:root {
    --bg-color: #0f172a;
    --card-bg: #1e293b;
    --accent-blue: #38bdf8;
    --text-main: #f1f5f9;
    --text-dim: #94a3b8;
    --error: #ef4444;
}

body, html {
    height: 100%;
    margin: 0;
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-main);
    display: flex;
    align-items: center;
    justify-content: center;
}

.login-container {
    width: 100%;
    max-width: 420px;
    padding: 20px;
}

.login-box {
    background: var(--card-bg);
    padding: 40px;
    border-radius: 16px;
    box-shadow: 0 10px 25px rgba(0,0,0,0.3), 0 0 1px rgba(255,255,255,0.1);
    border: 1px solid rgba(255,255,255,0.05);
}

.logo-section {
    text-align: center;
    margin-bottom: 35px;
}

.logo-section h1 {
    margin: 10px 0 5px 0;
    font-size: 28px;
    font-weight: 600;
    letter-spacing: -0.5px;
}

.logo-section span {
    color: var(--accent-blue);
}

.logo-section p {
    color: var(--text-dim);
    font-size: 14px;
    margin: 0;
}

.input-group {
    margin-bottom: 20px;
}

.input-group label {
    display: block;
    font-size: 13px;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-dim);
}

.input-group input {
    width: 100%;
    padding: 12px 16px;
    background: #0f172a;
    border: 1px solid #334155;
    border-radius: 8px;
    color: white;
    font-size: 15px;
    box-sizing: border-box;
    transition: border-color 0.2s;
}

.input-group input:focus {
    outline: none;
    border-color: var(--accent-blue);
}

button {
    width: 100%;
    padding: 14px;
    background: var(--accent-blue);
    border: none;
    border-radius: 8px;
    color: #0f172a;
    font-weight: 600;
    font-size: 16px;
    cursor: pointer;
    transition: opacity 0.2s, transform 0.1s;
    position: relative;
}

button:hover {
    opacity: 0.9;
}

button:active {
    transform: scale(0.98);
}

.error-msg {
    color: var(--error);
    font-size: 13px;
    margin-bottom: 15px;
    text-align: center;
    display: none;
}

.footer-note {
    margin-top: 30px;
    text-align: center;
    font-size: 11px;
    color: var(--text-dim);
}

/* Loading Animation */
.loader {
    display: none;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(15, 23, 42, 0.3);
    border-radius: 50%;
    border-top-color: #0f172a;
    animation: spin 0.8s linear infinite;
    position: absolute;
    left: 50%;
    top: 50%;
    margin-left: -10px;
    margin-top: -10px;
}

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

button.loading .btn-text {
    visibility: hidden;
}

button.loading .loader {
    display: block;
}