/* ============================================================
   🎨 DESIGN SYSTEM — OKLCH COMBINED & NORMALIZED
   Bao gồm: Variables, Base, Layout, Components, Forms, Modals, Utilities
   ============================================================ */

:root {
  /* =========================
     🌍 SURFACE & BACKGROUNDS
  ========================== */
  --background: oklch(0.979 0.003 264.542); 
  --foreground: oklch(0.116 0.031 257.085);
  
  --bg: var(--background);
  --card: oklch(1 0.001 0);
  --card-bg: oklch(1 0 0);
  --surface-bg: oklch(0.99 0.002 264);
  --muted-bg: oklch(0.965 0.004 264);
  
  --card-foreground: oklch(0.132 0.036 261.237);
  --popover: oklch(1 0.001 0);
  --popover-foreground: oklch(0.125 0.033 261.958);

  /* =========================
     🎯 BRAND COLORS
  ========================== */
  --primary: oklch(0.389 0.241 264.187);
  --primary-foreground: oklch(0.9856 0.0278 98.0540);
  --secondary: oklch(0.857 0.165 86.421);
  --secondary-foreground: oklch(0.2558 0.0433 268.0662);
  --accent: oklch(0.75 0.17 60); /* Màu Accent Vàng/Cam */
  --accent-foreground: oklch(0.9856 0.0278 98.0540);

  /* =========================
     📊 STATES & STATUS
  ========================== */
/*  
  --success: oklch(0.72 0.16 142);
  --warning: oklch(0.85 0.17 85);
  --danger: oklch(0.629 0.195 33.29);
  --info: oklch(0.65 0.15 240);
*/
  --success: oklch(0.627 0.165 142.89);
  --warning: oklch(0.729 0.168 62.6);
  --danger: oklch(0.621 0.212 26.51);
  --info: oklch(0.537 0.144 243.64);
  
  /* =========================
     🧩 NEUTRAL & BORDERS
  ========================== */
  --muted: oklch(0.9202 0.0080 106.5563);
  --muted-foreground: oklch(0.4815 0.1178 263.3758);
  --border: oklch(0.871 0.018 248.03);
  --input: oklch(1 0.001 0);
  --ring: var(--primary);

  /* =========================
     🔁 LEGACY MAP & ALIASES
  ========================== */
  --primary-color: var(--primary);
  --primary-dark: oklch(0.32 0.22 264);
  --primary-light: oklch(0.94 0.04 264);
  --primary-soft: color-mix(in oklch, var(--primary) 15%, transparent);

  --secondary-color: var(--secondary);
  --accent-color: var(--accent);
  --text-color: var(--foreground);
  --muted-color: var(--muted-foreground);
  --border-color: var(--border);

  --success-color: var(--success);
  --warning-color: var(--warning);
  --danger-color: var(--danger);
  --info-color: var(--info);

  --table-border-color: var(--border);
  --table-header-bg: oklch(0.622 0.194 24.5);
  --table-header-text: oklch(1 0 0);

  /* =========================
     🪄 LAYOUT, EFFECTS & TYPOGRAPHY
  ========================== */
  --container-max: 1280px;
  --header-height: 56px;
  --border-radius: 8px; /* Bo góc mềm mại cho button/card */
  --transition: all .3s cubic-bezier(.4,0,.2,1);

  --shadow-sm: 0 1px 3px color-mix(in oklab, black 10%, transparent);
  --shadow-md: 0 4px 12px color-mix(in oklab, black 15%, transparent);
  --shadow-lg: 0 10px 24px color-mix(in oklab, black 20%, transparent);
  --elevated-shadow: var(--shadow-lg);
  
  --overlay-bg: oklch(0 0 0 / 0.55);
  --focus-ring: 0 0 0 3px color-mix(in oklch, var(--primary) 35%, transparent);

  --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
/*--font-sans: 'Be Vietnam Pro', system-ui, sans-serif; */
  --font-base-size: 0.9rem;
  --font-size-xxs: calc(var(--font-base-size) * 0.65);
  --font-size-xs:  calc(var(--font-base-size) * 0.8);
  --font-size-sm:  calc(var(--font-base-size) * 0.875);
  --font-size-base: var(--font-base-size);
  --font-size-md:  calc(var(--font-base-size) * 1.125);
  --font-size-lg:  calc(var(--font-base-size) * 1.25);
  --font-size-xl:  calc(var(--font-base-size) * 1.563);
  --font-size-xxl: calc(var(--font-base-size) * 1.953);
  --font-size-xxxl:calc(var(--font-base-size) * 2.441);

  --line-height-tight: 1.2;
  --line-height-normal: 1.5;
  --line-height-loose: 1.75;
  --btn-height: 38px;
  
  --btn-height-xs: calc(var(--btn-height) * 0.50);
  --btn-height-sm: calc(var(--btn-height) * 0.75);
  --btn-height-lg: calc(var(--btn-height) * 1.25);
  --btn-height-xl: calc(var(--btn-height) * 1.5);

  /* Radius */
  --btn-radius: var(--border-radius);  
/* SIDEBAR (Màu xanh branding đậm nhưng clean thay vì xám đen) */
  --sidebar: oklch(0.38 0.09 200); 
  --sidebar-foreground: oklch(0.98 0 0); /* Chữ trắng */  
/* Tooltip */
  --tooltip-background: oklch(0.38 0.09 200); /* (Tone xanh dương đậm oklch(0.35 0.1 264);)*/
  --tooltip-foreground: oklch(0.98 0 0); /* Chữ trắng */  
  --tooltip-radius: 8px; 
}

