diff --git a/frontend/web_app/src/pages/HomePage.jsx b/frontend/web_app/src/pages/HomePage.jsx
index bfa2a0a..fb15c22 100644
--- a/frontend/web_app/src/pages/HomePage.jsx
+++ b/frontend/web_app/src/pages/HomePage.jsx
@@ -17,6 +17,8 @@ import {
 import {
   alignDesignCurveToActualCurve,
   buildPowerCurveModel,
+  getAxisMaximum,
+  getAxisTicks,
   getDrawableActualCurve,
   hasDrawablePowerCurveData,
 } from '../utils/powerCurveModel';
@@ -159,8 +161,8 @@ const DEFAULT_CHART_OPTIONS = {
   show_legend: true,
   show_filtered: false,
   scatter_size: 2,
-  x_tick_interval: '',
-  y_tick_interval: '',
+  x_tick_interval: '1',
+  y_tick_interval: '200',
   scatter_color: '#2563eb',
   scatter_opacity: 42,
   show_scatter: true,
@@ -199,6 +201,12 @@ function normalizeChartOptions(options = {}) {
     ...DEFAULT_CHART_OPTIONS,
     ...currentOptions,
     text_scale: getTextScale(textScale),
+    x_tick_interval: Number(currentOptions.x_tick_interval) > 0
+      ? currentOptions.x_tick_interval
+      : DEFAULT_CHART_OPTIONS.x_tick_interval,
+    y_tick_interval: Number(currentOptions.y_tick_interval) > 0
+      ? currentOptions.y_tick_interval
+      : DEFAULT_CHART_OPTIONS.y_tick_interval,
   };
 }
 
@@ -738,39 +746,6 @@ function drawSmoothLine(context, points, toX, toY, style) {
   context.restore();
 }
 
-function getPositiveTickInterval(value) {
-  const interval = Number(value);
-  return Number.isFinite(interval) && interval > 0 ? interval : null;
-}
-
-function getNiceTickInterval(min, max) {
-  const range = Math.max(Math.abs(max - min), 1);
-  const raw = range / 8;
-  const magnitude = 10 ** Math.floor(Math.log10(raw));
-  const normalized = raw / magnitude;
-  const factor = normalized <= 1 ? 1 : normalized <= 2 ? 2 : normalized <= 5 ? 5 : 10;
-  return factor * magnitude;
-}
-
-function resolveTickInterval(min, max, configuredInterval) {
-  return getPositiveTickInterval(configuredInterval) || getNiceTickInterval(min, max);
-}
-
-function getAxisMaximum(max, configuredInterval) {
-  const interval = resolveTickInterval(0, max, configuredInterval);
-  return Math.max(interval, Math.ceil(Math.max(max, 0) / interval) * interval);
-}
-
-function getAxisTicks(min, max, configuredInterval) {
-  const interval = resolveTickInterval(min, max, configuredInterval);
-  const first = Math.ceil((min - 1e-9) / interval) * interval;
-  const ticks = [];
-  for (let value = first; value <= max + interval * 1e-6 && ticks.length < 120; value += interval) {
-    ticks.push(Number(value.toFixed(10)));
-  }
-  return ticks;
-}
-
 function formatTick(value) {
   if (!Number.isFinite(value)) return '';
   return Math.abs(value) >= 100 || Number.isInteger(value) ? value.toFixed(0) : value.toFixed(2).replace(/0+$/, '').replace(/\.$/, '');
@@ -840,6 +815,23 @@ function renderPowerCurvePng({ actualCurve, designCurve, scatterPoints, filtered
   context.strokeStyle = gridColor;
   context.lineWidth = 1;
   context.strokeRect(padding.left, padding.top, plotWidth, plotHeight);
+  context.strokeStyle = '#94a3b8';
+  context.lineWidth = 2;
+  const inwardTickSize = 10;
+  for (const xValue of getAxisTicks(xMin, xMax, options.x_tick_interval)) {
+    const x = toX(xValue);
+    context.beginPath();
+    context.moveTo(x, padding.top + plotHeight);
+    context.lineTo(x, padding.top + plotHeight - inwardTickSize);
+    context.stroke();
+  }
+  for (const yValue of getAxisTicks(yMin, yMax, options.y_tick_interval)) {
+    const y = toY(yValue);
+    context.beginPath();
+    context.moveTo(padding.left, y);
+    context.lineTo(padding.left + inwardTickSize, y);
+    context.stroke();
+  }
   context.fillStyle = textColor;
   for (const xValue of getAxisTicks(xMin, xMax, options.x_tick_interval)) {
     context.textAlign = 'center';
@@ -1353,7 +1345,7 @@ function PowerCurveChart({
           label: activeChartOptions.x_axis_label,
           stroke: activeChartOptions.text_color,
           size: xAxisSize,
-          gap: 8,
+          gap: 18,
           labelSize: axisLabelSize,
           labelGap: 10,
           font: `${screenTypography.tick}px "Segoe UI", sans-serif`,
@@ -1361,12 +1353,13 @@ function PowerCurveChart({
           splits: (u, axisIdx, min, max) => getAxisTicks(min, max, activeChartOptions.x_tick_interval),
           values: (u, splits) => splits.map(formatTick),
           grid: { show: activeChartOptions.show_grid, stroke: '#d8e0ea', width: 1 },
+          ticks: { show: true, stroke: '#94a3b8', width: 1, size: -8 },
         },
         {
           label: activeChartOptions.y_axis_label,
           stroke: activeChartOptions.text_color,
           size: yAxisSize,
-          gap: 8,
+          gap: 18,
           labelSize: axisLabelSize,
           labelGap: 10,
           font: `${screenTypography.tick}px "Segoe UI", sans-serif`,
@@ -1374,6 +1367,7 @@ function PowerCurveChart({
           splits: (u, axisIdx, min, max) => getAxisTicks(min, max, activeChartOptions.y_tick_interval),
           values: (u, splits) => splits.map(formatTick),
           grid: { show: activeChartOptions.show_grid, stroke: '#d8e0ea', width: 1 },
+          ticks: { show: true, stroke: '#94a3b8', width: 1, size: -8 },
         },
       ],
       series: [
@@ -3000,23 +2994,23 @@ export default function HomePage({ activeSection = 'settings' }) {
                   <b>{chartOptions.scatter_size}</b>
                 </label>
                 <label>
-                  <span>X 轴刻度</span>
+                  <span>X 轴网格间隔</span>
                   <input
                     type="number"
                     min="0.001"
                     step="any"
-                    placeholder="自动"
+                    placeholder="请输入间隔"
                     value={chartOptions.x_tick_interval}
                     onChange={(event) => handleChartOptionChange('x_tick_interval', event.target.value)}
                   />
                 </label>
                 <label>
-                  <span>Y 轴刻度</span>
+                  <span>Y 轴网格间隔</span>
                   <input
                     type="number"
                     min="0.001"
                     step="any"
-                    placeholder="自动"
+                    placeholder="请输入间隔"
                     value={chartOptions.y_tick_interval}
                     onChange={(event) => handleChartOptionChange('y_tick_interval', event.target.value)}
                   />
diff --git a/frontend/web_app/src/pages/LoginPage.module.css b/frontend/web_app/src/pages/LoginPage.module.css
index 989cf8b..a9fc426 100644
--- a/frontend/web_app/src/pages/LoginPage.module.css
+++ b/frontend/web_app/src/pages/LoginPage.module.css
@@ -5,7 +5,7 @@
   align-items: center;
   justify-content: center;
   height: 100vh;
-  background: #080812;
+  background: linear-gradient(145deg, #f8fbff 0%, #eef4ff 48%, #f5f3ff 100%);
   overflow: hidden;
 }
 
