{{-- Extend Deadline Modal --}}
<div id="extendDeadlineModal" 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-emerald-100 to-teal-50 text-emerald-600 rounded-xl shadow-sm ring-1 ring-emerald-500/10">
                        <i data-lucide="clock" class="w-5 h-5"></i>
                    </div>
                    <h3 class="text-xl font-extrabold text-slate-800 tracking-tight">Gia hạn lịch thi</h3>
                </div>
                <button type="button" class="btn-close-extend-deadline-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_extend_deadline" novalidate>
                {{-- Body Form --}}
                <div class="px-6 py-6 space-y-6">
                    
                    {{-- Student/Course/Exam Info Cards --}}
                    <div class="bg-slate-50/80 rounded-2xl p-4 border border-slate-100 space-y-3.5">
                        <div class="flex justify-between items-start gap-4">
                            <div>
                                <span class="block text-[11px] font-bold text-slate-400 uppercase tracking-wider">Học viên</span>
                                <span id="extend_student_info" class="text-sm font-bold text-slate-700">N/A</span>
                            </div>
                            <span id="extend_student_code" class="text-[12px] font-mono font-bold text-blue-700 bg-blue-50 px-2 py-0.5 rounded border border-blue-200">N/A</span>
                        </div>
                        
                        <div class="h-[1px] bg-slate-200/60"></div>
                        
                        <div>
                            <span class="block text-[11px] font-bold text-slate-400 uppercase tracking-wider">Khóa học</span>
                            <span id="extend_course_info" class="text-sm font-semibold text-slate-700">N/A</span>
                        </div>

                        <div class="h-[1px] bg-slate-200/60"></div>

                        <div>
                            <span class="block text-[11px] font-bold text-slate-400 uppercase tracking-wider">Bài thi</span>
                            <span id="extend_exam_info" class="text-sm font-bold text-slate-800">N/A</span>
                        </div>

                        <div class="h-[1px] bg-slate-200/60"></div>

                        <div>
                            <span class="block text-[11px] font-bold text-slate-400 uppercase tracking-wider">Hạn đóng hiện tại</span>
                            <span id="extend_current_deadline" class="text-sm font-bold text-rose-600">N/A</span>
                        </div>
                    </div>

                    {{-- Field: Hạn đóng mới --}}
                    <div class="space-y-1.5">
                        <label class="block text-[13px] font-bold text-slate-500 uppercase tracking-wider">
                            Hạn đóng mới <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_extend_deadline" 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 thời gian gia hạn...">
                        </div>
                        <div id="error_extend_deadline" class="text-sm font-medium text-rose-500"></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-extend-deadline-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 --}}
                    <button id="btn_save_extend_modal" class="px-6 py-2.5 text-sm font-bold text-white bg-gradient-to-r from-emerald-600 to-teal-600 border border-transparent rounded-xl shadow-lg shadow-emerald-500/30 hover:shadow-emerald-500/50 hover:from-emerald-700 hover:to-teal-700 hover:-translate-y-0.5 active:scale-95 transition-all duration-200 flex items-center gap-2">
                        <i data-lucide="check-circle" class="w-4 h-4"></i>
                        <span>Xác nhận gia hạn</span>
                    </button>
                </div>
            </form>
            
        </div>
    </div>
</div>