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

body {
    font-family: 'Noto Sans JP', sans-serif;
    background: linear-gradient(135deg, #1a1a2e, #16213e, #0f3460);
    color: #fff;
    min-height: 100vh;
}

.container {
    max-width: 640px;
    margin: 0 auto;
    padding: 20px 16px;
}

header {
    text-align: center;
    padding: 30px 0 20px;
}

h1 {
    font-size: 1.8rem;
    font-weight: 900;
    background: linear-gradient(90deg, #667eea, #764ba2);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.subtitle {
    margin-top: 8px;
    color: #aaa;
    font-size: 0.9rem;
}

.input-section {
    margin-top: 24px;
}

.step {
    margin-bottom: 28px;
}

.step h2 {
    font-size: 0.95rem;
    margin-bottom: 12px;
    color: #ccc;
    display: flex;
    align-items: center;
    gap: 8px;
}

.step-num {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 24px;
    height: 24px;
    background: linear-gradient(135deg, #667eea, #764ba2);
    border-radius: 50%;
    font-size: 0.75rem;
    font-weight: 700;
    color: #fff;
}

.option-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 8px;
}

.option-btn {
    background: rgba(255, 255, 255, 0.07);
    border: 2px solid transparent;
    color: #fff;
    padding: 12px 8px;
    border-radius: 12px;
    font-size: 0.85rem;
    font-family: inherit;
    cursor: pointer;
    transition: all 0.2s;
}

.option-btn:hover {
    background: rgba(255, 255, 255, 0.13);
}

.option-btn.active {
    border-color: #667eea;
    background: rgba(102, 126, 234, 0.15);
}

.severity-buttons {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 8px;
}

.severity-btn {
    background: rgba(255, 255, 255, 0.07);
    border: 2px solid transparent;
    color: #fff;
    padding: 14px 6px;
    border-radius: 12px;
    font-family: inherit;
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
}

.severity-btn:hover {
    background: rgba(255, 255, 255, 0.13);
}

.severity-btn.active {
    border-color: #667eea;
    background: rgba(102, 126, 234, 0.15);
}

.severity-emoji {
    font-size: 1.5rem;
}

.severity-label {
    font-size: 0.7rem;
}

.format-buttons {
    display: flex;
    gap: 8px;
}

.format-btn {
    flex: 1;
    background: rgba(255, 255, 255, 0.07);
    border: 2px solid transparent;
    color: #fff;
    padding: 10px 6px;
    border-radius: 10px;
    font-size: 0.8rem;
    font-family: inherit;
    cursor: pointer;
    transition: all 0.2s;
}

.format-btn:hover {
    background: rgba(255, 255, 255, 0.13);
}

.format-btn.active {
    border-color: #667eea;
    background: rgba(102, 126, 234, 0.15);
}

textarea {
    width: 100%;
    background: rgba(255, 255, 255, 0.07);
    border: 2px solid rgba(255, 255, 255, 0.1);
    color: #fff;
    padding: 12px;
    border-radius: 12px;
    font-family: inherit;
    font-size: 0.9rem;
    resize: vertical;
    min-height: 80px;
    outline: none;
    transition: border-color 0.2s;
}

textarea:focus {
    border-color: #667eea;
}

textarea::placeholder {
    color: #666;
}

.generate-btn {
    width: 100%;
    margin-top: 8px;
    padding: 16px;
    background: linear-gradient(90deg, #667eea, #764ba2);
    border: none;
    border-radius: 14px;
    color: #fff;
    font-size: 1.1rem;
    font-weight: 700;
    font-family: inherit;
    cursor: pointer;
    transition: all 0.3s;
}

.generate-btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

.generate-btn:not(:disabled):hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.4);
}

/* Result */
.result-section {
    margin-top: 32px;
    animation: fadeInUp 0.5s ease;
}

