/* ===== RESET & BASE ===== */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{font-size:16px;scroll-behavior:smooth}
body{font-family:'Inter',-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,sans-serif;color:#1F2937;background:#F5F5FA;-webkit-font-smoothing:antialiased;line-height:1.5}
button{font-family:inherit;cursor:pointer;border:none;background:none}
input,select,textarea{font-family:inherit;font-size:1rem}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}

:root{
  --purple-50:#F5F3FF;
  --purple-100:#EDE9FE;
  --purple-200:#DDD6FE;
  --purple-300:#C4B5FD;
  --purple-400:#A78BFA;
  --purple-500:#8B5CF6;
  --purple-600:#7C3AED;
  --purple-700:#6D28D9;
  --purple-800:#5B21B6;
  --purple-900:#4C1D95;
  --white:#FFFFFF;
  --gray-50:#F9FAFB;
  --gray-100:#F3F4F6;
  --gray-200:#E5E7EB;
  --gray-300:#D1D5DB;
  --gray-400:#9CA3AF;
  --gray-500:#6B7280;
  --gray-600:#4B5563;
  --gray-700:#374151;
  --gray-800:#1F2937;
  --gray-900:#111827;
  --danger:#EF4444;
  --success:#10B981;
  --warning:#F59E0B;
  --shadow-sm:0 1px 2px rgba(0,0,0,.05);
  --shadow-md:0 4px 6px -1px rgba(0,0,0,.08),0 2px 4px -1px rgba(0,0,0,.04);
  --shadow-lg:0 10px 15px -3px rgba(0,0,0,.08),0 4px 6px -2px rgba(0,0,0,.03);
  --shadow-xl:0 20px 25px -5px rgba(124,58,237,.12),0 10px 10px -5px rgba(124,58,237,.06);
  --radius-sm:8px;
  --radius-md:12px;
  --radius-lg:16px;
  --radius-xl:20px;
  --radius-full:9999px;
  --transition:all .2s ease;
}

/* ===== AUTH PAGE ===== */
.auth-body{min-height:100vh;display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,#667eea 0%,#764ba2 100%);padding:20px}
.auth-container{width:100%;max-width:440px;animation:fadeInUp .5s ease}
.auth-card{background:var(--white);border-radius:var(--radius-xl);padding:40px;box-shadow:var(--shadow-xl)}
.auth-logo{text-align:center;margin-bottom:32px}
.logo-badge{width:64px;height:64px;margin:0 auto 16px;background:linear-gradient(135deg,var(--purple-600),var(--purple-800));border-radius:var(--radius-md);display:flex;align-items:center;justify-content:center;color:var(--white);font-size:32px;font-weight:800;box-shadow:0 8px 20px rgba(124,58,237,.35)}
.logo-badge.sm{width:40px;height:40px;font-size:20px;margin:0}
.auth-card h1{font-size:28px;font-weight:800;color:var(--gray-900)}
.auth-subtitle{color:var(--gray-500);margin-top:4px;font-size:14px}
.auth-form{display:flex;flex-direction:column;gap:18px}
.auth-footer{text-align:center;margin-top:24px;color:var(--gray-400)}

/* ===== FORMS ===== */
.form-group{display:flex;flex-direction:column;gap:6px}
.form-group label{font-size:13px;font-weight:600;color:var(--gray-700)}
.form-group input,.form-group select,.form-group textarea{padding:12px 14px;border:1.5px solid var(--gray-200);border-radius:var(--radius-md);background:var(--white);transition:var(--transition);outline:none}
.form-group input:focus,.form-group select:focus,.form-group textarea:focus{border-color:var(--purple-500);box-shadow:0 0 0 4px rgba(139,92,246,.12)}
.form-group input.error{border-color:var(--danger)}

/* ===== BUTTONS ===== */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:12px 20px;border-radius:var(--radius-md);font-weight:600;font-size:14px;transition:var(--transition);white-space:nowrap;height:44px}
.btn svg{width:18px;height:18px}
.btn-primary{background:var(--purple-600);color:var(--white)}
.btn-primary:hover:not(:disabled){background:var(--purple-700);transform:translateY(-1px);box-shadow:var(--shadow-md)}
.btn-primary:disabled{opacity:.6;cursor:not-allowed;transform:none}
.btn-ghost{background:var(--gray-100);color:var(--gray-700)}
.btn-ghost:hover{background:var(--gray-200)}
.btn-block{width:100%}