/* =========================================================
   🌙 DARK MODE
   ========================================================= */
.dark, [data-theme="dark"] {
  --background: oklch(0.257 0.012 270.931);
  --bg: oklch(0.18 0.01 264);
  --muted-bg: oklch(0.22 0.01 264);
  --card-bg: oklch(0.24 0.01 264);
  --surface-bg: oklch(0.26 0.01 264);
  --card: oklch(0.295 0.018 258.369);
  --foreground: oklch(0.9366 0.0129 266.6974);
  --text-color: oklch(0.92 0.01 264);
  --muted: oklch(0.2424 0.0324 281.0890);
  --muted-foreground: oklch(0.6243 0.0412 262.0375);
  --muted-color: oklch(0.75 0.01 264);
  --border: oklch(0.359 0.019 264.308);
  --border-color: oklch(0.35 0.01 264);
  --input: oklch(0.436 0.049 265.123);
  --primary: oklch(0.599 0.219 260.24);
  --primary-color: oklch(0.65 0.17 264);
  --primary-soft: oklch(0.35 0.05 264);
  --accent-color: oklch(0.7 0.16 290);
  --success-color: oklch(0.75 0.15 150);
  --danger-color: oklch(0.65 0.2 25);
  --warning-color: oklch(0.8 0.15 85);
  --shadow-sm: 0 2px 6px oklch(0 0 0 / 0.25);
  --elevated-shadow: 0 10px 30px oklch(0 0 0 / 0.4);
  --focus-ring: 0 0 0 3px oklch(0.65 0.17 264 / 0.35);
}

/* =========================================================
   📏 BASE & RESET
   ========================================================= */
*, *::before, *::after { box-sizing: border-box; font-family: inherit; font-size: inherit; }
html { font-size: var(--font-base-size); }
body {
  font-family: var(--font-sans); font-size: var(--font-size-base);
  line-height: var(--line-height-normal); color: var(--foreground);
  background: var(--background); overflow-x: hidden; margin: 0;
}
h1{font-size:var(--font-size-xxxl);font-weight:800;color:var(--primary);}
h2{font-size:var(--font-size-xxl);font-weight:600;color:var(--primary);}
h3{font-size:var(--font-size-xl);font-weight:600;color:var(--foreground);}
h4{font-size:var(--font-size-lg);font-weight:600;color:var(--foreground);}
h5{font-size:var(--font-size-md);font-weight:500;color:var(--foreground);}
h6{font-size:var(--font-size-base);font-weight:500;color:var(--muted-foreground);}

@keyframes fadeIn { from { opacity:0; transform: translateY(10px); } to { opacity:1; transform:none; } }
.fade-in { animation: fadeIn .5s ease-out; }

/* =========================================================
   🏗️ LAYOUT
   ========================================================= */
.header {
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  color: #fff; padding: 1.25rem 0; margin-bottom: 1.125rem;
  box-shadow: var(--shadow-lg); position: relative; overflow: hidden;
  text-align: center; min-height: 120px; display: flex; align-items: center;
}
.header::after {
  content: ""; position: absolute; inset: auto 0 0 0; height: 4px;
  background: linear-gradient(90deg, var(--accent-color), rgba(234,88,12,.5)); z-index: 1;
}
.container { max-width: var(--container-max); width: 100%; margin: 0 auto; padding: 0 1rem; }
.content-section { padding: 3rem 0; }
.section-title { font-size: var(--font-size-xxl); color: var(--primary-color); text-align: center; margin-bottom: 2rem; position: relative; }
.section-title::after { content: ""; position: absolute; bottom: -.5rem; left: 50%; transform: translateX(-50%); width: 60px; height: 3px; background: var(--secondary-color); }
.footer { display: flex; gap: 12px; align-items: center; padding: 12px 14px; background: var(--card-bg); border-radius: 12px; box-shadow: var(--shadow-sm); }

/* =========================================================
   🖱️ BUTTONS (NÚT BẤM)
   ========================================================= */
.btn {
  height: var(--btn-height); padding: 0 1.25rem; border-radius: var(--border-radius);
  border: 1px solid var(--border-color); background: var(--card-bg); color: var(--text-color);
  font-size: var(--font-size-base); font-weight: 600; display: inline-flex; align-items: center;
  justify-content: center; gap: .5rem; cursor: pointer; transition: var(--transition); box-shadow: var(--shadow-sm);
}
/*.btn:hover {background: var(--muted-bg); color: var(--foreground); font-weight: 600; transform: translateY(-1.5px); box-shadow: 0 2px 6px rgba(0,0,0,.15);} */
.btn:hover { background: var(--muted-bg); transform: translateY(-1px); }
.btn:active { transform: translateY(0); box-shadow: none; }
.btn:focus-visible { outline: none; box-shadow: var(--focus-ring); }
.btn:disabled { opacity: .5; cursor: not-allowed; box-shadow: none; }

/* Sizes */
.btn-xs { height: var(--btn-height-xs); padding: 0 .35rem; font-size: var(--font-size-xs);}
.btn-sm { height: var(--btn-height-sm); padding: 0 .75rem; font-size: var(--font-size-sm); }
.btn-lg { height: var(--btn-height-lg); padding: 0 1.25rem; font-size: var(--font-size-lg); }
.btn-xl { height: var(--btn-height-xl); padding: 0 2rem; font-size: var(--font-size-xl); }

/* Solid Variants */
.btn-primary { background: var(--primary-color); color: white; border-color: var(--primary-color); }
.btn-success { background: var(--success-color); color: white; border-color: var(--success-color); }
.btn-danger  { background: var(--danger-color);  color: white; border-color: var(--danger-color); }
.btn-warning { background: var(--warning-color); color: black; border-color: var(--warning-color); }

