* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', sans-serif;
}

:root {
    --background-color: #f5f7fa;
    --gradient-end: #c3cfe2;
    --text-color: #333;
    --box-bg: white;
    --border-color: #e1e1e1;
    --shadow-color: rgba(0, 0, 0, 0.1);
    --primary-color: #008080;
    --hover-color: #006666;
}

[data-theme="dark"] {
    --background-color: #1a1a1a;
    --gradient-end: #2d2d2d;
    --text-color: #ffffff;
    --box-bg: #2d2d2d;
    --border-color: #404040;
    --shadow-color: rgba(0, 0, 0, 0.3);
    --primary-color: #20B2AA;
    --hover-color: #008080;
}

body {
    min-height: 100vh;
    background: linear-gradient(135deg, var(--background-color) 0%, var(--gradient-end) 100%);
    color: var(--text-color);
}

.spinner {
    border: 3px solid var(--border-color);
    border-top: 3px solid var(--primary-color);
    border-radius: 50%;
    width: 24px;
    height: 24px;
    animation: spin 1s linear infinite;
}

.login-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(var(--background-color), 0.9);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
}

.login-box {
    background: var(--box-bg);
    padding: 2rem;
    border-radius: 15px;
    box-shadow: 0 8px 30px var(--shadow-color);
    width: 90%;
    max-width: 400px;
}

.login-box h2 {
    margin-bottom: 1.5rem;
    color: var(--primary-color);
    text-align: center;
}

.input-group {
    margin-bottom: 1rem;
}

.input-group input {
    width: 100%;
    padding: 0.8rem;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    outline: none;
    transition: border-color 0.3s;
    background: var(--box-bg);
    color: var(--text-color);
}

.input-group input:focus {
    border-color: var(--primary-color);
}

.login-btn {
    width: 100%;
    padding: 0.8rem;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s;
    font-size: medium;
}

.login-btn:hover {
    background: var(--hover-color);
}

.login-btn:disabled {
    background: #cccccc;
    cursor: not-allowed;
    opacity: 0.7;
}

.error-message {
    color: #ff3333;
    margin: 0.5rem 0;
    text-align: center;
    font-size: 0.9rem;
    display: none;
}

.password-group {
    position: relative;
}

.password-toggle {
    position: absolute;
    right: 12px;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    cursor: pointer;
    padding: 0;
    color: var(--text-color);
}

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

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


.login-btn .spinner {
    display: none;
    width: 16px;
    height: 16px;
    margin-left: 8px;
    border: 2px solid #fff;
    border-top: 2px solid transparent;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

.login-btn.loading {
    display: inline-block;
    align-items: center;
    justify-content: center;
}

.login-btn.loading .spinner {
    display: inline-block;
}

@keyframes spin {
    0% {
        transform: rotate(0deg);
    }

    100% {
        transform: rotate(360deg);
    }
}