/* ===== APP LAYOUT ===== */
.app-body{display:flex;min-height:100vh;background:var(--gray-50)}
.sidebar{width:240px;background:var(--white);border-right:1px solid var(--gray-200);display:flex;flex-direction:column;position:fixed;top:0;left:0;bottom:0;z-index:100;transition:transform .3s ease}
.sidebar-header{padding:20px;display:flex;align-items:center;gap:10px;border-bottom:1px solid var(--gray-100)}
.logo-text{font-weight:800;font-size:18px;color:var(--gray-900)}
.sidebar-nav{flex:1;padding:16px 12px;display:flex;flex-direction:column;gap:4px}
.nav-item{display:flex;align-items:center;gap:12px;padding:12px 14px;border-radius:var(--radius-md);color:var(--gray-600);font-weight:500;transition:var(--transition);cursor:pointer}
.nav-item:hover{background:var(--gray-50);color:var(--purple-600)}
.nav-item.active{background:linear-gradient(135deg,var(--purple-600),var(--purple-700));color:var(--white);box-shadow:0 4px 12px rgba(124,58,237,.25)}
.nav-item svg{width:20px;height:20px}
.sidebar-footer{padding:12px;border-top:1px solid var(--gray-100)}
.btn-logout{width:100%;display:flex;align-items:center;gap:12px;padding:12px 14px;border-radius:var(--radius-md);color:var(--gray-600);font-weight:500;transition:var(--transition)}
.btn-logout:hover{background:var(--danger);color:var(--white)}
.btn-logout svg{width:20px;height:20px}

.main-content{flex:1;margin-left:240px;display:flex;flex-direction:column;min-width:0}
.topbar{height:72px;background:var(--white);border-bottom:1px solid var(--gray-200);padding:0 24px;display:flex;align-items:center;gap:16px;position:sticky;top:0;z-index:50}
.topbar-title{font-size:20px;font-weight:700;color:var(--gray-900);flex:1}
.topbar-user{display:flex;align-items:center;gap:10px}
.avatar{width:40px;height:40px;border-radius:var(--radius-full);background:linear-gradient(135deg,var(--purple-500),var(--purple-700));color:var(--white);display:flex;align-items:center;justify-content:center;font-weight:700}
.user-email{color:var(--gray-600);font-size:14px}
.menu-toggle{display:none;width:40px;height:40px;align-items:center;justify-content:center;border-radius:var(--radius-md)}
.menu-toggle:hover{background:var(--gray-100)}
.menu-toggle svg{width:22px;height:22px}

/* ===== VIEWS ===== */
.view{display:none;padding:24px;animation:fadeIn .3s ease;flex:1}
.view.active{display:block}
.panel{background:var(--white);border-radius:var(--radius-lg);padding:24px;box-shadow:var(--shadow-sm);margin-top:20px}
.panel-header{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:16px;margin-bottom:20px}
.panel-header h2{font-size:18px;font-weight:700;color:var(--gray-900)}

/* ===== STATS ===== */
.stats-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:16px}
.stat-card{background:var(--white);border-radius:var(--radius-lg);padding:20px;box-shadow:var(--shadow-sm);display:flex;align-items:center;gap:16px;transition:var(--transition)}
.stat-card:hover{transform:translateY(-2px);box-shadow:var(--shadow-md)}
.stat-icon{width:56px;height:56px;border-radius:var(--radius-md);background:var(--purple-50);color:var(--purple-600);display:flex;align-items:center;justify-content:center;flex-shrink:0}
.stat-icon svg{width:28px;height:28px}
.stat-icon.accent{background:linear-gradient(135deg,var(--purple-500),var(--purple-700));color:var(--white)}
.stat-icon.soft{background:var(--purple-100);color:var(--purple-700)}
.stat-label{color:var(--gray-500);font-size:13px;font-weight:500}
.stat-value{font-size:24px;font-weight:800;color:var(--gray-900);margin-top:2px}

