/* 🎨 CSS Custom Properties */
:root {
    --bg-primary: #0a0a0a;
    --bg-secondary: #111111;
    --bg-tertiary: #1a1a1a;
    --text-primary: #ffffff;
    --text-secondary: #a0a0a0;
    --text-muted: #666666;
    --accent-primary: #667eea;
    --accent-secondary: #764ba2;
    --accent-tertiary: #06b6d4;
    --success: #10b981;
    --warning: #f59e0b;
    --error: #ef4444;
    --border-primary: rgba(255, 255, 255, 0.1);
    --border-secondary: rgba(255, 255, 255, 0.05);
    --border-radius: 12px;
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
}

/* 🎨 Загальний стиль */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    position: relative;
}

/* 🎨 Фонові елементи */
.bg-elements {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    overflow: hidden;
}

.bg-circle {
    position: absolute;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    opacity: 0.1;
    animation: float 20s infinite ease-in-out;
}

.bg-circle-1 {
    width: 300px;
    height: 300px;
    top: -150px;
    left: -150px;
    animation-delay: 0s;
}

.bg-circle-2 {
    width: 200px;
    height: 200px;
    top: 50%;
    right: -100px;
    animation-delay: 7s;
}

.bg-circle-3 {
    width: 150px;
    height: 150px;
    bottom: -75px;
    left: 50%;
    animation-delay: 14s;
}

@keyframes float {
    0%, 100% { transform: translateY(0px) rotate(0deg); }
    33% { transform: translateY(-30px) rotate(120deg); }
    66% { transform: translateY(30px) rotate(240deg); }
}

/* 🎨 Контейнер логіна */
.login-container {
    width: 100%;
    max-width: 420px;
    padding: 20px;
    z-index: 1;
}

/* 🎨 Картка логіна */
.login-card {
    background: rgba(26, 26, 26, 0.8);
    backdrop-filter: blur(20px);
    border: 1px solid var(--border-primary);
    border-radius: var(--border-radius);
    padding: 40px;
    box-shadow: var(--shadow-xl);
    position: relative;
    overflow: hidden;
}

.login-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--accent-primary), transparent);
}

/* 🎨 Анімація появи */
.fade-in {
    animation: fadeInUp 0.8s ease-out forwards;
    opacity: 0;
    transform: translateY(30px);
}

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

/* 🎨 Заголовок */
.login-header {
    text-align: center;
    margin-bottom: 40px;
}

.logo-section {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    margin-bottom: 16px;
}

.logo-icon {
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 8px 32px rgba(99, 102, 241, 0.3);
}

.logo-icon .icon {
    width: 24px;
    height: 24px;
    color: white;
}

.logo-text {
    font-size: 2rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.02em;
}

.login-subtitle {
    color: var(--text-secondary);
    font-size: 1rem;
    font-weight: 500;
    margin: 0;
}

/* 🎨 Форма */
.login-form {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

/* 🎨 Групи введення */
.input-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.input-label {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
}

.input-label .icon {
    width: 16px;
    height: 16px;
    color: var(--accent-primary);
}

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

.form-input {
    width: 100%;
    padding: 16px 20px 16px 48px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-primary);
    border-radius: var(--border-radius);
    color: var(--text-primary);
    font-size: 16px;
    font-weight: 500;
    transition: all 0.3s ease;
    outline: none;
}

.form-input::placeholder {
    color: var(--text-muted);
    font-weight: 400;
}

.form-input:focus {
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
    background: var(--bg-tertiary);
}

.input-icon {
    position: absolute;
    left: 16px;
    width: 20px;
    height: 20px;
    color: var(--text-muted);
    pointer-events: none;
    transition: color 0.3s ease;
}

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

.password-toggle {
    position: absolute;
    right: 16px;
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: 4px;
    border-radius: 6px;
    transition: all 0.3s ease;
}

.password-toggle:hover {
    color: var(--accent-primary);
    background: rgba(99, 102, 241, 0.1);
}

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

/* 🎨 Кнопка входу */
.btn-login {
    width: 100%;
    padding: 16px 24px;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    border: none;
    border-radius: var(--border-radius);
    color: white;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    position: relative;
    overflow: hidden;
    margin-top: 8px;
}

.btn-login::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.5s ease;
}

.btn-login:hover::before {
    left: 100%;
}

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

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

.btn-text {
    font-weight: 600;
}

.btn-icon {
    width: 20px;
    height: 20px;
    transition: transform 0.3s ease;
}

.btn-login:hover .btn-icon {
    transform: translateX(4px);
}

/* 🎨 Повідомлення про помилки */
.error-message {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--error);
    font-size: 14px;
    font-weight: 500;
    margin-top: 8px;
    padding: 12px 16px;
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid rgba(239, 68, 68, 0.2);
    border-radius: 8px;
}

.error-message .icon {
    width: 16px;
    height: 16px;
    flex-shrink: 0;
}

/* 🎨 Футер */
.login-footer {
    margin-top: 32px;
    text-align: center;
}

.security-info {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    color: var(--text-muted);
    font-size: 14px;
    font-weight: 500;
}

.security-info .icon {
    width: 16px;
    height: 16px;
    color: var(--success);
}

/* 🎨 Адаптивний дизайн */
@media (max-width: 480px) {
    .login-container {
        padding: 16px;
    }
    
    .login-card {
        padding: 32px 24px;
    }
    
    .logo-text {
        font-size: 1.75rem;
    }
    
    .form-input {
        padding: 14px 16px 14px 44px;
        font-size: 16px;
    }
    
    .input-icon {
        left: 14px;
        width: 18px;
        height: 18px;
    }
    
    .password-toggle {
        right: 14px;
    }
    
    .password-toggle .icon {
        width: 18px;
        height: 18px;
    }
}

/* 🎨 Темна тема (додаткові стилі) */
@media (prefers-color-scheme: dark) {
    .login-card {
        background: rgba(10, 10, 10, 0.9);
    }
}