.btn-primary:hover { background: var(--primary-color); color: white; filter: brightness(1.1); }
.btn-success:hover { background: var(--success-color); color: white; filter: brightness(1.1); }
.btn-danger:hover  { background: var(--danger-color);  color: white; filter: brightness(1.1); }
.btn-warning:hover { background: var(--warning-color); color: black; filter: brightness(0.95); }

/* Secondary & Accent */
.btn-secondary { background: var(--card-bg); color: var(--text-color); border-color: var(--border-color); }
.btn-secondary:hover { background: var(--muted-bg); color: var(--primary-color); border-color: color-mix(in oklch, var(--primary-color) 30%, transparent); }

.btn-accent { background: color-mix(in oklch, var(--warning-color) 30%, transparent); color: color-mix(in oklch, var(--primary-color) 90%, black); border-color: color-mix(in oklch, var(--warning-color) 40%, transparent); }
.btn-accent:hover { background: color-mix(in oklch, var(--warning-color) 50%, transparent); filter: brightness(0.98); }

/* Outline */
.btn-outline { background: transparent; color: var(--text-color); }
.btn-outline-primary { border-color: var(--primary-color); color: var(--primary-color); }
.btn-outline-success { border-color: var(--success-color); color: var(--success-color); }
.btn-outline-danger  { border-color: var(--danger-color);  color: var(--danger-color); }
.btn-outline-warning { border-color: var(--warning-color); color: var(--warning-color); }
.btn-outline-primary:hover { background: var(--primary-color); color: white; }
.btn-outline-success:hover { background: var(--success-color); color: white; }
.btn-outline-danger:hover  { background: var(--danger-color);  color: white; }
.btn-outline-warning:hover { background: var(--warning-color); color: black; }

/* Ghost & Soft */
.btn-ghost { background: transparent; border: none; box-shadow: none;}
.btn-ghost:hover { background: var(--muted-bg); }
.btn-soft-primary { background: var(--primary-soft); color: var(--primary-color); border: none; }
/* =========================================================
   🩸 NÚT SOFT DANGER (Đỏ nhạt)
   ========================================================= */
.btn-soft-danger {
  background: color-mix(in oklch, var(--danger-color) 12%, transparent);
  color: var(--danger-color);
  border: 1px solid transparent;
  box-shadow: none; /* Bỏ đổ bóng cho nhẹ nhàng */
}

/* Khi di chuột vào: Nổi lên thành màu Đỏ rực để cảnh báo nguy hiểm */
.btn-soft-danger:hover {
  background: var(--danger-color);
  color: #ffffff;
  border-color: var(--danger-color);
  transform: translateY(-1px);
}

/* Icon Buttons */
.btn-icon{ --btn-min-width: var(--btn-height); padding:0; border-radius:50%; }
.btn-icon .btn-text{ display:none; }
.delete-base, .edit-base, .add-base, .view-base, .save-base, .cancel-base, .search-base, .download-base, .upload-base, .print-base, .copy-base {
  min-width: var(--btn-height); padding: 0; display: inline-flex; align-items: center; justify-content: center; position: relative;
}
.delete-base .btn-text, .edit-base .btn-text, .add-base .btn-text, .view-base .btn-text { display: none; }
.delete-base::before, .edit-base::before, .add-base::before, .view-base::before, .save-base::before, .cancel-base::before, .search-base::before, .download-base::before, .upload-base::before, .print-base::before, .copy-base::before {
  font-family: "Font Awesome 5 Free"; font-weight: 900; font-size: .8rem;
}
.delete-base::before   { content: "\f2ed"; } .edit-base::before     { content: "\f044"; } 
.add-base::before      { content: "\f067"; } .copy-base::before     { content: "\f0c5"; } 
.view-base::before     { content: "\f06e"; } .save-base::before     { content: "\f0c7"; } 
.cancel-base::before   { content: "\f00d"; } .search-base::before   { content: "\f002"; } 
.download-base::before { content: "\f019"; } .upload-base::before   { content: "\f093"; } 
.print-base::before    { content: "\f02f"; } 

/* =========================================================
   🚨 ALERTS (THÔNG BÁO)
   ========================================================= */
.alert {
  padding: 12px 16px; border-radius: var(--border-radius); border: 1px solid transparent;
  margin-bottom: 1rem; display: flex; flex-direction: column; gap: 4px; background: var(--card-bg);
}
.alert-title { font-weight: 700; font-size: var(--font-size-sm); color: var(--text-color); }
.alert-desc { font-size: var(--font-size-sm); color: var(--text-color); opacity: 0.85; }

.alert-success { background: color-mix(in oklch, var(--success-color) 12%, transparent); border-color: color-mix(in oklch, var(--success-color) 30%, transparent); }
.alert-success .alert-title { color: color-mix(in oklch, var(--success-color) 80%, black); }
.alert-warning { background: color-mix(in oklch, var(--warning-color) 15%, transparent); border-color: color-mix(in oklch, var(--warning-color) 40%, transparent); }
.alert-warning .alert-title { color: color-mix(in oklch, var(--warning-color) 70%, black); }
.alert-error, .alert-danger { background: color-mix(in oklch, var(--danger-color) 12%, transparent); border-color: color-mix(in oklch, var(--danger-color) 25%, transparent); }
.alert-error .alert-title { color: color-mix(in oklch, var(--danger-color) 70%, black); }
.alert-info { background: color-mix(in oklch, var(--info-color) 12%, transparent); border-color: color-mix(in oklch, var(--info-color) 25%, transparent); }
.alert-info .alert-title { color: color-mix(in oklch, var(--info-color) 80%, black); }