/* ===== PROJECTS GRID ===== */
.projects-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:18px}
.project-card{background:var(--white);border-radius:var(--radius-lg);overflow:hidden;box-shadow:var(--shadow-sm);transition:var(--transition);cursor:pointer;border:1px solid var(--gray-100)}
.project-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg);border-color:var(--purple-200)}
.project-img{width:100%;height:160px;object-fit:cover;background:var(--gray-100)}
.project-body{padding:16px}
.project-body h3{font-size:16px;font-weight:700;color:var(--gray-900);margin-bottom:8px}
.project-meta{display:flex;flex-direction:column;gap:4px;color:var(--gray-500);font-size:13px;margin-bottom:12px}
.project-meta strong{color:var(--gray-700)}
.project-receipt-count{display:inline-flex;align-items:center;gap:6px;padding:6px 10px;background:var(--purple-50);color:var(--purple-700);border-radius:var(--radius-full);font-size:12px;font-weight:600}
.project-receipt-count svg{width:14px;height:14px}

/* ===== RECEIPTS GRID ===== */
.receipts-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:16px}
.receipt-card{background:var(--white);border-radius:var(--radius-lg);overflow:hidden;box-shadow:var(--shadow-sm);cursor:pointer;transition:var(--transition);border:1px solid var(--gray-100)}
.receipt-card:hover{transform:translateY(-3px);box-shadow:var(--shadow-md);border-color:var(--purple-200)}
.receipt-img{width:100%;height:140px;object-fit:cover;background:var(--gray-100)}
.receipt-body{padding:14px}
.receipt-body h4{font-size:14px;font-weight:600;color:var(--gray-900);margin-bottom:4px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.receipt-amount{font-size:18px;font-weight:800;color:var(--purple-700);margin-bottom:4px}
.receipt-date{font-size:12px;color:var(--gray-400)}

/* ===== PROJECT HERO (detail page) ===== */
.project-hero{position:relative;height:220px;border-radius:var(--radius-lg);overflow:hidden;margin-bottom:20px}
.project-hero-bg{position:absolute;inset:0;background-size:cover;background-position:center}
.project-hero-bg::after{content:"";position:absolute;inset:0;background:linear-gradient(to bottom,rgba(0,0,0,.3),rgba(0,0,0,.75))}
.project-hero-content{position:relative;z-index:1;padding:24px;height:100%;display:flex;flex-direction:column;justify-content:flex-end;color:var(--white)}
.project-hero-content h1{font-size:28px;font-weight:800;margin-bottom:8px}
.project-hero-content .project-meta{flex-direction:row;gap:16px;color:rgba(255,255,255,.9);flex-wrap:wrap}
.back-link{display:inline-flex;align-items:center;gap:6px;color:rgba(255,255,255,.9);font-weight:500;margin-bottom:12px;font-size:14px}
.back-link:hover{color:var(--white)}
.back-link svg{width:16px;height:16px}

/* ===== CUSTOM SELECT ===== */
.custom-select{position:relative}
.custom-select-trigger{display:flex;align-items:center;justify-content:space-between;padding:12px 14px;border:1.5px solid var(--gray-200);border-radius:var(--radius-md);background:var(--white);cursor:pointer;min-height:56px;transition:var(--transition);gap:10px}
.custom-select-trigger:hover{border-color:var(--purple-300)}
.custom-select-trigger.open{border-color:var(--purple-500);box-shadow:0 0 0 4px rgba(139,92,246,.12)}
.custom-select-trigger svg{width:20px;height:20px;color:var(--gray-400);transition:transform .2s}
.custom-select-trigger.open svg{transform:rotate(180deg)}
.select-placeholder{color:var(--gray-400)}
.selected-project{display:flex;align-items:center;gap:12px}
.selected-project img{width:44px;height:44px;border-radius:var(--radius-md);object-fit:cover}
.selected-project span{font-weight:600;color:var(--gray-800)}
.custom-select-menu{position:absolute;top:calc(100% + 6px);left:0;right:0;background:var(--white);border:1px solid var(--gray-200);border-radius:var(--radius-md);box-shadow:var(--shadow-lg);max-height:280px;overflow-y:auto;z-index:100;display:none;animation:slideDown .2s ease}
.custom-select-menu.open{display:block}
.custom-select-option{display:flex;align-items:center;gap:12px;padding:10px 14px;cursor:pointer;transition:var(--transition)}
.custom-select-option:hover{background:var(--purple-50)}
.custom-select-option.selected{background:var(--purple-100)}
.custom-select-option img{width:40px;height:40px;border-radius:var(--radius-md);object-fit:cover}
.custom-select-option span{font-weight:500;color:var(--gray-800)}

