{{-- Modal Backdrop --}}
<div id="examScheduleModal" class="fixed inset-0 z-[100] hidden bg-slate-900/60 backdrop-blur-sm transition-all duration-300 !mt-0">
    <div class="flex items-center justify-center min-h-screen px-4 pt-4 pb-20 text-center sm:p-0">
        
        {{-- Modal Content --}}
        <div class="relative w-full max-w-lg bg-white/95 backdrop-blur-md rounded-3xl shadow-[0_20px_50px_-12px_rgba(0,0,0,0.2)] ring-1 ring-slate-900/5 text-left overflow-hidden transform transition-all duration-300">
            
            {{-- Header --}}
            <div class="px-6 py-5 border-b border-slate-100/80 flex items-center justify-between bg-gradient-to-b from-slate-50/80 to-white">
                <div class="flex items-center gap-3">
                    <div class="p-2 bg-gradient-to-br from-blue-100 to-indigo-50 text-blue-600 rounded-xl shadow-sm ring-1 ring-blue-500/10">
                        <i data-lucide="calendar-plus" class="w-5 h-5"></i>
                    </div>
                    <h3 id="modal_title" class="text-xl font-extrabold text-slate-800 tracking-tight">Tạo lịch thi</h3>
                </div>
                <button type="button" class="btn-close-exam-schedule-modal text-slate-400 hover:text-rose-600 hover:bg-rose-50 p-2 rounded-xl transition-all duration-300 hover:rotate-90 active:scale-90">
                    <i data-lucide="x" class="w-5 h-5"></i>
                </button>
            </div>

            <form id="modal_form_exam_schedule" novalidate>
                {{-- Body Form --}}
                <div class="px-6 py-6 space-y-6">
                    
                    {{-- Field: Mã HV --}}
                    <div class="space-y-1.5">
                        <label class="block text-[13px] font-bold text-slate-500 uppercase tracking-wider">
                            Học Viên <span class="text-rose-500">*</span>
                        </label>
                        {{-- Thẻ select của bạn sẽ được JS render, mình bọc ngoài bằng div để tạo khoảng cách đẹp hơn --}}
                        <div class="relative transition-all duration-200">
                            <select id="modal_student_id" placeholder="Gõ để tìm kiếm học viên..."></select>
                        </div>
                        <div id="error_student_id" class="text-sm font-medium"></div>
                    </div>

                    {{-- Field: Khóa học --}}
                    <div class="space-y-1.5">
                        <label class="block text-[13px] font-bold text-slate-500 uppercase tracking-wider">
                            Khóa Học <span class="text-rose-500">*</span>
                        </label>
                        <div class="relative transition-all duration-200">
                            <select id="modal_course" placeholder="Gõ để tìm khóa học..."></select>
                        </div>
                        <div id="error_course" class="text-sm font-medium"></div>
                    </div>

                    {{-- Field: Bài thi --}}
                    <div class="space-y-1.5">
                        <label class="block text-[13px] font-bold text-slate-500 uppercase tracking-wider">
                            Bài thi <span class="text-rose-500">*</span>
                        </label>
                        <div class="relative transition-all duration-200">
                            <select id="modal_exam" placeholder="Gõ để tìm bài thi..."></select>
                        </div>
                        <div id="error_exam" class="text-sm font-medium"></div>
                    </div>

                    {{-- Field: Yêu cầu (Modern Radio Cards) --}}
                    <div class="space-y-2">
                        <label class="block text-[13px] font-bold text-slate-500 uppercase tracking-wider">
                            Phân loại yêu cầu <span class="text-rose-500">*</span>
                        </label>
                        
                        <div id="modal_requirement_group" class="relative p-1 bg-slate-100/80 rounded-2xl flex items-center w-full overflow-hidden border border-slate-200">
                            {{-- Thanh trượt (Sliding background) --}}
                            <div class="absolute inset-y-1 left-1 w-[calc(50%-4px)] bg-white rounded-[14px] shadow-md transition-transform duration-300 ease-out transform" id="capsule_indicator"></div>

                            {{-- Option: Thi lại --}}
                            <label class="relative flex-1 cursor-pointer z-10">
                                <input type="radio" name="modal_requirement" value="1" class="peer sr-only">
                                <div class="py-3 flex flex-col items-center justify-center transition-all duration-300 peer-checked:text-blue-600 text-slate-500 hover:text-slate-700">
                                    <div class="flex items-center gap-2">
                                        <i data-lucide="rotate-ccw" class="w-4 h-4 transition-transform duration-300 peer-checked:scale-110"></i>
                                        <span class="font-bold text-sm tracking-tight">Thi lại</span>
                                    </div>
                                </div>
                            </label>

