:root {
    --primary-color: #667eea;
    --primary-hover: #5568d3;
    --secondary-color: #764ba2;
    --bg-color: #f5f5f5;
    --card-bg: #ffffff;
    --text-color: #333333;
    --text-muted: #666666;
    --border-color: #e0e0e0;
    --input-bg: #ffffff;
    --header-bg: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    --toast-bg: #ffffff;
}

[data-theme="dark"] {
    --bg-color: #0f172a;
    --card-bg: #1e293b;
    --text-color: #f8fafc;
    --text-muted: #94a3b8;
    --border-color: #334155;
    --input-bg: #0f172a;
    --shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
    --toast-bg: #1e293b;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    transition: background-color 0.3s, color 0.3s;
    line-height: 1.5;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
}

/* Layout */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem 1rem;
}

/* Components */
.card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 1rem;
    padding: 2rem;
    box-shadow: var(--shadow);
    margin-bottom: 2rem;
    transition: background-color 0.3s, border-color 0.3s;
}

.brand-name {
    font-weight: 800;
    background: linear-gradient(135deg, #fff 0%, #e0e0e0 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.brand-name-color {
    font-weight: 800;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

/* Buttons */
.btn {
    padding: 0.75rem 1.5rem;
    border-radius: 0.5rem;
    font-weight: 600;
    transition: all 0.2s;
    cursor: pointer;
    border: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

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

.btn-primary:hover {
    background-color: var(--primary-hover);
    transform: translateY(-1px);
}

.btn-outline {
    background-color: transparent;
    border: 2px solid var(--primary-color);
    color: var(--primary-color);
}

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

/* Forms */
.form-group {
    margin-bottom: 1.5rem;
}

.form-label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--text-muted);
}

.form-control {
    width: 100%;
    padding: 0.75rem 1rem;
    border-radius: 0.5rem;
    border: 1px solid var(--border-color);
    background-color: var(--input-bg);
    color: var(--text-color);
    transition: border-color 0.2s;
}

.form-control:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

/* Navbar Utilities */
.nav-utils {
    display: flex;
    gap: 1rem;
    align-items: center;
}

.util-btn {
    background: none;
    border: none;
    color: inherit;
    font-size: 1.25rem;
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 0.5rem;
    transition: background-color 0.2s;
}

.util-btn:hover {
    background-color: rgba(255, 255, 255, 0.1);
}

/* Toasts */
.toast-container {
    position: fixed;
    top: 1rem;
    right: 1rem;
    z-index: 9999;
}

.toast {
    background-color: var(--toast-bg);
    color: var(--text-color);
    padding: 1rem 1.5rem;
    border-radius: 0.75rem;
    box-shadow: var(--shadow);
    margin-bottom: 0.75rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    min-width: 300px;
    border-left: 4px solid var(--primary-color);
    animation: slideIn 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.toast.success { border-left-color: #10b981; }
.toast.error { border-left-color: #ef4444; }
.toast.info { border-left-color: #3b82f6; }

@keyframes slideIn {
    from { transform: translateX(100%); opacity: 0; }
    to { transform: translateX(0); opacity: 1; }
}

@keyframes fadeOut {
    to { transform: translateX(20px); opacity: 0; }
}

/* Animations */
.fade-in {
    animation: fadeIn 0.5s ease-out;
}

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

/* Responsive */
@media (max-width: 768px) {
    .container {
        padding: 1rem;
    }
    .card {
        padding: 1.5rem;
    }
}