:root {
    --primary: #c62828;
    --primary-dark: #8e0000;
    --accent: #fff5f5;
    --text-dark: #2d2e32;
    --text-light: #6b7280;
    --border: #e5e7eb;
    --radius: 12px;
}

* { box-sizing: border-box; -webkit-tap-highlight-color: transparent; }

body {
    background-color: #f3f4f6;
    margin: 0;
    padding: 12px;
    font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
    color: var(--text-dark);
}

.form-container { max-width: 500px; margin: auto; animation: fadeIn 0.5s ease-out; }

@keyframes fadeIn { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: translateY(0); } }

/* Header Architecture */
.main-header {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    padding: 30px 20px;
    border-radius: var(--radius) var(--radius) 20px 20px;
    text-align: center;
    color: white;
    position: relative;
    overflow: hidden;
    box-shadow: 0 10px 25px rgba(198, 40, 40, 0.2);
}

.logo { width: 50px; height: auto; position: relative; z-index: 2; margin-bottom: 10px; }
.main-header h1 { font-size: 20px; margin: 0; position: relative; z-index: 2; }
.en-sub-header { font-size: 10px; letter-spacing: 2px; opacity: 0.8; margin-top: 4px; }

/* Cards Styling */
.card {
    background: white;
    margin-top: 15px;
    padding: 20px;
    border-radius: var(--radius);
    border: 1px solid var(--border);
    transition: 0.3s;
}

.card:focus-within { border-color: var(--primary); box-shadow: 0 0 0 3px rgba(198, 40, 40, 0.05); }

.info-card { border-top: 6px solid var(--primary); }
.description { font-size: 14px; line-height: 1.6; text-align: center; color: var(--text-light); }

.label-heading { font-weight: 700; font-size: 15px; display: block; margin-bottom: 15px; }

/* Branch Selector Grid */
.branch-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.branch-grid input { display: none; }
.branch-tile {
    border: 2px solid var(--border);
    padding: 15px;
    border-radius: 10px;
    text-align: center;
    cursor: pointer;
    transition: 0.2s;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
}

.branch-grid input:checked + .branch-tile {
    border-color: var(--primary);
    background: var(--accent);
    color: var(--primary);
}

/* Modern Input Field */
.modern-input {
    display: flex;
    align-items: center;
    background: #f9fafb;
    padding: 12px 15px;
    border-radius: 8px;
}
.modern-input i { color: var(--text-light); margin-left: 12px; width: 18px; }
.modern-input input { border: none; background: transparent; width: 100%; font-size: 16px; outline: none; }

/* Footer Actions */
.actions { margin-top: 30px; padding-bottom: 40px; }
.submit-btn {
    width: 100%; padding: 20px; background: var(--primary); color: white;
    border: none; border-radius: 15px; font-size: 18px; font-weight: 700;
    cursor: pointer; box-shadow: 0 8px 20px rgba(198, 40, 40, 0.3);
    transition: 0.3s; position: relative;
}
.submit-btn:active { transform: scale(0.97); }

/* Modal Styles */
.modal-overlay {
    position: fixed; top: 0; left: 0; width: 100%; height: 100%;
    background: rgba(0,0,0,0.7); z-index: 1000;
    display: flex; align-items: center; justify-content: center;
    backdrop-filter: blur(5px);
}
.modal-content {
    background: white; padding: 30px; border-radius: 20px; width: 90%; max-width: 400px;
    text-align: center; box-shadow: 0 20px 40px rgba(0,0,0,0.3);
}
.modal-loader {
    width: 40px; height: 40px; border: 4px solid #f3f3f3;
    border-top: 4px solid var(--primary); border-radius: 50%;
    margin: 20px auto; animation: spin 1s linear infinite;
}
@keyframes spin { 0% { transform: rotate(0deg); } 100% { transform: rotate(360deg); } }
.modal-btn {
    margin-top: 20px; padding: 12px 30px; background: var(--primary);
    color: white; border: none; border-radius: 10px; font-weight: 700; cursor: pointer;
}
.success-icon { color: #4caf50; width: 60px; height: 60px; margin-bottom: 15px; }
.error-icon { color: #f44336; width: 60px; height: 60px; margin-bottom: 15px; }

/* Back Navigation */
.back-nav { max-width: 500px; margin: 10px auto; padding: 0 5px; }
.back-btn {
    display: inline-flex; align-items: center; gap: 8px; text-decoration: none;
    color: var(--text-light); font-size: 0.9rem; padding: 8px 12px;
    border-radius: var(--radius); transition: all 0.3s ease;
    background: white; border: 1px solid var(--border);
}
.back-btn:hover { color: var(--primary); border-color: var(--primary); background: var(--accent); transform: translateX(-5px); }

/* Developer Footer */
.developer-footer { margin-top: 50px; padding: 20px 10px; border-top: 1px solid var(--border); }
.dev-card { background: white; border-radius: var(--radius); padding: 15px; border: 1px solid var(--border); }
.dev-header { display: flex; align-items: center; gap: 8px; margin-bottom: 10px; color: var(--primary); }
.version-badge { background: #f3f4f6; padding: 4px 8px; border-radius: 6px; font-size: 11px; }

.hidden { display: none !important; }
.required { color: var(--primary); }