Cards: appearance follows wear, hash depends on fan and contacts, seller confrontation

Fan, contact and scratch levels are recomputed from health and a per-card
seed, so a card looks older as it wears. Fan and contacts scale hashrate.
Each inspection-tray detail now maps to exactly one dimension value. Quoting
dealers price the card as if its condition were fine; the player points out
fan, contacts, bracket, print or sticker in the tray to take the matching
discount or expose a fake (a wrong accusation costs reputation like the
vanilla confrontation). Unowned cards show a coarse grade and rated specs.

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

src/Decentralized.Domain/CardLook.cs

@@ -22,6 +22,36 @@ namespace Decentralized.Domain
 
         public const int Variants = 3;
 
+        /// <summary>每张卡自己的随机种子：老化类维度（风扇、金手指、挡板划痕）由它和当前健康度决定，每晚损耗后重新算，
+        /// 所以越旧的卡看着越旧。为 0 时表示外观是写死的（测试用）。</summary>
+        public uint Seed;
+
+        private static double U(uint seed, int salt)
+        {
+            uint x = seed * 2654435761u + (uint)salt * 40503u + 12345u;
+            x ^= x >> 15; x *= 2246822519u; x ^= x >> 13; x *= 3266489917u; x ^= x >> 16;
+            return (x >> 8) * (1.0 / (1 << 24));
+        }
+
+        /// <summary>按当前健康度重新算出的外观：磨损度 = 1 − 健康度 / 100，再加上这张卡自己的偏差（±0.15）。
+        /// 风扇磨损 ≥ 0.25 积灰、≥ 0.55 缺角；金手指 ≥ 0.30 发暗、≥ 0.60 氧化；挡板磨损 ≥ 0.45 出划痕（接口数不对是假卡的固定特征，不变）。</summary>
+        public CardLook Appearance(double health)
+        {
+            if (Seed == 0) return this;
+            double worn = 1 - Math.Max(0, Math.Min(100, health)) / 100.0;
+            var l = this;
+            double fan = worn + (U(Seed, 1) - 0.5) * 0.3, fin = worn + (U(Seed, 2) - 0.5) * 0.3, brk = worn + (U(Seed, 3) - 0.5) * 0.3;
+            l.Fan = fan >= 0.55 ? 2 : fan >= 0.25 ? 1 : 0;
+            l.Fingers = fin >= 0.60 ? 2 : fin >= 0.30 ? 1 : 0;
+            if (Bracket != 2) l.Bracket = brk >= 0.45 ? 1 : 0;
+            return l;
+        }
+
+        private static readonly double[] FanHash = { 1.00, 0.97, 0.92 }, FingerHash = { 1.00, 0.98, 0.94 };
+
+        /// <summary>算力倍数：风扇积灰 ×0.97、缺角 ×0.92（降频）；金手指发暗 ×0.98、氧化 ×0.94（接触不良掉速）。</summary>
+        public double HashFactor => FanHash[Fan] * FingerHash[Fingers];
+
         /// <summary>五位数字，存在物品标签上：风扇、金手指、挡板、丝印、贴纸。</summary>
         public string Encode() => $"{Fan}{Fingers}{Bracket}{Print}{Sticker}";
 
@@ -37,7 +67,15 @@ namespace Decentralized.Domain
         private static readonly double[] FingerValue = { 1.00, 0.96, 0.88 }, FingerDeath = { 1.00, 1.10, 1.30 };
 
         /// <summary>外观对价值的折扣：风扇积灰 −4%、缺角 −12%；金手指发暗 −4%、氧化 −12%；挡板划痕 −2%；封条缺失（开过封）−6%。</summary>
-        public double ValueFactor => FanValue[Fan] * FingerValue[Fingers] * (Bracket == 1 ? 0.98 : 1.0) * (Sticker == 2 ? 0.94 : 1.0);
+        public double ValueFactor => ValueFactorOf(AllDims);
+
+        /// <summary>外观折扣的维度位：1 风扇、2 金手指、4 挡板划痕、8 封条缺失。</summary>
+        public const int DimFan = 1, DimFingers = 2, DimScratch = 4, DimSeal = 8, AllDims = 15;
+
+        /// <summary>只计入 mask 里的维度的折扣：贩子报价时先装作这些问题都没有，玩家指出一项才扣一项。</summary>
+        public double ValueFactorOf(int mask) =>
+            ((mask & DimFan) != 0 ? FanValue[Fan] : 1.0) * ((mask & DimFingers) != 0 ? FingerValue[Fingers] : 1.0)
+            * ((mask & DimScratch) != 0 && Bracket == 1 ? 0.98 : 1.0) * ((mask & DimSeal) != 0 && Sticker == 2 ? 0.94 : 1.0);
 