/* =========================================================
   🏷️ BADGES & AVATARS
   ========================================================= */
.badge { padding: 6px 14px; border-radius: 999px; font-size: var(--font-size-xs); font-weight: 600; background: var(--muted-bg); color: var(--text-color); }
.badge-primary { background: var(--primary-color); color: white; }
.badge-success { background: var(--success-color); color: white; }
.badge-danger { background: var(--danger-color); color: white; }

/* Pill Badges (Có Dot màu) */
.badge-pill { display: inline-flex; align-items: center; gap: 6px; padding: 4px 12px; border-radius: 999px; font-size: var(--font-size-xs); font-weight: 600; white-space: nowrap; background: var(--muted-bg); color: var(--muted-color); border: 1px solid var(--border-color); }
/* ========== CHUẨN HÓA BADGES ========== */
.badge-pill { 
  display: inline-flex; align-items: center; gap: 6px; 
  padding: 6px 14px; /* Tăng padding (size) */
  border-radius: 999px; 
  font-size: var(--font-size-sm); /* Text to hơn */
  font-weight: 600; white-space: nowrap; 
  border: 1px solid transparent; /* Chuẩn bị cho outline */
}
.badge-dot { width: 6px; height: 6px; border-radius: 50%; background-color: currentColor; }

.dot-success { background-color: var(--success-color); }
.dot-warning { background-color: var(--warning-color); }
.dot-danger  { background-color: var(--danger-color); }
.dot-info    { background-color: var(--info-color); }

/* 1. Nhóm Semantic (Dành cho Trạng thái: Đang học, Kết thúc...) */
/* Thông số: Nền L 95-96 / C 0.04-0.05 cực nhạt, chữ đậm màu, có viền mờ */
.badge-status-success { background: oklch(0.96 0.04 142); color: oklch(0.45 0.12 142); border-color: oklch(0.90 0.04 142); }
.badge-status-warning { background: oklch(0.96 0.05 85); color: oklch(0.55 0.14 85); border-color: oklch(0.90 0.05 85); }
.badge-status-danger  { background: oklch(0.96 0.03 25); color: var(--danger-color); border-color: oklch(0.90 0.03 25); }
.badge-status-neutral { background: var(--muted-bg); color: var(--muted-foreground); border-color: var(--border-color); }

/* 2. Nhóm Pastel (Dành cho Phân loại: Lớp thường, ngắn hạn, bổ trợ...) */
.badge-type-1 { background: oklch(0.95 0.03 264); color: var(--primary-color); border-color: color-mix(in oklch, var(--primary-color) 20%, transparent); } /* Xanh dương */
.badge-type-2 { background: oklch(0.95 0.03 300); color: oklch(0.45 0.1 300); border-color: oklch(0.90 0.03 300); } /* Tím nhạt */
.badge-type-3 { background: oklch(0.95 0.03 200); color: oklch(0.45 0.1 200); border-color: oklch(0.90 0.03 200); } /* Xanh lơ */
.badge-type-4 { background: oklch(0.95 0.03 50); color: oklch(0.55 0.1 50); border-color: oklch(0.90 0.03 50); } /* Cam/Nâu nhạt */

.badge-soft-primary { background: color-mix(in oklch, var(--primary-color) 10%, transparent); color: var(--primary-color); border-color: color-mix(in oklch, var(--primary-color) 20%, transparent); }
.badge-soft-success { background: color-mix(in oklch, var(--success-color) 10%, transparent); color: color-mix(in oklch, var(--success-color) 90%, black); border-color: color-mix(in oklch, var(--success-color) 20%, transparent); }
.badge-soft-warning { background: color-mix(in oklch, var(--warning-color) 15%, transparent); color: color-mix(in oklch, var(--warning-color) 70%, black); border-color: color-mix(in oklch, var(--warning-color) 30%, transparent); }
.badge-soft-danger  { background: color-mix(in oklch, var(--danger-color) 10%, transparent); color: color-mix(in oklch, var(--danger-color) 80%, black); border-color: color-mix(in oklch, var(--danger-color) 20%, transparent); }
.badge-soft-accent  { background: color-mix(in oklch, var(--accent-color) 10%, transparent); color: var(--accent-color); border-color: color-mix(in oklch, var(--accent-color) 20%, transparent); }

/* Role Badges */
.role-badge { padding: 6px 14px; border-radius: 999px; font-weight: 600; display: inline-flex; gap: 6px; align-items: center; font-size: var(--font-size-xs); border: 1px solid transparent; white-space: nowrap; }
.role-admin { background: color-mix(in oklch, var(--danger-color) 10%, transparent); color: var(--danger-color); border-color: color-mix(in oklch, var(--danger-color) 25%, transparent); }
.role-manager { background: color-mix(in oklch, var(--warning-color) 12%, transparent); color: color-mix(in oklch, var(--warning-color) 70%, black); border-color: color-mix(in oklch, var(--warning-color) 30%, transparent); }
.role-teacher { background: color-mix(in oklch, var(--primary-color) 12%, transparent); color: var(--primary-color); border-color: color-mix(in oklch, var(--primary-color) 25%, transparent); }
.role-student { background: color-mix(in oklch, var(--success-color) 12%, transparent); color: var(--success-color); border-color: color-mix(in oklch, var(--success-color) 25%, transparent); }
.role-default { background: var(--muted-bg); color: var(--muted-color); border-color: var(--border-color); }

