/* KWAY.app — "Sapphire Starship" design system
   วัสดุ: โลหะมุก/โครเมียม · กระจกฝ้าสีน้ำเงิน · อะคริลิก · แสงนีออน
   หลักการ: พื้นน้ำเงินไพลินเข้ม (ไม่ใช่ดำล้วน) มีราศีแสงจากด้านบน ลายโลหะขัดเส้นบางๆ และโครงข่ายเส้นเรขาคณิต
            ตัวอักษรหัวข้อเป็นมุกงาช้าง, ปุ่มหลักเป็นโลหะไพลิน, นีออนฟ้าใช้นำสายตาอย่างประหยัด */
:root {
  /* hull — midnight sapphire */
  --bg: #0B1A3D;
  --bg-2: #0E1F48;
  --surface: rgba(var(--n-20-38-82), .52);           /* glass */
  --surface-solid: #142852;
  --surface-2: rgba(var(--n-44-68-120), .42);
  --line: rgba(170, 195, 255, .12);
  --line-2: rgba(170, 195, 255, .22);
  --text: #F2F4FA;
  --text-2: #AEBBD8;
  --text-3: #7282A6;

  /* light */
  --neon: #5FE3FF;                            /* ice cyan — primary signal */
  --neon-2: #8FA8FF;                          /* periwinkle — secondary glow */
  --neon-soft: rgba(var(--neon-rgb), .12);
  --glow: 0 0 0 1px rgba(var(--neon-rgb), .45), 0 0 18px rgba(var(--neon-rgb), .35), 0 0 48px rgba(var(--neon-rgb), .12);
  --red: #FF6B86;
  --green: #5CF2B8;
  --amber: #FFD58A;

  /* metal */
  --chrome: linear-gradient(180deg, #FFFFFF 0%, #F1ECE2 34%, #B9B8BE 50%, #FBF8F2 64%, #D6D2CB 100%);   /* มุกงาช้าง */
  --chrome-soft: linear-gradient(180deg, #FFFFFF 0%, #DCE3F0 55%, #F4F6FB 100%);
  --sapphire: linear-gradient(180deg, #7DA2F2 0%, #4F78D2 42%, #2F55A8 58%, #4870C8 100%);            /* โลหะไพลิน */
  --rim: linear-gradient(135deg, rgba(255,255,255,.55), rgba(255,255,255,.07) 30%, rgba(255,255,255,.03) 60%, rgba(var(--neon-rgb),.35));
  --neon-grad: linear-gradient(90deg, #5FE3FF, #8FA8FF);

