:root {
    --accent-color: #00aaff;
    --background-color: #121212;
    --form-bg: rgba(10, 10, 10, 0.65);
    --form-border: rgba(255, 255, 255, 0.2);
    --text-color: #e0e0e0;
    --input-bg: transparent;
    --input-border: #555;
    --label-color: #aaa;
    --error-bg: rgba(255, 85, 85, 0.1);
    --error-border: rgba(255, 85, 85, 0.5);
    --error-color: #ff5555;
    --dot-color: rgba(0, 170, 255, 0.5);
}

body {
    background-color: var(--background-color);
    color: var(--text-color);
    font-family: 'Poppins', sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
    overflow: hidden;
}

#particles-js {
    position: absolute;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    z-index: -1;
}

.login-container {
    background: var(--form-bg);
    padding: 2.5rem;
    border-radius: 15px;
    border: 1px solid var(--form-border);
    box-shadow: 0 0 30px rgba(0, 0, 0, 0.5);
    width: 360px;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    transition: transform 0.5s ease-in-out;
    position: relative;
}

.login-container.shake {
    animation: shake 0.5s ease-in-out;
}

@keyframes shake {
    0%, 100% {
        transform: translateX(0);
    }
    10%, 30%, 50%, 70%, 90% {
        transform: translateX(-7px);
    }
    20%, 40%, 60%, 80% {
        transform: translateX(7px);
    }
}

.logo-container {
    text-align: center;
    margin-bottom: 2rem;
}

.logo-container svg {
    width: 60px;
    height: 60px;
    fill: var(--accent-color);
}

.input-group {
    position: relative;
    margin-bottom: 2.5rem;
}

.input-icon {
    position: absolute;
    top: 50%;
    left: 5px;
    transform: translateY(-50%);
    width: 20px;
    height: 20px;
    fill: var(--label-color);
    transition: fill 0.3s ease;
}

label {
    position: absolute;
    top: 10px;
    left: 35px;
    color: var(--label-color);
    pointer-events: none;
    transition: all 0.3s ease;
}

input {
    width: 100%;
    padding: 10px 35px;
    border: none;
    border-bottom: 2px solid var(--input-border);
    background-color: var(--input-bg);
    color: var(--text-color);
    font-size: 1rem;
    box-sizing: border-box;
}

input:focus {
    outline: none;
    border-bottom-color: var(--accent-color);
}

input:focus + label,
input:not(:placeholder-shown) + label {
    top: -15px;
    font-size: 0.8rem;
    color: var(--accent-color);
}

input:focus ~ .input-icon {
    fill: var(--accent-color);
}

.toggle-password {
    position: absolute;
    top: 50%;
    right: 5px;
    transform: translateY(-50%);
    width: 22px;
    height: 22px;
    fill: var(--label-color);
    cursor: pointer;
    transition: fill 0.3s ease;
}

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

button {
    width: 100%;
    padding: 0.85rem;
    border: none;
    background-image: linear-gradient(45deg, var(--accent-color), #0055aa);
    color: white;
    border-radius: 8px;
    cursor: pointer;
    font-size: 1.1rem;
    font-weight: 600;
    box-sizing: border-box;
    transition: transform 0.2s ease, box-shadow 0.2s ease, background-color 0.2s;
    margin-top: 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

button:hover {
    transform: translateY(-3px);
    box-shadow: 0 5px 15px rgba(0, 170, 255, 0.3);
}

button:disabled {
    background-image: none;
    background-color: #555;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

.spinner {
    width: 18px;
    height: 18px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top-color: #fff;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    display: none;
}

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

.error-message {
    background-color: var(--error-bg);
    border: 1px solid var(--error-border);
    color: var(--error-color);
    padding: 0.75rem;
    border-radius: 8px;
    text-align: center;
    font-weight: 600;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    opacity: 0;
    transform: translateY(10px);
    transition: opacity 0.3s ease, transform 0.3s ease;
    visibility: hidden;
    margin-bottom: 1rem;
    height: 0;
    padding-top: 0;
    padding-bottom: 0;
    border-width: 0;
}

.error-message.show {
    height: auto;
    padding-top: 0.75rem;
    padding-bottom: 0.75rem;
    border-width: 1px;
    opacity: 1;
    transform: translateY(0);
    visibility: visible;
}

.error-message svg {
    width: 20px;
    height: 20px;
    fill: var(--error-color);
}