Headless Login 데모 앱 초기 구현 및 Mock API 구축

public/styles.css

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+:root {
+    color: #132238;
+    background:
+        radial-gradient(circle at top, rgba(180, 202, 224, 0.45), transparent 35%),
+        linear-gradient(180deg, #edf3f8 0%, #f7fafc 100%);
+    font-family: 'Segoe UI', 'Noto Sans KR', sans-serif;
+    line-height: 1.5;
+    font-weight: 400;
+}
+
+* {
+    box-sizing: border-box;
+}
+
+body {
+    margin: 0;
+    min-width: 320px;
+    min-height: 100vh;
+}
+
+button,
+input {
+    font: inherit;
+}
+
+.app-shell {
+    display: grid;
+    place-items: center;
+    min-height: 100vh;
+    padding: 48px 24px;
+}
+
+.login-panel {
+    width: min(100%, 560px);
+    padding: 40px;
+    border: 1px solid rgba(84, 111, 138, 0.18);
+    border-radius: 28px;
+    background: rgba(255, 255, 255, 0.9);
+    box-shadow: 0 32px 80px rgba(32, 55, 79, 0.12);
+}
+
+.panel-heading h1 {
+    margin: 0;
+    font-size: clamp(2rem, 3vw, 2.8rem);
+    line-height: 1.05;
+}
+
+.panel-heading p {
+    margin: 12px 0 0;
+    color: #516b86;
+}
+
+.login-form {
+    display: grid;
+    gap: 16px;
+    margin-top: 28px;
+}
+
+.field {
+    display: grid;
+    gap: 8px;
+}
+
+.field label {
+    color: #1c3954;
+    font-size: 0.96rem;
+    font-weight: 700;
+}
+
+.text-input {
+    width: 100%;
+    padding: 16px 18px;
+    border: 1px solid rgba(96, 123, 149, 0.24);
+    border-radius: 18px;
+    background: #fdfefe;
+    color: #132238;
+    transition: all 160ms ease;
+}
+
+.text-input:focus {
+    outline: none;
+    border-color: #2f5f8f;
+    box-shadow: 0 0 0 4px rgba(93, 137, 181, 0.14);
+    transform: translateY(-1px);
+}
+
+.input-hint {
+    margin: 0;
+    min-height: 24px;
+    color: #5c748d;
+    font-size: 0.95rem;
+}
+
+.primary-button {
+    display: inline-flex;
+    align-items: center;
+    justify-content: center;
+    min-height: 54px;
+    padding: 0 20px;
+    border: 0;
+    border-radius: 18px;
+    background: linear-gradient(180deg, #214e77 0%, #15395b 100%);
+    color: #f8fbff;
+    font-weight: 700;
+    cursor: pointer;
+    box-shadow: 0 20px 40px rgba(22, 57, 92, 0.24);
+    transition: all 160ms ease;
+}
+
+.primary-button:hover:not(:disabled) {
+    transform: translateY(-1px);
+    box-shadow: 0 24px 44px rgba(22, 57, 92, 0.3);
+}
+
+.primary-button:disabled {
+    cursor: not-allowed;
+    opacity: 0.54;
+    box-shadow: none;
+}
+
+.status-card,
+.success-panel {
+    margin-top: 24px;
+    padding: 20px 22px;
+    border-radius: 22px;
+    border: 1px solid rgba(96, 123, 149, 0.18);
+}
+
+.status-card {
+    background: #f6f9fb;
+}
+
+.status-card strong {
+    display: block;
+    margin-bottom: 8px;
+    color: #18334d;
+}
+
+.status-card p,
+.success-panel p {
+    margin: 0;
+    color: #5a738d;
+}
+
+.success-panel {
+    background: linear-gradient(180deg, #f3f8f5 0%, #edf5ef 100%);
+    border-color: rgba(66, 131, 92, 0.18);
+}
+
+.success-label {
+    margin-bottom: 8px;
+    color: #38694a;
+    font-size: 0.78rem;
+    font-weight: 800;
+    text-transform: uppercase;
+}
+
+.success-panel h3 {
+    margin: 0 0 8px;
+    color: #12301f;
+    font-size: 1.4rem;
+}
+
+.hidden {
+    display: none;
+}
+
+@media (max-width: 640px) {
+    .app-shell {
+        padding: 24px 16px;
+    }
+
+    .login-panel {
+        padding: 28px 22px;
+        border-radius: 24px;
+    }
+}