  --radius: 16px;
  --radius-sm: 11px;
  --blur: blur(18px) saturate(150%);
  --shadow: 0 24px 60px rgba(3, 9, 28, .55), inset 0 1px 0 rgba(255, 255, 255, .07);
  --font: 'IBM Plex Sans Thai', 'Noto Sans Thai', system-ui, sans-serif;
  --font-display: 'Chakra Petch', 'IBM Plex Sans Thai', sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, monospace;
  /* สีแบบ rgb สำหรับธีม (โหมดสว่างเปลี่ยนค่าใน theme.css) */
  --neon-rgb: 95, 227, 255;
  --n-20-38-82: 20, 38, 82;
  --n-44-68-120: 44, 68, 120;
  --n-4-10-30: 4, 10, 30;
  --n-6-16-42: 6, 16, 42;
  --n-6-14-38: 6, 14, 38;
  --n-14-30-66: 14, 30, 66;
  --n-30-52-104: 30, 52, 104;
  --n-12-26-60: 12, 26, 60;
  --n-70-100-160: 70, 100, 160;
  --n-40-64-118: 40, 64, 118;
  --n-10-22-52: 10, 22, 52;
  --n-8-18-44: 8, 18, 44;
  --n-18-36-78: 18, 36, 78;
  --n-18-36-80: 18, 36, 80;
  --n-30-60-120: 30, 60, 120;
  --n-12-28-64: 12, 28, 64;
  --n-14-30-68: 14, 30, 68;
  color-scheme: dark;
}
* { box-sizing: border-box; }
[hidden] { display: none !important; } /* ให้ attribute hidden ชนะ class ที่กำหนด display เสมอ */
html, body { margin: 0; color: var(--text); font-family: var(--font); font-size: 15px; line-height: 1.6; -webkit-font-smoothing: antialiased; }
html { background: var(--bg); }
body {
  /* ราศี: แสงสาดจากด้านบน + ขอบมืดลงอย่างนุ่มนวล */
  background:
    radial-gradient(1400px 760px at 50% -18%, rgba(88, 132, 230, .55), transparent 62%),
    radial-gradient(900px 600px at 100% 0%, rgba(120, 150, 255, .16), transparent 60%),
    radial-gradient(900px 700px at 0% 100%, rgba(40, 90, 200, .22), transparent 60%),
    linear-gradient(180deg, #16306B 0%, #0F2352 38%, #0B1A3D 72%, #091633 100%);
  background-attachment: fixed;
}
/* ลายโลหะขัดเส้น + โครงข่ายเส้นเรขาคณิตที่มุมจอ */
body::before {
  content: ''; position: fixed; inset: 0; pointer-events: none; z-index: 0;
  background-image:
    url(/img/mesh.svg), url(/img/mesh.svg),
    repeating-linear-gradient(0deg, rgba(255,255,255,.018) 0 1px, transparent 1px 3px),
    repeating-linear-gradient(90deg, rgba(255,255,255,.008) 0 1px, transparent 1px 7px);
  background-repeat: no-repeat, no-repeat, repeat, repeat;
  background-position: right -180px top -140px, left -220px bottom -200px, 0 0, 0 0;
  background-size: 900px 700px, 900px 700px, auto, auto;
}
body::after {
  content: ''; position: fixed; inset: 0; pointer-events: none; z-index: 0;
  background: radial-gradient(ellipse at 50% 40%, transparent 55%, rgba(var(--n-4-10-30), .45) 100%);
}
body > * { position: relative; z-index: 1; }
a { color: var(--neon); text-decoration: none; }
button { font: inherit; color: inherit; cursor: pointer; }
input, textarea, select { font: inherit; color: var(--text); }
h1, h2, h3, h4 { font-family: var(--font-display); font-weight: 600; line-height: 1.2; margin: 0; letter-spacing: -.005em; }
::selection { background: rgba(var(--neon-rgb), .3); }
* { scrollbar-width: thin; scrollbar-color: rgba(170, 195, 255, .15) transparent; }

/* ---------- text materials ---------- */
.chrome-text { background: var(--chrome); -webkit-background-clip: text; background-clip: text; color: transparent; }
.neon-text { color: var(--neon); text-shadow: 0 0 12px rgba(var(--neon-rgb), .55), 0 0 32px rgba(var(--neon-rgb), .25); }
.grad-text { background: var(--neon-grad); -webkit-background-clip: text; background-clip: text; color: transparent; }
.muted { color: var(--text-2); }
.tiny { font-size: 12px; color: var(--text-3); }
.eyebrow { font-family: var(--font-display); font-size: 11.5px; letter-spacing: .22em; text-transform: uppercase; color: var(--text-3); }

/* ---------- glass panel (ใช้ .card) — ขอบโลหะไล่แสงด้วย mask ---------- */
.card, .glass {
  position: relative; background: var(--surface); border-radius: var(--radius);
  backdrop-filter: var(--blur); -webkit-backdrop-filter: var(--blur);
  box-shadow: var(--shadow); border: 1px solid transparent;
}
.card::before, .glass::before {
  content: ''; position: absolute; inset: -1px; border-radius: inherit; padding: 1px; pointer-events: none;
  background: var(--rim);
  -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0); -webkit-mask-composite: xor; mask-composite: exclude;
}

