/**
 * ChordMaster - Authentication Pages Stylesheet
 * Professional login/register design
 */

/* ========================================
   CSS Variables
   ======================================== */
:root {
    --bg-primary: #0a0a0b;
    --bg-secondary: #111113;
    --bg-card: #18181b;
    --bg-input: #1e1e24;
    --bg-hover: #252530;

    --text-primary: #fafafa;
    --text-secondary: #a1a1aa;
    --text-muted: #71717a;

    --accent-primary: #8b5cf6;
    --accent-secondary: #a78bfa;
    --accent-glow: rgba(139, 92, 246, 0.25);

    --success: #22c55e;
    --warning: #eab308;
    --error: #ef4444;

    --border-color: rgba(255, 255, 255, 0.08);

    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;

    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.4);
    --shadow-glow: 0 0 40px var(--accent-glow);
}

/* ========================================
   Reset & Base
   ======================================== */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
}

a {
    color: var(--accent-primary);
    text-decoration: none;
    transition: color 0.2s;
}

a:hover {
    color: var(--accent-secondary);
}

/* ========================================
   Auth Container - Split Layout
   ======================================== */
.auth-container {
    display: flex;
    min-height: 100vh;
}

/* ========================================
   Left Side - Branding Panel
   ======================================== */
.auth-branding {
    flex: 1;
    background: linear-gradient(135deg, #1a1a2e 0%, #16162a 50%, #0f0f1a 100%);
    padding: 3rem;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    position: relative;
    overflow: hidden;
}

.auth-branding::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, var(--accent-glow) 0%, transparent 50%);
    animation: pulse 8s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 0.3; transform: scale(1); }
    50% { opacity: 0.5; transform: scale(1.1); }
}

.brand-content {
    position: relative;
    z-index: 1;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 3rem;
}

.logo-icon {
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, var(--accent-primary), #6366f1);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-glow);
}

.logo-icon svg {
    width: 28px;
    height: 28px;
    color: white;
}

.logo-text {
    font-size: 1.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.auth-branding h1 {
    font-size: 2.75rem;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 1.25rem;
    background: linear-gradient(180deg, #fff 0%, #a1a1aa 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.auth-branding > .brand-content > p {
    font-size: 1.1rem;
    color: var(--text-secondary);
    max-width: 400px;
    margin-bottom: 2.5rem;
}

/* Features List */
.features {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.feature {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    padding: 1rem;
    background: rgba(255, 255, 255, 0.03);
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
}

.feature-icon {
    font-size: 1.5rem;
    line-height: 1;
}

.feature-text {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.feature-text strong {
    font-weight: 600;
    color: var(--text-primary);
}

.feature-text span {
    font-size: 0.875rem;
    color: var(--text-muted);
}

/* Pricing Preview */
.pricing-preview {
    display: flex;
    gap: 1rem;
    margin-top: 2rem;
}

.plan {
    flex: 1;
    padding: 1.25rem;
    background: rgba(255, 255, 255, 0.03);
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
}

.plan-pro {
    border-color: var(--accent-primary);
    background: rgba(139, 92, 246, 0.1);
}

.plan-badge {
    display: inline-block;
    font-size: 0.65rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: 0.25rem 0.5rem;
    background: var(--bg-hover);
    border-radius: 4px;
    color: var(--text-muted);
    margin-bottom: 0.75rem;
}

.plan-pro .plan-badge {
    background: var(--accent-primary);
    color: white;
}

.plan h3 {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
}

.plan ul {
    list-style: none;
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.plan li {
    padding: 0.25rem 0;
}

.plan li::before {
    content: '✓ ';
    color: var(--success);
}

/* Brand Footer */
.brand-footer {
    position: relative;
    z-index: 1;
}

.brand-footer p {
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* ========================================
   Right Side - Form Panel
   ======================================== */
.auth-form-container {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem;
    background: var(--bg-secondary);
}

.auth-form-wrapper {
    width: 100%;
    max-width: 420px;
}

.auth-header {
    text-align: center;
    margin-bottom: 2rem;
}

.auth-header h2 {
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.auth-header p {
    color: var(--text-secondary);
}

/* ========================================
   Alerts
   ======================================== */
.alert {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    padding: 1rem;
    border-radius: var(--radius-md);
    margin-bottom: 1.5rem;
    font-size: 0.9rem;
}

.alert svg {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
    margin-top: 2px;
}

.alert-error {
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid rgba(239, 68, 68, 0.3);
    color: #fca5a5;
}

