/* ═══════════════════════════════════════════════════════════════════════════
   auth.css — หน้า login / signup (2026-10-05) · ภาษาเดียวกับหน้าแรก (home.css v4/v5)
   ซ้าย: พื้นขาว + dot field จาง + lime glow · ฟอร์มช่องโค้ง ปุ่ม pill
   ขวา: พื้นดำ + จุด lattice โดนเมาส์ดัน (auth-fx.js) + การ์ดแก้ว
   ⚠️ ไม่ใช้ขีดไฮไลต์ใต้คำ (ผู้ใช้ไม่เอา) → บรรทัดรองใช้ .hl = ดำน้ำหนักบาง (ขาว) / lime เรืองแสง (ดำ)
   ⚠️ grid ใช้ minmax(0,1fr) · ไม่ใช้เทาอ่อนกับหัวข้อ
   ═══════════════════════════════════════════════════════════════════════════ */
:root{
  --bg:#FFFFFF; --bg-soft:#FAFAFB; --bg-mute:#F4F5F7;
  --border:#E8E9EC; --border-strong:#D5D8DD;
  --text:#0A0A0B; --text-2:#52576A; --text-3:#5B6170;
  --accent:#D4FF3E; --accent-dark:#B8E033; --accent-soft:#F4FFD0; --accent-glow:rgba(212,255,62,.4);
  --ink:#0A0A0B; --good:#10B981; --danger:#EF4444;
  --shadow-soft:0 1px 2px rgba(10,10,11,.04),0 8px 24px -8px rgba(10,10,11,.10);
  --ease:cubic-bezier(.22,1,.36,1);
}
*{margin:0;padding:0;box-sizing:border-box}
a{color:var(--ink);text-decoration:none}
::selection{background:var(--accent);color:var(--ink)}
body{font-family:'Prompt',sans-serif;background:var(--bg);color:var(--text);min-height:100vh;-webkit-font-smoothing:antialiased;display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr)}
:focus-visible{outline:2px solid var(--ink);outline-offset:3px;border-radius:6px}

/* ── ซ้าย ── */
.left{position:relative;isolation:isolate;overflow:hidden;padding:40px 48px;display:flex;flex-direction:column;justify-content:space-between;gap:32px;background:var(--bg);min-height:100vh}
.left::before{content:"";position:absolute;inset:0 0 auto 0;height:460px;z-index:-1;pointer-events:none;background-image:radial-gradient(rgba(10,10,11,.085) 1px,transparent 1.2px);background-size:22px 22px;
  -webkit-mask-image:radial-gradient(ellipse 80% 100% at 30% 0%,#000 15%,transparent 72%);mask-image:radial-gradient(ellipse 80% 100% at 30% 0%,#000 15%,transparent 72%)}
.left::after{content:"";position:absolute;left:-120px;top:-200px;width:620px;height:420px;z-index:-1;pointer-events:none;background:radial-gradient(closest-side,rgba(212,255,62,.22),transparent)}
.brand{display:inline-flex;align-items:center;gap:12px;color:inherit;align-self:flex-start}
/* โลโก้บนพื้นดำ + ย้อมสี lime ตรงธีม (เหมือน sidebar หลังบ้าน) */
.brand-mark{display:grid;place-items:center;height:48px;padding:0 14px;border-radius:14px;background:var(--ink);box-shadow:0 1px 0 rgba(255,255,255,.12) inset,0 12px 26px -12px rgba(10,10,11,.55)}
.brand-mark img{display:block;height:28px;width:auto;max-width:110px;object-fit:contain}
.brand-logo.is-tint{filter:brightness(0) saturate(100%) invert(81%) sepia(80%) saturate(402%) hue-rotate(16deg) brightness(101%) contrast(102%) drop-shadow(0 0 10px rgba(212,255,62,.28))}
.brand-text{font-weight:800;font-size:16px;letter-spacing:-.02em;line-height:1.2}
.brand-text small{display:block;font-size:10.5px;letter-spacing:.06em;color:var(--text-2);font-weight:600;margin-top:2px}

.login-wrap,.wrap{max-width:420px;width:100%;margin:auto 0}
.login-wrap h1,.wrap h1{font-size:clamp(34px,3.4vw,46px);font-weight:800;letter-spacing:-.04em;line-height:1.1;margin-bottom:12px}
.login-wrap h1 .hl,.wrap h1 .hl{font-weight:300;color:var(--ink)}
.login-sub,.sub{font-size:15px;line-height:1.7;color:var(--text-2);margin-bottom:30px}

