/* Google Fonts Import: Cinzel for title, Inter for body text */
@import url('https://fonts.googleapis.com/css2?family=Cinzel:wght@700&family=Inter:wght@400;500;700&family=Noto+Serif+JP:wght@400;700&display=swap');

:root {
    /* Indigo color palette (藍系の和色) */
    --ai-iro: #165E83;         /* 藍色 */
    --kon-iro: #192F57;        /* 紺色 */
    --kachi-iro: #0D314F;      /* 勝色 */
    --tetsu-kon: #17233D;      /* 鉄紺 */
    --koi-ai: #0F2350;         /* 濃藍 */
    --shiro-nezumi: #E0E0E0;   /* 白鼠 (light gray for text) */
    --gin-nezumi: #A0A0A0;     /* 銀鼠 (medium gray for placeholders) */
}

/* Basic Reset and Global Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html, body {
    height: 100%;
    overflow: hidden; /* Prevent scrollbars from gradient animation */
}

body {
    font-family: 'Inter', 'Noto Serif JP', sans-serif; /* Base font */
    color: var(--shiro-nezumi);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    position: relative; /* For z-indexing context */
    /* Animated Gradient Background */
    background: linear-gradient(-45deg, var(--koi-ai), var(--kachi-iro), var(--kon-iro), var(--tetsu-kon));
    background-size: 400% 400%;
    animation: gradientFlow 10s ease-in-out infinite;
}

/* Gradient Animation Keyframes */
@keyframes gradientFlow {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

/* Login Wrapper to center content */
.login-wrapper {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    width: 100%;
    padding: 20px;
    z-index: 1; /* Above background */
}

/* Semi-transparent Login Box */
.login-box {
    background: rgba(15, 35, 80, 0.65); /* Dark semi-transparent indigo */
    padding: 40px 50px;
    border-radius: 12px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(8px); /* Frosted glass effect */
    -webkit-backdrop-filter: blur(8px); /* Safari support */
    border: 1px solid rgba(255, 255, 255, 0.1);
    width: 100%;
    max-width: 480px;
    text-align: center;
}

/* Main Title "ComPAS" */
.login-box h1 {
    font-family: 'Cinzel', serif;
    font-size: 3.5rem; /* Larger for impact */
    color: #FFFFFF;
    margin-bottom: 10px;
    letter-spacing: 2px;
    text-shadow: 0 0 10px rgba(255,255,255,0.3), 0 0 20px rgba(0,0,0,0.5);
}

/* Subtitle */
.login-box .subtitle {
    font-size: 0.95rem;
    color: var(--shiro-nezumi);
    margin-bottom: 35px;
    line-height: 1.6;
    font-weight: 400;
    opacity: 0.9;
}

/* Form Styling */
#loginForm {
    width: 100%;
}

.input-group {
    position: relative;
    margin-bottom: 25px;
}

.input-group label.sr-only { /* For accessibility, hidden visually */
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0,0,0,0);
    border: 0;
}

.input-group input {
    width: 100%;
    padding: 14px 20px;
    padding-right: 45px; /* Space for icon */
    background: rgba(0, 0, 0, 0.25);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 8px;
    color: var(--shiro-nezumi);
    font-size: 1rem;
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
}
.input-group input::placeholder {
    color: var(--gin-nezumi);
    opacity: 0.8;
}
.input-group input:focus {
    outline: none;
    border-color: var(--ai-iro);
    box-shadow: 0 0 0 3px rgba(22, 94, 131, 0.5);
}

/* Password Toggle Icon */
.password-group {
    position: relative;
}
.password-group .fa-eye, .password-group .fa-eye-slash {
    position: absolute;
    top: 50%;
    right: 18px;
    transform: translateY(-50%);
    color: var(--gin-nezumi);
    cursor: pointer;
    transition: color 0.3s ease;
}
.password-group .fa-eye:hover, .password-group .fa-eye-slash:hover {
    color: var(--shiro-nezumi);
}

/* Login Button */
button[type="submit"] {
    width: 100%;
    padding: 14px 20px;
    background: var(--ai-iro);
    color: #FFFFFF;
    border: none;
    border-radius: 8px;
    font-size: 1.1rem;
    font-weight: 700;
    font-family: 'Inter', 'Noto Serif JP', sans-serif;
    cursor: pointer;
    transition: background-color 0.3s ease, transform 0.1s ease;
    text-transform: uppercase;
    letter-spacing: 1px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.2);
}
button[type="submit"]:hover {
    background: var(--kon-iro); /* Darker shade on hover */
}
button[type="submit"]:active {
    transform: scale(0.98); /* Slight press effect */
}

/* Footer */
.footer {
    position: fixed;
    bottom: 20px;
    left: 0;
    width: 100%;
    text-align: center;
    color: rgba(224, 224, 224, 0.7); /* Lighter than gin-nezumi for footer */
    font-size: 0.9em;
    z-index: 2; /* Above login box if overlap occurs */
    text-shadow: 0 1px 2px rgba(0,0,0,0.5);
}

/* Responsive Adjustments */
@media (max-width: 768px) {
    .login-box h1 {
        font-size: 2.8rem;
    }
    .login-box .subtitle {
        font-size: 0.9rem;
        margin-bottom: 30px;
    }
    .login-box {
        padding: 30px 25px;
        margin: 0 15px; /* Add some margin on smaller screens */
    }
    .input-group input {
        padding: 12px 15px;
        padding-right: 40px;
    }
    button[type="submit"] {
        padding: 12px 15px;
        font-size: 1rem;
    }
}
@media (max-width: 480px) {
    .login-box h1 {
        font-size: 2.2rem;
    }
     .login-box .subtitle {
        font-size: 0.85rem;
    }
}