                            {{-- Option: Thi sớm --}}
                            <label class="relative flex-1 cursor-pointer z-10">
                                <input type="radio" name="modal_requirement" value="2" class="peer sr-only">
                                <div class="py-3 flex flex-col items-center justify-center transition-all duration-300 peer-checked:text-emerald-600 text-slate-500 hover:text-slate-700">
                                    <div class="flex items-center gap-2">
                                        <i data-lucide="zap" class="w-4 h-4 transition-transform duration-300 peer-checked:scale-110"></i>
                                        <span class="font-bold text-sm tracking-tight">Thi sớm</span>
                                    </div>
                                </div>
                            </label>
                        </div>
                        <div id="error_requirement" class="text-sm font-medium"></div>
                    </div>

                    {{-- Field: Thời gian thi --}}
                    <div class="grid grid-cols-1 md:grid-cols-2 gap-4">
                        <div class="space-y-1.5">
                            <label class="block text-[13px] font-bold text-slate-500 uppercase tracking-wider">
                                Ngày bắt đầu <span class="text-rose-500">*</span>
                            </label>
                            <div class="relative transition-all duration-200">
                                <i data-lucide="calendar" class="w-4 h-4 absolute left-3 top-1/2 -translate-y-1/2 text-slate-400 z-10"></i>
                                <input type="text" id="modal_start_date" class="w-full pl-9 pr-3 py-2.5 border border-slate-300 rounded-xl text-sm bg-white focus:ring-2 focus:ring-blue-100 focus:border-blue-500 transition-all shadow-sm" placeholder="Chọn ngày bắt đầu...">
                            </div>
                            <div id="error_start_date" class="text-sm font-medium"></div>
                        </div>

                        <div class="space-y-1.5">
                            <label class="block text-[13px] font-bold text-slate-500 uppercase tracking-wider">
                                Ngày kết thúc <span class="text-rose-500">*</span>
                            </label>
                            <div class="relative transition-all duration-200">
                                <i data-lucide="calendar" class="w-4 h-4 absolute left-3 top-1/2 -translate-y-1/2 text-slate-400 z-10"></i>
                                <input type="text" id="modal_end_date" class="w-full pl-9 pr-3 py-2.5 border border-slate-200 rounded-xl text-sm bg-slate-50 text-slate-500 cursor-not-allowed shadow-sm" readonly placeholder="Tự động tính (+3 ngày)...">
                            </div>
                            <div id="error_end_date" class="text-sm font-medium"></div>
                        </div>
                    </div>

                    {{-- Info Box --}}
                    <div id="modal_backup_warning" class="hidden overflow-hidden bg-gradient-to-r from-amber-50 to-orange-50/30 border border-amber-200 border-l-4 border-l-amber-500 rounded-xl shadow-sm">
                        <div class="flex items-start gap-3 p-4">
                            <i data-lucide="info" class="w-5 h-5 text-amber-500 mt-0.5 shrink-0 animate-pulse"></i>
                            <p class="text-[13px] text-amber-800 leading-relaxed">
                                <span class="font-bold block mb-1 text-amber-900">Lưu ý nghiệp vụ:</span>
                                Vì đây là lượt order thủ công (hoặc lượt 2), trạng thái bài thi sẽ được hệ thống tự động đánh dấu là <span class="inline-flex items-center px-2 py-0.5 rounded text-xs font-bold bg-amber-200 text-amber-900 ml-1">Backup</span>.
                            </p>
                        </div>
                    </div>

                </div>

                {{-- Footer Actions --}}
                <div class="px-6 py-5 bg-slate-50/80 border-t border-slate-100 flex items-center justify-end gap-3 rounded-b-3xl">
                    <button type="button" class="btn-close-exam-schedule-modal px-5 py-2.5 text-sm font-semibold text-slate-600 bg-white border border-slate-300 rounded-xl shadow-sm hover:bg-slate-50 hover:text-slate-800 active:scale-95 transition-all duration-200">
                        Hủy bỏ
                    </button>
                    {{-- Nút Submit form --}}
                    <button id="btn_save_modal" class="px-6 py-2.5 text-sm font-bold text-white bg-gradient-to-r from-blue-600 to-indigo-600 border border-transparent rounded-xl shadow-lg shadow-blue-500/30 hover:shadow-blue-500/50 hover:from-blue-700 hover:to-indigo-700 hover:-translate-y-0.5 active:scale-95 transition-all duration-200 flex items-center gap-2">
                        <i data-lucide="save" class="w-4 h-4"></i>
                        <span>Lưu thông tin</span>
                    </button>
                </div>
            </form>
            
        </div>
    </div>
</div>