* { margin: 0; padding: 0; box-sizing: border-box; }
body { background: #f0f2f5; font: 14px/1.6 "Microsoft YaHei", "PingFang SC", Arial, sans-serif; color: #333; }
a { color: #2b6db3; text-decoration: none; }
a:hover { color: #e4393c; }
img { border: 0; }
ul, ol { list-style: none; }

/* ---------- top ---------- */
#topbar { background: #fff; border-bottom: 1px solid #e5e5e5; }
#topbar .wrap { width: 990px; margin: 0 auto; padding: 4px 0; color: #666; display: flex; justify-content: space-between; }
#topbar a { margin: 0 6px; }
#topbar .right a.red { color: #e4393c; }
#topbar .right a.green { color: #396; font-weight: bold; }

/* ---------- logo ---------- */
#logo_area { background: #fff; }
#logo_area .wrap { width: 990px; margin: 0 auto; padding: 12px 0; display: flex; align-items: center; justify-content: space-between; }
#logo { display: block; }
#logo .logo_txt { display: inline-block; background: #2b6db3; color: #fff; font-size: 22px; font-weight: bold; padding: 8px 14px; border-radius: 4px; letter-spacing: 2px; }
#logo .logo_sub { margin-left: 10px; color: #999; font-size: 13px; }

/* ---------- nav ---------- */
#nav { background: #2b6db3; }
#nav ul { width: 990px; margin: 0 auto; }
#nav ul li { float: left; }
#nav ul li a { display: block; color: #fff; padding: 0 18px; line-height: 40px; font-size: 14px; }
#nav ul li a:hover, #nav ul li.on a { background: #245d9c; color: #ffd800; }
#nav ul li.on a { background: #1f5592; font-weight: bold; }

/* ---------- main ---------- */
#main { width: 990px; margin: 0 auto; padding-top: 8px; }
.kuang { background: #fff; border: 1px solid #e1e1e1; margin-bottom: 8px; }
.kuang_title { background: url('data:image/gif;base64,R0lGODlhAQABAIAAAAUEBAAAACwAAAAAAQABAAACAkQBADs=') #eef3fa; height: 34px; line-height: 34px; padding: 0 12px; font-size: 14px; border-bottom: 2px solid #2b6db3; color: #2b6db3; font-weight: bold; }
.kuang_title a { color: #2b6db3; }
.kuang_title .crumb { color: #999; font-weight: normal; margin-right: 8px; }
.kuang_title .crumb a { color: #2b6db3; }
.kuang_title h1 { display: inline; font-size: 15px; font-weight: bold; }
.kuang_body { padding: 12px; }

.breadcrumb { padding: 8px 0; color: #999; }
.breadcrumb a { color: #2b6db3; }
.breadcrumb .sep { margin: 0 6px; color: #ccc; }

/* ---------- tool grid (portal) ---------- */
.h2dabiaoti { font-size: 18px; color: #2b6db3; margin: 10px 12px 4px; }
.huisefengexian { height: 1px; background: #e5e5e5; margin: 0 12px 10px; }
.sy_ico { display: flex; flex-wrap: wrap; padding: 6px 10px 12px; }
.sy_ico_k { width: 23%; margin: 8px 1%; }
.sy_ico_k a { display: flex; align-items: center; padding: 10px 8px; border: 1px solid transparent; border-radius: 6px; }
.sy_ico_k a:hover { border-color: #2b6db3; background: #f4f8fd; }
.t_b { flex: 0 0 52px; width: 52px; height: 52px; border-radius: 10px; display: flex; align-items: center; justify-content: center; font-size: 24px; color: #fff; font-weight: bold; margin-right: 10px; }
.i_k .i_k_t { display: block; font-size: 15px; color: #333; font-weight: bold; line-height: 1.4; }
.i_k .i_k_i { display: block; font-size: 12px; color: #999; line-height: 1.4; margin-top: 2px; }

/* ---------- tool page ---------- */
.tool_box { max-width: 760px; margin: 0 auto; }
.tool_box h2 { font-size: 18px; color: #333; margin-bottom: 6px; }
.tool_box .tool_desc { color: #999; font-size: 13px; margin-bottom: 16px; }
.tool_form { background: #fafbfc; border: 1px solid #e8e8e8; border-radius: 6px; padding: 18px 20px; }
.form_row { margin-bottom: 14px; }
.form_row:last-child { margin-bottom: 0; }
.form_row label { display: inline-block; width: 110px; color: #555; text-align: right; margin-right: 8px; vertical-align: middle; }
.form_row .controls { display: inline-block; vertical-align: middle; }
.form_row input[type="text"], .form_row input[type="number"], .form_row select, .form_row textarea {
  padding: 7px 10px; border: 1px solid #c8c8c8; border-radius: 4px; font-size: 14px; color: #333; background: #fff;
  width: 220px; vertical-align: middle;
}
.form_row textarea { width: 420px; height: 120px; resize: vertical; }
.form_row input:focus, .form_row select:focus, .form_row textarea:focus { outline: none; border-color: #2b6db3; box-shadow: 0 0 4px rgba(43,109,179,.3); }
.form_row .unit_label { color: #666; margin-left: 6px; }
.btn { background: #2b6db3; color: #fff; border: 0; padding: 8px 24px; font-size: 14px; border-radius: 4px; cursor: pointer; }
.btn:hover { background: #245d9c; }
.btn_gray { background: #aaa; }
.btn_gray:hover { background: #999; }
.result_box { margin-top: 16px; border: 1px solid #d6e4f2; background: #f2f7fd; border-radius: 6px; padding: 16px 20px; display: none; }
.result_box .result_line { font-size: 15px; margin-bottom: 8px; color: #333; }
.result_box .result_num { color: #e4393c; font-size: 20px; font-weight: bold; margin: 0 4px; }
.result_box .result_note { color: #999; font-size: 12px; margin-top: 6px; }
.result_box.show { display: block; }
.err_tip { color: #e4393c; font-size: 13px; padding: 6px 0; }