/* ---------- buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px; position: relative;
  border: 1px solid var(--line-2); background: rgba(255, 255, 255, .04); color: var(--text);
  padding: 10px 18px; border-radius: 12px; font-weight: 500; transition: .18s; white-space: nowrap;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, .08);
}
.btn:hover { border-color: rgba(var(--neon-rgb), .5); box-shadow: inset 0 1px 0 rgba(255,255,255,.1), 0 0 16px rgba(var(--neon-rgb), .18); }
/* ปุ่มหลัก: แท่งโลหะขัดเงา */
.btn.primary, .btn.grad {
  background: var(--sapphire); color: #fff; border-color: transparent; font-weight: 600; text-shadow: 0 1px 1px rgba(10, 30, 80, .5);
  box-shadow: inset 0 1px 0 rgba(255,255,255,.55), inset 0 -2px 0 rgba(10,30,80,.35), 0 8px 24px rgba(20, 50, 130, .45), 0 0 0 1px rgba(190, 215, 255, .55);
}
.btn.primary:hover, .btn.grad:hover { filter: brightness(1.08); box-shadow: inset 0 1px 0 rgba(255,255,255,.6), 0 0 0 1px rgba(var(--neon-rgb),.8), 0 0 26px rgba(var(--neon-rgb), .35); }
/* ปุ่มนีออน */
.btn.neon { background: rgba(var(--neon-rgb), .08); color: var(--neon); border-color: rgba(var(--neon-rgb), .55); box-shadow: 0 0 14px rgba(var(--neon-rgb),.2), inset 0 0 12px rgba(var(--neon-rgb),.08); }
.btn.neon:hover { background: rgba(var(--neon-rgb), .14); box-shadow: var(--glow); }
.btn.ghost { background: transparent; border-color: transparent; box-shadow: none; }
.btn.ghost:hover { background: rgba(255,255,255,.05); }
.btn.sm { padding: 6px 12px; font-size: 13px; border-radius: 10px; }
.btn:disabled { opacity: .45; cursor: not-allowed; filter: none; }
.icon-btn { width: 38px; height: 38px; border-radius: 11px; display: inline-grid; place-items: center; border: 1px solid transparent; background: transparent; color: var(--text-2); transition: .15s; }
.icon-btn:hover { background: rgba(255,255,255,.05); border-color: var(--line); color: var(--text); }
.icon-btn.on { color: var(--neon); border-color: rgba(var(--neon-rgb),.5); box-shadow: 0 0 12px rgba(var(--neon-rgb),.25); }
svg.i { width: 18px; height: 18px; stroke: currentColor; fill: none; stroke-width: 1.6; stroke-linecap: round; stroke-linejoin: round; flex: none; }

/* ---------- inputs ---------- */
.field { display: flex; flex-direction: column; gap: 6px; margin-bottom: 14px; }
.field label { font-size: 12.5px; color: var(--text-2); letter-spacing: .02em; }
.input { background: rgba(var(--n-6-16-42), .45); border: 1px solid var(--line-2); border-radius: var(--radius-sm); padding: 11px 14px; outline: none; transition: .15s; width: 100%; box-shadow: inset 0 2px 6px rgba(0,0,0,.35); }
.input:focus { border-color: rgba(var(--neon-rgb), .6); box-shadow: inset 0 2px 6px rgba(0,0,0,.35), 0 0 0 3px rgba(var(--neon-rgb),.12); }
select.input option { background: var(--surface-solid); }
.pill { display: inline-flex; align-items: center; gap: 6px; padding: 3px 10px; border-radius: 999px; background: rgba(255,255,255,.04); border: 1px solid var(--line-2); font-size: 12px; color: var(--text-2); font-family: var(--font-display); letter-spacing: .04em; }
.pill.gold, .pill.neon { color: var(--neon); border-color: rgba(var(--neon-rgb), .4); background: var(--neon-soft); box-shadow: 0 0 12px rgba(var(--neon-rgb),.15); }
.pill .led { width: 6px; height: 6px; border-radius: 50%; background: var(--neon); box-shadow: 0 0 8px var(--neon); }
.badge { font-size: 11px; padding: 3px 10px; border-radius: 999px; background: var(--chrome); color: #0B1A3D; font-weight: 700; font-family: var(--font-display); letter-spacing: .02em; box-shadow: 0 0 16px rgba(var(--neon-rgb),.3); }

/* ---------- modal ---------- */
.modal-bg { position: fixed; inset: 0; background: rgba(var(--n-6-14-38), .7); backdrop-filter: blur(10px); display: none; align-items: center; justify-content: center; z-index: 100; padding: 16px; }
.modal-bg.open { display: flex; animation: fade .2s ease; }
.modal { background: rgba(var(--n-14-30-66), .82); backdrop-filter: var(--blur); border: 1px solid var(--line-2); border-radius: 22px; width: min(440px, 100%); max-height: 92vh; overflow: auto; padding: 30px; box-shadow: var(--shadow), 0 0 80px rgba(var(--neon-rgb),.06); position: relative; }
.modal::after { content: ''; position: absolute; left: 24px; right: 24px; top: 0; height: 1px; background: linear-gradient(90deg, transparent, rgba(var(--neon-rgb),.7), transparent); }
.modal.wide { width: min(1080px, 100%); }
.modal .close { position: absolute; top: 14px; right: 14px; }
@keyframes fade { from { opacity: 0; } }

