:root {
    --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --secondary-color: #4f46e5;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --error-color: #ef4444;
    --text-dark: #1f2937;
    --text-light: #6b7280;
    --bg-white: #ffffff;
    --bg-gray: #f9fafb;
    --border-color: #e5e7eb;
    --shadow: 0 20px 40px rgba(0,0,0,0.1);
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg-gray);
    color: var(--text-dark);
    line-height: 1.6;
}

.auth-container {
    max-width: 1200px;
    margin: 0 auto;
    background: var(--bg-white);
    min-height: 100vh;
    box-shadow: var(--shadow);
}

/* Header */
.header {
    background: var(--bg-white);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--secondary-color);
}

.nav-link {
    color: var(--text-light);
    text-decoration: none;
    font-weight: 500;
}

.nav-link:hover {
    color: var(--secondary-color);
}

/* Form Basics */
.form-container {
    padding: 2rem;
    max-width: 500px;
    margin: 0 auto;
}

.form-title {
    font-size: 1.8rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    color: var(--text-dark);
}

.form-description {
    color: var(--text-light);
    margin-bottom: 2rem;
}

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

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

.required::after {
    content: '*';
    color: var(--error-color);
    margin-left: 0.25rem;
}

input, select, textarea {
    width: 100%;
    padding: 0.75rem;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 1rem;
    transition: border-color 0.3s;
}

input:focus, select:focus, textarea:focus {
    outline: none;
    border-color: var(--secondary-color);
}

/* Buttons */
.btn {
    padding: 0.75rem 2rem;
    border: none;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    text-decoration: none;
    display: inline-block;
    text-align: center;
}

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

.btn-primary:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

.btn-secondary {
    background: var(--bg-gray);
    color: var(--text-dark);
    border: 1px solid var(--border-color);
}

.btn-full {
    width: 100%;
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

/* Google OAuth Button */
.google-auth-btn {
    width: 100%;
    padding: 12px 16px;
    background: white;
    border: 2px solid #e5e7eb;
    border-radius: 8px;
    font-weight: 500;
    color: #374151;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    transition: all 0.3s ease;
    font-size: 14px;
    margin-bottom: 1rem;
}

.google-auth-btn:hover {
    border-color: #d1d5db;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    transform: translateY(-1px);
}

/* Messages */
.error-message {
    background: #fee;
    color: #c33;
    padding: 0.75rem;
    border-radius: 6px;
    margin-bottom: 1rem;
    display: none;
}

.success-message {
    background: #efe;
    color: #363;
    padding: 0.75rem;
    border-radius: 6px;
    margin-bottom: 1rem;
    display: none;
}

.auth-switch {
    text-align: center;
    margin-top: 1.5rem;
    color: var(--text-light);
}

.auth-switch a {
    color: var(--secondary-color);
    text-decoration: none;
    font-weight: 500;
}