/* Avatar & Status */
.avatar { width: 38px; height: 38px; border-radius: 50%; display: inline-grid; place-items: center; background: var(--primary-soft); color: var(--primary-color); font-weight: 700; border: 1px solid color-mix(in oklch, var(--primary-color) 20%, transparent); }
.status-dot { width: 8px; height: 8px; border-radius: 50%; display: inline-block; margin-right: 4px; }
.status-on  { background: var(--success-color); }
.status-off { background: var(--danger-color); }
    .user-avatar {
        width: 42px;
        height: 42px;
        border-radius: 50%;
        background-color: var(--light-bg);
        display: flex;
        align-items: center;
        justify-content: center;
        margin-right: 15px;
        font-weight: bold;
        color: var(--primary-color);
        border: 1px solid rgba(67, 97, 238, 0.2);
    }
    
    .user-avatar img {
        width: 100%;
        height: 100%;
        object-fit: cover;
        border-radius: 50%;
    }
/* =========================================================
   🗂️ CARDS, TABLES, FILTER BAR & PAGINATION
   ========================================================= */
.card { background: var(--card-bg); color: var(--text-color); border-radius: var(--border-radius); border: 1px solid var(--border-color); box-shadow: var(--shadow-sm); overflow: hidden; }
.card-header { background: var(--muted-bg); color: var(--text-color); padding: .85rem 1.1rem; font-weight: 600; border-bottom: 1px solid var(--border-color); }
.card-body { padding: 1rem 1.1rem; }

.table-wrap { background: var(--card-bg); border-radius: var(--border-radius); border: 1px solid var(--border-color); overflow-x: auto; }
table { width: 100%; border-collapse: collapse; }
th { background: var(--table-header-bg); color: var(--table-header-text); }
thead th { background: var(--muted-bg); color: var(--text-color); padding: 8px; border: 1px solid var(--border-color); text-align: center; }
td, th { border: 1px solid var(--border-color); padding: 6px 10px; }
tbody td { padding: 8px; border: 1px solid var(--border-color); }
tbody tr:nth-child(odd) { background: var(--card-bg); }
tbody tr:nth-child(even) { background: var(--bg); } /* Zebra row (Xám rất nhẹ) */
tbody tr:hover {background: color-mix(in oklch, var(--primary-color) 6%, transparent);}
tbody tr:hover td:first-child { box-shadow: inset 4px 0 0 var(--primary-color);}

/* =========================================================
   ẨN THANH CUỘN NGANG NHƯNG VẪN CHO VUỐT TRƯỢT
   ========================================================= */
.table-wrap {
  overflow-x: auto;
  -ms-overflow-style: none;  /* Ẩn trên Internet Explorer và Edge */
  scrollbar-width: none;     /* Ẩn trên Firefox */
}

/* Ẩn trên Chrome, Safari và Opera */
.table-wrap::-webkit-scrollbar {
  display: none; 
}

.filter-section { background: var(--card-bg); padding: 1.125rem 1.25rem; border-radius: var(--border-radius); box-shadow: var(--shadow-md); margin-bottom: 1.125rem; border: 1px solid var(--border-color); }
.filter-row { display: flex; align-items: flex-end; gap: 0.875rem; flex-wrap: nowrap; }
.filter-group { flex: 1; min-width: 180px; }
.filter-label { font-weight: 500; color: var(--primary-color); font-size: var(--font-size-base); display: block; margin-bottom: 0.25rem; line-height: var(--line-height-tight); }
.filter-control { width: 100%; padding: 0.5rem 0.75rem; font-size: var(--font-size-base); border: 1px solid var(--border-color); border-radius: calc(var(--border-radius) - 2px); background: var(--card-bg); color: var(--text-color); transition: var(--transition); line-height: var(--line-height-normal); }
.filter-control:focus { border-color: var(--primary-color); outline: none; box-shadow: var(--focus-ring); }

.search-container { position: relative; flex: 1; min-width: 250px; }
.search-container input { width: 100%; height: 2.375rem; padding: 0.5rem 2.5rem 0.5rem 0.9375rem; border: 2px solid var(--border-color); border-radius: calc(var(--border-radius) - 2px); transition: var(--transition); font-size: var(--font-size-base); background: var(--card-bg); color: var(--text-color); }
.search-container input:focus { border-color: var(--primary-color); outline: none; box-shadow: var(--focus-ring); }
.search-icon { position: absolute; right: 0.75rem; top: 50%; transform: translateY(-50%); color: var(--muted-color); font-size: var(--font-size-base); pointer-events: none; }
.filter-actions { display: flex; gap: 8px; align-items: end; justify-content: flex-end; max-width: 350px; flex: 0 0 auto; }
.filter-section.compact .filter-group { min-width: 160px; }
.filter-section.wide .filter-group { min-width: 220px; }
.filter-section.nowrap .filter-row { flex-wrap: nowrap; }
.filter-section.wrap .filter-row { flex-wrap: wrap; }

.pagination { margin-left: auto; display: flex; gap: 6px; align-items: center; }
.page-btn { background: var(--card-bg); color: var(--text-color); border: 1px solid var(--border-color); border-radius: 6px; padding: 6px 10px; cursor: pointer; height: 36px; transition: all .2s; }
.page-btn:hover { background: var(--primary-color); color: #fff; border-color: var(--primary-color); }
.page-btn[disabled] { opacity: .5; cursor: not-allowed; }