.alert{padding:12px 15px;border-radius:14px;font-size:13px;margin-bottom:16px;display:flex;align-items:flex-start;gap:9px;font-weight:500;background:#FEF2F2;color:#991B1B;border:1px solid #FECACA}
.alert.err{background:#FEF2F2;color:#991B1B;border:1px solid #FECACA}
.alert.ok{background:#ECFDF5;color:#065F46;border:1px solid #A7F3D0}
.alert.warn{background:#FFFBEB;color:#92400E;border:1px solid #FDE68A}
.alert i{font-size:18px;flex-shrink:0;margin-top:1px}

.field{display:flex;flex-direction:column;gap:7px;margin-bottom:16px}
.field label{font-size:13px;font-weight:600;color:var(--ink);display:inline-flex;align-items:center;gap:7px}
.field label i{font-size:15px;color:var(--ink)}
.field-input{display:flex;align-items:center;gap:10px;padding:0 16px;border:1px solid var(--border-strong);border-radius:14px;background:#fff;box-shadow:var(--shadow-soft);transition:border-color .25s,box-shadow .25s}
.field-input:focus-within{border-color:var(--ink);box-shadow:0 0 0 4px rgba(212,255,62,.35)}
.field-input i{color:var(--text-2);font-size:18px}
.field-input input{flex:1;min-width:0;padding:14px 0;border:none;outline:none;font-family:inherit;font-size:14.5px;color:var(--text);background:none}
.hint{font-size:12px;color:var(--text-2)}
.row-between{display:flex;justify-content:space-between;align-items:center;gap:10px;margin:4px 0 20px;font-size:13px}
.row-between label{display:inline-flex;align-items:center;gap:8px;color:var(--text-2);cursor:pointer}
.row-between input[type=checkbox]{width:16px;height:16px;accent-color:var(--ink)}
.row-between a{font-weight:600}
.row-between a:hover{text-decoration:underline;text-underline-offset:3px}

/* ปุ่ม pill แบบ .hm-btn */
.btn-full{width:100%;height:52px;margin-top:4px;background:var(--ink);color:#fff;border:none;border-radius:100px;font-family:inherit;font-weight:600;font-size:15px;cursor:pointer;display:inline-flex;align-items:center;justify-content:center;gap:8px;
  box-shadow:0 1px 0 rgba(255,255,255,.15) inset,0 10px 24px -12px rgba(10,10,11,.6);transition:transform .3s var(--ease),box-shadow .3s}
.btn-full:hover{transform:translateY(-1px);box-shadow:0 1px 0 rgba(255,255,255,.15) inset,0 16px 32px -12px rgba(10,10,11,.6)}
.btn-full .bx-right-arrow-alt{transition:transform .3s var(--ease)}
.btn-full:hover .bx-right-arrow-alt{transform:translateX(3px)}
.btn-social{display:flex;align-items:center;justify-content:center;gap:10px;height:48px;border-radius:100px;font-weight:600;font-size:14px;border:1px solid var(--border-strong);background:#fff;color:var(--ink);box-shadow:var(--shadow-soft);transition:border-color .25s,transform .3s var(--ease)}
.btn-social:hover{border-color:var(--ink);transform:translateY(-1px)}
.btn-social i{font-size:20px}
.btn-social.line{background:#06C755;border-color:#06C755;color:#fff}
.divider{display:flex;align-items:center;gap:12px;margin:20px 0;color:var(--text-2);font-size:12px;font-weight:600}
.divider::before,.divider::after{content:"";flex:1;height:1px;background:var(--border)}
.social-list{display:flex;flex-direction:column;gap:10px}

.signup-cta{margin-top:24px;padding:14px 14px 14px 20px;border:1px solid var(--border);border-radius:100px;display:flex;align-items:center;justify-content:space-between;gap:12px;background:#fff;box-shadow:var(--shadow-soft)}
.signup-cta span{font-size:13.5px;color:var(--ink);font-weight:500}
.btn-signup{display:inline-flex;align-items:center;gap:6px;height:40px;padding:0 18px;background:var(--accent);color:var(--ink);border-radius:100px;font-weight:600;font-size:13.5px;white-space:nowrap;
  box-shadow:0 0 0 1px rgba(212,255,62,.4),0 10px 30px -8px rgba(212,255,62,.5);transition:transform .3s var(--ease),box-shadow .3s}
.btn-signup:hover{transform:translateY(-1px);box-shadow:0 0 0 1px rgba(212,255,62,.6),0 14px 38px -8px rgba(212,255,62,.75)}
.btn-signup i{font-size:17px}

