/* ==================== Variables ==================== */
:root {
    /* Colors - Light Mode */
    --primary: #6366f1;
    --primary-dark: #4f46e5;
    --primary-light: #818cf8;
    --secondary: #8b5cf6;
    --success: #10b981;
    --error: #ef4444;
    --warning: #f59e0b;
    
    --bg-primary: #ffffff;
    --bg-secondary: #f9fafb;
    --bg-tertiary: #f3f4f6;
    
    --text-primary: #111827;
    --text-secondary: #6b7280;
    --text-tertiary: #9ca3af;
    
    --border: #e5e7eb;
    --border-focus: #6366f1;
    
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    --radius-full: 9999px;
    
    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 300ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 500ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* Dark Mode Variables */
[data-theme="dark"] {
    --primary: #818cf8;
    --primary-dark: #6366f1;
    --primary-light: #a5b4fc;
    
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-tertiary: #334155;
    
    --text-primary: #f1f5f9;
    --text-secondary: #cbd5e1;
    --text-tertiary: #94a3b8;
    
    --border: #334155;
    --border-focus: #818cf8;
    
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.4);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.5);
}

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

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: 'Vazirmatn', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--bg-secondary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    transition: background-color var(--transition-base), color var(--transition-base);
}

/* Custom Scrollbar */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-tertiary);
}

::-webkit-scrollbar-thumb {
    background: var(--primary);
    border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--primary-dark);
}

/* ==================== Particle Background ==================== */
.particle-canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    pointer-events: none;
}

/* ==================== Main Container ==================== */
.login-container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-lg);
    position: relative;
    z-index: 1;
    animation: fadeIn 0.6s ease-out;
}

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

/* ==================== Theme Toggle ==================== */
.theme-toggle {
    position: fixed;
    top: var(--spacing-lg);
    left: var(--spacing-lg);
    width: 48px;
    height: 48px;
    border-radius: var(--radius-full);
    background: var(--bg-primary);
    border: 1px solid var(--border);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    transition: all var(--transition-base);
    box-shadow: var(--shadow-md);
    z-index: 100;
}

.theme-toggle:hover {
    transform: scale(1.1) rotate(15deg);
    box-shadow: var(--shadow-lg);
}

.theme-icon {
    position: absolute;
    transition: opacity var(--transition-base), transform var(--transition-base);
}

[data-theme="light"] .sun-icon {
    opacity: 1;
    transform: rotate(0deg);
}

[data-theme="light"] .moon-icon {
    opacity: 0;
    transform: rotate(180deg);
}

[data-theme="dark"] .sun-icon {
    opacity: 0;
    transform: rotate(-180deg);
}

[data-theme="dark"] .moon-icon {
    opacity: 1;
    transform: rotate(0deg);
}

/* ==================== Login Card ==================== */
.login-card {
    width: 100%;
    max-width: 440px;
    background: var(--bg-primary);
    border-radius: var(--radius-2xl);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-xl);
    border: 1px solid var(--border);
    backdrop-filter: blur(20px);
    position: relative;
    overflow: hidden;
    animation: slideUp 0.8s cubic-bezier(0.34, 1.56, 0.64, 1);
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(40px) scale(0.9);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

/* Glassmorphism Effect */
.login-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 200px;
    background: linear-gradient(
        135deg,
        var(--primary) 0%,
        var(--secondary) 100%
    );
    opacity: 0.05;
    border-radius: var(--radius-2xl) var(--radius-2xl) 50% 50%;
    z-index: 0;
}

/* ==================== Login Header ==================== */
.login-header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
    position: relative;
    z-index: 1;
}

.logo-container {
    display: flex;
    justify-content: center;
    margin-bottom: var(--spacing-lg);
}

.logo-circle {
    width: 80px;
    height: 80px;
    border-radius: var(--radius-full);
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 8px 32px rgba(99, 102, 241, 0.3);
    animation: logoFloat 3s ease-in-out infinite;
    position: relative;
}

@keyframes logoFloat {
    0%, 100% {
        transform: translateY(0px);
    }
    50% {
        transform: translateY(-10px);
    }
}