/* =========================================================
   📝 FORM ELEMENTS (Inputs, Selects, Checkboxes, Switches)
   ========================================================= */
.form-label { display: block; font-weight: 500; color: var(--primary-color); font-size: var(--font-size-base); margin: 0.5rem 0; line-height: var(--line-height-tight); transition: color 0.25s ease; }
.has-error .form-label, .form-label.error { color: var(--danger-color); }
.form-label:hover { color: var(--accent-color); }
.help { font-size: var(--font-size-xs); color: var(--muted-color); margin-top: 4px; }

input[type="text"], input[type="password"], input[type="email"], input[type="number"], input[type="search"],
input[type="url"], input[type="tel"], input[type="date"], input[type="time"], input[type="datetime-local"],
input[type="month"], input[type="week"], textarea, select, .form-control, .input { 
  width: 100%; 
  height: var(--btn-height); /* Đã fix cứng 38px */
  padding: 0 0.75rem;        /* Padding trên-dưới = 0, trái-phải = 0.75rem */
  border-radius: var(--border-radius); 
  border: 1px solid var(--border-color); 
  background: var(--card-bg); 
  color: var(--text-color); 
  
  font-size: var(--font-size-base); 
  
  transition: var(--transition); 
  line-height: normal; 
  box-shadow: 0 1px 2px rgba(0,0,0,0.02); 
  font-family: var(--font-sans); 
}
input:focus, textarea:focus, select:focus, .form-control:focus, .input:focus { border-color: var(--primary-color); outline: none; box-shadow: var(--focus-ring); }
input:disabled, select:disabled, textarea:disabled, .form-control:disabled, .input:disabled { background: var(--muted-bg); color: var(--muted-color); cursor: not-allowed; opacity: 0.8; }

.dark input[type="date"], [data-theme="dark"] input[type="date"], .dark input[type="time"], [data-theme="dark"] input[type="time"], .dark input[type="datetime-local"], [data-theme="dark"] input[type="datetime-local"] { color-scheme: dark; }

/* =========================================================
   TEXTAREA (Tự động co giãn)
   ========================================================= */
textarea, 
textarea.form-control,
textarea.input {
  /* Ép chiều cao tối thiểu bằng với input thường (38px) */
  min-height: var(--btn-height); 
  height: var(--btn-height);
  
  /* Căn chỉnh padding cho chữ nằm giữa đẹp mắt ở dòng đầu */
  padding: 8px 12px; 
  
  /* Tắt thanh kéo giãn thủ công ở góc dưới cùng */
  resize: none; 
  
  /* Ẩn thanh cuộn dọc vì text đến đâu khung sẽ giãn đến đó */
  overflow-y: hidden; 
  
  line-height: var(--line-height-normal);
}

select, select.form-control { appearance: none; -webkit-appearance: none; -moz-appearance: none; background-repeat: no-repeat; background-position: right 0.75rem center; background-size: 16px; padding-right: 2.5rem; cursor: pointer; }
.dark select, [data-theme="dark"] select, .dark select.form-control, [data-theme="dark"] select.form-control { background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%23d1d5db' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E"); }

input[type="checkbox"], input[type="radio"] { width: 1.1rem; height: 1.1rem; accent-color: var(--primary-color); cursor: pointer; margin: 0; vertical-align: text-bottom; }
.radio-label, .checkbox-label { display: inline-flex; align-items: center; gap: 0.5rem; cursor: pointer; font-weight: normal; color: var(--text-color); font-size: var(--font-size-base); }

/* Switch Toggle */
.switch { display: inline-flex; align-items: center; gap: 10px; cursor: pointer; user-select: none; }
.switch input { display: none; }
.switch .track { width: 44px; height: 24px; border-radius: 999px; background: var(--muted-bg); position: relative; border: 1px solid var(--border-color); transition: var(--transition); }
.switch .thumb { position: absolute; top: 2px; left: 2px; width: 18px; height: 18px; background: #fff; border-radius: 50%; transition: transform .2s ease; box-shadow: var(--shadow-sm); }
.switch input:checked + .track { background: var(--primary-color); border-color: var(--primary-color); }
.switch input:checked + .track .thumb { transform: translateX(20px); }

/* Form Grid (12-Col System) */
.form-grid { display: grid; grid-template-columns: 1fr; gap: 1rem; margin-bottom: 1rem; }
.form-group { display: flex; flex-direction: column; }
@media (min-width: 768px) {
  .form-grid { grid-template-columns: repeat(12, 1fr); }
  .span-3 { grid-column: span 3; } .span-4 { grid-column: span 4; }
  .span-6 { grid-column: span 6; } .span-12, .form-grid .full { grid-column: span 12; }
}

/* =========================================================
   🪟 MODALS (POPUP DIALOG)
   ========================================================= */
.modal-overlay { position: fixed; inset: 0; background: var(--overlay-bg); z-index: 9998; display: flex; align-items: center; justify-content: center; padding: 1rem; opacity: 0; visibility: hidden; transition: all 0.3s ease-in-out; backdrop-filter: blur(2px); }
.modal-container { background: var(--card-bg); width: 100%; max-width: 600px; border-radius: calc(var(--border-radius) + 4px); box-shadow: var(--shadow-lg); border: 1px solid var(--border-color); z-index: 9999; display: flex; flex-direction: column; max-height: 90vh; transform: translateY(20px) scale(0.98); transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1); }
.modal-overlay.show { opacity: 1; visibility: visible; }
.modal-overlay.show .modal-container { transform: translateY(0) scale(1); }
.modal-container.modal-sm { max-width: 400px; } .modal-container.modal-lg { max-width: 800px; } .modal-container.modal-xl { max-width: 1140px; }

