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

:root {
    --depth-black: #0b0b0b;
    --rich-dark: #121212;
    --panel-bg: rgba(18, 18, 18, 0.75);
    --text-primary: #efefef;
    --text-soft: #bbbbbb;
    --accent-steel: #c0c0c0;
    --accent-dim: #7e7e7e;
    --glow: rgba(255, 255, 255, 0.03);
    --border-subtle: rgba(255, 255, 255, 0.06);
    --transition: all 0.5s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    --error: #ff6b6b;
    --success: #6bff8b;
}

body {
    font-family: 'JetBrains Mono', monospace;
    background: var(--depth-black);
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    line-height: 1.5;
    font-weight: 400;
    letter-spacing: 0.2px;
    overflow-x: hidden;
}

#background {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    opacity: 0.5;
    pointer-events: none;
    filter: blur(0.8px) brightness(0.9);
}

header {
    position: relative;
    z-index: 10;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 36px;
    background: rgba(8, 8, 8, 0.4);
    backdrop-filter: blur(16px) saturate(180%);
    -webkit-backdrop-filter: blur(16px) saturate(180%);
    border-bottom: 1px solid var(--border-subtle);
    margin: 16px 24px 0 24px;
    border-radius: 64px;
    flex-wrap: wrap;
    gap: 16px 24px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo img {
    width: 36px;
    height: 36px;
    object-fit: contain;
    opacity: 0.9;
}

.logo h2 {
    font-size: 1.8rem;
    font-weight: 400;
    color: var(--text-primary);
    letter-spacing: 2px;
    text-transform: uppercase;
    border-left: 1px solid var(--accent-dim);
    padding-left: 16px;
    line-height: 1;
    font-family: 'Inter', sans-serif;
    font-weight: 300;
    text-shadow: 0 2px 5px rgba(0, 0, 0, 0.6);
}

nav {
    display: flex;
    gap: 20px;
}

.btn {
    text-decoration: none;
    padding: 10px 28px;
    font-size: 1rem;
    font-weight: 450;
    background: rgba(255, 255, 255, 0.02);
    color: var(--text-soft);
    border: none;
    border-radius: 100px;
    transition: var(--transition);
    letter-spacing: 1px;
    backdrop-filter: blur(4px);
    box-shadow: 0 8px 20px -12px black;
    text-transform: uppercase;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -10%;
    width: 120%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.06), transparent);
    transform: skewX(-15deg) translateX(-100%);
    transition: transform 0.9s ease;
}

.btn:hover {
    background: rgba(255, 255, 255, 0.1);
    color: white;
    transform: scale(1.02) translateY(-3px);
    box-shadow: 0 22px 30px -16px rgba(192, 192, 192, 0.3);
}

.btn:hover::before {
    transform: skewX(-15deg) translateX(100%);
}

.btn:active {
    transform: scale(0.98);
    transition: 0.1s;
}

.btn:disabled {
    opacity: 0.5;
    pointer-events: none;
}

main {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 40px 24px 20px;
    position: relative;
    z-index: 5;
    width: 100%;
}

.login-card {
    background: var(--panel-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-radius: 48px;
    padding: 50px 60px;
    max-width: 520px;
    width: 100%;
    box-shadow: 0 30px 60px -20px rgba(0, 0, 0, 0.8);
    border: 1px solid var(--border-subtle);
    opacity: 0;
    animation: fadeSlideUp 1s ease-out forwards;
}

.login-card h1 {
    font-size: 2.8rem;
    font-weight: 300;
    letter-spacing: 6px;
    text-transform: uppercase;
    margin-bottom: 12px;
    color: var(--text-primary);
    text-align: center;
}

.login-card .subtitle {
    text-align: center;
    color: var(--text-soft);
    margin-bottom: 40px;
    font-size: 1.1rem;
    font-weight: 320;
    border-bottom: 1px solid var(--border-subtle);
    padding-bottom: 20px;
}

.form-group {
    margin-bottom: 28px;
}

.form-group label {
    display: block;
    margin-bottom: 10px;
    color: var(--text-soft);
    font-size: 0.95rem;
    letter-spacing: 1px;
    text-transform: uppercase;
    font-weight: 350;
    padding-left: 12px;
}

.form-group input {
    width: 100%;
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid var(--border-subtle);
    border-radius: 40px;
    padding: 16px 24px;
    font-size: 1.1rem;
    color: var(--text-primary);
    font-family: inherit;
    transition: var(--transition);
    outline: none;
    backdrop-filter: blur(4px);
}