@@ -14,6 +14,8 @@
   position: absolute;
   inset: 0;
   z-index: 0;
+  opacity: 0.46;
+  filter: invert(1) hue-rotate(180deg) saturate(0.8);
 }
 
 /* ─── 中心径向辉光 ─── */
@@ -23,10 +25,10 @@
   z-index: 1;
   background:
     radial-gradient(ellipse 60% 50% at 50% 50%,
-      rgba(99, 102, 241, 0.08) 0%,
+      rgba(99, 102, 241, 0.12) 0%,
       transparent 70%),
     radial-gradient(ellipse 40% 30% at 50% 45%,
-      rgba(139, 92, 246, 0.06) 0%,
+      rgba(139, 92, 246, 0.08) 0%,
       transparent 60%);
   pointer-events: none;
 }
@@ -44,7 +46,7 @@
   position: absolute;
   bottom: -10px;
   border-radius: 50%;
-  background: #818cf8;
+  background: #6366f1;
   filter: blur(1px);
   animation: floatUp linear infinite;
 }
@@ -71,15 +73,15 @@
   position: relative;
   z-index: 10;
   width: 400px;
-  background: rgba(18, 18, 30, 0.75);
-  border: 1px solid rgba(99, 102, 241, 0.15);
+  background: rgba(255, 255, 255, 0.86);
+  border: 1px solid rgba(148, 163, 184, 0.3);
   border-radius: 16px;
   padding: 44px 36px 32px;
-  backdrop-filter: blur(20px) saturate(1.4);
+  backdrop-filter: blur(22px) saturate(1.2);
   box-shadow:
     0 0 60px rgba(99, 102, 241, 0.08),
-    0 0 120px rgba(139, 92, 246, 0.04),
-    0 24px 48px rgba(0, 0, 0, 0.5);
+    0 0 120px rgba(139, 92, 246, 0.05),
+    0 24px 60px rgba(51, 65, 85, 0.16);
   animation: cardEnter 0.8s ease-out;
 }
 
@@ -139,7 +141,7 @@
   font-weight: 700;
   text-align: center;
   margin: 0 0 6px;
-  background: linear-gradient(135deg, #e0e7ff, #c7d2fe, #a5b4fc);
+  background: linear-gradient(135deg, #1e3a8a, #4f46e5, #7c3aed);
   -webkit-background-clip: text;
   -webkit-text-fill-color: transparent;
   background-clip: text;
@@ -148,7 +150,7 @@
 