.foot{font-size:12.5px;color:var(--text-2);text-align:center}
.foot a{color:var(--ink);font-weight:600}

/* signup: ขั้นตอน + OTP */
.steps-pip{display:flex;gap:8px;margin-bottom:26px}
.pip{flex:1;height:4px;border-radius:100px;background:var(--bg-mute)}
.pip.on{background:var(--ink);box-shadow:0 0 0 1px var(--ink)}
.otp-input{letter-spacing:.5em;text-align:center;font-size:24px !important;font-weight:700}
.resend{background:none;border:none;color:var(--ink);font-family:inherit;font-weight:600;font-size:13px;cursor:pointer;text-decoration:underline;text-underline-offset:3px}
.muted-row{text-align:center;margin-top:16px;font-size:13px;color:var(--text-2)}
.muted-row a{color:var(--text-2)}

/* ── ขวา (พื้นดำแบบ hero หน้าแรก) ── */
.right{position:relative;isolation:isolate;overflow:hidden;padding:44px 52px;background:var(--ink);color:#fff;display:flex;flex-direction:column;justify-content:space-between;gap:36px;min-height:100vh}
.right::before{content:"";position:absolute;inset:0;z-index:-2;pointer-events:none;
  background:radial-gradient(640px 380px at 70% 38%,rgba(212,255,62,.16),transparent 70%),radial-gradient(900px 420px at 50% 0%,rgba(255,255,255,.07),transparent 70%)}
.auth-dots{position:absolute;inset:0;z-index:-1;pointer-events:none;
  -webkit-mask-image:radial-gradient(ellipse 90% 80% at 50% 40%,#000 30%,transparent 88%);mask-image:radial-gradient(ellipse 90% 80% at 50% 40%,#000 30%,transparent 88%)}
.right-head{display:inline-flex;align-items:center;gap:9px;align-self:flex-start;height:34px;padding:0 16px 0 13px;border-radius:100px;font-size:13px;font-weight:500;color:#fff;
  background:linear-gradient(180deg,rgba(255,255,255,.12),rgba(255,255,255,.04));border:1px solid rgba(255,255,255,.16);box-shadow:0 1px 0 rgba(255,255,255,.18) inset}
.right-head i{width:8px;height:8px;border-radius:50%;background:var(--good);box-shadow:0 0 0 3px rgba(16,185,129,.25),0 0 10px rgba(16,185,129,.8)}
.right h2{font-size:clamp(34px,3.6vw,54px);font-weight:800;letter-spacing:-.04em;line-height:1.1;margin-bottom:18px}
.right h2 em,.right h2 .hl{display:block;font-style:normal;font-weight:800;color:var(--accent);text-shadow:0 0 40px rgba(212,255,62,.35)}
.right p{font-size:16px;font-weight:300;color:rgba(255,255,255,.82);max-width:480px;line-height:1.75;margin-bottom:30px}
/* หน้าจอแชทตัวอย่าง = การ์ดแก้วพื้นดำ */
.preview-card{position:relative;max-width:420px;padding:18px;border-radius:22px;background:linear-gradient(180deg,rgba(255,255,255,.07),rgba(255,255,255,.02));border:1px solid rgba(255,255,255,.12);
  box-shadow:0 1px 0 rgba(255,255,255,.12) inset,0 40px 80px -30px rgba(0,0,0,.8);-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px)}
.preview-card::before{content:"";position:absolute;top:0;left:18%;right:18%;height:1px;background:linear-gradient(90deg,transparent,rgba(212,255,62,.85),transparent);opacity:.7}
.pc-head{display:flex;align-items:center;gap:10px;padding-bottom:12px;border-bottom:1px solid rgba(255,255,255,.08);margin-bottom:14px}
.pc-av{width:34px;height:34px;background:#FCA311;border-radius:50%;display:grid;place-items:center;color:#fff;font-weight:700;font-size:12px;position:relative;flex-shrink:0}
.pc-av .ch{position:absolute;bottom:-2px;right:-2px;width:15px;height:15px;border-radius:50%;background:#06C755;display:grid;place-items:center;color:#fff;font-size:8px;border:2px solid var(--ink)}
.pc-name{font-weight:700;font-size:13.5px}
