:root {
    --primary-color: #4285f4; /* Google Blue */
    --primary-hover: #357ae8;
    --bg-color: #f8f9fa;
    --card-bg: #fff;
    --text-color: #3c4043;
    --text-muted: #5f6368;
    --border-color: #dadce0;
    --shadow-soft: 0 1px 2px 0 rgba(60,64,67,.3), 0 1px 3px 1px rgba(60,64,67,.15);
    --shadow-hover: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --radius: 8px;
    --sidebar-width: 280px;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    overflow-x: hidden;
}

/* Authentication Page Styles */
.auth-page {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
}

.auth-container {
    width: 100%;
    max-width: 448px;
    padding: 24px;
}

.auth-header {
    text-align: center;
    margin-bottom: 32px;
}

.logo {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--text-color);
    letter-spacing: -0.5px;
}

.logo span {
    color: var(--primary-color);
}

.subtitle {
    font-size: 1rem;
    color: var(--text-muted);
    margin-top: 8px;
}

.auth-card {
    background: var(--card-bg);
    border-radius: var(--radius);
    box-shadow: var(--shadow-soft);
    padding: 32px;
    border: 1px solid var(--border-color);
}

.auth-tabs {
    display: flex;
    gap: 16px;
    margin-bottom: 24px;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 8px;
}

.auth-tabs button {
    background: none;
    border: none;
    font-size: 1rem;
    font-weight: 500;
    color: var(--text-muted);
    cursor: pointer;
    padding: 4px 8px;
    position: relative;
    transition: color 0.3s ease;
}

.auth-tabs button.active {
    color: var(--primary-color);
}

.auth-tabs button.active::after {
    content: '';
    position: absolute;
    bottom: -9px;
    left: 0;
    width: 100%;
    height: 3px;
    background-color: var(--primary-color);
    border-radius: 3px 3px 0 0;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-color);
}

.form-group input {
    width: 100%;
    padding: 12px 16px;
    border-radius: var(--radius);
    border: 1px solid var(--border-color);
    font-size: 1rem;
    outline: none;
    transition: all 0.3s ease;
}

.form-group input:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px rgba(66, 133, 244, 0.2);
}

.btn-primary {
    width: 100%;
    background-color: var(--primary-color);
    color: white;
    border: none;
    padding: 12px;
    border-radius: var(--radius);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.3s ease;
    margin-top: 8px;
}

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

/* Toast Notifications */
#toast-container {
    position: fixed;
    bottom: 24px;
    right: 24px;
    z-index: 9999;
}

.toast {
    background: #323232;
    color: white;
    padding: 12px 24px;
    border-radius: 4px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
    margin-top: 10px;
    display: flex;
    align-items: center;
    gap: 12px;
    animation: slideIn 0.3s ease-out forwards;
}

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

@keyframes fadeOut {
    to { opacity: 0; transform: translateY(10px); }
}

/* Base Utility Classes */
.hidden { display: none !important; }