:root { --ink: #17324d; --blue: #1f5f94; --line: #dbe5ef; --pale: #f4f8fc; }
* { box-sizing: border-box; }
body { margin: 0; background: #f3f6f9; color: var(--ink); font-family: Arial, "Hiragino Kaku Gothic ProN", "Yu Gothic", sans-serif; }
main { max-width: 1080px; margin: 0 auto; padding: 44px 24px 72px; }
.hero { display: flex; justify-content: space-between; align-items: end; gap: 24px; padding: 12px 4px 30px; flex-wrap: wrap; }
.eyebrow { margin: 0 0 8px; color: #4b83b4; font-size: 12px; font-weight: 700; letter-spacing: .14em; }
h1 { margin: 0; font-size: clamp(30px, 5vw, 44px); letter-spacing: .03em; }
.lead { margin: 10px 0 0; color: #607386; }
.hero-controls { display: flex; align-items: end; gap: 16px; flex-wrap: wrap; }
.month-picker { display: grid; gap: 7px; min-width: 172px; color: #536b80; font-size: 13px; font-weight: 700; }
input, select { border: 1px solid #b8c9d9; border-radius: 7px; background: #fff; color: var(--ink); font: inherit; }
.month-picker input { padding: 10px 12px; font-size: 16px; }

.auth-bar { display: flex; align-items: center; gap: 8px; }
.auth-bar form { display: flex; gap: 6px; }
.auth-bar input[type="password"] { padding: 9px 10px; width: 150px; }
.auth-bar button { border: 0; border-radius: 7px; background: var(--blue); color: #fff; padding: 9px 14px; font-weight: 700; cursor: pointer; }
.auth-bar .logged-in { display: flex; align-items: center; gap: 10px; }
.auth-bar .logged-in span { padding: 7px 12px; border-radius: 99px; background: #e8f3ea; color: #35724c; font-size: 12px; font-weight: 700; }
.auth-bar .logout-btn { background: transparent; border: 1px solid #b8c9d9; color: #536b80; }

.login-gate { min-height: 72vh; display: flex; align-items: center; justify-content: center; padding: 40px 16px; }
.login-box { width: 100%; max-width: 380px; padding: 40px 32px 32px; border-radius: 16px; background: #fff; box-shadow: 0 10px 34px #17324d17; text-align: center; }
.login-box .eyebrow { text-align: center; }
.login-box h1 { font-size: 30px; }
.login-box .lead { margin-bottom: 26px; }
.login-box .notice { text-align: left; margin: 0 0 18px; }
.login-form { display: flex; flex-direction: column; gap: 16px; text-align: left; }
.login-form label { display: grid; gap: 6px; font-size: 13px; font-weight: 700; color: #536b80; }
.login-form input { padding: 11px 12px; font-size: 15px; width: 100%; }
.login-form button { margin-top: 4px; border: 0; border-radius: 8px; background: var(--blue); color: #fff; padding: 12px 14px; font-weight: 700; font-size: 15px; cursor: pointer; }

.course-tabs { display: flex; gap: 8px; margin: 0 0 12px; }
.course-tabs button { min-width: 122px; padding: 10px 18px; border: 1px solid #b9cad9; border-radius: 8px 8px 0 0; background: #eaf1f7; color: #5a7185; font: inherit; font-weight: 700; cursor: pointer; }
.course-tabs button.active { border-color: var(--blue); background: var(--blue); color: #fff; }

.limits { margin: 0 0 20px; padding: 18px 20px; border: 1px solid #d9e5ef; border-radius: 12px; background: #fff; }
.limits h2 { margin-bottom: 12px; font-size: 16px; }
.limits div { display: flex; flex-wrap: wrap; gap: 8px; }
.limits span { padding: 8px 10px; border-radius: 7px; background: #f0f6fb; color: #315e82; font-size: 13px; }
.limits b { margin-left: 8px; color: #17324d; }

.slot-cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 14px; padding: 18px; }
.slot-card { overflow: hidden; border: 1px solid #dbe5ef; border-radius: 10px; }
.slot-card header { display: flex; justify-content: space-between; gap: 8px; padding: 12px; background: #edf4fa; color: #315e82; }
.slot-card header span { font-size: 13px; font-weight: 700; }

