diff --git a/src/components/MobileSheet.css b/src/components/MobileSheet.css
new file mode 100644
index 0000000..767145a
--- /dev/null
+++ b/src/components/MobileSheet.css
@@ -0,0 +1,125 @@
+/* MobileSheet — bottom sheet modal */
+
+/* Backdrop */
+.mobile-sheet__backdrop {
+  position: fixed;
+  inset: 0;
+  background: rgba(0, 0, 0, 0.6);
+  backdrop-filter: blur(4px);
+  -webkit-backdrop-filter: blur(4px);
+  z-index: 400;
+  opacity: 0;
+  pointer-events: none;
+  transition: opacity 0.25s var(--ease-out);
+}
+
+.mobile-sheet__backdrop.is-open {
+  opacity: 1;
+  pointer-events: auto;
+}
+
+/* Sheet */
+.mobile-sheet {
+  position: fixed;
+  bottom: 0;
+  left: 0;
+  right: 0;
+  max-height: 90vh;
+  background: var(--bg-secondary);
+  border-top: 1px solid var(--border-line);
+  border-radius: var(--radius-xl) var(--radius-xl) 0 0;
+  z-index: 401;
+  display: flex;
+  flex-direction: column;
+  touch-action: none;
+  transform: translateY(100%);
+  transition: transform 0.3s var(--ease-out);
+}
+
+.mobile-sheet.is-open {
+  transform: translateY(0);
+}
+
+/* Snap variants */
+.mobile-sheet.snap-half {
+  max-height: 50vh;
+}
+
+/* Drag handle area */
+.mobile-sheet__handle {
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  padding: 12px 0 8px;
+  cursor: grab;
+  flex-shrink: 0;
+}
+
+.mobile-sheet__handle:active {
+  cursor: grabbing;
+}
+
+.mobile-sheet__handle-bar {
+  display: block;
+  width: 36px;
+  height: 4px;
+  background: var(--text-muted);
+  border-radius: 2px;
+}
+
+/* Header */
+.mobile-sheet__header {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  padding: 0 20px 12px;
+  border-bottom: 1px solid var(--border-line);
+  flex-shrink: 0;
+}
+
+.mobile-sheet__title {
+  font-family: var(--font-display);
+  font-size: 16px;
+  font-weight: 600;
+  color: var(--text-bright);
+}
+
+.mobile-sheet__close {
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  min-width: 44px;
+  min-height: 44px;
+  background: none;
+  border: none;
+  color: var(--text-dim);
+  cursor: pointer;
+  border-radius: var(--radius-sm);
+  -webkit-tap-highlight-color: transparent;
+  transition: color 0.18s var(--ease-out);
+}
+
+.mobile-sheet__close:hover {
+  color: var(--text-default);
+}
+
+/* Scrollable body */
+.mobile-sheet__body {
+  flex: 1;
+  overflow-y: auto;
+  padding: 16px 20px;
+  padding-bottom: calc(16px + var(--safe-area-bottom));
+  overscroll-behavior: contain;
+}
+
+/* Reduced motion */
+@media (prefers-reduced-motion: reduce) {
+  .mobile-sheet__backdrop,
+  .mobile-sheet {
+    transition: none;
+  }
+
+  .mobile-sheet__close {
+    transition: none;
+  }
+}
diff --git a/src/components/MobileSheet.jsx b/src/components/MobileSheet.jsx
new file mode 100644
index 0000000..59b238b
--- /dev/null
+++ b/src/components/MobileSheet.jsx
@@ -0,0 +1,113 @@
+import { useEffect, useRef, useState } from 'react';
+import './MobileSheet.css';
+
+export default function MobileSheet({ open, onClose, title, snap = 'full', children }) {
+  const [dragY, setDragY] = useState(0);
+  const [isDragging, setIsDragging] = useState(false);
+  const startYRef = useRef(null);
+  const sheetRef = useRef(null);
+
+  // Lock body scroll when open
+  useEffect(() => {
+    if (open) {
+      document.body.style.overflow = 'hidden';
+    } else {
+      document.body.style.overflow = '';
+    }
+    return () => {
+      document.body.style.overflow = '';
+    };
+  }, [open]);
+
+  // Reset drag state on close
+  useEffect(() => {
+    if (!open) {
+      setDragY(0);
+      setIsDragging(false);
+    }
+  }, [open]);
+
+  const handleHandleTouchStart = (e) => {
+    startYRef.current = e.touches[0].clientY;
+    setIsDragging(true);
+  };
+
+  const handleHandleTouchMove = (e) => {
+    if (startYRef.current === null) return;
+    const delta = e.touches[0].clientY - startYRef.current;
+    if (delta < 0) return; // no drag up
+    setDragY(delta);
+  };
+
+  const handleHandleTouchEnd = () => {
+    setIsDragging(false);
+    if (dragY > 100) {
+      setDragY(0);
+      onClose?.();
+    } else {
+      setDragY(0);
+    }
+    startYRef.current = null;
+  };
+
+  const sheetTransform = open
+    ? `translateY(${isDragging ? dragY : 0}px)`
+    : 'translateY(100%)';
+
+  return (
+    <>
+      <div
+        className={`mobile-sheet__backdrop ${open ? 'is-open' : ''}`}
+        onClick={onClose}
+        aria-hidden="true"
+      />
+      <div
+        ref={sheetRef}
+        className={`mobile-sheet snap-${snap} ${open ? 'is-open' : ''}`}
+        style={{
+          transform: sheetTransform,
+          transition: isDragging ? 'none' : undefined,
+        }}
+        role="dialog"
+        aria-modal="true"
+        aria-label={title}
+      >
+        {/* Drag handle */}
+        <div
+          className="mobile-sheet__handle"
+          onTouchStart={handleHandleTouchStart}
+          onTouchMove={handleHandleTouchMove}
+          onTouchEnd={handleHandleTouchEnd}
+          aria-hidden="true"
+        >
+          <span className="mobile-sheet__handle-bar" />
+        </div>
+
+        {/* Header */}
+        <div className="mobile-sheet__header">
+          <span className="mobile-sheet__title">{title}</span>
+          <button
+            type="button"
+            className="mobile-sheet__close"
+            onClick={onClose}
+            aria-label="닫기"
+          >
+            <svg width="18" height="18" viewBox="0 0 18 18" fill="none" aria-hidden="true">
+              <path
+                d="M3 3l12 12M15 3L3 15"
+                stroke="currentColor"
+                strokeWidth="1.8"
+                strokeLinecap="round"
+              />
+            </svg>
+          </button>
+        </div>
+
+        {/* Body */}
+        <div className="mobile-sheet__body">
+          {children}
+        </div>
+      </div>
+    </>
+  );
+}