:root {
    --bg-color: #050505;
    --card-bg: rgba(20, 20, 22, 0.6);
    --primary: #8b5cf6; /* Vibrant Purple */
    --primary-hover: #7c3aed;
    --secondary: #ec4899; /* Pink */
    --text-main: #f8fafc;
    --text-muted: #a1a1aa;
    --danger: #f43f5e;
    --success: #10b981;
    --border: rgba(255, 255, 255, 0.1);
    --glass-bg: rgba(10, 10, 10, 0.8);
    --glass-border: rgba(255, 255, 255, 0.05);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Outfit', 'Inter', sans-serif;
}

body {
    background-color: var(--bg-color);
    background-image: 
        radial-gradient(circle at 15% 50%, rgba(139, 92, 246, 0.15), transparent 25%),
        radial-gradient(circle at 85% 30%, rgba(236, 72, 153, 0.15), transparent 25%);
    background-attachment: fixed;
    color: var(--text-main);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

header {
    background: var(--glass-bg);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--glass-border);
    padding: 1rem 2rem;
    position: sticky;
    top: 0;
    z-index: 100;
}

nav {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.nav-links {
    display: flex;
    gap: 1.5rem;
}

.nav-links a {
    color: var(--text-muted);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s, transform 0.2s;
    position: relative;
}

.nav-links a:hover, .nav-links a.active {
    color: var(--text-main);
}

.nav-links a::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: -4px;
    left: 0;
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    transition: width 0.3s;
}

.nav-links a:hover::after, .nav-links a.active::after {
    width: 100%;
}

main {
    flex: 1;
    max-width: 1200px;
    margin: 0 auto;
    padding: 3rem 2rem;
    width: 100%;
}

h1, h2, h3 {
    margin-bottom: 1rem;
    font-weight: 700;
}

h1 {
    font-size: 3rem;
    background: linear-gradient(135deg, #fff, #a1a1aa);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    line-height: 1.2;
}

.card {
    background: var(--card-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--border);
    border-radius: 1.25rem;
    padding: 2rem;
    margin-bottom: 1.5rem;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
    transition: transform 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275), box-shadow 0.4s ease;
}

.card:hover {
    transform: translateY(-8px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.6), 0 0 20px rgba(139, 92, 246, 0.2);
    border-color: rgba(139, 92, 246, 0.3);
}

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2rem;
}

/* Buttons */
.btn {
    display: inline-block;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: white;
    padding: 0.875rem 1.75rem;
    border-radius: 0.75rem;
    text-decoration: none;
    font-weight: 600;
    border: none;
    cursor: pointer;
    transition: opacity 0.3s, transform 0.2s, box-shadow 0.3s;
    box-shadow: 0 4px 15px rgba(139, 92, 246, 0.4);
}

.btn:hover {
    opacity: 0.9;
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(139, 92, 246, 0.6);
}

.btn.danger {
    background: linear-gradient(135deg, #ef4444, #f43f5e);
    box-shadow: 0 4px 15px rgba(239, 68, 68, 0.4);
}
.btn.secondary {
    background: rgba(255, 255, 255, 0.1);
    box-shadow: none;
}
.btn.secondary:hover {
    background: rgba(255, 255, 255, 0.2);
}

/* Streak Animations (Duolingo Style) */
@keyframes flameBounce {
    0%, 100% { transform: scale(1) rotate(0deg); filter: drop-shadow(0 0 10px rgba(249, 115, 22, 0.6)); }
    25% { transform: scale(1.15) rotate(-5deg); filter: drop-shadow(0 0 25px rgba(239, 68, 68, 0.9)); }
    50% { transform: scale(0.95) rotate(5deg); filter: drop-shadow(0 0 15px rgba(249, 115, 22, 0.6)); }
    75% { transform: scale(1.1) rotate(-2deg); filter: drop-shadow(0 0 20px rgba(239, 68, 68, 0.8)); }
}

.flame-icon {
    font-size: 3.5rem;
    display: inline-block;
    animation: flameBounce 2s ease-in-out infinite;
    transform-origin: bottom center;
    margin-bottom: 0.5rem;
}

.streak-card {
    text-align: center;
    background: linear-gradient(145deg, rgba(249, 115, 22, 0.15), rgba(239, 68, 68, 0.05));
    border: 2px solid rgba(249, 115, 22, 0.4);
    box-shadow: 0 10px 30px rgba(249, 115, 22, 0.2);
}
.streak-card:hover {
    border-color: rgba(239, 68, 68, 0.6);
    box-shadow: 0 15px 40px rgba(239, 68, 68, 0.4);
}

/* Tables */
.table-container {
    overflow-x: auto;
}
table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 1rem;
}
th, td {
    padding: 1.25rem 1rem;
    text-align: left;
    border-bottom: 1px solid var(--border);
}
th {
    background: rgba(255, 255, 255, 0.03);
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    font-size: 0.85rem;
    letter-spacing: 0.05em;
}
tr {
    transition: background 0.3s;
}
tr:hover {
    background: rgba(255, 255, 255, 0.03);
}

/* Checkboxes */
.status-btn {
    padding: 0.5rem 1rem;
    border-radius: 0.5rem;
    border: 1px solid var(--border);
    cursor: pointer;
    font-weight: 600;
    color: white;
    background: transparent;
    transition: all 0.3s;
    font-size: 0.875rem;
    margin-right: 0.5rem;
}
.btn-done:hover { border-color: var(--success); color: var(--success); }
.btn-done.active { background: var(--success); border-color: var(--success); color: #000; box-shadow: 0 0 10px rgba(16, 185, 129, 0.4); }

.btn-cantdo:hover { border-color: var(--danger); color: var(--danger); }
.btn-cantdo.active { background: var(--danger); border-color: var(--danger); color: #fff; box-shadow: 0 0 10px rgba(244, 63, 94, 0.4); }

/* Forms */
input, select, textarea {
    width: 100%;
    padding: 1rem;
    margin-bottom: 1.25rem;
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid var(--border);
    border-radius: 0.75rem;
    color: var(--text-main);
    font-family: inherit;
    transition: border-color 0.3s, box-shadow 0.3s;
}
input:focus, select:focus, textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(139, 92, 246, 0.2);
}
label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--text-muted);
    font-weight: 500;
}

/* Alternatives Panel */
.alternatives {
    background: rgba(244, 63, 94, 0.05);
    border-left: 4px solid var(--danger);
    padding: 1.25rem;
    margin-top: 1rem;
    border-radius: 0 0.5rem 0.5rem 0;
    display: none;
    animation: slideDown 0.3s ease-out;
}

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

.food-checkbox-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 1rem;
}

.food-checkbox-list label {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    cursor: pointer;
    color: var(--text-main);
    background: rgba(255,255,255,0.05);
    padding: 0.75rem;
    border-radius: 0.5rem;
    transition: background 0.2s;
    margin: 0;
}

.food-checkbox-list label:hover {
    background: rgba(255,255,255,0.1);
}

.food-checkbox-list input[type="checkbox"] {
    width: auto;
    margin: 0;
}

@media (max-width: 768px) {
    nav {
        flex-direction: column;
        gap: 1rem;
    }
    .nav-links {
        width: 100%;
        justify-content: space-around;
        flex-wrap: wrap;
    }
    h1 { font-size: 2.2rem; }
    .card { padding: 1.5rem; }
}