/* toast */
#toasts { position: fixed; bottom: 22px; left: 50%; transform: translateX(-50%); z-index: 200; display: flex; flex-direction: column; gap: 8px; align-items: center; pointer-events: none; }
.toast { background: rgba(var(--n-14-30-66), .9); backdrop-filter: var(--blur); border: 1px solid rgba(var(--neon-rgb),.35); padding: 10px 16px; border-radius: 12px; box-shadow: var(--shadow), 0 0 20px rgba(var(--neon-rgb),.12); animation: up .25s ease; font-size: 14px; }
.toast.err { border-color: rgba(255, 85, 119, .6); box-shadow: var(--shadow), 0 0 20px rgba(255,85,119,.15); }
@keyframes up { from { opacity: 0; transform: translateY(8px); } }

/* ---------- pricing ---------- */
.plans { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; }
.plan { padding: 24px; display: flex; flex-direction: column; gap: 14px; }
.plan h3 { font-size: 15px; letter-spacing: .18em; text-transform: uppercase; color: var(--text-2); }
.plan.popular { background: linear-gradient(180deg, rgba(var(--neon-rgb),.08), rgba(var(--n-20-38-82),.55) 40%); box-shadow: var(--shadow), 0 0 0 1px rgba(var(--neon-rgb),.45), 0 0 40px rgba(var(--neon-rgb),.12); }
.plan.popular h3 { color: var(--neon); }
.plan .price { font-family: var(--font-display); font-size: 36px; font-weight: 600; background: var(--chrome); -webkit-background-clip: text; background-clip: text; color: transparent; }
.plan .price small { font-size: 14px; -webkit-text-fill-color: var(--text-3); font-weight: 400; }
.plan ul { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: 8px; font-size: 14px; color: var(--text-2); flex: 1; }
.plan li { display: flex; gap: 10px; }
.plan li::before { content: ''; width: 6px; height: 6px; margin-top: 9px; flex: none; transform: rotate(45deg); background: var(--neon); box-shadow: 0 0 8px var(--neon); }
.plan .badge { position: absolute; top: -11px; right: 18px; }
.topups { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 12px; }
.topup { padding: 16px 18px; display: flex; justify-content: space-between; align-items: center; gap: 10px; }
.topup b { font-family: var(--font-display); font-weight: 600; font-size: 17px; }
@media (max-width: 900px) { .plans { grid-template-columns: 1fr 1fr; } }
@media (max-width: 560px) { .plans { grid-template-columns: 1fr; } }

.spin { width: 14px; height: 14px; border: 1.5px solid rgba(var(--neon-rgb),.15); border-top-color: var(--neon); border-radius: 50%; animation: rot .8s linear infinite; display: inline-block; flex: none; box-shadow: 0 0 8px rgba(var(--neon-rgb),.3); }
@keyframes rot { to { transform: rotate(360deg); } }

/* ---------- logo / wordmark ---------- */
.logo { display: flex; align-items: center; gap: 11px; color: var(--text); }
.logo img { width: 34px; height: 34px; filter: drop-shadow(0 0 10px rgba(var(--neon-rgb),.25)); }
.logo > span { font-family: var(--font-display); font-weight: 700; font-size: 19px; letter-spacing: .26em; background: var(--chrome); -webkit-background-clip: text; background-clip: text; color: transparent; }
.logo span.dot { font-weight: 500; letter-spacing: .08em; background: none; -webkit-text-fill-color: var(--neon); text-shadow: 0 0 10px rgba(var(--neon-rgb),.6); margin-left: 2px; }

/* เส้นแสงนีออนแนวนอน */
.neon-line { height: 1px; background: linear-gradient(90deg, transparent, rgba(var(--neon-rgb),.8), transparent); box-shadow: 0 0 10px rgba(var(--neon-rgb),.6); border: 0; }