.logo-circle::before {
    content: '';
    position: absolute;
    width: 100%;
    height: 100%;
    border-radius: var(--radius-full);
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    filter: blur(20px);
    opacity: 0.5;
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
        opacity: 0.5;
    }
    50% {
        transform: scale(1.1);
        opacity: 0.7;
    }
}

.logo-circle svg {
    width: 40px;
    height: 40px;
    color: white;
    position: relative;
    z-index: 1;
}

.login-title {
    font-size: 1.875rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.login-subtitle {
    font-size: 0.938rem;
    color: var(--text-secondary);
    font-weight: 400;
}

/* ==================== Form Styles ==================== */
.login-form {
    position: relative;
    z-index: 1;
}

.form-group {
    margin-bottom: var(--spacing-lg);
    animation: formSlideIn 0.6s ease-out backwards;
}

.form-group:nth-child(1) {
    animation-delay: 0.1s;
}

.form-group:nth-child(2) {
    animation-delay: 0.2s;
}

@keyframes formSlideIn {
    from {
        opacity: 0;
        transform: translateX(-20px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.form-label {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
    transition: color var(--transition-fast);
}

.label-icon {
    font-size: 1.125rem;
}

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

.form-input {
    width: 100%;
    padding: 0.875rem 1rem;
    padding-left: 3rem;
    border: 2px solid var(--border);
    border-radius: var(--radius-lg);
    font-size: 1rem;
    font-family: inherit;
    background: var(--bg-primary);
    color: var(--text-primary);
    transition: all var(--transition-base);
    outline: none;
}

.form-input:focus {
    border-color: var(--border-focus);
    box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.1);
    transform: translateY(-2px);
}

.form-input:focus + .input-icon {
    color: var(--primary);
    transform: scale(1.2);
}

.form-input.error {
    border-color: var(--error);
    animation: shake 0.4s;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-10px); }
    75% { transform: translateX(10px); }
}

.input-icon {
    position: absolute;
    left: 1rem;
    font-size: 1.25rem;
    color: var(--text-tertiary);
    transition: all var(--transition-base);
    pointer-events: none;
}

.password-toggle {
    position: absolute;
    left: 1rem;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
    font-size: 1.25rem;
    color: var(--text-tertiary);
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
}

.password-toggle:hover {
    color: var(--primary);
    transform: scale(1.1);
}

.eye-icon {
    position: absolute;
    transition: opacity var(--transition-fast), transform var(--transition-fast);
}

.password-toggle .eye-icon.open {
    opacity: 1;
}

.password-toggle .eye-icon.closed {
    opacity: 0;
}

.password-toggle.active .eye-icon.open {
    opacity: 0;
}

.password-toggle.active .eye-icon.closed {
    opacity: 1;
}

.error-message {
    display: block;
    color: var(--error);
    font-size: 0.813rem;
    margin-top: var(--spacing-xs);
    min-height: 1.25rem;
    animation: errorSlideIn 0.3s ease-out;
}

@keyframes errorSlideIn {
    from {
        opacity: 0;
        transform: translateY(-5px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Password Strength Meter */
.password-strength {
    margin-top: var(--spacing-sm);
    opacity: 0;
    transition: opacity var(--transition-base);
}

.password-strength.visible {
    opacity: 1;
}

.strength-bar {
    height: 4px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-full);
    overflow: hidden;
    margin-bottom: var(--spacing-xs);
}

.strength-fill {
    height: 100%;
    width: 0;
    transition: all var(--transition-base);
    border-radius: var(--radius-full);
}

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

.strength-fill.medium {
    width: 66%;
    background: var(--warning);
}

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

.strength-text {
    font-size: 0.75rem;
    color: var(--text-tertiary);
}

/* Caps Lock Warning */
.caps-lock-warning {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    background: rgba(245, 158, 11, 0.1);
    color: var(--warning);
    padding: var(--spacing-sm);
    border-radius: var(--radius-md);
    font-size: 0.813rem;
    margin-top: var(--spacing-sm);
    animation: warningPulse 2s ease-in-out infinite;
}