 .subtitle {
   font-size: 16px;
-  color: #6b7280;
+  color: #64748b;
   text-align: center;
   margin: 16px 0 22px;
   letter-spacing: 6px;
@@ -162,7 +164,7 @@
 .label {
   display: block;
   font-size: 15px;
-  color: #8b8fa3;
+  color: #475569;
   margin-bottom: 8px;
   letter-spacing: 0.5px;
 }
@@ -170,10 +172,10 @@
 .input {
   width: 100%;
   padding: 11px 14px;
-  background: rgba(20, 20, 36, 0.8);
-  border: 1px solid rgba(99, 102, 241, 0.12);
+  background: rgba(248, 250, 252, 0.92);
+  border: 1px solid #cbd5e1;
   border-radius: 8px;
-  color: #d1d5db;
+  color: #0f172a;
   font-size: 17px;
   outline: none;
   transition: all 0.2s ease;
@@ -181,13 +183,13 @@
 }
 
 .input:focus {
-  border-color: rgba(99, 102, 241, 0.5);
-  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.08);
-  background: rgba(20, 20, 36, 1);
+  border-color: #818cf8;
+  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.12);
+  background: #ffffff;
 }
 
 .input::placeholder {
-  color: #4a4e5a;
+  color: #94a3b8;
 }
 
 .inputWrap {
@@ -207,7 +209,7 @@
   border: none;
   padding: 4px;
   cursor: pointer;
-  color: #4a4e5a;
+  color: #64748b;
   display: flex;
   align-items: center;
   justify-content: center;
@@ -221,12 +223,12 @@
 /* ─── 错误提示 ─── */
 .error {
   font-size: 13px;
-  color: #f87171;
+  color: #b91c1c;
   margin-bottom: 16px;
   text-align: center;
   padding: 8px 12px;
-  background: rgba(239, 68, 68, 0.06);
-  border: 1px solid rgba(239, 68, 68, 0.15);
+  background: #fff1f2;
+  border: 1px solid #fecaca;
   border-radius: 6px;
 }
 
@@ -298,6 +300,6 @@
 
 .footerText {
   font-size: 13px;
-  color: #4a4e5a;
+  color: #64748b;
   letter-spacing: 1px;
 }
diff --git a/frontend/web_app/src/utils/powerCurveModel.js b/frontend/web_app/src/utils/powerCurveModel.js
index bdb161b..56e245a 100644
--- a/frontend/web_app/src/utils/powerCurveModel.js
+++ b/frontend/web_app/src/utils/powerCurveModel.js
@@ -4,6 +4,30 @@ function validNumber(value) {
   return Number.isFinite(value);
 }
 
+function getPositiveTickInterval(value) {
+  const interval = Number(value);
+  return Number.isFinite(interval) && interval > 0 ? interval : null;
+}
+
+export function resolveTickInterval(configuredInterval, fallbackInterval = 1) {
+  return getPositiveTickInterval(configuredInterval) || fallbackInterval;
+}
+
+export function getAxisMaximum(max, configuredInterval) {
+  const interval = resolveTickInterval(configuredInterval);
+  return Math.max(interval, Math.ceil(Math.max(max, 0) / interval) * interval);
+}
+
+export function getAxisTicks(min, max, configuredInterval) {
+  const interval = resolveTickInterval(configuredInterval);
+  const first = Math.ceil((min - 1e-9) / interval) * interval;
+  const ticks = [];
+  for (let value = first; value <= max + interval * 1e-6 && ticks.length < 120; value += interval) {
+    ticks.push(Number(value.toFixed(10)));
+  }
+  return ticks;
+}
+
 export function normalizeDesignCurve(points = []) {
   const grouped = new Map();
   for (const point of points) {
diff --git a/frontend/web_app/src/utils/powerCurveModel.test.js b/frontend/web_app/src/utils/powerCurveModel.test.js
index 41e8ef7..1534d4c 100644
--- a/frontend/web_app/src/utils/powerCurveModel.test.js
+++ b/frontend/web_app/src/utils/powerCurveModel.test.js
@@ -2,6 +2,7 @@ import assert from 'node:assert/strict';
 import test from 'node:test';
 import {
   buildActualCurveFromDesign,
+  getAxisTicks,
   getDrawableActualCurve,
   hasDrawablePowerCurveData,
 } from './powerCurveModel.js';
@@ -32,6 +33,14 @@ test('getDrawableActualCurve skips empty design bins and keeps adjacent valid po
   );
 });
 
+test('uses configured grid intervals exactly', () => {
+  assert.deepEqual(
+    getAxisTicks(0, 2, 0.5),
+    [0, 0.5, 1, 1.5, 2],
+  );
+  assert.deepEqual(getAxisTicks(0, 800, 200), [0, 200, 400, 600, 800]);
+});
+
 test('allows a chart to render when only scatter points are available', () => {
   assert.equal(hasDrawablePowerCurveData({
     actualCurve: [],