@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.result-card {
    background: rgba(255, 255, 255, 0.08);
    backdrop-filter: blur(10px);
    border-radius: 20px;
    padding: 24px;
    border: 1px solid rgba(255, 255, 255, 0.12);
}

.result-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 16px;
    flex-wrap: wrap;
    gap: 8px;
}

.result-tags {
    display: flex;
    gap: 6px;
    flex-wrap: wrap;
}

.tag {
    padding: 3px 10px;
    border-radius: 20px;
    font-size: 0.7rem;
    font-weight: 700;
}

.target-tag {
    background: rgba(102, 126, 234, 0.2);
    color: #667eea;
}

.situation-tag {
    background: rgba(118, 75, 162, 0.2);
    color: #a78bfa;
}

.severity-tag {
    background: rgba(255, 78, 80, 0.2);
    color: #ff6b6b;
}

.format-badge {
    font-size: 0.7rem;
    color: #888;
}

.apology-text {
    font-size: 1rem;
    line-height: 2;
    margin: 20px 0;
    padding: 20px;
    background: rgba(0, 0, 0, 0.25);
    border-radius: 12px;
    border-left: 4px solid #667eea;
    white-space: pre-wrap;
}

.sincerity-meter {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-top: 16px;
}

.meter-label {
    font-size: 0.8rem;
    color: #aaa;
    width: 72px;
}

.meter-bar {
    flex: 1;
    height: 10px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 5px;
    overflow: hidden;
}

.meter-fill {
    height: 100%;
    background: linear-gradient(90deg, #667eea, #764ba2);
    border-radius: 5px;
    transition: width 1s ease;
    width: 0;
}

.meter-value {
    font-weight: 700;
    font-size: 0.9rem;
    width: 36px;
    text-align: right;
}

.tip {
    margin-top: 16px;
    padding: 12px 16px;
    background: rgba(102, 126, 234, 0.1);
    border-radius: 10px;
    font-size: 0.8rem;
    color: #a0aec0;
    border-left: 3px solid #667eea;
}

/* Actions */
.action-buttons {
    display: flex;
    gap: 10px;
    margin-top: 16px;
}

.action-btn {
    flex: 1;
    padding: 12px;
    border: 2px solid rgba(255, 255, 255, 0.15);
    background: rgba(255, 255, 255, 0.05);
    color: #fff;
    border-radius: 12px;
    font-size: 0.85rem;
    font-family: inherit;
    cursor: pointer;
    transition: all 0.2s;
}

.action-btn:hover {
    background: rgba(255, 255, 255, 0.12);
}

.btn-x { background: rgba(0,0,0,0.4); border-color: rgba(255,255,255,0.3); }
.btn-line { background: rgba(6,199,85,0.15); border-color: rgba(6,199,85,0.4); color: #06c755; }
.btn-line:hover { background: rgba(6,199,85,0.25); }
.btn-copy { background: rgba(102,126,234,0.15); border-color: rgba(102,126,234,0.3); }
.btn-retry { width: 100%; }
.share-buttons { margin-bottom: 8px; }

/* Toast */
.toast {
    position: fixed;
    bottom: -50px;
    left: 50%;
    transform: translateX(-50%);
    background: #667eea;
    color: #fff;
    padding: 10px 24px;
    border-radius: 10px;
    font-weight: 700;
    font-size: 0.85rem;
    transition: bottom 0.3s ease;
    z-index: 100;
}

.toast.show {
    bottom: 30px;
}

footer {
    margin-top: 48px;
    text-align: center;
    color: #555;
    font-size: 0.75rem;
    padding-bottom: 24px;
}

footer .copyright {
    margin-top: 8px;
}

@media (max-width: 400px) {
    h1 { font-size: 1.4rem; }
    .option-grid { grid-template-columns: repeat(2, 1fr); }
    .severity-buttons { grid-template-columns: repeat(2, 1fr); }
    .format-buttons { flex-wrap: wrap; }
}