.pc-meta{display:flex;align-items:center;gap:6px;font-size:11.5px;color:rgba(255,255,255,.65)}
.pc-meta::before{content:"";width:6px;height:6px;border-radius:50%;background:var(--good)}
.pc-msg{display:inline-block;max-width:85%;padding:10px 13px;background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.08);border-radius:14px 14px 14px 4px;font-size:13px;margin-bottom:8px}
.pc-msg.out{background:var(--accent);color:var(--ink);border-color:var(--accent);border-radius:14px 14px 4px 14px;font-weight:500}
.pc-tag{display:inline-flex;align-items:center;gap:6px;padding:5px 11px;border-radius:100px;font-size:11px;font-weight:600;color:var(--accent);background:rgba(212,255,62,.1);border:1px solid rgba(212,255,62,.28);margin-top:4px}
.pc-tag i{font-size:14px}
.pc-typing{display:inline-flex;gap:3px;margin-left:2px}
.pc-typing b{width:4px;height:4px;border-radius:50%;background:currentColor;animation:authDot 1.2s infinite}
.pc-typing b:nth-child(2){animation-delay:.15s}.pc-typing b:nth-child(3){animation-delay:.3s}
@keyframes authDot{0%,60%,100%{opacity:.25}30%{opacity:1}}
/* ตัวเลข = การ์ดแก้ว (แบบ .hm-figures) */
.right-foot{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px}
.right-foot>div{position:relative;overflow:hidden;padding:16px 18px;border-radius:18px;font-size:12.5px;color:rgba(255,255,255,.72);
  background:linear-gradient(180deg,rgba(255,255,255,.055),rgba(255,255,255,.015));border:1px solid rgba(255,255,255,.09);box-shadow:0 1px 0 rgba(255,255,255,.08) inset}
.right-foot>div::before{content:"";position:absolute;top:0;left:18%;right:18%;height:1px;background:linear-gradient(90deg,transparent,rgba(212,255,62,.85),transparent);opacity:.55}
.right-foot strong{display:block;margin-bottom:2px;font-size:26px;font-weight:700;letter-spacing:-.035em;color:#fff;font-variant-numeric:tabular-nums}
/* signup: รายการจุดเด่น */
.benefits{list-style:none;display:flex;flex-direction:column;gap:12px;max-width:520px}
.benefits li{display:flex;align-items:center;gap:14px;padding:12px 14px;border-radius:16px;font-size:14.5px;color:#fff;
  background:linear-gradient(180deg,rgba(255,255,255,.05),rgba(255,255,255,.01));border:1px solid rgba(255,255,255,.08)}
.benefits li i{width:38px;height:38px;flex-shrink:0;border-radius:12px;display:grid;place-items:center;font-size:19px;color:var(--accent);
  background:linear-gradient(145deg,rgba(212,255,62,.16),rgba(212,255,62,.03));border:1px solid rgba(212,255,62,.28);box-shadow:0 0 20px -6px rgba(212,255,62,.45)}

/* layout กลางจอ (ตั้งจาก Login Settings) */
.layout-center{grid-template-columns:minmax(0,1fr)!important}
.layout-center .right{display:none}
.layout-center .left{align-items:center}
.layout-center .brand{align-self:center}
.layout-center .login-wrap{margin:auto}

@media (max-width:980px){
  body{grid-template-columns:minmax(0,1fr)}
  .right{display:none}
  .left{padding:28px 20px;align-items:center}
  .brand{align-self:center}
  .field-input input{font-size:16px !important}
}
@media (max-width:420px){
  .signup-cta{flex-direction:column;align-items:stretch;border-radius:22px;padding:16px;text-align:center}
  .btn-signup{justify-content:center}
}
@media (prefers-reduced-motion:reduce){
  .btn-full,.btn-signup,.btn-social,.btn-full .bx-right-arrow-alt{transition:none}
  .btn-full:hover,.btn-signup:hover,.btn-social:hover{transform:none}
  .pc-typing b{animation:none;opacity:.7}
}