@keyframes warningPulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.7;
    }
}

/* Form Options */
.form-options {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-lg);
    animation: formSlideIn 0.6s 0.3s ease-out backwards;
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    cursor: pointer;
    user-select: none;
}

.checkbox-label input[type="checkbox"] {
    display: none;
}

.checkbox-custom {
    width: 20px;
    height: 20px;
    border: 2px solid var(--border);
    border-radius: var(--radius-sm);
    position: relative;
    transition: all var(--transition-base);
    flex-shrink: 0;
}

.checkbox-label input[type="checkbox"]:checked + .checkbox-custom {
    background: var(--primary);
    border-color: var(--primary);
}

.checkbox-label input[type="checkbox"]:checked + .checkbox-custom::after {
    content: '✓';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: white;
    font-size: 0.75rem;
    font-weight: bold;
}

.checkbox-text {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.forgot-link {
    font-size: 0.875rem;
    color: var(--primary);
    text-decoration: none;
    transition: all var(--transition-fast);
    font-weight: 500;
}

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

/* Submit Button */
.btn-submit {
    width: 100%;
    padding: 1rem;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: white;
    border: none;
    border-radius: var(--radius-lg);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    position: relative;
    overflow: hidden;
    transition: all var(--transition-base);
    animation: formSlideIn 0.6s 0.4s ease-out backwards;
}

.btn-submit:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 24px rgba(99, 102, 241, 0.4);
}

.btn-submit:active {
    transform: translateY(0);
}

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

.btn-text,
.btn-loader {
    transition: opacity var(--transition-fast);
}

.btn-submit.loading .btn-text {
    opacity: 0;
}

.btn-submit.loading .btn-loader {
    opacity: 1;
}

.spinner {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-top-color: white;
    border-radius: var(--radius-full);
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

/* Ripple Effect */
.btn-ripple {
    position: absolute;
    border-radius: var(--radius-full);
    background: rgba(255, 255, 255, 0.5);
    transform: scale(0);
    animation: ripple 0.6s ease-out;
    pointer-events: none;
}

@keyframes ripple {
    to {
        transform: scale(4);
        opacity: 0;
    }
}

/* Biometric Button */
.btn-biometric {
    width: 100%;
    padding: 1rem;
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border: 2px dashed var(--border);
    border-radius: var(--radius-lg);
    font-size: 0.938rem;
    font-weight: 600;
    cursor: pointer;
    margin-top: var(--spacing-md);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    transition: all var(--transition-base);
}

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

.biometric-icon {
    font-size: 1.25rem;
}

/* Footer */
.login-footer {
    text-align: center;
    margin-top: var(--spacing-xl);
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--border);
    animation: formSlideIn 0.6s 0.5s ease-out backwards;
}

.footer-text {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
}

.register-link {
    color: var(--primary);
    text-decoration: none;
    font-weight: 600;
    transition: color var(--transition-fast);
}

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

.footer-links {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-md);
}

.footer-link {
    font-size: 0.813rem;
    color: var(--text-tertiary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.footer-link:hover {
    color: var(--primary);
}

.separator {
    color: var(--text-tertiary);
    font-size: 0.75rem;
}

/* Decorative Circles */
.decoration-circle {
    position: absolute;
    border-radius: var(--radius-full);
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    opacity: 0.05;
    filter: blur(60px);
    pointer-events: none;
    z-index: 0;
}

.circle-1 {
    width: 300px;
    height: 300px;
    top: -150px;
    right: -150px;
    animation: float1 20s ease-in-out infinite;
}

.circle-2 {
    width: 400px;
    height: 400px;
    bottom: -200px;
    left: -200px;
    animation: float2 25s ease-in-out infinite;
}

.circle-3 {
    width: 250px;
    height: 250px;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    animation: float3 30s ease-in-out infinite;
}

@keyframes float1 {
    0%, 100% {
        transform: translate(0, 0);
    }
    50% {
        transform: translate(30px, 30px);
    }
}

