    color: #7f8c8d;
    margin-bottom: 2rem;
}

/* Stats Cards */
.stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
    margin: 3rem 0;
}

.stat-card {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: var(--white);
    padding: 2rem;
    border-radius: 10px;
    box-shadow: var(--shadow);
    transition: transform 0.3s;
}

.stat-card:hover {
    transform: translateY(-5px);
}

.stat-card h3 {
    font-size: 3rem;
    margin-bottom: 0.5rem;
}

/* Buttons */
.btn-primary, .btn-secondary {
    padding: 1rem 2rem;
    font-size: 1.1rem;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s;
    font-weight: 600;
}

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

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(231, 76, 60, 0.3);
}

.btn-secondary {
    background: var(--light);
    color: var(--dark);
}

.btn-secondary:hover {
    background: #d5dbdb;
}

/* Filters */
.filters {
    display: flex;
    gap: 1rem;
    margin: 2rem 0;
    flex-wrap: wrap;
}

.filter-btn {
    padding: 0.5rem 1.5rem;
    border: 2px solid var(--light);
    background: var(--white);
    color: var(--dark);
    border-radius: 20px;
    cursor: pointer;
    transition: all 0.3s;
    font-weight: 500;
}

.filter-btn:hover {
    border-color: var(--primary);
    color: var(--primary);
}

.filter-btn.active {
    background: var(--primary);
    color: var(--white);
    border-color: var(--primary);
}

/* Search Box */
.search-box {
    margin: 2rem 0;
}

.search-box input {
    width: 100%;
    padding: 1rem;
    font-size: 1rem;
    border: 2px solid var(--light);
    border-radius: 8px;
    transition: border-color 0.3s;
}

.search-box input:focus {
    outline: none;
    border-color: var(--primary);
}

/* Cards Grid */
.cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 1.5rem;
    margin: 2rem 0;
}

.word-card, .verb-card {
    background: var(--white);
    border: 2px solid var(--light);
    border-radius: 10px;
    padding: 1.5rem;
    transition: all 0.3s;
    cursor: pointer;
}

.word-card:hover, .verb-card:hover {
    border-color: var(--primary);
    transform: translateY(-5px);
    box-shadow: var(--shadow);
}

.word-card h3, .verb-card h3 {
    color: var(--primary);
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
}

.word-card .translation, .verb-card .translation {
    color: var(--dark);
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
}

.word-card .type, .verb-card .type {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    background: var(--light);
    color: var(--dark);
    border-radius: 15px;
    font-size: 0.85rem;
    margin-top: 0.5rem;
}

/* Practice Modes */
.practice-modes {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin: 2rem 0;
}

.mode-card {
    background: linear-gradient(135deg, var(--secondary), #2980b9);
    color: var(--white);
    padding: 2rem;
    border-radius: 15px;
    text-align: center;
    cursor: pointer;
    transition: transform 0.3s;
    box-shadow: var(--shadow);
}

.mode-card:hover {
    transform: translateY(-10px);
}

.mode-card h3 {
    font-size: 2rem;
    margin-bottom: 1rem;
}

/* Practice Area */
.practice-area {
    margin-top: 2rem;
}

.practice-area.hidden {
    display: none;
}

.practice-controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    padding: 1rem;
    background: var(--light);
    border-radius: 8px;
}

.practice-stats {
    display: flex;
    gap: 2rem;
}

#practice-content {
    text-align: center;
    padding: 3rem;
}

.flashcard {
    background: var(--white);
    border: 3px solid var(--primary);
    border-radius: 15px;
    padding: 3rem;
    min-height: 300px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    transition: transform 0.3s;
}

.flashcard:hover {
    transform: scale(1.02);
}

.flashcard .word {
    font-size: 3rem;
    color: var(--primary);
    margin-bottom: 1rem;
}

.flashcard .translation {
    font-size: 1.5rem;
    color: var(--dark);
}

/* Loading */
.loading {
    text-align: center;
    padding: 3rem;
    color: #7f8c8d;
    font-size: 1.2rem;
}

/* Footer */
footer {
    background: var(--white);
    padding: 2rem 0;
    text-align: center;
    margin-top: 2rem;
}

/* Responsive */
@media (max-width: 768px) {
    .nav-links {
        gap: 1rem;
    }
    
    .hero h2 {
        font-size: 2rem;
    }
    
    .stats {
        grid-template-columns: 1fr;
    }
}




/* Sentences Styles */
.sentences-grid {
    display: grid;
    gap: 1.5rem;
    margin-top: 2rem;
}

.sentence-card {
    background: white;
    border-radius: 12px;
    padding: 1.5rem;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    transition: transform 0.2s, box-shadow 0.2s;
    border-left: 4px solid var(--primary);
}

.sentence-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}

.sentence-card.beginner {
    border-left-color: #4CAF50;
}

.sentence-card.intermediate {
    border-left-color: #FF9800;
}

.sentence-card.advanced {
    border-left-color: #F44336;
}

.sentence-header {
    margin-bottom: 1rem;
}

.difficulty-badge {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
}

.difficulty-badge.beginner {
    background: #E8F5E9;
    color: #2E7D32;
}

.difficulty-badge.intermediate {
    background: #FFF3E0;
    color: #E65100;
}

.difficulty-badge.advanced {
    background: #FFEBEE;
    color: #C62828;
}

.sentence-content {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.spanish-sentence {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-dark);
    margin: 0;
}