.modal-header { display: flex; align-items: center; justify-content: space-between; padding: 1rem 1.25rem; border-bottom: 1px solid var(--border-color); background: var(--table-header-bg); border-top-left-radius: inherit; border-top-right-radius: inherit; }
.modal-title { font-size: var(--font-size-lg); font-weight: 600; color: var(--primary-color); margin: 0; line-height: 1; }
.btn-close-modal { background: transparent; border: none; color: var(--muted-color); font-size: 1.25rem; cursor: pointer; padding: 0.25rem; line-height: 1; border-radius: 4px; transition: var(--transition); display: flex; align-items: center; justify-content: center; }
.btn-close-modal:hover { color: var(--danger-color); background: color-mix(in oklch, var(--danger-color) 10%, transparent); }

.modal-body { padding: 1.25rem; overflow-y: auto; scrollbar-width: thin; -webkit-overflow-scrolling: touch; }
.modal-footer { display: flex; align-items: center; justify-content: flex-end; gap: 0.5rem; padding: 1rem 1.25rem; border-top: 1px solid var(--border-color); background: var(--surface-bg); border-bottom-left-radius: inherit; border-bottom-right-radius: inherit; }
.modal-body .form-grid { margin-bottom: 0; }

/* =========================================================
   🔽 DROPDOWN MENU (PURE CSS)
   ========================================================= */
.dropdown {
  position: relative;
  display: inline-block;
}

/* Khung Menu thả xuống */
.dropdown-menu {
  position: absolute;
  right: 0; /* Căn mép phải của menu bằng mép phải của nút bấm */
  top: 100%;
  min-width: 140px;
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  box-shadow: var(--shadow-lg);
  z-index: 100;
  
  /* Trạng thái ẩn mặc định */
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  
  display: flex;
  flex-direction: column;
  padding: 4px;
  margin-top: 4px; /* Cách nút một chút */
}

/* Hiển thị Menu khi Hover (Máy tính) hoặc Click (Điện thoại) */
.dropdown:hover .dropdown-menu,
.dropdown:focus-within .dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

/* Từng dòng trong Menu */
.dropdown-item {
  padding: 8px 12px;
  color: var(--text-color);
  font-size: var(--font-size-sm);
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: 10px;
  border-radius: 6px;
  cursor: pointer;
  transition: var(--transition);
  text-align: left;
  background: transparent;
  border: none;
  width: 100%;
}

.dropdown-item:hover {background: var(--muted-bg);color: var(--primary-color);}

/* Icon bên trong mờ nhẹ, khi di chuột mới đậm lên màu Primary */
.dropdown-item i {color: var(--muted-color); transition: var(--transition);}
.dropdown-item:hover i {color: var(--primary-color);}

/* Responsive Mobile (Tối ưu trải nghiệm) */
body.modal-open { overflow: hidden; }
@media (max-width: 1024px) { .filter-row { flex-wrap: wrap; } }
@media (max-width: 768px) {
  /* Fix layout Header & Filter */
  .header { padding: 1rem 0; min-height: 100px; text-align: left; }
  .container { padding: 0 .75rem; }
  .form-label { font-size: var(--font-size-base); }
  .filter-section { padding: 0.875rem 1rem; }
  .filter-group { min-width: 100%; flex: 0 0 100%; }
  .search-container { min-width: 100%; }
  .filter-row { gap: 0.75rem; }
  .filter-actions.stack { width: 100%; max-width: none; justify-content: stretch; }
  .filter-actions.stack .btn { flex: 1; width: 100%; }

  /* Modal Full-screen trên Mobile */
  .modal-overlay { padding: 0; }
  .modal-container { width: 100%; max-width: 100%; height: 100%; max-height: 100vh; border-radius: 0; border: none; display: flex; flex-direction: column; }
  .modal-header { position: sticky; top: 0; z-index: 10; }
  .modal-footer { position: sticky; bottom: 0; margin-top: auto; z-index: 10; padding-bottom: calc(1rem + env(safe-area-inset-bottom)); }
  .form-grid { grid-template-columns: 1fr !important; }
  .form-grid > [class*="span-"] { grid-column: span 1 / auto !important; }
  .table-wrap thead, 
  .table-wrap th {
    display: none !important;
  }  
}
/* =========================================================
   📱 BẢNG RESPONSIVE DẠNG CARD (NO HORIZONTAL SCROLL)
   ========================================================= */
@media (max-width: 768px) {
  /* 1. Xóa bỏ cuộn ngang và viền bọc ngoài */
  .table-wrap {
    overflow-x: hidden !important; /* Cấm tuyệt đối cuộn ngang */
    background: transparent;
    border: none;
    box-shadow: none;
  }

  /* 2. Phá vỡ cấu trúc bảng truyền thống */
  table, thead, tbody, th, td, tr {
    display: block;
    width: 100%;
  }

  /* 3. Giấu đi phần Tiêu đề cột (Header) vì không còn cần thiết */
  thead tr {
    position: absolute;
    top: -9999px;
    left: -9999px;
  }

  /* 4. Biến mỗi dòng (tr) thành một Card đẹp mắt */
  tbody tr {
    background: var(--card-bg) !important;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    margin-bottom: 1rem;
    padding: 0.5rem;
    box-shadow: var(--shadow-sm);
  }

  /* 5. Định dạng lại từng ô (td) bên trong Card */
  tbody td {
    display: flex;
    justify-content: space-between; /* Nhãn bên trái, Dữ liệu bên phải */
    align-items: center;
    border: none;
    border-bottom: 1px solid var(--border-color);
    padding: 0.75rem 0.5rem;
    text-align: right; /* Ép dữ liệu nằm gọn bên phải */
    gap: 10px;
  }

