/* Variables / Root */
:root {
    --bg-primary: #0a0a0a;
    --bg-tertiary: #1a1a1a;
    --text-primary: #ffffff;
    --text-secondary: #e5e5e5;
    --accent-primary: #3b82f6;
    --accent-glow: rgba(59, 130, 246, 0.3);
    --border-primary: #2a2a2a;

    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-6: 1.5rem;

    --text-xs: 0.75rem;
    --text-sm: 0.875rem;
    --text-base: 1rem;

    --radius-md: 0.5rem;
    --radius-2xl: 1.5rem;

    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --shadow-xl: 0 16px 48px rgba(0, 0, 0, 0.6);
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: linear-gradient(135deg, var(--bg-primary) 0%, #111111 100%);
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-6);
}

/* Layout Components */
.auth-main {
    width: 100%;
    max-width: 500px;
}

.auth-container {
    background: #1f1f1f;
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-2xl);
    padding: var(--space-6);
    box-shadow: var(--shadow-xl);
}

/* Tab Navigation */
.auth-tabs {
    display: flex;
    margin-bottom: var(--space-6);
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
    padding: var(--space-1);
}

.tab-button {
    flex: 1;
    padding: var(--space-3) var(--space-4);
    background: none;
    border: none;
    color: var(--text-secondary);
    font-weight: 600;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    font-size: var(--text-base);
}

.tab-button.active {
    background: var(--accent-primary);
    color: var(--bg-primary);
}

.tab-button:hover:not(.active) {
    color: var(--text-primary);
}

/* Form Components */
.form-container {
    display: none;
}

.form-container.active {
    display: block;
    animation: fadeInUp 0.3s ease-out;
}

.form-group {
    margin-bottom: var(--space-6);
}

.form-label {
    display: block;
    margin-bottom: var(--space-2);
    font-weight: 500;
    color: var(--text-primary);
    font-size: var(--text-sm);
}

.form-input {
    width: 100%;
    padding: var(--space-3) var(--space-4);
    background: var(--bg-tertiary);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: var(--text-sm);
    transition: all var(--transition-fast);
    font-family: inherit;
}

/* Select Input Styling */
select.form-input {
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%23666666' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
    padding-right: 40px;
}

/* Input States */
.form-input:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

.form-input::placeholder {
    color: #666666;
}

/* Password Input Specific */
.form-password-requirements {
    font-size: var(--text-xs);
    color: #a0a0a0;
    margin-top: var(--space-1);
    font-style: italic;
}

.password-input-container {
    position: relative;
    display: flex;
    align-items: center;
}

.toggle-password {
    position: absolute;
    right: 12px;
    background: none;
    border: none;
    color: #666666;
    cursor: pointer;
    padding: 0;
    display: flex;
    align-items: center;
}

.toggle-password:hover {
    color: var(--text-primary);
}

/* Buttons */
.form-button {
    width: 100%;
    padding: var(--space-4) var(--space-6);
    background: var(--accent-primary);
    color: var(--bg-primary);
    border: none;
    border-radius: var(--radius-md);
    font-size: var(--text-base);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    margin-top: var(--space-6);
}

.form-button:hover {
    background: #2563eb;
    transform: translateY(-1px);
    box-shadow: 0 0 20px var(--accent-glow);
}

.clear-data-button {
    position: fixed;
    bottom: 1rem;
    left: 1rem;
    padding: 0.5rem 1rem;
    background: #ef4444;
    color: white;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    font-size: var(--text-sm);
    opacity: 0.7;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.clear-data-button:hover {
    opacity: 1;
    transform: translateY(-1px);
}

/* Toast Notifications */
#toast-container {
    position: fixed;
    right: 1rem;
    bottom: 1rem;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    z-index: 9999;
    pointer-events: none;
}

.toast {
    pointer-events: auto;
    background: rgba(30, 30, 30, 0.95);
    color: var(--text-primary);
    padding: 0.6rem 0.9rem;
    border-radius: 0.5rem;
    box-shadow: 0 8px 24px rgba(0,0,0,0.45);
    transform: translateY(8px);
    opacity: 0;
    transition: opacity 240ms ease, transform 240ms ease;
    font-size: 0.95rem;
    max-width: 320px;
}

.toast.visible {
    opacity: 1;
    transform: translateY(0);
}

.toast-success { border-left: 4px solid #16a34a; }
.toast-error { border-left: 4px solid #ef4444; }
.toast-info { border-left: 4px solid var(--accent-primary); }

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@media (max-width: 768px) {
    .auth-container {
        padding: var(--space-6);
    }
}

@media (max-width: 480px) {
    .auth-container {
        padding: var(--space-4);
    }
}