:root {
    --primary: #007AFF;
    --bg: #ffffff;
    --text: #1d1d1f;
    --muted: #6e6e73;
    --card-border: #e5e5ea;
    --rainbow: linear-gradient(45deg, #ff9a9e, #fad0c4, #ffecd2, #a1c4fd, #c2e9fb, #d4fc79, #84fab0);
}

* { margin: 0; padding: 0; box-sizing: border-box; -webkit-tap-highlight-color: transparent; }
body { font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif; background: var(--bg); color: var(--text); min-height: 100vh; display: flex; flex-direction: column; text-align: center; }

main { flex: 1; display: flex; flex-direction: column; align-items: center; justify-content: center; padding: 40px 16px; }
.calc-box { width: 100%; max-width: 800px; position: relative; z-index: 1; }

.rainbow-wrapper {
    padding: 4px; border-radius: 44px; background: var(--rainbow);
    background-size: 300%; animation: rainbowMove 6s linear infinite;
    margin-bottom: 40px; box-shadow: 0 20px 50px rgba(0,0,0,0.05);
}
@keyframes rainbowMove { 0% { background-position: 0% 50% } 50% { background-position: 100% 50% } 100% { background-position: 0% 50% } }

.opt-card { background: #fff; border-radius: 40px; padding: 45px 35px; border: none; position: relative; }
.studio-tag { font-size: 0.65rem; font-weight: 900; color: var(--primary); text-transform: uppercase; letter-spacing: 2px; display: block; margin-bottom: 25px; }

.form-grid { display: grid; grid-template-columns: 1fr; gap: 20px; text-align: left; margin-bottom: 25px; }
@media (min-width: 768px) { .form-grid { grid-template-columns: 1fr 1fr; } .full-width { grid-column: 1 / -1; } }

.input-group { margin-bottom: 5px; }
.input-group label { display: block; font-size: 0.75rem; font-weight: 800; color: var(--muted); text-transform: uppercase; margin-bottom: 8px; }
.input-group input, .input-group select { 
    width: 100%; padding: 14px; border-radius: 12px; border: 1.5px solid var(--card-border);
    font-size: 1rem; font-weight: 600; outline: none; background: #fff;
}
.input-group input:focus, .input-group select:focus { border-color: var(--primary); box-shadow: 0 0 0 3px rgba(0,122,255,0.1); }

.password-wrapper { position: relative; width: 100%; }
.toggle-password {
    position: absolute; right: 15px; top: 50%; transform: translateY(-50%);
    cursor: pointer; font-size: 1.1rem; color: var(--muted); user-select: none;
}

.checkbox-group { display: flex; align-items: center; gap: 10px; cursor: pointer; font-weight: 600; color: var(--text); }
.checkbox-group input { width: 18px; height: 18px; accent-color: var(--primary); }

button.primary-btn { width: 100%; padding: 18px; border: none; border-radius: 50px; font-weight: 800; font-size: 1rem; cursor: pointer; transition: 0.3s; text-transform: uppercase; letter-spacing: 1px; background: var(--primary); color: #fff; }
button.primary-btn:hover { transform: translateY(-2px); box-shadow: 0 8px 20px rgba(0,122,255,0.3); }
button.primary-btn:active { transform: scale(0.98); }

.qr-preview-container {
    background: #fbfbfd; padding: 30px; border-radius: 25px; border: 1px solid #f2f2f7;
    margin-top: 25px; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 20px;
}
.qr-wrapper { position: relative; width: 270px; height: 270px; display: flex; align-items: center; justify-content: center; }
#qrcode { background: white; padding: 15px; border-radius: 15px; box-shadow: 0 4px 15px rgba(0,0,0,0.05); transition: opacity 0.3s; }
.qr-logo { display: none; position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%); background: #fff; padding: 6px; border-radius: 8px; z-index: 10; }
.qr-placeholder { position: absolute; top: 0; left: 0; width: 100%; height: 100%; display: flex; flex-direction: column; align-items: center; justify-content: center; background: white; border: 2px dashed #e5e5ea; border-radius: 15px; color: var(--muted); z-index: 5; }

.action-row { display: flex; gap: 10px; width: 100%; max-width: 300px; }
.action-row button { flex: 1; padding: 12px; border-radius: 12px; border: none; font-weight: 700; cursor: pointer; transition: 0.2s; }
.btn-download { background: #1d1d1f; color: #fff; }
.btn-download:hover { background: #333; }
.btn-print { background: #f2f2f7; color: var(--text); border: 1px solid var(--card-border) !important; }
.btn-print:hover { background: #e5e5ea; }

.guide-container { width: 75%; margin: 40px auto; padding: 60px 30px; background: rgba(255,255,255,0.7); border-radius: 45px; border: 1px solid #f0f0f0; backdrop-filter: blur(20px); text-align: left; }
.guide-container h2 { font-size: 2.2rem; font-weight: 900; color: var(--primary); margin-bottom: 25px; letter-spacing: -1.5px; }
.guide-container h3 { font-size: 1.4rem; font-weight: 800; margin: 35px 0 15px; border-left: 5px solid var(--primary); padding-left: 15px; }
.guide-container p { font-size: 1.1rem; line-height: 1.8; color: #444; margin-bottom: 20px; font-weight: 500; }
.guide-container ul { list-style: none; margin: 20px 0; }
.guide-container li { margin-bottom: 12px; font-weight: 600; color: #333; position: relative; padding-left: 25px; }
.guide-container li::before { content: '→'; position: absolute; left: 0; color: var(--primary); }

.faq-section { width: 75%; margin: 40px auto; padding: 0 15px; text-align: left; }
.faq-section h2 { font-size: 2.2rem; font-weight: 900; color: var(--primary); margin-bottom: 25px; text-align: center; letter-spacing: -1.5px; }
.faq-item { border-bottom: 1px solid var(--card-border); margin-bottom: 15px; }
.faq-question { width: 100%; background: none; border: none; text-align: left; padding: 15px 0; font-size: 1.1rem; font-weight: 700; cursor: pointer; position: relative; padding-right: 30px; color: var(--text); }
.faq-question::after { content: '+'; position: absolute; right: 5px; top: 50%; transform: translateY(-50%); font-size: 1.5rem; font-weight: 300; color: var(--primary); transition: transform 0.3s; }
.faq-item.active .faq-question::after { transform: translateY(-50%) rotate(45deg); }
.faq-answer { max-height: 0; overflow: hidden; transition: max-height 0.4s ease-out; }
.faq-answer p { font-size: 1rem; line-height: 1.7; color: #444; padding: 0 0 20px; font-weight: 500; }

.disclaimer { padding: 40px; text-align: center; font-size: 0.75rem; color: #999; font-weight: 600; background: #fafafa; border-radius: 30px; margin: 20px; border: 1px dashed #eee; }

@media (max-width: 1024px) {
    .guide-container, .faq-section { width: 95%; }
}