.form-group input:focus {
    border-color: var(--accent-steel);
    background: rgba(0, 0, 0, 0.5);
    box-shadow: 0 0 20px rgba(192, 192, 192, 0.1);
}

.form-group input::placeholder {
    color: #555;
    font-weight: 300;
    font-size: 1rem;
}

.form-group input.error {
    border-color: var(--error);
}

.checkbox-group {
    display: flex;
    align-items: center;
    gap: 12px;
    margin: 20px 0 30px;
    padding-left: 8px;
}

.checkbox-group input[type="checkbox"] {
    width: 20px;
    height: 20px;
    cursor: pointer;
    accent-color: var(--accent-steel);
    background: transparent;
    border: 1px solid var(--border-subtle);
    border-radius: 4px;
}

.checkbox-group label {
    color: var(--text-soft);
    font-size: 1rem;
    cursor: pointer;
    user-select: none;
}

.login-btn {
    width: 100%;
    padding: 18px 32px;
    font-size: 1.3rem;
    background: rgba(255, 255, 255, 0.05);
    margin: 10px 0 25px;
    border: 1px solid var(--border-subtle);
}

.register-link {
    text-align: center;
    color: var(--text-soft);
    font-size: 1rem;
}

.register-link a {
    color: var(--accent-steel);
    text-decoration: none;
    border-bottom: 1px solid transparent;
    transition: border-color 0.3s;
    font-weight: 400;
}

.register-link a:hover {
    border-bottom-color: var(--accent-steel);
}

.message {
    padding: 16px 24px;
    border-radius: 40px;
    margin-bottom: 24px;
    text-align: center;
    font-size: 0.95rem;
    animation: fadeIn 0.3s ease;
}

.message.error {
    background: rgba(255, 107, 107, 0.1);
    border: 1px solid rgba(255, 107, 107, 0.3);
    color: var(--error);
}

.message.success {
    background: rgba(107, 255, 139, 0.1);
    border: 1px solid rgba(107, 255, 139, 0.3);
    color: var(--success);
}

.forgot-password {
    text-align: right;
    margin-top: -15px;
    margin-bottom: 20px;
}

.forgot-password a {
    color: var(--text-soft);
    text-decoration: none;
    font-size: 0.9rem;
    transition: color 0.3s;
}

.forgot-password a:hover {
    color: var(--accent-steel);
}

footer {
    position: relative;
    z-index: 5;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 30px 48px;
    background: rgba(0, 0, 0, 0.2);
    backdrop-filter: blur(18px);
    -webkit-backdrop-filter: blur(18px);
    margin: 0 24px 20px 24px;
    border-radius: 80px;
    color: var(--text-soft);
    font-size: 0.95rem;
    flex-wrap: wrap;
    gap: 24px 36px;
    border: none;
}

.footer-links,
.socials {
    display: flex;
    gap: 32px;
    flex-wrap: wrap;
}

.footer-links a,
.socials a {
    text-decoration: none;
    color: #a0a0a0;
    transition: 0.25s ease;
    font-weight: 350;
    border: none;
    padding: 4px 0;
    position: relative;
}

.footer-links a::after,
.socials a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 1px;
    background: var(--accent-steel);
    transition: width 0.35s ease;
}

.footer-links a:hover,
.socials a:hover {
    color: white;
}

.footer-links a:hover::after,
.socials a:hover::after {
    width: 100%;
}

.copyright {
    color: #777;
    font-size: 0.9rem;
}

@media (max-width: 680px) {
    header {
        margin: 12px 16px 0;
        padding: 16px 24px;
        border-radius: 48px;
    }

    .logo h2 {
        font-size: 1.4rem;
        padding-left: 12px;
    }

    .btn {
        padding: 8px 20px;
    }

    .login-card {
        padding: 40px 30px;
        border-radius: 36px;
    }

    footer {
        margin: 0 16px 16px;
        padding: 24px 28px;
        border-radius: 48px;
        flex-direction: column;
        text-align: center;
    }

    .footer-links,
    .socials {
        justify-content: center;
        gap: 24px;
    }

    h1 {
        font-size: 2.4rem;
        letter-spacing: 4px;
    }
}

@media (max-width: 420px) {
    header {
        flex-direction: column;
    }

    .logo {
        width: 100%;
        justify-content: center;
    }

    nav {
        width: 100%;
        justify-content: center;
    }

    .login-card {
        padding: 30px 20px;
    }
}

@keyframes fadeSlideUp {
    0% {
        opacity: 0;
        transform: translateY(40px);
    }

    100% {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }

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