         /// <summary>每晚损耗倍数：风扇积灰散热差 ×1.1，缺角 ×1.3。</summary>
         public double WearFactor => FanWear[Fan];
@@ -54,36 +92,29 @@ namespace Decentralized.Domain
         /// </summary>
         public static CardLook Generate(Rng rng, double health, bool fake)
         {
-            double worn = 1 - Math.Max(0, Math.Min(100, health)) / 100.0;
-            var look = new CardLook
+            var look = new CardLook { Seed = rng.NextUInt() | 1, Sticker = rng.Chance(fake ? 0.35 : 0.15 + 0.30 * (1 - Math.Max(0, Math.Min(100, health)) / 100.0)) ? 2 : 0 };
+            if (fake)
             {
-                Fan = Pick(rng, 0.10 + 0.55 * worn, 0.35 * worn),
-                Fingers = Pick(rng, 0.08 + 0.55 * worn, 0.40 * worn),
-                Bracket = rng.Chance(0.10 + 0.50 * worn) ? 1 : 0,
-                Sticker = rng.Chance(fake ? 0.35 : 0.15 + 0.30 * worn) ? 2 : 0,
-            };
-            if (!fake) return look;
-            int signs = rng.Chance(0.55) ? 1 : rng.Chance(0.6) ? 2 : 3;
-            var order = new[] { 0, 1, 2 };
-            for (int i = order.Length - 1; i > 0; i--)
-            {
-                int j = rng.Range(0, i);
-                (order[i], order[j]) = (order[j], order[i]);
-            }
-            for (int k = 0; k < signs; k++)
-            {
-                switch (order[k])
+                int signs = rng.Chance(0.55) ? 1 : rng.Chance(0.6) ? 2 : 3;
+                var order = new[] { 0, 1, 2 };
+                for (int i = order.Length - 1; i > 0; i--)
                 {
-                    case 0: look.Bracket = 2; break;
-                    case 1: look.Print = rng.Chance(0.6) ? 1 : 2; break;
-                    default: look.Sticker = 1; break;
+                    int j = rng.Range(0, i);
+                    (order[i], order[j]) = (order[j], order[i]);
+                }
+                for (int k = 0; k < signs; k++)
+                {
+                    switch (order[k])
+                    {
+                        case 0: look.Bracket = 2; break;
+                        case 1: look.Print = rng.Chance(0.6) ? 1 : 2; break;
+                        default: look.Sticker = 1; break;
+                    }
                 }
             }
-            return look;
+            return look.Appearance(health);
         }
 
-        /// <summary>p1 的概率取 1，再以 p2 的概率升到 2。</summary>
-        private static int Pick(Rng rng, double p1, double p2) => rng.Chance(p1) ? (rng.Chance(p2 / Math.Max(p1, 1e-9)) ? 2 : 1) : 0;
     }
 
     /// <summary>
@@ -101,7 +132,21 @@ namespace Decentralized.Domain
         }
 
         /// <summary>真实价值（芯片型号 + 健康度 + 外观折扣）。</summary>
-        public static long True(Unit u) => Math.Max(1, (long)Math.Round(Of(u.FakeOf ?? u.Model, u.Health) * u.Look.ValueFactor));
+        public static long True(Unit u) => Math.Max(1, (long)Math.Round(Of(u.FakeOf ?? u.Model, u.Health) * u.Appearance.ValueFactor));
+
+        public const double ScamDiscount = 0.90;
+
+        /// <summary>
+        /// 贩子的报价：装作成色没问题（外观折扣只计玩家已指出的维度），在此之上加价 markupPct%。
+        /// 没拆穿的假卡按标称型号的价再打九折；拆穿之后按真实芯片算，和真卡一样。
+        /// </summary>
+        public static long Quote(Unit u, int markupPct, int pointedDims, bool exposed)
+        {
+            bool fakeHidden = u.FakeOf != null && !exposed;
+            double v = Of(fakeHidden ? u.Model : (u.FakeOf ?? u.Model), u.Health) * u.Appearance.ValueFactorOf(pointedDims);
+            v *= fakeHidden ? ScamDiscount : 1 + markupPct / 100.0;
+            return Math.Max(1, (long)Math.Round(v));
+        }
 
         /// <summary>标称价：贩子报的价，按标称型号算；二手卡也折旧，但只按贩子"自称"的健康度。</summary>
         public static long Quoted(Unit u, double claimedHealth) => Of(u.Model, claimedHealth);