/* Google Fontsからフォントを読み込み */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;700&family=Noto+Sans+JP:wght@400;500;700&display=swap');

:root {
    --bg-color: #f0f2f5;
    --card-bg: #ffffff;
    --font-color: #1c1e21;
    --primary-color: #1877f2;
    --primary-hover: #166fe5;
    --secondary-color: #42b72a;
    --secondary-hover: #36a420;
    --border-color: #dddfe2;
    --input-bg: #f5f6f7;
    --shadow: 0 2px 4px rgba(0, 0, 0, 0.1), 0 8px 16px rgba(0, 0, 0, 0.1);
}

body {
    font-family: 'Inter', 'Noto Sans JP', sans-serif;
    background-color: var(--bg-color);
    color: var(--font-color);
    display: flex;
    justify-content: center;
    align-items: flex-start; /* 上寄せに変更 */
    min-height: 100vh;
    margin: 0;
    padding: 2rem 1rem; /* 上下のパディングを追加 */
    box-sizing: border-box;
}

.container {
    background-color: var(--card-bg);
    padding: 2rem;
    border-radius: 12px;
    box-shadow: var(--shadow);
    width: 100%;
    max-width: 600px; /* 横幅を少し広げる */
    text-align: center;
}

h1 {
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
}

#passphrase-list {
    display: grid;
    gap: 0.75rem;
    margin-bottom: 1.5rem;
    text-align: left;
}

.passphrase-item {
    background-color: var(--input-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 0.75rem 1rem;
    font-family: 'Courier New', Courier, monospace;
    word-wrap: break-word;
    width: 100%;
    box-sizing: border-box;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.passphrase-text {
    flex-grow: 1;
    font-size: 1.1rem;
}

.copy-btn {
    background-color: transparent;
    border: none;
    cursor: pointer;
    padding: 6px;
    margin-left: 1rem;
    border-radius: 50%;
    transition: background-color 0.2s;
}
.copy-btn:hover {
    background-color: #e4e6eb;
}
.copy-btn svg {
    width: 20px;
    height: 20px;
    fill: #606770;
    display: block;
}

.options {
    text-align: left;
    margin-bottom: 2rem;
    display: grid;
    gap: 1rem;
}

.option {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    padding: 0.75rem;
    background: #fcfcfc;
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.option-header {
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.option label, .radio-label {
    font-weight: 500;
    font-size: 0.95rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.radio-group {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    padding-top: 0.5rem;
}

.slider-container, .count-container {
    display: flex;
    align-items: center;
    gap: 1rem;
}

input[type="range"] {
    width: 120px;
    cursor: pointer;
}

#length-value {
    font-weight: 700;
    font-size: 1rem;
    min-width: 25px;
    text-align: right;
    color: var(--primary-color);
}

#passphrase-count {
    width: 60px;
    padding: 4px 8px;
    border-radius: 6px;
    border: 1px solid var(--border-color);
    text-align: center;
    font-size: 1rem;
}

.switch {
    position: relative;
    display: inline-block;
    width: 44px;
    height: 24px;
}
.switch input { 
    opacity: 0;
    width: 0;
    height: 0;
}
.slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: #ccc;
    transition: .4s;
    border-radius: 24px;
}
.slider:before {
    position: absolute;
    content: "";
    height: 18px;
    width: 18px;
    left: 3px;
    bottom: 3px;
    background-color: white;
    transition: .4s;
    border-radius: 50%;
}
input:checked + .slider {
    background-color: var(--primary-color);
}
input:checked + .slider:before {
    transform: translateX(20px);
}

#generate-button {
    background: linear-gradient(90deg, var(--secondary-color), #5fbe4c);
    color: white;
    border: none;
    border-radius: 8px;
    padding: 1rem;
    font-size: 1.1rem;
    font-weight: 700;
    cursor: pointer;
    width: 100%;
    transition: all 0.2s ease-in-out;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

#generate-button:hover {
    filter: brightness(1.05);
    box-shadow: 0 4px 8px rgba(0,0,0,0.15);
}

#generate-button:active {
    transform: scale(0.98);
    filter: brightness(1);
}

.copy-feedback {
    color: var(--primary-color);
    font-weight: 500;
    height: 20px; /* メッセージ用のスペースを確保 */
    transition: opacity 0.3s;
    margin-top: -1rem;
    margin-bottom: 1rem;
}