/* ===== MODALS ===== */
.modal-overlay{position:fixed;inset:0;background:rgba(17,24,39,.6);display:none;align-items:center;justify-content:center;z-index:1000;padding:20px;backdrop-filter:blur(4px);overflow-y:auto}
.modal-overlay.active{display:flex;animation:fadeIn .2s ease}
.modal{background:var(--white);border-radius:var(--radius-xl);max-width:500px;width:100%;box-shadow:var(--shadow-xl);animation:scaleIn .3s ease;max-height:90vh;display:flex;flex-direction:column}
.modal.modal-lg{max-width:600px}
.modal-header{display:flex;justify-content:space-between;align-items:center;padding:20px 24px;border-bottom:1px solid var(--gray-100)}
.modal-header h3{font-size:18px;font-weight:700}
.modal-close{width:32px;height:32px;border-radius:var(--radius-full);color:var(--gray-500);font-size:24px;display:flex;align-items:center;justify-content:center;transition:var(--transition)}
.modal-close:hover{background:var(--gray-100);color:var(--gray-900)}
.modal-body{padding:24px;flex:1;overflow-y:auto;display:flex;flex-direction:column;gap:16px}
.modal-footer{display:flex;justify-content:flex-end;gap:10px;margin-top:8px}

/* ===== STEPS ===== */
.steps{display:flex;justify-content:space-between;padding:20px 24px;background:var(--gray-50);border-bottom:1px solid var(--gray-100)}
.step{display:flex;align-items:center;gap:8px;flex:1;opacity:.4;transition:var(--transition);min-width:0}
.step.active{opacity:1}
.step.completed{opacity:.7}
.step-num{width:28px;height:28px;border-radius:var(--radius-full);background:var(--gray-200);color:var(--gray-600);display:flex;align-items:center;justify-content:center;font-weight:700;font-size:13px;flex-shrink:0}
.step.active .step-num{background:var(--purple-600);color:var(--white)}
.step.completed .step-num{background:var(--success);color:var(--white)}
.step span{font-size:13px;font-weight:500;color:var(--gray-700);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}

.receipt-step{display:none;flex-direction:column;gap:14px}
.receipt-step.active{display:flex;animation:fadeIn .3s ease}
.step-label{font-weight:600;color:var(--gray-800)}

/* ===== IMAGE UPLOAD ===== */
.img-upload{position:relative;width:100%;height:160px;border:2px dashed var(--gray-300);border-radius:var(--radius-md);overflow:hidden;cursor:pointer;transition:var(--transition);background:var(--gray-50);display:flex;align-items:center;justify-content:center}
.img-upload.large{height:220px}
.img-upload:hover{border-color:var(--purple-400);background:var(--purple-50)}
.img-upload.has-image{border-style:solid;border-color:var(--purple-500)}
.upload-placeholder{display:flex;flex-direction:column;align-items:center;gap:8px;color:var(--gray-500)}
.upload-placeholder svg{width:36px;height:36px}
.img-preview{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}
.file-input{position:absolute;inset:0;opacity:0;cursor:pointer}

/* ===== UPLOAD PROGRESS ===== */
.upload-progress{margin-top:12px}
.progress-bar{height:8px;background:var(--gray-200);border-radius:var(--radius-full);overflow:hidden}
.progress-fill{height:100%;background:linear-gradient(90deg,var(--purple-500),var(--purple-700));width:0%;transition:width .3s ease;border-radius:var(--radius-full)}
.progress-text{font-size:12px;color:var(--gray-600);margin-top:6px;display:block;font-weight:600}