.grid-card { grid-column: span 1; }
.name-grid { min-width: 0; width: 100%; border-collapse: collapse; }
.name-grid th, .name-grid td { padding: 0; border: 1px solid #d7dfe7; text-align: center; }
.name-grid thead th { padding: 8px 4px; background: #f3f6f8; color: #17324d; font-size: 12px; }
.name-grid tbody th { width: 32%; padding: 7px 5px; background: #fafafa; color: #315e82; font-size: 12px; }
.name-grid td input { width: 100%; min-width: 0; padding: 7px 4px; border: 0; border-radius: 0; text-align: center; font-size: 13px; }
.name-grid td.blocked { background: #666; }
.name-grid td.readonly-name { padding: 7px 4px; font-size: 13px; color: #536b80; }
.name-grid td.readonly-name.filled { color: #17324d; font-weight: 700; }

.bike-cards { grid-template-columns: 1fr; }
.bike-card { overflow-x: auto; }
.bike-card header label { font-size: 12px; }
.bike-card header select { width: 58px; min-width: 58px; padding: 4px; border: 1px solid #c6d4df; border-radius: 5px; background: #fff; }
.bike-card header { align-items: center; flex-wrap: wrap; }
.bike-card header label { display: flex; align-items: center; gap: 5px; }
.bike-card .total-remaining { color: #1d6b48; }
.bike-card .name-grid { min-width: 1560px; }
.bike-card .name-grid tbody th { width: 90px; }
.bike-card .name-grid tbody th select { width: 56px; min-width: 56px; margin-top: 4px; padding: 4px; text-align: center; }
.bike-card .name-grid tbody th small { display: block; margin-top: 4px; color: #315e82; }
.bike-card select { width: 100%; min-width: 82px; border: 0; padding: 6px; font-size: 12px; }
.bike-label { color: #315e82; font-weight: 700; font-size: 12px; white-space: nowrap; }
.bike-card .name-grid td:has(select) { width: 86px; }
.bike-card select { width: 82px; min-width: 82px; padding: 6px 2px; }
.bike-card .name-grid td:has(input) { min-width: 145px; }
.bike-card .name-grid td:has(input) input { min-width: 145px; padding-left: 9px; text-align: left; }

.master-body { max-width: 680px; padding: 24px; }
.master-body h3 { margin: 22px 0 9px; font-size: 16px; }
.master-body > input { width: 100px; padding: 9px; }
.master-row { display: flex; align-items: center; justify-content: space-between; gap: 20px; max-width: 460px; padding: 9px 0; border-bottom: 1px solid #e5ebf0; }
.master-row input { width: 90px; padding: 8px; }
.add-slot { display: flex; flex-wrap: wrap; gap: 8px; }
.add-slot input { padding: 9px; }
.add-slot button, .master-slots button { border: 0; border-radius: 7px; background: #1f5f94; color: #fff; padding: 9px 13px; font-weight: 700; cursor: pointer; }
.master-slots { padding: 0; list-style: none; }
.master-slots li { display: flex; justify-content: space-between; max-width: 460px; padding: 9px 0; border-bottom: 1px solid #e5ebf0; }
.master-slots button { background: transparent; color: #ae4034; padding: 0; }
.master-note { margin: 0 0 12px; padding: 10px 12px; border-radius: 8px; background: #fff8e6; color: #8a6414; font-size: 13px; }

.panel { overflow: hidden; border: 1px solid var(--line); border-radius: 14px; background: #fff; box-shadow: 0 3px 16px #17324d0a; }
.panel-heading { display: flex; align-items: center; justify-content: space-between; gap: 20px; padding: 22px 24px; border-bottom: 1px solid var(--line); flex-wrap: wrap; }
h2 { margin: 0; font-size: 21px; }
.panel-heading p { margin: 5px 0 0; color: #687d90; font-size: 14px; }
.saved { padding: 7px 10px; border-radius: 99px; background: #e8f3ea; color: #35724c; font-size: 12px; font-weight: 700; white-space: nowrap; }
.saved.readonly { background: #f0f0f0; color: #7d8c99; }
.notice { margin: 16px 24px 0; padding: 12px 14px; border-radius: 8px; background: #fff1ef; color: #a43a2c; font-weight: 700; }
.notice.info { background: #eaf2fb; color: #1f5f94; }

@media (max-width: 640px) {
  main { padding: 26px 14px 48px; }
  .hero { align-items: start; flex-direction: column; }
  .month-picker { width: 100%; }
  .panel-heading { align-items: start; flex-direction: column; padding: 18px; }
  .saved { white-space: normal; }
}