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

:root {
    --primary-color: #007AFF;
    --background: #F2F2F7;
    --surface: rgba(255, 255, 255, 0.8);
    --text-primary: #000000;
    --text-secondary: #8E8E93;
    --border-color: rgba(0, 0, 0, 0.1);
    --danger-color: #FF3B30;
    --glass: rgba(255, 255, 255, 0.7);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    background: var(--background);
    background-image: 
        radial-gradient(circle at 20% 50%, rgba(120, 119, 198, 0.3) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(255, 119, 198, 0.3) 0%, transparent 50%),
        radial-gradient(circle at 40% 20%, rgba(0, 122, 255, 0.3) 0%, transparent 50%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

.login-container {
    width: 100%;
    max-width: 400px;
    padding: 20px;
}

.login-box {
    background: var(--glass);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--border-color);
    border-radius: 24px;
    padding: 48px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.1);
}

.login-logo {
    text-align: center;
    margin-bottom: 20px;
}

.logo-icon {
    font-size: 64px;
    display: block;
    margin-bottom: 16px;
}

.login-logo h1 {
    font-size: 32px;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.login-box h2 {
    font-size: 20px;
    font-weight: 500;
    text-align: center;
    margin-bottom: 32px;
    color: var(--text-secondary);
}

.form-group {
    margin-bottom: 24px;
    position: relative;
}

.input-icon {
    position: absolute;
    left: 16px;
    top: 50%;
    transform: translateY(-50%);
    width: 20px;
    height: 20px;
    color: var(--text-secondary);
    pointer-events: none;
    z-index: 1;
}

.input-icon svg {
    width: 100%;
    height: 100%;
    stroke-width: 2;
}

.form-group input {
    width: 100%;
    padding: 16px 20px 16px 50px;
    border: 2px solid transparent;
    border-radius: 14px;
    font-size: 16px;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    background: white;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary-color);
    background: white;
    box-shadow: 0 0 0 4px rgba(0, 122, 255, 0.1);
    transform: translateY(-2px);
}

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

.login-btn {
    width: 100%;
    padding: 16px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    border: none;
    border-radius: 14px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    position: relative;
    overflow: hidden;
}

.login-btn::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, var(--secondary-color), var(--primary-color));
    opacity: 0;
    transition: opacity 0.3s ease;
}

.login-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 24px rgba(0, 122, 255, 0.3);
}

.login-btn:hover::before {
    opacity: 1;
}

.login-btn span,
.login-btn svg {
    position: relative;
    z-index: 1;
}

.login-btn svg {
    width: 20px;
    height: 20px;
    stroke-width: 2.5;
}

.error-message {
    background: rgba(255, 59, 48, 0.1);
    color: var(--danger-color);
    padding: 12px;
    border-radius: 8px;
    margin-bottom: 20px;
    font-size: 14px;
    text-align: center;
    border: 1px solid rgba(255, 59, 48, 0.2);
}