:root {
    --primary: #7c3aed;
    --primary-dark: #5b21b6;
    --primary-light: #a855f7;
    --background: #0f172a;
    --surface: #1e293b;
    --card: #334155;
    --text: #f8fafc;
    --text-light: #cbd5e1;
    --text-muted: #94a3b8;
    --border: #334155;
    --success: #10b981;
    --error: #ef4444;
    --gradient: linear-gradient(135deg, #1e293b 0%, #0f172a 100%);
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--gradient);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.auth-container {
    width: 100%;
    max-width: 400px;
}

.auth-card {
    background: var(--surface);
    border-radius: 20px;
    padding: 40px;
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.3), 0 10px 10px -5px rgba(0, 0, 0, 0.2);
    backdrop-filter: blur(10px);
    border: 1px solid var(--border);
}

.auth-header {
    text-align: center;
    margin-bottom: 30px;
}

.brand {
    font-size: 32px;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 8px;
}

.subtitle {
    color: var(--text-light);
    font-size: 16px;
}

.auth-tabs {
    display: flex;
    background: var(--card);
    border-radius: 12px;
    padding: 4px;
    margin-bottom: 30px;
}

.tab-btn {
    flex: 1;
    padding: 12px;
    border: none;
    background: transparent;
    border-radius: 8px;
    font-weight: 500;
    color: var(--text-muted);
    cursor: pointer;
    transition: all 0.2s ease;
}

.tab-btn.active {
    background: var(--surface);
    color: var(--text);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.tab-content {
    display: block;
}

.tab-content.hidden {
    display: none;
}

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

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

.form-group input {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid var(--border);
    border-radius: 10px;
    font-size: 16px;
    transition: all 0.2s ease;
    background: var(--background);
    color: var(--text);
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(124, 58, 237, 0.2);
}

/* Inline hints and rows */
.input-hint {
    margin-top: 8px;
    font-size: 12px;
    color: var(--text-muted);
}

.input-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    margin-top: 8px;
}

/* Password field with toggle */
.password-field {
    position: relative;
    display: flex;
    align-items: center;
}

.password-field input {
    padding-right: 44px;
}

.toggle-password {
    position: absolute;
    right: 8px;
    top: 50%;
    transform: translateY(-50%);
    background: transparent;
    border: none;
    width: 32px;
    height: 32px;
    border-radius: 8px;
    cursor: pointer;
    color: var(--text-muted);
}

.toggle-password:hover {
    color: var(--text);
    background: rgba(255,255,255,0.05);
}

.caps-lock {
    color: var(--error);
    font-size: 12px;
}

/* Password strength meter */
.password-meter {
    flex: 1;
    height: 8px;
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 9999px;
    overflow: hidden;
}

.password-meter-bar {
    height: 100%;
    width: 0%;
    background: var(--error);
    transition: width 0.2s ease, background 0.2s ease;
}

/* Form row */
.form-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin: 10px 0 20px;
}

.remember-me {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    color: var(--text-light);
    user-select: none;
}

.forgot-link {
    color: var(--primary);
    text-decoration: none;
    font-size: 14px;
}

.forgot-link:hover {
    color: var(--primary-light);
    text-decoration: underline;
}

/* Secondary button */
.secondary-btn {
    padding: 12px 16px;
    background: transparent;
    border: 2px solid var(--border);
    color: var(--text);
    border-radius: 10px;
    font-weight: 600;
    cursor: pointer;
}

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

/* Modal */
.modal {
    position: fixed;
    inset: 0;
    display: none;
}

.modal.open { display: block; }

.modal-backdrop {
    position: absolute;
    inset: 0;
    background: rgba(0,0,0,0.6);
}

.modal-content {
    position: relative;
    width: 100%;
    max-width: 420px;
    margin: 10vh auto;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 20px;
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.4);
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 10px;
}

.modal-close {
    background: transparent;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    font-size: 18px;
}

.modal-body p {
    color: var(--text-light);
    margin-bottom: 10px;
}

.modal-actions {
    display: flex;
    gap: 10px;
    margin-top: 10px;
}

.modal-message {
    margin-top: 10px;
    font-size: 14px;
    padding: 10px;
    border-radius: 6px;
    text-align: center;
}

.modal-message.success {
    background: rgba(16, 185, 129, 0.1);
    color: #10b981;
    border: 1px solid rgba(16, 185, 129, 0.2);
}