/* swap button */
.swap_btn { display: inline-block; color: #2b6db3; cursor: pointer; margin-left: 8px; font-size: 13px; }
.swap_btn:hover { color: #e4393c; }

/* word count table */
.tip_table { width: 100%; border-collapse: collapse; margin-top: 10px; font-size: 13px; }
.tip_table th, .tip_table td { border: 1px solid #e1e1e1; padding: 8px 10px; text-align: left; }
.tip_table th { background: #f2f7fd; color: #2b6db3; font-weight: bold; width: 33%; }

/* 24 game card */
.card_24 { width: 180px; height: 240px; border: 1px solid #e1e1e1; border-radius: 10px; background: #fff; box-shadow: 0 2px 6px rgba(0,0,0,.08); display: flex; flex-direction: column; align-items: center; justify-content: center; margin: 0 auto; }
.card_24 .n { font-size: 60px; color: #2b6db3; font-weight: bold; }
.card_24 .s { color: #999; font-size: 13px; margin-top: 6px; }

/* ---------- bottom ---------- */
#main_new { padding-top: 8px; }
#main_new .link_list { padding: 12px; }
#main_new .link_list a { display: inline-block; margin: 3px 8px; color: #2b6db3; }
#main_new .link_list a:hover { color: #e4393c; }
#bottom { width: 990px; margin: 10px auto 20px; text-align: center; color: #999; font-size: 13px; }
#bottom a { color: #999; }

/* ---------- scientific calculator ---------- */
.calc { max-width: 360px; margin: 0 auto; background: #fff; border: 1px solid #e1e1e1; border-radius: 8px; padding: 14px; box-shadow: 0 2px 8px rgba(0,0,0,.08); }
.calc_disp { background: #f6f8fb; border: 1px solid #e1e1e1; border-radius: 6px; padding: 10px 12px; text-align: right; margin-bottom: 10px; min-height: 72px; word-break: break-all; }
.calc_disp .expr { font-size: 14px; color: #888; min-height: 18px; }
.calc_disp .result { font-size: 24px; color: #333; font-weight: bold; }
.calc_keys { display: flex; flex-wrap: wrap; }
.calc_keys .ck { width: 25%; box-sizing: border-box; }
.calc_keys button { width: calc(100% - 8px); margin: 4px; padding: 12px 0; font-size: 15px; border: 1px solid #ddd; border-radius: 6px; background: #f8f9fa; cursor: pointer; color: #333; }
.calc_keys button:hover { background: #e9eef5; border-color: #2b6db3; }
.calc_keys button.op { background: #eef3fa; color: #2b6db3; font-weight: bold; }
.calc_keys button.fn { background: #fdf6e8; color: #b8730a; font-size: 13px; }
.calc_keys button.eq { background: #2b6db3; color: #fff; font-weight: bold; }
.calc_keys button.eq:hover { background: #245d9c; }
.calc_keys button.clr { background: #fbeaea; color: #c0392b; }

/* ---------- 24 game ---------- */
.game24_setup { text-align: center; margin-bottom: 14px; }
.game24_setup input { width: 64px; height: 44px; text-align: center; font-size: 20px; border: 1px solid #c8c8c8; border-radius: 6px; margin: 0 6px; }
.game24_solution { margin-top: 12px; font-size: 15px; color: #333; line-height: 2; }
.game24_solution b { color: #e4393c; }

/* ---------- misc ---------- */
.inline_num { display: inline-block; width: 90px; text-align: center; }
.center { text-align: center; }
.mt8 { margin-top: 8px; }
#gotop { position: fixed; right: 20px; bottom: 60px; background: #2b6db3; color: #fff; width: 42px; height: 42px; line-height: 42px; text-align: center; border-radius: 6px; cursor: pointer; display: none; font-size: 18px; opacity: .9; }
#gotop:hover { opacity: 1; }

/* ---------- responsive ---------- */
@media (max-width: 1000px) {
  #main, #nav ul, #topbar .wrap, #logo_area .wrap, #bottom { width: 100%; }
  #main { padding: 8px; }
  .sy_ico_k { width: 48%; margin: 6px 1%; }
  #nav ul { padding: 0 8px; }
  #nav ul li a { padding: 0 10px; font-size: 13px; }
  .form_row label { width: 90px; }
  .form_row textarea { width: 100%; }
}
@media (max-width: 600px) {
  .sy_ico_k { width: 98%; }
  #logo .logo_sub { display: none; }
  .form_row label { display: block; text-align: left; width: auto; margin-bottom: 4px; }
  .form_row input[type="text"], .form_row input[type="number"], .form_row select { width: 100%; }
  .tool_form { padding: 12px; }
}