/* ===== LIGHTBOX ===== */
.lightbox{position:fixed;inset:0;background:rgba(17,24,39,.95);display:none;align-items:center;justify-content:center;z-index:2000;padding:20px;backdrop-filter:blur(6px)}
.lightbox.active{display:flex;animation:fadeIn .2s ease}
.lightbox img{max-width:95%;max-height:95vh;border-radius:var(--radius-md);box-shadow:0 20px 60px rgba(0,0,0,.5)}
.lightbox-close{position:fixed;top:20px;right:20px;width:48px;height:48px;border-radius:var(--radius-full);background:var(--white);color:var(--gray-900);font-size:28px;display:flex;align-items:center;justify-content:center;box-shadow:var(--shadow-lg);z-index:10}
.lightbox-close:hover{background:var(--gray-100)}

/* ===== TOAST ===== */
.toast-container{position:fixed;top:20px;right:20px;z-index:3000;display:flex;flex-direction:column;gap:10px;max-width:360px}
.toast{background:var(--white);border-radius:var(--radius-md);padding:14px 16px;box-shadow:var(--shadow-lg);display:flex;align-items:flex-start;gap:10px;animation:slideInRight .3s ease;border-left:4px solid var(--purple-500);min-width:260px}
.toast.success{border-left-color:var(--success)}
.toast.error{border-left-color:var(--danger)}
.toast.warning{border-left-color:var(--warning)}
.toast-icon{width:22px;height:22px;flex-shrink:0;margin-top:1px}
.toast.success .toast-icon{color:var(--success)}
.toast.error .toast-icon{color:var(--danger)}
.toast.warning .toast-icon{color:var(--warning)}
.toast:not(.success):not(.error):not(.warning) .toast-icon{color:var(--purple-600)}
.toast-body{flex:1;min-width:0}
.toast-title{font-weight:700;font-size:14px;color:var(--gray-900)}
.toast-msg{font-size:13px;color:var(--gray-600);margin-top:2px}

/* ===== UTILITIES ===== */
.hidden{display:none !important}
.empty{text-align:center;padding:48px 20px;color:var(--gray-400)}
.empty svg{width:48px;height:48px;margin:0 auto 12px;opacity:.5}
.empty h3{color:var(--gray-600);margin-bottom:4px}

/* Spinner */
.spinner{width:18px;height:18px;border:2.5px solid rgba(255,255,255,.3);border-top-color:var(--white);border-radius:50%;animation:spin .8s linear infinite}
.btn-loader{display:flex;align-items:center}

/* Skeleton */
.skeleton{background:linear-gradient(90deg,var(--gray-100) 25%,var(--gray-200) 50%,var(--gray-100) 75%);background-size:200% 100%;animation:skeletonShimmer 1.4s ease-in-out infinite;border-radius:var(--radius-md)}
.skeleton-card{height:240px}

/* ===== ANIMATIONS ===== */
@keyframes fadeIn{from{opacity:0}to{opacity:1}}
@keyframes fadeInUp{from{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}
@keyframes scaleIn{from{opacity:0;transform:scale(.95)}to{opacity:1;transform:scale(1)}}
@keyframes slideDown{from{opacity:0;transform:translateY(-8px)}to{opacity:1;transform:translateY(0)}}
@keyframes slideInRight{from{opacity:0;transform:translateX(100%)}to{opacity:1;transform:translateX(0)}}
@keyframes spin{to{transform:rotate(360deg)}}
@keyframes skeletonShimmer{0%{background-position:200% 0}100%{background-position:-200% 0}}

/* ===== RESPONSIVE ===== */
@media (max-width:900px){
  .sidebar{transform:translateX(-100%)}
  .sidebar.open{transform:translateX(0);box-shadow:0 0 40px rgba(0,0,0,.2)}
  .main-content{margin-left:0}
  .menu-toggle{display:flex}
}
@media (max-width:600px){
  .view{padding:16px}
  .panel{padding:18px}
  .topbar{padding:0 16px}
  .auth-card{padding:28px 22px}
  .user-email{display:none}
  .steps{padding:14px}
  .step span{display:none}
  .stat-value{font-size:20px}
  .stat-icon{width:48px;height:48px}
  .modal{max-height:95vh}
}