  /* Xóa viền gạch ngang ở dòng cuối cùng của thẻ Card */
  tbody td:last-child {
    border-bottom: none;
  }

  /* 6. Tự động in ra Tên Cột (lấy từ thuộc tính data-label trong HTML) */
  tbody td::before {
    content: attr(data-label);
    font-weight: 600;
    color: var(--muted-color);
    font-size: var(--font-size-sm);
    text-align: left;
    flex-shrink: 0; /* Giữ nhãn không bị bóp méo */
  }

  /* Cột Hành động (Nút bấm) đưa ra giữa hoặc ép phải */
  tbody td:last-child > div {
    justify-content: flex-end !important;
    width: 100%;
  }
}
@media (max-width: 480px) { .header { min-height: 80px; padding: .75rem 0; } .content-section { padding: 2rem 0; } .search-container input { height: 2.25rem; } }

/* =========================================================
   🚀 UTILITIES (Spacing, Typography, Display)
   ========================================================= */
.p-1 { padding: .5rem; } .p-2 { padding: 1rem; } .p-3 { padding: 1.5rem; }
.m-1 { margin: .5rem; }  .m-2 { margin: 1rem; }  .m-3 { margin: 1.5rem; }

.text-primary   { color: var(--primary-color); } .text-secondary { color: var(--secondary-color); } .text-muted { color: var(--muted-color); }
.text-center { text-align: center; } .text-left { text-align: left; } .text-right { text-align: right; }
.d-none  { display: none; } .d-block { display: block; } .d-flex  { display: flex; }
@media (min-width: 768px) { .d-md-none { display: none !important; } .d-md-block { display: block !important; } .d-md-flex { display: flex !important; } }

.text-xxs { font-size: var(--font-size-xxs); } .text-xs { font-size: var(--font-size-xs); }
.text-sm { font-size: var(--font-size-sm); } .text-base { font-size: var(--font-size-base); }
.text-md { font-size: var(--font-size-md); } .text-lg { font-size: var(--font-size-lg); }
.text-xl { font-size: var(--font-size-xl); } .text-xxl { font-size: var(--font-size-xxl); }
.text-xxxl { font-size: var(--font-size-xxxl); }

.leading-tight { line-height: var(--line-height-tight); } .leading-normal { line-height: var(--line-height-normal); } .leading-loose { line-height: var(--line-height-loose); }
.font-light { font-weight: 300; } .font-normal { font-weight: 400; } .font-medium { font-weight: 500; } .font-semibold { font-weight: 600; } .font-bold { font-weight: 700; }
/* =========================================================
   💬 TOOLTIPS (PURE CSS)
   ========================================================= */

/* Kích hoạt môi trường cho phần tử chứa tooltip */
[data-tooltip], 
[data-tooltip-bottom] {
  position: relative;
  cursor: pointer;
}

/* 1. THÂN TOOLTIP (Mặc định nằm ở trên) */
[data-tooltip]::after,
[data-tooltip-bottom]::after {
  content: attr(data-tooltip); /* Lấy nội dung từ thẻ data-tooltip */
  position: absolute;
  background: color-mix(in oklch, var(--tooltip-background), white 10%); 
  color: var(--tooltip-foreground); /* Chữ sáng */
  padding: 6px 12px;
  font-size: var(--font-size-xs);
  font-weight: 500;
  border-radius: var(--tooltip-radius); 
  white-space: nowrap; /* Tránh rớt dòng */
  pointer-events: none; /* Không cản trở click chuột */
  z-index: 99999;
  box-shadow: var(--shadow-md);
  
  /* Trạng thái ẩn (nằm tụt xuống một chút) */
  opacity: 0;
  visibility: hidden;
  transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

/* 2. MŨI TÊN CHỈ XUỐNG (Mặc định nằm ở trên) */
[data-tooltip]::before,
[data-tooltip-bottom]::before {
  content: '';
  position: absolute;
  border-width: 5px;
  border-style: solid;
  pointer-events: none;
  z-index: 99999;
  
  /* Trạng thái ẩn */
  opacity: 0;
  visibility: hidden;
  transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

/* --- VỊ TRÍ: NẰM Ở TRÊN (TOP) --- */
[data-tooltip]::after {
  bottom: 100%;
  left: 50%;
  transform: translate(-50%, 8px);
}
[data-tooltip]::before {
  bottom: 100%;
  left: 50%;
  transform: translate(-50%, 8px);
  border-color: var(--foreground) transparent transparent transparent;
}

/* Hiệu ứng trượt lên khi Hover (Top) */
[data-tooltip]:hover::after,
[data-tooltip]:hover::before {
  opacity: 1;
  visibility: visible;
  transform: translate(-50%, -6px); /* Trượt lên và hiện ra */
}


/* --- VỊ TRÍ: NẰM Ở DƯỚI (BOTTOM) --- 
   Dùng attr(data-tooltip-bottom) cho các nút ở quá sát mép trên màn hình */
[data-tooltip-bottom]::after {
  content: attr(data-tooltip-bottom);
  top: 100%;
  left: 50%;
  transform: translate(-50%, -8px);
}
[data-tooltip-bottom]::before {
  top: 100%;
  left: 50%;
  transform: translate(-50%, -8px);
  border-color: transparent transparent var(--foreground) transparent;
}

/* Hiệu ứng trượt xuống khi Hover (Bottom) */
[data-tooltip-bottom]:hover::after,
[data-tooltip-bottom]:hover::before {
  opacity: 1;
  visibility: visible;
  transform: translate(-50%, 6px); /* Trượt xuống và hiện ra */
}