.modal-message.error {
    background: rgba(239, 68, 68, 0.1);
    color: #ef4444;
    border: 1px solid rgba(239, 68, 68, 0.2);
}

/* Forgot password steps */
.fp-step.hidden { display: none; }

.auth-btn {
    width: 100%;
    padding: 14px;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: 10px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
}

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

.auth-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

.auth-divider {
    text-align: center;
    margin: 30px 0;
    position: relative;
}

.auth-divider::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 0;
    right: 0;
    height: 1px;
    background: var(--border);
}

.auth-divider span {
    background: var(--surface);
    padding: 0 20px;
    color: var(--text-muted);
    font-size: 14px;
}

.anonymous-btn {
    width: 100%;
    padding: 14px;
    background: transparent;
    color: var(--text);
    border: 2px solid var(--border);
    border-radius: 10px;
    font-size: 16px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
}

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

.auth-footer {
    text-align: center;
    margin-top: 30px;
}

.auth-footer p {
    font-size: 12px;
    color: var(--text-muted);
    line-height: 1.5;
}

.error-message {
    background: #fef2f2;
    color: var(--error);
    padding: 12px;
    border-radius: 8px;
    margin-bottom: 20px;
    font-size: 14px;
    text-align: center;
    border: 1px solid var(--error);
}

.success-message {
    background: #f0fdf4;
    color: var(--success);
    padding: 12px;
    border-radius: 8px;
    margin-bottom: 20px;
    font-size: 14px;
    text-align: center;
    border: 1px solid var(--success);
}

/* Validation Styles */
.field-error {
    font-size: 12px;
    color: var(--error);
    margin-top: 4px;
    display: none;
    line-height: 1.4;
}

.field-error.show {
    display: block;
}

.field-help {
    font-size: 12px;
    color: var(--text-muted);
    margin-top: 4px;
    line-height: 1.4;
}

.form-group.error input,
.form-group.error select {
    border-color: var(--error);
    box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.1);
}

.form-group.success input,
.form-group.success select {
    border-color: var(--success);
    box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.1);
}

.checkbox-label {
    display: flex;
    align-items: flex-start;
    gap: 8px;
    cursor: pointer;
    font-size: 14px;
    line-height: 1.5;
    color: var(--text-light);
}

.checkbox-label input[type="checkbox"] {
    margin: 0;
    width: 16px;
    height: 16px;
    flex-shrink: 0;
    margin-top: 2px;
}

.checkbox-label a {
    color: var(--primary);
    text-decoration: none;
}

.checkbox-label a:hover {
    text-decoration: underline;
}

.validation-summary {
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid rgba(239, 68, 68, 0.3);
    border-radius: 8px;
    padding: 12px;
    margin-bottom: 20px;
    display: none;
}

.validation-summary.show {
    display: block;
}

.validation-summary h4 {
    color: var(--error);
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 8px;
}

.validation-summary ul {
    list-style: none;
    margin: 0;
    padding: 0;
}

.validation-summary li {
    color: var(--error);
    font-size: 13px;
    margin-bottom: 4px;
    padding-left: 16px;
    position: relative;
}

.validation-summary li:before {
    content: "•";
    position: absolute;
    left: 0;
    color: var(--error);
}

.password-strength {
    margin-top: 4px;
    font-size: 12px;
}

.password-strength.weak {
    color: var(--error);
}

.password-strength.medium {
    color: #f59e0b;
}

.password-strength.strong {
    color: var(--success);
}

.password-strength-indicator {
    height: 4px;
    background: var(--card);
    border-radius: 2px;
    margin-top: 4px;
    overflow: hidden;
}

.password-strength-bar {
    height: 100%;
    width: 0%;
    transition: width 0.3s ease, background-color 0.3s ease;
    border-radius: 2px;
}

.password-strength-bar.weak {
    background: var(--error);
    width: 33%;
}

.password-strength-bar.medium {
    background: #f59e0b;
    width: 66%;
}

.password-strength-bar.strong {
    background: var(--success);
    width: 100%;
}

.auth-links {
    text-align: center;
    margin-top: 20px;
    color: var(--text-light);
    font-size: 14px;
}

.auth-links a {
    color: var(--primary);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.2s;
}

.auth-links a:hover {
    color: var(--primary-light);
    text-decoration: underline;
}

@media (max-width: 480px) {
    .auth-card {
        padding: 30px 20px;
    }
    
    .brand {
        font-size: 28px;
    }
}