@charset "utf-8";

:root {
    /* 指定カラー（R G B） */
    --charcoal: rgb(76, 73, 72);
    --blue-main: rgb(0, 134, 209);
    --blue-light: rgb(98, 198, 242);
    --gradient: linear-gradient(135deg, var(--blue-main) 0%, var(--blue-light) 100%);
    --bg: #f4f7f9;
}

body {
    font-family: "Helvetica Neue", Arial, "Hiragino Kaku Gothic ProN", "Hiragino Sans", Meiryo, sans-serif;
    background-color: var(--bg);
    margin: 0;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    color: var(--charcoal);
}

header {
    padding: 15px 40px;
    background: white;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
    display: flex;
    align-items: center;
}

.company-logo {
    height: 35px;
    object-fit: contain;
}

main {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
}

.container {
    background: white;
    padding: 3rem 2rem;
    border-radius: 24px;
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.08);
    width: 100%;
    max-width: 400px;
    text-align: center;
}

.software-logo {
    margin-bottom: 1.5rem;
    object-fit: contain;
}

h1 {
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: 2rem;
}

.input-group {
    margin-bottom: 1.5rem;
    text-align: left;
}

label {
    display: block;
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 8px;
    padding-left: 4px;
}

input[type="password"] {
    width: 100%;
    padding: 14px;
    border: 2px solid #eef0f2;
    border-radius: 12px;
    font-size: 1rem;
    box-sizing: border-box;
    outline: none;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

input[type="password"]:focus {
    border-color: var(--blue-main);
    box-shadow: 0 0 0 4px rgba(0, 134, 209, 0.1);
}

input.error {
    border-color: #ef4444;
    background: #fffafa;
}

.error-text {
    color: #ef4444;
    font-size: 0.8rem;
    margin-top: 8px;
    font-weight: 600;
}

.btn {
    background: var(--gradient);
    color: white;
    border: none;
    width: 100%;
    padding: 16px;
    border-radius: 12px;
    font-size: 1rem;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(0, 134, 209, 0.25);
    margin-top: 5px;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0, 134, 209, 0.35);
}

.notes {
    margin-top: 2.5rem;
    padding: 1.25rem;
    background-color: #f8fafc;
    border-radius: 16px;
    text-align: left;
    border-left: 4px solid var(--charcoal);
}

.notes h3 {
    font-size: 0.85rem;
    margin: 0 0 10px 0;
}

.notes ul {
    margin: 0;
    padding-left: 1.1rem;
    font-size: 0.8rem;
    color: #4b5563;
}

.notes li {
    margin-bottom: 8px;
    line-height: 1.5;
}

.highlight-blue {
    color: var(--blue-main);
    font-weight: 700;
}

footer {
    display: flex;
    justify-content: center;
    margin-bottom: 1rem;
}

@media (max-width: 480px) {
    header {
        padding: 15px 20px;
    }

    .container {
        padding: 2rem 1.5rem;
    }
}