.alert-error svg {
    color: var(--error);
}

.alert-success {
    background: rgba(34, 197, 94, 0.1);
    border: 1px solid rgba(34, 197, 94, 0.3);
    color: #86efac;
}

.alert-success svg {
    color: var(--success);
}

/* ========================================
   Form Styles
   ======================================== */
.auth-form {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.form-group label {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

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

.input-icon {
    position: absolute;
    left: 1rem;
    width: 20px;
    height: 20px;
    color: var(--text-muted);
    pointer-events: none;
}

.input-wrapper input {
    width: 100%;
    padding: 0.875rem 1rem 0.875rem 2.75rem;
    background: var(--bg-input);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 1rem;
    transition: all 0.2s;
}

.input-wrapper input::placeholder {
    color: var(--text-muted);
}

.input-wrapper input:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

.input-hint {
    font-size: 0.75rem;
    color: var(--text-muted);
}

/* Toggle Password Button */
.toggle-password {
    position: absolute;
    right: 1rem;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0;
    color: var(--text-muted);
    transition: color 0.2s;
}

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

.toggle-password svg {
    width: 20px;
    height: 20px;
}

.hidden {
    display: none;
}

/* Password Strength Meter */
.password-strength {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-top: -0.5rem;
}

.strength-bar {
    flex: 1;
    height: 4px;
    background: var(--bg-hover);
    border-radius: 2px;
    overflow: hidden;
}

.strength-fill {
    height: 100%;
    width: 0;
    background: var(--error);
    transition: all 0.3s;
    border-radius: 2px;
}

.strength-text {
    font-size: 0.75rem;
    color: var(--text-muted);
    min-width: 70px;
}

/* Form Options Row */
.form-options {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.forgot-link {
    font-size: 0.875rem;
}

/* Checkbox */
.checkbox-wrapper {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    cursor: pointer;
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.checkbox-wrapper input {
    display: none;
}

.checkmark {
    width: 20px;
    height: 20px;
    border: 2px solid var(--border-color);
    border-radius: 4px;
    flex-shrink: 0;
    position: relative;
    transition: all 0.2s;
    margin-top: 1px;
}

.checkbox-wrapper input:checked + .checkmark {
    background: var(--accent-primary);
    border-color: var(--accent-primary);
}

.checkbox-wrapper input:checked + .checkmark::after {
    content: '';
    position: absolute;
    left: 6px;
    top: 2px;
    width: 5px;
    height: 10px;
    border: solid white;
    border-width: 0 2px 2px 0;
    transform: rotate(45deg);
}

/* ========================================
   Buttons
   ======================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.875rem 1.5rem;
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    border: none;
    text-decoration: none;
}

.btn svg {
    width: 20px;
    height: 20px;
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent-primary), #6366f1);
    color: white;
    box-shadow: var(--shadow-sm), 0 0 20px var(--accent-glow);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md), 0 0 30px var(--accent-glow);
}

.btn-block {
    width: 100%;
}

.btn-social {
    flex: 1;
    background: var(--bg-input);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 0.75rem 1rem;
}

.btn-social:hover:not(:disabled) {
    background: var(--bg-hover);
}

.btn-social:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-social svg {
    width: 18px;
    height: 18px;
}

.btn-ghost {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    width: 100%;
}

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

.btn-ghost .badge {
    background: var(--accent-primary);
    color: white;
    font-size: 0.65rem;
    padding: 0.2rem 0.5rem;
    border-radius: 4px;
    margin-left: 0.5rem;
}

/* ========================================
   Dividers & Footer
   ======================================== */
.auth-divider {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin: 1.5rem 0;
}

.auth-divider::before,
.auth-divider::after {
    content: '';
    flex: 1;
    height: 1px;
    background: var(--border-color);
}

.auth-divider span {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.social-buttons {
    display: flex;
    gap: 1rem;
}

.auth-footer {
    text-align: center;
    margin-top: 1.5rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border-color);
}

.auth-footer p {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.guest-option {
    margin-top: 1.5rem;
}

/* ========================================
   Responsive Design
   ======================================== */
@media (max-width: 1024px) {
    .auth-branding {
        display: none;
    }

    .auth-form-container {
        background: var(--bg-primary);
    }
}

@media (max-width: 480px) {
    .auth-form-container {
        padding: 1rem;
    }

    .auth-form-wrapper {
        max-width: 100%;
    }

    .form-row {
        grid-template-columns: 1fr;
    }

    .social-buttons {
        flex-direction: column;
    }
}