.english-sentence {
    font-size: 1rem;
    color: #666;
    font-style: italic;
    margin: 0;
}


/* Add this to your existing /public/css/style.css file */

/* ============================================
   MONEY SYSTEM STYLES
   ============================================ */

/* Balance Display in Header */
.user-balance {
    position: fixed;
    top: 20px;
    right: 20px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    padding: 15px 25px;
    border-radius: 15px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
    z-index: 1000;
    color: white;
    font-family: 'Arial', sans-serif;
}

.balance-container {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.balance-main {
    display: flex;
    align-items: center;
    gap: 10px;
}

.balance-label {
    font-size: 14px;
    font-weight: 600;
    opacity: 0.9;
}

.balance-amount {
    font-size: 24px;
    font-weight: bold;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.2);
}

.balance-stats {
    display: flex;
    gap: 15px;
    font-size: 12px;
    padding-top: 5px;
    border-top: 1px solid rgba(255, 255, 255, 0.3);
}

.balance-stats .earned {
    color: #4ade80;
    font-weight: 600;
}

.balance-stats .lost {
    color: #f87171;
    font-weight: 600;
}

/* Money Animation */
.money-animation {
    position: fixed;
    font-size: 48px;
    font-weight: bold;
    pointer-events: none;
    z-index: 9999;
    transition: all 1.2s ease-out;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
}

.money-earned {
    color: #22c55e;
    animation: float-up-earned 1.2s ease-out;
}

.money-lost {
    color: #ef4444;
    animation: float-up-lost 1.2s ease-out;
}

@keyframes float-up-earned {
    0% {
        transform: translate(-50%, -50%) scale(0.5);
        opacity: 0;
    }
    20% {
        transform: translate(-50%, -50%) scale(1.3);
        opacity: 1;
    }
    100% {
        transform: translate(-50%, -150%) scale(1);
        opacity: 0;
    }
}

@keyframes float-up-lost {
    0% {
        transform: translate(-50%, -50%) scale(0.5);
        opacity: 0;
    }
    20% {
        transform: translate(-50%, -50%) scale(1.3);
        opacity: 1;
    }
    100% {
        transform: translate(-50%, -150%) scale(1);
        opacity: 0;
    }
}

/* Pulse animation for balance update */
.balance-pulse {
    animation: pulse 0.5s ease-in-out;
}

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.1);
    }
}

/* Weekly Summary Card (optional) */
.weekly-summary {
    background: white;
    border-radius: 15px;
    padding: 20px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    margin: 20px 0;
}

.weekly-summary h3 {
    margin: 0 0 15px 0;
    color: #333;
    font-size: 18px;
}

.summary-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 15px;
}

.stat-item {
    padding: 15px;
    background: #f8f9fa;
    border-radius: 10px;
    text-align: center;
}

.stat-label {
    font-size: 12px;
    color: #666;
    margin-bottom: 5px;
}

.stat-value {
    font-size: 24px;
    font-weight: bold;
    color: #333;
}

.stat-value.positive {
    color: #22c55e;
}

.stat-value.negative {
    color: #ef4444;
}

/* Mobile responsive */
@media (max-width: 768px) {
    .user-balance {
        top: 10px;
        right: 10px;
        padding: 10px 15px;
    }
    
    .balance-amount {
        font-size: 20px;
    }
    
    .money-animation {
        font-size: 36px;
    }
}


.user-balance{position:fixed;top:20px;right:20px;background:linear-gradient(135deg,#667eea 0%,#764ba2 100%);padding:15px 25px;border-radius:15px;box-shadow:0 4px 15px rgba(0,0,0,0.2);z-index:1000;color:white;cursor:move;transition:box-shadow 0.2s}

.balance-container{display:flex;flex-direction:column;gap:8px}
.balance-main{display:flex;align-items:center;gap:10px}
.balance-label{font-size:14px;font-weight:600;opacity:0.9}
.balance-amount{font-size:24px;font-weight:bold;text-shadow:2px 2px 4px rgba(0,0,0,0.2)}
.balance-stats{display:flex;gap:15px;font-size:12px;padding-top:5px;border-top:1px solid rgba(255,255,255,0.3)}
.balance-stats .earned{color:#4ade80;font-weight:600}
.balance-stats .lost{color:#f87171;font-weight:600}
.money-animation{position:fixed;font-size:48px;font-weight:bold;pointer-events:none;z-index:9999;transition:all 1.2s ease-out;text-shadow:2px 2px 4px rgba(0,0,0,0.3)}
.money-earned{color:#22c55e;animation:float-up-earned 1.2s ease-out}
.money-lost{color:#ef4444;animation:float-up-lost 1.2s ease-out}
@keyframes float-up-earned{0%{transform:translate(-50%,-50%) scale(0.5);opacity:0}20%{transform:translate(-50%,-50%) scale(1.3);opacity:1}100%{transform:translate(-50%,-150%) scale(1);opacity:0}}
@keyframes float-up-lost{0%{transform:translate(-50%,-50%) scale(0.5);opacity:0}20%{transform:translate(-50%,-50%) scale(1.3);opacity:1}100%{transform:translate(-50%,-150%) scale(1);opacity:0}}
@media (max-width:768px){.user-balance{top:10px;right:10px;padding:10px 15px}.balance-amount{font-size:20px}.money-animation{font-size:36px}}