@keyframes float2 {
    0%, 100% {
        transform: translate(0, 0);
    }
    50% {
        transform: translate(-40px, 40px);
    }
}

@keyframes float3 {
    0%, 100% {
        transform: translate(-50%, -50%);
    }
    50% {
        transform: translate(-30%, -30%);
    }
}

/* Toast Notification */
.toast {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    background: var(--bg-primary);
    color: var(--text-primary);
    padding: 1rem 1.5rem;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    border: 1px solid var(--border);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    z-index: 1000;
    animation: toastSlideIn 0.3s ease-out;
    max-width: 400px;
}

.toast.hidden {
    animation: toastSlideOut 0.3s ease-out forwards;
}

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

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

.toast.success {
    border-right: 4px solid var(--success);
}

.toast.error {
    border-right: 4px solid var(--error);
}

.toast.warning {
    border-right: 4px solid var(--warning);
}

.toast-icon {
    font-size: 1.5rem;
    flex-shrink: 0;
}

.toast-message {
    font-size: 0.875rem;
    line-height: 1.5;
}

/* Loading Overlay */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(10px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    animation: fadeIn 0.3s;
}

.loading-content {
    text-align: center;
}

.loading-spinner {
    width: 60px;
    height: 60px;
    border: 4px solid rgba(255, 255, 255, 0.2);
    border-top-color: white;
    border-radius: var(--radius-full);
    animation: spin 1s linear infinite;
    margin: 0 auto var(--spacing-md);
}

.loading-text {
    color: white;
    font-size: 1rem;
    font-weight: 500;
}

/* Install Prompt */
.install-prompt {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: var(--bg-primary);
    border-top: 1px solid var(--border);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-xl);
    z-index: 9998;
    animation: slideUpPrompt 0.5s ease-out;
}

.install-prompt.hidden {
    animation: slideDownPrompt 0.5s ease-out forwards;
}

@keyframes slideUpPrompt {
    from {
        transform: translateY(100%);
    }
    to {
        transform: translateY(0);
    }
}

@keyframes slideDownPrompt {
    from {
        transform: translateY(0);
    }
    to {
        transform: translateY(100%);
    }
}

.install-prompt-content {
    max-width: 600px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.install-icon {
    font-size: 2rem;
}

.install-prompt p {
    flex: 1;
    min-width: 200px;
    color: var(--text-primary);
    font-size: 0.938rem;
}

.btn-install,
.btn-dismiss {
    padding: 0.625rem 1.25rem;
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-base);
    border: none;
}

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

.btn-install:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
}

.btn-dismiss {
    background: var(--bg-tertiary);
    color: var(--text-secondary);
}

.btn-dismiss:hover {
    background: var(--border);
}

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

/* Responsive Design */
@media (max-width: 768px) {
    .login-container {
        padding: var(--spacing-md);
    }
    
    .login-card {
        padding: var(--spacing-lg);
    }
    
    .login-title {
        font-size: 1.5rem;
    }
    
    .theme-toggle {
        width: 40px;
        height: 40px;
        top: var(--spacing-md);
        left: var(--spacing-md);
    }
    
    .toast {
        right: 1rem;
        bottom: 1rem;
        max-width: calc(100% - 2rem);
    }
    
    .install-prompt-content {
        flex-direction: column;
        text-align: center;
    }
    
    .btn-install,
    .btn-dismiss {
        width: 100%;
    }
}

@media (max-width: 480px) {
    .login-card {
        border-radius: var(--radius-xl);
    }
    
    .logo-circle {
        width: 60px;
        height: 60px;
    }
    
    .logo-circle svg {
        width: 30px;
        height: 30px;
    }
    
    .form-input {
        padding: 0.75rem 0.875rem;
        padding-left: 2.75rem;
    }
    
    .form-options {
        flex-direction: column;
        gap: var(--spacing-md);
        align-items: flex-start;
    }
}

/* Print Styles */
@media print {
    .theme-toggle,
    .toast,
    .loading-overlay,
    .install-prompt,
    .decoration-circle,
    .particle-canvas {
        display: none !important;
    }
}

/* Reduced Motion */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}